Information
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Patent Grant
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6629661
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Patent Number
6,629,661
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Date Filed
Monday, September 30, 200222 years ago
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Date Issued
Tuesday, October 7, 200321 years ago
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Inventors
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Original Assignees
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Examiners
Agents
- Snider & Associates
- Snider; Ronald R.
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CPC
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US Classifications
Field of Search
US
- 242 528
- 242 5302
- 242 559
- 242 5593
- 242 5601
- 242 5542
- 242 5354
- 242 5643
- 242 536
- 242 560
- 242 5951
- 083 650
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International Classifications
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Abstract
A take-up reel has a diameter equal to or more than 85 times a thickness of a veneer sheet wound thereon and equal to or more than 300 mm so as to be of a curvature of the take-up reel to reduce cracking in parallel to fiber orientations that occurs in winding a veneer sheet after drying on a winding surface of the take-up reel. A veneer reeling apparatus comprises: a take-up reel disposed in a veneer sheet reeling position in a rotatable manner; a drive roller disposed on the lower surface of the take-up reel, transmitting a driving force with a variable speed; a veneer dryer disposed upstream from the veneer sheet reeling position; a conveyor provided between the terminal end of the veneer dryer and the drive-roller in the veneer sheet reeling position; and a plurality of thread feeding mechanisms disposed at arbitrary spatial intervals along a length direction of the take-up reel for a veneer sheet, wherein a continuous dried veneer sheet or dried veneer sheets whose sizes are of a constant length or of a length at random are wound on the take-up reel to form a veneer roll with threads as guide by a frictional force of the drive roller. Further, pairs of two overlapping veneer sheets or sets of a pair of two overlapping veneer sheets and a single veneer sheet can be wound on the take-up reel in a composite form.
Description
RELATED APPLICATIONS
This application claims the priority of Japanese Patent Application Nos. 11-48675 filed on Feb. 25, 1999, 11-48677 filed on Feb. 25, 1999, 11-146884 filed on May 26, 1999, 11-146885 filed on May 26, 1999, 11-206400 filed on Jul. 21, 1999, 11-206401 filed on Jul. 21, 1999, 11-308146 filed on Oct. 29, 1999, 11-361544 filed on Dec. 20, 1999, 11-361545 filed on Dec. 12, 1999, and PCT/JP00/00030 filed on Jan. 7, 2000 which are incorporated herein by reference. This application is a divisional of application Ser. No. 09/673,576 filed on Oct. 18, 2000, now U.S. Pat. No. 6,557,795.
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a take-up reel on which a veneer sheet in a damp state as cut by a veneer lathe, or a veneer sheet that has been dried from the damp state thereof by a dryer is wound, a veneer reeling apparatus that reels the veneer sheet, a tape feeding unit that feeds a tape into between veneer sheets which is reeled into a veneer roll and a veneer roll unwinding apparatus that automatically unwinds a veneer sheet from a veneer roll wound on the take-up reel to send the veneer sheet to a next step and a production method for laminated wood.
DISCLOSURE OF THE INVENTION
It is an object to provide a take-up reel on which a veneer sheet in a damp state as cut by a veneer lathe, or a veneer sheet that has been dried from the damp state thereof by a dryer is wound and a veneer reeling apparatus that winds a veneer sheet on a take-up reel in a smooth manner while preventing cracks, rifts or the like in directions of fibers of the veneer sheet from occurring. It is another object to provide a tape feeding unit that feeds a tape into between veneer sheets from a tape roll and can cut the tape at an arbitrary timing. It is still another object to provide a veneer roll unwinding apparatus that automatically unwinds a veneer sheet from a veneer roll wound on the take-up reel to send the veneer sheet to a next step.
According to findings from experiments conducted by the present inventors, when a take-up reel (a diameter of 165 mm) that has been used for reeling a veneer sheet before drying, that is a veneer sheet as cut from a log, is used for reeling a veneer sheet after drying with no special consideration, there have been many of cases where the veneer sheet after drying does not adapt itself to a small diameter of the take-up reel and as a curvature of a winding circumferential surface of a take-up reel is smaller as compared with a thickness of the veneer sheet to be wound, cracks are easier to occur in parallel to fiber directions, thereby making it impossible for the veneer sheet to be wound on the take-up reel. Especially, when there are cracks, rifts or the like generated in a veneer sheet after drying, tearing and breaking occur from such defects. The inventors have acquired a way to determine a diameter of a take-up reel on which a veneer sheet after drying is wound in connection with a thickness T of the veneer sheet based on the findings from experiments: A diameter of a take-up reel as a curvature corresponding to a thickness T of a veneer sheet is given based on a ratio of a diameter D of a take-up reel/a thickness T of a veneer sheet wound thereon and the minimum diameter of a take-up reel is set to 300 mm. According to the way to determine a diameter of a take-up reel, a veneer sheet after drying can preferably be wound on a take-up reel having a diameter equal to or more than 85 times a thickness of a veneer sheet and equal to or more than 300 mm.
According to a take-up reel of the invention, a weight of the take-up reel can be reduced and a burden of driving power can be decreased in transportation of a take-up reel, reeling a veneer sheet, storage of a veneer roll in a veneer roll stock area of a reeling deck and so on. Further, a veneer sheet on a winding circumferential surface of the take-up reel has ventilation passages, in radial direction, in communication with spaces formed in the interior of the take-up reel and openings are formed in winding supports for a veneer sheet fixed on a reel shaft to produce communication between the spaces along the reel shaft direction. With such a structure, since the winding circumferential surface of a veneer sheet of the take-up reel and the spaces formed in the interior of the take-up reel communicate with the air outside the take-up reel, ventilation is ensured. Therefore, hot air, moisture and so on included in the veneer sheet after drying is released through many of openings into the outside air and thereby, an equilibrium moisture content of each wound veneer sheet can be accelerated to reach in the storage.
In the take-up reel, flanges disposed at a spatial interval of a length corresponding to a winding width of a veneer sheet are used as winding supports for the veneer sheet and the veneer sheet is wound on the take-up reel to form a veneer roll. In such a situation, air in spaces between the flanges are released into the outside air through openings formed in the flanges and finally openings of the flanges at both outermost sides of the take-up reel. Therefore, hot air, moisture and so on, included in a veneer sheet after drying, wound on the take-up reel are released from spaces between the flanges into the outside air through openings formed in the flanges and finally openings of the flanges at both outermost sides of the take-up reel, while fresh air in the outside air flows into the interior of the take-up reel through the openings of the flanges at both outermost sides of the take-up reel.
A veneer sheet after drying is wound on the take-up reel as a pair of two overlapping veneer sheets with threads as guide to form a composite veneer roll. The composite veneer roll is prepared for combination of a face veneer sheet and a substrate veneer sheet for use in a multi-ply laminated wood and two veneer sheets are superimposed on each other while fiber orientations of the respective sheets are aligned to be the same as each other. The two overlapping veneer sheets are composed of those of different kinds or preferably composed of a face sheet and a substrate sheet, wherein the face and substrate sheets are each selected from various kinds thereof. Further, since face and substrate sheets are almost of the same in grade, two face sheets of the same kind or two substrate sheets of the same kind are sometimes combined to form two overlapping veneer sheets.
Further, pairs of two overlapping veneer sheets and single veneer sheets, both after drying, with a pair of overlapping veneer sheets and a single veneer sheet as a set, are alternately wound on the take-up reel with threads as guide to form a composite veneer roll. The composite veneer roll is prepared for use in five-ply laminated wood, and a pair of two overlapping veneer sheets and a single veneer sheet, both of the same fiber orientation, are combined as a set. The three veneer sheets composing the set can be constituted of those of different kinds from one another or preferably constituted of a face sheet, a substrate sheet and a central core sheet, wherein the face, substrate and central core sheets are each selected from various kinds thereof. Face and substrate sheets in an overlapping state as pairs and single central core sheets are alternately wound on a take-up reel. Further, since face and substrate sheets are almost the same in grade, two face sheets of the same kind or two substrate sheets of the same kind are sometimes combined to form two overlapping veneer sheets.
A veneer reeling apparatus of the invention comprises: a take-up reel installed in a veneer reeling position in a rotatable manner; a drive roller that is disposed below the take-up reel and which transmits a driving force at a variable speed; a veneer dryer installed upstream from the veneer reeling position; a connection conveyor installed between the terminal end of the veneer dryer and the drive roller in the veneer reeling position; and a plurality of thread feeding mechanisms arranged at arbitrary spatial intervals in the length direction of the take-up reel, wherein a continuous veneer sheet that has been dried in a veneer dryer can be wound on the take-up reel with threads in plural rows arranged in the length direction of the take-up reel as guide.
Further, a veneer reeling apparatus of the invention comprises: a take-up reel installed at a veneer reeling position in a rotatable manner; a drive roller that is disposed below the take-up reel and which transmits a driving force at a variable speed; a veneer dryer installed upstream from the veneer reeling position; a direction change-over conveyor installed between the terminal end of the veneer dryer and the drive roller in the veneer reeling position; and a plurality of thread feeding mechanisms arranged at arbitrary spatial intervals in the length direction of the take-up reel, wherein a non-continuous veneer sheet that has been dried in a veneer dryer can be wound on the take-up reel with threads in plural rows arranged in the length direction of the take-up reel as guide.
A winding guide member comprises: for example, endless bands in plural number of rows that each extend over three pulleys disposed at least at three points including a base end section, a middle section and a distal end section. Each endless band is connected to the distal end of a transport conveyor that transports a veneer sheet at a pulley in the base end section. Further, when the pulleys in the distal end section are swung in a direction toward a take-up reel by a following action means, the endless bands get into press contact to part of the circumferential surface of the take-up reel along the curvature thereof.
It should be appreciated that while each endless band is of a belt-like shape that extends over pulleys in the base end section and the distal end section in an endless manner, diameters of the pulleys in the base end and distal end sections are not equal to each other but the pulleys in the base end section are large in diameter as compared with the pulleys in the distal end section. Therefore, when the endless bands are pressed on the lower portion of the circumferential surface of the take-up reel, there arises a spatial margin corresponding to a difference between diameters of both pulleys in the base end and distal end sections, which makes the endless bands press the circumferential surface of the take-up reel over a surface area extending in the reel shaft direction with a width in the lower portion thereof. With such press on the surface area, more of a frictional force can be produced between the endless bands and the lower portion of the circumferential surface of the take-up reel due to increase in contact area, enabling winding of the veneer sheet on the take-up reel in a stable manner. Pairs of support arms are bent in the middle region thereof with the distal end thereof displaced toward the take-up reel, as a diameter of a veneer roll increases with progress in winding operation, the following inconveniences are avoided: such as those that the upper tracks of the endless bands get into contact and interfere with the support arms, between a lower surface and an upper surface, or the endless bands cease circulation, ensuring winding of a veneer sheet on a take-up reel.
Further, when a winding guide member is in a press contact state in conformity with the curvature of part of the circumferential surface of the take-up reel, rotary pulleys provided maintains the winding guide member in a firmly stretching condition under a constant tension by pushing or pulling the endless bands constituting the winding guide member under a pressure while guaranteeing a circulation force of the winding guide member so as to be rotatable all time. Therefore, the winding guide member can run along the curvature of the take-up reel while imparting almost the same frictional force on a veneer sheet, which enables a stable winding operation.
Especially, it is also possible that the rotary pulleys are individually provided on the endless bands in plural row constituting the winding guide member so as to individually adjust pushing or pulling the endless bands under a pressure while ensuring its circulation force. When firm stretching means are independently provided for the respective endless bands in such a way, it is possible that the endless bands of the winding guide member can individually be maintained in a firm stretching state in the same degree and thereby, a veneer sheet can receive almost the same frictional force at any points on a take-up reel along the shaft direction thereof even if there arise a deflection caused by self weight in the take-up reel or a thickness of a veneer sheet fluctuates in the course of winding operation, for example.
According to a tape feeding unit of the invention, a tape roll is blocked on its movement and controlled on its position in a tape feeding direction by forward movement stopper members on transport means and a tape unwinding from the tape roll that is under such control can be inserted into between veneer sheets that is wound on the take-up reel to form a tape roll. When a veneer sheet is wound on a take-up reel to form a veneer roll in synchronism with a speed at which the veneer sheet is cut from a log by a veneer lathe, the tape can be put in a firm stretching state between the tape roll and the veneer roll. A cutting section of a tape cutting tool is in a sliding contact with the surface of the tape in unwinding and feeding rotation of the tape roll can be stopped at a position where movement of the tape roll is blocked.
Further, a tape feeding unit for a veneer roll which feeds a tape into between veneer sheets that is wound on a take-up reel can comprises:
a vacuum chuck conveyor that guides the tape into between veneer sheets from a feed source;
a tape rack that is provided to a tape feed source, which has a plurality of tape housing rooms not only arranged in a movable manner in a direction almost at a right angle to a tape feed direction of the vacuum-chuck conveyor, but also respectively separated by partition members preventing falling of a tape roll to either of both sides and respectively having tape rolls accommodated therein that are each produced by winding a tape on a core; which is intermittently moved a distance equal to a pitch at which the tape housing rooms are arranged such that each of the tape housing rooms are sequentially located on a transport route of the vacuum-chuck conveyor; and which is operated such that when a tape housing room arrives on the transport route, it is possible that a tape is unwound from a tape roll through the front side thereof that is opened while a tape roll is rotatably supported and simultaneously prevented from falling to either of both sides by partition members; a forward movement stopper member that is disposed in an adjacent manner to the tape rack downstream therefrom on the transport route of the vacuum-chuck conveyor, which stops a tape roll, after a tape housing room of the tape rack comes to be located on the transport route of the vacuum-chuck conveyor, and a tape roll in the tape housing room then moves forward by an extreme extent at which the tape roll does not disengage from partition members, and which controls a position of the tape roll such that the tape is unwound from the tape roll at a place where the tape roll has been stopped while being rotated by the vacuum conveyor;
a tape cutting tool that protrudes from the distal end of the transport means; and
a tape roll rotation stop device that ceases rotation of the tape at a position upstream from the forward movement stopper member.
In such a way, with use of a tape rack, not only is falling of a tape roll to either of both sides prevented from occurring, but the next tape roll can be fed by moving the tape rack over a distance corresponding to a predetermined pitch of partition members when unwinding the preceding tape roll is completed. In this case, a forward movement stopper member can be provided separately and independently from the tape rack, for example, with a position thereof being fixed.
A forward movement stopper member may be one that allows unwinding of a tape roll in a sliding contact with the tape roll while preventing forward movement of the tape roll, but a stopper of a idling roller type is preferably used since the stopper is in a rolling contact with the tape roll and thereby, resistance therebetween of relative movement is minimized. Further, two idling roller stoppers can be used instead of a single idling roller stopper: for example one that is used to be in contact with a tape roll of a large diameter and the other that is used to be in contact with a tape roll of a small diameter.
Further, when winding of a veneer sheet is interrupted or terminated, rotation of a tape roll is ceased by pressing one side of the tape roll in a direction intersecting a direction of tape unwinding from the other side thereof. In this case, as means for stopping rotation of a tape roll, there are provided a receiving member that receives the one side surface of the tape roll and which is erected from a frame of a vacuum-chuck conveyor constituting of the transport means on one side thereof as viewed in a direction intersecting the tape unwinding direction at a position upstream from the forward movement stopper member and a press member connected to a cylinder mounted to the frame, wherein the press member is press-movable to the other side surface of the tape roll. Further, when winding of a veneer sheet is interrupted or terminated, rotation of a tape roll is ceased by pressing the press member to the receiving member while being in contact with the other side surface of the tape roll.
A cutting tool for cutting a tape protrudes from the distal end of the transport means, and not only has a cutting section extending in a direction intersecting the tape feed direction but can move in a direction in which the cutting tool comes into contact with the tape and the cutting section gets into a sliding contact with the tape, which is fed, by a movement mechanism. In order to attain a good sliding contact state, for example, a transport means swings about a fulcrum and thereby, the cutting section of the tape cutting tool goes from a sliding contact state to a state where the section partly presses into the surface of the tape.
While driving of a veneer lathe is ceased almost in synchronism with cease of rotation of a tape roll, a take-up reel continues inertial rotation movement at a veneer reeling position. Therefore, the tape is pulled by the veneer take-up reel that keeps its inertial rotation movement in spite of stoppage of tape unwinding from a tape roll, which causes the tape in a pulled state to be cut at the weakest position thereof, that is a position with which the cutting section of the tape cutting tool is in a sliding contact.
Further, when a tape unwound is twisted, there is a chance to cause a trouble since an adhesive surface of the tape is turned upside down. In order to prevent such a twist of the tape surface, an upside-down turn (twist) preventive member of a spatula-like member by which a twist of the tape surface is corrected or prevented from occurring can be provided at the distal end of the transport means. A tape unwound from the tape roll is pressed on the circumferential surface of a veneer roll by advancing the spatula-like member continuously at regular intervals from when the tape gets inserted into between veneer sheets to when the tape is cut. While a tape unwound from a tape roll being inserted in a normal state is sometimes turned upside down by chance in the course of operation and inserted into between veneer sheets in a wrong state, the twist phenomena can be prevented from occurring by adoption of the twist preventive member.
In a veneer roll unwinding apparatus of the invention, drive guide bands are constituted of endless bands such as belts that extend over a plurality of base end pulleys fixedly mounted on a support shaft located below a unwinding position in the shaft direction thereof at arbitrary spatial intervals and as many distal end pulleys as the number of the base end pulleys, wherein the distal ends at which the distal end pulleys are mounted are free. The distal end pulleys are swingable with the support shaft as a fulcrum and the drive guide bands are moved to or away from the lower portion of the circumferential surface of a veneer roll formed by winding a veneer sheet on a take-up reel which is rotatably disposed at the unwinding position.
Further, relay pulleys whose diameters are larger than those of the base end pulleys are rotatably mounted on a shaft on which the base end pulleys are fixedly mounted in the fold-back side of the drive guide bands, that is in the base end pulley side where a veneer sheet is folded back and turned upside down. It is preferable that the a plurality of relay pulleys are in a freely idling manner disposed on the shaft on which the base end pulleys are fixedly mounted while arranged in lateral direction together with the base end pulleys and a fold-back guide member is provided on the opposite side to the relay pulleys in the fold-back section. The fold-back guide member is preferably constructed of: a frame with an opposite surface to the relay pulleys which surface has a profile of an arc extended along the curvature of the relay pulleys; a plurality of pulleys that are supported on the frame; and endless bands extending over the pulleys. The endless bands extending over the pulleys respectively correspond to the relay pulleys in number and disposed in positions opposite to the positions where the relay pulleys are located, and in sliding contact with the outer circumferential surface of a veneer sheet fold-back side of the relay pulleys.
The endless bands circulates at almost the same speed as that of a transport speed of a veneer sheet transported on the drive guide bands to a fold-back direction. When the drive guide bands circulate in contact with the lower portion of circumferential surface of a veneer roll while swinging with a support shaft as a fulcrum the veneer sheet is unwound by a frictional force of the drive guide bands acting on a veneer roll. The unwound veneer sheet is then transported on the drive guide bands and reach the fold-back section thereof, and then is transferred to the relay pulleys from the drive guide bands. The transferred veneer sheet is folded back by receiving a driving force of the endless bands of the fold-back member while being pinched between the relay pulleys and the endless bands, with the result that the veneer sheet is turned upside down.
In such a way, since a transport speed of the drive guide bands and a fold-back speed at which a veneer sheet is folded back while being pinched between the endless bands constituting the fold-back member and the pulleys in the fold-back section are controlled to be almost the same as each other, there is no chance that a veneer sheet is stretched in a direction perpendicular to fiber orientations of the veneer sheet in company with control of a circumferential speed as described above. Therefore, there arises no excessive concentration of tension at a starting position in unwinding of a veneer sheet when a veneer sheet is unwound from a veneer roll by means of the drive guide bands, thereby preventing breaking and tearing in fiber orientations of a veneer sheet at the starting position in unwinding from occurring.
Further, in a veneer roll unwinding apparatus as described above, a plurality of thread reels are provided in downstream positions from the unwinding position while a travel member is provided in a freely reciprocating manner to or away from the plurality of thread reels with a backward movement limit thereof in an upstream side from the unwinding position. On the travel member, not only there are provided a plurality of grasping members that grasp the terminal ends, which are free fore-ends, of threads that hang down from a veneer roll, wherein the threads are wound on the veneer roll in plural row along the length direction thereof as guide for a veneer sheet, but the grasping members can respectively be provided with nozzles that communicate with an air duct. With such a configuration, the free ends of the threads can be grasped when the travel member advances and the threads are wound on the thread reels by air streams from the nozzles at the travel member forward movement limit. A veneer sheet is unwound by pressing the drive guide bands to part of the circumferential surface of a veneer roll while the threads continues to be wound by the air streams.
Further, in the veneer roll unwinding apparatus, the following configuration can also be adopted: A frame on which a plurality of thread reels are disposed is provided in a downstream side from the unwinding position in a freely reciprocating manner to or away from the unwinding position, wherein the thread reels are disposed at positions on the frame corresponding to threads, which are wound on a veneer roll as guide for a veneer sheet in plural rows along the length direction of the veneer roll, and whose free ends hang down from a veneer roll, and suction holes that communicate with an exhaust duct are respectively formed at winding portions of the thread reels at which threads begin to be wound. In the configuration, the threads are wound on the thread reels by an exhaust stream to the exhaust holes when the frame is positioned at the forward movement limit, thereafter the frame return to its original position and then, a veneer sheet can be unwound from a veneer roll with the drive guide bands in press contact with part of the circumferential surface of the veneer roll while threads continue to be wound on the thread reels.
Further, in the veneer roll unwinding apparatus, the following configuration can also be adopted: A pair of unwinding rollers are disposed at positions downstream from the unwinding position such that both or one of the unwinding rollers can freely be moved to or away from each other, or the other, and the unwinding rollers work for unwinding threads at the positions corresponding to the threads, which are wound on a veneer roll as guide for a veneer sheet in plural rows along the length direction of the veneer roll, and whose free ends hang down from a veneer roll. In the configuration, a veneer sheet can be unwound from a veneer roll with the drive guide bands in press contact with part of the circumferential surface of the veneer roll while the pair of unwinding rollers take up and pinch free ends of threads therebetween by moving to each other and unwind the threads. In this case, it is preferable that one of the pair of unwinding rollers is of a single cylinder, while the other is replaced with a plurality of unwinding rollers on a common axial line each with a same diameter cylinder, wherein the single unwinding roller and the plurality of unwinding rollers can freely be moved to or away from each other.
It should be appreciated that it is preferable that in the drive guide bands, a diameter of base end pulleys is larger than that of distal end pulleys, and pairs of support arms that respectively support the distal end pulleys are each bent in the middle region with the distal end thereof displaced upward.
In unwinding a veneer sheet from a veneer roll in which unwinding assist members constituted of long flexible members are reeled together with a veneer sheet, when a position from which a veneer sheet begins to be unwound from the circumferential surface of the veneer roll is called a veneer sheet separating position and a veneer sheet separation opposite position is set at an opposite point on the circumferential surface of the veneer roll from the veneer sheet separating point, on the other side of the central axial line of the veneer roll from the veneer sheet separating point, a direction along which the unwinding assist members are pulled out from the veneer roll can be determined between the veneer sheet separating position and the veneer sheet separation opposite position in the veneer sheet unwinding side. In the veneer sheet unwinding side formed between the veneer sheet separating position, from which a veneer sheet begins to be unwound from the circumferential surface of the veneer roll, and the veneer sheet separation opposite position, at which a line from the veneer sheet separating position through the center of the veneer roll intersects the circumference of the veneer roll, a direction along which the unwinding assist members, for example the threads, are pulled out from the veneer roll is determined in a space between the veneer sheet separating position and the veneer sheet separation opposite position. It is important that the pulling direction is determined such that when a veneer sheet unwound from the veneer roll tends to be wound on the veneer roll in accompanying manner, the pulling direction works so as to prevent accompanying phenomena of a veneer sheet with the veneer roll from occurring and to be effective for bringing the veneer sheet to the transport surface. That is, when a thread is pulled toward almost directly above along the curvature of the veneer roll or in a direction inclined from the directly above toward the other side from the veneer sheet unwinding side, it is hard to block the accompanying action of a veneer sheet by a thread. Therefore, it is preferable that an angle formed between a line that connects the center of the veneer roll and the veneer sheet separating position and a line that connects the center and a separating point of a thread is less than 90 degrees and a thread is pulled out from the veneer roll with an angle in the range.
A thread support device is located at an outward position radially spaced apart from the circumferential surface of a veneer roll and thread auxiliary pulleys are rotatably mounted on a support shaft thereof disposed in parallel to the central axial of the veneer roll. When threads that are wound on the veneer roll along the curvature are protruded from the veneer roll outwardly, the threads are recovered by supporting on the thread auxiliary pulleys so as to minimize a loss of the threads, wherein the threads are received into a recovery box or onto thread reels in a firmly stretching state of the threads. Further, in supporting the thread auxiliary pulleys, if the thread auxiliary pulleys are rotatably mounted on the fore-ends of protruded arms that protrude from the support shaft, the threads can be supported by the thread auxiliary pulleys with ease.
The support shaft of the thread support device is supported by one ends of arm rods at both ends of the support shaft and one of rotary shafts attached to the other end of the arm rod is mounted to a piston rod of a fluid cylinder. The rotary shaft is swung through an angle by extending or contracting the piston rod, thereby enabling displacement of a position of the support shaft outwardly spaced from the veneer roll along the circumference of the veneer roll. With such a configuration to enable the displacement, the threads are positioned in a protruding manner while being spaced from the veneer sheet unwinding surface of the veneer roll and in addition, in a case where the protruding position is not so much effective for blocking the threads tending to be wound accompanying the circumferential surface of the veneer roll, the position at which the threads are supported spaced outwardly while swinging the rotary shaft is displaced to a position of the support shaft with which the veneer sheets that tends to be wound on the veneer roll are effectively blocked from accompanying the circumferential surface thereof, that is the support shaft is displaced to a position closer to the veneer sheet unwinding surface.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1
is a schematic side view showing reeling a veneer sheet in a continuous state after drying;
FIG. 2
is an enlarged view for illustration showing a way that threads are wound on a take-up reel;
FIG. 3
is a schematic plan view showing reeling veneer sheets in a non-continuous state after drying;
FIG. 4
is a schematic enlarged view for illustration showing a way that veneer sheets in a non-continuous state after drying are reeled;
FIG. 5
is a block diagram of interval narrowing means;
FIG. 6
is an enlarged view for illustration showing a winding state while narrowing spatial intervals between veneer sheets in a non-continuous state after drying;
FIG. 7
is a block diagram showing another embodiment of the interval narrowing means;
FIG. 8
is a perspective view showing another embodiment of the take-up reel;
FIG. 9
is a perspective view showing another embodiment of the take-up reel;
FIG. 10
is a sectional view taken on the shaft direction of the take-up reel shown in
FIG. 8
;
FIG. 11
is a sectional view taken on line A—A of
FIG. 10
in an arrow direction;
FIG. 12
is a sectional view taken on the shaft direction of the take-up reel shown in
FIG. 9
;
FIG. 13
is a side view of an embodiment in which a veneer roll that has been obtained by reeling a dried veneer sheet is unwound to combine and form a composite veneer roll;
FIG. 14
is a plan view of
FIG. 13
;
FIG. 15
is a block diagram illustrating interval narrowing means;
FIG. 16
is a schematic view for illustration of a composite veneer roll after narrowing spatial intervals;
FIG. 17
is a block diagram illustrating another embodiment of the interval narrowing means;
FIG. 18
is a side view of an embodiment in which two veneer rolls that have been obtained by reeling dried veneer sheets are unwound to combine and form a composite veneer roll;
FIG. 19
is a schematic view for illustration of another composite veneer roll;
FIG. 20
is a schematic view for illustration of another composite veneer roll after narrowing spatial interval;
FIG. 21
is a side view of an embodiment in which three veneer roll that have been obtained by reeling dried veneer sheets are unwound to laminate and form a composite veneer roll;
FIG. 22
is a block diagram illustrating interval narrowing means for another composite veneer roll;
FIG. 23
is a block diagram illustrating another interval narrowing means for another composite veneer roll;
FIG. 24
is a plan view of an embodiment to form a composite veneer roll from veneer sheets fed from piles of veneer sheets after drying;
FIG. 25
is a sectional view taken on line B—B of
FIG. 24
in an arrow direction;
FIG. 26
is a partly cut-away side view of
FIG. 24
;
FIG. 27
is a partly cut-away plan view showing an embodiment of a veneer reeling apparatus;
FIG. 28
is a partly cut-away plan of
FIG. 27
;
FIG. 29
is a side view showing an embodiment of a veneer reeling apparatus;
FIG. 30
is a view for illustration of a working state of
FIG. 29
;
FIG. 31
is a schematic view for illustrations showing another embodiment of a veneer reeling apparatus;
FIG. 32
is a side view showing another embodiment of
FIG. 29
;
FIG. 33
is a block diagram of interval narrowing means;
FIG. 34
is a side view conceptually showing a tape feeding unit;
FIG. 35
is a perspective view showing a way of tape feeding;
FIG. 36
is a further detailed side view showing the tape feeding unit of
FIG. 34
;
FIG. 37
is a side view showing
FIG. 36
including peripheral structures thereof;
FIG. 38
is a plan view of
FIG. 36
;
FIG. 39
is a side view showing a tape feeding unit singly in which the base frame of
FIG. 36
is omitted.
FIG. 40
is a plan view of
FIG. 39
, in which a tape rack is omitted;
FIG. 41
is a conceptual perspective view of a tape rack and a tape roll rotation stop device;
FIG. 42
is a plan view of
FIG. 41
, in which a tape roll rotation stop device is omitted;
FIG. 43
is a view for illustration showing feeding of a tape roll onto a conveyor and a forward movement roller stopper;
FIG. 44
is a plan view showing an example of a core discharge unit;
FIG. 45
is a plan view showing a state where a door is open;
FIG. 46
is a view for illustration showing discharge action of a core;
FIG. 47
is a side view showing an example of a tape twist preventive mechanism at the distal end of a conveyor;
FIG. 48
is a view for illustration of action of the tape twist preventive mechanism;
FIG. 49
is a plan view of the tape twist preventive mechanism;
FIG. 50
is a view for illustration of a state where a twist of a tape is corrected;
FIG. 51
is a conceptual plan view of a tape rack and a tape rotation stop device;
FIG. 52
is a view for illustration of action where rotation of a tape roll is ceased;
FIG. 53
is a conceptual side view of a tape rotation stop device;
FIG. 54
is a conceptual plan view showing another embodiment of a tape rotation stop device;
FIG. 55
is a conceptual plan view showing another embodiment of a tape rotation stop device;
FIG. 56
is a perspective view conceptually showing a tape cutting unit:
FIG. 57
is a view for illustration of action of a mechanism that gives an increased tension to a tape in tape cutting;
FIG. 58
is a bottom view showing another embodiment of a tape cutting unit at the distal end of a conveyor;
FIG. 59
is a perspective view conceptually showing the tape cutting unit of
FIG. 58
;
FIG. 60
is a view for illustration of action of a mechanism that gives a tension to a tape in tape cutting;
FIG. 61
is a view for illustration of action in tape cutting by a cutter;
FIG. 62
is a plan view showing an example of a tape cutting unit different from
FIGS. 59 and 60
;
FIG. 63
is a plan view showing an example of a tape cutting unit different from
FIG. 62
;
FIG. 64
is a side view showing an embodiment of unwinding of a veneer sheet from a veneer roll;
FIG. 65
is a plan view of
FIG. 64
;
FIG. 66
is a side view showing another embodiment of unwinding of a veneer sheet from a veneer roll;
FIG. 67
is a plan view of
FIG. 66
;
FIG. 68
is a side view showing another embodiment of unwinding of a veneer sheet from a veneer roll;
FIG. 69
is a side view showing another embodiment of folding-back of a veneer sheet;
FIG. 70
is a side view showing an embodiment of a thread recovery unit;
FIG. 71
is a plan view of
FIG. 70
;
FIG. 72
is a plan view showing another embodiment of a thread recovery unit;
FIG. 73
is a partly cut-away perspective view of
FIG. 72
;
FIG. 74
is a plan view showing another embodiment of a thread recovery unit;
FIG. 75
is a sectional view taken on line C—C of
FIG. 74
in an arrow direction;
FIG. 76
is a perspective view showing an embodiment of a thread position correcting device;
FIG. 77
is a rear view of a correcting member;
FIG. 78
is a perspective view of another embodiment of a thread position correcting device;
FIG. 79
is a plan view showing another embodiment of a thread position correcting device;
FIG. 80
is a side view showing anther embodiment of a thread reel;
FIG. 81
is a perspective view showing another embodiment of a thread reel;
FIG. 82
is a perspective view showing another embodiment of a thread guide;
FIG. 83
is a side view showing another embodiment of unwinding of a veneer sheet from a veneer roll;
FIG. 84
is a view for illustration of blocking action for accompaniment of a veneer sheet in unwinding;
FIG. 85
is a view for illustration of blocking action for accompaniment of a veneer sheet in unwinding;
FIG. 86
is a schematic partly cut-away perspective view showing blocking of accompaniment of a veneer sheet in unwinding;
FIG. 87
is a plan view showing another rotating means of a rotary shaft shown in
FIG. 86
;
FIG. 88
is a plan view showing another rotating means of a rotary shaft shown in
FIG. 86
; and
FIG. 89
is a view for illustration of a principle of blocking action for accompaniment of a veneer sheet in unwinding.
BEST MODE FOR CARRYING OUT THE INVENTION
Description will be made of an embodiment of a veneer reeling apparatus of the invention with reference to the accompanying drawings below.
In
FIG. 1
, there is shown an embodiment in which a veneer sheet
1
after drying in a continuous state is reeled. In this case, a veneer dryer
2
includes a transport system configured as follows: two metal mesh bands
3
are provided one above the other with a gap therebetween as a transport route and each extend over two pulleys disposed spaced from each other along a transport direction, wherein the metal mesh belts
3
are respectively circulated in opposite directions to transport a veneer sheet in a continuous state. Further, a continuous veneer sheet
1
is dried by a circulated hot air blown from upper air vents of the veneer dryer in transportation and, at the exit of the dryer
2
, transferred to a connection conveyor
4
abutted by an end of a metal mesh band
3
. Further, the connection conveyor
4
is provided with a pulse generator and a detector that senses the veneer sheet after drying transported thereon, which will be detailed later.
A veneer sheet reeling position
5
where a continuous veneer sheet
1
is reeled is located at a position downstream from the connection conveyor
4
. A drive roller
6
is supported with bearings, the top of the drive roller
6
is at a height almost equal to that of the transport surface of the connection conveyor
4
and the length direction thereof at least intersects a transport direction of the veneer sheet
1
. While a speed of the drive roller
6
can be variable, the drive roller
6
is normally operated at a speed almost same as that of the connection conveyor
4
. A take-up reel
7
whose diameter is large is rotatably supported by a reel receiver
8
with bearings at both ends of the take-up reel
7
. The take-up reel
7
is on the drive roller
6
while the lower surface of the take-up reel
7
is kept in contact with the upper surface of the drive roller
6
and the take-up reel
7
is thereby rotated in a counterclockwise direction as viewed in
FIG. 1
by a frictional force produced from a driving force of the drive roller
6
, following the drive roller
6
.
After the continuous veneer sheet
1
is dried in the veneer dryer
2
, the sheet
1
is transported on the connection conveyor
4
to reach the veneer reeling position
5
. When the continuous veneer sheet
1
arrives at between the drive roller
6
and the take-up reel
7
, the take-up reel
7
is in an opposite direction rotated by a frictional force produced from a driving force of the drive roller
6
to take-up the continuous veneer sheet
1
thereon, while the drive roller
6
rotates at almost the same speed as that of the connection conveyor
4
. In such a way, the continuous veneer sheet
1
is wound on the take-up reel
7
in a sequential manner. While since the veneer sheet
1
is continuous, it can normally be wound on the take-up reel
7
by a frictional force produced from a driving force of the drive roller
6
with no other special means applied, there sometimes arise breaks with ease due to cracks, rifts or the like produced after a drying operation, or in anther case, relaxation of a veneer roll in the middle portion thereof. To cope with such adverse situations, a plurality of thread feeding mechanisms
10
are provided in a case, as a countermeasure, to the take-up reel
7
at arbitrary spatial intervals in a length direction of the take-up reel
7
. In this case, the threads
12
are fed from thread reels
11
of the thread feeding mechanisms
10
, the tips of the threads
12
are first wound on the take-up reel
7
at arbitrary spatial intervals along a length direction thereof and thereafter the threads are respectively wound together with the continuous veneer sheet
1
as guides at plural positions on the take-up reel
7
.
To be concrete, a way that the threads
12
are wound on the take-up reel
7
is shown in FIG.
2
. That is, the take-up reel
7
has highly frictional regions at arbitrary spatial intervals along a length direction thereof on the circumferential surface thereof, such as made from sand papers, fine protrusions or the like with which the threads
12
becomes entangled. A plurality of nozzles for use in feeding the threads are provided to the take-up reel
7
in a position downstream therefrom such that the nozzles can freely be located between upper positions spaced apart from the outer surface of the take-up reel
7
and lower positions by means of, for example, guide rails curved like an arc (not shown) or a mechanism, freely movable, forward or backward, and upward or downward (not shown). The drive roller
6
has grooves
6
M at a plurality of positions at arbitrary spatial intervals in a shaft direction and the fore-ends of the nozzles are accommodated in the grooves
6
M. The tips of the threads
12
fed from the thread reel
11
are carried on a stream blown to the highly frictional regions of the take-up reel
7
through the nozzles
12
N locating at the upper positions so as to become entangled with the highly frictional regions of the take-up reel
7
. Thereafter, the nozzles
12
N are moved downward to reach the respective grooves
6
M on the drive roller
6
. At this point, the nozzles
12
N are located lower than the upper surface of the drive roller
6
and the threads
12
are in a firmly stretched state between sites where the threads
12
are entangled with on the take-up reel
7
and the nozzles
12
N. Hence, when the veneer sheet
1
is wound on the take-up reel
7
by a frictional force produced from a driving force of the drive roller
6
, the threads
12
work as a guide and are wound together with the veneer sheet
1
thereon at a plurality of sites on the veneer sheet
1
.
In this situation, when the reel receiver
8
that supports the take-up reel
7
with bearings is fixedly positioned, the connection conveyor
4
and the drive roller
6
are freely swung downward with the starting end of the connection conveyor
4
as a fulcrum and as a winding diameter of a veneer roll increases, the drive roller
6
is pivotally lowered in an automatic manner together with the connection conveyor
4
by a half of the increase in diameter. Contrary to this, when bearings of the drive roller
6
are fixedly positioned, the reel receiver
8
of the take-up reel
7
is raised by a half of the increase in diameter of the take-up reel. Further, since the drive roller
6
imparts a frictional force to the take-up reel
7
, a fluid pressure, a balance weight or the like is employed in order to maintain a state in which the drive roller
6
is in press contact with the take-up reel
7
under a constant pressure all the time.
Further, while a veneer sheet
1
after drying is wound on the take-up reel
7
, it has been impossible to use a take-up reel of a diameter 165 mm for a veneer sheet
1
after drying without any special means applied, which take-up reel has traditionally been for use in reeling a green veneer sheet as cut from a log. That is, when a veneer sheet
1
after drying is wound on a reel of the diameter of 165 mm, the veneer sheet
1
frequently is not adapted to a the small diameter and generates cracks in sites in parallel to fiber orientations with ease, thus making it impossible to winding the veneer sheet
1
on the take-up reel
7
. Especially, when there remain cracks and rifts as produced after drying in a veneer sheet
1
, breaking or tearing gets started from such defective sites. The inventors have acquired a diameter equivalent to a curvature of a take-up reel
7
that corresponds to a thickness of a veneer sheet
1
after drying wound thereon based on findings as results of experiments wherein the diameter of a take-up reel
7
is limited as a value equal to or more than 300 mm while the diameter is designated using a parameter for determining the diameter=a diameter of a take-up reel
7
/a thickness T of a veneer sheet wound on the take-up reel. According to this method for determining a diameter of a take-up reel, a dried veneer sheet
1
can be wound on a take-up reel
7
in a good condition by setting a diameter of the take-up reel
7
such that a diameter of the take-up reel
7
is equal to or larger than not only 85 times a thickness T of a veneer sheet
1
but 300 mm. For example, if a thickness of a veneer sheet
1
is 2 mm, a diameter D of a take-up reel
7
would be set to 170 mm, but since this value is less than 300 mm, the diameter of a take-up reel
7
is eventually set to a value equal to or larger than 300 mm. In this embodiment, a diameter of the take-up reel
7
was set to 450 mm and thereby, a good result was obtained in winding a veneer sheet
1
after drying.
In
FIG. 3
, there is shown an embodiment in which veneer sheets
1
whose sizes are of a constant length or of a length at random (, in the latter case, the veneer sheets
1
having random sizes and are non-continuous) are wound on a take-up reel after drying. In this case, transport routes in stages of a veneer dryer
2
are constructed of a plural pairs of feed rollers
13
, one above the other, disposed at positions along a length direction thereof, wherein the plural pairs of rollers send a veneer sheet
1
by pressing the veneer sheet
1
from both sides in a thickness direction of the veneer sheet
1
and rotating. The veneer sheets
1
are sent simultaneously in plural number as a set (three sheets in the figure) being arranged with a length direction in parallel to a fiber orientation and in a direction perpendicular to a transport direction. The veneer sheets
1
are dried by circulating hot air from upper vents in the veneer dryer
2
in the course of transportation and transferred to a direction change-over conveyor
14
that changes a moving direction of the transportation by an almost right angle at the exit of the veneer dryer
2
.
A veneer sheet reeling position
5
is located in a position downstream from the direction change-over conveyor
14
, in which position the veneer sheet
1
is wound on a take-up reel. In the veneer sheet reeling position
5
, there are provided with a drive roller
6
, the take-up reel
7
whose diameter is large, and thread feed mechanisms
10
that are disposed in a length direction of the take-up reel
7
at arbitrary spatial intervals in plural number, all similar to the above described.
After the veneer sheet
1
is dried in the veneer dryer
2
, it is transferred to the direction change-over conveyor
14
from the transport route in a state in which a transport direction is changed over by a right angle. Hence, the veneer sheet
1
is thereafter transported in a state in which a fiber orientation intersects the new transport direction and reaches the veneer sheet reeling position
5
. Then, winding of the veneer sheets
1
get started and threads
12
fed from thread reels
11
of the thread feed mechanisms
10
are blown through nozzles
12
N as described above and wound over a plurality of sites located along a length direction of the take-up reel
7
at arbitrary spatial intervals such that tips of the threads
12
are entangled with the plurality of sites. Then when the veneer sheets
1
arrive at between a drive roller
6
and the take-up reel
7
, the take-up reel
7
is rotated in an opposite direction from the drive roller
6
by a frictional force produced from a driving force thereof, wherein the drive roller
6
rotates at almost the same speed as a circulation speed of the direction change-over conveyor
14
and thereby, the veneer sheets
1
are wound on the take-up reel
7
with the threads
12
as guides at the plurality of sites thereon. The veneer sheets
1
fed from the direction change-over conveyor
14
are sequentially wound on the take-up reel
7
as shown in FIG.
4
and at the case, spatial intervals between the veneer sheets
1
arranged end to end in a transport direction are narrowed under consideration of winding efficiency.
Such interval narrowing means will be described with reference to
FIG. 5. A
detector
15
is placed above the direction change-over conveyor
14
and as a detector, a contact type, or a non-contact type such as a transparency type, a reflection type or the like may be employed. When the detector
15
senses the leading edge of a veneer sheet
1
, it transmits a detection instruction to a drive controller
16
that is a control system of the drive roller
6
. A distance setter
17
that sets a distance K from the detector
15
to the drive roller
6
is connected to the drive controller
16
and the drive controller
16
stops the drive roller
6
in response to the detection instruction. A pulse generator
19
is provided to the direction change-over conveyor
14
and thereby, a distance K over which a veneer sheet
1
is carried on the direction change-over conveyor
14
is detected by counting up of the number of pulses. A veneer sheet
1
that has arrived on the drive roller
6
is moved over a length of the veneer sheet
1
by the drive roller
6
and thereby is wound on the take-up reel
7
with the threads
12
as a guide. A length of a veneer sheet
1
is determined by the detector
15
through detecting the leading and trailing end of the veneer sheet
1
in transportation of the veneer sheet
1
on the direction change-over conveyor
14
and stored in the drive controller
16
as the number of pulses. It should be appreciated that when a length of a veneer sheet
1
is cut constant, the constant length may be stored in the drive controller
16
as a length of a veneer sheet in advance.
When the leading edge of a next veneer sheet
1
is detected by the detector
15
, the veneer sheet
1
comes onto the drive roller
6
after steps similar to the above described and the veneer sheet
1
is wound on the take-up reel
7
with the threads
12
as a guide while a gap between the veneer sheet wound previously and the veneer sheet in consideration are narrowed. By repetitions of the above described operations, the drive roller
6
intermittently rotates and veneer sheets
1
are efficiently wound on the take-up reel
7
with narrowed intervals.
Since the interval narrowing means shown in
FIG. 5
winds a veneer sheet
1
on the take-up reel
7
by intermittently rotating the drive roller
6
at the veneer sheet reeling position
5
, when a transport speed of the conveyor and an average speed of intermittent winding (slow speed) correspond to each other, no trouble arises in reeling. However, if a winding speed is intended to be higher, a trouble arises. In this case, adjustment of spatial intervals of veneer sheets
1
is performed during transportation at a stage prior to the veneer sheet reeling position
5
. Then, another embodiment of the interval narrowing means will be described with reference to
FIG. 7
, wherein the same constituents as those corresponding of
FIG. 5
are indicated by the same marks. At first, the starting end of an interval narrowing conveyor
18
that performs narrowing spatial intervals between veneer sheets
1
arranged along a transportation direction is disposed in a staggered manner with the terminal end of the direction change-over conveyor
14
, wherein both conveyors
14
and
18
can independently be driven. In this situation, when a detector
15
disposed above the direction change-over conveyor
14
detects the leading edge of a veneer sheet
1
, the detector
15
transmits a detection instruction to a drive controller
16
that is a control system of the interval narrowing conveyor
18
. A distance setter
17
in which a distance K from the detector
15
to a point on the interval narrowing conveyor
18
is set is connected to the drive controller
16
and driving of the interval narrowing conveyor
18
is stopped in response to the detection instruction. A pulse generator is provided to the direction change-over conveyor
14
, a veneer sheet
1
is carried on the direction change-over conveyor
14
over a distance K and transportation over the distance K is detected by counting up of the number of pulses. A veneer sheet
1
having arrived on the interval narrowing conveyor
18
is driven by a length of the veneer sheet
1
. A length of a veneer sheet
1
is determined by the detector
15
through detecting the leading and trailing end of the veneer sheet
1
in transportation of the veneer sheet
1
on the direction change-over conveyor
14
and stored in the drive controller
16
as the number of pulses. It should be appreciated that since a length of a veneer sheet
1
is cut constant, the constant length may be stored in the drive controller
16
as the length of a veneer sheet
1
in advance. With this intermittent driving, veneer sheets
1
are rearranged such that spatial intervals end to end of the veneer sheets
1
along the transport direction are smaller on the interval narrowing conveyor
18
. Then, the veneer sheets
1
are transferred to another conveyor whose speed coincides with a winding speed, followed by winding on a take-up reel
7
at the speed.
A veneer roll
9
obtained by winding a veneer sheet or sheets
1
after drying on a large diameter take-up reel
7
are stored in a veneer roll stock area of a reeling deck for a time period such that each veneer roll comes to have an equilibrium moisture content.
It is appreciated that the take-up reel
7
is a cylinder with a shaft
7
G as a center of rotation and a closed space is normally formed in the interior of the cylinder with a welded structure. Especially, since the take-up reel
7
has a large diameter (equal to or larger than 300 mm and in the embodiment, a diameter of 450 mm) as compared with a take-up reel (of a diameter of 165 mm) that has been employed in reeling a green veneer sheet as cut from a log, a weight of a take-up reel itself is increased and thereby, requirement for driving power is increased in transportation of a take-up reel
7
, winding a veneer sheet or sheets
1
, storage in a veneer roll stock area of a reeling deck and so on, and mechanical reinforcement is also necessary for related structures such as the reeling deck.
In order to cope with such requirements, other structures of a take-up reel of the invention are shown in
FIGS. 8 and 9
. That is, A large diameter take-up reel
7
shown in
FIG. 8
has an outer surface portion where many of openings
7
K each having a slit-like shape and a large diameter take-up reel
7
shown in
FIG. 9
has a plurality of flanges
7
T each of the same large diameter as one another mounted on a reel shat
7
G at arbitrary spatial intervals along the shaft direction, wherein a surface portion of each flange
7
T has a opening
7
K according to a need.
In
FIG. 10
, there is shown a section taken along a shaft direction of the take-up reel
7
shown in FIG.
8
. That is, disc reinforcement plates
7
H are fixed on the reel shaft
7
G along the direction of the reel shaft
7
G at predetermined spatial intervals by means of welding or the like. A flat plate
7
I is fixed in a winding manner on the outer peripheries of the reinforcement plates
7
H by means of welding or the like, wherein the flat plate
7
I has a width several times as large as a thickness of a reinforcement plate
7
H, thereby forming so-called a flange
7
T. The flanges
7
T all have the same outer diameter as one another and a shell plate
7
D that constitutes a body portion of the take-up reel
7
and on which a veneer sheet or sheets
1
are wound is fixed along the curvature of the circumferences of the flanges
7
T by means of welding or the like.
Openings
7
K are radially formed in each flange
7
T in a plurality of sites as shown in FIG.
11
and Openings
7
K are also formed on the shell plate
7
D as shown in FIG.
8
. Therefore, the interior of a take-up reel
7
and the outside air in communication with each other and a great lot of air can flow into the interior of the take-up reel
7
through the openings
7
K.,
7
K respectively formed in the flanges
7
T and the shell plate
7
D and in a reverse way, air in the interior of the take-up reel
7
, that is air in spaces formed between the flanges
7
T, can flow out to the outside through the openings
7
K,
7
K respectively of the flanges
7
T and the shell plate
7
D. It should be appreciated that while in the embodiment, the openings
7
K each are in the shape of a slit, there is no specific limitation to this shape but any shape such as a circle, an ellipse and a polygon can be adopted as far as an opening can be formed with it.
In
FIG. 12
, there is shown a section taken along a shaft direction of a take-up reel
7
shown in FIG.
9
. That is, the take-up reel
7
has flanges
7
T that are fixed on a shaft
7
G at predetermined spatial intervals along the shaft direction by means of welding of the like and a plurality of openings
7
K are formed in each flange
7
T and the outer peripheries of the flanges
7
T constitute a body portion of the reel. In this case, fiber orientations of a reeled veneer sheet
1
is in parallel to a direction of a winding width
1
W and since the veneer sheet
1
has a mechanical strength to some extent in the fiber orientations, a winding support for the veneer sheet
1
can be constituted of the outer peripheries of the flanges
7
T. In this take-up reel
7
, the flanges
7
T arranged in the spatial interval corresponding to the winding width
1
W serve as winding supports for the veneer sheet
1
and the veneer sheet
1
is wound on the take-up reel
7
to form a veneer roll
9
. In this structure, air in the spaces between the flanges
7
T are released to the outside through the openings
7
K located on both sides of each space.
Therefore, according to the take-up reels
7
, a weight of a reel is decreased and furthermore, requirement for driving power, mechanical reinforcement and so on that are described above can be eliminated. Further, in a case where a veneer sheet
1
is wound on a large diameter take-up reel
7
, since the interior of the take-up reel
7
is in communication with the outside air through many of openings
7
K formed in the take-up reel
7
, ventilation in the interior is ensured through the openings
7
K. That is, according to a take-up reel
7
shown in
FIGS. 8
,
10
and
11
, even if moisture, hot gas and so on included in a veneer sheet
1
after drying flow into the interior of a take-up reel
7
through openings
7
K formed in the shell plate
7
D, the moisture and so on are released by ventilation through the openings
7
K of the flanges
7
T in the interior of the reel
7
and the openings
7
K formed in the flanges
7
T at both outermost sides of the take-up reel
7
, or through openings
7
K in the shell plate
7
D on which a veneer sheet
1
is not wound, into the outside air. On the other hand, fresh air in the outside air flows into the interior of the take-up reel
7
through the openings of the flanges
7
T at the both outermost sides of the reel
7
or the openings K in the shell plate
7
D on which the veneer sheet
1
is not wound and the flow-in air is put in contact with the veneer sheet
1
that has been wound on the reel
7
by ventilation through the openings of the flanges
7
T in the interior of the reel
7
and then the openings
7
K of the shell plate
7
D. Therefore, hot air, moisture and so on included in the veneer sheet
1
after drying are not retained in the interior of the take-up reel
7
but can always be replaced with fresh air from the outside.
Further, according to a take-up reel
7
shown in
FIGS. 9 and 12
, hot air, moisture and so on included in a dried veneer sheet
1
are released into the outside air through the openings
7
K from spaces between the flanges
7
T and further the openings
7
K at the outermost both side flanges
7
T, while fresh air from the outside air flows into the interior of a take-up reel
7
through the openings
7
K of the flanges
7
T. In such a way, a veneer sheet
1
that has been wound on a take-up reel
7
to form a veneer roll
9
is stored in a veneer roll stock area of a reeling deck for a time period and an equilibrium moisture content of each veneer roll can be accelerated to reach in the storage.
It should be appreciated that while in the embodiment, description is made such that a flange
7
T is obtained by fixing a flat plate
7
I of a width as large as several times a thickness of a disc reinforcement plate
7
H along the outer peripheries thereof in a winding manner by means welding or the like, the flange
7
T can be a disc plate itself with no flat plate
7
I interposed between disc reinforcement plates
7
H.
Then, description will be made of a case where a veneer roll that has been obtained by reeling a dried veneer sheet is unwound to combine and form a composite veneer roll with reference to
FIGS. 13 and 14
. A veneer roll
9
that has been obtained by reeling a veneer sheet
1
after drying is rotatably supported on a reel receiver
8
with bearings at both sides of a take-up reel
7
in a veneer sheet unwinding position
20
. A support shaft
21
is disposed with bearings below the veneer roll
9
and a plurality of base end pulleys
22
each of a large diameter are mounted on the support shaft
21
along the shaft direction at arbitrary spatial intervals. A pair of support arms are respectively held in a swingable manner at each of both ends of the support shaft
21
of the base end pulleys
22
and distal pulleys
23
each of a small diameter are rotatably supported between the pair of support arms. Drive guide bands
24
respectively extend over the large diameter base end pulleys
22
and the small diameter distal pulleys
23
. The distal pulleys
23
are pivoted toward the veneer roll
9
with the support shaft
21
as a fulcrum and thereby, the drive guide bands
24
is pressed to the veneer roll
9
on a lower portion on the circumferential surface of the veneer roll
9
. When the drive guide bands
24
are swung counterclockwise as viewed in
FIG. 13
, the veneer sheet
1
is unwound by a frictional force between the veneer roll
9
and the drive guide bands
24
. An unwound veneer sheet
1
is transferred on the drive guide bands
24
, further runs to a folded back guide member
25
and then, again folded back in a transport direction sectionally in a Z letter form to proceed onto a transport conveyor
26
.
The veneer sheet
1
is transported in a state in which a fiber orientation thereof intersects the transport direction on the transport conveyor
26
and a position thereof is controlled in the course of travel by a position control means
27
disposed in parallel to the transport conveyor
26
. The position control means
27
has a construction in which a first control belt is arranged not only in parallel to the transport conveyor
26
but in a vertical state of the shaft direction on one side of the transport conveyor
26
as viewed in the transport direction and a press body that presses the veneer sheet
1
in transportation on the other side thereof. The press body controls the position of the veneer sheet
1
by pressing the veneer sheet
1
from the other side toward the first control belt
28
side in a direction intersecting the transport direction of the veneer sheet
1
. As press means, two means are exemplified: one is that the veneer sheet
1
is moved forward or rearward, in a direction intersecting the transport direction by a fluid pressure and the other is that as shown in the figure, a second control belt
29
not only in parallel to the transport conveyor
26
but in a vertical state of the shaft direction is employed and an eccentric ring
30
is supported by bearings between both tracks of the second control belt
29
, wherein the eccentric ring
30
is rotated. To be more detailed, the surface of a track of the second control belt
29
is moved toward along a direction intersecting the transport direction by rotation of the eccentric ring
30
and thereby the veneer sheet
1
is pressed by the surface of a track of the second control belt
29
at one side of the sheet
1
, with the result that the position of the veneer sheet
1
is eventually controlled by the first control belt
28
that turns in the same direction as the transport direction at its contact surface with the sheet
1
.
A change-over conveyor
31
is provided at the terminal end of the transport conveyor
26
and the change-over conveyor
31
swings at any angle with the terminal end of the transport conveyor
26
as a fulcrum. A distal end of the change-over conveyor
31
is connected to conveyors in two ways: The distal end is connected to the starting end of a lower level conveyor
32
such that a transport route of the veneer sheet
1
proceeds straight or the distal end of the change-over conveyor
31
is connected to the starting end of an upper level conveyor
33
such that a transport route of the veneer sheet
1
proceeds above. Therefore, the veneer sheet
1
transported on the transport conveyor
26
is transferred into the lower level conveyor
32
and the upper level conveyor
33
in an alternate manner by actions of the change-over conveyor
31
. Each veneer sheet
1
that has been transported in the transport conveyor
26
is aligned in regard to the leading edge in either of the lower level conveyor
32
or the upper level conveyor
33
.
A combining conveyors
34
is connected at a position downstream from the lower level conveyor
32
and a veneer sheet
1
is transferred onto the lower level conveyor
32
keeping a straight movement. On the other hand, there is provided a guide conveyor
35
that guides the veneer sheet
1
on the upper level conveyor
33
to a transport surface of the combining conveyor
34
at the terminal end of the upper conveyor
33
. The guide conveyor
35
has a down slope in a transport direction and the distal end thereof is kept being disposed close to the transport surface of the combining conveyor
34
. On the combining conveyor
34
, a veneer sheet
1
that is transported in a straight movement and a veneer sheet
1
that is transported from the upper level conveyor
33
through the guide conveyor
35
are combined in an overlapping manner while being aligned such that the leading edges of both veneer sheets
1
coincide with each other.
A veneer sheet reeling position
5
at which two veneer sheets
1
overlapping each other are simultaneously reeled is located at a position downstream from the combining conveyor
34
. A drive roller
6
whose length direction at least intersects the transport direction of the veneer sheet
1
is supported with bearings such that the upper surface thereof is at almost the same height as that of the transport surface of the combining conveyor
34
. While the drive roller
6
has a variable speed but normally rotates at the same speed as that of the combining conveyor
34
. A take-up reel
7
of a large diameter is rotatably supported with bearings at both ends thereof by a reel receiver
8
above the drive roller
6
. The take-up reel
7
is put in contact with the upper surface of the drive roller
6
at the lower surface thereof and thereby, the take-up reel
7
is rotated counterclockwise as viewed in
FIG. 13
by a frictional force produced from a driving force of the drive roller
6
. A plurality of thread feeding mechanisms
10
are disposed at positions downstream from the take-up reel
7
at arbitrary spatial intervals along a length direction of the take-up reel
7
.
The two overlapping veneer sheets
1
are transported by being carried on the combining conveyor
34
to arrive into the veneer sheet reeling position
5
. On arrival at the veneer sheet reeling position
5
, tips of the threads
12
fed from thread reels
11
of the thread feeding mechanisms
10
are wound on the take-up reel
7
at arbitrary spatial intervals in the length direction thereof. When the two overlapping veneer sheets
1
arrive at between the drive roller
6
and the take-up reel
7
, the take-up reel
7
is rotated in a reverse direction by a driving force of the drive roller
6
that rotates at the same speed as that of the composing conveyor
34
and takes up the two overlapping veneer sheets
1
with the threads
12
at a plurality of positions as guides. The two overlapping veneer sheets
1
that are transported from the combining conveyor
34
are sequentially wound on the take-up reel
7
.
There is a case where a spatial interval between a preceding two overlapping veneer sheets
1
and the following two overlapping veneer sheets
1
is narrowed in consideration of efficiency in winding on the take-up reel
7
. Description will be made of interval narrowing means for pairs of two overlapping veneer sheets
1
end to end in a transport direction with reference to FIG.
15
.
A pulse generator
36
is provided to the combining conveyor
34
and a detector
37
is placed above the combining conveyor
34
and as a detector, a contact type, or a non-contact type such as a transparency type, a reflection type of the like may be employed. A distance setter
39
that sets a distance K from a position of the detector
37
to the drive roller
6
is connected to a drive controller
38
and the distance K is stored as the number of pulses by reading the number of pulses from the pulse generator
36
. When the detector
37
senses the leading edges of the two overlapping veneer sheets
1
(a face sheet and a substrate sheet), the detector
37
transmits a detection instruction to the drive controller
38
that is a control system of the drive roller
6
. A plurality of memory elements is included in the drive controller
38
and the detection instruction is written on one of the memory elements and the drive controller
38
stops driving of the drive roller
6
. The two overlapping veneer sheets
1
(a face sheet and a substrate sheet) are transported on the combining conveyor
34
by a distance K and when the memory element detects the transportation by counting up of the number of the pulses, the drive controller
38
not only activates the drive roller
6
but resets the memory element. The two overlapping veneer sheets
1
(a face sheet and a substrate sheet) that arrives at the upper surface position of the drive roller
6
are wound on the take-up reel
7
by driving of the drive roller
6
over an angular turn along a circumferential direction corresponding to a length of the two overlapping veneer sheets
1
(a face sheet and a substrate sheet) with the threads
12
as guide. The length of the two overlapping veneer sheets
1
(a face sheet and a substrate sheet is determined by the detector
37
such that when the two overlapping veneer sheets
1
(a face sheet and a substrate sheet) are transported on the combining conveyor
34
, the detector
37
senses the leading and trailing edges and stores the length as the number of pulses in the drive controller
38
. It should be appreciated that since veneer sheets are cut at almost the same length, the constant length may be stored in the drive controller
38
as a sheet length
40
in advance.
When the number of pulses corresponding to the sheet length
40
is counted, a drive stop instruction is issued to the drive roller
6
from the drive controller
38
to stop the drive roller
6
again. Then, the next two overlapping veneer sheets
1
(a face sheet and a substrate sheet) are transported on the combining conveyor
34
and when the leading edge is sensed by the detector
37
, process thereafter goes following steps similar to those as describe above. In this case, if the preceding two overlapping veneer sheets
1
(a face sheet and a substrate sheet) are still in transportation on the combining conveyor
34
or still in winding operation on the take-up reel
7
, since the memory element that stores the preceding detection instruction has not yet been reset, pulse control is performed by another memory element. In such a way, the next pair of two overlapping veneer sheets
1
(a face sheet and a substrate sheet) come to arrives at the upper point of the drive roller
6
and then, the next two overlapping veneer sheets
1
(a face sheet and a substrate sheet) are wound on the take-up reel
7
with the threads
12
as guide while spatial intervals between the successive two pairs of the sheets are narrowed. Such operations are repeated and thereby, the drive roller
6
intermittently rotates and pairs of two overlapping veneer sheets
1
are efficiently wound on the take-up reel
7
as shown in
FIG. 16
while spatial intervals between pairs of the sheets adjacent to each other are narrowed.
The leading edge of a next pair of overlapping veneer sheets are detected by the detector
37
, and then, the two overlapping veneer sheets
1
arrives at the upper position of the drive roller
6
after steps similar to those as described above and wound on the take-up reel
7
with the threads
12
as guide while spatial intervals between successive pairs of the sheets are narrowed as shown in FIG.
16
. By repetition of the above described operations, the drive roller
6
intermittently rotates and pairs of two overlapping veneer sheets
1
are reeled in an efficient manner while spatial intervals between successive pairs of the sheets are narrowed.
The interval narrowing means shown in
FIG. 15
has no problem in reeling as far as a transport speed of the conveyor and an average winding speed (slow) in intermittent movement almost corresponds to each other since pairs of two overlapping veneer sheets
1
are reeled in a veneer sheet reeling position
5
by an intermittent rotation of the drive roller
6
. However, in a higher winding speed, a problem arises. In this case, adjustment of spatial intervals of pairs of two overlapping veneer sheets
1
is performed during transportation in a stage prior to the veneer sheet reeling position
5
. Then, description will be made of another embodiment of interval narrowing means with reference to
FIG. 17
, wherein the same constituents as those corresponding of
FIG. 15
are indicated by the same marks.
At first, the starting edge of an interval narrowing conveyor
43
that performs narrowing spatial intervals between pairs of two overlapping veneer sheets
1
, end to end, in the transport direction is disposed in a staggered manner with the terminal end of a combining conveyor
34
and both conveyors are set such that the conveyors can independently be operated. In this situation, when a detector
37
that is located above the combining conveyor
34
senses the leading edge of a pair of two overlapping veneer sheets
1
, the detector
37
transmits a detection instruction to a drive controller
38
that is a control system of the interval narrowing conveyor
43
. A distance setter
39
that sets a distance K from the detector
37
to a point on the interval narrowing conveyor
43
is connected to the drive controller
38
and the drive controller
38
stops driving of the interval narrowing conveyor
43
in response to the detection instruction. A pulse generator
36
is provided to the combining conveyor
34
and the two overlapping veneer sheets
1
are transported on the combining conveyor
34
by a distance K and the distance K is detected by counting up the number of pulses. The two overlapping veneer sheets
1
that arrives at the interval narrowing conveyor
43
is further transported on the interval narrowing conveyor
43
by driving thereof over a length of the two overlapping veneer sheets
1
. The length of the two overlapping veneer sheets
1
(a face sheet and a substrate sheet) is determined by the detector
37
such that when the two overlapping veneer sheets
1
(a face sheet and a substrate sheet) are transported on the combining conveyor
34
, the detector
37
senses the leading and trailing edges and stores the length as the number of pulses in the drive controller
38
. It should be appreciated that since veneer sheets are cut at almost the same length, the constant length may be stored in the drive controller
38
as a sheet length in advance. Spatial intervals between pairs of two overlapping veneer sheets
1
, end to end, in the transport direction are narrowed on the interval narrowing conveyor
43
and a pair of two overlapping veneer sheets
1
are transferred to another conveyor and wound on the take-up reel
7
at a speed matching a winding speed.
In this situation, when the reel receiver
8
that supports the take-up reel
7
with bearings is fixedly positioned, the combining conveyor
34
and the drive roller
6
are freely swung downward with the starting end of the combining conveyor
34
as a fulcrum and as a winding diameter of a veneer roll increases, the drive roller
6
is swingably lowered in an automatic manner together with the combining conveyor
34
by a half of the increase in diameter. Contrary to this, when bearings supporting the drive roller
6
are fixedly positioned, the reel receiver
8
of the take-up reel
7
is raised by a half of the increase in diameter of the take-up reel. Further, since the drive roller
6
imparts a frictional force to the take-up reel
7
, a fluid pressure, a balance weight or the like is employed in order to maintain a state in which the drive roller
6
is in press contact with the take-up reel
7
under a constant pressure all the time.
In such a way, pairs of two overlapping veneer sheets
1
are sequentially reeled to form a composite veneer roll
41
in which veneer sheets are combined as pairs of a face sheet and a substrate sheet for producing a three ply laminated wood. The composite veneer roll
41
is transported to a composite veneer roll stock area of a reeling deck. The composite veneer roll stock area is constructed in a structure including beams vertically disposed at many levels and a plurality of composite veneer rolls are stored for a time period (one day and night) in the composite veneer roll stock area to achieve an equilibrium moisture content in common with a face sheet and a substrate sheet.
In the embodiment, description is made in the case where veneer sheets
1
after drying each of a constant length are individually unwound from one veneer roll
9
in the veneer sheet unwinding position
20
and pairs of two veneer sheets are combined in an overlapping manner to produce a composite form. This is because a face sheet and a substrate sheet are almost the same as each other in terms of grade and therefore and two veneer sheets of the same kind both for use as a face sheet are superimposed on each other, or on the contrary two veneer sheets of the same kind both for use as a substrate sheet are superimposed on each other. In such a case, if a dried veneer sheet
1
after drying is continuous, the sheet
1
is cut into sheets of a constant length during transportation on the transport conveyor
26
.
In
FIG. 18
, an embodiment is shown in which two veneer rolls
9
of different kinds (for a face sheet and a substrate sheet) are provided in a veneer sheet unwinding position
20
and veneer sheets
1
after drying each of a constant length are individually cut one by one from each of the two veneer rolls
9
to combine two veneer sheets as two overlapping veneer sheets
1
and produce a composite form respectively from the two veneer rolls
9
. In this case, all that is needed is that the system is configured as follows: Two pair of a transport conveyor
26
and position control means
27
disposed in parallel to the transport conveyor
26
, similar to the above described, are arranged at two levels, one above the other, respectively for uses in transportation of face sheets and substrate sheets. Further, a guide conveyor
35
is disposed at the terminal end of the upper level transport conveyor
26
and the guide conveyor
35
guides veneer sheets
1
to a transport surface of a combining conveyor
34
. For convenience of description, the lower level transport conveyor
26
is for a face sheet and the upper level transport conveyor is for a substrate sheet.
In this case, veneer sheets (a face sheet and a substrate sheet) after drying each of a constant length are individually unwound from two veneer rolls
9
(respectively for a face sheet and a substrate sheet) in a veneer sheet unwinding position
20
and the veneer sheets
1
(a face sheet and a substrate sheet) after drying are transferred on the upper and lower level transport conveyors
26
. Positions of the veneer sheets
1
(a face sheet and a substrate sheet) after drying are respectively controlled on the upper and lower level transport conveyors
26
by position control means
27
. Thereafter, a veneer sheet
1
(a face sheet) transported in a straight movement from the lower level transport conveyor
26
and a veneer sheet
1
(a substrate sheet) transported from the upper level transport conveyor
26
through the guide conveyor
35
are combined on the combining conveyor
34
in an overlapping manner while the leading edges of both veneer sheets are aligned. Then, pairs of two overlapping veneer sheets
1
(a face sheet and a substrate sheet) are reeled while spatial intervals between pairs of two overlapping veneer sheets
1
, end to end, in the transport direction are narrowed by the interval narrowing means as a composite veneer roll
41
and the composite veneer roll
41
is stored in a composite veneer roll stock area to achieve an equilibrium between veneer sheets of different kinds (a face sheet and a substrate sheet) in moisture content.
In the embodiments, descriptions are made of the case where pairs of two overlapping veneer sheets
1
are reeled while spatial intervals between pairs of two overlapping veneer sheets
1
, end to end, in the transport direction are narrowed. This process is one in which pairs of a face sheet and a substrate sheet in a composite state for use in producing three ply laminated wood. Next, description will be made of an embodiment to obtain a composite veneer roll obtained by reeling three kinds of veneer sheets including face, central core and substrate sheets that are used in producing five ply laminated wood.
Such a composite veneer roll is achieved as follows: As shown in
FIG. 19
, pairs of two overlapping dried veneer sheets and single dried veneer sheets are alternately wound with a pair of two overlapping dried veneer sheets and a single dried veneer sheet as a set on a large diameter take-up reel
7
as described above with threads
12
as guide into a multilayer structure to form a composite veneer roll and the composite veneer roll is used in producing five ply laminated wood. That is, in this case, pairs of two veneer sheets
1
overlapping each other and single veneer sheets, all with the same fiber orientation, are reeled in an alternate manner along a winding direction.
There are three cases in order to realize a composite veneer roll described above in a broad sense: in a first case, a face sheet, a substrate sheet and a central core sheet are all of the same kind, in a second case, a substrate sheet and a central core sheet are both of the same kind, but a face sheet is different from the other two, and in a third case, a face sheet, a substrate sheet and a central sheet are all different from one another. Among them, the former two will below be described with reference to the figures described above.
Description will be made of the case where a face sheet, a substrate sheet and a central core sheet are all of the same kind with reference to
FIGS. 13 and 14
.
Veneer sheets
1
after drying each of a constant length are individually unwound to be transferred onto the transport conveyor
26
in the veneer sheet unwinding position
20
. A position of a veneer sheet
1
is controlled on the transport conveyor
26
by the position control means
27
. Then, two veneer sheets
1
are transported in a straight movement on the lower level conveyor
32
by connecting the change-over conveyor
31
to the lower level conveyor
32
. After the two veneer sheets
1
are transported in a straight movement, a single veneer sheet
1
is transferred and transported on the upper level transport conveyor
33
, by connecting the change-over conveyor
31
to the upper conveyor
33
. Therefore, the change-over conveyor
31
transfers two veneer sheets to the lower level conveyor
32
to transport thereon, while the change-over conveyor
31
transfers a single veneer sheet to the upper level conveyor
33
to transport thereon. On the combining conveyor
34
, a single veneer sheet
1
transported from the upper level conveyor
33
through the guide conveyor
35
overlaps and is aligned with one of a pair of two veneer sheets
1
transported straight on the lower level conveyor
32
such that the leading edges of the single sheets coincide with each other. Then, a pair of two overlapping veneer sheets
1
are wound on the take-up reel
7
by the interval narrowing means. Following the winding, the other of the pair of two veneer sheets
1
is transported straight from the lower level conveyor
32
subsequent to the one of the pair of two veneer sheets
1
onto the combining conveyor
34
. In such a way, pairs of two overlapping veneer sheets
1
and single veneer sheets
1
are alternately transported on the combining conveyor
34
and veneer sheets
1
are efficiently wound on the take-up reel
7
while spatial intervals between pairs of two overlapping veneer sheets
1
and single veneer sheets
1
, end to end, in the winding direction are narrowed as shown in FIG.
20
.
Then, description will be made of a case where kinds of a substrate sheet and a central core sheet are the same as each other, but a face sheet is of a dedicated kind with reference to FIG.
18
.
In this case, for convenience of description, among two veneer sheet rolls
9
, the upper level veneer roll
9
is used for substrate sheets and central core sheets, while the lower level veneer roll
9
is exclusively used for face sheets. Single veneer sheets
1
after drying each of a constant length are individually wound from the veneer rolls
9
and respectively transferred onto the upper and lower level transport conveyors
26
,
26
. Positions of the single veneer sheets are controlled on the upper and lower level transport conveyors
26
,
26
by the position control means
27
respectively. Thereafter, a single veneer sheet
1
(a face sheet) transported straight from the lower level conveyor
26
and a single veneer sheet
1
(in this case, a substrate sheet) transported from the upper level transport conveyor
26
through the guide conveyor
35
are combined and aligned with respect to the leading edges in an overlapping manner. Then, the two overlapping veneer sheets
1
are wound on the take-up reel
7
by the interval narrowing means. After winding of the two overlapping veneer sheets
1
(a face sheet and a substrate), a single veneer sheet
1
(in this case, a central core sheet) is transported from the upper level transport conveyor
26
through the guide conveyor
35
following the two overlapping veneer sheets
1
(a face sheet and a substrate). That is, single veneer sheets
1
are alternately used as a substrate sheet and a central core sheet. In a case of the substrate sheet, a single veneer sheet
1
from the upper level transport conveyor
26
is superimposed on a single veneer sheet
1
(a face sheet) transported from the lower level transport conveyor
26
, whereas in a case of a central core sheet, the veneer sheet
1
is alone wound on a take-up reel
7
as a composite veneer roll
41
while spatial intervals between the preceding two overlapping veneer sheets
1
or the following two overlapping veneer sheets
1
are narrowed in an end-to-end arrangement in the winding direction by the interval narrowing means. Composite veneer rolls are stored in the composite veneer roll stock area. It should be appreciated that in this case, an unwinding speed of the upper level roll (alternately used for a substrate sheet and a central core sheet) is controlled so as to be about two times that of the lower level roll (for a face sheet) and a transport ratio in a unit time between the numbers of veneer sheets
1
(a face sheet) transported from the lower level transport conveyor
26
and veneer sheets
1
(alternately changed between a substrate sheet and a central sheet) transported from the upper level transport conveyor
26
through the guide conveyor
35
is 1:2.
In
FIG. 21
, there is shown an embodiment in which single veneer sheets
1
(a face sheet, a substrate sheet and a central sheet) after drying each of a constant length are individually unwound from three veneer rolls
9
of different sheet kinds (for a face sheet, a substrate sheet and a central sheet) in the veneer sheet unwinding position
20
, and pairs of two overlapping veneer sheets (a face sheet and a substrate sheet) and single veneer sheet (a center core sheet) are again reeled as a set to produce a composite veneer roll. In this embodiment, transport conveyors
26
and position control means
27
, both similar to those in the above described embodiments, are respectively provided in three levels for a face sheet, a substrate sheet and a center core sheet. For convenience of description, it is assumed that among the transport conveyors at respective levels, the transport conveyor
26
at the upper level is used for a central core sheet, the transport conveyor
26
at the middle level is used for a substrate sheet and the transport conveyor
26
at the lower level is used for a face sheet. A guide conveyor
35
that guides a single veneer sheet
1
(a substrate sheet) from the terminal end of the middle level transport conveyor
26
is located at a transport surface of a combining conveyor
34
that is connected to the lower transport conveyor
26
. Further, a relay conveyor
42
is disposed between the combining conveyor
34
and a veneer sheet winding position
5
. The starting end of the relay conveyor
42
and the terminal end of the combining conveyor
34
are in a staggered manner arranged and can circulate independently from each other. A guide conveyor
35
is disposed at a transport surface of the relay conveyor
42
and the guide conveyor
35
transfers a single veneer sheet
1
(a central core sheet) from the terminal end of the upper level transport conveyor
26
to the transport surface.
In this case, single veneer sheets
1
(a face sheet, a substrate sheet and a central sheet) after drying each of a constant length are individually unwound from respective three veneer rolls
9
of different sheet kinds (for a face sheet, a substrate sheet and a central core sheet) at the veneer sheet unwinding position
20
and the single veneer sheets
1
are respectively fed onto the upper, middle and lower level transport conveyors
26
. Single veneer sheets
1
(a face sheet, a substrate and a central core sheet) are controlled with respect to position on the upper, middle and lower level transport conveyors
26
by the respective position control means
27
. Thereafter, a single veneer sheet
1
(a face sheet) transported straight from the lower level transport conveyor
26
and a single veneer sheet
1
(a substrate sheet) transported from the middle level transport conveyor
26
through the guide conveyor
35
are combined in an overlapping manner in alignment at the leading edges.
Next, description will be made of interval narrowing means in the embodiment with reference to FIG.
22
.
A pulse generator
36
is provided to the combining conveyor
34
and a first detector
44
as described above is disposed above the combining conveyor
34
. The starting end of the relay conveyor
42
is in a staggered manner connected to the terminal end of the combining conveyor
34
. A pule generator
45
is provided to the relay conveyor
42
and further a second detector
46
similar to the above described is disposed above the relay conveyor
42
. A distance setter
39
is connected to a drive controller
38
and in the distance setter
39
, a distance L
1
from a position of the first detector
44
to the drive roller
6
and a distance L
2
from the second detector
46
to the drive roller
6
are set. The distances L
1
and L
2
are stored as the numbers of pulses by reading the numbers of pulses from the pulse generators
36
and
45
.
When the first detector
44
senses the leading edge of a pair of two overlapping veneer sheets
1
(a face sheet and a substrate sheet) transported on the combining conveyor
34
, the first detector
44
transmits a detection instruction to a drive controller
38
that is a control system of the drive roller
6
. A plurality of memory elements are included in the drive controller
38
, the detection instruction is written on one of the memory elements and not only does the drive controller
38
stop the drive roller
6
but also transmits an unwinding prohibitive instruction to an unwinding controller
47
(for a central core sheet) for the upper level to prevent a single veneer sheet
1
(a central core sheet) from being transported onto the upper level transport conveyor
26
. A pair of two overlapping veneer sheet
1
(a face sheet and a substrate sheet) are transported on the combining conveyor
34
and the relay conveyor
42
over distance L
1
and when the memory element detects by counting the number of pulses, an activating instruction is transmitted to the drive roller
6
to restart activation thereof. An unwinding start instruction is transmitted to the upper level unwinding controller
47
to restart an unwinding operation at the upper level and thereby, a single veneer sheet
1
(a central core sheet) is started to transport from the upper level transport conveyor
26
to there lay conveyor
42
. After issuance of all the instructions is finished, the element is reset. A pair of two overlapping veneer sheets
1
that has arrived at the upper point of the drive roller
6
is driven by the drive roller
6
over a length of the sheets and thereby, are wound on the take-up reel
7
with threads
12
as guide. The length of the two overlapping veneer sheets is determined by the first detector
44
, such that when the pair of two overlapping veneer sheets
1
(a face sheet and a substrate sheet) are transported on the combining conveyor
34
, the first detector
44
senses the leading edge and trailing edge and the length is stored in the drive controller
38
as the number of pulses.
On the other hand, a single veneer sheet
1
(a central core sheet) waiting on the upper level transport conveyor
26
is transported onto the relay conveyor
42
through the guide conveyor
35
. When the second detector
46
senses the leading edge of a single veneer sheet
1
(a central core sheet) in the course of transportation on the relay conveyor
42
by the circulation thereof, transmits a detection instruction to the drive controller
38
. The detection instruction is written on one of the memory elements in the drive controller
38
and not only is driving of the drive roller
6
stopped but an unwinding prohibitive instruction is transmitted to the unwinding controller
48
for the middle and lower levels. Transportation of veneer sheets
1
(a face sheet and a substrate) from the middle and lower transport conveyors
26
onto the combining conveyor
34
is prevented from occurring.
When a veneer sheet
1
(a central core sheet) is transported on the relay conveyor
42
over a distance L
2
and the memory element detects the transportation by counting up of the number of pulses, an activation instruction is issued to the drive roller
6
to restart activation thereof. Further, an unwinding start instruction is issued to the unwinding controller
48
for the middle and lower levels to restart unwinding operations at the middle and lower levels and single veneer sheets
1
(a face sheet and a substrate sheet) are restarted to transport onto the combining conveyor
34
from the middle and lower level transport conveyors
26
. After all the instructions are issued, the memory element is reset. A single veneer sheet
1
(a central core sheet) that has arrived on the drive roller
6
is driven over a length of the sheet by the drive roller
6
and thereby, the single veneer sheet
1
(a central core sheet) is wound on the take-up reel
7
with the threads
12
as guide while a spatial interval between the following single veneer sheet
1
and the trailing end of the pair of two overlapping veneer sheets
1
(a face sheet and a substrate sheet) wound previously is narrowed. The length of the single veneer sheet (a central core sheet) is determined by the second detector
46
, such that when a single veneer sheets
1
(a central core sheet) is transported on the relay conveyor
42
, the second detector
46
senses the leading edge and trailing edge and the length is stored in the drive controller
38
as the number of pulses. It should be appreciated that since lengths
40
of single veneer sheets
1
are almost constant in cutting, the constant length may be stored in the drive controller
38
as a length
40
similar to the described above.
By repetition of the above described series of operations, the drive roller
6
intermittently rotates and pairs of two overlapping veneer sheets
1
(a face sheet and a substrate sheet) and single veneer sheets
1
(a central core sheet), with a pair of overlapping veneer sheets and a single veneer sheet as a set, are efficiently wound on the take-up reel
7
in a sequential manner while a spatial interval between single veneer sheets and pairs of two overlapping veneer sheets, end to end, arranged in the winding direction is narrowed. A composite veneer roll
41
reeled in such a way is transported to a composite veneer roll stock area and stored with the result that an equilibrium in moisture content is achieved between sheets of different kinds (a face sheet and a substrate sheet). It should be appreciated that while in the embodiment, description is made of the case where control is performed by pulses that are converted from a distance for convenience, similar control can also be achieved by using a delay circuit in which a distance is converted to a time period.
In the embodiment, while an unwinding prohibitive instruction and an unwinding start instruction are issued to the unwinding controller
47
(for a central core sheet) for the upper level or the unwinding controller
48
for the middle and lower levels by pulse control of a memory element in the drive controller
38
, this procedures can be replaced with the following way.
That is, when the trailing edges of a pair of two overlapping veneer sheets
1
(a face sheet and a substrate sheet) are sensed by the second detector
46
disposed above the relay conveyor
42
, the detection instruction is transmitted to the unwinding controller
48
for the middle and lower levels from the drive controller
38
as an unwinding prohibitive instruction. Transportation of veneer sheets
1
(a face sheet and a substrate sheet) onto the combining conveyor
34
from the middle and lower level transport conveyors
26
is prevented from occurring in response to the instruction. On the other hand, in synchronism with this issuance of the detection instruction, the detection instruction is further transmitted to the unwinding controller
47
for the upper level from the drive controller
38
as a unwinding starting instruction. Transportation of a single veneer sheet
1
(a central core sheet) onto the relay conveyor
42
from the upper level transport conveyor
26
is restarted in response to the instruction. A single veneer sheet
1
(a central core sheet) waiting on the upper level conveyor
26
is transported onto the relay conveyor
42
through the guide conveyor
35
. The second detector
46
senses the leading edge of a single veneer sheet
1
(a central core sheet) in the course of transportation on the relay conveyor by circulation of the belt thereof, the second detector
46
transmits the detection instruction to the drive controller
38
and then the drive controller
38
issues the detection instruction to the unwinding controllers
48
for the middle and lower levels as the unwinding prohibitive instruction, wherein the unwinding controllers
48
for the middle and lower levels are connected to the drive controller
38
. Transportation of two veneer sheets
1
(a face sheet and a substrate sheet) onto the combining conveyor
34
respectively from the middle and lower level transport conveyors
26
are prevented from occurring in response to the instruction.
While interval narrowing means shown in
FIG. 22
is operated by intermittent rotation of a drive roller
6
in a veneer sheet reeling position
5
, description will be made of another embodiment of the interval narrowing means with reference to
FIG. 23
, wherein the above described interval narrowing means performs narrowing of a spatial interval in the course of transportation in a stage prior to the veneer sheet reeling position
5
. It should be appreciated that the same constituents as those corresponding of
FIG. 22
are indicated by the same marks.
The starting end of a interval narrowing conveyor
43
that performs narrowing of the spatial interval is disposed in a staggered manner with the terminal end of a relay conveyor
42
and the conveyors
43
and
42
can independently be driven. In this configuration, the first detector
44
senses the leading edge of a pair of two overlapping veneer sheets
1
(a face sheet and a substrate sheet) transported on a combining conveyor
34
, the first detector
44
transmits a detection instruction to a drive controller
38
that is a control system of the interval narrowing conveyor
43
. A plurality of memory elements are included in the drive controller
38
and the detection instruction is written on one of the memory elements and the drive controller
38
not only stops driving of the interval narrowing conveyor
43
, but transmits an unwinding prohibitive instruction to an unwinding controller
47
(for a center core sheet) for the upper level with the result that transportation of a single veneer sheet
1
(a central core sheet) to the upper level transport conveyor
26
is prohibited. When a pair of two overlapping veneer sheets
1
(a face sheet and a substrate sheet) are transported on the combining conveyor
34
and the relay conveyor
42
over a distance L
1
and the memory element detects the transportation by counting up the number of pulses, an activation instruction is issued to the interval narrowing conveyor
43
to restart activation thereof. Further, an unwinding start instruction is issued to an unwinding controller
47
for the upper level to restart an unwinding operation at the upper level and restart transportation of a single veneer sheet (a central core sheet) onto the relay conveyor
42
from the upper level transport conveyor
26
. After all the instructions are issued, the memory element is reset. A pair of two overlapping veneer sheets
1
(a face sheet and a substrate sheet) that has arrived on the interval narrowing conveyor
43
are wound on a take-up reel
7
with threads
12
as guide by driving the interval narrowing conveyor
43
over a length of the pair of two overlapping veneer sheets
1
(a face sheet and a substrate sheet).
On the other hand, a single veneer sheet
1
(a central core sheet) waiting on the upper level transport conveyor
26
is transported onto the relay conveyor
42
through the guide conveyor
35
. When a second detector
46
senses the leading edge of a single veneer sheet
1
(a central core sheet) in the course of transportation in company with of circulation of the relay conveyor
42
, the second detector
46
transmits a detection instruction to the drive controller
38
. The detection instruction is written on one of memory elements in the drive controller
38
and thereby, not only is driving of the interval narrowing conveyor
43
stopped but the detection instruction is transmitted to the unwinding controller
48
for the middle and lower levels as an unwinding prohibitive instruction. Transportation of veneer sheets
1
(a face sheet and a substrate sheet) respectively from the middle and lower level transport conveyors
26
onto the combining conveyor
34
is prevented from occurring.
The veneer sheet
1
(a central core sheet) is transport on the relay conveyor
42
over a distance L
2
and when the memory element detects the transportation by counting up the number of pulses, an activation instruction is issued to the interval narrowing conveyor
43
to restart activation thereof. Further, an unwinding start instruction is issued to the unwinding controller
48
for the middle and lower levels to restart unwinding operations at the middle and lower levels, with the result that transportation of veneer sheets
1
(a face sheet and a substrate sheet) from the middle and lower level conveyors
26
onto the combining conveyor
34
is restarted. After all the instruction are issued, the memory element is reset. A single veneer sheet
1
(a central core sheet) that has arrived on the interval narrowing conveyor
43
is transported on the interval narrowing conveyor
43
by driving the conveyor
43
over a length of the pair of two overlapping veneer sheets
1
(a face sheet and a substrate sheet). Hence, pairs of two overlapping veneer sheets
1
(a face sheet and a substrate sheet) and single veneer sheets
1
(a central core sheet) are in a waiting state on the interval narrowing conveyor
43
in the alternate order while a spatial interval between a single veneer sheets and a pair of two overlapping veneer sheets, end to end, in sequence in the winding direction is narrowed and thereafter, the pairs of two overlapping veneer sheets
1
(a face sheet and a substrate sheet) and the single veneer sheet
1
(a center core sheet) are respectively transported to the veneer sheet reeling position
5
in an alternate manner, followed by winding the veneer sheet and sheets in the alternate order on a take-up reel
7
with threads
12
as guide.
In
FIGS. 24
to
26
, there is shown an embodiment in which a face veneer sheet and a substrate veneer sheet, both after drying, that are different in kinds from each other are respectively fed from piles of face veneer sheets and substrate sheets to be wound on a take-up reel
7
.
The piles
49
of face veneer sheets
1
A and substrate sheets
1
B, both after drying, that are different from each other in kinds are placed on lifters
50
and the top heights of the piles
49
are controlled to be of any value all time. A pair of conveyors connecting to the lifters
50
are installed as two routes, one above the other, in an adjacent manner to each other with pinch rollers
51
interposed therebetween. The pair of conveyors respectively for transportation of face veneer sheets and substrate veneer sheets at levels, upper and lower, are provided as interval narrowing means
52
for the veneer sheets
1
A and substrate sheets
1
B that are alternately transported one after another. The interval narrowing means
52
comprises an upstream conveyor
54
that is constructed from belts and chains on which spikes
53
are fixed at spatial intervals about two times a width of a face veneer sheet
1
A or a substrate veneer sheet
1
B and a downstream conveyor
55
downstream from the upstream conveyor
54
that is constructed from belts or chains on which spikes
53
are fixed at spatial intervals about the same width as that of a face veneer sheet
1
A or a substrate veneer sheet
1
B. The terminal end of the upstream conveyor
54
is combined in a staggered manner with the starting end of the downstream conveyor
55
and a speed of the upstream conveyor
54
is controlled so as to be almost two times that of the downstream conveyor
55
.
Position control means
27
is provided on one side of the upstream conveyor
54
as viewed in the transport direction (on the other side of the upstream conveyor
54
from the lifter
50
) at any point along the upstream conveyor
54
and the position control means
27
controls one side of each of face veneer sheets
1
A and substrate veneer sheets
1
B as view in the transportation. The position control means
27
is constituted of a control belt
56
a shaft direction of whose pulleys is vertical and the inside surface of whose belt is in parallel to the upstream conveyor
54
and can freely circulate in a direction of transportation of the upstream conveyor
54
. A roller conveyor
57
is provided such that parallel tubular rollers thereof are respectively inserted between belts or chains of the upstream conveyor
54
and the roller conveyor
57
can freely be moved so as to protrude from a transport surface or retreat from the transport surface. The roller conveyor
57
can further be circulated so as to face in a direction intersecting the transport direction of the upstream conveyor
54
.
Face sheets
1
A and substrate sheets
1
B are individually fed onto the pinch roller
51
from the tops of the piles
49
on the lifters
50
one at a time and reach onto roller conveyor
57
after being fed on the pinch rollers
51
. In this situation, the roller conveyor
57
is controlled in a raised state in which the roller conveyor
57
is protruded from the transportation surface of the upstream conveyor
54
and circulated toward the control belt
56
. A face veneer sheet
1
A or a substrate veneer sheet
1
B proceeds up to the control belt
56
so as to be eventually put in contact therewith and then one end of the face veneer sheet
1
A or the substrate veneer sheet
1
B is slid a little such that the one end is turned toward a shaft direction of the tubular rollers under control in company with rotation of the control belt
56
. Thereafter, when the roller conveyor
57
is retreated from the transport surface of the upstream conveyor
54
, the face veneer sheet
1
A or the substrate veneer sheet
1
B is transferred onto the upstream conveyor
54
and transported toward the downstream conveyor
55
with the trailing end supported by the spikes
53
.
When a face veneer sheet
1
A or a substrate veneer sheet
1
B in transportation with the spikes
53
as stoppers on the upstream conveyors
54
reaches the starting end of the down stream conveyor
55
, Since a speed of the downstream conveyor
55
is controlled so as to be about half that of the upstream conveyor
54
, the leading edge of the face veneer sheet
1
A or the substrate veneer sheet
1
B gradually catches up with spikes
53
of the downstream conveyor
55
. Just before the leading edge of the face veneer sheet
1
A or the substrate veneer sheet
1
B is put in contact with spikes
53
of the downstream conveyor
55
, the trailing edge of the face veneer sheet
1
A or the substrate veneer sheet
1
B comes to be supported by spikes
53
of the downstream conveyor
55
since an upper belt of the upstream conveyor
54
reaches a point of return at the terminal end thereof. In this situation, the face veneer sheet
1
A or the substrate veneer sheet
1
B comes to be fully disposed on the downstream conveyor
55
between spikes
53
thereof at the leading and trailing edges of the veneer sheets
1
A or
1
B and thereafter, spatial intervals between the veneer sheets
1
A or
1
B, end to end, arranged in the transportation direction are narrowed.
The starting end of a combining conveyor
34
is connected in a staggered manner to the terminal end of the lower level downstream conveyor
55
at a downstream position of the lower level downstream conveyor
55
and a substrate veneer sheet
1
B on the lower level downstream conveyor
55
is transferred keeping a straight movement with no special procedure. On the other hand, a guide conveyor
35
is disposed at the terminal end of the upper level downstream conveyor
55
and the guide conveyor
35
guides a face veneer sheet
1
A on the upper level downstream conveyor
55
onto a transport surface of the combining conveyor
34
. The guide conveyor
35
has a down slope toward the transport direction and the distal end of the guide conveyor
35
is held close to the transport surface of the combining conveyor
34
. On the combining conveyor
34
, a substrate veneer sheet
1
B transported in straight movement from the lower level downstream conveyor
55
and a face veneer sheet transported from the upper level downstream conveyor
55
through the guide conveyor
35
are combined while the leading edges of the veneer sheets
1
A and
1
B are aligned with each other in an overlapping manner.
A pair of two overlapping veneer sheets composed of a face veneer sheet
1
A and a substrate veneer sheet
1
B are transported on the combining conveyor
34
and arrive in a veneer sheet reeling position
5
. In this situation, the drive roller
6
rotates at almost the same speed as that of combining conveyor
34
, a take-up reel
7
is rotated in a reverse direction to that of the drive roller
6
by a frictional force produced from a driving force of the drive roller
6
and pairs of two overlapping veneer sheets composed of a face veneer sheet
1
A and substrate veneer sheets
1
B are wound on a take-up reel
7
. In this case, spatial intervals between pairs of overlapping veneer sheets composed of a face veneer sheet
1
A and a substrate veneer sheet
1
B are narrowed being arranged end to end in a winding direction, thereby entailing reeling of veneer sheets with good efficiency.
While in the above embodiment, description, for convenience, is made of the case where there are provided the interval narrowing means
52
constructed from the upstream and downstream conveyors
54
and
55
, and the position control means
27
respectively for use to control a face veneer sheet
1
A and a substrate veneer sheet
1
B, which are disposed at positions, above or below, at any spatial interval in the transport direction, it is also allowable that the upstream and downstream conveyors
54
and
55
are disposed in an adjacent manner at any spatial interval on both sides, left or right, of the transport direction, or disposed at opposite positions with the combining conveyor
34
interposed therebetween. Further, the interval narrowing means
52
constructed from the upstream and downstream conveyors
54
and
55
can be replaced with controlled intermittent rotation of the drive roller
6
in the veneer sheet reeling position
5
. Still further, interval narrowing means according to the controlled intermittent rotation of the drive roller
6
in the embodiments can be replaced with the interval narrowing means
52
constructed from the upstream and downstream conveyors
54
and
55
.
Next, description will be made of another embodiment of a veneer reeling apparatus of the invention with reference to
FIGS. 27
to
33
.
A transport conveyor
60
has a configuration in which a plurality of belts
63
are extended over a starting end pulley
61
and a distal end pulley
62
, and the pulleys
61
and
62
are freely rotatable by driving of a motor (not shown) and mounted on a frame
64
. A pair of reel supports
65
are provided at positions on the outsides of the transport conveyor
60
in the vicinity of the terminal end thereof in a direction perpendicular to the transport direction. In the reel supports
65
, there are provided a reel receiver
8
that supports a take-up reel
7
in a freely rotatable manner; a reel down-presser
66
that presses the take-up reel
7
downward from above when veneer sheets
1
are wound on the take-up reel
7
while respectively facing inwardly in an opposite manner, thereby constituting a veneer sheet reeling position
5
. Further, fluid cylinders
67
for use in suspension are provided on both sides of the reel supports
65
at an upper position thereof with the front sides down and the distal end of the piston rod
68
is connected to one end of a support member
70
such as chains or belts that are wound on a support section
69
of the frame
64
, while the end of the support member
70
is fixed at a support section
71
of a reel support
65
.
A winding guide member
72
is disposed in a space covering from below the take-up reel
7
to the other side of the take-up reel
7
from the veneer sheet
1
feed side, opposing to the circumferential surface of the body of the take-up reel
7
, wherein the winding guide member
72
plays a role to wind the veneer sheet
1
transported from the transport conveyor
60
on the take-up reel
7
. The winding guide member
72
includes a plurality of endless bands
73
that are arranged at arbitrary spatial intervals along the shaft direction of the take-up reel
7
and the endless bands are located, as shown in
FIG. 29
, in an opposite manner to the circumferential surface of the take-up reel
7
along the circumferential surface, from the lower surface of the take-up reel
7
to a part of the circumferential surface on the other side from the veneer sheet
1
feed side.
The winding guide member
72
shown in
FIG. 29
are constructed from a plurality of endless bands
73
that respectively extend over pulleys disposed in a base end section, a middle section, an upper section and a distal end section. That is, the pulleys
74
in the base end section are mounted on a shaft
75
of a plurality of distal end pulleys
62
of the transport conveyor
60
such that the pulleys
74
are respectively inserted between the plurality of distal end pulleys
62
that are mounted on the shaft
75
in arbitrary spatial intervals along the shaft direction. Further, pulleys
77
in the middle section are disposed in a corresponding manner to the pulleys
74
in the base section on and along a middle shaft
76
that is supported with bearings in the vicinity of the distal end of the frame
64
. An upper shaft
79
is rotatably supported between the top portions of a plurality of support members
78
disposed along a direction perpendicular to the transport direction at the distal end of the frame
64
and pulleys
80
in the upper section are disposed on the upper shat
79
along the shaft direction thereof in a corresponding manner to the pulleys
74
and
76
of the base section and the middle section. Further, as shown in
FIG. 28
, each of pulleys
81
in the distal end section are supported between the fore-ends of a pair of support arms
82
in a rotatable manner and base ends of pairs of the support arms
82
are commonly connected to a connecting beam
83
while being in pairs disposed along the connecting beam
83
. The connecting beam
83
is attached to piston rods
86
of fluid cylinders
85
that are used for a following action, wherein the fluid cylinders
85
swingably supported by brackets
84
that protrude from the lower portion in the vicinity of the distal end of the frame
64
. Pairs of the support arms
82
are provided with support sections
87
in the middle region thereof and bearing surfaces fixed on the support sections
87
are placed on the middle shaft
76
.
Therefore, each of the endless bands
73
extends from a pulley
74
in the base section, to a pulley
77
in the middle section, to a pulley
80
in the upper section and to a pulley
81
in the distal section. The transport conveyor
60
and the winding guide member
72
are controlled in rotation at almost the same speed as each other by receiving rotation of a motor
88
installed at one end of the middle shaft
76
. When pairs of the support arms
82
are swung toward the take-up reel
7
by the fluid cylinder
85
for a following action with the support sections
87
that are placed on the middle shaft
76
through the bearing surfaces of the support sections
87
each as a fulcrum, the pulleys
81
in the distal end section located at the distal ends of pairs of support arms
82
comes to touch the circumferential surface of the take-up reel
7
and the winding guide member
72
is pressed closely in plane contact with the circumferential surface of the take-up reel
7
in conformity of the curvature of the circumference.
A plurality of thread feeding mechanisms
10
for feeding the threads
12
wound as guides for winding a veneer sheet
1
on the take-up reel
7
are disposed in arbitrary spatial intervals along the shaft direction of the take-up reel
7
. For example, the thread feeding mechanisms
10
are respectively arranged between each pair of the endless bands of the winding guide member
72
and nozzles
12
N are mounted in almost the middle regions of the support arms
82
. On the other hand, in order to make the threads
12
entangled with the take-up reel
7
, highly frictional regions are provided on the take-up reels: For example, at arbitrary spatial intervals along the shaft direction thereof, sand paper pieces are attached at a plurality of spots on the take-up reel
7
or instead, small raised portions which are formed, for example by a knurling tool are provided.
Further, in the winding guide member
72
, rotary pulleys
89
are provided in order to maintain the winding guide member
72
in a firmly stretched condition under a constant tension by pushing or pulling the endless bands
73
constituting the winding guide member
72
under a pressure while guaranteeing a rotation force of the winding guide member
72
so as to be rotatable all time. That is, as shown in
FIGS. 29 and 30
, L-like levers
91
are provided in number corresponding to the number of the endless belts
73
constituting the winding guide member
72
along a shaft
90
supported with bearings on the frame
64
. The rotary pulleys
89
are rotatably supported at protruded portions of the rotary shafts
91
and the other end of the L-like shape levers
91
are fixed at piston rods of the fluid cylinders
92
for firm stretching swingably supported by a bracket
84
that protrudes from the lower portion in the vicinity of the distal end of the frame
64
. The rotary pulleys
89
shown in
FIGS. 29 and 30
press the endless belts
73
constituting the winding guide member
72
by a pressure or the rotary pulleys
89
shown in
FIG. 31
pull the endless belts
73
outwardly by a force and thereby, the winding guide member
72
is held in a firmly stretching condition, while guaranteeing a rotation force of the winding guide member
72
.
It should be appreciated that there also can be given another configuration in which the rotary pulleys
89
are rotatably supported on a shaft (not shown) inserted through the protruded portions of levers
91
located at both ends of a series of the levers
91
at arbitrary spatial intervals along the shaft direction and the other end of the L-like levers
91
at the both ends are fixed at the pistons of the fluid power cylinders
92
for firmly stretching. With such a configuration, the rotary pulleys
89
can integrally act on the winding guide member
72
in one piece to its firmly stretching condition with the result that the endless belts
73
of the winding guide member
72
can be in conformity with the curvature of the take-up reel
7
. However, as shown in the example shown in the figure, an advantage can be enjoyed in a case where there are provided the fluid cylinders
92
for the firmly stretching that individually impart pressures to the respective endless belts
73
constituting the winding guide member
72
: For example, even if there arises a deflection by a self weight in the take-up reel
7
or a thickness of a veneer sheet
1
is fluctuated, the configuration in the example can maintain firmly stretching conditions of the respective endless belts
73
of the winding guide member
72
at the same degree of tightness to impart almost the same frictional forces to a veneer sheet
1
in winding at positions on the sheet
1
along the shaft direction of the take-up reel
7
.
In a operation of reeling a veneer sheet
1
, at first a fluid is fed to a front port of each fluid cylinder
67
for suspension and thereby, the distal end of the frame
64
is swung upwardly with the shaft of the starting end pulley
61
of the transport conveyor
60
located in the transport-in side of a veneer sheet
1
as a fulcrum. Therefore, the distal end of the frame
64
swings together with the transport conveyor
60
and the winding guide member
72
and with the swing movement, the winding guide member
72
comes to be put in contact with the lower surface of the take-up reel
7
that is rotatably supported by a reel receiver
8
. Then, the fluid cylinders
85
for a following action and the fluid cylinders
92
for firm stretching are activated and the endless belts
73
of the winding guide member
72
are put into close contact with the lower surface of the take-up reel
7
at first and then with a part of the circumferential surface of the take-up reel
7
on the other side thereof from the veneer sheet
1
transport-in side while keeping a firmly stretching condition of each endless belts
73
.
Under such circumstances, threads
12
that are fed from thread reels
11
are blown through nozzles
12
N to highly frictional regions on the take-up reel
7
such that the tips of the threads
12
get entangled with the highly frictional regions. Following the thread blowing, the winding guide member
72
is rotated at least one time or preferably several times and thereby, a tension is made to be produced between the take-up reel
7
with which the threads
12
are entangled and the threads
12
. Thereafter, veneer sheets
1
transported from a previous step are guided through the transport conveyor
60
into between the lower surface of the take-up reel
7
and the winding guide member
72
that is controlled so as to run at almost the same speed as that of the transport conveyor
60
. It should be appreciated that the veneer sheets
1
may be in a damp condition as cut by a veneer lathe (not shown), or in a dry condition caused by drying in a veneer dryer (not shown), or further in a cut state that is produced by cutting a continuous veneer sheet in constant length along a fiber orientation or in a continuous state.
Since the winding guide member
72
are closely in plane contact with part of the circumferential surface of the take-up reel
7
covering from the lower portion of the take-up reel
7
to the other side from the veneer sheet
1
transport-in side, a veneer sheet
1
is wound on the take-up reel
7
keeping a plane contact along the curved surface of the take-up reel by a frictional force produced in company of driving of the winding guide member
72
. In the winding operation of a veneer sheet
1
, the threads
12
are in a firmly stretching condition between the take-up reel
7
and the nozzles. Hence, when a veneer sheet
1
is wound on the take-up reel
7
with a frictional force produced from driving of the winding guide member
72
, the threads
12
are wound on the take-up reel
7
together with the veneer sheet
1
at a plurality of positions along the shaft direction starting at the leading edge of the veneer sheet
1
.
Especially when a veneer sheet
1
is in a cut sheet state, the veneer sheets
1
can firmly be wound on the take-up reel
7
since a plurality of endless bands
73
of the winding guide member
72
are closely put in plane contact with the curvature of part of the circumferential surface of the take-up reel
7
. Further, even when a veneer sheet
1
is one after drying and a stiffness of fibers therein is high in degree as compared with a veneer sheet
1
in a damp state, the veneer sheet
1
can be wound on the take-up reel
7
in a copying condition along the outer surface thereof.
Further, the threads
12
are wound on the outer surface of a veneer sheet
1
as guides between the endless bands
73
that runs in parallel to one another which constitute the winding guide member
72
when the veneer sheet
1
is pressed onto the outer surface of the take-up reel
7
in close contact by the winding guide member
72
. For this reason, even when a close contacting state with the winding guide member
72
is canceled after a veneer sheet
1
is wound on the take-up reel
7
, there arises no chance for a winding state of the veneer sheet
1
to be unfavorably relaxed since the threads
12
are wound the veneer sheet
1
from the outside in a plurality of rows.
Following are descriptions of an embodiment in which veneer sheets
1
in a cut sheet state are wound on a take-up reel
7
while narrowing spatial intervals between the veneer sheets
1
arranged end to end in the winding direction in consideration of winding efficiency with reference to FIG.
33
.
When a detector
94
of a contact type or a non-contact type such as a transparency type and a reflection type senses the leading edge of a veneer sheet
1
, the detector transmits a detection instruction to a drive controller
95
that is a control system of the winding guide member
72
. A distance setter
96
that sets a distance K from the detector
94
to the winding guide member
72
is connected to the drive controller
95
and the drive controller
95
stops circulation of the winding guide member
72
. A pulse generator
97
is provided to the transport conveyor
60
, the veneer sheet
1
is transported over a distance K on the transport conveyor
60
and the transportation is detected by counting up of the number of pulses. The veneer sheet
1
that has arrived on the winding guide member
72
is wound on the take-up reel
7
with the threads
12
as guide by driving the winding guide member
72
over a length of the veneer sheet
1
. The length of the veneer sheet
1
is determined by detecting the leading and trailing edges thereof in transportation on the transport conveyor
60
with the detector
94
and the length thereof is stored in the drive controller
95
as the number of pulses. Further, since a length of a veneer sheet
1
is cut in a constant value, the constant value may be stored in the drive controller
95
as a length of a veneer sheet
1
in advance. When the leading edge of a next veneer sheet
1
is detected by the detector
94
, the next veneer sheet
1
arrives on the winding guide member
72
after operations in steps similar to those of the above description and is wound on the take-up reel
7
with threads
12
as guide while spatial intervals between the veneer sheets
1
arranged, end to end, in a winding direction are narrowed. With repetition of such operations, veneer sheets are sequentially wound on the take-up reel
7
in an efficient manner by intermittent circulations of the winding guide member
72
while narrowing spatial intervals between veneer sheets
1
arranged end to end in the winding direction.
It should be appreciated that when the veneer sheet
1
breaks or tears with ease from cracks, rifts or the like defect (such defects tend to frequently occur in a veneer sheet
1
after drying) even if a veneer sheet
1
that is reeled is in a continuous state, or when a veneer roll in winding operation is relaxed in the middle section thereof, as described above, a plurality of threads
12
are wound as guides together with the veneer sheet
1
and thereby, stable reeling can be attained.
Since the individual endless bands
73
constituting the winding guide member
72
are independently maintained in a firmly stretching condition by pressures of almost the same magnitude applied respectively, the endless bands
73
of the winding guide member
72
keeps in respective conditions of the same degree of firm stretching and frictional forces of the same strengths can be exerted on the veneer sheet
1
at any portion thereof along the shaft direction of the take-up reel
7
even if deflection due to self weight occurs in the take-up reel
7
or there arise fluctuations in thickness of the veneer sheet
1
.
As the veneer sheet
1
is wound on the take-up reel
7
and a diameter of the veneer roll
9
is increased, the distal end of the frame
64
is swung downward by increase in the diameter of the veneer roll
9
with the shaft of the pulley
61
of the starting end of the transport conveyor
60
as a fulcrum. Since the reel receiver
8
supporting the take-up reel
7
with the bearings is fixedly positioned, the veneer roll
9
presses down the frame
64
by increase in diameter of the veneer roll
9
through the winding guide member
72
by a pressure that overcomes a fluid pressure of the fluid cylinder
67
for suspension. Further, as a diameter of the veneer roll
9
increases, positions of the pulleys
81
in the distal end section of the winding guide member
72
is gradually raised while beating a fluid pressure of the fluid cylinder
85
for a following action (clockwise movement in FIGS.
29
and
30
). Further, with a increase in diameter of the veneer roll
9
, positions of the pulleys
89
that individually press the endless bands
73
of the winding guide member
72
to a firmly stretched condition are respectively displaced while beating pressures of the fluid cylinder
92
for firm stretching. Such displacements are apparent from comparison between a starting position for reeling of a veneer sheet
1
shown in
FIG. 29 and a
position in the course of winding operation shown in FIG.
30
.
Further, the winding guide member
72
can take another configuration as shown in
FIG. 31
in addition to the above described configuration: a lower portion of the winding guide member
72
is a base end and the distal end is an free end as shown in
FIG. 31
, and a plurality of endless bands
73
extend over the both pulleys. That is, a base end shaft
98
of the winding guide member
72
is rotatably supported at a forward position of the shaft
75
of the distal end pulley
62
of the transport conveyor
60
below the veneer sheet
1
reeling position, connection pulleys (not shown) are disposed in positions corresponding to the distal end pulleys
62
on the base end shaft
98
and a connection conveyor
107
is formed over the distal end pulleys
62
and the connection pulleys. A plurality of base end pulleys
99
are mounted on the base end shaft
98
at arbitrary spatial intervals along the direction of the shaft
98
. Pairs of support arms
100
that are bent in the middle region thereof with the distal end upward are independently swingably mounted on the base end shaft
98
with the base end shaft
98
as a fulcrum while each base end pulley
98
is sandwiched by a pair of support arms
100
. Distal end pulleys
101
of a small diameter each are rotatably supported between a pair of two adjacent support arms
100
, not only endless bands
73
extend over the base end pulleys
99
and the distal end pulleys
101
of a small diameter but the support arms
100
are commonly connected to a connection beam
102
as one piece at arbitrary positions on the support arms
100
and further, both ends of the connection beam
102
are attached to piston rods
86
of fluid cylinders
85
for a following action swingably supported on the frame
64
.
While the endless bands
73
are belts that extend over the base end pulleys
99
and the distal end pulleys
101
in an endless manner, diameters of the base end pulleys
99
and the distal end pulleys
101
are not equal to each other, but a diameter of the base end pulleys
99
is larger than that of the distal end pulleys
101
. A margin of distance arises by a difference in radius between the base end pulleys
99
and the distal end pulleys
101
when the endless bands
73
are pressed to the lower portion of the circumferential surface of the take-up reel
7
and thereby, the endless bands
73
can be pressed to the lower portion of the circumferential surface of the take-up reel
7
in a contact area with a width. More of frictional force can be used with increase in contact area between the endless belts
73
and the lower outer surface of the take-up reel
7
caused by such a pressing state over an area with the result that a veneer sheet
1
can be wound on the take-up reel
7
in a stable manner. In addition, since the support arms
100
that support the base end pulleys
99
and the distal end pulleys
101
are each bent in its middle region upward, there arises neither interference nor contact between the upper track of each of the endless bands
73
facing the circumferential surface of the take-up reel
7
and an support arm
100
, between lower surface and upper surface, and thereby, a inconvenience such as stoppage of circulation of the endless bands
73
can be avoided, which ensures winding a veneer sheet
1
on a take-up reel
7
.
Further, while in the embodiment, the frame
64
is freely swingable by means of the fluid cylinder
67
for suspension, instead a member that is swingable by a balance weight or the like can be supported by a pressure. Still further, contrary to the above described cases, the following configuration can be adopted: A position of the take-up reel
7
is vertically shiftable, while the winding guide member
72
is fixedly supported in a circulating manner. As a mechanism for vertically shifting the reel receiver
8
, as shown in
FIG. 32
, for example, the reel receivers
8
supporting the take-up reel
7
at both ends are connected to a feed shaft
104
and the feed shaft
104
is rotatably coupled with a motor
105
. On the other hand, a line sensor
106
that senses a diameter of the veneer roll
9
is provided on a reel support
65
. Therefore, a thickness of a veneer sheet
1
being wound is detected and the reel receivers
8
at both side of the take-up reel
7
are shifted upward by action of the feed shaft
104
with the motor
105
by a thickness of the veneer sheet
1
of detection for each rotation of the take-up reel
7
.
Then, description will be made of an embodiment of a tape feeding unit for feeding a tape to a veneer roll of the invention with reference to an embodiment shown in
FIGS. 34
to
57
.
In
FIG. 34
, there is shown a situation in which a veneer sheet
1
that is cut by a veneer lathe
110
and transported downstream therefrom is wound on a take-up reel
7
to form a veneer roll
9
. A drive roller
6
is in contact with the circumferential surface (direct below the shaft of the take-up reel
7
) of the veneer roll
9
and driving for winding the veneer sheet
1
on the take-up reel
7
is produced by a frictional force. Further, a tape T is stuck on a veneer sheet
1
in order to reinforce both ends of the veneer sheet
1
by inserting the tape T into between veneer sheets in winding operation.
The tape T is unwound from a feed source at an upstream position, that is a tape roll
113
wound on a core
112
, fed to a veneer roll
9
side by means of a vacuum chuck conveyor (feed conveyor)
114
as transport means and wound on a veneer sheet
1
. The tape T is fed as the tape is wound on the veneer sheet
1
. That is, the tape roll
113
is pulled into the veneer roll
9
while keeping at a fixed position and thereby, rotated in a following manner at the fixed position. There are provided first and second roller stoppers
115
and
116
that idle as forward movement stopper members in order that the tape roll rotates for unwinding while blocking forward movement of the tape roll
113
.
The roller stopper
115
is rotated in a slave manner by friction while being in contact with the outer surface of the tape roll
113
when the tape roll
113
is of a large diameter. The roller stopper
116
is rotated in a slave manner by friction while being in contact with the outer surface of the tape roll
113
when the tape roll
113
is of a small diameter. The roller stopper
116
is arranged below the roller stopper
115
, a clearance (an exit section) is located still below the roller stopper
116
and when the tape roll
113
comes to have a diameter equal to less than a predetermined value, the tape roll
113
is passed through the clearance. The tape roll
113
of a small diameter that has passed through the clearance runs to a core stopper
117
located downstream from the roller stoppers
115
and
116
and a small amount of the tape remaining on the core
112
is unwound to nothing thereon while being in contact with the core stopper
117
. After the unwinding is completed, the core
112
is discharged sideways, which will detailed later.
The vacuum chuck conveyor
114
is equipped with a vacuum box (a negative pressure chamber)
118
that extends long along the transport direction of the tape T and an endless belt
121
capable of passing gas therethrough extends over pulleys
119
and
120
such that the endless belt
121
encloses the vacuum box
118
. A negative pressure is created in the negative pressure chamber
118
by means of a vacuum pump
122
and a negative pressure acts on the tape T through holes for gas passage and the tape T is vacuum chucked on the upper surface of the belt
121
. A circulation track on the belt
121
is moved, for example, by driving from a motor
123
connected to the pulley
120
from the tape roll
113
side to the veneer roll
9
side of a veneer sheet
1
and the tape T is unwound and fed from the tape roll
113
.
Such tape feeding units
124
as a pair are provided, for example, so as to correspond to both ends of a veneer roll
9
as shown in FIG.
35
. The tape T has, for example, an adhesive layer T
1
on an upper surface thereof and the tape T is stuck on a veneer sheet
1
at both side ends thereof by the adhesive layer on the upper surface of the tape T in the course of winding the veneer sheet
1
on the take-up reel
7
. Further, a material of the tape T is, for example, paper of a predetermined quality and so on.
A tape roll
113
as a feed source of a tape T is disposed at the upstream end of a vacuum chuck conveyor
114
and a plurality of tape rolls
113
are accommodated in tape racks
125
. Two of the tape racks
125
are provided in corresponding manner to the two vacuum chuck conveyors
114
located on the left and right sides of the veneer roll
9
, wherein structures of the left and right tape racks
125
are the same as each other. Description will be made of one of the two tape racks
125
. The tape racks
125
are stepwise moved (in tact feed) inwardly from an initial position outward from both side surfaces of the veneer roll
9
at a predetermined pitch. Detailed description will be made of the table racks
125
later.
As shown in
FIG. 36
, a feed frame
126
supporting the vacuum chuck conveyor
114
, the tape racks
125
and so on is connected to a base frame
127
so as to be swingable with a fulcrum shaft
128
extending in a horizontal direction, located in the middle of the feed frame
126
as a fulcrum. A piston rod
131
of cylinder
130
as an actuator swingably mounted on the base frame
127
through a shaft
129
is connected with back end side of the conveyor
114
of the feed frame
126
and the feed frame
126
is swingable as a whole through a predetermined angle in directions, upward or downward, in a vertical plane by contracting or stretching of the piston rod
131
of the cylinder
130
. Such a movement is to increase a tension in the tape T when the tape is disconnected as will be described later.
The base frame
127
can move over a predetermined distance along guide rails
133
disposed in a horizontal direction. The base frame
127
further can self-propelled in a forward or backward direction by a driving force of a motor
134
with reduction gears
135
mounted on the base frame
127
. With such a construction, the distal end of the vacuum chuck conveyor
114
can move to or away from the veneer roll
9
.
As shown in
FIG. 37
, a vertical frame
137
is erected from a floor surface
136
, a take-up reel
7
located in the center of a veneer roll
9
is supported on an elevator
138
that is shiftable upward or downward along the vertical frame
137
and as a diameter of a veneer roll
9
increases, the elevator
138
is raised and in turn the take-up reel
7
is also raised. In addition to such a type in which as a diameter of a veneer roll
9
increases, the take-up reel
7
is shifted upwardly over a corresponding distance to increase in the diameter. Another type may be adopted, in which a position of the take-up reel
7
is fixed in a vertical direction and a drive roller
6
is lowered over a corresponding distance to increase in the diameter. In the latter case, a position of the distal end of the conveyor
114
of the tape feeding unit
124
may be kept constant in position independently from increase of diameter of a veneer roll
9
. The veneer roll
9
whose diameter reaches a predetermined value is hung while supporting parts in the vicinity of bearings at both ends of the take-up reel
7
using suspension hooks (not shown) to transport to a reeling deck (not shown). A veneer sheet or sheets
1
that are eventually wound into a veneer roll
9
is transported in this scene from the veneer lathe side by means of a veneer sheet conveyor
139
.
FIG. 38
is a plan view of a part of the tape feed unit
124
in which the feed frame
126
is connected between the vacuum chuck conveyors
114
and the tape racks
125
as a cross member (in a direction perpendicular to a tape feed direction). One half (left or right half) of the tape feed unit
124
is shown in an enlarged side view of FIG.
39
and in a plan view of FIG.
40
. As shown in
FIG. 39
, a conveyor frame
140
of the conveyor
114
constitutes part of the feed frame
126
, is protruded from the body (
126
) as a cross member in a forward direction and is integrally combined with the body (the cross member). While the belt
121
of the conveyor
114
has the pulleys
119
and
120
at both ends in a longitudinal direction thereof and returns at the both ends, a guide roller
141
and a tension increasing roller
142
are provided between the both pulleys
119
and
120
. The conveyor
114
can be swingable about the shaft
143
.
The motor
123
is connected to the pulley
120
on the upstream side and the belt
121
is driven for circulation by the motor
123
. A tape rack
125
is located above the end portion on the upstream side of the circulation track of the belt
121
and the first and second roller stoppers
115
and
116
are disposed above the belt
121
in an adjacent manner to the tape rack
125
downstream therefrom. The roller stoppers
115
and
116
are freely rotatably supported by the stopper frame
144
erected from the conveyor frame
140
such that the roller stoppers
115
and
116
are arranged in a vertical direction in a predetermined spatial interval. Positions of the roller stoppers
115
and
116
can be adjusted at least in a direction upward or downward (if a need arises, in a length direction of the conveyor) by adjusting the stopper frame
144
in position relative to the conveyor frame
140
.
A tape roll rotation stop device
180
is disposed in the upstream side from the roller stoppers
115
and
116
, that is between the tape rack
125
and the roller stoppers
115
and
116
on the circulation track of the belt
121
. That is, as shown in
FIGS. 39
,
41
,
51
,
52
and
53
, a receiving member
181
is attached to the conveyor frame
140
so as to vertically erect therefrom on one side of the belt
121
in an intersecting direction of a circulation direction of the belt
121
and a support frame
182
is attached to the conveyor frame
140
on the other side thereof so as to vertically erect therefrom. A cylinder
183
as an actuator is mounted on the support frame
182
and a press member
185
is connected to the fore-end of the piston rod
184
, wherein a tape roll
113
on the belt
121
whose forward movement is blocked by the roller stoppers
115
and
116
is pressed on one side thereof by the press member
185
that is movable in a press action.
Further, the tape roll rotation stop device
180
, in addition to the above described way, can be in a configuration in which a pair of pinching members
186
and
187
that can open from or close to both sides of the upper portion of a tape roll
113
is used at an upstream position from the roller stoppers
115
and
116
as shown in FIG.
54
. That is, the support frame
182
is put up on the conveyor frame
140
so as to be erected upward from the conveyor frame
140
and a cylinder
188
as an actuator is mounted on the support frame
182
. On the other hand, the pair of the pinching members
186
and
187
that are normally closed in an engaging manner by a torsion coil spring
190
is supported in a suspension state from the support frame
182
. A support section
191
of one
187
of the pinching members
186
and
187
is connected to the fore-end of a piston rod
189
of the cylinder
188
. When a tape T is unwound from a tape roll
113
on the belt
121
which is blocked in forward movement by the roller stoppers
115
and
116
, the pair of pinching members
186
and
187
comes into an open state by action of the cylinder
188
, while when rotation of the tape roll
113
is stopped, the pair of pinching members
186
and
187
is closed by canceling the action of the cylinder
188
.
Further, the tape roll rotation stop device
180
, still in addition to the above described ways, can be in a configuration in which a press member
192
as the tape roll rotation stop device
180
is put into contact with the top surface of a tape roll
113
or separated away from the top surface thereof, wherein the press member
192
with a waiting position above a tape roll
113
is at the upstream position from the roller stoppers
115
and
116
as shown in FIG.
55
. That is, a cylinder
193
as an actuator is mounted on the support frame
182
and the press member
192
is connected to the fore-end of a piston rod of the cylinder
193
. The press member
192
can in a reciprocating manner move between a position where the press member
192
does not interfere with rotation of the tape roll
113
and a position where the press member
192
is put into contact with the top surface of the tape roll
113
, thereby enabling stoppage of the tape roll
113
.
The tape rack
125
, as shown in
FIG. 41
, comprises: a back plate
145
constituting a back section; and partition plates
146
as a plurality of partition wall sections integrally connected with the back plate
145
and spaces between the partition plates
146
are a plurality of tape housing rooms
147
. Such a tape rack
125
has not only open front side but also an open bottom side. In this example, a top side is further open, but the top side may be closed. Further, as shown in
FIG. 39
, an upright frame
148
is fixed to the feed frame
126
at a position backward from the tape rack
125
and rail engaging sections
150
formed on a back plate
145
of the tape rack
125
are mated, in a slidable manner, with a pair of guide rails
149
provided in parallel to each other in a predetermined spatial interval one above the other on the upright frame
148
. With such a configuration, the tape rack
125
is supported in a movable manner in a direction perpendicular to the transport direction of the vacuum chuck conveyor
114
above the belt
121
in the upstream side end section thereof.
A rack gear
151
is fixed between the pair of rail engaging sections
150
of the back plate
145
in a horizontal direction and a pinion gear
153
of a tact feed motor
152
fixed on the upright frame
148
is mated with the rack gear
151
. The tact feed motor
152
functions as an intermittent feed device for the tape rack
125
and intermittently moves the tape rack
125
at a pitch of tape housing rooms
147
(in other words, a pitch of partition plates
146
) in a lateral direction. In order to determine a position of the tape rack
125
in the movement, as shown in
FIG. 40
, a movement detecting section
154
in a comb shape is provided along a moving direction on the tape rack side while a proximity switch
155
is provided on the side of the upright flame
148
, wherein the proximity switch
155
detects a movement of the one pitch of the tape rack
125
and sends a detection signal to a control section of a motor to stop. It should be appreciated that the back plate
145
may be removed to open the back section of the tape housing rooms
147
. In this case, the rack gear
151
can be located in any position as far as the rack gear
151
is in an integral relation with a partition plate
146
.
It should further be appreciated that in a case where the tact feed motor
152
is a pulse motor (step motor), movement and positioning of the tape rack
125
can be determined by counting the number of pulses. Further, determination of a position of the tape rack
125
and detection of the position can also be performed using a signal of a rotary encoder, a signal from a magnescale or the like that is connected to the pulse motor. In those cases, the movement detecting section
154
and the proximity switch
155
can be removed. It should be appreciated that
FIG. 40
shows a plan view of a state in which the tape rack
125
is omitted.
In
FIG. 39
, since the lower side of the tape rack
125
is open, a tape roll
113
in a tape housing room
147
is supported spaced from a surface of the belt
121
of the vacuum chuck conveyor
114
. Therefore, two guide bars
156
and
157
are disposed at a predetermined spatial interval almost in a horizontal direction along a moving direction (a direction perpendicular to the conveyor
114
) of the tape rack
125
. The guide bars
156
and
157
are located at a height slightly above a belt surface in the upstream side end section of the conveyor
114
by means of support members
158
and
159
upwardly erected from the feed frame
126
and as shown in
FIG. 40
, the guide bars
156
and
157
respectively have one ends located at points just before intersections between the belt conveyor
114
and extensions of the guide bars
156
and
157
with the other ends outside the conveyor
114
.
In
FIG. 39
, when the tape rack
125
moves in a direction perpendicular to the sheet on which the figure is drawn, since a tape roll
113
in a tape housing room
147
is received by the guide bars
156
and
157
at the lower end portion thereof and supported at a height above the conveyor
114
, the tape roll
113
is guided to approach the conveyor
114
sideways while being in contact with the guide bars
156
and
157
.
In
FIG. 39
, a cut-way
160
, for example in a U-like shape or others, which opening gets started from the front end edge and proceeds toward the back end, is formed in the front portion of a partition plate
146
of the tape rack
125
. This cut-away is formed, for example, in order to facilitate insertion of a tape roll
113
by a worker into a tape housing room
147
of the tape rack
125
one at a time, or in order to facilitate taking-out of a tape roll
113
by a worker from a housing room
147
of the tape rack
125
when a tape roll
113
is required to be taken out for some reason. In
FIG. 41
, the cut-away is omitted.
As shown in
FIG. 42
, tape rolls
113
are accommodated in tape housing rooms of a tape rack
125
each in a standing position and the tape rolls
113
are supported by the guide bars
156
and
157
. The housing rooms
147
of the tape rack
125
are moved so as to be positioned on the belt
121
of the vacuum chuck conveyor
114
sequentially from one end thereof (in the figure, the right end) with a spatial interval of tape rolls
113
thus accommodated as a pitch.
Since the guide bars
156
and
157
run to a point just before intersections between extensions of the guide bars
156
and
157
and the belt
121
, a tape roll
113
that has moved onto the belt
121
rests on the belt
121
by stepping down from the guide bars
156
and
157
. Since the belt
121
has a down slope toward downstream and also driven in a direction toward downstream, a tape roll
113
resting on the belt
121
automatically moves toward downstream, but there are the first and second roller stoppers
115
and
116
as the forward movement stoppers as described above, wherein when the tape roll
113
is of a large diameter, a forward movement of the tape roll
113
is first blocked by the roller stopper
115
.
In this situation, the tape roll
113
is not released from the tape rack
125
but more than one half thereof still remains in a tape housing room
147
. Hence, in a state of
FIG. 43
, when the tape roll
113
gets started with unwinding, two partition plates
146
are present on both sides of the tape roll
113
and the two partition plates works as sideways control members to prevent the tape roll
113
from falling sideways. Therefore, the tape roll
113
does not fall sideways and at the same time, can rotate and unwind in the tape housing room
147
.
That is, partition plates
146
of the tape rack
125
function not only as members forming spaces for accommodate tape rolls
113
, but as sideways control members to prevent falling sideways of a tape roll
113
. In such a way, a partition plate
146
exerts two functions, which in turn, makes a structure of the tape rack
125
simple. Further, while a tape roll
113
has a pressure-sensitive adhesive layer normally on all its inner surface, there is a part of the inner surface at the starting end with no pressure-sensitive adhesive layer, the part is vacuum chucked on the belt
121
and thereby, unwinding can smoothly get started. When unwinding of one tape roll
113
is finished, the tape rack
125
is moved by one pitch and the next tape roll
113
is brought onto the belt
121
of the conveyor
114
similar to the preceding tape roll
113
, thereafter followed by procedures similar to the above described way.
As shown in
FIG. 43
, description is made above such that there is a clearance of a height slightly larger than a diameter of a core
112
of a tape roll
113
between the roller stopper
116
in the lower side and the upper surface of the belt
121
. When process reaches a time point that unwinding of a tape roll
113
is close to finish, the rest of the tape roll
113
with a residual tape passes under the roller stopper
116
to run toward downstream. The core stopper
117
(see FIG.
34
), which is located at a position spaced apart from roller stopper
116
downstream, is provided as a stopper at a higher position above the belt
121
. Therefore, after the tape roll
113
with some length of the tape remaining on the core hits the core stopper
117
, the remaining tape T is unwound from the core
112
to nothing thereon while being rotated. It should be appreciated that at this point, another new tape roll
113
waits its turn in the rear and therefore, a tape unwound from the new tape roll
113
and a final part of the tape unwound from the tape roll
113
with a short length of the tape remaining on its core
112
are fed temporarily in a simultaneous manner.
A stopper surface
161
of the core stopper
117
has a three-dimensional inclination and faces not only upstream with a slope but opens sideways. Hence, a core
112
that hits the stopper surface
161
is blocked in its advancement downstream and at the same time receives a force sideways as if by an action of a cam surface. Around the core stopper
117
, as shown in
FIG. 44
, a door
162
is provided such that it can open or close sideways with a axial line O extending almost vertically from upward to downward as a fulcrum. A piston rod
165
of a cylinder
164
as opening/closing drive means is connected to the door
162
with a bracket
163
interposed therebetween and a base end of the cylinder
164
is fixed at a side surface of the feed frame
126
with the help of a pin
167
and the bracket
168
.
Further, as shown in
FIG. 45
, when the piston
165
retreats into the cylinder
164
, the door
162
opens sideways to form an opening
169
to the side toward which the stopper surface
161
of the core stopper
117
faces. Since the core
112
receives a lateral force directing sideways from the stopper surface
161
, it can be discharged in the direction through the opening
169
. In the embodiment, in order to ensure the discharge sideways of the core
112
, a catching bar
170
is provided to the door
162
as a discharge member to be used for forcibly discharging the core
112
while catching. The catching bar
170
is fixed to the door
162
at almost a right angle such that it extends from the door
162
at a height above the upper surface of the belt
121
of the conveyor
114
. The catching bar
170
has a shape such that when the core
112
comes to the stopper surface
161
under the catching bar
170
, the fore-end of the catching bar
170
further extends beyond the distal end of the core
112
and then is bent downward to form a hook portion
171
(see FIG.
46
). When the door
162
opens, the hook portion
171
of the catching bar
170
catches the distal end of the core
112
and discharges the core
112
sideways while turning laterally, following swing movement of the door
162
.
With such a mechanism, since the core
112
does not remain but can automatically be removed, a continuous feed of a tape T can be ensured with ease. In the embodiment, as described above, a core discharge unit
172
is constructed of the stopper surface
161
, the door
162
, the catching bar
170
and the cylinder
164
that works in opening and closing the door
162
.
As shown in
FIG. 36
, a tape twist preventive mechanism
173
is provided at the distal end of the conveyor
114
to feed a tape T and the mechanism
173
prevents the tape from being twisted (upside down) in the course of taking into between veneer sheets. In the twist preventive mechanism
173
, a spatula-like member
174
protrudes such that the fore-end thereof intersects the running route of the tape T that is taken into between veneer sheets at an acute angle as shown in
FIG. 47
, wherein the intersection is realized in a spatially relative way. Further, the base end of the spatula-like member
174
is fast held at a piston rod
177
of a cylinder
175
as a moving means for the base end of the spatula-like member
174
. The cylinder
175
is fixed on the lower side of the feed conveyor
126
with a bracket
176
interposed therebetween. As shown in
FIG. 48
, the spatula-like member
174
touches the lower surface of the running tape T while positioning above a veneer sheet
1
fed from the veneer lathe side described above to control an angle of the running tape T in a lateral direction of the tape T.
FIG. 49
shows an example of the spatula-like member
174
as viewed above and the member has a contact surface of a plate with a width more or less larger than that of the tape.
FIG. 50
shows a state in which the spatula-like member
174
functions such that the spatula-like member
174
pushes up the tape onto the lower surface to correct a twist of the tape T.
As shown in
FIGS. 39 and 40
, a tape cutting unit
195
is provided at the distal end of the conveyor
114
for feeding. The tape cutting unit
195
comprises: a bracket
196
protruding from the distal end of the conveyor frame
140
for the feed conveyor
114
; a support member
197
fixed to the bracket
196
; and a tape cutting tool
198
held by the support member
197
. The tape cutting tool
198
has a cutting section extending in a direction intersecting the tape feed direction. As shown in
FIG. 56
, the cutting section is formed such that the top portion has protrusions, preferably sawteeth. The cutting section touches the tape surface with the sawteeth in a sliding manner.
In the tape cutting, as shown in
FIG. 57
, the conveyor
114
is swung upwardly about the fulcrum axis
128
that shown in
FIG. 36
as a fulcrum by the action of the cylinder
130
through a predetermined angle such that the tape cutting tool
198
is at least raised and the cutting section thereof is put into sliding contact with the lower surface of the tape. With this swing of the conveyor
114
, as shown in
FIG. 57
, the tape T receives a tension larger than in a normal condition.
Further, the tape cutting unit
195
can assume a configuration as shown in
FIGS. 58
to
63
. That is, a tape cutting unit
195
, as shown in
FIG. 59
, comprises: a bracket
199
that protrudes sideways from the feed frame
126
; a cylinder
200
for moving a tape cutter
201
, fixed to the bracket
199
; the tape cutter
201
(of a disk shape in this case, hereinafter referred to as cutter) connected to a piston rod of the cylinder
200
; and a tape receiving member
202
that is used to pinch and cut the tape T with cooperation of the disk-like cutter
201
in the vicinity of the cutter
201
such that the tape T does not escape from the cutter
201
. In the example, the tape receiving member
202
has a shape of a cylindrical shaft and is fixedly held by a bracket
203
at the distal end of the feed frame
126
(the distal end of the conveyor
114
) in a direction perpendicular to the tape feed direction at a position very close to the tape running route. Further, there is provided a guide roller
204
that freely rotates and guides running of the tape T in idling contact with the lower surface of the tape T at the tip of the distal end of the conveyor
114
upstream from the tape receiving member
202
in an adjacent manner thereto (at a directly forward position of, upstream from the tape receiving member
202
).
As shown in
FIG. 61
, the cutter
201
is moved in a lateral direction toward the tape receiving member
202
and thereby, cuts the tape T while rotating in the width direction. In the cutting, as shown in
FIG. 60
, the conveyor
114
swings upward with a fulcrum shaft
128
shown in
FIG. 36
as a fulcrum through a predetermined angle by the action of a cylinder
130
such that the tape receiving member
202
is raised and gives the tape T a tension. With this movement of the conveyor
114
, as shown in
FIG. 60
, the tape T is given a tension larger than in a normal condition and the disk-like cutter
201
is cut in the tape T in such a tense state, thereby, cutting the tape T with ease.
A surface of the tape receiving member
202
is made at least from a soft material such as urethane rubber and a blade edge of the cutter
201
is cut in the surface. A shape of the tape receiving member
202
may be a plate, but a shaft-like member such as a cylinder as in this example is preferred since a receiving portion of the tape receiving member
202
can periodically be changed by rotation of the member so as to disperse a cutting-in position over the member with the result that it is avoided that the tape receiving member
202
is locally deteriorated due to concentrated use at a limited position and a lifetime of the member can be elongated.
It should be appreciated that as shown in
FIG. 62
, a cylinder
200
for swinging a disk-like cutter
201
is mounted on a bracket
199
with a fulcrum shaft
205
as a fulcrum for swinging the cylinder
200
such that the disk-like cutter
201
is freely cut in the tape receiving member
202
, wherein the fore-end of a piston rod
207
of the cylinder
200
can be connected to a base frame that supports the cylinder
200
for moving a cutter. In this case, the piston rod
207
of the cylinder
206
for swinging a cutter is extended such that a working point of the cutter
201
can cut into the tape receiving member
202
to some extent before or during the lateral movement of the disk-like cutter
201
and in the state, the disk-like cutter
201
is moved in the width direction of the tape T to ensure cutting of the tape T.
Alternatively, as shown in
FIG. 63
, an elastic member
208
such as a spring or rubber can be mounted between the bracket
199
and the base frame supporting the cylinder
200
for moving a cutter and thereby, the disk-like cutter
201
can cut into the tape receiving member
202
with the fulcrum shaft
205
as a fulcrum. In this case, since the working point of the cutter
201
can intrude into the tape receiving member
202
all the time because of use of the elastic member
208
, when in this state, the disk-like cutter
201
traverses the tape T in a lateral direction, the tape can be sure to be cut.
Following is description of the whole of operations associated with the tape feeding unit.
When tape rolls
113
are set in the tape rack
125
as in
FIG. 41
, the tape rack
125
is laterally moved by the motor
152
and a first tape housing room
147
is located on the belt
121
of the conveyor
114
, then as in
FIGS. 42 and 43
, a tape roll
113
steps down from the guide bars
156
and
157
and rests on the belt
121
and moves downstream over a small distance till the roll hits the first roller stopper
115
. At the position, the tape T is unwound from the tape roll
113
by the vacuum chuck conveyor
114
and the tape roll
113
is rotated to unwind the tape T in company with rotation of the first roller stopper
115
.
Especially, in starting of winding a veneer sheet
1
on the take-up reel
7
, the tape T comes to be twisted upside down with ease and as shown in FIG.
48
. When such a twist occurs in the tape T, then the spatula-like member
174
advances from the cylinder
175
to correct or prevent twist of the tape T, the spatula-like member
174
is kept at the position after the advancement for a predetermined short time as it is and thereafter the spatula-like member
174
retreats therefrom to restore its original position. Further, while a twist is frequently experienced at starting of the winding, even when the tape T is unwound from a tape roll
113
and runs toward and is inserted into between veneer sheets
1
in a normal state, there is frequently encountered, in the course of insertion, a phenomenon that the tape T is twisted from the normal state by turning upside down. Therefore, operations in which the tape T is pressed onto a surface of the tape roll
9
by the spatula-like member
174
are preferably repeated continuously and regularly till the tape is broken from when the tape T gets started with insertion into between veneer sheets.
As a tape roll
113
is smaller in diameter in the course of unwinding of the tape T, the tape roll
113
comes to get into contact with the second roller stopper
116
as shown in FIG.
43
and unwinding continues while the stopper
116
is rotated. At the last stage, when a diameter of the tape roll
113
comes to be smaller than that of the clearance under the second roller stopper
116
, then the core
112
moves downstream through under the second roller stopper
116
together with a residual tape of a small amount thereon and after the movement is stopped by the core stopper
117
of
FIG. 34
, the tape roll
113
rotates and is unwound there till nothing on the core
112
, though, for a short time.
Thereafter, as shown in
FIGS. 44
to
46
, the piston rod
165
of the cylinder
164
retreats, the door
162
opens, the catching bar
170
forcibly discharges the bare core
112
in the course of opening the door
162
toward the side of the conveyor
114
, and then the door
162
closes.
A predetermine time period before the discharge of the bare core
112
, the tape rack
125
of
FIGS. 41 and 42
performs a lateral movement over a distance corresponding to one pitch of arrangement of the tape housing rooms
147
to feed a next tape roll
113
onto the conveyor
114
and the next roll
113
starts unwinding the tape T as shown in FIG.
43
. In this situation, as shown
FIG. 34
, when the tape T is still fed from an unwound residue on the preceding tape roll
113
by the core stopper
117
, the tapes are doubly fed, though, for a short time period till the residue is unwound to nothing.
A tape rotation stop device
180
at an upstream position from the forward movement stopper member is activated, when a reeling operation is terminated since a diameter of a veneer roll
9
of a veneer sheet
1
have reached a predetermined value in the course of unwinding of the tape roll
113
, or when a reel operation is interrupted in order to change a thickness of a veneer sheet
1
according to a nature and condition of a log. The cutting section of the tape cutting tool
198
is put into sliding contact with the lower surface of the tape T before rotation of the tape roll
113
is ceased. To be concrete, the tape feeding unit
124
is swung through a small angle as a whole counterclockwise in the figure with the shaft
128
of
FIG. 36
as a fulcrum by retreat of the piston rod
131
of the cylinder
130
. With the movement of the tape feed unit
124
, as shown in
FIG. 57
, the tape cutting tool
198
at the distal end of the conveyor
114
raises the tape T to make the sawteeth as the top portion of the cutting section touch the lower surface of the tape T in a sliding manner. It should be appreciated that the sawteeth as the top portion and the lower surface of the tape T unwound may be kept in sliding contact with each other all time from when the tape T is inserted into between veneer sheets to wind on the take-up reel
7
into a tape roll
9
. If, likewise, the sawteeth of the cutting section and the lower surface of the tape T are constantly in sliding contact with each other, there can be enjoyed a additional effect that the sawteeth as the top portion of the cutting section are sharpened by a frictional condition generated from the sliding contact with the tape T.
As shown in
FIG. 51
, when a forward movement of the tape roll
113
placed on the belt
121
is blocked by the roller stoppers
115
and
116
, and the tape T is unwound from the tape roll
113
, rotation of the tape roll
113
is stopped. In order to stop rotation of the tape roll
113
, as shown in
FIG. 52
, the cylinder
183
is activated to move the press member
185
in a direction intersecting a direction of tape unwinding and stops the tape roll
113
by pressing the tape roll
113
between the press member
185
and the receiving member
181
located on the other side of the tape roll
113
from the press member
185
.
While driving of a veneer lathe is also stopped almost in synchronism with rotation stoppage of the tape roll
113
, the take-up reel
7
continues to inertial rotation in the veneer sheet reeling position. Therefore, the tape T is pulled toward the take-up reel
7
in inertial rotation independently from the stoppage of unwinding the tape T from the tape roll
113
and thereby, tension in the tape T is further increased. The tape T whose tension is increased is broken at the weakest point thereof, that is a point where the cutting section of the tape cutting tool
198
is pressed into the tape T on the lower surface thereof. Further, since rotation of the tape roll
113
is stopped and thereby the tape T is not unwound from the tape roll
113
, the fore-end portion of the broken tape T is left at the cutting section and awaits next time unwinding of the next tape T.
Further, in order to increase the tension in the tape T, another method is available in addition to the inertial rotation described above: As shown in
FIG. 36
, the base frame
127
supporting all the tape feeding unit
124
is retreated along the guide rails
133
in a horizontal direction by driving of the motor
134
over a predetermined distance and thereby, the vacuum chuck conveyor
114
can be separated spaced from the veneer roll
9
as well. This can be replaced with an operation to further raise a position of the tape cutting tool
198
in sliding contact with the lower surface of the tape T. This operation can be performed in such manner that the piston rod
131
of the cylinder
130
is withdrawn and thereby, swings the entire tape feeding unit
124
with the shaft
128
of FIG
36
as a fulcrum counterclockwise through a small angle from the position in sliding contact with the lower surface of the tape T of the tape cutting tool
198
.
Further, in order to stop rotation of the tape roll
113
, as shown in
FIG. 54
, a method may be adopted: While a pair of the pinching members
186
and
187
are in an open state by action of the cylinder
188
when the tape T is unwound, the pair of the pinching members
186
and
187
is closed in a direction intersecting a unwinding direction of the tape roll
113
so as to pinch the tape roll
113
from both sides thereof by canceling the action of the cylinder when rotation of the tape roll
113
is stopped.
Still further, in addition to the above descriptions, another method may be adopted in order to stop rotation of the tape roll
113
, as shown in
FIG. 55
, while the press member
192
is withdrawn (upward) at a position for waiting where no interference with rotation of the tape roll
113
occurs in unwinding of the tape T, the press member
192
is pressed down to a position where the member gets into contact with the top surface of the tape roll
113
by action of the cylinder
193
and the tape roll
113
is then pressed between the press member
192
and the vacuum chuck conveyor
114
.
According to this method, when reeling of a veneer sheet is interrupted in the middle of winding or finished, the tape T can be cut while keeping the cutting section of the tape cutting tool
198
in sliding contact with the tape at a position where the tape cutting tool
198
is positioned by ceasing rotation in unwinding of the tape roll
113
. Hence, the tape roll
113
in rotation in a following manner to a winding speed is not necessary to be slowed and stopped temporarily. Especially, in case of logs that cause frequent terminations in winding operation by interruption due to defects included therein regardless a large diameter thereof or short time operations due to smallness in diameter, operation efficiency can be increased with adoption of this method.
Further, description will be made in a case of tape cutting using a disk-like cutter
201
: As a preparatory operation, the tape feeding unit
124
is swung as a whole counterclockwise in the figure through a small angle by extension of the piston rod
131
of the cylinder
130
with the shaft
128
of
FIG. 36
as a fulcrum to raise the distal end of the conveyor
114
as shown in FIG
60
, with the result that a tension larger than in a normal condition is produced in the tape T. The tape T in such a high tension state is cut by the disk-like cutter
201
in a state in which the disk-like cutter
201
is pressed into the tape receiving member
202
and after the cutting, the disk-like cutter
201
retreats. Thereafter, the entire tape feeding unit
124
is swung back through the small angle clockwise to restore it original position, while the conveyor
114
is returned downward through the small angle.
While in the above descriptions, the tape rack moves laterally, another configuration may be available: A tape case in which one tape roll is accommodated is fixedly installed above a feed conveyor and the front, bottom and back (or top) sides thereof are opened and not only a forward movement stopper member is provided in front thereof, but a new tape roll
113
is supplied from behind or above of the tape case. Further, another operations are also allowed: The vacuum chuck conveyor
114
is employed only in the initial stage of starting winding the tape T on the take-up reel
7
or veneer roll
9
, while when the tape T is unwound from the tape roll
113
by a pulling force of the veneer roll
9
, vacuum of the vacuum chuck conveyor
114
is broken and circulation thereof is not driven (all mechanisms thereof are stopped), or the vacuum is broken but the circulation is still in operation (no reduced pressure is applied).
Next, descriptions will be made of an embodiment of a veneer roll unwinding apparatus of the invention with reference to the accompanying drawings:
A first description of a veneer roll unwinding position
211
gets started with an example of an unwinding process for a veneer sheet
1
with reference to
FIGS. 64 and 65
. A transfer frame
210
having an easy down slope is installed toward a pair of reel supports
65
disposed, left and right, at the terminal end of a veneer roll stock area
3
A and bearings at both ends of a take-up reel on which the take-up reel
7
with a veneer roll
9
thereon is supported are placed on the transfer frame
210
. Reel receivers
8
rotatably supporting the both end bearings are disposed inside the pair of reel supports
65
downstream from the transfer frame
210
and reel down-pressers
66
that can freely swingable relative to the top portion of the bearings of the reel receivers
8
are disposed above the reel receivers
8
.
A support table
213
is provided on both sides a machine frame
212
in a direction perpendicular to the transport direction thereof, in the upstream side from the unwinding position
211
, and placed below the transfer frame
210
. A support shaft
215
is received by bearings
214
mounted on the support table
213
and a plurality of base end pulleys
216
each of a large diameter are fixedly attached to the support shaft
215
along the shaft direction thereof at arbitrary spatial intervals. Pairs of support arms
217
are swingably supported on the support shaft
215
for the base end pulleys
216
at both sides of the respective base end pulleys
216
, wherein each of the pair of support arms
217
is bent in a middle region with the distal end displaced upwardly. Each of distal end pulleys
209
each of a small diameter are rotatably supported between the distal ends of a pair of the support arms
217
and not only do drive guide bands
218
respectively extend over the base end pulleys
216
and the distal end pulleys
209
, but the pairs of support arms
217
are commonly connected to a connection beam
219
at arbitrary positions of the respective support arms
217
. Both ends of the connection beam
219
are mounted on the piston rods
221
of fluid cylinders
220
swingably supported on the machine frame
212
.
An auxiliary frame
222
is provided at a position opposite to the base end pulleys
216
in the upstream side thereof on the machine frame
212
and has an opposite surface to the base end pulleys
216
which surface has a profile of an arc expanded along the curvature of the base end pulleys
216
, and a fold-back guide member
224
whose belts extend over three pulleys
223
all of which are supported by the auxiliary frame
222
and runs along the base end pulleys
216
. A fold-back conveyor
226
is disposed directly below the fold-back guide member
224
to connect to the fold-back guide member
224
and constituted of a plurality of belts that extend between a pair of shafts
225
supported on the machine frame
212
at two points, upstream and downstream in the transport direction thereof.
A chain
229
extends between a chain wheel
227
mounted on one side of the support shaft
215
and a motor
228
disposed on the machine frame
212
, the drive guide bands
218
are controlled counterclockwise in the
FIG. 64
in a freely rotatable manner and the fold-back guide member
224
guarantees an upside-down motion of a pinched veneer sheet
1
in cooperation with the drive guide bands
218
.
The drive guide bands
218
, which are arranged in plural rows in a direction perpendicular to the transport direction, are freely swingable with the support shaft
215
as a fulcrum such that the distal end pulleys
209
, which are free ends, move to or away from the veneer roll
9
in company with extending or contacting the piston rod
221
of the fluid cylinder
220
. Thereby, the drive guide bands
218
can freely move to or away from the lower portion of the outer circumferential surface of the veneer roll
9
. In unwinding a veneer sheet
1
from the veneer roll
9
, a fluid is fed through a backward port of the fluid cylinder
220
to extend the piston rod
221
in the most contracted position and thereby, the drive guide bands
218
in plural rows are put into press contact with the lower portion of the circumferential surface of the veneer roll
9
supported by the reel receivers
8
at both side ends thereof.
Then, when the drive guide bands
218
are swung counterclockwise in
FIG. 64
by a driving force of the motor
228
, the drive guide bands
218
are put into a press contact with the veneer roll
9
and a free end of a veneer sheet
1
of the veneer roll
9
is unwound by a frictional force of the drive guide bands
218
and guided to the fold-back guide member
224
in a state in which the veneer sheet
1
is transferred and carried on the drive guide bands
218
. In this situation, the fold-back conveyor
226
is controlled at almost the same speed as those of the drive guide bands
218
and the transport conveyor for a veneer dryer in the downstream side and receives the veneer sheet
1
that is moved along the curvature of the fold-back guide member
224
which is turned upside down between the drive guide bands
218
and the fold-back guide member
224
. After such a pinched upside-down motion, the veneer sheet
1
is transported to the veneer dryer from the fold-back conveyor
226
.
Then, description will be made of another embodiment of a fold-back motion of a veneer sheet
1
that is transported on the drive guide bands
218
with reference to
FIGS. 66
to
69
. It should be appreciated that this embodiment of a fold-back motion is preferably employed for a fold-back transportation cut from a conifer log or the like that has neither expandability nor contractibility in a direction intersecting fiber orientations of a veneer sheet, that is easy to be broken or torn when a tension is applied in a direction intersecting fiber orientations.
First, in
FIG. 66
, relay pulleys
284
are mounted on the support shaft
215
in an independently rotatable manner with bearings in positions close to the base end pulleys
216
and the relay pulleys
284
have a larger diameter than a diameter of the base end pulleys
216
. The relay pulleys
284
are preferably in plural number in a freely idling manner on the support shaft
215
in an adjacent manner to the base end pulleys
216
and the upper portion of the circumferential surface of each relay pulley
284
is at least higher than the transport surface of each drive guide bands
218
. A veneer sheet in transportation on the drive guide bands
218
is transferred to the relay pulleys
284
during a folding-back motion.
Fold-back guide members
224
is disposed on the opposite side to fold-back sections of the relay pulleys
284
. It is preferable that in the fold-back guide members
224
, the auxiliary frame
222
has an opposite surface to the relay pulleys
284
which surface has a profile of an arc extended along the curvature of the relay pulleys
284
and erected on the machine frame
212
. Pulley
223
a
are disposed in the top portion of the auxiliary frame
222
whose profile is almost of a triangle, pulleys
223
b
are disposed at the left corner of the lower portion thereof and pulleys
223
c
are disposed in the protrusion of the lower portion thereof. Endless bands extends over the three type pulleys
223
a
,
223
b
and
223
c
in a winding manner. The endless bands extending over the three sets of pulleys
223
a
,
223
b
and
223
c
are provided in number corresponding to the number of the relay pulleys
284
at positions respectively corresponding to the positions at which the respective relay pulleys
284
in an opposite manner. The endless bands are in plane contact with part of the circumferential surfaces of the relay pulleys
284
on the veneer sheet fold-back side in a sliding manner. The veneer sheet is externally pressed from both sides thereof when the veneer sheet is folded backed on the replay pulleys
284
while the veneer sheet
1
is kept in sliding contact with an outer circumferential surface on the fold-back sides of the relay pulleys
284
.
Each set of the pulleys
223
a
,
223
b
and
223
c
, for example the pulleys in the left corner of the lower portion are fixed on a pulley shaft
285
thereof. A chain wheel
286
mounted at one side of the pulley shaft
285
and a motor
228
disposed on the machine frame
212
are wound by a chain
287
and the fold-back guide member
224
is controlled at almost the same speed as a transport speed of a veneer sheet
1
transported on the drive guide bands
218
counterclockwise in
FIG. 66
in a freely circulating manner.
The drive guide bands
218
arranged in plural rows in a direction perpendicular to the transport direction make distal end pulleys
209
that are disposed at free ends freely swingable in the direction toward a veneer roll
9
in company with extension or contraction of the piston rod
221
of the fluid cylinder
220
and thereby, the drive guide bands
218
can freely move to or away from the lower portion of the outer circumferential surface of the veneer roll
9
. In unwinding a veneer sheet
1
from the veneer roll
9
, a fluid is fed through a backward port of the fluid cylinder
220
to extend the piston rod
221
in the most contracted position and thereby, the drive guide bands
218
in plural rows are put into press contact with the lower portion of the circumferential surface of the veneer roll
9
supported by the reel receivers
8
at both side ends.
Then, when the drive guide bands
218
are swung counterclockwise in
FIG. 66
by a driving force of the motor
228
, a free end of a veneer sheet
1
of the veneer roll
9
is unwound by a frictional force of the drive guide bands
218
and transferred and carried on the drive guide bands
218
. When the veneer sheet
1
unwound is transported to reach the fold-back section, the veneer sheet
1
is transferred to the relay pulleys
284
from the drive guide bands
218
and receives a driving force of the endless bands of the fold-back guide member
224
to turn upside down while being pinched and folded back between the relay pulleys
284
and the endless bands.
It should be appreciated that in order to fold back and turn upside down a veneer sheet
1
that is pinched between the relay pulleys
284
and the endless bands, the relay pulleys
284
can be driven instead of driving the endless bands. For example, as shown in
FIG. 68
, a shaft
290
of touch rolls
289
whose shaft direction is in parallel to the support shaft
215
is rotatably supported on a shaft
288
disposed on the right side of the support table
213
. The touch rolls
289
touch the circumferential surfaces of the relay pulleys
284
that are mounted of the support shaft
215
in a freely idling manner. When the touch rolls
289
receives a driving force of the motor
228
and are rotated clockwise in
FIG. 68
, then the relay pulleys
284
are rotated counterclockwise in FIG.
68
and the veneer sheet
1
can be turned upside down by folding back with the endless bands of the fold-back guide member
224
and the relay pulleys
284
while pinching therebetween.
Further, in
FIG. 69
, there is shown still another embodiment of a fold-back motion of a veneer
1
unwound from a veneer roll
9
. According to the embodiment, the apparatus comprises: Drive guide bands
218
on which a veneer sheet
1
is transported; and a connection conveyor
291
that is provided in a predetermined spatial interval, wherein the terminal end in the transport direction of the connection conveyor
291
serves as a fold-back position of the veneer sheet
1
. Connection pulleys
293
are respectively fixed on a connection shaft
292
along the shaft direction at positions corresponding to the base end pulleys
216
fixed on the support shaft
215
and endless bands such as belts extend between the base end pulleys
216
and the connection pulleys
293
. Further, relay pulleys
284
are rotatably supported on the connection shaft
292
with bearings or the like in close positions of the connection pulleys
293
and a diameter of each of the relay pulleys
284
is larger than that of each of the connection pulleys
293
. It is preferable that the relay pulleys
284
are disposed adjacent to the connection pulleys
293
on the connection shaft
292
in plural number and the uppermost part of the circumferential surface of each of the relay pulleys
284
is at least higher than the transport surface of the connection conveyor
291
. Furthermore, the fold-back guide member
224
is disposed that is described above on the opposite side of the fold-back section of the relay pulleys
284
and the fold-back guide member is in sliding contact with the circumferential surface of the veneer sheet fold-back side of the relay pulleys
284
.
In such a way, since the transport speed of each of the drive guide bands and a speed at which a veneer sheet
1
is folded back between the endless bands constituting the fold-back guide member
224
and the relay pulleys
284
are controlled to be almost the same, there is no chance where the veneer sheet
1
is pulled in a direction intersecting fiber directions thereof in company with control of a circumferential speed in the fold-back motion. Hence, no excessive concentration of tension arises at the starting position A of unwinding of a veneer sheet
1
from a veneer roll
9
caused by the drive guide bands
218
, thereby preventing breaking and tearing in the fiber direction of a veneer sheet
1
at the unwinding starting position from occurring.
A veneer sheet
1
that has been folded back while pinching between the endless bands and the relay pulleys
284
comes onto the fold-back conveyor
226
while turning upside down. In this situation, the fold-back conveyor
226
are controlled at almost the same speed as the speeds of the drive guide bands
218
, the fold-back guide member
224
and the transport conveyor of the veneer dryer, receives the veneer sheet
1
that proceeds along the curvature of the fold-back guide member
224
, is turned upside down between the drive guide bands
218
and the fold-back member
224
while pinching therebetween and eventually sends the veneer sheet
1
to the veneer dryer from the fold-back conveyor
226
.
The drive guide bands
218
are always kept in a state in which the drive guide bands
218
are in press contact with a lower portion of the circumferential surface of a veneer roll
9
in company with extension of the fluid cylinder
220
and as a diameter of the veneer roll
9
is reduced in the course of unwinding of a veneer sheet
1
, the pairs of support arms
217
are swung counterclockwise in
FIG. 64
with the base ends pulleys
216
as a fulcrum such that the distal end pulleys
209
side moves counterclockwise in FIG.
64
. While each of the drive guide bands
218
is of a belt type that extends over a base end pulley
216
and a distal end pulley
209
in an endless manner, both pulleys
216
and
209
are not of the same diameter as each other but a base end pulley
216
is larger in diameter than a distal end pulley
209
. Therefore, when the drive guide bands
218
are pressed on the lower portion of the circumferential surface of the veneer roll
9
, there arises a spatial margin corresponding to a difference between diameters of both pulleys
216
and
209
, which can make the drive guide bands
218
press a lower portion of the circumferential surface of the veneer roll
9
over a surface area extending in the reel shaft direction with a width. With such a pressure over the surface area, a contact area between the drive guide bands
218
and of the lower portion of the veneer roll
9
increases, which in turn enables more of a frictional force to be produced, with the result that the veneer sheet
1
can be unwound from the veneer roll
9
in a stable manner. Further, since the base end pulleys
216
each has a large diameter, a fold-back diameter of the veneer sheet
1
increases, which realizes smooth transportation of the veneer sheet
1
in folding back motion. Besides, since the support arms
217
are bent in the middle regions thereof with the distal end thereof displaced upward, there can be avoided inconveniences that the upper tracks of the drive guide bands
218
touch and interfere with the corresponding support arms
217
, between lower and upper surfaces, or thereby the drive guide bands
218
stop circulation thereof as a diameter of the veneer roll
9
is reduces, making unwinding of a veneer sheet
1
from a veneer roll
9
ensured.
Then, description will be made of an embodiment where a veneer sheet
1
is unwound while threads
12
that were wound as guide are recovered, wherein there is a case where the threads
12
are wound on a take-up reel
7
together with a veneer sheet
1
in a plural rows arranged at arbitrary spatial intervals along the shaft direction of the take-up reel
7
. As shown in
FIGS. 70 and 71
, not only is a unwinding roller
230
of a single cylinder supported on a shaft thereof in front of the connection beam
219
downstream side therefrom, but a motor
231
is provided at an end of the shaft. On the other hand, fluid cylinders
233
for respectively driving a plurality of unwinding rollers
235
with a same diameter cylinder to move to or away from the unwinding roller
230
are provided between the pairs of support arms
217
on a receiving frame
232
over the pairs of the support arms
217
in the vicinity of the distal ends of the respective pairs of support arms
217
. Further, piston rods
234
of the fluid cylinders
233
supports the respective unwinding rollers
235
at fore-ends thereof in a rotatable manner.
As described above, not only are the plurality of drive guide bands
218
put into contact with the lower portion of the circumferential surface of the veneer roll
9
, but the short unwinding rollers
235
are moved toward the long unwinding roller
230
by extending the piston rods
234
of the fluid cylinders
233
mounted on the receiving frame
232
. Portions near the fore-ends of the plurality of threads
12
that are wound on the veneer roll
9
in arbitrary spatial intervals in the shaft direction thereof and which hang down from the circumferential surface of the veneer roll
9
are taken up and pinched between the rollers
230
and
235
in the course of movement of the short unwinding rollers
235
.
Then, not only are the drive guide bands
218
circulated counterclockwise in
FIG. 70
by a driving force of the motor
228
, but the long unwinding roller
230
is controlled in synchronism with the drive guide bands
218
and the both rollers
230
and
235
are rotated in opposite directions, with the result that the threads
12
that have been wound on the veneer roll
9
as guide are unwound in company with the veneer sheet
1
unwound from the veneer roll
9
. The threads
12
are wound on thread reels in synchronism with unwinding of a veneer sheet
1
from the veneer roll
9
. Therefore, the veneer sheet
1
that has been transferred thereto and is now transported thereon is guided to the fold-back guide member
224
and sent to the veneer dryer similar to the above description, while the threads
12
unwound while pinching are recovered in a recovery box
236
disposed direct below the veneer roll
9
.
Next, description will be made of another embodiment in which the threads
12
are recovered with reference to
FIGS. 72 and 73
. A pair of horizontal beams
237
are provided below the transfer frame
210
and respectively extend toward the pair of the reel supports
65
at a spatial interval between the horizontal beams
237
. A pair of timing belts
239
each extend over pulleys
238
that are rotatably supported at the forward and backward ends of a horizontal beam
237
. The pair of timing belts
239
are synchronized with each other by a connection shaft
240
and not only are the timing belts
239
circulated in one direction or the other by driving forward or backward of a motor with reduction gears but a motion of each timing belt
239
is controlled with the help of the pulse generator included in the motor
241
.
Linear ways
242
each are laid along the transport direction of a timing belt
239
between the both tracks, upper and lower, of the timing belt
239
and linear blocks
243
are attached on the respective timing belts
239
. A travel member
244
is mounted between the linear blocks
243
in a direction perpendicular to the transport direction and a plurality of support members
245
are disposed in a direction perpendicular to the transport direction on the travel member
244
at spatial intervals each in a protruding state. Grasping members
246
each with a two-way forked end are provided at fore-ends of the support members
245
, wherein each two-way forked end can freely be opened or closed, and nozzles
247
are each disposed on the lower surface of a support member
245
with the tip end of a nozzle
247
located close a grasping member
246
. The nozzles
247
communicate with a blower
240
through respective air ducts
248
.
On the other hand, not only are a plurality of thread reels
251
corresponding to the threads
12
supported on a frame
250
erected from the machine frame
212
downstream from the unwinding position
211
, but the thread reels
251
are connected to the motors
253
through respective torque limiters
252
. Further, thread guides
255
are each mounted on a body
254
of a thread reel
251
so as to cover almost along a semi-circumference of the body
254
with a gap therebetween.
According to the above described embodiment, when the timing belts
239
are in a normal direction circulated by driving of the motor
241
with reduction gears, the linear blocks
243
advance on the linear ways
242
in a sliding manner. When the travel member
244
mounted on the linear blocks
243
reaches in the neighborhood of a forward movement limit, the opened grasping members
246
mounted on the travel member
244
come to states in which each of the members
246
can grasp a thread
12
at the middle of a hanging length thereof hanging from the circumferential surface of the veneer roll
9
, wherein the plurality of threads
12
, as guide, are wound on the veneer roll
9
at arbitrary spatial intervals along the shaft direction of the veneer roll
9
. Then, after the grasping members are closed to grasp the threads
12
in the vicinity of the tips thereof, air is ejected from the nozzles
247
mounted on the respective grasping members
246
and thereby, free fore-end portions of the threads
12
from grasping points thereof are blown away toward the thread reels
251
downstream from the respective grasping members
246
.
In this situation, the thread reels
251
are rotated counterclockwise in
FIG. 73
, the free end portions of the threads
12
in a flying condition come to below the body
254
of the respective thread reels
251
and the free end portions of the threads
12
are carried on jet streams (blown-out streams) produced in clearances between the bodies
254
and the thread guides
255
to be wound on the reel bodies
254
and entangled therewith. After a predetermined time elapses, the threads
12
are released from the grasping members
246
. Then, the threads
12
are kept in a firmly stretching state between the thread reels
251
and the veneer roll
9
by continuous rotation of the thread reels
251
, whereas since the thread reels
251
receives driving of the motors
253
through the torque limiter
252
all time, excessive loads can be avoided on the respective thread reels
251
. The threads
12
a rewound on the thread reels
251
in synchronism with unwinding of a veneer sheet
1
from the veneer roll
9
.
Under such circumstances, when the plurality of drive guide bands
218
get into contact with the lower portion of the circumferential surface of the veneer roll
9
, then the veneer sheet
1
is unwound from the veneer roll
9
and the thread reels
251
are released from an overload condition following the starting of unwinding of the veneer sheet
1
, thereby rotating the thread reels
251
. Therefore, the veneer sheet
1
that has been transferred on the drive guide bands
218
is guided to the fold-back guide member
224
and thereafter as described above, sent to the veneer dryer by way of the fold-back conveyor
226
. Further, the threads
12
that have been wound on the veneer roll
9
as guide are eventually wound on the respective thread reels
251
. It should be appreciated that while the travel member
244
moves forward or backward by moving the timing belts
239
forward or backward with driving the motor
241
with reduction gears in one direction or the other way, there is no specific limitation to this way, but the driving may be replaced with any of extension or contraction of a fluid cylinder, a rack/opinion motion, a crank motion and so on.
While description is made of the case where the thread reels
251
are fixed, an embodiment will be described next in which the thread reels
251
are freely movable forward or backward.
As shown
FIGS. 74 and 75
, a frame
250
is mounted on the linear ways
256
that are laid on both sides of the machine frame
212
with the linear blocks
257
interposed therebetween, piston rods
259
of fluid cylinders
258
mounted on the machine frame
212
are attached to the frame
250
, and the frame
250
can freely move, forward or backward, up to in the vicinity of the tips of the threads
12
arranged in plural rows, hanging from the circumferential surface of the veneer roll
9
, wherein the threads are wound on the veneer roll
9
as guide for the veneer sheet
1
at arbitrary spatial intervals along the shaft direction of the veneer roll
9
. Further, an exhauster
260
is provided above one side of the frame
250
, while suction holes (not shown) are formed in the bodies
254
of the thread reels
251
and not only does the exhauster
260
communicate with the bodies
254
of the thread reels
251
through an exhaust duct
261
but cut-aways
262
each having an wedge-like shape are formed in the fore-ends of the thread guides
255
provided along the bodies
254
of the thread reels
251
with a gap therebetween.
According to the embodiment, the frame
250
moves toward the veneer roll
9
along the linear ways
256
following extending or contracting of the piston rod
259
of the fluid cylinder
258
and when the frame
250
reaches in the vicinity of the forward movement limit
254
, the cut-aways
262
each having a wedge-like shape of the thread guides
255
are mated with portions in the vicinity of the tips of the threads
12
hanging from the circumferential surface of the veneer roll
9
, wherein the threads
12
have been wound on the veneer roll
9
in the shaft direction thereof in plural rows as guide for the threads
12
. Then, when the exhauster
260
is activated to produce an exhaust stream (suction stream) in spaces between the bodies
254
of the thread reels
251
and the thread guides
255
, the tips as free ends of the threads
12
are wound on and entangled with the lower portions of the bodies
254
of the thread reels
251
. Therefore, the threads
12
are kept in a firmly stretching condition between the veneer roll
9
and the thread reels
251
in continued rotation of the thread reels
251
, and similar to the above described way, the threads
12
wound on the veneer sheet
1
as guide are wound on the thread reels
251
in synchronism with unwinding of the veneer sheet
1
from the veneer roll
9
. It should be appreciated that while the frame
250
in the above described embodiment freely moves forward or backward according to extending or contracting of the piston rod
259
of the fluid cylinder
258
, there is no specific limitation to this mechanism, but it may be replaced with a motion, forward or backward, of the timing belts by means of driving, in one direction or the other, of a motor with reduction gears as described above, a rack/pinion motion, a crank motion or the like.
In the embodiments, descriptions are made of recovery of the threads
12
on the preconditions that the tips of the threads
12
are hung down from the circumferential surface of the veneer roll
9
almost in a vertical condition wherein the threads
12
are wound as guide for a veneer sheet
1
in plural rows on the veneer roll
9
at arbitrary spatial intervals in the shaft direction of the veneer roll
9
. However, when a veneer sheet
1
is wound to form a veneer roll
9
, there arises a case where some of the terminal ends of the threads
12
wound as guide are entangled with fibers in the veneer sheet
1
and thereby not hung down vertically. Further, in the course when a veneer roll
9
formed by reeling a veneer sheet
1
moves along the easy down slope of the transfer frame
210
, or during a time when a veneer roll
9
awaits its turn in the veneer roll stock area
3
A, since a self-weight of each thread
12
is small, the threads are blown by a wind and a portion of each thread
12
in the middle thereof are entangled with fluffy fibers formed on the surface of the veneer sheet
1
, with the result that hanging positions of the respective threads
12
on the veneer roll
9
are disturbed at random.
In such a case, recovery of the threads
12
cannot be performed. Description will be made of an embodiment in which a position of each thread
12
is corrected with reference to
FIGS. 76 and 77
.
A pair of stoppers
263
that can freely protruded and retreated from the transport surface of the transfer frame
210
are provided at a waiting site of the veneer roll stock area
3
A. A next veneer roll
9
awaits its turn while the preceding veneer roll
9
is in operation of unwinding in the unwinding position
211
. A pair of longitudinal frames
264
vertically provided in the vicinity of the pair of stoppers
263
and moving blocks
265
are freely shiftable upward or downward by means of an elevating mechanism with the insides of the pair of longitudinal frames
264
as guide. An arm
267
is coupled with the top ends of the moving blocks
265
with a pin and fluid cylinders
268
as a forward/backward movement mechanism are supported by the lower ends of the moving blocks
265
so as to be freely inclinable. The distal end of the piston rod
269
of the fluid cylinder
268
is connected to a middle region of the arm
267
, the fore-ends of the arms
267
are connected with both ends of the correcting member
270
and the correcting member
270
can freely be moved close to or away from the veneer roll
9
by action of the fluid cylinder
268
while swinging with the pin coupling section as a fulcrum. A plurality of vacuum chuck holes
271
are formed on the side surface facing the veneer roll
9
of the correcting member
270
as shown in
FIG. 77
, wherein the vacuum chuck holes are used for sucking and retaining the threads
12
, and an exhauster
273
is connected to one end of the correcting member by way of a flexible exhaust duct
272
.
The arm
267
is swung counterclockwise in
FIG. 76
by action of the forward/backward movement mechanism (fluid cylinder
268
) and thereby, the correcting member
270
is put into contact with and pressed onto the circumferential surface of a next veneer roll
9
in an area along the shaft direction in the downstream side at the upward movement limit of the moving block
265
while the preceding veneer roll
9
is in an unwinding operation at the unwinding position
211
. When in contact with the next veneer roll
9
, the threads
12
arranged in plural rows wound on the veneer roll
9
as guide are retained on the correcting member
270
by vacuum-chuck action using the vacuum chuck holes
271
. After the threads
12
are retained by vacuum-chuck action, the moving blocks
265
is moved down by action of the elevating mechanism (fluid power cylinder
266
) while a position of the correcting member
270
relative to the veneer roll
9
is locked. When the moving block
265
is moves down, the threads
12
gradually come to a firmly stretching state between the correcting member
170
and the veneer roll
9
while the threads
12
are retained by vacuum-chuck action. Therefore, even if the terminal ends of the threads
12
wound as guide are entangled with fibers of a veneer sheet
1
in the form of a veneer roll
9
or positions from which the threads are hung down are in disorder since the free portions of the threads
12
are entangled with fluffy fibers on the surface of the veneer roll
9
in the middle of the free portions, the free portions of the threads
12
come into a firmly stretching state before the moving block
265
reaches the downward movement limit with the result that entanglement of the threads
12
with fibers is solved. When the retaining condition of the threads
12
to the correcting member
270
is canceled at the downward movement limit of the correcting member
270
, the threads
12
in the plural rows come into a state in which the threads
12
hang down from the circumferential surface of the veneer roll
9
almost vertically and respectively assume correct positions. It should be appreciated that while in the embodiment, the forward/backward movement mechanism of the correcting member
270
is the fluid cylinder
268
, there is no specific limitation to the mechanism, but it may be replaced with a rack/pinion motion, a crank motion or the like and that while in the embodiment, an elevating mechanism for the moving block
265
is the fluid cylinder
266
, it may be replaced with a motion, forward or backward, of the timing belts by means of driving, in one direction or the other, of a motor with reduction gears as described above, a rack/pinion motion, a crank motion or the like.
After the correction, the stopper
263
is retreated from the transport surface following completion of unwinding of the preceding veneer roll
9
and the next veneer roll
9
is transferred to the unwinding position
211
. In this situation, since the correcting member is located in the downward movement limit, there arises no inconvenience in transfer operation.
In the above described embodiment, description is made of the case where correction of positions of threads
12
before recovery thereof is performed in a waiting position in the veneer roll stock area
3
A while a preceding veneer roll
9
is in unwinding operation at the unwinding position
211
, but such a correcting operation can be performed prior to unwinding operation of a new veneer roll
9
at the unwinding position
211
.
Next, description will be made of another embodiment in which positions of threads
12
are corrected with reference to FIG.
78
. Linear ways
274
are laid down on the pair of transfer frames
210
in the downstream side from the unwinding position
211
, that is in the downstream side from the reel receivers
8
placed on the pair of the transfer frames
210
, linear blocks
275
are placed on the linear ways
274
in a freely movable manner and a correcting member
270
similar to the above description is mounted on the linear blocks
275
with a bracket
276
interposed therebetween. A forward/backward movement mechanism for moving the correcting member
270
to or away from a veneer roll
9
is provided in the further downstream side on the transfer frame
210
and the forward/backward, wherein in the embodiment, a fluid power cylinder
277
is adopted as the mechanism and the fore-end of the piston rod
278
thereof is connected to the bracket
276
.
In this embodiment, the correcting member
270
is first withdrawn to the backward movement limit position or to a position where no interference with a veneer roll
9
arises by action of the forward/backward movement mechanism (fluid cylinder)
277
. The veneer roll
9
moves on the transfer frames
210
and reaches a reel receiver position
8
, and the bearings of the veneer roll
9
are rotatably supported by the reel receiver
8
and the reel down-presser
66
. At this point, the drive guide bands
218
are in a waiting condition at the lower limit positions remote from the veneer roll
9
. Then, the piston rod
278
of the fluid cylinder
277
is extended and the correcting member
270
is pressed along the linear ways
274
to reach the downstream side circumferential surface of the veneer roll
9
with the result that the correcting member
270
gets into press contact with the veneer roll
9
along the shaft direction. When in press contact of the correcting member
270
, the threads
12
arranged in plural rows wound on the veneer roll
9
as guide are retained by vacuum-chuck action on the correcting member
270
with the help of the vacuum chuck holes
271
as described above. After vacuum-chuck retention of the threads
12
, the piston rod
278
of the fluid cylinder
277
is contracted and then, the correcting member
270
begins to retreat on the linear ways
274
. In the middle of the course of retreating of the correcting member
270
, the threads
12
gradually come into a firmly stretching state between the correcting member
270
and the veneer roll
9
as drawn with double dot & dash lines in
FIG. 78
while the threads
12
are retained by vacuum-chuck action on the correcting member
270
. Therefore, even if the terminal ends of the threads
12
wound as guide are entangled with fibers of a veneer sheet
1
in the form of a veneer roll
9
or positions from which the threads are hung down are in disorder since the free portions of the threads
12
are entangled with fluffy fibers on the surface of the veneer roll
9
in the middle of the free portions of the threads
12
, the free portions of the threads
12
come into a firmly stretching state before the correcting member
270
reaches the downward movement limit with the result that entanglement of the threads
12
with fibers is solved. Thereafter, when the correcting member
270
reaches the backward movement limit position, the vacuum-chuck retention of the threads
12
to the correcting member
270
is canceled and the threads
12
come into a state in which the free portions of the threads
12
are hung down almost vertically from the circumferential surface of the veneer roll
9
by self-weight from a state in which the free portions of the threads
12
are in a state pulled in the lateral direction from the veneer roll
9
.
It should be appreciated that as the forward/backward movement mechanism of the correcting member
270
in the above described embodiment, extending and contracting motions of the fluid cylinder
277
are adopted, but there is no specific limitation to this mechanism, but it may be replaced with a motion, forward or backward, of the timing belts by means of driving, in one direction or the other, of a motor with reduction gears as described above, a rack/pinion motion, a crank motion or the like. Further, in the above described embodiment, description is made of the case where correction of positions of threads
12
before recovery thereof is performed prior to unwinding operation of a new veneer roll
9
at the unwinding position
211
, but such a correcting operation can be performed at the waiting position of the veneer roll stock area
3
A while the preceding veneer roll
9
is in unwinding operation.
While in the above described embodiments, the vacuum-chuck holes
271
are formed on the correcting member
270
and positions of the threads
12
are corrected while retaining the threads
12
by vacuum-chuck action, the vacuum-chuck holes
271
can be replaced with a pressure sensitive adhesive tape such as an adhesive tape or a gummed cloth tape, stuck on the side facing a veneer roll
9
of the correcting member
270
, wherein the threads
12
are entangled with the pressure sensitive adhesive tape to retain. In addition to them, as shown in
FIG. 76
, the following methods can also be adopted: A highly frictional member such as a magic tape or a sand paper with abrasive grains thereon is stuck on the side facing a veneer roll
9
of the correcting member
270
, the surface of the correcting member
270
is deformed so as to form peaks and valleys in small size thereon by hammer shock, or the surface of the correcting member
270
is processed by filing or knurling so as to form fine protrusions
279
thereon, wherein the threads
12
are entangled with such rough surfaces of the correcting member
270
to retain. In this case, occurrence of a firmly stretching state between the threads
12
and the correcting member
270
is caused by entanglement retention by a pressure sensitive sheet, or entanglement retention by fine protrusions
279
. It should be appreciated that the vacuum-chuck holes
271
to produce vacuum-chuck retention, the pressure sensitive adhesive tape to produce entanglement retention or fine protrusions to produce entanglement retention may be formed all over the surface facing a veneer roll
9
of the correcting member
270
, but as shown in
FIG. 79
, such special areas each with a proper width may be formed on the correcting member
270
in the vicinity of positions corresponding to those where the threads
12
wound as guide in the shaft direction of take-up reel
7
of a veneer roll
9
.
A body
254
of the thread reel
251
, as shown in
FIG. 80
, has a shape like a hand drum that comprises: two circular flanges at both sides; and a portion between the flanges that further includes two conical portions, the section of one conical portion being constituted of two slopes such that a diameter is narrowed toward the middle in its length from the flanges, both conical portions being in mirror-symmetry with the other, and a V shaped annular groove
280
being formed at connection between the two conical portions in the middle in its length, wherein the conical portions can be of a female/male fitting type or a screw type at the groove as the boundary, both being assembled in a demountable manner. Hence, with such a structure of the thread reel, recovered threads
12
can be taken out from the body
254
of the thread reel
251
with ease. According to the thread reel
251
, when a thread
12
begins to be wound on the thread reel
251
, the fore-end of the thread
12
that has reached the body
254
is guided along a slope and comes to the V shaped groove
280
, which is located almost in the middle, thereby ensuring winding of the thread on the body
254
. Further, after completion of winding of the threads
12
, the thread reel
251
is divided into two halves, left and right, at the middle as the boundary and thereby, wound threads
12
on the thread reel
251
can be taken out with ease. Therefore, on the contrary, in the next operation, all that is required is to assemble the two halves into one piece, which entails improvement of operability.
While in the above described embodiments, description is made of the case where the body
254
of the thread reel
251
has a smooth surface as a precondition, there can be a case of a pressure-sensitive tape such as an adhesive tape or a gummed cloth tape, which facilitates winding threads
12
on the body
254
. Further, in addition, the following methods can also be adopted in which the body
254
itself is processed so as to be of a high friction coefficient: A highly frictional member such as a sand paper with abrasive grains thereon is stuck on the body
254
, the surface of the body
254
is deformed so as to form peaks and valleys in fine size thereon by hammer shock, or the surface of the body
254
is processed by filing or knurling so as to form fine protrusions
281
thereon as shown in
FIG. 81
, wherein the threads
12
are entangled with the highly frictional member on the body
254
to retain with ease.
Accordingly, if the fore-end portion as a free end of a thread
12
gets into contact with any position on the surface of the body
254
in starting of winding of the thread
12
on a thread reel
251
, the thread
12
is easily entangled with the surface of the body
254
since a pressure-sensitive tape or fine protrusions are provided on the surface. Hence, even if the fore-end as a free end of a thread
12
is misplaced with a not large deviation from predetermined positions, winding of the thread
12
on a thread reel
251
can be performed with no trouble. Thereafter, threads
12
are kept in a firmly stretching state between a veneer roll
9
and the thread reel
251
and the threads
12
wound as guide on the veneer roll
9
are taken-up on the thread reels
251
in synchronism with unwinding of veneer sheet
1
from the veneer roll
9
as described above.
Further, a thread guide
255
can be formed as a flat half ring with a section of an arch-like shape as shown in FIG.
82
and in this case, the thread guide of this type is mounted along the flanges of a thread reel
251
such that a clearance is produced between the surface of the body
254
of the thread reel
251
and the thread guide
255
and one half of the introductory side for the thread is exposed as an open state. With this configuration, a thread
12
is guided into between the lower portion of the body
254
and the lower portion of the half-ring shaped thread guide
255
by ejection of air (blown-out) or an exhaust stream (suction steam). In this situation, since ejection of air (blown-out) or an exhaust stream (suction stream) flows toward the topmost part in an arch-like section of the flat half-ring along a route from the bottom part thereof to above, the fore-end of a thread
12
is carried on the stream to reach the topmost part of the thread guide
255
and arrive at the upper opening thereof, thereafter falling down by self weight on the body
254
due to extinction of a stream. Therefore, the fore-end of a thread
12
is in a state where it is wound along more than a half circumference of the body
254
of the thread reel
251
and the thread
12
is easily wound on body
254
in company with counterclockwise rotation as in
FIG. 82
of a thread reel
251
.
Especially when a thread reel has a body of a hand drum type, the fore-end portion of a thread
12
that falling down from above a thread guide
255
runs along a slope to arrive at a V-like groove
280
located in the middle, making winding of a thread
12
ensured.
Then, as shown
FIGS. 83
to
89
, description will be made of an embodiment where at least one of threads
12
wound in plural rows arranged on a veneer roll
9
in the length direction thereof is protruded outside the veneer roll
9
with an angle θ from a state where the thread is wound along the circumferential surface of the veneer roll
9
and in the situation, a veneer sheet
1
is unwound from the veneer roll
9
.
When a thread
12
is protruded outside the veneer roll
9
, as shown in
FIG. 89
, a pulling direction of a thread
12
is first determined such that the direction is located in the middle between a veneer sheet separating position P at which the veneer sheet
1
begins to be unwound from the veneer roll
9
and a position Q at which a line from the veneer sheet separating position P through the center of the veneer roll
9
intersects the circumference of the veneer roll
9
in the unwinding side of a veneer sheet
1
side formed between the veneer sheet separating position P and the veneer sheet separation opposite position Q. It is important that the pulling direction is determined such that when a veneer sheet
1
unwound from the veneer roll
9
tends to be wound on the veneer roll
9
in accompanying manner, the pulling direction of the thread
12
works so as to prevent accompanying phenomena of a veneer sheet
1
with the veneer roll
9
from occurring and to be effective for bringing the veneer sheet
1
back to the transport surface
298
. Therefore, it is preferable that an angle α formed between a line S that connects between the center
0
of the veneer roll
9
and the veneer sheet separating position P and a line S′ that connects the center O and a separating point R of a thread
12
is less than 180 degrees, or desirably less than 90 degrees, and a thread
12
is preferably pulled out from the veneer roll
9
with an angle in the ranges. With such an angle in use, a veneer sheet
1
tending to accompany the veneer roll
9
is effectively prevented by a thread
12
from accompanying and is effectively brought back to the unwinding transport surface
298
. On the other hand, when a thread
12
is pulled toward almost directly above along the curvature of the veneer roll
9
(in a direction tangential at the middle point R′) or in a direction inclined from the directly above toward the other side from the veneer sheet
1
unwinding side, it is hard to block the accompanying action of a veneer sheet
1
by a thread
12
.
As shown in
FIG. 85
, a position at which a thread
12
is supported protruding outwardly is located close to an unwinding surface
295
on which a veneer sheet
1
is unwound from the veneer roll
9
. For example, a support member
296
is protruded from a beam constituting the reel support
65
in the veneer roll transport-in side. A thread auxiliary pulley
297
is mounted in rotatable manner at the fore-end of the support member
296
, a thread
12
that is wound along the curvature of the veneer roll
9
is protruded outwardly and the thread
12
is supported by the thread auxiliary pulley
297
. In this situation, threads
12
wound on the veneer roll
9
in plural rows arranged in the length direction of the veneer roll
9
are pinched between the unwinding rollers
230
and
235
or kept in a properly firm stretching condition by the thread reel
251
that continues to rotate through a torque limiter
252
.
As described above, when a veneer sheet
1
is unwound while recovering a thread
12
from a veneer roll
9
, there is a case where a veneer sheet
1
tends to be rewound by accompanying the surface of the veneer roll
9
in rotation for unwinding as shown in
FIG. 84
, while the veneer sheet
1
is not unwound to the transport surface
298
. In such a case, as shown in
FIG. 85
, since a thread
12
protruding from a state where the thread
12
resides along the curvature of the veneer roll
9
and supported by the thread auxiliary pulley
297
is in a state where the thread
12
extends outwardly at an angle θ to the circumferential surface of the veneer roll
9
, the thread
12
prevents the veneer sheet
1
from not only accompanying the veneer roll
9
but being rewound thereon by getting into contact with the unwound veneer sheet
1
. The veneer sheet
1
that is blocked from the accompanying by a thread
12
is brought back to the unwinding transport surface
298
and thereby transferred to the next step.
It should be appreciated that while even at least one thread
12
that protrudes outwardly effectively works, it is preferable that when threads
12
arranged in the vicinity of both sides in the length direction of a veneer roll
9
are respectively protruded outwardly and supported by the thread auxiliary pulley
297
, a veneer sheet
1
to be unwound that would otherwise tend to accompany is prevented from the accompanying by actions from the both sides which increases its effectiveness of the thread auxiliary pulley
297
due to threads
12
from the both sides instead of a single thread
12
.
If a support position by the thread auxiliary pulley
297
for a thread
12
is close to the unwinding surface
295
as described above, a veneer sheet
1
that tends to accompany a veneer roll
9
can be blocked against the accompanying at an initial stage thereof. However, if machine or something is installed in a passage leading to a proper support position for the thread auxiliary pulley
297
or the support position makes a worker hard to come to or go away from his work site since he has to walk through there, it can be solved in such a manner that a thread
12
is protruded outwardly at another position and then the support position can be moved close to the unwinding surface
295
of a veneer sheet
1
.
In
FIG. 86
, a unit with which the support position for a thread
12
is moved is exemplified, a thread support unit
299
is located at a position spaced from the circumferential surface of the veneer roll
9
outwardly in a radial direction. Protruded arms
301
to which the thread auxiliary pulleys
297
are rotatably mounted are further mounted on a support shaft
300
in the vicinity of its both ends, wherein the support shaft
300
extends almost in parallel to the shaft of a veneer roll
9
. Both ends of the support shaft
300
are supported by arm rods
302
at one ends thereof and the other ends of the arm rod
302
are attached to rotary shafts
303
. Further, an end of a lever
304
is mounted to one rotary shaft
303
and the other end is connected to a piston rod
306
of a fluid cylinder
305
supported by the reel support
65
.
For example, in a case where a work site deck (not shown) is installed above the unwinding position
211
, a worker protrudes threads
12
in the vicinity of both ends of the veneer roll
9
wound along the curvature of the veneer roll
9
to a protruding position
307
drawn with a double dot & dash line in the figure located outwardly in a radial direction while utilizing the deck. The threads
12
are supported by the auxiliary pulleys
297
held by the support shaft
300
while winding on the auxiliary pulleys
297
. Then, the piston rod
306
of the fluid cylinder
305
is extended and thereby, the rotary shaft
303
is rotated through an angle to swing the support shaft
300
while keeping the support shaft
300
radially outwardly spaced from the veneer roll
9
and move the support shaft
300
to a displacement position
308
of
FIG. 83
drawn with a solid line while routing along the circumferential surface of the veneer roll
9
. After the displacement, as described above, the threads
12
are recovered from the veneer roll
9
and at the same time a veneer sheet
1
is unwound from the veneer roll
9
.
While in the embodiment, when the rotary shaft
303
is rotated through an angle, the lever
304
is swung, an alternative method is as follows: A pinion gear
309
is mounted to the rotary shaft
303
and a piston rod
312
of a fluid cylinder
311
is connected to a rack gear
310
to mesh with the pinion gear
309
as shown in FIG.
87
. According to this method, the rack gear
310
is moved following extending or contracting of the piston rod
312
and thereby, the pinion gear
309
is rotated in one direction or the other, with the result that the support shaft
300
can be moved between the protruding position
307
and the displacement position
308
.
Further, likewise as shown in
FIG. 88
, another case may be a choice: A pinion gear
309
is mounted to the rotary shaft
303
and a drive shaft of a motor
314
is connected to a pinion gear
313
to mesh with the pinion gear
309
. According to this method as well, the pinion gear
309
to mesh with the pinion gear
313
is rotated in one direction or the other following rotation of the motor
314
in one direction or the other and thereby, the support shaft
300
can be moved between the protrusion position
307
and the displacement position
308
.
Claims
- 1. A tape feeding unit for a veneer roll which feeds a tape into between veneer sheets that is wound on a take-up reel comprising:a vacuum chuck conveyor that guides the tape into between veneer sheets from a feed source; a tape rack that is provided to a tape feed source, which has a plurality of tape housing rooms not only arranged in a movable manner in a direction almost at a right angle to a tape feed direction of the vacuum-chuck conveyor, but also respectively separated by partition members preventing falling of a tape roll to either of both sides and respectively having tape rolls accommodated therein that are each produced by winding a tape on a core; which is intermittently moved over a distance equal to a pitch at which the tape housing rooms are arranged such that each of the tape housing rooms are sequentially located on a transport route of the vacuum-chuck conveyor; and which is operated such that when a tape housing room arrives on the transport route, a tape is unwound from a tape roll through the front side thereof that is opened while a tape roll is rotatably supported and simultaneously prevented from falling to either of both sides by partition members; and a forward movement stopper member that is disposed in an adjacent manner to the tape rack downstream therefrom on the transport route of the vacuum-chuck conveyor, which stops a tape roll, after a tape housing room of the tape rack comes to be located on the transport route of the vacuum-chuck conveyor, and a tape roll in the tape housing room then moves forward by an extreme extent at which the tape roll does not disengage from partition members, and which controls a position of the tape roll such that the tape is unwound from the tape roll at a place where the tape roll has been stopped while being rotated by the vacuum conveyor.
- 2. A tape feeding unit according to claim 1, wherein the forward movement stopper member has an exit section through which, when a residual amount of a tape wound on a core of a tape roll is nothing or equal to or less than a predetermined amount in a last stage, the core is allowed to pass to a downstream side of the vacuum chuck conveyor from the exit section; and a core discharge unit that is disposed in the downstream side of the exit section and which discharges the core to a side of the vacuum-chuck conveyor.
- 3. A tape feeding unit according to claim 2, wherein the core discharge unit comprises: a core stopper that blocks a movement of the core that has passed through the exit section of the forward movement roller stopper member; a discharge opening for discharging the core to the side of the vacuum-chuck conveyor, which opening is formed to a side of the core stopper; an opening/closing member that opens or closes the discharge opening; and discharge assist means that assists the core to be discharged through the discharge opening.
- 4. A tape feeding unit for a veneer roll that feeds a tape into between veneer sheets wound on a take-up reel, comprising:transport means that guides the tape into between veneer sheets from a feed source thereof; a sideways control member that is provided to the feed source and which prevents a tape roll that is produced by winding the tape on a core from falling sideways; and a forward movement stopper member that is disposed at a forward position from the tape roll on a route of the transport means separately and independently from the sideways control member and blocks a forward movement of the tape roll while allowing feed rotation of the tape roll, and wherein the forward movement stopper member comprises: a first idling roller stopper that is located at a farther position from a transport surface of a vacuum conveyor and which is in contact with a tape roll of a larger diameter and rotates following rotation of the tape roll; and a second idling roller stopper that is located at a closer position to the transport surface and which is in contact with a tape roll of a smaller diameter and rotates following rotation of the tape roll.
- 5. A tape feeding unit according to claim 4, wherein the forward movement stopper member has an exit section through which, when a residual amount of a tape wound on a core of a tape roll is nothing or equal to or less than a predetermined amount in a last stage, the core is allowed to pass to a downstream side of the vacuum chuck conveyor from the exit section; and a core discharge unit that is disposed in the downstream side of the exit section and which discharges the core to a side of the vacuum-chuck conveyor.
- 6. A tape feeding unit according to claim 5, wherein the core discharge unit comprises: a core stopper that blocks a movement of the core that has passed through the exit section of the forward movement roller stopper member; a discharge opening for discharging the core to the side of the vacuum-chuck conveyor, which opening is formed to a side of the core stopper; an opening/closing member that opens or closes the discharge opening; and discharge assist means that assists the core to be discharged through the discharge opening.
- 7. A tape feeding unit for a veneer roll that feeds a tape into between veneer sheets wound on a take-up reel, comprising:transport means that guides the tape into between veneer sheets from a feed source thereof; a sideways control member that is provided to the feed source and which prevents a tape roll that is produced by winding the tape on a core from falling sideways; and a forward movement stopper member that is disposed at a forward position from the tape roll on a route of the transport means separately and independently from the sideways control member and blocks a forward movement of the tape roll while allowing feed rotation of the tape roll, and wherein the forward movement stopper member has an exit section through which, when a residual amount of a tape wound on a core of a tape roll is nothing or equal to or less than a predetermined amount in a last stage, the core is allowed to pass to a downstream side of a vacuum-chuck conveyor from the exit section; and a core discharge unit that is disposed in the downstream side of the exit section and which discharges the core to a side of the vacuum-chuck conveyor.
- 8. A tape feeding unit according to claim 7, wherein the core discharge unit comprises: a core stopper that blocks a movement of the core that has passed through the exit section of the forward movement roller stopper member; a discharge opening for discharging the core to the side of the vacuum-chuck conveyor, which opening is formed to a side of the core stopper; an opening/closing member that opens or closes the discharge opening; and discharge assist means that assists the core to be discharged through the discharge opening.
- 9. A tape feeding unit according to claim 8, wherein the discharge assist means comprises at least one of the following constituents which are: a slope that is formed at a portion of the core stopper on which the core hits and which not only blocks a forward movement of the core, but guides the core to the discharge opening; and a discharge member that is connected to the opening/closing member and which forcibly discharges the core through the discharge opening by catching the core when the opening/closing member gets opened.
- 10. A tape feeding unit for a veneer roll that feeds a tape into between veneer sheets that is wound on a take-up reel, comprising:transport means that guides the tape into between veneer sheets from a feed source thereof; a sideways control member that is provided to the feed source and which prevents a tape roll that is produced by winding the tape on a core from falling sideways; a forward movement stopper member that is disposed at a forward position from the tape roll and blocks a forward movement of the tape roll while allowing feed rotation of the tape roll; and an upside-down turn preventive member that prevents front and rear surfaces of the tape from being turned in the other way by touching the tape guided into veneer sheets from a distal-end of the transport means and preventing a twist of a width direction of the tape.
- 11. A tape feeding unit according to claim 10, wherein the upside-down turn preventive member is mounted such that the upside-down turn preventive member is movable between an action position at which the upside-down turn preventive member gets into contact with the tape by protruding from the distal-end of the transport means and a withdrawal position that is located in a direction of moving away from the tape; and has an actuator that performs protruding to the action position and returning back to the withdrawal position of the upside-down turn preventive member in a continuous manner from when a tape is fed to veneer sheets until the tape is cut.
- 12. A tape feeding unit for a veneer roll that feeds a tape into between veneer sheets which is wound on a take-up reel, comprising:transport means that guides the tape into between veneer sheets from a feed source thereof; a sideways control member that is provided to the feed source and which prevents a tape roll that is produced by winding the tape on a core from falling sideways; a forward movement stopper member that is disposed at a forward position from the tape roll and blocks a forward movement of the tape roll while allowing feed rotation of the tape roll; a tape cutter that cuts the tape in the vicinity of a distal end of the transport means; and tension imparting means that imparts the tape between the distal end of the transport means and the veneer sheets a tension larger than in a normal condition in cutting the tape such that the tape is cut in a state of the tension.
- 13. A tape feeding unit according to claim 12, wherein at least part of the transport means is movable in a direction of imparting the tape a tension by a movement mechanism, the movement mechanism constituting the tension imparting means and a tape receiving member that ensures the tape in cutting from escaping is provided adjacent to the tape cutter, wherein the tape is pressed to the receiving member such that the tape is bent at the receiving member as if both sides of the tape would intersect at an angle while the tape is kept under a tension in the cutting.
- 14. A tape feeding unit for a veneer roll that feeds a tape into between veneer sheets which is wound on a take-up reel, comprising:transport means that guides the tape into between veneer sheets from a feed source thereof; a forward movement stopper member that is disposed at a forward position from the tape roll and blocks a forward movement of the tape roll while allowing feed rotation of the tape roll; a tape cutter that is provided at a position protruding from a distal end of the transport means; and a tape roll rotation stop device that stops rotation of a tape roll at an upstream position from the forward movement stopper member.
- 15. A tape feeding unit according to claim 14, wherein the tape rotation stop device is constructed such that in an upstream position from the forward movement stopper member, a receiving member is connected with a conveyor frame on one side of a belt leading the tape toward a veneer sheet, the receiving member faces toward a direction intersecting a circulation direction of the belt and receives one side of the tape roll and a press member that presses the other side of the tape roll is disposed on the other side of the tape roll in a movable manner toward the receiving member.
- 16. A tape feeding unit according to claim 14, wherein the tape roll rotation stop means comprises: a pair of pinching members that pinch the tape roll from both sides thereof in a direction intersecting an unwinding direction of the tape roll such that the pair of the pinching members can be opened or closed at an upstream position from the forward movement stopper member.
- 17. A tape feeding unit according to claim 14, wherein the tape roll rotation stop means comprises: a press member that is disposed at an upstream position from the forward movement stopper member and which has a configuration that the press member is movable to the tape roll or away therefrom with a position above the tape roll as a waiting position.
- 18. A tape feeding unit according to claim 14, wherein the cutter is disposed at a protruding position of the distal end of the transport means and a cutting section of the cutter is not only disposed in a direction intersecting a feed direction of the tape, but movable in a direction of getting into contact with the tape by a movement mechanism, wherein the cutting section gets into a sliding contact with a surface of the unwound tape by the movement mechanism.
Priority Claims (9)
Number |
Date |
Country |
Kind |
11-48675 |
Feb 1999 |
JP |
|
11-48677 |
Feb 1999 |
JP |
|
11-146884 |
May 1999 |
JP |
|
11-146885 |
May 1999 |
JP |
|
11-206400 |
Jul 1999 |
JP |
|
11-206401 |
Jul 1999 |
JP |
|
11-308146 |
Oct 1999 |
JP |
|
11-361544 |
Dec 1999 |
JP |
|
11-361545 |
Dec 1999 |
JP |
|
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