JPS6176316A - Centering device for log fed to veneer lathe, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention involves gripping and rotating the left and right butt end surfaces of a log to be a raw material, and driving a cutter that extends over the entire length of the log into the outer peripheral surface of the log by a predetermined amount. , A log centering device that determines the optimal center of rotation for raw wood before loading it into the veneer lace for thin sheets with wide sheets, such as veneer lace, which is used to peel off veneer veneers that are used as materials for plywood products. It is related to.

"Prior Art" Many log centering devices for veneer lace etc. take into account the shape of cylindrical logs with a substantially circular cross section.

- As an example, a log contact plate is provided below with a log receiver having a ■-shaped opening on the upper surface and configured to be able to be raised and lowered by a fluid cylinder, etc., while the lower surface is formed in a figure 7 shape facing oppositely to the log receiver, It is placed above the log receiver.

The log receiver with logs placed on its upper surface shaped like a letter ``■'' by a conveyor, etc. starts to rise, and in synchronization with the upward movement, the log contact plate also descends, and the amount of descent is equal to the amount of rise of the log receiver. The structure is such that the above-mentioned lifting and lowering movement stops with the log being held between the top and bottom by both, and the position is automatically set to be the virtual rotation center of the veneer lace, etc. of the log. It is a means. (For example, Japanese Utility Model Publication No. 47-8930.) "Problems to be Solved by the Invention" The above-mentioned prior art is based on the premise that the target raw wood has a cylindrical shape with a circular cross section. , the log is
For example, the closer the shape is to a tea caddy, the more accurate centering can be expected.

Therefore, as the target log moves away from the cylindrical shape, the centering accuracy inevitably decreases. However, in recent years, plywood factories have been using a variety of low-quality logs due to difficulties in obtaining raw materials due to circumstances between production areas, and the number of logs that closely resemble cylinders, such as the high-quality lauan used in the past, has gradually decreased. ,
For example, there are many logs that are twisted, have an unbalanced shape in the front and back of the axis, have a complex cross-section of a polyhedron, or have a lot of irregularities on the outer circumferential surface, and the centering using the conventional device cannot be satisfied. The situation has come.

The present invention is intended to solve the problem of poor centering accuracy for logs of various shapes, which is seen in conventional devices.

``Means for Solving the Problems'' The present invention provides a sliding member that allows the log to rotate on its own axis at the log contact part, and a log pedestal with an upwardly open shape that swings in the axial direction of the log. While it can be freely deployed, a clamping arm, which has almost the same structure as the log holder and has a log contacting part facing downward, is placed above the log holder, and the log holder and clamping arm are placed above the log holder. This problem can be solved by arranging the pedestals and arms so that they can move toward or away from each other in equal amounts up and down toward the virtual center, and by arranging at least two sets of these cradle and arm combinations in the axial direction of the raw wood. be.

"Operation" In the centering work of logs by the device of the present invention, with the logs placed on the log holders placed on the left and right sides of the log in the longitudinal direction, the left and right lifts, and at the same time, the holding arms of the upper waiting iso The cradle continues to descend in synchronization with the upward movement of the pedestal, and the virtual center of rotation of the log is brought out with both of them firmly holding the log from above and below. Up to this point, there is nothing out of the ordinary compared to conventional equipment.

Here, to explain the differences from conventional equipment, the log holder,
and the clamping arm both come into contact with the outer peripheral surface of the log,
A sliding member on which the log easily slides is disposed at the so-called log contact portion.

Therefore, the raw wood is able to rotate clockwise or counterclockwise to some degree depending on the complex outer circumferential shape of the log itself while being sandwiched between the pedestal and the arm from above and below.

Furthermore, both the log pedestal and the clamping arm are configured to be able to swing freely in the log axis direction by their support parts, and the moment they touch the log, or while the log is being sandwiched between them, the log It swings from side to side depending on the outer circumferential shape, and centers the log by holding it in the right place.

The above-described features of the present invention are effective when the log is twisted or when there is a large difference in thickness between the beginning and end of the log.

"Example" The details of the present invention will be described below with reference to the drawings. The drawings show one embodiment of the present invention, and FIG. 1 is a side view of the log centering device C, FIG. 2 is a front view of the log centering device C, and FIG. 3 is a partial side view of the log support and the clamping arm. .

In FIG. 1, 10 is a log holder. In this embodiment, it is formed into a crescent shape when viewed from the side, and the upper surface is a curved concave surface on which logs can be placed.

Further, as shown in FIG.
The lower part is supported in a hinge-like manner by a support member 15 so as to be able to swing freely in the direction c'.

The support member 15 further extends downward and is a lifting device constituted by a fluid cylinder such as oil or air pressure.
is locked, and therefore the log pedestal lO is lifted and lowered by its lifting device 17.
It is possible to move up and down in the directions of arrows A and A' by the lifting and lowering operation of .

Furthermore, as shown in FIG.
are arranged. In the illustrated embodiment, the sliding member is a plurality of rotating rollers arranged in a staggered manner, so that the log can be rotated on the pedestal in the directions of arrows B and B' if necessary.

In addition to a rotatable roller, the sliding member 13 may be a means such as a strip made of a material having a low coefficient of friction with the raw wood attached to the raw wood contact portion.

Reference numeral 20 denotes a clamping arm, which is usually placed directly above and facing the log holder 10.

The sides of the clamping arm are crescent-shaped, which is slightly slender than the log holder, and the lower surface, which is the log contacting part, is formed into the same downwardly curved concave surface as the log holder, and a sliding member 13 is further disposed. Further, as shown in FIG. 2, it is suspended in a hinge shape by a support member 25 so as to be swingable in the direction indicated by the arrow D' in the direction of the log axis, and furthermore, it is It is constructed so that it can be raised and lowered by the same amount in directions symmetrical to the raising and lowering of the log holder in the directions A and A'. In addition to the crescent shape, the side surface shape of the log holder and the clamping arm may be formed into a letter square shape or other polygonal shape.

C1C in the log holder 10 and the clamping arm 20
Although the swinging motion in the ', girder, and D' directions generally depends on the diameter of the log, it is sufficient for both to swing within a range of about 15 degrees to the left and right from the vertical center. It is preferable that the swinging range be adjustable by a stopper device configured as follows.

Furthermore, it is best to provide the stopper with a buffering mechanism such as a spring so that it returns to the vertical state as shown in FIG. 2 when no load is applied to the stopper, such as a log.

Note that since the suspended clamping arm self-maintains a vertical state by its own weight, the above-mentioned device may be omitted.

30 is a synchronous lifting device. There are four rotatable wheels 32 arranged vertically arranged on the sides of the log holders arranged vertically opposite each other and the clamping arm, and a connecting band 33 such as a chain wound endlessly between the wheels. , and connectors 34, 35, etc., which are secured to the intermediate portion of the connecting band.

The connecting tool 34 has one end of a horizontally extended lifting shaft 19 attached to it from the support member 15 of the log holder 10, and the upper and lower ends of the connecting tool are connected to a connecting band that circulates in the form of a rectangular loop up and down. It is connected and locked on one side (the left side in Fig. 1).

The connector 35 is connected to the support member 2 of the upper clamping arm 20.
5, one end of the horizontally extending elevating shaft 29 is engaged, and furthermore, the upper and lower ends are engaged with a coupling band on the opposite side of the coupling tool 34 (on the right side in FIG. 1). .

To explain the function of the synchronous lifting device 30 with the above configuration, when the log pedestal 10 rises in the direction of arrow A due to the operation of the lifting device 17 such as a fluid cylinder installed below, the log pedestal 10 moves horizontally from the bottom of the pedestal. The elevating shaft 19 extending in the same direction also rises together with the pedestal, and then the endless ring of the connecting band 33 begins to circulate in the clockwise direction via the connecting member 34.

Therefore, the connecting tool 35 that is locked on the other side of the connecting band (the right side in FIG. The arm 20 descends in the direction of arrow A'.

Due to the above-mentioned action of the connecting band, the log holder and the clamping arm both move up and down in equal and symmetrical directions, allowing them to approach or move away from the virtual center of rotation (centering center) of the log. There is.

Although the synchronous lifting device has been explained using the easiest-to-understand example, there are various arrangements, such as stopping the mechanical connection between the pedestal and the clamping arm and performing synchronous lifting and lowering of each separately using an electrical synchronization signal. .

In addition, in this embodiment, the log holder 10, the lifting device 17
etc. are placed below, and the clamping arm 20 for this is placed directly above it, but it is not necessary that they face each other in the vertical direction, and the virtual rotation center of the log (in Fig. They may be arranged diagonally above and below the intersection of the horizontal center line XX and the vertical center line Y-Y.

Further, depending on the surrounding conditions, the pedestal 10, the lifting device 17, etc. may be placed upward, and the holding arm 20 may be placed downward.

FIG. 4 is an overall side view of a series of equipment lines including a lace charger LC equipped with a log centering device C according to the present invention and a veneer lace VL that grips and rotates logs to lathe veneer. be.

In the embodiment shown in FIG. 4, the logs are transported along the horizontal center line XX over the entire line, and the centering device is the virtual rotation center of the log to be centered. Therefore, the distance from the center of the log pedestal moving away from or approaching the virtual center of rotation, and the clamping arm is:
It is constructed so that the distance is always the same.

Reference numeral 41 denotes pillars erected on the left and right sides in front of the centering device C, and running rails 44 on the left and right sides are installed between them and the mounts 42 mounted and fixed on the left and right frames of the veneer lace VL, respectively.
is being constructed.

Reference numeral 40 denotes a trolley, which has clamp arms 45 suspended from the left and right sides to hold the log after centering from its left and right end faces, and is a device capable of reciprocating on a running rail 44 in the directions of arrows H and H'. There is. Reference numeral 3 denotes a carry-in conveyor comprised of a conveyor belt such as a chain, which carries logs to be processed into the centering device C.

In addition to the embodiment shown in Fig. 4, various conveying means are available, such as transporting the logs diagonally to the veneer race, or transporting the logs in an arc using a swinging arm supported by a support shaft. be.

To explain the embodiment of the present invention in the embodiment shown above, initially in FIG. The robot is waiting at a distance above the virtual center of rotation.

From this state, the log is carried in and moved in the direction of arrow F by the carry-in conveyor 3, and when it reaches the log pedestal 10, the log pedestal starts to rise in the direction of arrow A,
Naturally, the upper holding arm also moves down in the direction of arrow A'.

Eventually, the log was sandwiched between the two from above and below, and its lifting and lowering became stagnant.
Due to the bending and deformation of the log, the skewness table, etc., the log can rotate arbitrarily in the directions of arrows B and B', or intertwine in the directions of arrows CSC, D, and D' in Fig. 2, respectively. After making small movements, the log is completely clamped between the two and the vertical movement is stationary.At this point, the intersection of the center lines X-X and Y-Y is the virtual rotation center of the log on the pedestal. It can be decided.

Next, the trolley 40 is stopped in advance on the vertical center line Y-Y line, and the clamp arms 45 are waiting in a state separated from each other to the left and right, and upon receiving a signal that the centering of the log is completed, the clamp arms are placed on the left and right end surfaces of the log. It approached, and eventually grabbed the log firmly with its left and right arms. Next, the log holders and clamping arms that were holding the logs from above and below were moved to A'
, and then descends and ascends in the A direction to separate from the centered log.

The trolley then proceeds to the veneer race side in the direction of arrow H, and if the veneer race is holding logs, it will wait at the intermediate waiting point, and if there is no log in the veneer race, it will advance to the race at once and stop the race. After the log is gripped by the spindle, the clamp arm moves away from the left and right and immediately returns to the centering position, YY point.

One of the log holders continues to descend after the clamp arm takes over the logs, and stops below the top surface of the carry-in conveyor.
In preparation for the next 6 logs, the same operation will be repeated.

"Effects of the Invention" According to the log centering device according to the present invention as described above, it is possible to use low-grade non-cylindrical logs, such as those that are unbalanced in the front and back of the axis, those that have irregularities on the outer peripheral surface, or those that are twisted. For objects that have large differences in thickness between the top and bottom ends, during the centering process, when the logs are held from above and below, the rotation of the logs and small movements in the axial direction will cause the logs to be placed in the right place. What is needed is a safe center of rotation for the log to be clamped.

In particular, when the diameters of the log differ greatly between the beginning and end of the log, large defects are exposed in conventional equipment.

In other words, normally, the lifting and lowering speeds of the log holders placed on the left and right sides must be the same, but in such a case, it is inevitable that the larger diameter will be faster. become.

In other words, the log continues to rise by the difference in thickness (in a diagonal state), and only the - side is clamped from above and below, resulting in the log being in a cantilevered state with only one end being diagonal. Since the small diameter side also rises to the same bell and is clamped, it becomes a complicated centering work in a state where both are forced.
Correct centering is often hindered.

According to the device of the present invention, the log pedestal and the clamping arm are
Since it swings freely in the axial direction, centering work can be performed in a nearly natural state, and furthermore, the device itself can be extremely simple.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, in which Fig. 1 is a side view of a device for extracting logs, Fig. 2 is a front view of the same device, and Fig. 3 is a side view of a log holder and a clamping arm. FIG. 4 is an overall side view of a series device including a lace charger and a veneer lace. 10...Log wood pedestal 13...Sliding member 15.25...Supporting member 17...Elevating device 20 ......Pinching arm -30...
...Synchronized lifting device 33...Connection band 34.35...Connector 40,...Trolley C...・・Centering device L・・・・Log wood LC・・Race charger VC・・・・・
...More than veneer lace

Claims (1)

[Scope of Claims] 1. A device for centering logs to be supplied to veneer lace, etc., characterized by comprising at least two sets of configurations A, B, C, and D below. A. A log holder that has an upper surface on which logs can be placed, has a sliding member placed in the log contact area, and is configured to be swingable by a support member. B A lifting device that lifts and lowers a log holder via a support member. C. It has a lower surface that is symmetrical to the upper surface of the log pedestal, and
A clamping arm that has a sliding member disposed at the raw wood contact portion and is configured to be swingable by a supporting member. D In synchronization with the lifting and lowering movement of the log pedestal, in a symmetrical direction,
A synchronous lifting device that raises and lowers the clamping arm by equal amounts. 2. The device for centering logs supplied to veneer lace or the like as set forth in claim 1, wherein the upper surface of the log holder is formed into a curved concave surface. 3. The device for centering logs supplied to veneer lace or the like as set forth in claim 1, wherein the sliding member is constituted by a plurality of small diameter rollers. 4. The device for centering logs supplied to veneer lace or the like as set forth in claim 1, wherein the lifting device is constituted by a fluid cylinder.