JPH0124602B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for cutting a veneer veneer using a veneer lace.

(Prior Art) In recent years, plywood manufacturing factories have begun to use low-quality logs due to the deterioration of the raw wood situation or to reduce plywood manufacturing costs. On the other hand, in order to improve raw material yield and work efficiency, there is a demand for cutting low-quality raw wood logs into high-quality veneer veneers at high speed and cutting them into small diameters using veneer lace. I'm getting stronger.

However, a type of veneer race that rotates cut logs only by a so-called center drive mechanism, in which the logs are rotated by rotating the left and right spindles while holding the raw wood logs between the left and right spindles, satisfies these requirements. It's not a thing.

Therefore, recently, in order to address this problem, veneers have been developed in which a drive roller with a large number of blades on the outer periphery is brought into pressure contact with the attached raw wood log to supply rotational driving force from the outer periphery of the log. Emphasis is placed on lace research and development.

(Problems to be Solved by the Invention) However, in such a peripheral drive type veneer lace, scratches and cracks are likely to occur on the outer periphery of the raw wood due to the drive roller, and this area is squeezed by the pressure bar and wood chips are deposited on the upper part. This buildup sometimes passes through the pressure bar, causing damage to the surface of the veneer veneer or making the pressing force of the pressure bar uneven, reducing the quality of the veneer veneer.

In addition, since logs do not have a true cylindrical outer shape before cutting, such drive rollers cannot apply uniform pressure to the logs at the beginning of cutting, and as a result, the driving force is not applied to the logs. The uniform transmission may result in uneven thickness of the resulting veneer veneer, or the entire driving force may be concentrated on a part of the drive roller, resulting in damage to the surface of the veneer veneer and generation of wood chips. Another drawback is that it accelerates wear and tear on the outer peripheral blade.

The present invention has been made to solve these conventional problems, and an object of the present invention is to provide a method for cutting a veneer veneer without the above-mentioned problems.

[Structure of the Invention] (Means for Solving the Problems) The method for cutting a veneer veneer of the present invention is such that the veneer veneer cutting method of the present invention is such that the cutting tool is placed near the cutting edge of the cutting tool at a position where it can pierce the outer periphery of the log, and is approximately parallel to the cutting edge line of the cutting tool. a side drive mechanism in which a large number of disk-shaped drive members each having a large number of sharp protrusions on the outer periphery are arranged at appropriate intervals on a drive shaft; In a method of cutting a veneer veneer using a plywood race having a pressure member disposed in each space and a left and right spindle that grips both end surfaces of a log at a rotation position of the log and rotates the same, A mechanism for advancing and retracting the side drive mechanism horizontally or substantially horizontally with respect to the surface of the log is provided, and the side drive mechanism advances and retreats as a unit, and when moving backward, the log is moved only by a center drive method driven by a spindle. It is characterized by being driven in rotation.

That is, the present invention makes it possible to use a veneer lace whose cutting part has a specific structure under specific operating conditions where its capabilities are exhibited and its shortcomings are offset, and the side drive mechanism itself is also improved. This is characterized by the fact that the relationship between the side drive mechanism and the pressure member is specified within a certain position of the veneer race, and specific aspects are implemented to improve the operating conditions of the veneer race. The improvement of the side drive mechanism itself is achieved by displacing the rotating shaft, which is the central part, in the horizontal direction or approximately horizontal direction, rather than focusing on the variableness of the tip of the mechanism. be done.

(Example) The details of the example shown in the drawings will be described below.

FIG. 1 is a side view showing one embodiment of the present invention, and in this figure, a log 1 to be cut attached to a veneer lace is oriented in the axial direction of the log 1.
The left and right end surfaces of the left and right spindles are held by well-known left and right spindles, which are movable forward and backward, with their axes aligned. It can be rotated in the direction of the arrow by a so-called center drive method.

A cutting blade 2 for cutting the raw wood log 1 is fixed and tightened at a predetermined position on a planer stand 3 by, for example, a fluid cylinder (not shown) such as oil or air pressure. The pressure bar body 4 is normally located on the upper part of the planer stand 3, and its left and right end surfaces are integrally held together with the planer stand 3 and the pressure bar body 4, and the pressure bar body 4 is used for cutting by, for example, a feed screw (not shown). Based on the required veneer thickness, log 1
It is configured to move forward toward the raw wood log 1 by a predetermined veneer thickness per rotation.

As shown in FIG. 4a, the pressure bar 5a installed on the inclined surface of the log side facing the log 1 of the pressure bar body 4 is attached to the log 1 of the pressure bar body 4.
Either the pressure bar 5a or 5' or in notches at appropriate numbers of a single pressure bar (not shown), narrow holes L are formed through which a driving member 7, which will be described later, can move in and out toward the log 1.

And, these appropriate number of pressure bars 5a
For example, a fluid cylinder 5 such as oil or pneumatic
b. By other conventional means, the lower end portion is usually configured so as to be able to be pressed against the horizontal center line position on the outer circumferential surface of the raw wood log 1 to be cut.

Furthermore, as shown in FIG. 2, each of the appropriate number of pressure bars 5a is provided with
A positioning step portion 5c that sets the lifting pressure bar 6a by coming into contact with a positioning stopper bolt 6c of the lifting pressure bar 6a to be described later,
For example, it is provided in a direction substantially perpendicular to the contact sliding slope between the lifting pressure bar 6a.
6a, as shown in FIGS. 1 to 4a,
It is an elevating pressure bar installed to cover and open the narrow L part of the pressure bar 5a when viewed from the log 1 side to be cut, and this pressure bar 6a is formed slightly wider than the narrow L part,
Along the slope of the outer surface of the pressure bar 5a facing the raw wood log side, the slope is slid up and down by, for example, a fluid cylinder 6b such as oil or air pressure, or other conventional means. In this case, for example, the device is configured to be able to be set toward the horizontal line position of the raw wood log 1. Normally, the lifting and lowering pressure bars 6a are arranged along the entire length of the log 1 in the same number as the narrow portions of the pressure bars 5a, but some or all of them can be omitted if necessary. As shown in FIGS. 2 and 4a, 6c is a stopper for positioning the lifting pressure bar 6a in the height direction, which is attached to the jaw portion of the lifting pressure bar 6a that slightly protrudes left and right, for example. In this embodiment, each bolt is inserted and screwed into each of the left and right upper jaw portions of the lifting pressure bar 6a in a substantially vertical direction.
The lower end of the stopper bolt 6c is in contact with the bottom surface of the cutout surface 5c of the pressure bar 5a, and the lower end of the lifting pressure bar 6a is
For example, the relative height of the outer circumferential surface of the raw wood log 1 with respect to the horizontal line position is adjusted to determine the position.

For each of the pressure bar 5a and the elevating pressure bar 6a, the so-called height-related positioning in the substantially vertical direction is performed, for example, in the pressure bar 5a, as shown in FIG. By adjusting the lock nut, or the lock nut inserted into the height adjustment screw shaft when 5b is used as the height adjustment block part, or by adjusting the lock nut inserted into the height adjustment screw shaft part when 5b is used as the height adjustment block part, and in the lifting pressure bar 6a, the stopper bolt 6c shown in FIG.
and the bottom surface of the stepped portion 5c, respectively. However, when actually cutting a veneer veneer using this device, the pressure of the pressure bar 5a is affected by the pressure from one direction of the log to be cut.
The contact portion of the elevating pressure bar 6a with the outer periphery of the raw wood (lower tip of the pressure bar) is the fourth
b The pressure bar is displaced backwards to the right in the figure, and the entire tip of the pressure bar in the width direction (parallel to the axis of the log) moves back, reducing the pressure applied to the log, or partially in the width direction. As a result, the pressure applied to the raw wood becomes uneven, and the correct setting of the cutting edge is disrupted.As a result, defective veneers with uneven thickness are cut. Therefore, in order to eliminate these disadvantages, in order to counteract the substantially horizontal load from the raw wood, a stopper is provided in the horizontal or substantially horizontal direction on both or either of the pressure bars 5a and 6a. equipment is required. That is, for example, 4th b.
As shown in the figure, pressure bar body 4
The lower end of each of the pressure bars 5a, 6a is brought into contact with the lower end of the lower inclined surface of the tensioner to receive the pressing force applied to each pressure bar 5a, 6a from the side of the log 1 to be cut. Parvolt S is installed. Reference numeral 7 designates a known disk-shaped drive member having, for example, a sharp serration or a protrusion on its outer peripheral surface, and as shown in FIG. 4a, it is made of, for example, a thin steel plate,
Alternatively, it is made of a relatively thin rigid body such as a hard synthetic resin that has been specially processed to give it wear resistance. These driving members 7 are arranged to reduce the distance between the pressure bars 5a.
An appropriate number of logs are integrally mounted on the drive shaft 8a so that the outer periphery of the logs, usually one by one, peeks out from the L or notch portion all at once over the entire length of the raw wood log 1,
In response to a signal that is emitted when the log has a predetermined outer diameter, which will be described later, or at any time, for example, by an electric motor (not shown), etc., the log is rotated in the direction of rotation of the outer circumferential surface of the log 1 and in the opposite direction of rotation of the outer circumferential surface. As shown by the arrow, for example, it is driven at a constant rotation to side drive logs.

Reference numeral 8b denotes a bearing bracket that supports, for example, the left and right shaft ends of the drive shafts 8a of the drive members 7 arranged in an appropriate number. Reference numeral 9 denotes a female thread that is integrally attached to each of the right and left sides of the bearing bracket 8b, and 10 is a screw shaft whose one end is screwed into the female screw 9. The other end, which is not screwed together, is driven by an electric motor or the like via a worm wheel 11 and a worm 12, as shown in FIG.
An action of advancing and retracting the log 1 to be cut, such as moving the drive member 7 forward toward the log 1 to bring it into pressure contact, or conversely, moving the drive member 7, which is rotated in pressure contact with the log 1, away from the log 1. do.

In addition, when pressurizing and positioning the drive member 7 is performed only by a fluid cylinder, the raw wood to be cut may be partially or entirely hard and soft, and pressing only with a predetermined pressure will not cut the soft wood part. In this case, the drive member 7 digs in too much, causing problems such as being repulsed by the hard wood portion, making it impossible to set an appropriate pressurizing position. Therefore, for example, after rapidly moving back and forth to near the set position by operating a fluid pressure cylinder,
Locks the fluid cylinder to eliminate the buffering effect,
As in the embodiment shown in FIG. 1, a predetermined position is regulated by a screw shaft or the like. In this case, in this embodiment, the forward and backward movement toward the log 1 to be cut is explained as a movement in a substantially horizontal direction, but the cutting angle may be adjusted depending on the species of the log, hard or soft diameter grade, etc. It is common practice for veneer lace to cut a veneer using a cutting tool, and the driving member, which is placed on the plane stand and integrally receives the influence of cutting angle adjustment, also changes its angle in the forward and backward movement direction. .

Further, when actually cutting a veneer veneer, it is necessary to adjust the thickness in the vertical direction to a predetermined thickness of the veneer.

This vertical adjustment can be done, for example, by
This can be achieved by using the technology of the invention related to the present applicant's application described in No. 39758.

Next, as another example, in place of the pressure bar 5a shown in FIGS. 1 to 4b, a rigid type pressure bar 5', which is conventionally used in veneer laces, is loaded, as shown in FIGS. It is shown in Figure 6. In the figure, 4' is a pressure bar stand for the purpose of fixing the rigid type pressure bar 5' from above, and 4'' is a mounting hole for attaching the pressure bar stand 4' to the pressure bar body 4. etc., the pressure bar body 4 is tightened at a predetermined position, and the rigid type pressure bar 5' is housed and installed at a predetermined position to prevent it from jumping up or the like.

To describe the embodiment of the apparatus described above in more detail, first, the log 1 to be cut is aligned with the axis of the spindle using the well-known left and right spindles of the veneer race.
Its left and right end surfaces are tightly gripped, and then the spindle is driven and rotated in the direction of the arrow in FIG. 1 via a transmission source shaft, chain wheel, etc., using, for example, a DC continuously variable speed electric motor. In this case, normally, the drive member 7 attached to the pressure bar body 4 shown in FIG. The driving member 7 is the raw wood log 1 to be cut.
The drive member 7 is rotated in a direction away from the raw wood log 1, and the drive member 7 is moved back and separated from the raw wood log 1 by an appropriate amount. Next, the pressure bar 5a installed at a predetermined position of the pressure bar body 4
is lowered to a predetermined position near the horizontal center line (A-A center line shown in FIG. 2) of the log 1 to be cut by, for example, downward movement of the fluid cylinder 5b. . In addition, the elevating pressure bar 6a is operated by a fluid cylinder 6b, etc.
The log is lowered to a predetermined position near the horizontal center line of the log 1, brought into contact with the stopper bolt 6c and the bottom surface of the positioning step 5c of the pressure bar 5a, and the lower end of the lifting pressure bar 6a is moved to a predetermined position. Fix it in the height position.

Note that once the height positions of the pressure bar 5a and the lifting pressure bar 6a are adjusted with respect to the horizontal center line of the log 1, there is no possibility of damage to the lower end edge of the pressure bar 5a, 6a.
There is no need to make adjustments each time unless wear and tear occur.

In the above state, the pressure bar body 4 and the planer bar 3 are advanced toward the log 1 by a feed screw (not shown), and the log 1 is rotated in the direction of the arrow, and the pressure bar body 4 and the planer bar 3 are moved forward toward the log 1. By advancing the body 4 by a predetermined thickness of the veneer per rotation of the log 1, veneer veneer cutting is performed,
Veneer veneer is produced from veneer lace.

Subsequently, as the cutting of the veneer veneer progresses, the diameter of the raw wood log 1 gradually becomes thinner, and when the diameter reaches a predetermined size, a limit switch, for example, which is set after predicting the diameter class, is activated. , the predetermined log diameter is detected by another log diameter detection device.

The above-mentioned preset log diameter is the log diameter at which a better effect can be obtained by adding the side drive method to the center drive method alone; for example, when a non-cylindrical log is cut. The diameter used is the diameter at which the cylinder becomes a perfect cylinder, or a diameter slightly smaller than this. This log diameter is set for each individual log.

By the way, when the log diameter detection device detects that the log has been cut to a predetermined outer diameter and issues a detection signal, the elevating pressure bar 6a first operates upward, for example, by the fluid cylinder 6b. As a result, the drive member 7 rises to a height position that does not affect the movement of the log in one direction, and then stops.
At a constant circumferential speed of about 50 to 100 m/min), for example, it is driven in the direction of the arrow by an electric motor, etc., and at the same time,
For example, the screw shaft 10 is rotated by, for example, an electric motor or the like via a worm 12 and a worm wheel 11 shown in FIG. 1, so that the drive member 7 is moved forward in the direction of one log. Then, in a state in which the outer circumferential tip of this driving member is stuck a certain amount into the outer circumferential surface of the log log 1, the forward movement toward the log log 1 is stopped.

Next, the output of, for example, a DC continuously variable speed electric motor that rotationally drives the spindle that holds the left and right end surfaces of the log 1 is reduced to about 1/3 to 1/2 of the previous level, and In order to rotate in the direction of the arrow, contact pressure rotation with the outer circumferential surface of the raw wood log 1 by the drive member 7 is added, and the rotational drive mainly by the DC continuously variable speed electric motor,
The rotational drive from the drive member 7 acts auxiliarily,
Cutting of veneer veneer continues.

In the apparatus of the present invention, speed control in the center drive method using the driving force from the spindle and the side drive method using the driving force from the drive member 7 is performed, for example, as follows.

That is, in the initial stage of cutting using the center drive method alone, variable speed rotation control is performed to keep the outer peripheral speed of the log to be cut approximately constant, and after the center drive method reaches a predetermined narrow diameter dimension, , constant rotation control is performed so that the rotation speed does not become excessive. On the other hand, in the side drive method, constant rotation control is performed until a predetermined small diameter dimension is reached, and after the predetermined small diameter dimension is reached, log rotation is controlled by variable speed rotation control synchronized with the outer peripheral speed of the log to be cut. It will be done.

As the above-mentioned simplified means, it is also possible to use rotation control that keeps the outer circumferential speed of the log to be cut constant from beginning to end.

The cutting speed of veneer from veneer lace must be determined by taking into consideration the processing capacity of the cutting veneer processing equipment (veneer cutting machine, loading device, etc.) after veneer lace on the production factory line. Cutting a veneer from a raw wood log to be shaped, cutting a veneer after the outer circumference has become almost circular, and furthermore,
The cutting speed can also be changed to an appropriate number of steps to accommodate veneers that tend to fall apart without the toughness characteristic of rough wood, such as veneers cut from the core of raw wood logs. is desirable.

Therefore, the rotation peripheral speed of the drive member 7 is configured to be changed instantaneously in synchronization with the output speed of the veneer. It is desirable to be able to quickly follow the reduction of the driving force as well. In general, taking into account the processing capacity of the subsequent equipment, an appropriate number of stages of veneer production speeds are predicted and these speeds are set in advance.

In addition, as the diameter of the log to be cut decreases due to cutting, the pressure force and rotational driving force of the drive member 7 increase continuously according to the change in the log diameter, or in an appropriate number of steps for each diameter class. It is also possible to configure the process to be performed in stages. Upon completion of cutting one log to be cut, the pressing force and rotational driving force are also returned to the conditions when cutting a large diameter log.

In addition, from the beginning of cutting, the lifting pressure bar is raised and the driving member 7 acts on the log to be cut to perform cutting, or while the lifting pressure bar is raised, the driving member 7 is moved back and cutting is performed using only the center drive. A method such as the following may also be used as a means of simplifying the above operation.

For example, when cutting relatively high-quality logs, the drive member 7 is not applied to the log from the beginning of cutting, and the elevating pressure bar 6a is raised, and the cutting is performed using only the center drive from beginning to end. in this case,
The size of the bottom part L between the pressure bar 5a is small, and the pressure force applied by the pressure bar to the raw wood is normally limited to about 95% of the thickness of the cut veneer. By reducing the amount by ~3%, it becomes possible to cut a veneer that can be used as a veneer veneer for the front and back of plywood products.

Furthermore, it goes without saying that a veneer that has puncture marks remaining on both the front and back sides of the veneer on which the drive member 7 by the side drive was applied cannot be used as the front and back veneers.

Furthermore, there are various veneer configurations for forming plywood products, but all of them are a combination of thin veneers of 0.7 mm or less and thick veneers of about 1.3 mm to 3.2 mm. Among these, when cutting a thin veneer, rotary cutting using only a center drive and rotary cutting using a combination of a center drive and a side drive are performed. In the former case, there is no problem as explained in the above-mentioned cutting of the front and back veneers, but in the latter case, the thickness of the cut veneer is 0.7 mm.
The driving member 7 is in the condition of raw wood.
When a log is pierced by about 3 mm and rotated in cooperation with a center drive, the effect of the pierce is 2 to 3 mm (approximately 3 times the thickness of the cut veneer or more) as soon as the log is cut into veneer with a knife. There are many cracks that come out,
The veneer has a strong tendency to become fragmented and lose its properties as a veneer.
For this purpose, the amount of piercing of the driving member is significantly reduced, and cutting is performed by keeping the piercing amount approximately equal to the thickness of the cutting veneer, which is approximately 0.7 to 1 mm. As a result of concentrated force, the pierced part on the outer periphery of the log is likely to be damaged and dug up.
Transfer of rotational driving force becomes virtually impossible. Therefore, by reducing the side drive driving force (approximately proportional to the amount of thrust) commensurate with the amount of shallow thrust,
The side drive method, which does not cause damage to the log (which manifests as damage to the veneer) and reduces wasteful power consumption, and the center drive method from the left and right end faces of the log work together to enable smooth rotary cutting of the log.

On the other hand, due to the cost of plywood, inexpensive low-quality logs are on the market, and among them, sinking wood with a high specific gravity (logs that sink to the bottom of wood storage tanks) is increasingly being used. In particular, typical hardwoods such as serangan baht and kapor have large cutting resistance, and while rotational drive from the outer circumference of the log is effective, it is difficult to pierce the log with the drive member 7, and the piercing part is new. When it is sharp, it can barely pierce, but a considerable amount of pressure is required. For this reason, as cutting progresses and the diameter of the log becomes smaller, the bending of the log due to the pressure increases. It has been found that the center part of the steel sheet experiences a bending deflection of approximately 10 mm. The degree of deflection increases as the piercing portion of the drive member 7 becomes more worn, and also depends on the sharpness of the cutting blade. Furthermore, when the piercing cutting edge begins to wear out, piercing becomes difficult, and since it is being rotated, bad phenomena such as bending or breaking of the cutting edge part occur one after another. On the other hand, the harder the log, the greater the cutting resistance, and the assistance of rotational driving force from the outer periphery of the log is also effective.

While eliminating the above-mentioned defects, when cutting hard logs using an effective side drive, it is possible to reduce the amount of penetration of the driving member 7 into the log from the beginning, or as the cutting progresses, the drive member 7 A method is adopted in which the piercing amount of the drive member is made shallower before the diameter of the log where the bending of the log becomes apparent, and the driving force thereof is also reduced. The amount of piercing and the timing of reducing the driving force are determined empirically. Since there is no difference for the same tree species, logs of the same species are separated, and a predetermined diameter of the log is set in advance using a log external measurement mechanism installed on the veneer race, and the setting of the drive member 7 is automatically set. It is also possible to manually adjust the setting as desired, but even for materials other than hardwood, when the diameter of the log is small, the drive member tends to bend, so it is recommended to use a mechanism for measuring the outer diameter of the log to perform the automatic setting as early as possible. This is desirable. By eliminating these log bends, the yield of logs can be improved by about 5%, and wear and tear on the drive member 7 in the hardwood can be reduced. If the drive member 7 is made of thin steel plate, the lifespan is approximately two weeks for general materials, and the lifespan is even shorter for hardwoods, but depending on the piercing amount and driving force settings, it can last up to 20 days. It is possible to extend the lifespan to a certain extent.

Next, among the low-quality logs, there is a type of log with a weak core material called bunkie wood. During cutting, the fragile parts cannot withstand the load such as cutting resistance and break, making it impossible to cut these logs. Log cutting becomes possible only when the center drive from the center and the side drives from the outer periphery of the log work together to rotate the log. The ratio of rotational driving force is 7:
About 3 is good.

Next, in the case of a raw wood commonly known as castella, which has a weathered fan-shaped part surrounded by radiation starting from its axis center and is fragile, the side drive is used to rotate the raw wood in the fragile part of the fan-shaped part. Transmission of force becomes impossible, and rotational cutting is performed using the center drive. Even if a side drive is used in combination, both the amount of thrust and the driving force of the drive member 7 are reduced to the extent that rotation is assisted.

Furthermore, generally, a thin plate that will become the top plate is cut from the sapwood part of the log, and a thick plate that will become the middle plate is cut from the core part, and during this switching, the pressing force and rotational driving force of the drive member 7 are also cut. It is desirable to instantly switch to the optimum conditions for cutting these veneers. Of course, along with the operation of the gearbox's cutting feed rapid switching mechanism, we had previously proposed the
It is also desirable to adopt the blade edge rapid change device, the pressurizing force of the drive member 7, the rotational drive force rapid change mechanism, etc. described in the above publication.

Thus, the cutting of the raw log 1 to an extremely small diameter is completed, and at the same time as the cutting is completed, the drive member 7 is activated in response to a cutting completion signal from, for example, a limit switch placed at an appropriate position. In the same procedure, for example, by automatic or manual operation, the screw shaft 10 is rotated in the opposite direction to the direction of forward movement, so that the drive member 7 is separated from the raw wood log 1 side, or at the same time as it is separated, the rotation of the drive member 7 is stopped. and enters the standby state.

At the same time or before or after this, the lifting pressure bar 6a is lowered to a predetermined position by, for example, the downward operation of the fluid cylinder 6b, and the log 1 is driven to the center.
For example, the output of the continuously variable speed electric motor is restored to its previous level, and preparation for cutting a new log 1 to be cut is completed.

[Effects of the Invention] As detailed above, according to the method of the present invention,
Various effects such as the following can also be obtained.

When cutting the outer periphery of a non-cylindrical wood that is in the early stage of veneer cutting and is of poor quality, the center drive method is used alone to drive the wood in rotation, and then the side drive method is added to the process, resulting in fewer wood chips. , a rotational driving force is applied to the entire log, resulting in a veneer veneer with a uniform thickness and no damage to the surface, while reducing power consumption.

Since the drive member is provided at a position where it can pierce the outer circumference of the log near the cutting edge of the cutting tool, and the pressure member is placed in the space between the drive members, wood chips will not be generated by the drive member and the pressure member will not reach the top of the pressure member. Since the wood chips that are about to accumulate are sent backwards one by one by the piercing body of the drive member, damage to the surface of the veneer caused by the wood chips that accumulate on the upper part of the pressurer member as in the conventional device is avoided.
Other quality deterioration can be avoided. In addition, in one method of the present invention, the drive member is not driven at the initial stage of cutting, but since most of the cut veneers at the initial stage of cutting are waste veneers or short width veneers, problems due to wood chips may occur. There are almost no such things.

In addition, regarding the types of logs and cut veneers, logs with relatively good quality or partially high quality wood parts are rotary cut using only a center drive without any drive member acting on the good quality parts, so there will be no puncture marks. High-quality veneers are produced for the front and back of plywood products that do not have

Thin veneers can be cut using the side drive and center drive by adjusting the piercing amount and driving force of the drive member, so the veneer does not crack or fall apart, making it possible to cut thin veneers. Become. It is possible to cut logs that have a weak part in the middle by adjusting the driving force between the side drive method and the center drive method.

It is possible to cut logs that have a weak part in the middle by adjusting the driving force between the side drive method and the center drive method.

Hard logs can be cut by adjusting the piercing amount and driving force of the drive member, making it possible to cut logs to small diameters with a high yield without bending.

Furthermore, in addition to the above-mentioned effects, it is possible to obtain great effects such as reducing wear on the drive member and reducing power consumption.

[Brief explanation of drawings]

1, 2, and 3 are side views of an embodiment of the present invention, FIG. 4a is a front view thereof, FIG. 4b is a side sectional view thereof, and FIG. 5 is a conventional rigid pressure bar. FIG. 6 is a front view of FIG. 5. 1... Log log to be cut, 2... Cutting knife, 4...
Pressure bar body, 5a...pressure bar, 6a...lifting pressure bar, 7...driving member, 10...screw shaft, 21...electric motor.

Claims (1)

[Claims] 1. A disk-shaped drive member having a large number of sharp protrusions on the outer periphery is placed on the drive shaft in a position where it can pierce the outer periphery of the log near the cutting edge of the cutting knife, and is arranged approximately parallel to the cutting edge line of the cutting knife. A large number of side drive mechanisms are arranged at appropriate intervals, a pressure member is arranged in each space between the disc-shaped drive members of the side drive mechanism, and a pressure member is arranged in each space between the side drive mechanisms to rotate both end surfaces of the log at the rotation position of the log. In a method of cutting a veneer veneer using a veneer race having left and right spindles that grip and rotate the veneer race, a mechanism is provided for moving the side drive mechanism forward and backward in a horizontal direction or a substantially horizontal direction with respect to the surface of the raw wood log, A method for cutting a veneer veneer, characterized in that the side drive mechanism advances and retreats as a unit, and when retracting, the raw wood log is rotationally driven only by a center drive method driven by a spindle.