JPS5818206B2 - Veneer lace - Google Patents

Description

Detailed Description of the Invention The present invention relates to a veneer cutting method using a veneer lace and an improvement of the veneer lace.The present invention relates to a veneer cutting method and an improvement of the veneer lace.Its purpose is to reduce the cutting resistance during veneer cutting, the so-called cutting resistance, and the resistance applied to the chuck that grips the raw wood. , a cutting method for a new veneer race that significantly reduces the load and makes it possible to cut soft logs, etc. in the part where rotational force is transmitted to the log, that is, the part gripped by the chuck at the side end core, and its cutting method. The purpose of the present invention is to provide a device that improves the cutting surface of a veneer using a new veneer cutting method, and also aims to flatten the veneer by reducing the stiffness of the veneer at the same time as cutting. It is.

As shown in FIG. 2, the conventional veneer lace basically has a cutting tool 7, and a pressure parser 5 pushes the log 4 near the tip of the cutting tool 7.

This has the effect of preventing the occurrence of so-called tip cracks that grow beyond the tip of the cutter 7, which occurs when the cutter 7 enters the pressure par 5 and the cutting board 4, and obtains a veneer with a good cutting surface. This method has given the impression of veneer lace.

Incidentally, if the pressure par 5 is not used, the cut surface of the veneer 2 that is cut as illustrated in FIG. 1 will be extremely rough.

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, the quality of the plywood product, etc., and in reality cannot be considered normal.

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 some parts of the veneer lace that are gripped by the chuck are soft, and when cutting such raw wood with the conventional equipment described above, the pressure bar cannot be used sufficiently. , the cutting surface tends to become even rougher.

In some cases, the part of the wood that is gripped by the chuck is too soft to be cut with conventional equipment, so these logs have no choice but to 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 all of that cutting resistance is absorbed by the chuck of the raw wood. This allows you to concentrate on the part you grip.

Therefore, since the power is transmitted to the core of the side end of the raw wood and the inside of the raw wood is used as a power transmission medium, there are cases where some parts of the raw wood are soft and cannot be cut.

In addition, some devices have been tried that are equipped with a roller bar instead of a pressure bar, but the conventional roller bar is simply placed at a position to press the raw wood or the raw wood and the veneer immediately after cutting, as a substitute for the pressure bar. Although it is possible to reduce the resistance associated with the rotation of the roller bar, it tends to press the veneer against the cutter more than the pressure bar and increase frictional resistance, so it is not necessarily possible to achieve the desired effect. The current situation is that there is none.

The present invention solves these conventional problems and is proactive.

Specifically, in response to changes in the situation mainly related to raw wood, we will be able to effectively cut inferior quality raw wood using a new veneer cutting method.The details are as follows. be.

The method of cutting the veneer in the present invention is the conventional method.

Significantly different is that cutting is performed with tensile force applied to the veneer immediately after cutting.

The conventional method for cutting veneer is to cut under pressure at the cutting edge where the veneer and the raw wood separate 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, In this state, the veneer tends to break immediately after being cut, 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 effectively In this method, the veneers immediately after cutting are sequentially folded in a state where a tensile force is applied to the veneers immediately after cutting.

That is, the first aspect of the present invention is 1. For example, in a veneer lace in which raw wood is rotated and cut to continuously produce veneers as illustrated in FIG. A roller 10 whose outer peripheral surface has a relatively high coefficient of friction with the veneer is driven and rotated so as to hold down the veneer 9 and cut while applying a tensile force to the veneer 9 immediately after cutting. do.

The raw wood 11 is rotated using a chuck (not shown) and the above-mentioned row 210, but depending on the friction coefficient between the roller 100 circumferential surface and the veneer, all the power for the cutting resistance can be transmitted only by the roller 10. It is possible to do so.

According to the experiment, the surface of the cut veneer was good, as was the theory, and the power required for cutting was significantly reduced.

Next, the second invention of the present invention is, for example, as illustrated in FIG. A roller 13 covered with an elastic body such as rubber or synthetic rubber is provided approximately parallel to the blade 12, and a path for the veneer 140 immediately after cutting is formed between the blade 12 and the roller 13 covered with the elastic body.

At this time, the roller 13 coated with an elastic material such as natural rubber or synthetic rubber is in a position to simultaneously push the log 15 and the veneer 14 immediately after cutting.

Power is transmitted from the end of the log 15 by a chuck (not shown) as in the conventional manner.

When the log 15 rotates in such a device, the log 1
5 is a roller 1 coated with an elastic material such as natural rubber or synthetic rubber.
3, but if these relationships are arranged so that the roller 13 coated with the elastic body presses the veneer 14 that has just been cut somewhat more forcefully than the log 15, the roller 13 will drive the roller 3. The flow of the elastic body at the portion of the roller 13 that contacts the veneer 14 immediately after cutting tends to be faster than the flow at the portion of the roller 13 that contacts the raw wood 15, so that the veneer 14 immediately after cutting is caused by the outer periphery of the log 15. Trying to be sent out at a greater speed,
Therefore, a tensile force acts on the veneer 14 immediately after cutting.

Experiments have shown that, as mentioned earlier, if a tensile force is applied to the veneer immediately after cutting while cutting, cracks will stably grow from the tip of the cutter toward the side of the veneer at appropriate intervals. The cutting surface had a good finish.

Compared to conventional equipment, this equipment does not have the resistance caused by the pressure bar, cutting resistance is significantly reduced, and it is possible to cut poor quality logs. There is no risk of the board becoming jammed.

In addition, there is a part that presses the veneer with a flat surface immediately after the back crack is formed on the veneer, and the cut veneer has less warpage and is easier to handle than with conventional equipment.

Next, the third invention of the present invention will be explained with reference to FIG. 4 as follows.

That is, the roller 13 whose outer periphery is coated with a bullet body made of natural rubber, synthetic rubber, etc. is rotated freely in a position that is approximately parallel to the cutter 12 as shown in the figure and can at least hold down the veneer 14 immediately after cutting. A veneer 14 is placed between the cutter 12 and the roller 13.
The roller 13 is driven so that the circumferential speed of the outer circumferential portion of the roller 13 that presses the veneer 14 is slightly faster than the circumferential speed of the outer circumferential surface of the log 15.

In such an apparatus, the roller 13 to which a driving force is applied makes it possible to cut the veneer 14 immediately after cutting while applying a tensile force to the veneer 14.

In other words, by transmitting power to the veneer immediately after cutting to bear at least part of the cutting resistance, it becomes possible to cut the veneer while applying tensile force to the veneer immediately after cutting. .

Of course, as in the second embodiment of the invention, it is also possible to apply a tensile force to the veneer 14 immediately after cutting, by also using changes in the circumferential speed of the elastic body coated on the roller 13.

By driving the roller covered with the aforementioned elastic material, this device significantly reduces the power that should be transmitted by the chuck, and can even eliminate it if necessary. It is possible to cut

In addition, when power is transmitted to the raw wood at a constant speed by the roller 13, the cutting speed of the veneer to be cut becomes constant, no special speed adjustment control is required, and connection with subsequent processes is eliminated. It becomes extremely easy and can be automated.

The elastic material used in this device, such as natural rubber or synthetic rubber, can stably apply tensile force to the veneer immediately after cutting due to its elasticity, and generally has a high coefficient of friction with the veneer, making it effective.

Similar to the second invention of the thin tube, there is no clogging of waste veneer near the cutter, and the cut veneer has relatively little warp.

As is clear from the above, the veneer lace according to the second aspect of the present invention is provided with a roller coated with an elastic body at a position where it presses the veneer immediately after cutting somewhat more forcefully than the raw wood. The veneer lace according to the thirteenth invention includes a roller coated with an elastic body at least at a position to press the veneer immediately after cutting, and a veneer lace according to the thirteenth invention. By driving the rollers so that the circumferential speed at the position where the veneer is pressed is slightly faster than the circumferential speed of the outer circumferential surface of the log, the veneer is cut while applying tensile force. Compared to the conventional veneer lace, which simply has a roller bar at a position where it presses only the raw wood or the raw wood and the veneer immediately after cutting, the cut surface of the veneer is better. It is possible to achieve a significantly superior effect in terms of durability and reduction of log damage, etc., and the effect of implementing it in a plywood factory is extremely large.

[Brief explanation of drawings]

The drawings are for explaining the present invention, and FIGS. 1 and 2 are side cross-sectional explanatory views for explaining the conventional method and apparatus, and FIG. 3 is for explaining the method according to the present invention. FIG. 4 is a side sectional explanatory view for explaining the apparatus according to the present invention. 1.4,11,15... Log, 2,6,9゜1
4...-Single plate, 3,7,8,12...Knife, 5...Pressure bar, 10,13...
...Roller covered with elastic material.

Claims (1)

[Scope of Claims] 1. In veneer lace, in which veneers are sequentially manufactured by cutting raw wood with a blade while rotating, the coefficient of friction with the veneer is high and the running speed is slightly faster than the running speed of the outer circumferential surface of the raw wood. A roller having an outer circumferential surface that runs at a high speed is placed approximately parallel to the cutter and at a position where the outer circumferential surface that runs at a high speed presses the veneer immediately after cutting, and pulls it against the veneer immediately after cutting. A method for cutting veneer veneer in veneer lace, which is characterized by cutting while applying force. 2. In veneer lace, in which raw wood is cut with a cutting tool while rotating to produce veneers one by one, a roller whose outer periphery is covered with an elastic material such as natural rubber or synthetic rubber is placed approximately parallel to the cutting tool, and It is rotatably provided at a position that presses the veneer somewhat more forcefully immediately after cutting, and due to the difference in deformation of the elastic body due to the difference in the suppression state of the roller, local peripheral speed differences in the elastic body are created. This veneer lace is characterized by a structure in which a tensile force is applied to the veneer immediately after cutting. 3. In veneer lace, in which raw wood is cut with a cutting tool while rotating to produce veneers one by one, a roller whose outer periphery is coated with an elastic material such as natural rubber or synthetic rubber is placed approximately parallel to the cutting tool, and with a small The veneer immediately after cutting is rotatably provided at a position where it can be suppressed, and the roller is arranged so that the circumferential speed of the outer circumferential portion of the roller that presses the veneer is slightly faster than the circumferential speed of the outer circumferential surface of the log. A veneer lace characterized by being driven and configured to apply tensile force to the veneer immediately after cutting.