JPH0432248Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a two-roller type outer peripheral drive device for veneer lace that supplies part or all of the driving force from the outer periphery of raw wood. .

(Prior Art) Conventionally, in this type of veneer lace that supplies part or all of the driving force from the outer periphery of the raw wood, there are two types in which the number of driving rollers is 3 and 2, for example. Yes, in the case of the three drive roller format, when the diameter of the log becomes small, the drive rollers interfere with each other, so in order to smoothly cut the log to a small diameter, the diameter of the drive roller must be reduced. There is a problem of not being able to If the diameter of the drive roller is made smaller, there is a problem in that the rigidity of the drive roller itself decreases and the driving force that can be transmitted becomes smaller. For this reason, a two-drive roller type is adopted, and an example of this two-drive roller type is the one disclosed in Japanese Patent Publication No. 54-37360. This publication describes a veneer manufacturing device equipped with a pair of driving roller bars that press the raw wood in the axial direction from both sides of the raw wood in the axial direction, and both roller bars are independent of each other. A configuration is disclosed in which a pressing mechanism such as an air cylinder, a hydraulic cylinder, or a feed screw is operated toward the center of the log. However, the pressing force of both roller bars during cutting of raw wood, i.e.
If there is a shift in the operating timing of the pressing mechanism, there will be a difference in the pressing force, which will cause the center of the log to shift, and there will be a problem that the thickness of the veneer to be cut cannot always be made uniform. In order to synchronously control the operating timing of this pressing mechanism, there is an electrical control means, but this electrical control means has the problem that equipment costs such as wiring and equipment are expensive.

(Problem to be solved by the invention) In view of the above-mentioned problems, the present invention aims to improve the synchronous operation of the cylinders that operate the two drive rollers during cutting of logs while maintaining the driving force from the outer periphery. The object of the present invention is to provide a two-roller type outer circumferential drive device that is capable of constantly cutting veneers of uniform thickness even when the diameter of logs is small by controlling the axial center of the log to prevent it from shifting. It is.

(Means for Solving the Problems) In order to solve the above-mentioned technical problems, the present invention provides a pair of main spindles respectively disposed on a pair of left and right headstocks arranged at a predetermined interval, and an axial center of the two main spindles. In a veneer race equipped with a pair of drive rollers for rotating logs arranged in parallel on both sides of the direction, two pairs of synchronous rotation shafts are arranged facing each other at positions equidistant from each of the main shafts. and a pair of rotating shafts in which the driving rollers are respectively attached, and the distances from the axis of each of the main shafts to the outer peripheral surface of each driving roller are equal, and both ends are respectively fixed to the two pairs of synchronous rotation shafts. a frame, a driving force transmitting shaft coaxially supported by each of the synchronous rotating shafts and rotated in series in conjunction with a power source, and a driving force interposed between the driving force transmitting shaft and the driving roller. a pair of slewing gears rotatably supported on the main shaft, two synchronous gears meshing with the slewing gears and fixed to the synchronous rotating shafts, and each of the slewing gears. A synchronizing means consisting of a pair of racks that mesh with gears and are moved forward and backward by a pair of cylinders, and a connecting shaft that has a pair of synchronizing pinions that mesh with the pair of racks, respectively, and synchronizes the movements of the two racks. The invention consists in a two-roller type outer peripheral drive device in a veneer lace constructed to be provided.

(Operation) When the log is supported by both main shafts, the pair of cylinders of the synchronizing means are operated simultaneously to move the racks on both sides in the same direction. This movement of both racks causes a pair of turning gears meshing with each rack to rotate in the same direction. Since the racks on both sides mesh with a pair of synchronizing pinions attached to the connecting shaft, they cannot move independently, but can be moved the same length in the same direction. Movement of the racks on both sides causes the pivot gears on both sides to rotate by the same angle in the same direction. Then, two synchronous gears each meshing with both of the rotation gears are rotated in a direction opposite to that of each of the rotation gears. Therefore, the synchronized rotation shafts on both sides attached to both ends of each rotation frame are synchronously rotated in the same direction, and the two drive rollers attached to each rotation frame are aligned with each other around the axis of the main shaft. It is approached from above and below in synchronization with the core, that is, the axis of the raw wood, while keeping an equal distance from it.

As a result, the axis of the log will not shift during cutting, and a veneer of uniform thickness will always be cut.

(Example) Next, this invention will be explained based on an example shown in the drawings.

In the figure, the two main shafts 2, 2 supported by the left and right headstocks 1, 1 of the veneer race L, respectively, are not shown, but one of the main shafts 2 is driven by an appropriate drive means from a drive shaft 13 of a drive motor M. Two synchronous rotation shafts 3, 3 are supported facing each other at equal distances from the main shafts 2, 2, and a pair of left and right synchronous rotation shafts 3, 3 are supported by a rotation frame 4. Both ends are fixed, and drive rollers R1 and R2 are supported at the tip of each rotating frame 4, respectively. The drive rollers R1 and R2 are arranged so as to substantially face each other in the vertical direction.

As shown in FIGS. 2 and 4, the synchronous rotation shaft 3
The driving force transmitting shafts 11 of the driving rollers R1 and R2 are rotatably supported coaxially, and a chain wheel 12 is attached to the end of each driving force transmitting shaft 11, respectively. Further, the drive shaft 13 of the drive motor M is rotatably provided between the left and right headstocks 1, 1, and the drive shaft 13 has a chain wheel 12 attached to the drive force transmission shaft 11, and a chain wheel 13 corresponding to the chain wheel 12 attached to the drive force transmission shaft 11. 14 is attached, and as shown in Fig. 2, the left and right chain wheels 14, 12,
A chain 15 is hung between 12. The driving force of this drive motor M is transmitted to the driving force transmission shaft 1.
1 and the shafts 16 of the drive rollers R1, R2 via the drive force transmission means A interposed between the shafts 16 of the drive rollers R1, R2.
2 and rotate synchronously.

Further, in this embodiment, the driving rollers R1 and R2 have a structure in which a plurality of rubber rollers 17 are intermittently fitted into a metal shaft 16, and the rubber rollers 17 press the surface of the log W to cause elastic deformation. As a result, the contact area between the rubber roller 17 and the log W becomes larger, and the friction force between the rubber roller 17, which has a larger contact area, and the log W causes the log W to be removed from the driving rollers R1 and R2.
The driving force is transmitted to the

On the other hand, each main shaft 2 rotatably supports a turning gear 5 concentric with the main shaft 2, and two synchronous gears 6, 6 mesh with each turning gear 5.
Each synchronous gear 6 is fixed to the synchronous rotation shaft 3, respectively.

A rack 7 is disposed on the headstock 1 below each turning gear 5 so as to be movable in the horizontal direction (in the left-right direction in FIG. ing. Also, the racks 7 on both sides
Left and right synchronizing pinions 8, 8 attached to both ends of a connecting shaft 9 rotatably supported by the head stock 1 are meshed and connected to the lower teeth 7b, respectively. Each rack 7 has a rod 2 of cylinder 10.
1 is connected, and the rod 21 of this cylinder 10
By rotating the turning gear 5 by the extension operation, the two synchronizing gears 6 rotate in synchronization with each other in the same direction. That is, in FIGS. 2 and 5, when each rod 21 of the left and right cylinders 10 is extended and moves the racks 7, 7 on both sides to the right in the figure, the left and right turning gears 5, 5 move. It is rotated in the direction of arrow P. Here, for both racks 7 and 7,
Since the synchronizing pinions 8 and 8 at both ends of the connecting shaft 9 are in mesh with each other, for example, if the operating timing of one cylinder 10 deviates, the other cylinder 1
Even if 0 tries to operate, the synchronizing pinion 8 on the lagging side will be locked, so this is to compensate for the difference in the operating timing and synchronize, so that the left and right cylinders 10, 10 can move. Each rack 7,7 cannot be moved independently, but is moved synchronously and by the same length in the same direction. For this reason, the left and right turning gears 5, 5 are synchronously rotated in the same direction by the same angle, and the two synchronous gears 6, 6 meshing with both turning gears 5, 5, respectively, are synchronously rotated with each other. It is rotated in the opposite direction to the turning gears 5,5. As a result, both rotating frames 4, 4 are synchronously rotated in the same direction, and the two drive rollers R1, R2 are synchronously approached with respect to the axis of the main shaft 2 from above and below.

In the same manner as described above, when the rod 21 is shortened, the two drive rollers R1 and R2 move in synchronization with each other in a direction away from the axis of the main shaft 2.

In addition, in the figure, B is the tool rest, C and C are the main shafts 2 on both sides,
chuck attached to 2, 18 a knife, 19
20 indicates a roller bar, and 20 indicates a veneer veneer.

In order to cut the log W by supplying driving force from the outer periphery of the log W, each rod 21 of both cylinders 10, 10 is shortened, and both turning gears 5, 5 are cut.
By rotating the drive rollers R1 and R2 in the direction of arrow P', the drive rollers R1 and R2 are largely separated from the main shafts 2 and 2 (see FIG. 6A), and the turret B is moved largely backward. Next, the raw wood W to be cut is placed between the chucks C and C, and both end faces of the log W are held between the chucks C and C.

Next, the drive motor M is started and the drive force is transmitted to the drive rollers R1 and R2 via the drive force transmission means A to rotate the drive rollers R1 and R2.
By gradually extending the rods 21, 21 of 0 and 10, the two turning gears 5, 5 are gradually turned in the direction of arrow P, and the rotating drive rollers R1,
Each rubber roller 17 of R2 presses the surface of the log W. As described above, when the rubber roller 17 presses the surface of the log W, the driving force of the drive rollers R1 and R2 is transmitted to the log W, causing the log W to rotate. Then, as shown in FIG. 6B, when the tool rest B is advanced at a predetermined speed, the raw wood W is continuously cut by the cutter 18, and the veneer veneer 20 is obtained.

As described above, the drive rollers R1 and R2 are connected to a pair of rotating gears 5 rotatably supported on the main shaft 2, and two synchronous gears meshing with the rotating gears 5 and fixed to the synchronous rotating shaft 3, respectively. Gear 6 and
A connection that synchronizes the movement of both racks 7, which has a pair of racks 7 that mesh with each turning gear 5 and are moved forward and backward by a pair of cylinders 10, and a pair of synchronizing pinions 8 that mesh with the pair of racks 7, respectively. By incorporating a synchronizing means with an extremely simple mechanical structure consisting of the shaft 9, the log W approaches the main shaft 2 in synchronization with each other as it is cut, so that the axial center of the log W does not shift during cutting. , cutting smoothly from beginning to end. If you continue cutting in this state, the drive rollers R1 and R2 will
Because they are books, they do not interfere with each other,
Therefore, as shown in FIG. 6C, it becomes possible to cut the log W until it has an extremely small diameter.

Incidentally, in the description of the above embodiment, the case where all the driving force to be supplied to the raw wood W is supplied from the drive rollers R1 and R2 was explained, but the drive rollers R1 and R
Of course, it is also possible to supply from both chucks C and C, and the configuration of the drive roller is not limited to the above. For example, a large number of grooves are provided on the outer periphery of a metal roller. It can be something.

(Effect of the invention) As described above, the driving roller of the present invention includes a pair of turning gears rotatably supported on the main shaft, and two turning gears meshing with the turning gears and fixed to the synchronous rotating shaft. A synchronizing gear, a pair of racks that mesh with each of the swing gears and are moved forward and backward by a pair of cylinders, and a connecting shaft that has a pair of synchronizing pinions that mesh with the pair of racks and synchronizes the movement of both racks. By incorporating a synchronizing means with an extremely simple mechanical structure consisting of the
The pair of drive rollers maintains the same distance from above and below the axis of the log and presses it synchronously, so the axis of the log does not shift during cutting, and the axis remains constant until the diameter of the log is reduced. Can cut veneer with uniform thickness.

[Brief explanation of the drawing]

The figures show one embodiment of this invention, in which Figure 1 is a side view of a veneer race equipped with a two-roller type outer peripheral drive device, Figure 2 is a side view of a drive roller synchronization means, and Figure 3 is a side view of a veneer race equipped with a two-roller type outer peripheral drive device. Figure 4 is a front view of the driving force transmission means for transmitting driving force to both drive rollers, Figure 5 is a rack provided on each headstock,
FIG. 6 is a plan view showing the positional relationship between the synchronizing pinion and the cylinder. FIG. A...driving force transmission means, L...veneer lace,
M...drive motor, R1, R2...drive roller,
W... Log, 1... Headstock, 2... Spindle, 3...
Synchronous rotation axis, 4... Swivel frame, 5... Swivel gear, 6
...Synchronous gear, 7...Rack, 8...Synchronous pinion, 9...Connection shaft, 10...Cylinder.

Claims (1)

[Scope of utility model registration request] It is equipped with a pair of main shafts respectively arranged on a pair of left and right headstocks arranged at a predetermined interval, and a pair of drive rollers for rotating logs arranged in parallel on both sides in the axial direction of both main shafts. In the veneer race, two pairs of synchronous rotating shafts are disposed facing each other at positions equidistant from each of the main shafts, and the driving rollers are respectively attached, and the axis of each of the main shafts is connected to each of the driving rollers. a pair of rotating frames whose ends are fixed to the two pairs of synchronous rotating shafts with equal distances from each other to the outer circumferential surface of the frame; a driving force transmitting shaft that is rotated by the main shaft, and a driving force transmitting means interposed between the driving force transmitting shaft and the drive roller, and a pair of rotating shafts each rotatably supported on the main shaft. A gear, two synchronous gears that mesh with the swing gear and are each fixed to a synchronous rotating shaft, a pair of racks that mesh with each of the swing gears and are moved forward and backward by a pair of cylinders, and A two-roller type outer circumferential drive device for a veneer race comprising a synchronizing means comprising a pair of synchronizing pinions meshing with the respective racks, and a connecting shaft synchronizing the movements of both the racks.