JPS6125523B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improved veneer lace.

In conventional veneer lace, the cutting part consists of a cutter and a fixed bar, and in some cases the fixed bar is replaced with a roller bar, but in any case, the power is exclusively transmitted to the cutting part via the spindle that holds the raw wood. The problems with such conventional veneer lace are as follows.

The first thing to point out is that it is unsuitable for cutting hard logs, soft logs in the center, and logs with cracks, which may damage the chuck and make power supply impossible, or destroy the log and make cutting impossible. This is a point where it becomes This is due to the high cutting resistance and the fact that the power is supplied to it through the inside of the log over a long distance from the center of both ends of the log to the cutting part.
Material yield is significantly reduced. The second problem is the occurrence of troubles due to blade clogging, which often occurs with logs that are cracked or rotten, reducing the operating rate of the equipment and the material yield.

Such problems are certainly related to the quality of the raw wood, and therefore, in order to exclude raw wood that is difficult to cut with conventional veneer lace, raw materials are selectively received under the names of materials suitable for plywood and materials unsuitable for plywood. Ta. However, the raw wood situation has changed dramatically, and we are now forced to accept the inclusion of considerably low-quality raw wood. In an era when logs could be easily sorted into suitable and unsuitable materials, veneer lace gave the impression of being a nearly complete device, and even today, even if some unsuitable materials are mixed in, it remains an economical waste. Due to quick judgment, unsuitable materials are diverted to other uses such as lumber, so it seems that there are not many problems with veneer lace.

However, the objective reality is that this is a huge loss, and the above-mentioned problems cannot but be pointed out as fundamental serious shortcomings of the conventional veneer lace.
Thirdly, there are other problems that will be clarified as each effect of the present invention is described, and will be pointed out through the description of the present invention.

Veneer lace is the only important part of the plywood manufacturing process that transforms raw wood into something else: veneer veneer. Depending on the type of veneer lace, the material yield changes significantly, which determines which logs are suitable and which logs are unsuitable, which greatly affects the flow of subsequent processes and the quality of the product.

The present invention was developed based on this recognition, and it solves the conventional problems and makes it possible to smoothly cut hard logs that were difficult to cut with conventional veneer laces, logs that are soft in the center, and logs that have cracks. The purpose of this project is to predict the future need for the use of miscellaneous trees and provide veneer lace that can be adapted to that need.The details are as follows.

The basis of the veneer lace according to the present invention is a structure in which the power for cutting the log is actively supplied from the outer periphery of the log, and moreover, it is supplied from the cutting edge of the cutter to the outer periphery of the log just before cutting. The medium of power supply is
It is a roll with a large number of protrusions on its outer periphery, also known as a drive roll, and has a somewhat larger diameter than the conventional roller bar, and its mounting position is as follows:
It is somewhat better than the cutting edge of a knife, and the drive roll is driven by an electric motor or the like to actively supply power to the raw wood.

Incidentally, the protrusions of the drive roll do not need to be continuous in the axial direction, and in fact, the ability of a drive roll with protrusions on the outer periphery to drive logs is higher than expected, and as a result, the outer periphery is The protrusions could be thinned out considerably in the axial direction, which would have been a disadvantage over conventional roller bars. The discovery that the radial pressing force of the driving roll against the raw wood can be significantly reduced served as a major motivation for the development of the present invention, and served as the basis for completing the veneer lace according to the present invention.

The effect of supplying power to the outer periphery of the log just before cutting is that the path for power transmission through the log is extremely short, and the external force applied to parts of the log other than the cutting part is significantly reduced. Since the part and the power supply part are on almost the same circumference of the log, there is little difference in the material between the two parts and between them.
Further, a large moment of force is not generated in the power supply unit as in the conventional case, and therefore, the disabling of driving the log and the destruction of the log can be greatly improved. For example, experiments have shown that even when a crack 8 that runs through the entire length of the log 1 is intentionally formed, as illustrated in Figure 1, it is possible to cut the log as smoothly as when there are no cracks. did it. In FIG. 1, 2 is a cutter, and 3 is a drive roll having a large number of protrusions 4 on its outer periphery.

In addition, the drive roll in the present invention needs to be somewhat larger in diameter than the conventional roller bar due to power supply, and since it has an actively driven structure, there is no space between the cutter and the drive roll. The flow through the outlet of the formed veneer veneer is significantly smoothed, and therefore there is almost no possibility that small pieces will become clogged.For example, in the case illustrated in Fig. There was a very high possibility that the blade 1a would peel off and become clogged, but with the veneer lace according to the present invention, power is reliably supplied to the small piece 1a, and there is almost no possibility of the blade becoming jammed. The range of applicable logs that can be smoothly made into veneers by veneer lace is expanded at once, and it is possible to improve the material yield, the effective use of resources, and the operating rate of the equipment.

Further, as a specific example in which the drive roll in the veneer lace of the present invention is provided above the cutting edge of the cutter, the protrusion of the drive roll is connected to the raw wood immediately before cutting on the upper side of the cutting edge of the cutter, and If the cutter is provided at a position where it can pierce both the veneer veneer immediately after cutting on the lower side than the cutting edge, it will be compatible with the cut being made from the surface of the veneer veneer by the protrusion of the drive roll. In addition, by driving the drive roll, the veneer veneer immediately after cutting is stretched somewhat in the direction of discharge, and the veneer veneer is stretched at a regulated rate, resulting in very good curling. A veneer veneer is obtained. This effect was discovered during the course of the experiment, and the experimental results clarified that there was a significant difference between when the drive roll was driven and when it was driven, but in any case, The ability to obtain a veneer veneer with less curl in veneer lace is very advantageous for streamlining the plywood manufacturing process.

Furthermore, with the veneer lace according to the present invention, it is easy to keep the cutting speed, that is, the discharge speed of the veneer veneer constant, by driving the drive roll, and therefore it is extremely easy to synchronize with the subsequent process. The mechanism of the lace itself can also be simplified.

In addition, in order to increase the effectiveness of driving the raw wood of the drive roll, if the diameter of the drive roll is made somewhat larger, for example, even if it is placed in the same position as a conventional roller bar,
It tends to be difficult to obtain the same effect as a roller bar, and this role is played by a large number of protrusions on the outer periphery of the drive roll.

For example, as illustrated in FIG.
A cut is formed from the outside of the log 1 at a position immediately before cutting by the protrusion 4, and the log 1 is in a softened state waiting for the cutter 2 to enter. Moreover, since power is supplied to the drive roll 3, the tip cracks tend to grow in the direction of the cut marks made by the projections 4 of the drive roll 3. Therefore, a veneer veneer with a good cutting surface can be obtained due to the tendency of the tip cracks to be reduced and the tip cracks to be directed outward from the trajectory of the cutting tool 2.

According to experiments, it has been found that the finer the pitch of the protrusions 4 is to a certain extent, the better the cutting surface is.As illustrated in FIG. When tilted in the direction of rotation, the cutter 2 enters in a more flexible state, and the cutting surface of the veneer veneer 7 has fewer burrs and the like, resulting in a better cutting surface. .

However, according to the experimental results at the current stage, there is still room for further research regarding the overall quality of the veneer veneer obtained by the veneer lace according to the present invention, but in any case, there is still room for further research. The effect of cutting raw wood, which is said to be suitable wood, and turning it into veneer veneer is tremendous, and the economic effect is extremely significant.

Next, the veneer lace according to the present invention and its modified examples will be explained as follows, together with some specific structures. Parts that can be easily implemented will be omitted as much as possible to avoid complication.

As illustrated in FIG. 1, the veneer lace of the first embodiment of the present invention has a drive roll 3 having a large number of protrusions 4 on the outer circumferential portion, and a cutter 2.
Place the rotation axis of the drive roll 3 at a position slightly higher than the cutting edge of the blade 1, at a position where the lead 6 is taken from the line 5 connecting the rotation axis of the log 1 and the cutting edge of the cutter 2, and In addition to forming a passage for the veneer veneer 7 immediately after cutting between them, as illustrated in FIG. Or a log rotation mechanism 9 such as a spindle drive mechanism including an electric or mechanical mechanism 11 that limits the power capacity to a certain level or less, and further faithfully relates to the rotation of the log 1 (spindle 28) as usual. , cutlery 2
a feeding mechanism 27 that moves the log in the centripetal direction of the log 1;
Specifically, the log rotation mechanism is a mechanism including a torque limiter, a slippable part, an overrunning device, an automatic cutoff mechanism for a power source, etc. In the figure, 10 and 13 are electric motors.

According to the device with this structure, since the log rotation mechanism is provided, the tool rest can be brought close to the log while the log is idling at the time of starting cutting, and the drive by the drive roll can be started smoothly. can be done. Furthermore, since the log rotation mechanism limits the transmission torque or power capacity to a certain level or less, even if the power supplied from the log rotation mechanism is transmitted to the logs via the spindle and chuck, the transmission torque or power capacity will be limited. Since it is limited, there is little risk of destroying the log. Of course, by providing a feeding mechanism that faithfully relates to the rotation of the raw wood, even after the driving roll has started, the
It is possible to cut veneer veneers with uniform thickness.

Note that the protrusions of the drive roll do not necessarily have to be continuous in the axial direction as described above, and can be thinned out in the axial direction, for example, as illustrated in FIG. In the example shown in FIG. 4, the protrusions 4 are thinned out by forming a groove-like space 31. In this case, the portion including the protrusions 4 becomes disc-shaped and can be replaced by the shaft 29. The drive roll and protrusion can be easily processed and assembled. In the figure, 18 is a bearing, and 19 is a chain wheel.

Further, in order to reduce the pressing force while reducing the cutting damage to the raw wood, it is preferable that the protrusions are approximately parallel to the axial direction, as illustrated in FIG. 4, but they are not limited to such a form. , there is no problem in practical use as long as the shape can be press-fitted into the outer circumference of the log.

Furthermore, the log rotation mechanism is not limited to a log rotation mechanism consisting of a spindle drive mechanism, etc.
For example, as illustrated in FIG. 6, a log rotation mechanism 15 configured to transmit the driving force of the electric motor 17 to the outer circumferential surface of the log 1 via a rotary roll 16 or the like to rotate the log may be used. .

Furthermore, the log contact members such as the rotating rolls of the log rotation mechanism 15 having the above-mentioned structure can also serve as a function of preventing the log from deflecting, but it is important to mention that the method and position of power supply for cutting the logs are different. ,
Because it is significantly different from conventional veneer lace,
The preferred location for attaching the member that serves to prevent warping of the log is also significantly different from conventional veneer lace.

Furthermore, if the log rotation mechanism includes, for example, a mechanical or electrical torque limiter or a slippable part, it is possible to reliably slip the log under a load below a certain level, and power can be transferred from the outer circumferential surface of the log. In the case of a log rotation mechanism configured to supply raw logs, the contact portion between the log contacting member such as a rotating roll and the outer circumferential surface of the log can be a slippable portion. In addition, if the log rotation mechanism is a log rotation mechanism that includes an overrunning device, it will work effectively only when the circumferential speed of the log by the drive roll is higher than the idle rotation circumferential speed of the log by the log rotation mechanism. The diverted power is used only for idling the log, and cutting of the log is performed using the power supplied from the drive roll. On the other hand, in the case where the log rotation mechanism includes an automatic cut-off mechanism of the power source that automatically cuts off the drive of the log rotation mechanism when the load exceeds a certain level or when the drive roll starts driving the logs. It is possible and effective to use a torque limiter, an overrunning device, etc. in combination.

In addition, regardless of the log rotation mechanism having any of the above configurations, the power source capacity does not necessarily need to be limited to the power source capacity of the drive roll or less.
Depending on the quality of the log, even if the power capacity supplied from the log rotation mechanism is greater than the power capacity supplied from the drive roll, there is no problem as long as the power capacity is less than the size that cannot be cut by itself. It would be even more effective to use a log rotation mechanism that also has an adjustment mechanism that can arbitrarily set the size of the power capacity.

Furthermore, conventional log drive mechanisms include a veneer race equipped with a friction plate clutch for driving and stopping, and its structure tends to be somewhat similar to the structure equipped with the torque limiter. The purpose and effect are completely different, and the reason is that
This purpose is to clarify that the original effect can only be produced by a combination of a drive roll having protrusions on the outer periphery and a drive mechanism thereof.

Next, the veneer lace of the second embodiment of the first invention of the present invention is based on the configuration of the veneer lace of the first embodiment, and further increases the idling circumferential speed or drive circumferential speed of the log by the log rotation mechanism. By appropriately setting the circumferential speed of logs by the driving rolls, synchronization is facilitated and power is utilized effectively.For example, as illustrated in Fig. A driving roll 3 having a diameter of 4 is provided to form a passage for the veneer veneer 7 immediately after cutting between the blade 2 and the driving roll 3, and as illustrated in FIG. The drive mechanism 12 of the drive roll 3 supplies the
The transmission torque further includes an electric mechanism or mechanical mechanism 11 that limits the power capacity to a constant value, and the idling circumferential speed or drive circumferential speed of the log 1 is set to be lower than the circumferential speed of the log by the drive roll 3, which is normal. The structure is equipped with a log rotation mechanism 9 such as a spindle drive mechanism that is designed to maintain a large rotation angle, and the control equipment for controlling the log rotation mechanism in this manner is, for example, a control device that is abundantly available as a known technology. Using an electrical tuning mechanism or other electrical control mechanism using a DC motor or a transmission, it is possible to easily create a mechanical tuning mechanism or other mechanical control mechanism that changes speed in inverse proportion to the distance between the log and the turret. It can be used.

In practice, it is extremely difficult to achieve strict synchronization between the drive mechanism of the drive roll and the log rotation mechanism, which have different drive forms and load forms, at the start of cutting the log or during the cutting process. According to the structure, the idling circumferential speed or driving circumferential speed of the log can be maintained higher than the circumferential speed of the log by the drive roll, so that after the drive roll starts driving the log, the log rotation mechanism is Although it has the ability to increase the circumferential speed to a high circumferential speed, the circumferential speed of the log during cutting basically follows the circumferential speed of the drive roll.
Therefore, even without providing a special precision tuning mechanism, it is possible to easily synchronize the drive mechanism of the drive roll and the log rotation mechanism, and the power supply from the log rotation mechanism is used to drive the logs by the drive roll. If the power supply is set to continue even after the start of cutting, most of the power supplied from the log rotation mechanism during cutting will be used to assist log cutting and feed power, excluding losses due to slips. This is effective.

In addition, in the case of the above structure, even if the power capacity supplied from the log rotation mechanism is larger than the power capacity supplied from the drive roll, there is no problem as long as the power capacity is less than the size that cannot be cut by itself.
It would be even more effective if the log rotation mechanism also had an adjustment mechanism that could arbitrarily set the size of the power capacity, and as illustrated in Fig. 6, it would be even more effective to supply power from the outer circumference of the log. In the case of a log rotation mechanism, it is extremely easy to keep the circumferential speed of the log constant regardless of changes in the outer diameter of the log, and therefore the idling circumferential speed or driving circumferential speed of the log is lower than the circumferential speed of the log due to the drive roll. However, in any case, this structure is not suitable for the log rotation mechanism including the overrunning device, and the circumference between the drive roll and the log rotation mechanism is not appropriate. The speed difference does not need to be too large.

On the other hand, the veneer lace of the first embodiment of the second invention of the present invention is based on the structure of the veneer lace of the first embodiment of the first invention, and further includes a drive roll or a drive mechanism thereof. By providing an overrunning device, it is possible to prevent conflicts caused by differences in circumferential speed caused by the inertial energy of logs. For example, as illustrated in FIG. In addition to forming a passage for the veneer veneer 7 immediately after cutting between the blade 2 and the driving roll 3, as illustrated in FIG. Drive roll 3 to feed the part
The drive mechanism 12 of the drive roll 3 is further provided with a log rotation mechanism 9 such as a spindle drive mechanism including an electric mechanism or mechanical mechanism 11 that limits the transmission torque or power capacity to below a certain level, and a drive mechanism 12 of the drive roll 3.
The structure is equipped with an overrunning device 14 at the top.

At the beginning of cutting raw wood, it is difficult to accurately match the idling circumferential speed of the raw wood and the circumferential speed of the drive roll, and even if the log rotation mechanism is equipped with a torque limiter, etc., the log or other Since it is not possible to eliminate the inertial energy of the members all at once, the idling speed of the log may be increased faster than the set value, and conflicts may occur between the log and the drive mechanism of the drive roll due to the difference in circumferential speed. However, according to the above structure, an overrunning device is installed in the drive mechanism of the drive roll. By providing this, the speed of the drive roll can be easily increased, thereby preventing a fight phenomenon due to a difference in circumferential speed caused by inertial energy of the raw wood, etc., and is effective because the above-mentioned inconvenience can be avoided.

The overrunning device is preferably attached at a position as close as possible to the protrusion of the drive roll. For example, the drive roll has a structure consisting of a shaft and an outer circumference including the protrusion, and the overrunning device is attached at a position as close as possible to the protrusion of the drive roll. It is preferable to interpose an overrunning device between the overrunning device and the overrunning device because the inertia after the overrunning device is minimized and the fighting phenomenon caused by the inertia after the overrunning device can be reduced.

Furthermore, the veneer lace of the second embodiment of the second invention of the present invention has the structure of the veneer lace of the first embodiment of the second invention and the second embodiment of the first invention. For example, as illustrated in FIG. 1, the blade 2 and the drive roll are equipped with a drive roll 3 having a large number of protrusions 4 on the outer periphery. In order to form a path for the veneer veneer 7 immediately after cutting between the sections 3 and 3, and to supply power to the outer peripheral portion of the log 1 immediately before cutting, as illustrated in FIG. , and further includes an electrical mechanism or mechanical mechanism 11 that limits the transmission torque or power capacity to a certain level or less, and sets the idling circumferential speed or driving circumferential speed of the log 1 to a value that is normally lower than the log circumferential speed by the drive roll 3. It is equipped with a log rotation mechanism 9 such as a spindle drive mechanism that is designed to maintain a large rotational speed, and an overrunning device 1 is provided on the drive mechanism 12 of the drive roll 3.
It is a structure with 4.

According to the above structure, as with the veneer lace of the second embodiment of the first invention, as a result, the drive mechanism of the drive roll and the log rotation mechanism can be easily connected without special provision of a precise synchronization mechanism. If synchronization can be easily achieved and the power supply from the log rotation mechanism is set to continue even after the drive roll starts driving the log, the power supply from the log rotation mechanism during cutting will be , most of it will be used to assist in cutting the raw wood and for feeding power, which is effective, and similar to the veneer lace of the first embodiment in the second invention, it is caused by the inertial energy of the raw wood, etc. It is effective in preventing fights caused by differences in circumferential speed, and if necessary, the difference in circumferential speed between the drive roll and the log rotation mechanism can be consciously increased to increase the power supply by the drive roll. It is also possible to actively utilize the inertial energy of the raw wood for cutting in the early stages of cutting, where there is a tendency to lack the inertial energy of the raw wood. This is effective because smooth cutting can be performed. Of course, similar to the second embodiment of the first invention and the veneer lace of the first embodiment of the second invention, the basics of the veneer lace of the first embodiment of the first invention are as follows. The effects associated with the structural configuration are not diminished in the slightest.

The above are some specific structures of the veneer lace and modifications thereof according to the present invention,
The structures of the drive roll and log rotation mechanism in the veneer lace of the second embodiment of the first invention, the first embodiment and the second embodiment of the second invention are as follows:
As described in the explanation of the veneer lace of the first embodiment in the first invention of the present invention, it is possible to make appropriate changes, but in any case, according to the veneer lace of the present invention, , is highly effective in solving the problem of wood destruction and blade clogging during cutting, and enables smooth cutting of wood, etc., which was conventionally considered unsuitable for plywood, as well as for use with miscellaneous trees or small-diameter trees that are expected to be used in the future. The effect of enabling effective cutting, such as the

[Brief explanation of the drawing]

The drawings are for explaining the veneer lace according to the present invention, and FIGS. 1 and 2 are side cross-sectional views of the cutting part, and FIGS. 3, 5, and 6 are explanatory views of the drive system. , FIG. 4 is a front explanatory view of the drive roll. 1...Log, 2...Knife, 3...Drive roll,
4... Protrusion, 9, 15... Log rotation mechanism, 12
. . . Drive mechanism for drive roll, 27 . . . Feeding mechanism.

Claims (1)

[Claims] 1. A drive roll having a large number of protrusions on the outer periphery is provided at a position slightly higher than the cutting edge of a cutter, and a plywood veneer immediately after cutting is placed between the cutter and the drive roll. In order to form a passage and supply power to the outer periphery of the raw wood immediately before cutting, the drive roll is equipped with a drive mechanism, and further includes an electric mechanism or a mechanical mechanism that limits the transmission torque or transmission power capacity to a certain level or less. A veneer lace featuring a log rotation mechanism. 2. A drive roll having a large number of protrusions on the outer periphery is provided at a position slightly higher than the cutting edge of the cutter, and a path is formed between the cutter and the drive roll for the veneer veneer immediately after cutting, In order to supply power to the outer circumference of the log immediately before cutting, the drive roll is equipped with a drive mechanism, and further includes a log rotation mechanism including an electric mechanism or a mechanical mechanism that limits the transmitted torque or the transmitted power capacity to a certain level or less, A veneer lace further comprising an overrunning device in the drive roll or its drive mechanism.