JPS6117248B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in veneer lace,
The purpose of this is to significantly reduce the cutting resistance during veneer cutting, the resistance and load applied to the chucks that grip the raw wood, and reduce, for example, the parts that transmit rotational force to the raw wood, that is, the chucks at the side end cores. Our goal is to provide a veneer lace that makes it possible to cut soft lumber etc. at the gripping part, and also to improve the cutting surface of the veneer, as well as to loosen the veneer's stiffness and flatten the veneer at the same time as cutting. This is what we aim to do.

As shown in FIG. 2, the conventional veneer lace basically has a cutting tool 7 against it, and a pressure bar 5 presses the log 4 near the tip of the cutting tool 7. This pressure bar 5 has the effect of preventing so-called tip cracking, which occurs when the cutting tool 7 enters the raw wood 4 and grows beyond the tip of the cutting tool 7, and obtains a veneer with a good cutting surface. This method has given veneer lace an impression. Incidentally, if the pressure bar 5 is not used, the cut surface of the cut veneer 2 will be extremely rough as illustrated in FIG. 1 is log, 3 is knife.

Here, the problems surrounding conventional veneer laces are as follows. There is still dissatisfaction with the finished state of the cut surface of the veneer cut by conventional veneer lace. The quality of the cut surface significantly affects the yield of raw wood, the amount of glue required to bond veneers together, and the quality of the plywood product.
It is not possible to make it normal based on the actual situation.

Furthermore, the actual situation tends to further deteriorate the roughness of the cut surface of the veneer. The main reason for this is the lack of raw wood, and the freedom to select raw wood for use in plywood as in the past has been eliminated. Inevitably, the quality of the raw wood deteriorates, and the part of the veneer lace that is gripped by the chuck is soft, so when cutting such raw wood with the conventional equipment described earlier, the pressure bar cannot be used to its full effect. This tends to further deteriorate the roughness of the cut surface.

In some cases, the part of the wood that is gripped by the chuck is too soft to be cut using conventional equipment, and these logs must be disposed of as waste.

As explained earlier, the conventional equipment used a pressure bar to improve the cutting surface of the veneer, but this method obviously increases the cutting resistance, and the cutting resistance is entirely due to the chuck of the raw wood. It's designed to concentrate on the part you're gripping. Therefore, since the power is transmitted to the core of the log and the inside of the log is used as the power transmission medium, there are cases where some parts of the log are soft and cannot be cut.

The present invention solves these conventional problems, proactively responds to changes in the situation mainly related to raw wood, and
The purpose is to enable effective cutting of poor quality logs, and the details are as follows.

The principle of cutting a veneer in the present invention is significantly different from conventional methods, in that the veneer is cut while applying a tensile force to the veneer immediately after cutting. The conventional method for cutting veneer is to cut under pressure at the parting point between the veneer and the raw wood at the cutting edge to prevent tip cracks that tend to grow ahead of the cutting edge. However, the present invention applies tensile force to the veneer immediately after cutting to actively form cracks on the veneer side near the tip of the cutter to prevent tip cracking. In other words, the formed veneer is folded when the cutter penetrates the log to some extent, preventing cracks that tend to grow before the cutter and cracks that tend to grow toward the log, resulting in a good cut surface. The purpose is to obtain a board. Of course, the force that tends to break the veneer immediately after cutting is generated simply by penetrating the veneer with a knife, but normally, the frictional force from contact with the knife is applied as a resistance force to the veneer immediately after cutting, and this adds resistance. In this state, the veneer tends to break immediately after cutting, and in this case, tip cracking cannot be prevented. The present invention applies a tensile force to the veneer immediately after cutting in the direction of movement of the veneer, canceling out the frictional force caused by the cutter to reduce the frictional force on the veneer immediately after cutting, or applying a tensile force greater than the frictional force to substantially reduce the frictional force against the veneer immediately after cutting. The veneers immediately after being cut are successively folded in a state in which a tensile force is applied to the veneers immediately after cutting.

Next, an embodiment using the above-described novel veneer cutting principle will be described.

For example, in a veneer lace in which raw wood is rotated and cut to continuously produce veneers as illustrated in FIG. 3, the veneer side of the cutter 8 is coated with an elastic material such as natural rubber or synthetic rubber. is provided substantially parallel to the cutter 8 to form a path for the veneer 11 immediately after cutting between the cutter 8 and the roller 10 covered with the elastic body. At this time, the roller 10 coated with an elastic material such as natural rubber or synthetic rubber is in a position to simultaneously press the raw wood 12 and the veneer 11 immediately after cutting. Power is conventionally transmitted by a chuck (not shown) at the end of the log 12.

When the log 12 rotates in such a device, the log 12 drives a roller 10 coated with an elastic material such as natural rubber or synthetic rubber. At this time, for example, the roller 10 covered with the elastic body
If these relationships are arranged so that the veneer 11 immediately after cutting is pushed somewhat more forcefully, the flow of the elastic body at the portion of the roller 10 in contact with the veneer 11 immediately after cutting will be as follows. The flow tends to be faster than the flow at the part of the roller 10 that is in contact with the log 12, and therefore the veneer 11 immediately after cutting tends to be sent out at a higher speed than the outer circumference of the log 12, and therefore the veneer 11 immediately after cutting A tensile force acts on 11. Experiments have shown that if the veneer is cut while applying a tensile force immediately after cutting, cracks will grow stably at appropriate intervals from near the tip of the blade toward the side of the veneer, resulting in a good finish on the cut surface. It became a state. Compared to conventional devices, this device does not have the resistance of the pressure bar, cutting resistance is significantly reduced, and it is possible to cut poor quality logs. There is no risk of getting stuck.

Next, the principle of flattening a veneer will be explained with reference to FIG. The cutter 8 is provided with a convex portion 9 on its veneer-side surface, which is approximately parallel to the base of the cutter 8, and the roller 10 covered with the elastic material presses the convex portion 9 on the veneer-side surface of the cutter 8. Veneer 11 in position and immediately after cutting
The passageway is curved. The shape of the convex portion on the surface of the veneer near the tip of the blade 8 should not be particularly limited, and it should be It is sufficient that the point at which the veneer 11 is bent toward the raw wood is located between the cutter 8 and the roller 10 covered with the elastic body. In this way, the veneer cut by this device is stiff, has very little warpage, and is extremely easy to handle in subsequent processes.

Next, the veneer lace according to the second aspect of the present invention will be explained with reference to FIG. 3 as follows. As is clear from the drawing, the single plate side of the blade 8 is coated with an elastic material such as natural rubber or synthetic rubber.
0 is provided substantially parallel to the cutter 8 to form a path for the veneer 11 immediately after cutting between the cutter 8 and the roller 10, and further drives the roller 10 covered with the elastic body.

In such an apparatus, the roller 10 to which a driving force is applied makes it possible to cut the veneer 11 immediately after cutting while applying a tensile force to the veneer 11. In other words, by transmitting power to the veneer immediately after cutting to bear some or all of the cutting resistance, it is possible to cut the veneer while applying tensile force to the veneer immediately after cutting. be. Of course the first
As in the second invention, it is also possible to apply a tensile force to the veneer 11 immediately after cutting by using a change in the circumferential speed of the elastic body coated on the roller 10. By using this device to drive the roller covered with the aforementioned elastic material, the power to be transmitted by the chuck can be significantly reduced, or even eliminated if necessary, and the core is extremely soft. It is possible to cut raw wood. In addition, when the power is transmitted to the raw wood at a constant speed by the roller 10, the cutting speed of the veneer to be cut becomes constant, no special speed adjustment control is required, and there is no need to control the speed adjustment. Connection becomes extremely easy and automation becomes possible.

The elastic materials used in this device, such as natural rubber and synthetic rubber, can stably apply tensile force to the veneer immediately after cutting due to their elasticity, and generally have a high coefficient of friction with the veneer, making it effective. be. In addition, there was no clogging of waste veneer near the cutter, and surface cracking occurred due to the curvature of the passage due to the presence of the convex portion 9.
The fact that the single plate 11 is flattened is also the same as described in the first invention.

[Brief explanation of the drawing]

The drawings are for explaining the present invention, and FIGS. 1 and 2 are side cross-sectional views for explaining the conventional veneer lace, and FIG. 3 is for explaining the veneer lace according to the present invention. FIG. 1, 4, 12... Log, 2, 6, 11... Single plate, 3, 7, 8... Cutlery, 5... Pressure bar, 9... Convex part, 10... Elasticity of natural rubber, synthetic rubber, etc. Roller covered body.

Claims (1)

[Claims] 1. Cutting the raw wood with a knife while rotating it,
In the veneer lace for manufacturing single slopes in sequence, a convex portion approximately parallel to the cutting edge is provided at a position immediately behind the cutting edge on the surface of the veneer side of the cutter, and the outer periphery is coated with natural rubber.
A roller coated with an elastic material such as synthetic rubber is placed approximately parallel to the blade, and presses the veneer immediately after cutting, which is located directly behind the cutting edge or above the convex portion of the blade, rather than the raw wood, with some force. A veneer lace characterized by its ability to rotate freely. 2 Cut the raw wood with a knife while rotating it,
In the veneer lace for manufacturing veneers in sequence, a convex portion approximately parallel to the cutting edge is provided on the veneer side surface of the cutter at a position immediately behind the cutting edge, and a convex portion approximately parallel to the cutting edge is provided, and the outer periphery is coated with natural rubber.
A roller coated with an elastic material such as synthetic rubber is provided at a position substantially parallel to the cutter and at a position where it can press at least the veneer immediately after cutting that is on the convex portion of the cutter, and further the roller is moved as appropriate. A veneer lace characterized by being configured to be driven at speed.