Patent Grant
12090681
This application is the U.S. National Phase of International Application No. PCT/JP2020/025604, filed Jun. 30, 2020, which claims priority to Japanese Patent Application No. 2019-141946, filed Aug. 1, 2019. The contents of both of those applications are incorporated by reference herein in their entirety.
The present invention relates to a knife carriage configured to have a long knife arranged in a direction orthogonal to both the axial direction and of a pair of cutting spindles and the vertical direction so as to face a log held between the pair of cutting spindles, the knife being configured so as to peel a veneer from the log held between the pair of cutting spindles. The knife carriage is also configured to have a long pressure bar for pressing a peeled portion of the veneer out of the log from the side opposite to the side where the knife is arranged with respect to the peeled portion. The present invention also relates to a rotary veneer lathe having the knife carriage and a veneer slicer having the knife carriage.
Japanese Utility Model Laid-Open No. 54-141096 describes a long pressure bar capable of suppressing the occurrence of cracks in a veneer. When a veneer is peeled out from a log with a knife while the log is rotatably held between cutting spindles, the pressure bar suppresses the occurrence of cracks in the veneer by pressing a peeled portion of the veneer from the side which is opposite to the side where the knife is arranged with respect to the peeled portion.
The pressure bar is divided into plural pieces along the longitudinal direction and attached to a pressure bar mount. This configuration allows the pressure bar to bend partially when the knife peels a knot part of the log or when a fragment or chip of the log enters the cutting edge, avoiding excessive pressing against the peeled portion by the pressure bar. As a result, it is possible to prevent the knot part from destruction and to prevent the knife from clogging due to the fragment or chip (including a powdery wood chip) of the log entering the cutting edge. Thus, the occurrence of rough surfaces of the veneer and the occurrence of thickness unevenness of the veneer are prevented, improving the quality of the veneer. Further, there occurs no problem that the accumulation of the powdery wood chips at the cutting edge would stop the peeling of the veneer.
However, in the pressure bar described in the above-mentioned publication, when the pressure bar is partially bent, the corner of the pressure bar that presses the peeled portion of the log without bending, more specifically, the corner of a chip attached to the pressure bar may come into contact with the peeled portion and damage the peeled veneer. Further, in the case of using the pressure bar described in the above-mentioned publication to peel a veneer from a log containing water, when the peeled portion is pressed by the pressure bar, the water seeping out from the peeled portion may flow out of a gap generated between the bent pressure bar and the non-bent pressure bar, which may make a linear stain adhere to the peeled veneer. Thus, the pressure bar described in the above-mentioned publication has room for improvement in terms of further enhancing the quality of the veneer to be peeled out.
The present invention has been made in view of the above, and it is an object of the present invention to provide a knife carriage that contributes to further enhancement in the quality of a veneer, a rotary veneer lathe having the knife carriage, and a veneer slicer having the knife carriage.
A knife carriage of the present invention, a rotary veneer lathe having the same, and a veneer slicer having the same use the following means to achieve the above-described object.
According to a preferred embodiment of the present invention, a knife carriage is configured to have a long knife and at least one long pressure bar, the knife being disposed to face wood including a log for peeling a veneer from the wood, the pressure bar configured to press a peeled portion of the veneer from a side opposite to the side where the knife is disposed with respect to the peeled portion. The knife carriage includes a knife mount, a pressure bar mount, and a support member. The knife mount extends in the longitudinal direction of the knife so that the knife is attached to it. The pressure bar mount is located above the knife mount and extends in the longitudinal direction of the pressure bar so that the pressure bar is attached to it. The support member is disposed between the pressure bar and the pressure bar mount for supporting the pressure bar. The support member includes at least one fixture to be fixed to the pressure bar mount, and first and second supports to be supported by the fixture in a state separated from each other in the extending direction of the pressure bar so as to support the pressure bar at both ends of the pressure bar. The first and second supports are supported by the fixture to be movable independently of each other in the direction away from the wood according to the magnitude of the reaction force of a pressing force of the pressure bar against the peeled portion, the reaction force acting on the first and second supports via the pressure bar. Here, the “move” in the present invention preferably means not only a mode in which the first and second supports entirely move, but also a mode in which the first and second supports partially move due to their swinging or deformation.
According to the present invention, the first and second supports are able to move independently of each other in the direction away from the wood, according to the magnitude of the reaction force of a pressing force acting on the first and second supports via the long pressure bar. Thus, the long pressure bar can be partially deformed (bent). In other words, when a knife peels a knot part of the log, or when a fragment or chip of the wood (including powdered wood chips) enters the cutting edge, the long pressure bar does not deform uniformly. The portion of the long pressure bar that presses the part where the wood knot part is present or the part corresponding to where the wood fragments or chips enter the cutting edge is able to greatly deform, while the other portion of the pressure bar is maintained with small deformation. As a result, the peeled portion can be pressed with an appropriate pressing force without being excessively pressed by the pressure bar. Further, according to the present invention, unlike a conventional pressure bar where the small pieces of the divided pressure bar do not deform independently from each other, when a veneer is peeled out while pressing the peeled portion of the wood with the pressure bar, the corner of small deformed pieces (i.e., the portions where three ridges constituting the pressure bar intersect) does not come into contact with the peeled portion of the wood and do not damage the peeled veneer. Further, even in the case of peeling a veneer from wood containing water, when the peeled portion is pressed by the pressure bar, and no water seeping out from it flows out of a gap between a bent piece and a non-bent one of the pressure bar. Thus, the veneer to be peeled will have no scratching nor linear stain on it. As a result, any degradation in quality of the resulting veneer can be well prevented. Also, there occurs no problem that the accumulation of the powdery wood chips at the cutting edge would stop the peeling of the veneer.
According to another embodiment of the knife carriage of the present invention, the support member further includes first and second fulcrum shafts for swingably supporting the first and second supports respectively relative to the fixture. The first and second fulcrum shafts are arranged parallel to the longitudinal direction of the pressure bar. The first and second supports include first and second ends that are supported by the first and second fulcrum shafts, third and fourth ends for supporting the pressure bar, and first and second connecting portions for connecting the first and second ends to the third and fourth ends.
According to the above-described embodiment, the first and second supports are movable with the simple configuration in the direction away from the wood.
According to another embodiment of the knife carriage of the present invention, first and second urging members are arranged between the third and fourth ends and the fixture and configured to urge the pressure bar in a direction away from the fixture via the first and second supports.
According to the above-described embodiment, even when the pressure bar moves in the direction away from the wood, the first and second urging members move the pressure bar to the original position (posture) with their restoring force. Thus, the peeled portion can be stably pressed with an appropriate pressing force.
According to another embodiment of the knife carriage of the present invention, the first and second ends have first and second extending portions that extend on the side, with respect to the first and second fulcrum shafts, opposite to the side where the third and fourth ends are arranged. Between the first and second extending portions and the fixture, third and fourth urging members are arranged for urging the pressure bar in a direction away from the fixture via the first and second supports.
According to the above-described embodiment, even when the pressure bar moves away from the wood, the third and fourth urging members are able to return the pressure bar to the original position (posture) by their restoring force. Thus, the peeled portion can be stably pressed with an appropriate pressing force. In addition, since the third and fourth urging members are arranged in the first and second extending portions, maintenance such as replacement of the first and second urging members is facilitated.
According to another embodiment of the knife carriage of the present invention, the first and second fulcrum shafts support first and second rollers on them, respectively. The first and second supports have a substantially L-shape in which the first and second ends are orthogonally connected to the first and second connecting portions. The first and second supports are also arranged to be in contact with the first and second rollers at their internal corners, respectively. The support member includes first and second bolts capable of fastening the first and second supports to the fixture and further includes fifth and sixth urging members disposed between the first and second supports and the first and second bolts for urging the first and second supports toward the first and second rollers.
According to the above-described embodiment, since the first and second supports are only urged toward the first and second rollers by the urging forces of the fifth and sixth urging members, the first and second supports are swingable about the first and second fulcrum shafts with respect to the fixture, and also ones of both end edge portions of the first and second supports in the axial direction of the first and second fulcrum shafts are swingable in a direction away from the first and second fulcrum shafts. Accordingly, the pressure bar becomes deformable more flexibly. As a result, the peeled portion can be more effectively pressed with an appropriate pressing force.
According to another embodiment of the knife carriage of the present invention, seventh and eighth urging members are arranged between the first and second supports and the fixture, for urging the pressure bar in a direction away from the fixture via the first and second supports.
According to the above-described embodiment, even when the pressure bar moves away from the wood, the seventh and eighth urging members are able to return the pressure bar to the original position (posture) by their restoring force. Thus, the peeled portion can be stably pressed with an appropriate pressing force.
According to the above-described embodiment, the first and second supports include fifth and sixth ends that are fixed to the fixture, and seventh and eighth ends that are free ends, without being fixed to the fixture, for supporting the pressure bar.
According to the above-described embodiment, the first and second supports are movable, with the simple configuration, in a direction away from wood. Further, even when the pressure bar moves in a direction away from the wood, the first and second supports return the pressure bar to the original position (posture) by their elastic force. Thus, the peeled portion can be stably pressed with an appropriate pressing force.
According to another embodiment of the knife carriage of the present invention, the movement rigidity of the first and second supports in a direction away from the wood is equal to or greater than the bending rigidity of the pressure bar. Here, the “movement rigidity” in the present invention is defined as the difficulty of the first and second supports for moving in a direction away from the wood.
According to the above-described embodiment, as the first and second supports move away from the wood, the pressure bar is able to effectively follow the movement of the first and second supports. Accordingly, excessive pressing against the peeled portion by the pressure bar can be more effectively suppressed.
According to another embodiment of the knife carriage of the present invention, the support member further includes a third support to be supported by the fixture at a position between the first and second supports. The third support is capable of supporting the pressure bar and is supported by the fixture so as to be movable in a direction away from the wood according to the magnitude of a reaction force of the pressing force acting on the third support via the pressure bar.
According to the above-described embodiment, since the pressure bar has three support points, the pressure bar can be deformed (bent) to the third order. That is, the pressure bar can produce finer partial deformation. Thus, the peeled portion can be pressed with a more appropriate pressing force without being excessively pressed.
According to another embodiment of the knife carriage of the present invention, the support member further includes a third fulcrum shaft capable of swingably supporting the third support with respect to the fixture. The third fulcrum shaft is arranged parallel to the longitudinal direction of the pressure bar. The third support includes a ninth end supported by the third fulcrum shaft, a tenth end capable of supporting the pressure bar, and a third connecting portion for connecting between the ninth end and the tenth end.
According to the above-described embodiment, the third support is movable, with the simple configuration, in a direction away from the wood.
According to another embodiment of the knife carriage of the present invention, a ninth urging member is disposed between the tenth end and the fixture for urging the pressure bar in a direction away from the fixture via the third support.
According to the above-described embodiment, even when the pressure bar moves in a direction away from the wood, the ninth urging member can return the pressure bar to the original position (posture) by the restoring force of the ninth urging member. Thus, the peeled portion can be stably pressed with an appropriate pressing force.
According to another embodiment of the knife carriage of the present invention, the ninth end has a third extending portion that extends on a side opposite to a side where the tenth end is disposed with respect to the third fulcrum shaft. Between the third extending portion and the fixture, a tenth urging member is disposed for urging the pressure bar in a direction away from the fixture via the third support.
According to the above-described embodiment, even when the pressure bar moves away from the wood, the tenth urging member is able to return the pressure bar to the original position (posture) by the restoring force of the tenth urging member. Thus, the peeled portion can be stably pressed with an appropriate pressing force. In addition, since the tenth urging member is arranged in the third extending portion, maintenance such as replacement of the tenth urging member is facilitated.
According to another embodiment of the knife carriage of the present invention, the third fulcrum shaft supports a third roller. The third support has a substantially L-shape in which the ninth end is orthogonally connected to the third connecting portion and is located so that an inner corner of the third support is in contact with the third roller. The support member further includes a third bolt capable of fastening the third support to the fixture and an eleventh urging member disposed between the third support and the third bolt for urging the third support toward the third roller.
According to the above-described embodiment, since the third support is only urged by the third roller with the urging force of the eleventh urging member, the third support is able to swing about the third fulcrum shaft with respect to the fixture, and also one of both end edge portions of the third support in the axial direction of the third fulcrum shaft is swingable in a direction away from the third fulcrum shafts. Accordingly, the pressure bar becomes deformable more flexibly. As a result, the peeled portion can be more effectively pressed with an appropriate pressing force.
According to another embodiment of the knife carriage of the present invention, a twelfth urging member is disposed between the third support and the fixture for urging the pressure bar in a direction away from the fixture via the third support.
According to the above-described embodiment, even in the case where the pressure bar moves in a direction away from the wood, the twelfth urging member is able to return the pressure bar to the original position (posture) by the restoring force of the twelfth urging member. Thus, the peeled portion can be stably pressed with an appropriate pressing force.
According to another embodiment of the knife carriage of the present invention, the third support has an eleventh end to be fixed to the fixture and a twelfth end as a free end, which is not fixed to the fixture, for supporting the pressure bar.
According to the above-described embodiment, the third support can move in a direction away from the wood with a simple configuration. Further, even when the pressure bar moves in a direction away from the wood, the third support can return the pressure bar to the original position (posture) by the elastic force of the third support itself. Thus, the peeled portion can be stably pressed with an appropriate pressing force.
According to another embodiment of the knife carriage of the present invention, the moving rigidity of the third support in the direction away from the wood is set to be equal to or greater than the bending rigidity of the pressure bar. Here, the “movement rigidity” in the present invention is defined as the difficulty of the third support moving away from the wood.
According to the above-described embodiment, the pressure bar can effectively follow the movement of the third support when the third support moves in a direction away from the wood. Thus, excessive pressing against the peeled portion by the pressure bar can be more effectively suppressed.
According to another embodiment of the knife carriage of the present invention, the pressure bar is composed of first and second pressure bars arranged in the longitudinal direction. The first support is able to support one end of the first pressure bar in the longitudinal direction. The second support is able to support one end of the second pressure bar in the longitudinal direction. The third support is able to support the other ends of the first and second pressure bars in the longitudinal direction.
According to the above-described embodiment, the support is facilitated to move in a direction away from the wood when the support supports a part of the pressure bar for pressing wood having a knot or a part of the pressure bar handling where a fragment or chip of the wood enters the cutting edge. At the same time, it is possible to reliably prevent the support that supports the other parts from moving away from the wood. Thus, the peeled portion can be pressed with an appropriate pressing force without being excessively pressed by the pressure bar. The other ends of the first and second pressure bars in the longitudinal direction are both supported by the third support, and thereby it is impossible that only one of the other ends of the first and second pressure bars in the longitudinal direction is deformed. For this reason, there is no possibility that one of the other ends in the longitudinal direction of the first and second pressure bars (i.e., the portions where the three ridgelines constituting the first and second pressure bars intersect) comes in contact with a veneer peeled out and damages it. Further, since the pressure bar is composed of plural bars in the longitudinal direction, each of the first and second pressure bars can be exchanged separately, which is reasonable.
According to another embodiment of the knife carriage of the present invention, the first and second pressure bars are supported by the third support in a state where the other ends of the first and second pressure bars in the longitudinal direction are in contact with each other.
According to the above-described embodiment, the first and second pressure bars are supported by the third support in a state where the other ends in the longitudinal direction of the first and second pressure bars are in contact with each other. Thus, even if the first and second pressure bars are deformed while the first, second, and third supports are moving away from the wood, it is possible to favorably suppress the formation of a gap between the first and second pressure bars. Thus, even when the veneer is peeled out from the wood containing water, the water seeping out from the peeled portion due to the pressing against the peeled portion by the pressure bar does not flow to the peeled veneer. As a result, the quality of a veneer to be peeled is not degraded due to linear stains on the veneer.
According to a preferred embodiment of a rotary veneer lathe of the present invention, a rotary veneer lathe for peeling veneers from a log is configured. The rotary veneer lathe includes a pair of cutting spindles capable of holding a log, a machine frame, and a knife carriage of any one of the above embodiments according to the present invention, the knife carriage being arranged in a direction orthogonal to both of the axial direction of the pair of cutting spindles and the vertical direction so as to face a log held between the spindles. The machine frame has a pair of vertical walls that rotatably support the pair of cutting spindles, and a pedestal connecting the pair of vertical walls.
A rotary veneer lathe of the present invention is equipped with a knife carriage of any one of the above aspects according to the present invention. Therefore, a rotary veneer lathe according to the present invention provides the effects similar to those from the knife carriage of the present invention, including: the effect of achieving both the securing of the proper pressing against the peeled portion of a veneer by the pressure bar and the suppression of the excessive pressing against the peeled portion by the pressure bar; the effect of preventing damage to the veneer by the corner of the pressure bar (the portion where three ridges that constitute the pressure bar intersect) coming into contact with the peeled portion; and the effect of preventing water from flowing out to the veneer and linear stains from attaching to the veneer when the veneer is peeled out from a log containing water, the water seeping out of the peeled portion due to pressing by the pressure bar against the peeled portion.
According to a preferred embodiment of a rotary veneer lathe of the present invention, a veneer slicer for peeling veneers from wood is configured. The veneer slicer includes a holding member capable of holding a wood, a machine frame, a knife carriage of any one of the above aspects according to the present invention. The machine frame has a pair of vertical walls that support the holding member, and a pedestal connecting between the pair of vertical walls. The knife carriage is arranged to face the wood held by the holding member.
A veneer slicer of the present invention is equipped with a knife carriage of any one of the above aspects according to the present invention. Therefore, a veneer slicer according to the present invention provides the effects similar to those from the knife carriage of the present invention, including: the effect of achieving both the securing of the proper pressing against the peeled portion of a veneer by the pressure bar and the suppression of the excessive pressing against the peeled portion by the pressure bar; the effect of preventing damage to the veneer by the corner of the pressure bar (the portion where three ridges that constitute the pressure bar intersect) coming into contact with the peeled portion; and the effect of preventing water from flowing out to a veneer and linear stains from attaching to the veneer when the veneer is peeled out from a log containing water, the water seeping out of the peeled portion due to pressing by the pressure bar against the peeled portion.
According to the above-described embodiments, the quality of the veneer can be further enhanced.
Next, the best embodiment for carrying out the present invention will be described using examples.
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The knife carriage 10 according to the embodiment of the present invention is configured as a mount for mounting a knife Kn and a long nosebar 20 for peeling out a veneer Ven from the log PW (see
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The nosebar mount 14 is disposed on an inclined surface 12b on the upper part of the knife mount 12 as shown in
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The stepped holes 33b, 33b have a large diameter on the side where the support 34 is arranged (the left side in
The compression coil spring CSPR has a length protruding from the main body 32a. Here, the compression coil spring CSPR has a spring constant set to a value at which the compression coil spring CSPR can press the peeled portion 90 of the log PW with an appropriate pressing force when the single plate Ven is peeled from the log PW by the knife Kn (see
The stepped holes 33c, 33c have a small diameter on the surface side (the right side in
The protrusion 32b is disposed substantially at the center of the main body 32a in the short direction (the lateral direction, and the left-right direction in
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The recesses 35b, 35b are open on the side where the fixtures 32 are arranged (the left side in
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The support members 30 are formed by assembling the supports 34 thus configured to the fixtures 32 in a swingable manner. First, each support 34 is assembled to each fixtures 32 so that the pair of holding parts 34b, 34b sandwich the protrusion 32b of the fixture 32 (see
Next, the threaded bolt BLT2 is screwed into the screw hole 35d (see
Subsequently, the compression coil springs CSPR are accommodated in the large-diameter portions of the pair of stepped holes 33b, 33b, the stopper bolt SBLT is inserted from the large-diameter portion side of the stepped hole 33a of each fixture 32, and the distal end of the SBLT is made to protrude from the through-hole 35a of the main body 34a of the support 34. Finally, a nut N is engaged with the distal end of the stopper bolt SBLT (see
Here, by adjusting the degree of engagement (screw amount) of the nut N, the positional relationship between the tip TP and the knife Kn attached to the nosebar 20 is adjusted. Specifically, the tip TP and the knife Kn are adjusted to be parallel to each other with a desired distance. Further, by adjusting the degree of engagement (screw amount) of the bolt BLT3, the spring force (restoring force) of the compression coil spring CSPR is adjusted to a desired value. After adjusting the spring force (restoring force) of the compression coil spring CSPR to a desired value, a nut N2 is tightened to restrict the axial movement of the bolt BLT3 with respect to the fixtures 32 (the axial position of the bolt BLT3 is fixed).
As described above, each support 34 is fixed to the corresponding fixture 32 in a state where the support 34 is urged by the compression coil spring CSPR in a direction away from the fixture 32 with a desired spring force (restoring force) and is swingable about the fulcrum shaft 39. Note that, after the plurality of support members 30 are attached to the nosebar mount 14, the long nosebar 20 is attached to the lower end of the supports 34 (the face of the main body 34a on the dead-end side of the recesses 35b, 35b, the lower end in
Next, a description is given to how the peeled portion 90 of the log PW is pressed by the nosebar 20 during the operation of the rotary veneer lathe 1 including the knife carriage 10 configured as described above. When the operation of the rotary veneer lathe 1 is started, the log PW held between the cutting spindles 2a and 2b is rotated, and the knife carriage 10 is moved (stepped forward) in a direction approaching the log PW. The knife Kn is then pressed against the rotating log PW, and the veneer Ven of a desired thickness is peeled out (see
At this time, as shown in
Here, when a knot part Sp of the log PW comes into contact with the nosebar 20 as shown in
Besides, the nosebar 20 extends as one body between the support members 30 arranged at both ends in the arrangement direction of the support members 30 (the extending direction of the nosebar mount 14, the left-right direction in
Naturally, once the knot part Sp stops contacting the nosebar 20, the spring force (restoring force) of the compression coil springs CSPR causes the supports 34 to swing toward the log PW around the fulcrum shaft 39 and return to the original position (posture) (the solid line in
According to the rotary veneer lathe 1 according to the embodiment of the present invention described above, the nosebar 20 is supported by the plurality of supports 34 arranged along the longitudinal direction of the nosebar 20, and the supports 34 are assembled to the fixtures 32 so that the supports 34 are able to swing independently of each other in a direction away from the log PW according to the magnitude of the reaction force of the pressing force acting on the supports 34 through the nosebar 20. Therefore, the nosebar 20 can be partially bent and deformed through the movement of each support 34. That is, when the knife Kn peels the knot part Sp of the log PW or when a fragment or chip of the log PW enters the cutting edge, the nosebar 20 is not uniformly deformed, but the portion of the nosebar 20 pressing where the knot part Sp is present or the portion of the nosebar 20 corresponding to the location where the fragment or chip of the log PW enters the cutting edge can be greatly deformed, while the deformation amount (the amount of movement) of the nosebar 20 in the other portions can be kept small. Thus, it is possible to achieve both the securing of the appropriate pressing force against the peeled portion 90 by the nosebar 20 and the suppression of excessive pressing against the peeled portion 90 by the nosebar 20. Naturally, there is no such problem that the peeling of the veneer Ven is stopped due to the accumulation of the powdery wood chips at the cutting edge.
Further, according to the rotary veneer lathe 1 according to the embodiment of the present invention, the long nosebar 20 is configured to be partially deformed, and not to be configured with small divided pieces such that the pieces are deformed independently of each other as in the related art. Therefore, the corner of the nosebar 20, more specifically, the portion where the three ridges of the tip TP attached to the nosebar 20 intersect, does not come into contact with the peeled portion 90 of the log PW, causing no scratch onto the veneer Ven. Further, even when the veneer Ven is peeled from the log PW containing water, the water seeping from the peeled portion 90 due to the pressing against the peeled portion 90 by the nosebar 20 does not flow out to the veneer Ven. Thus, no linear stain is made to the veneer Ven. Since there are a plurality of support points in the nosebar 20, the nosebar 20 can be bent and deformed in a plurality of orders. That is, partial deformation of the nosebar 20 can be caused more finely.
Furthermore, according to the rotary veneer lathe 1 according to the embodiment of the present invention, the fulcrum shaft 39 is disposed vertically above the supports 34, and the spring force (restoring force) from the compression coil springs CSPR acts on the supports 34 from below in the vertical direction. Thus, the swinging of the support can be realized with a simple configuration, and even if the supports 34 move in the direction in which the nosebar 20 moves away from the log PW, the supports 34 (nosebar 20) can be returned to the original position (posture) by the spring force (restoring force) of the coil springs CSPR. In the embodiment of the present invention, the bending rigidity of the nosebar 20 in the direction in which the peeled portion 90 of the log PW is pressed and the direction away from the peeled portion 90 is smaller than the spring constant of the compression coil springs CSPR. Accordingly, the nosebar 20 can be effectively deformed when the supports 34 swing away from the log PW.
In the present embodiment, the nosebar 20 has a length extending between the support members 30 arranged at both ends in the arrangement direction of the support members 30 (the extending direction of the nosebar mount 14, the left-right direction in
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According to the rotary veneer lathe 1 using the nosebars 120, 220 of the modifications, when the knife Kn peels the knot part Sp of the log PW or when a fragment or chip of the log PW enters the cutting edge, the nosebars 120, 220 are not uniformly deformed, but the bar parts of the nosebars 120, 220 pressing where the knot part Sp is present or the portion of the nosebars 120, 220 corresponding to the location where the fragment or chip of the log PW enters the cutting edge can be greatly deformed, while the deformation amount (the amount of movement) of the nosebars 120, 220 in the other portions can be kept small. Thus, it is possible to more effectively achieve both the securing of the appropriate pressing force against the peeled portion 90 by the nosebars 120, 220 and the suppression of excessive pressing against the peeled portion 90 by the nosebars 120, 220.
Further, unlike the long nosebar 20 of the present embodiment, the nosebars 120, 220 of the modifications are composed of small divided bar parts in the longitudinal direction, but the nosebars 120, 220 are supported by the support members 30 in a state where the end faces in the longitudinal direction of each of the nosebars 120, 220 are in contact with each other. Thus, when the nosebars 120, 220 are bent and deformed with the swinging of the supports 34, the ends of the nosebars 120, 220 adjacent in the longitudinal direction are simultaneously deformed (moved), and thereby the occurrence of scratches onto the peeled veneer Ven is well prevented, where the scratches are caused when a corner of the ends of the nosebars 120, 220 adjacent in the longitudinal direction (specifically, the portion where three ridges of the tip TP attached to the nosebars 120, 220 intersect) comes into contact with the peeled portion 90. Further, when the nosebars 120, 220 are bent and deformed accompanied with the swinging of the supports 34, no gap is generated between the nosebars 120, 220. Thus, even when a veneer Ven is peeled from the log PW containing water, the water seeping from the peeled portion 90 due to the pressing against the peeled portion 90 by the nosebars 120, 220 does not flow out to the veneer Ven. Thus, no linear stain is made to the veneer Ven.
The nosebars 120, 220 of the modifications are supported by the support members 30 in a state where the end faces of the nosebars 120, 220 in the longitudinal direction are in contact with each other, but the end faces of the nosebars 120, 220 in the longitudinal direction may not be in contact with each other.
In the present embodiment, the compression coil springs CSPR are disposed at a position below the fulcrum shaft 39 in the vertical direction and on the backside face of the main body 34a of the support 34 where the nosebar 20 is attached, so that the restoring force of the compression coil springs CSPR urges the nosebar 20 in a direction away from the fixture 32 via the supports 34, but the present invention is not limited thereto. For example, as illustrated by support members 330 of the modification in
Each fixture 332 of the modification has the same configuration as that of the fixtures 32 of the present embodiment described with reference to
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The knife carriage 10 using the support members 330 of the present modification provides the effects similar to those of the knife carriage 10 using the support members 30 of the present embodiment. As one of the effects, for example, when the knife Kn peels a knot part of the log PW or when a fragment or chip of the log PW enters the cutting edge, the pressure bar 20 does not deform uniformly, but the portion of the nosebar 20 pressing where the knot part Sp is present in the log PW or the portion of the nosebar 20 corresponding to the location where the fragment or chip of the log PW enters the cutting edge can be greatly deformed, while the deformation amount (the amount of movement) of the nosebar 20 in the other portions can be kept small: as a result, it is possible to achieve both the securing of the appropriate pressing force against the peeled portion 90 by the nosebar 20 and the suppression of excessive pressing against the peeled portion 90 by the nosebar 20. As another effect, the occurrence of scratches onto the peeled veneer Ven is well prevented, the scratches being caused when a corner of the nosebar 20 (specifically, the portion where three ridges of the tip TP attached to the nosebar 20 intersect) comes into contact with the peeled portion 90 of the log PW. Further, no gap is generated when the nosebar 20 is bent and deformed, and thereby, even when a veneer Ven is peeled from the log PW containing water, the water seeping from the peeled portion 90 due to the pressing against the peeled portion 90 by the nosebar 20 does not flow out to the veneer Ven.
According to the modification, since the tension coil springs PSPR are disposed vertically above the fulcrum shafts 39, maintenance such as replacement of the tension coil springs PSPR can be easily performed.
In the support members 30 and 330 of the present embodiment and the modification described above, the supports 34 are swingably supported by the fixtures 32 via the fulcrum shafts 39, but the present invention is not limited thereto. For example, as illustrated in a support member 430 of a modification shown in
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As shown in
As shown in
The knife carriage 10 using the support member 430 of the present modification provides the effects similar to those from the knife carriage 10 using the support member 30 according to the present embodiment. For example, when the knife Kn peels a knot part of the log PW or when a fragment or chip of the log PW enters the cutting edge, the pressure bar 20 does not deform uniformly, but the portion of the nosebar 20 pressing where the knot part Sp is present or the portion of the nosebar 20 corresponding to the location where the fragment or chip of the log PW enters the cutting edge can be greatly deformed, while the deformation amount (the amount of movement) of the nosebar 20 in the other portions can be kept small: as a result, it is possible to achieve both the securing of the appropriate pressing force against the peeled portion 90 by the nosebar 20 and the suppression of excessive pressing against the peeled portion 90 by the nosebar 20. As another effect, the occurrence of scratches onto the peeled veneer Ven is well prevented, the scratches being caused when a corner of the nosebar 20 (specifically, the portion where three ridges of the tip TP attached to the nosebar 20 intersect) comes into contact with the peeled portion 90 of the log PW. Further, no gap is generated when the nosebar 20 is bent and deformed, and thereby, even when a veneer Ven is peeled from the log PW containing water, the water seeping from the peeled portion 90 due to the pressing against the peeled portion 90 by the nosebar 20 does not flow out to the veneer Ven.
In the support member 430 of the present modification, since the support 434 is only urged by the rollers R, R by the urging force of the compression coil spring CSPR2, the support 434 is able to not only swing about the fulcrum shaft 439 with respect to the fixture 432 (swinging in the direction of arrow SD in
Further, according to the support member 430 of the modification, since the support 434 can swing away from one of the rollers R, R, the positional relationship between the tip TP attached to the nosebar 20 and the knife Kn can be adjusted more flexibly by controlling the degree of engagement (screw amount) of the nut N. For example, by tightening the nut N of the right support member 430 in
In the support members 30, 330, and 430 of the present embodiment and the modifications described above, the supports 34 and 434 are configured to swing, but the configuration is not limited thereto. For example, as illustrated in a support member 530 of a modification shown in
As shown in
The knife carriage 10 using the support member 530 of the present modification provides the effects similar to those from the knife carriage 10 using the support member 30 according to the present embodiment. For example, when the knife Kn peels a knot part Sp of the log PW or when a fragment or chip of the log PW enters the cutting edge, the pressure bar 20 does not deform uniformly, but the portion of the nosebar 20 pressing where the knot part Sp is present in the log PW or the portion of the nosebar 20 corresponding to the location where the fragment or chip of the log PW enters the cutting edge can be greatly deformed, while the deformation amount (the amount of movement) of the nosebar 20 in the other portions can be kept small: as a result, it is possible to achieve both the securing of the appropriate pressing force against the peeled portion 90 by the nosebar 20 and the suppression of excessive pressing against the peeled portion 90 by the nosebar 20. As another effect, the occurrence of scratches onto the peeled veneer Ven is well prevented, the scratches being caused when a corner of the nosebar 20 (specifically, the portion where three ridges of the tip TP attached to the nosebar 20 intersect) comes into contact with the peeled portion 90 of the log PW. Further, no gap is generated when the nosebar 20 is bent and deformed, and thereby, even when a veneer Ven is peeled from the log PW containing water, the water seeping from the peeled portion 90 due to the pressing against the peeled portion 90 by the nosebar 20 does not flow out to the veneer Ven.
In the support members 30, 330, 430, and 530 of the present embodiment and the above-described modifications, the compression coil spring CSPR, CSPR3 disposed between the supports 34, 334, 434, 534 and the fixtures 32, 332, 432, 532, or the spring force (restoring force) of the extension coil spring PSPR causes the nosebar 20 to press the peeled portion 90, but the present invention is not limited thereto. For example, by connecting a fluid cylinder to the supports 34, 334, 434, 534, a pressing force against the peeled portion 90 by the nosebar 20 may be generated.
In the support members 30, 330, 430, and 530 of the present embodiment and the above-described modifications, the supports 34, 334, 434, and 534 (nosebar 20) are assembled to the fixtures 32, 332, 432, and 532 so as to swing or move in a direction away from the log PW and return to the original position (posture) by the spring force (restoring force) of the compression coil springs CSPR, CSPR3 or the tension coil springs PSPR, but the present invention is not limited to the configuration. For example, as illustrated in a support member 630 of a modification shown in
As shown in
The knife carriage 10 using the support member 630 of the present modification provides the effects similar to those from the knife carriage 10 using the support member 30, 330, 530 according to the present embodiment. For example, when the knife Kn peels a knot part Sp of the log PW or when a fragment or chip of the log PW enters the cutting edge, the pressure bar 20 does not deform uniformly, but the portion of the nosebar 20 pressing where the knot part Sp is present or the portion of the nosebar 20 corresponding to the location where the fragment or chip of the log PW enters the cutting edge can be greatly deformed, while the deformation amount (the amount of movement) of the nosebar 20 in the other portions can be kept small: as a result, it is possible to achieve both the securing of the appropriate pressing force against the peeled portion 90 by the nosebar 20 and the suppression of excessive pressing against the peeled portion 90 by the nosebar 20. As another effect, the occurrence of scratches onto the peeled veneer Ven is well prevented, the scratches being caused when a corner of the nosebar 20 (specifically, the portion where three ridges of the tip TP attached to the nosebar 20 intersect) comes into contact with the peeled portion 90 of the log PW. Further, no gap is generated when the nosebar 20 is bent and deformed, and thereby, even when a veneer Ven is peeled from the log PW containing water, the water seeping from the peeled portion 90 due to the pressing against the peeled portion 90 by the nosebar 20 does not flow out to the veneer Ven.
In the support member 630 of the modification described above, the support 634 bent in the direction away from the peeled portion 90 returns to the original position (posture) by the elastic force of the support 634 itself, but the present invention is not limited thereto. For example, as shown in a support member 630A of a modification illustrated in
As shown in
As shown in
The support 634A has the same configuration as the support 634 of the support member 630 of the above-described modification, except that the support 634A has a through-hole 35a substantially at the center, as shown in
The knife carriage 10 using the support member 630A of the present modification provides the effects similar to those from the knife carriage 10 using the support member 630 according to the above modification. For example, when the knife Kn peels a knot part Sp of the log PW or when a fragment or chip of the log PW enters the cutting edge, the pressure bar 20 does not deform uniformly, but the portion of the nosebar 20 pressing where the knot part Sp is present in the log PW or the portion of the nosebar 20 corresponding to the location where the fragment or chip of the log PW enters the cutting edge can be greatly deformed, while the deformation amount (the amount of movement) of the nosebar 20 in the other portions can be kept small: as a result, it is possible to achieve both the securing of the appropriate pressing force against the peeled portion 90 by the nosebar 20 and the suppression of excessive pressing against the peeled portion 90 by the nosebar 20. As another effect, the occurrence of scratches onto the peeled veneer Ven is well prevented, the scratches being caused when a corner of the nosebar 20 (specifically, the portion where three ridges of the tip TP attached to the nosebar 20 intersect) comes into contact with the peeled portion 90 of the log PW. Further, no gap is generated when the nosebar 20 is bent and deformed, and thereby, even when a veneer Ven is peeled from the log PW containing water, the water seeping from the peeled portion 90 due to the pressing against the peeled portion 90 by the nosebar 20 does not flow out to the veneer Ven. Furthermore, when the knot part Sp stops contacting the nosebar 20, the support 634a swings in a direction approaching the log PW by the spring force (restoring force) of the compression coil spring CSPR, and the nosebar 20 returns to the original position (posture), and thereby an appropriate pressing force against the peeled portion 90 by the nosebar 20 are reliably secured.
In the present embodiment and the above-described modification, the rotary veneer lathe 1 has the fixtures 32, 332, 432, 532, and 632 separate from the nosebar mount 14, but the present invention is not limited thereto. For example, the fixtures 32, 332, 432, 532, and 632 may be integrally formed with the nosebar mount 14. In this case, the portion of the nosebar mount 14 for swingably supporting the supports 34, 334, 434, 534, 634 is an example of an embodiment corresponding to the “fixture” of the present invention.
In the present embodiment and the above-described modifications, the support members 30, 330, 430, 530, and 630 have a plurality of fixtures 32, 332, 432, 532, and 632, and each of the fixtures 32, 332, 432, and 632 is configured to swingably support the supports 34, 334, 434, 534, 634, but the present invention is not limited thereto. For example, the support members 30, 330, 430, 530, and 630 may have only one fixture 32, 332, 432, 532, 632, and the one fixture 32, 332, 432, 532, 632 may be configured to swingably support the plurality of supports 34, 334, 434, 534, 634 at predetermined intervals in the extending direction of the nosebar mount 14. In this case, the fixture 32, 332, 432, 532, and 632 can have a long shape extending in the longitudinal direction of the nosebar 20, 120, and 220.
In the present embodiment and the above-described modifications, the nosebar 20, 120, and 220 are used as a pressure bar, but the present invention is not limited thereto. For example, a roller bar may be used as the pressure bar.
The present embodiment and the above-described modification are applied to the rotary veneer lathe 1, but may be applied to the veneer slicer 701 as shown in
In the present embodiment and the above-described modification, a separate tip TP is attached to the nosebar 20. However, if the nosebar 20 is formed of the same material as that of the tip TP, a configuration without the tip TP may be adopted.
The present embodiment shows an example of a mode for carrying out the present invention. Therefore, the present invention is not limited to the configuration of the present embodiment. The correspondence between each component of the present embodiment and each component of the present invention is shown below.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2019-141946 | Aug 2019 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2020/025604 | 6/30/2020 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2021/020001 | 2/4/2021 | WO | A |
| Number | Name | Date | Kind |
|---|---|---|---|
| 2607377 | Merritt | Aug 1952 | A |
| 4061169 | Hasegawa | Dec 1977 | A |
| 4494589 | Kajikawa | Jan 1985 | A |
| 4753278 | Lorenzo | Jun 1988 | A |
| 5662151 | Koike | Sep 1997 | A |
| 6357496 | Koike | Mar 2002 | B1 |
| 20070209735 | Mawatari | Sep 2007 | A1 |
| Number | Date | Country |
|---|---|---|
| 2006200898 | Sep 2007 | AU |
| 2538050 | Aug 2007 | CA |
| 1825976 | Aug 2007 | EP |
| S51100398 | Sep 1976 | JP |
| S54-141096 | Mar 1978 | JP |
| S5384299 | Jul 1978 | JP |
| S5571503 | May 1980 | JP |
| H10180719 | Jul 1998 | JP |
| 2001079811 | Mar 2001 | JP |
| 2005169776 | Jun 2005 | JP |
| Entry |
|---|
| The Search Report from the corresponding International Patent Application No. PCT/JP2020/025604 mailed on Oct. 14, 2020. |
| Number | Date | Country | |
|---|---|---|---|
| 20220152866 A1 | May 2022 | US |
