Patent Grant
6974365
1. Field of the Invention
The invention relates to a machine for machining workpieces of wood, plastic material or the like, comprising at least one longitudinal profiling unit which has at least one longitudinal profiling spindle, past which the workpiece can be moved by means of at least one advancing unit and which has clamping jaws. The invention also relates to a method for machining such workpieces, wherein the workpieces are clamped in at least one advancing unit and transported together with it through the machine.
2. Description of the Related Art
With such machines workpieces are machined from which window and door frames as well as wings of windows are produced. In the longitudinal profiling unit the workpieces are profiled along their longitudinal sides. For transporting the workpieces through the longitudinal profiling unit, advancing rollers are provided which are suspended from a support and rotatably driven. These advancing rollers press onto the workpieces which are supported on tabletops on which they are transported through the machine by means of the advancing rollers. The advancing rollers are subject to wear and soiling so that the transport of the workpieces is impaired. Moreover, the transport of short workpieces presents problems.
It is an object of the present invention to configure the machine of the aforementioned kind and the method of the aforementioned kind such that a reliable and simple transport through the machine as well as an exact positioning of the workpieces is ensured.
This object is solved by the invention for the machine of the aforementioned kind in that the clamping jaws are arranged above and below the workpiece such that at least some of the upper clamping jaws are staggered relative to the lower clamping jaws, when viewed in a plan view onto the advancing unit, wherein between the individual clamping jaws a small free space is provided, when viewed in a plan view. This is object is moreover solved for the method of the aforementioned kind in that the workpieces are clamped from above and below in the advancing unit and are transferred between different machining actions, wherein the workpieces always remain clamped during transfer.
In the machine according to the invention the advancing unit in the longitudinal profiling unit is in the form of a clamping unit with which the workpieces to be machined are not only clamped but also transported through the longitudinal profiling unit. Because of the advancing unit according to the invention, advancing rollers are no longer required in the longitudinal profiling unit. The workpieces to be machined are reliably engaged by the clamping unit and transported together with it through the machine. Slip problems, as they can be observed for advancing rollers, do not occur. By employing the clamping unit the top sides of the workpieces are treated gently which results in an excellent machining quality. It is also possible to clamp and machine very short workpieces by means of the clamping unit. Since the clamping unit is moved in the longitudinal profiling unit, it is possible to follow, measure, and position each workpiece very precisely by means of the axes of the machine. In this connection, limit switches, used in conventional machines, are no longer needed. The clamping jaws are arranged above and below the workpiece so that the workpiece is clamped from above and below. In this way, the workpiece can be machined without problems on its longitudinal sides with corresponding tools. The upper and lower clamping jaws are arranged such that, in a plan view, they are staggered relative to one another and have a small free space between them. With such a configuration of the clamping unit the workpieces can be clamped universally, flexibly, and reliably. In this way, the workpieces, in particular, also thin and short workpieces, can be machined in the clamped position with extreme precision and quality. When the workpieces are transferred between individual machining processes, they always remain clamped during transfer so that an extremely precise machining is ensured.
In the drawing:
a to
a to
The machine described in the following is used for machining wooden articles used, for example, for assembling window or door frames or wings. However, the machine can also be used for machining wooden articles which are used for stair steps, furniture parts in frame construction or case construction or the like. The machine according to
The wooden articles 3 to be machined are clamped in a predetermined position, preferably centrally, in the transverse profiling unit 1 by means of a clamping device 4 which is pivotable on the carriage 5′ about a vertical axis 6. The carriage 5′ can be moved along a transverse carriage 5 which is movable along a guide 7. Both carriages 5, 5′ are adjustable relative to one another in perpendicular directions.
The transverse profiling unit is provided with at least one saw 8 with which the respective end of the wooden article 3 can be cut off. Depending on the position of the wooden article 3 relative to the saw 8, the end faces of the wooden article 3 can be sawed perpendicularly but also at an acute angle or obtuse angle to the longitudinal direction of the wooden articles. In this case, the wooden article 3 is pivoted by means of the clamping device 4 about the axis 6 by the desired angle. For this purpose, a motor drive (not illustrated) is provided with which the clamping device 4 can be automatically pivoted into the desired position. Advantageously, the clamping device 4 is connected to a CNC control.
The saw 8 has a circular saw blade 9 which is driven in rotation about a horizontal axis. Downstream of the saw 8 the transverse profiling unit 1 is provided with at least one vertical spindle 10 on which, as is known in the art, a tenon/mortise tool 11 is fixedly seated. By means of this tool, the previously sawed end of the wooden article 3 is profiled in the transverse direction, for example, by providing a tenon or a mortise or a counter profile. The spindle 10 with the tool 11 can be adjusted in the axial direction as is known in the art. In this case, two or more tools are seated on the spindle 10 above one another with which the ends of the wooden article 3 can be machined in the desired way. Moreover, the spindle 10 can also be radially adjustable in order to be able to adjust the spindle 10 to the different diameters of the respective tool 11. The transverse profiling unit 1, as shown in the illustrated embodiment, can be provided with a second spindle 10 for an additional tool 11. This second spindle 10 is retracted and thus not in use. Instead of retracting this spindle 10, the clamping device 4 can also be retracted by means of the carriage 5′ on the transverse carriage 5.
Downstream of the spindle 10, the transverse profiling unit 1 is provided with at least one drilling and/or doweling unit 12. By means of this unit, the wooden article 3 can be provided with at least one bore and/or with at least one dowel subsequent to the transverse profiling process.
The transverse profiling unit 1 can also have only the saw 8 and/or the spindle 10 and/or the unit 12.
The transverse carriage 5 is moved from the initial position illustrated in
When the transverse carriage 5 has reached the transfer location, the clamping device 4 is rotated such that the wooden article is positioned parallel to the transport direction in the longitudinal profiling unit 2. In this position, the wooden article can be received by an advancing unit 15 of the longitudinal profiling unit 2. The wooden article 3 is transported by it in its longitudinal direction through the longitudinal profiling unit and is machined during this pass on the corresponding longitudinal side. In the machine according to
In a second embodiment of the machine according to
In the second preferred machining operation in the transverse profiling unit 1 first both ends of the wooden article 3 are machined wherein the transverse carriage 5 moves in the described way twice through the transverse profiling unit 1. Then the wooden article 3, which has been machined on both ends, is transferred to the advancing unit 15 which is in the transfer position illustrated in FIG. 1. The wooden article 3 is then moved by the advancing unit 15 past the drilling units 16 and the longitudinal profiling tools 14 and machined on its longitudinal side. By means of the transverse conveyor 20 and the transport device 23 the wooden article 3 is returned to the transverse profiling unit 1 and received by the clamping device 4. With the transverse carriage 5 the wooden article 3 is transported without machining through the transverse profiling unit 1 and transferred to the advancing unit 15 such that the wooden article 3 upon transport through the longitudinal profiling unit is machined on the other longitudinal side.
While the wooden article is transported by the transverse conveyor 20 to the transporting unit 23, the advancing unit 15 is returned into the transfer position so that it can instantly take over this wooden article.
The machine according to
As is illustrated in
The lower clamping jaw 25 is provided at its free end with an upwardly extending stop 31 which prevents slipping of the wooden articles 3 transverse to the clamping jaws 25, 26 and ensures a precise alignment or positioning of the wooden articles 3. The clamping jaw 25 is pivotable about a horizontal axis 32 which is positioned transversely to the longitudinal direction of the clamping jaw. When the wooden articles 3 are to be transferred, in a way to be described in the following, to the advancing unit 15 of the longitudinal profiling unit 2, the clamping jaw 25 can be pivoted about the axis 32 to such an extent in the downward direction into a release position such that the stop 31 is positioned outside of the movement path of the wooden articles 3 (FIG. 8).
For transferring the wooden articles 3 from the clamping device 4 to the advancing unit 15, the clamping device 4 is first adjusted in the adjusting direction 30 relative to the intermediate clamping device 33. The two clamping jaws 34, 35 of the clamping device 33 are adjusted such that the wooden articles 3 can be moved reliably between the clamping jaws 34, 35. The clamping device 33 is positioned within an area outside of the adjusting path of the clamping device 4 or its clamping jaws 25, 26. The clamping device 4 is adjusted to such an extent that the wooden articles 3 are completely positioned between the clamping jaws 35, 34 of the clamping device 33 (FIG. 8). As soon as the wooden articles 3 have been moved completely between the clamping jaws 34, 35, one of the clamping jaws, in the embodiment the upper clamping jaw 34, is moved toward the wooden articles 3 which are thus reliably clamped between the clamping jaws 34, 35 of the clamping device 33 (FIG. 8). Subsequently, the lower clamping jaw 25 of the clamping device 4 is pivoted about the axis 32 to such an extend downwardly that the stop 31 of the clamping jaw 25 is located in an area below the wooden articles 3. Now the clamping device 4 can be returned in the direction of arrow 41. This is carried out by a corresponding return of the transverse carriage 5 on which the clamping device 4 is arranged.
During transfer of the wooden articles 3 from the clamping device 4 to the intermediate clamping device 33, the transfer unit 36 is still in the initial position in the area below the intermediate clamping device 33 (FIG. 8). As soon as the clamping device 4 has been returned, the transfer unit 36 is moved into the transfer position illustrated in FIG. 9. For this purpose, it is necessary that the transfer unit 36 is retracted first in its lowered position in the direction of arrow 42 such that during the subsequent adjustment of the transfer unit 36 in the vertical direction (arrow 43 in
As soon as the belts 37, 38 have been adjusted in this way, the clamping jaws 34, 35 of the intermediate clamping device 33 can be opened so that the wooden articles are released. Subsequently, the transfer unit 36 with the clamped wooden articles 3 is retracted in the direction of arrow 30 (
As soon as the intermediate clamping device 33 is in an area outside of the wooden articles 3, the transfer unit 36 is moved counter to the direction of arrow 30 (
Since during longitudinal profiling the wooden articles 3 cannot be positioned adjacent to one another in contrast to transverse profiling, only one wooden article 3 is first transported into the advancing unit 15. As soon as the wooden article 3 contacts the stops 46, the clamping jaws are moved downwardly and this wooden article 3 is clamped in the advancing unit 15. Subsequently, the advancing unit 15 is moved in the advancing direction 21 (
After this second wooden article 3 has been clamped in the advancing unit 15, the upper support element 39 of the transfer unit 36 is moved upwardly so that the transfer unit 36 can be retracted counter to the advancing direction 42 (FIG. 8). Subsequently, the transfer unit 36 is lowered again so that it is available for the next transfer cycle. When the wooden articles 3 to be machined are long, only one wooden article can be clamped in the advancing unit 15 for a corresponding length. Then the carriage 5 must wait in the transfer position until the advancing unit 15 has been returned into the transfer area after transfer of the longitudinally profiled wooden article 3.
Depending on the width of the wooden article, the clamping device 4 of the transverse profiling 1 can receive only one wooden article 3 but also more than two wooden articles. When the wooden article 3 is as wide as the clamping elements of the clamping device 4, the clamping device 4 receives only one wooden article 3 and transfers it in the described way to the advancing unit 15 after machining in the transverse profiling unit 1. When the wooden articles 3 have a comparatively minimal width, the clamping device 4 can clamp three or more wooden articles 3 resting against one another. Depending on the length of these wooden articles 3 and the advancing unit 15, they can be clamped sequentially in the advancing unit 15. When the length of the advancing unit 15 is insufficient to clamp all wooden articles 3 sequentially behind one another in the advancing unit 15, the transfer of the remaining wooden articles 3 is carried out when the advancing unit 15 is returned into its transfer position after machining of the wooden articles received in the longitudinal profiling unit 2. Now the remaining wooden articles 3 can be transferred in the described way to the advancing unit 15.
As long as the wooden articles 3 are still clamped in the intermediate clamping device 33, bores are machined, if needed, into the wooden article 3 advantageously by means of the drilling unit 12 of the transverse profiling unit 1. During this drilling process the clamping device 4 can be returned into the initial position for receiving the next workpiece.
With the aid of
The upper end of the back wall 48 of the carrier 47 has a transition into a support part 52 positioned perpendicularly to it. At least one drive 53 for the clamping jaws 54 is attached to its underside. The drive 53 has advantageously lifting cylinders 56 (
At least one rake-shaped support 62 is supported on the support part 52 in which the stops 46 for the wooden articles 3 are supported. These stops 46 are advantageously stop bolts which extend perpendicularly past the top side of the support 62 facing the clamping jaws 54, 55 and which are subjected to the force of at least one pressure spring 63 which moves the stops 46 axially into a stop position.
The clamping jaws 54 have in a plan view (
The clamping jaws 54 are positioned in the vertical direction opposed to the clamping jaws 55 whose upper sides 68 form the support 45 (
The clamping jaws 55, as illustrated in
The lower clamping jaws 55 project transversely from a leg 71 (
The rake-shaped support 62 has horizontally projecting fingers 73 (FIG. 4 and
The advancing unit 15 can also have two or more adjacently positioned supports 62 which are advantageously adjustable independently from one another in the way described above in order to clamp several wooden articles behind one another which are to be machined with different widths.
As has been explained in connection with
The stops 46 are adjusted in the required position by a corresponding movement of the rake-shaped support 62 in the movement direction 75 before transfer of the wooden articles 3. The upper clamping jaws 54 have been adjusted slightly upwardly during the transfer so that they will not impede the transfer process. As soon as the wooden articles 3 rest against the stops 46 distributed across the length of the advancing unit, the upper and the lower clamping jaws 54, 55 are moved toward one another by actuating the corresponding lifting cylinders 56, 72. In this way, the wooden articles 3 are clamped optimally between the clamping jaws 54, 55 of the advancing unit 15. The clamping action is such that the longitudinal side of the wooden articles 3 to be machined by the longitudinal profiling tools 18 is exposed so that this longitudinal side can be machined without being impeded by the clamping jaws 54, 55. During the longitudinal profiling action, the advancing unit 15 is reliably moved along the guide rails 50, 51. Since the guide elements 49 are distributed across the length of the carrier 47 and, moreover, are fastened in two horizontal rows positioned above one another at a sufficient spacing relative to one another, the carrier 47 can be moved problem-free and without the risk of canting. In this way, a very precise machining of the wooden articles 3 is ensured.
The advancing unit 15 not only provides the transport device for the wooden articles in the longitudinal profiling unit 2 but simultaneously also the clamping device. In this way, a highly precise machining of the wooden articles is optimally ensured also during the longitudinal profiling process.
As shown in
By means of
The transport unit 77 has a plate-shaped carrier 78 which has spaced-apart pressing jaws 79 at the side facing the wooden article 3. The pressing jaws 79 extend across the height of the carrier 78 and the wooden article 3. The end faces of the pressing jaws 79 are rounded so that they only with a line contour on the wooden article 3. The transport unit 77 is adjusted by means of a drive (not illustrated), preferably by lifting cylinders, in the direction toward the stops 46 of the advancing unit 15.
The transport unit 77 is located in the transition area of the wooden articles 3 from the transverse to the longitudinal profiling unit and is a component of the transfer unit 36. The transport unit 77 is actuated when the wooden articles 3 are moved between the opened clamping jaws 54, 55 of the advancing unit 15. The clamping jaws 54, 55 remain open until the wooden article 3 has been brought into contact with the stops 46 by means of the transport unit 77. Now the clamping jaws 54, 55 of the advancing unit 15 are actuated so that they clamp the wooden article 3. Only after this clamping process has been completed, the transport unit 77 is returned into its initial position.
Wooden articles 3 which have over their length a slight curvature can also be pressed straight by means of the transport unit 77 in order to be able to properly machine such wooden articles despite their longitudinal curvature. When the curved wooden article 3 is brought into contact in the described way with the transport unit 67 against the stops 46 of the advancing unit 15, the transport unit 77 is moved by means of further pressure loading farther in the direction to the stops 46. In this way, the wooden article 3 is straightened while resting against the stops 46 (
The two advancing units 15 are moved in the described way on opposed sides on a frame part 81 by means of the guide rails 50, 51.
In another embodiment, not illustrated, the machine is provided with advancing units 15 which are arranged in pairs atop one another; the upper advancing units are arranged mirror-symmetrically relative to a horizontal axis above the lower advancing units 15. With such a configuration the output of the machine is increased because one advancing unit has been returned already into the respective transfer position while the second advancing unit guides the wooden article 3 past the respective longitudinal profiling unit.
The longitudinal advancing action of the wooden articles 3 in the longitudinal profiling unit 2 by means of the advancing unit 15 enables an exact monitoring, measuring, and positioning of the wooden articles by means of axes. In this way, a high manufacturing precision and high process reliability are insured. The milling and drilling actions are performed in one machine so that a complete machining of the parts is possible on the machine. The wooden articles 3 during their transport through the transverse and the longitudinal profiling units 1, 2 are always clamped and cannot slide on the table surfaces or stops, the corresponding side of the wooden articles is treated gently. Also, no rolling of cuttings into the surface occurs. By means of the advancing unit 15 and the clamping device 4, it is possible to move the wooden articles 3 several times past the corresponding tools 11, 18 in order to carry out machining actions on the wooden article 3. In this connection, the corresponding spindles 10, 17 are adjusted radially and/or axially in order to engage the wooden article with the cutting knives required for different machining.
Since the wooden articles 3 during the entire machining and also during the different transfer procedures are clamped fixedly, the position of the wooden articles 3 can be precisely determined at any point in time. In this way, it is possible to machine the wooden articles 3 with this machine with high manufacturing precision. In particular, this enables in the described way that the bores and/or milling cuts can be machined in the longitudinal profiling unit 2 with the drilling units 16 of the machine because the wooden articles 3 can be positioned precisely relative to the drilling units 16 by means of the advancing unit 15.
Since the drive of the advancing unit 15 is embodied as a CNC axis, it is also possible to perform immersion cuts on the wooden articles 3. This refers to profilings which do not extend over the entire length of the wooden article 3. As a result of the high positional precision, the corresponding tools can be exactly immersed into and removed from the wooden article.
Since the advancing unit 15 is moved by CNC control and the tools 18 and their spindles 17 are moveable by CNC-control transversely to the movement direction of the advancing unit 15, by interpolation of these two perpendicularly positioned movement directions of the spindle 17 and the advancing unit 15 any contour of the longitudinal side of the wooden articles can be obtained. For example, it is possible to produce on the wooden articles curved profiles, wave lines and the like without problems.
With the clamping device 4 and the advancing unit 15 it is also possible to reliably machine very short wooden articles 3. In this way, complex customized manufacture is eliminated.
The machine parts are embodied as modules so that the machines can be combined in different ways. The configuration of the machine is independent from its length because a corresponding number of modules can be combined for a corresponding machining length. The modules can be combined such to a machine that it can be used as a right-handed or left-handed unit.
The magazine 24 (
Since the wooden articles 3 are not transported through the machine while resting against a stop but are instead clamped by means of the clamping device 4 or the advancing unit 15, a variable material removal on the wooden article 3 can be controlled without problems via the spindle position. This results in a high flexibility and an optimal lumber use.
The spindle guides are comprised advantageously of concrete polymer so that an optimal vibration decoupling of the spindles can be achieved.
The spindles can have, for example, a length of 700 mm and a variable stroke of 650 mm. In this way, complete freedom with regard to the spindle use, i.e., the selection of the tools to be fastened on the spindle, is provided. This provides a simple project planning of the wood machining process.
Since all wooden article and tool movements are realized by control of the electric axes, a high precision, a great variability as well as a significant simplification of project planning are obtained. Since via the controlled axes a precise knowledge of the position of the wooden article 3 within the machine is ensured, it is possible to eliminate light barriers which are employed in conventional window making machines and often represent significant sources of errors in the prior art window making machines. When the machine is configured as a continuous device according to
Since the wooden articles 3 are transported by the clamping device 4 or the advancing unit 15 during transverse and longitudinal profiling, the tabletops for supporting and propping up the wooden articles are no longer required. The problems which occur in this connection with regard to wear and guide interruptions in the area of the spindles are thus eliminated. Also, the stops to the right required in conventional window making machines, which cause problems with regard to wear, milling work and adjusting work, guide interruption in the area of the spindles as well as an optimal cuttings collection, can be eliminated.
The advancing units in the form of advancing rollers employed in conventional window making machines and the problems correlated therewith are eliminated. Advancing rollers are subject to wear and soiling so that the transport of the wooden articles through the window making machine is impeded. Moreover, the advancing rollers must be adjusted. As a result of the advancing beams the tools are difficult to access on the window making machine. The position of the wooden articles in the machine must be monitored for such an advancing unit by limit switches, and this can cause problems.
When the wooden articles are assembled to a window or door frame or wing, this frame or wing is subsequently transported through the window making machine and a circumferential milling action is performed. This circumferential milling action is impeded by the advancing beam. The milling action on smaller frames or wings requires an additional circumferential milling carriage. Such circumferential milling carriages are particularly unsuitable for studio windows in which the frame parts are connected to one another at angles different from 90°.
Such problems do not occur in the described machine because the advancing unit 15 can be used even for the circumferential milling action. As shown in
By means of the advancing unit 15 the wooden article 3 is secured during its transport through the machine, in particular, also in the area of the respective tools. In this way, a left pressing action, as provided with conventional window machines, can be eliminated. The fixed clamping action in all advancing and clamping devices does not cause depressions, grooves or the like in the wooden article 3.
By means of the drawings, the machine has been illustrated as an angled machine which has transverse and longitudinal profiling units 1, 2 positioned at a right angle to one another. The described advancing unit 15 can also be provided in a machine which does not have a transverse profiling unit and with which the wooden articles 3 are thus machined on at least one longitudinal side only.
The machine according to
During the transport in the transport direction 21 the wooden articles 3 first reach the working area of the tool 87 with which a corresponding machining on the end face 86 of the wooden articles 3 is performed. The tool 87 can be a removed from a tool magazine 88 in which milling cutters, drills, angle machining units, saws etc. are arranged. The tool 87 is positioned on a carriage 89 movable transversely to the transport direction 21 which can be moved along a guide 90 perpendicularly to the transport direction 21 in the transport direction 91 between the tool magazine 88 and the machining location. After machining of the end face 86, the wooden article 3 is transported by means of the advancing unit 15 in the transport direction 21 to a downstream tool 92. It is seated also on a carriage 93 which can be moved along a guide 95 perpendicularly to the transport direction 21 between an additional tool magazine 94 and its machining location. The tool magazine 94 can be identical to the tool magazine 88 and can have different tools for longitudinal machining, transverse machining, for boring or for sawing of the wooden articles 3. With the advancing unit 15 the wooden articles 3 are guided past the rotating tool 92 which machines the longitudinal side of the wooden article 3 to the right in the transport direction 21.
Once the longitudinal machining of the wooden article 3 is complete, the advancing unit 15 is returned counter to the transport direction 21 to the operator. After releasing the clamping device, the operator removes the wooden article 3 and turns it about its transverse axis by 180° (
With the described method the wooden article 3 is moved twice through the machine by means of the advancing unit 15 wherein for each pass through the machine an end face and a longitudinal side of the wooden article 3 is machined.
In the transport direction 21 behind the tool 92, the wooden article 3 is transferred to a second advancing unit 15 which is arranged mirror symmetrically on the opposite side of the guide 97 for the two advancing units 51. The wooden article 3 is transferred to the further advancing unit 15 such that the wooden article 3 projects past this advancing unit 15 with its end pointing in a direction opposite to the transport direction 21. The additional advancing unit 15 also has clamping jaws 54, 55 with which the wooden article is clamped at the top and bottom side. Upon transfer, the wooden article 3 is clamped with the clamping jaws 54, 55 of the additional advancing unit 15 while the clamping jaws 54, 55 of the other advancing unit 15 still hold the wooden article 3 in the clamped position. In this way, a proper transfer of the wooden article 3 is ensured because it is always in a clamped position during this transfer.
After the transfer the additional advancing unit 15 is moved farther in the transport direction 21. By means of the tool 98, which is adjustable by a carriage 99 transversely to the transport direction 21, the longitudinal side of the wooden article 3 to the left in the transport direction 21 is machined. With the tool 100 downstream in the transport direction 21, which is also supported on a carriage 101, the trailing end face 96 of the wooden article 3 in the transport direction is machined subsequently.
After passing through the machine, the wooden article 3 has been machined on both end faces 86, 96 and the right and left longitudinal sides. The wooden article 3 is then removed from the advancing unit 15 and guided farther perpendicularly to the transport direction 21 after releasing the clamping device.
With this machine the wooden articles 3 are machined on its two opposed longitudinal sides by means of two advancing units 15 which are advantageously identical and arranged mirror-symmetrically to one another. This machine operates very productively. As has been described in connection with the embodiments of
As in the preceding embodiment, the machine has a magazine 88, 94 for the tools 86, 92, respectively. In this way, there is always one unit in use so that the machine has a high productivity and short throughput time. It is also possible to provide only one unit for longitudinal and transverse machining. In this case, however, an unproductive time period must be taken into account for the exchange of the tools for transverse and longitudinal machining.
Corresponding to the preceding embodiment, the machine according to
In the transport direction downstream of the tool 92 the second advancing unit 15 is positioned to which the wooden article 3 is transferred (
The clamping jaws 54 are provided at their contact side with frame seals 102 (
In the described embodiments, the upper and lower clamping jaws 54, 55 are staggered relative to one another. However, it is also possible to arrange not all of the clamping jaws 54, 55 so as to be staggered; instead, only some of these clamping jaws can be staggered. For example, the first upper and lower clamping jaws 54, 55 can be positioned precisely above one another while only the subsequently arranged clamping jaws 54, 55 are staggered. With such a configuration the wooden article 3 is safely and reliably clamped in the area of its end face for transverse machining. It is also possible to reliably clamp shorter wooden articles 3 in this way.
While specific embodiments of the invention have been shown and described in detail to illustrate the inventive principles, it will be understood that the invention may be embodied otherwise without departing from such principles.
| Number | Date | Country | Kind |
|---|---|---|---|
| 101 37 839 | Aug 2001 | DE | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 4694871 | Jenkner | Sep 1987 | A |
| 6170639 | Diederich | Jan 2001 | B1 |
| Number | Date | Country |
|---|---|---|
| 43 01 217 | Jul 1994 | DE |
| Number | Date | Country | |
|---|---|---|---|
| 20030024363 A1 | Feb 2003 | US |
