JPS6125525B2 - - 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 supply for it is carried out using the long distance inside the log from the center of both ends of the log to the cutting part as a medium, which significantly reduces the material yield. The second type of trouble occurs due to blade clogging, which often occurs in cracked or rotten logs, 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 wood, veneer lace gave the impression of a nearly perfected device. Even today, even if some unsuitable materials are mixed in, the unsuitable materials are used for other uses such as lumber, based on quick empirical judgment, 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.
I would also like to mention that some attempts have been made to supply power to the roller bar and rotate it.
In order to achieve the purpose of pressure shear bars, the ones that have been put into practical use are single-stranded over the entire length of the log and have an extremely thin diameter, so it is impossible to support them with rolling bearings, so they are supported by sliding bearings. Support is unavoidable, and most of the power that can be supplied according to the diameter is consumed by frictional resistance with the sliding bearing. Almost nothing is being done to supply it. 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 a different product, 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, logs with soft centers, logs with cracks, etc. that were difficult to cut with conventional veneer laces. The purpose of this project is to provide a veneer lace driven around the outer circumference of raw wood that can predict the future need for the use of miscellaneous wood and meet it.The details are as follows.

The basis of the veneer lace of 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 is a suitably shaped log drive roll, which has a somewhat larger diameter than the roller bar of the conventional concept, and whose mounting position is slightly higher than the cutting edge of the cutter, and is driven by an electric motor, etc. This takes the form of actively supplying power to logs.

In addition, the portion of the outer periphery of the log drive roll that contacts the log does not necessarily have to be continuous in the axial direction, and may be appropriately thinned out in the axial direction, which causes more drawbacks than conventional roller bars. It was supposed to be hot. It is possible to significantly reduce the pressure force applied to the log in the radial direction.

The effect of supplying power to the outer circumference of the log just before cutting is that the power transmission path through the log is extremely short, and since the cutting section and the power supply section are on almost the same circumference of the log, There is little difference in the materials between the two parts and between them, and the power supply does not generate a large moment of force as in the past, so the disabling of log drive and the destruction of logs can be significantly improved. That's true. For example, according to experiments, even when a crack 8 is intentionally formed in a log 1 that runs through its entire length, as illustrated in FIG.
It was possible to cut smoothly in the same way as when there were no cracks. In Figure 1, 2 is a knife,
3 is a drive roll having a large number of protrusions 4 on its outer periphery.

In addition, the log 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 active drive structure, it is difficult to connect the cutter and the log drive roll. The flow through the outlet of the veneer veneer formed between them is significantly smoothed, so there is almost no risk of small pieces clogging. However, with the veneer lace of the present invention, power is reliably supplied to the small pieces 1a, so
The probability of blade jamming is significantly lower than before.

Therefore, 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.

Furthermore, in the veneer lace of the present invention, the log driving peripheral speed of the log driving roll is normally higher than the idling peripheral speed or driving peripheral speed by a log rotation mechanism provided separately from the log driving roll to idle or drive the log. By setting the speed to a high value, smooth cutting and efficient use of power are achieved. It is also possible to make it constant, which facilitates synchronization with subsequent processes and also simplifies the mechanism of the veneer lace itself.

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 using the veneer lace of the present invention, but in any case, it has been determined that The effect of cutting even the so-called raw wood into veneer veneer is tremendous, and the economic effect is extremely significant.

Next, the veneer lace of the present invention will be described in detail along with preferred embodiments, but the drawings and explanations will only show relatively important parts, and the parts that can be easily implemented using known techniques will be explained in detail. omitted as much as possible to avoid confusion.

That is, in a preferred embodiment of the veneer lace of the present invention, as illustrated in FIG. Place the rotation axis of the drive roll 3 at a position slightly higher than the cutting edge, 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 between the cutter 2 and the drive roll 3. a drive mechanism 12 for a drive roll 3 for forming a passage for the veneer veneer 7 immediately after cutting, and for supplying power to the outer periphery of the log 1 just before cutting, as illustrated in FIG. Separately from 3, a log rotation mechanism 9 such as a spindle drive mechanism for idling or driving the log 1 is provided. It is normally set higher than the circumferential speed, and is equipped with a feeding mechanism 27 that moves the cutter 2 in the centripetal direction of the log 1 in faithful relation to the rotation of the log 1 (spindle 28) as usual. 10 and 13 in the figure 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 start of cutting, and the power supply by the log drive roll can be smoothly supplied. can be started. Of course, since it is equipped with a feeding mechanism that faithfully relates to the rotation of the log, even after the log drive roll starts supplying power,
It is possible to cut veneer veneers with uniform thickness.

Furthermore, it is difficult to accurately match the idling peripheral speed of the log and the circumferential speed of the log driving roll, and if the idling peripheral speed of the log is higher than the log driving peripheral speed of the log driving roll, in the early stage of cutting, , when transitioning from high speed to low speed, the drive does not transition smoothly, and cutting resistance also occurs almost at the same time, resulting in sudden braking.
Although there is a risk that the portion supported by the log rotation mechanism 8 may be damaged and spin idly, or that it may adversely affect the cutting surface of the veneer veneer, etc., according to the above configuration, the idling circumferential speed of the log rotation mechanism Since the log drive circumferential speed of the log drive roll is set higher than that of the log drive roll, the drive transition from low speed to high speed is smooth at the beginning of cutting, and at least there is no sudden change in the initial stage of cutting. Since the driving force of the raw wood drive roll effectively acts on the cutting resistance generated during cutting, there is little risk of the above-mentioned problems occurring, and overall good cutting can be performed.

The cutting speed after cutting starts is determined by the ratio of the driving force by the log drive roll and the drive force by the log rotation mechanism to the cutting resistance. For example, if the driving force by the log drive roll is , if the driving force of the log rotation mechanism is sufficient to meet the cutting resistance, the peripheral speed of the drive roll driven by the log rotation mechanism will be approximately the same as the peripheral speed of the drive roll driven by the log rotation mechanism. Although cutting is performed at different speeds, it is preferable that the difference in circumferential speed be small in any case.

It is also preferable to make the driving force of the log drive roll relatively large, since this will further reduce the degree of damage to the chuck of the log. However, even if the drive force of the log drive roll is significantly less than the drive force of the log rotation mechanism Even so, since the drive roll circumferential speed of the log drive roll is set higher than the idling circumferential speed of the log rotation mechanism, the driving force from the log drive roll can of course be used to assist in cutting the log. This is effective because it effectively prevents the blade from clogging.

In addition, 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. 3, a log rotation mechanism 15 configured to transmit the driving force of an 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 also be used. The log contact member such as the rotary roll of the log rotation mechanism with the above-mentioned structure can also serve the purpose of preventing the log from deflecting, but it should be noted that the method and position of power supply for cutting the log are different from those of the conventional method. Since this is different from the conventional veneer lace, the preferred position for attaching the member that prevents the log from warping is also different from that of the conventional veneer lace.

In addition, if the driving force of the log drive roll is larger than the cutting resistance, the log rotation mechanism 9 should be equipped with an overrunning device 11, or a load above a certain level or The system is equipped with an automatic cut-off mechanism for the power source that automatically cuts off the drive of the power source of the log rotation mechanism when the log drive roll starts driving the log, so that the log rotation mechanism does not interfere with cutting during cutting. It is convenient to do so, and there is no problem even if the log rotation mechanism is equipped with a slipperable part such as a torque limiter.In the case of a log rotation mechanism that supplies power from the outer circumference of the log as described above, the rotation roll 16 etc. The log contacting member, the outer periphery of the log, and the contact portion can be a slippable portion.

Furthermore, depending on the shape of the log, etc., the idling circumferential speed may be increased more than the set value due to the inertia energy of the log. For example, as illustrated in FIG. It is also possible to provide an overrunning device 14 to the drive roll 3 so as to easily increase the speed of the drive roll 3 to prevent a fight phenomenon caused by a difference in circumferential speed caused by the inertial energy of the log, and to reduce the inertial energy of the log. Cutting using this method is advantageous because there is very little risk of destroying the log.

Further, as in the embodiment, if the log drive roll is a drive roll having a large number of protrusions on the outer periphery, power can be supplied accurately, which is extremely effective. As a specific example, as illustrated in FIG. 1 or 2, a large number of protrusions 4 provided on the outer periphery of the drive roll 3 are placed on the outer periphery of the log above the cutting edge of the cutter. If the driving roll 3 is provided at a position where it bites into both the part and the veneer veneer 7 immediately after cutting,
The protrusions 4 form a cut from the surface of the veneer veneer 7, and the drive roll 3 is driven, so that the veneer veneer 7 immediately after cutting is stretched somewhat in the discharge direction. , good veneer veneer with less curl because it is stretched at a regulated rate 7
It was found in the experimental process that this could be obtained. In addition, the experimental results clarified the remarkable difference between when the drive roll is driven and when it is driven, but in any case, the veneer veneer with little curl was cut during the cutting process of the veneer lace. What is obtained is extremely advantageous for streamlining the plywood manufacturing process.

Of course, the protrusions of the drive roll do not necessarily have to be continuous in the axial direction, 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 the protrusion can be easily processed and assembled, and the groove-like space provides room for other members to be provided. 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, 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
Only by combining a log drive roll and a drive mechanism that normally sets the log drive circumferential speed of the log drive roll to be higher than the idling circumferential speed or driving circumferential speed of the log rotation mechanism, it is possible to achieve the original This purpose is to clarify that it can produce the following effects.

The above are some specific structures of the veneer lace of the present invention and its modified examples, but in any case, they are highly effective in solving the problem of destruction of raw wood and blade clogging during cutting, and are superior to conventional ones. This makes it possible to smoothly cut logs, etc., which were considered unsuitable materials for plywood, and also enables effective cutting of miscellaneous trees or small-diameter trees, which are expected in the future. This contributes to a significant improvement in productivity, especially in the cutting process.

[Brief explanation of the drawing]

The drawings are for explaining the veneer lace of the present invention, and FIGS. 1 and 2 are side cross-sectional views of the cutting part, FIG. 3 is an explanatory view of the drive system, and FIG. 4 is a front view of the drive roll. It is a diagram. 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 log drive roll that supplies driving force to the outer circumference of the log is provided at a position slightly higher than the cutting edge of the cutter, and a path is formed between the cutter and the log drive roll for the veneer veneer immediately after cutting, and In order to supply power to the outer periphery of the log just before cutting, the log drive roll is equipped with a drive mechanism, and separate from the log drive roll is provided with a log rotation mechanism that idles or drives the log, and the log drive roll A log outer circumferential drive type veneer lace, characterized in that the log drive circumferential speed of the log is normally set higher than the idling circumferential speed or driving circumferential speed of the log rotation mechanism.