JPS5857281B2 - How to form small cracks in plywood veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for forming small cracks in a veneer veneer.

Traditionally, veneer veneers (hereinafter simply referred to as veneers) have been treated to form small cracks in order to eliminate cracks, make them homogenized, and prevent overlapping. One example of this device is one that bends a veneer with a small radius of curvature to create small cracks from one side, and another example uses a soft rubber elastic roller to bend the veneer from both sides. Transport while pressurizing,
There is an apparatus that sequentially forms small cracks in a veneer by using a tensile force generated by the distortion of an elastic body.

The drawbacks of the device that uses the spacing are that it is not effective for thin veneers, and it is not possible to increase the elongation rate of the veneer due to small cracks beyond a certain level, and the pitch of the small cracks becomes small. , there is a risk of reducing the compressive strength in the thickness direction of the veneer.On the other hand, the drawbacks of devices that utilize the tensile force generated by the distortion of the elastic body are that the elastic body is subject to rapid wear and tear due to the difference in the material of the veneer. The degree of cracking varies significantly, and its effectiveness on thick veneers is poor.

The present invention was developed in order to eliminate the drawbacks of the conventional apparatus, and has a simple structure with almost no wear and tear, and can stably obtain a desired small size almost unaffected by the thickness or material of the veneer. The present invention aims to provide a device capable of forming cracks and contribute to the rationalization of the veneer softening process in plywood factories.

That is, the device according to the first aspect of the present invention is arranged such that the rollers are arranged at an appropriate interval from the axis of the carry-in roller group, which is formed from a plurality of narrow rollers arranged at an appropriate interval. In order to bring the axes of the carry-out roller group made up of a plurality of narrow rollers very close to each other, the narrow rollers on both sides are arranged in an alternating manner, and the carry-in roller group and the carry-out roller group are arranged in a staggered manner. In order to drive each of the side roller groups, one or more driving shafts are arranged at appropriate positions, and the circumferential speed of the unloading roller group is continuously made larger than the circumferential speed of the unloading roller group via the shaft. A conveying mechanism configured to drive the veneer in a direction perpendicular to the fibers is provided with a veneer support mechanism of an appropriate form for supporting the veneer through a path of the veneer, Further, the device according to the second invention of the present invention is arranged such that the rollers are arranged at an appropriate interval from the axis of the carry-in roller group which is formed from a plurality of narrow rollers arranged at an appropriate interval. In order to bring the axes of the carry-out roller group made up of a plurality of narrow rollers very close to each other, the narrow rollers on both sides are arranged in an alternating manner, and the carry-in roller group and the carry-out roller group are arranged in a staggered manner. In order to drive each of the side roller groups separately, a plurality of drive shafts are arranged at appropriate positions, and an appropriate speed change mechanism is attached to one of the plurality of drive shafts, and the speed change mechanism and a shaft configured to drive the unloading roller group by periodically increasing the peripheral speed of the unloading roller group than the peripheral speed of the loading roller group.
A conveyance mechanism that conveys the veneer in a direction orthogonal to the fibers is provided with a veneer support mechanism of an appropriate form that supports the veneer through the path of the veneer, each continuously or periodically. By setting a difference in the circumferential speed of the carry-in roller group and the carry-out roller group of the conveyance mechanism, tensile force is applied to the veneer, and small cracks are formed in the veneer one after another. It has a simple structure with almost no wear and tear, and can stably form the desired small cracks without being affected by the thickness or material of the veneer. It is also possible to easily change the spacing, which is of high practical value in plywood factories.

The present invention will be described below based on an example of implementation illustrated in the drawings.

FIG. 1 is a side explanatory view for explaining the apparatus according to the first aspect of the present invention, and FIG. 2 is a plan view of FIG. 1.

In the figure, reference numeral 4 indicates narrow rollers, and a plurality of rollers constitute a carry-in roller group.

Reference numeral 3 denotes narrow rollers arranged alternately between the plurality of narrow rollers 4, and a plurality of narrow rollers 3 constitute a group of rollers on the carry-out side.

Reference numerals 1 and 2 are shafts disposed in contact with the outer periphery of each of the roller groups. Drive each roller group so that

In other words, the axes of the carry-in roller group consisting of a plurality of narrow rollers 4 and the carry-out roller group consisting of a plurality of narrow rollers 3 whose circumferential speed is higher than that of the carry-in roller group are They are brought very close together to form a conveyance mechanism that conveys the veneer 9 in a direction orthogonal to the fibers.

Reference numeral 5 indicates an arm that supports the roller 3, and 6 indicates an arm that supports the roller 4. Reference numeral 7 indicates a spring attached to the arm 5, and reference numeral 8 indicates a spring attached to the arm 6.

4a is a plurality of narrow rollers supported by an arm 6a attached with a spring 8a and driven via a shaft 1a; 3a is a plurality of narrow rollers supported by an arm 5a attached with a spring 7a and driven via the shaft 2a; A plurality of narrow rollers driven at a circumferential speed faster than It constitutes a veneer support mechanism facing the.

The device according to the first aspect of the present invention is configured as described above, and when a veneer is inserted into the device in a direction perpendicular to the fibers, the difference in circumferential speed causes the roller group on the carry-in side and the roller group on the carry-out side to A tensile force is applied to the veneer between the roller group and the tensile force causes small cracks to be formed in the veneer one after another, but the points where the tensile force is applied are staggered and very close to each other. Because it is fixed and fixed, small cracks that are not continuous across the entire width can be stably formed without being affected by the thickness or material of the veneer, and the spacing between the small cracks and The gap can be made relatively large, and while avoiding the risk of reducing the compressive strength in the thickness direction,
It enables softening treatment to eliminate cracks, homogenize, and prevent overlap, as well as improve yield through stretching.
Enables the development of new veneer applications.

The formation of small cracks varies depending on the number of rollers in each group of rollers located on the carry-in side and the carry-out side of the conveyance mechanism, the size of the difference in circumferential speed, the distance between the axes, etc., but in general, the number of rollers The larger the difference in circumferential speed is, the more the small cracks are dispersed, the larger the difference in circumferential speed, the narrower the interval, and the larger the distance between the axes, the wider the interval.

Furthermore, if the veneer support mechanism is equipped with a conveyance mechanism and a mechanism to intimidate the object, as in the above embodiment, so that tensile force can be applied from both sides of the veneer, processing can be carried out more stably. Although it is preferable, the veneer support mechanism is not necessarily limited to a conveyance mechanism and a mechanism that forces the object. For example, even if the veneer support mechanism in the above embodiment is omitted from the shafts 1a and 2a, the veneer support mechanism is essentially a conveyance mechanism. Any form of veneer support mechanism may be used as long as it has a configuration that can provide a pressurizing effect to allow the conveyance force of the mechanism to act on the veneer.

In the embodiment illustrated in FIG. 3, a plurality of narrow rollers 13 constituting a carry-in roller group are attached to a main shaft 34 and driven, and a plurality of ring-shaped narrow rollers constituting a carry-out roller group are driven. The roller 12 is supported by shafts 10 and 11 provided on the outer periphery, and is driven via either one of the shafts 10 or 11 to constitute a conveying mechanism, and furthermore, the roller 12 is supported by shafts 10 and 11 provided on the outer periphery. A veneer support mechanism consisting of a plurality of ring-shaped narrow rollers 12a supported and driven via either one of the shafts 10a or 11a, and a plurality of narrow rollers 13a attached to the main shaft 34a, It is installed opposite to the conveyance mechanism via the passage of the veneer 14, and the fifth
In the embodiment illustrated in the figure, a plurality of narrow rollers 24 constituting a group of rollers on the carry-in side are provided with shafts 19 and 2 on their outer peripheries.
shafts 20 and 22, which are supported by shafts 19 and 21 and are provided with a plurality of ring-shaped narrow rollers 23 on their outer peripheries, which are driven through either one of the shafts 19 or 21, and which constitute a group of rollers on the delivery side.
The transport mechanism is constructed by being supported by shafts 19a and 21a provided on the outer periphery and driven through either one of the shafts 20 or 22.
A plurality of narrow rollers 24a are driven through either one of a, and a plurality of narrow rollers 24a are supported by shafts 20a and 22a provided on the outer periphery and are driven through either one of the shafts 20a or 22a. A veneer support mechanism consisting of a ring-shaped narrow roller 23a is provided opposite to the conveyance mechanism via a path of the veneer 25, and both have a simpler structure than the previous embodiment. Furthermore, if necessary, it is possible to further close the axial gaps between the rollers of the carry-in and carry-out roller groups.

Note that, if necessary, the ring-shaped narrow roller can be supported by providing a support shaft on its inner periphery, but in any case, it is necessary to support it at at least two points.

Further, in the embodiment illustrated in FIG. 4, a plurality of narrow rollers 1γ constituting the carry-in roller group are attached to the main shaft 18 and driven, and a plurality of ring-shaped narrow rollers 1γ constituting the carry-in roller group are driven. A tooth profile is formed on the inner periphery of the narrow roller 16 and meshes with a tooth profile formed on the outer periphery of the main shaft 18, and the main shaft 1 is supported by the shaft 15 provided on the outer periphery and the main shaft 18.
8, and the veneer support mechanism is not shown for convenience, but since the loading and unloading roller groups are driven by one main shaft,
Although the device has the advantage of being simpler in structure than the three embodiments described above, it cannot be applied to the device according to the second invention described later.

Whereas the device according to the first aspect of the present invention is configured to drive the output roller group at a circumferential speed that is continuously higher than the circumferential speed of the carry-in roller group, the present invention The device according to the second aspect of the present invention is configured to be driven so that the circumferential speed of the unloading roller group is periodically made higher than the circumferential speed of the loading roller group.

That is, FIG. 6 is an explanatory side view of the transmission mechanism used in the device according to the second aspect of the present invention.

In the figure, reference numeral 27 denotes a plurality of ring-shaped narrow rollers, which are supported by shafts 26 and 28 and constitute a group of rollers on the carry-in side or the carry-out side of the conveyance mechanism.

31 is a chain, and a chain wheel 32 is attached to the shaft 28 that drives the plurality of ring-shaped narrow rollers 27;
As the chain wheel 30, which is suspended somewhat loosely from a chain wheel 33 attached to a drive source 29 such as a motor, and which is disposed at the middle part of the chain 31 so as to be movable in the direction of the arrow shown in the figure, moves back and forth, the solid line The power of the drive source 29 is transmitted to the ring-shaped narrow roller 27 via the shaft 28 while being periodically displaced from the state shown by the dotted line to the state shown by the chain line.

For example, according to the transmission mechanism configured as described above, the chain 31 is periodically displaced from the state shown by the solid line to the state shown by the chain line as the queener 30 reciprocates, so that the drive source 29 rotates at a constant speed. Also, the circumferential speed of the ring-shaped narrow roller 27 increases and decreases periodically.

Therefore, for example, a transmission mechanism having the above-mentioned configuration may be used as a conveyance mechanism having the same configuration as the conveyance mechanism of the embodiment illustrated in FIGS. 1, 2, 3, and 5, except for the drive form. of,
By attaching it to the shaft that drives one of the plurality of narrow rollers constituting the carry-in side or carry-out side roller group, and periodically increasing or decreasing the circumferential speed of the carry-in side or carry-out side roller group,
The conveying mechanism can be driven by periodically increasing the circumferential speed of the unloading roller group than the conveying roller group, and a veneer support mechanism is provided opposite to the conveying mechanism configured in this manner. If the veneer is inserted into the device in a direction perpendicular to the fibers, small cracks will form in the veneer if there is no difference in circumferential speed between the loading roller group and the unloading roller group, or if the difference is small. Small cracks will form in the veneer only when a sufficient tensile force is not generated and the circumferential speed difference becomes large.

In other words, small cracks are formed in the veneer at a rate of once every - period, so if the period is changed appropriately by utilizing this characteristic, the device according to the first invention can be realized. In this case, the interval between small cracks can be changed more easily than when changing the distance between the axes of the loading roller group and the unloading roller group, and if desired, by making the cycle relatively long, it is possible to It is also possible to form small cracks with wide intervals, which was not possible with the previous device.

The embodiment illustrated in FIG. 6 is an example of a transmission mechanism that changes gears mechanically, but many other known transmission mechanisms including electrical transmission mechanisms are illustrated in FIGS. 1, 2, and 2. Figures 3 and 5
It is attached to a shaft that drives one of the plurality of narrow rollers constituting the carry-in side or the carry-out side roller group of the conveyance mechanism which has the same configuration as the conveyance mechanism of the embodiment illustrated in the figure except for the drive form. By doing so, it is possible to configure a device according to the second aspect of the present invention.

As is clear from the above, according to the apparatus according to the present invention, desired small cracks can be stably formed almost unaffected by the thickness and material of the veneer, and if necessary, small cracks can be formed. The interval between cracks can be easily changed, and since the roller group on the carry-in side always transports the part of the veneer where small cracks have not yet formed, stable transport can be achieved. The effect of the present invention on the softening treatment of veneers in plywood factories is extremely large.

[Brief explanation of the drawing]

The drawings are for explaining the present invention, and FIG. 1 is a side explanatory view for explaining the device according to the first invention of the present invention, and FIG. 2 is a plan view of FIG. 1, and FIG. 3 to 5 are explanatory side views of other embodiments of the device according to the first invention of the present invention, and FIG. 6 is a side view of a transmission mechanism used in this device (second invention of the present invention) It is an explanatory diagram. 1, Ia, 2, 2a, 10, 10a, IL 11a. 15, 19. 19a, 20. 20a, 2
1. , 21a. 22.22a, 26, 28... shaft, 3. 3a
, 4゜4a, 13, 13a, 17, 24, 24a・
...Narrow roller, 5,5at 6,5a...
...Arm, 7°7a, 8,8a...Spring, 9. 14.25... Single plate, 12, 12a,
16, 23, 23a, 27...Narrow ring-shaped roller, 18, 34, 34a...Main shaft, 29
...... Drive source, 30... Tyner 31.
...Chain, 32,33...Chain wheel.

Claims (1)

[Scope of Claims] 1. An axis of a group of rollers on the carry-in side that is formed from a plurality of narrow rollers arranged at appropriate intervals, and a shaft center of a group of rollers on the carry-in side that is formed from a plurality of narrow rollers arranged at appropriate intervals. In order to make the axes of the carry-out roller group extremely close to each other, the plurality of narrow rollers on both sides are arranged in an alternating manner, and the carry-in roller group and the carry-out roller group are respectively driven. In order to achieve this, one or more drive shafts are disposed at appropriate positions, and the unloading roller group is driven through the shafts at a circumferential speed that is continuously greater than the circumferential speed of the unloading roller group. , small cracks in the veneer veneer are created by installing an appropriate type of veneer support mechanism that supports the veneer veneer through the path of the veneer veneer in opposition to the conveyance mechanism that conveys the veneer veneer in a direction perpendicular to the fibers. A device that forms 2. The axis of the carry-in roller group consisting of a plurality of narrow rollers arranged at appropriate intervals, and the axis of the carry-out roller group consisting of a plurality of narrow rollers arranged at appropriate intervals. A plurality of narrow rollers on both sides are arranged in an alternating manner in order to bring the rollers very close to the axis, and a plurality of Drive shafts are arranged at appropriate positions, and an appropriate speed change mechanism is attached to one of the plurality of drive shafts, and the peripheral speed of the carry-in roller group is changed through the speed change mechanism and the shaft. The veneer veneer is supported through the path of the veneer veneer by a conveyance mechanism that conveys the veneer veneer in a direction orthogonal to the fibers, which is configured to drive the unloading roller group by increasing the peripheral speed periodically. A device for forming small cracks in a veneer veneer, which is made by arranging veneer support mechanisms of an appropriate form.