JPH0420001Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention involves rotating raw wood, which is a raw material, by sandwiching it from the left and right ends of the wood, and then inserting a long blade into the outer circumferential surface of the wood by a predetermined amount to produce plywood products. This is related to veneer lace, which turns the sheet-like veneer that serves as the raw material, and relates to a so-called lace charger, which is a log centering device that determines the optimal rotation center of the raw wood to be cut before loading the raw wood into the veneer lace. be.

``Prior Art'' Conventionally, the log centering device that has been most commonly used consists of a log holder configured to move back and forth and move up and down on each side, and a left and right log holder with a V-shaped opening on the top. A left-right moving cylinder presses the log placed across the length of the log from the left and right sides of the log to align the longitudinal center of the log, and projects the center of rotation of the left and right butt sides of the log, as well as a number of concentric circular images based on the center of rotation. It is equipped with a projector, moves the log back and forth, and up and down, aiming at the center of the image projected by the projector, and brings the outer periphery of the log as close as possible to the concentric circle of the image to determine the center of rotation of the log. (For example, JP-A-51-17083, or JP-A-50
-Publication No. 53968. ) ``Problem that the invention aims to solve'' Logs generally have different thicknesses at the head and end of the log, so the conventional log centering device described above does not allow the logs to be loaded and rotated at a specified speed. The distance raised to the center height differs on the left and right sides in the longitudinal direction of the log. To this end, the log holder is configured to be movable left and right separately to perform centering operations. In addition, in a lifting mechanism for a large-capacity fluid cylinder that lifts and lowers independently on the left and right sides, for example, two
It is also difficult to make the mechanical resistance equal for a set of devices.

Logs are usually brought to the centering device by a conveyor such as a chain conveyor, and it is rare that the logs are loaded so that the load is evenly applied to the left and right log pedestals. In most cases, the log is rolled over, and in order to correct this, a left-right moving cylinder is provided that advances equally to the left and right to press the left and right butt ends of the log and move the log in the axial direction. However, the outer circumferential surface of the log in contact with the log holder is not flat due to partial defects and bumps, and it is often impossible to move it from side to side using the moving cylinder.

As mentioned above, in conventional equipment, due to the log device being biased towards the pedestal and other reasons, the left and right log pedestals perform an unbalanced upward movement, causing the log to be lifted diagonally and eventually slip off the pedestal. This may cause a scandal, or the log may remain biased in the axial direction until it does not fall and is loaded into the next stage of the veneer race.
As a result of veneer turning being carried out at a position that protrudes from the scoring knife that regulates the product width of the veneer, problems such as the production of defective veneers that are less than a predetermined width occur. The present invention solves these problems with a simple device.

"Means for Solving the Problem" The present invention is to arrange a plurality of rolling members such as small-diameter rollers orthogonally to the log axis direction on the log contacting part of the log holder formed in a V-shape on the upper surface. A width-shifting cylinder that can press the end face of a log placed on a stand in the axial direction, a width-shifting detector using a pressure switch, etc., and a signal from the detector to regulate the retreating position of the width-shifting cylinder. The system is equipped with a backward restriction device using a timer such as a timer, and a control device that controls a series of these operations, and the elevating frame, in which the log holder and the width shifting cylinder are integrally locked, can be raised and lowered separately on the left and right sides using the elevating device. It is composed of

``Function'' Next, we will explain the function of the device of the present invention. When the logs are transferred by the carry-in conveyor and transferred and loaded astride the log cradle arranged on the left and right sides, a detection device such as a limit switch (not shown) installed on the cradle is installed. ), or after visually confirming that the logs have been placed on the left and right pedestals, press the push button switch and the pedestals will immediately begin to rise, and when the logs reach a height above the carry-in conveyor, photocells, etc. After receiving the signal from the height detector or visually confirming that the logs have reached a height higher than the conveyor, press the push button switch to move the width adjustment cylinders located on the left and right outside of the pedestal parallel to the log axis. Each of the cylinders rises together with the pedestal and approaches the log, and eventually the cylinder tip comes into contact with the left and right end faces of the log, and is further pressed to move the log in the axial direction and correct the imbalance. .

Furthermore, on the top surface of the log holder, that is, the contact area of the log, multiple rows of rolling members such as small-diameter rollers are arranged perpendicular to the log axis direction, making it easy to move the log in the axial direction. .

Next, the width-shifting cylinder continues to be pressed while holding the log from the left and right, and the fluid pressure inside the cylinder is increased to the set value, activating a width-shifting detector such as a pressure switch, and the control device It starts retreating in the opposite direction to the direction in which it was pressed, and the distance it separates from the left and right end surfaces of the log is determined by the time limit set in advance by a retreat regulating device such as a timer.
It will stop at a predetermined gap from the end face of the log.

The log will continue to be lifted up by the cradle and stopped at a predetermined position, and will be centered by front-to-back, up-and-down centering operations, but if the left and right log pedestals become lame for some reason, the log will The cylinder slides on the pedestal and moves lower, but the piston rod of the width-adjusting cylinder waits there to minimize the amount of movement, and also prevents the accident of falling off, which has been seen in the past. .

“Example” An example of the present invention will be described with reference to the drawings. Fig. 1 is a front view with veneer laces etc. omitted, and Fig. 2 is an overall side view of a series of devices, from a lace charger for centering raw wood to a veneer lace for turning a single sheet. In the figure, LC is race charger,
VL is veneer lace. Reference numeral 10 denotes a carry-in conveyor, which is a chain conveyor or the like that is intermittently driven in the direction of arrow A on which logs are placed.

The log holder 22 has a V-shaped opening on the top surface, and a plurality of rolling members made of small diameter rollers such as needle roller bearings are rotatably disposed orthogonal to the axial direction of the log to be mounted. , the lower surface is engaged with the inner upper surface of the elevating frame 20, and is also engaged so as to be movable in the axial direction of the log as necessary.

The width adjusting cylinder 31 is mounted and fixed on the outside of the elevating frame 20 with the piston rod facing inward, and a disc-shaped pressing member is fitted to the tip of the piston rod. In addition, the extension side of the width adjustment cylinder,
Alternatively, a width-shifting detector such as a pressure switch (not shown) is inserted in the outlet pipe, and the detection signal thereof is configured to be transmitted to the control device 35.

The elevating device 21 uses a fluid cylinder or the like, and is attached to the lower surface of the elevating frame directly below the log holder, so that it can be moved up and down in the directions of arrows B and B'. The elevating frame 20 has its base end like a cantilever beam held and guided by a column 29 erected on the floor so as to be slidable in the vertical direction, and a width-shifting cylinder is installed on the upper surface near the base end. A log holder 22 is placed and fixed on the upper surface of the protruding end portion formed by fixing the lumber 31, and furthermore, the end portion of the piston rod for raising and lowering the elevating device 21 using a fluid cylinder or the like is locked to the lower part of the stand 22. There is.

Note that the elevating frame 20 also has a simplified form in which the base end portion, etc., which is guided in elevating and lowering by the support 29, is omitted. In addition to the arrangement below the lifting frame 20, the lifting device 21 has a structure in which, for example, the base end of the lifting frame is suspended from a fluid cylinder loosely fitted in the left and right pillars 29, and the lifting frame is raised and lowered by the operation of the cylinder. There is also.

Due to the above configuration, the vertical movement of the lifting device 21 raises and lowers the log pedestal 22 and the width shifting cylinder 31 together via the lifting frame, and the logs loaded on the cradle and the width shifting cylinder 31 are raised and lowered in the height direction. They move up and down at the same time while their relative positions remain unchanged. These lifting frames 20, lifting devices 21, log pedestals 2
2. One set of width adjustment cylinders 31 is arranged on each side.

The control device 35 uses a height detector such as a phototube (not shown) to detect the passing of a log pedestal that is ascending with logs at a predetermined position (a point that usually avoids the height of the carry-in conveyor), and controls the left and right width shifting cylinders 31. The piston rod is advanced in the directions of arrows E and F, and when the end surface of the cylinder is reached, an increase in cylinder pressure is detected by a width shifting detector such as a pressure switch, and the cylinder piston rod is moved in the directions of arrows E' and F'. retreat,
It performs a series of controls related to lifting and lowering logs and width-aligning, such as stopping and waiting at a position slightly apart (usually 20 to 30 mm) from the butt end of the pressed log using a retreat control device such as a timer. In some cases, the advance of the width-closing cylinder is started without using a height detector, by visually confirming that the logs mounted on the pedestal have cleared the carry-in conveyor, and then by pressing a push button switch.

The pillars 28 are erected on the left and right sides of the floor and serve as the end portions of the race charger, and support the starting end of the running rail 27 above them. The end portions of the running rail are secured to mounts 53 that are respectively mounted and fixed on the left and right frames of the veneer lace VL placed in the front, and the running rail is horizontally installed on both the left and right sides, respectively. Note that the left and right pillars 29, which guide the elevation of the elevation frame 20, support the intermediate portion of the traveling rail in the longitudinal direction.

The trolley 25 is disposed on left and right running rails via wheels, and is configured to be movable in parallel in the directions of arrows G and G' by a hydraulic motor or the like. Reference numeral 26 is suspended near the left and right ends of the trolley 25 by clamp arms, and a plurality of barb-like log gripping claws are planted inside the lower end, and a fluid cylinder or the like is used to hold the trolley 25 in a suspended state.
The left and right sides can be moved toward and away from each other in the directions of arrows E and F or arrows E' and F' at the same time.

The veneer lace VL rotates the log L2, which has been centered and brought in from the lace charger, between the left and right spindles in the direction of the arrow H, and cuts the veneer by a predetermined amount into the log. It is to be carried out in the direction indicated by I.

To explain the embodiment of the present invention with the above configuration, in FIG. 2, logs are loaded on the carry-in conveyor 10 and transported in the direction of arrow A, eventually stop at a centering position (near the log pedestal), and then Log pedestal 22
When the log L1 is raised in the direction of arrow B, the log L1 is placed on the V-shaped upper surface of the pedestal and moved away above the carry-in conveyor.Subsequently, the width-aligning cylinders 31 that were waiting on the left and right move in the direction of arrows E and F. (See Figure 1)
When the end face of the log is reached and the log is pressed, the deviation in the longitudinal direction is corrected.Furthermore, when both cylinders press the log while sandwiching it, a width adjustment detector such as a pressure switch is activated, and both cylinder piston rods retreat. It is stopped at a predetermined position slightly apart from the left and right end faces of the log by a backward restriction device such as a timer.

Generally, the above-mentioned log width shifting is performed while the log pedestal and width shifting cylinder are rising together, but in some cases, the pedestal may temporarily stop at the height where it has dodged the carry-in conveyor. In some cases, the width-adjusting cylinder is activated, which is safer.

The log continues to rise to the centering height where the irradiation image of the projector etc. is projected, but during this time, the left and right lifting devices are lame, and even if the log tries to slide in either direction, the end surface of the log will not reach the centering height. The width-adjusting cylinder piston rods face each other at a close position, and their movement can be restricted to prevent them from falling off. Next, at the centering position, the log is moved back and forth and up and down in small steps to find the center of rotation of the log, and after the centering is completed, the clamp arms 26, which were waiting on the left and right sides of the log, are moved in the directions of arrows E and F. After moving forward and completely grasping the log, the trolley moves the log to the veneer race in the direction of arrow G.

On the other hand, the log holder moves down in the direction of arrow B', and the width adjustment cylinder 31 moves the piston rod away in the direction of arrows E' and F', descends below the carry-in conveyor and stops, and starts carrying in the next log. I'll have to wait.
Furthermore, when the trolley finishes gripping the logs with the veneer race spindle, it opens its clamp arms in the directions of arrows E' and F', and moves further in the direction of arrow G' in preparation for the next centering and loading of the logs.

``Effects of the invention'' As explained above, according to the present invention, a simple device prevents log falling accidents due to uneven vertical movement of the left and right logs in the left and right log holders, which are often used in log centering devices, and veneer laces in the next stage. This eliminates the problem of producing defective veneers that are less than a predetermined width during veneer turning work. Furthermore, by increasing the stroke of the width-shifting cylinder, the gap at which logs of various lengths wait from the end surface of the logs can be arbitrarily set using the retreat restriction device, making safe work universal.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front view with the veneer lace omitted, and FIG. 2 is a side view of a series of devices from the lace charger to the veneer lace. DESCRIPTION OF SYMBOLS 10... Carrying-in conveyor, 20... Elevating frame, 21... Elevating device, 22... Log cradle, 24
... Rolling member, 25 ... Trolley, 26 ... Clamp arm, 28, 29 ... Support column, 31 ... Width shifting cylinder, L1, L2 ... Log, LC ... Lace charger, VL ... Plywood lace .

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A log holder with a rolling member disposed at the contact portion of the log perpendicular to the axial direction of the log is placed on the upper surface, and left and right sides are configured to be able to be raised and lowered separately by an elevating device. an elevating frame; a width-shifting cylinder placed on the left and right elevating frames parallel to the axial direction of the log on the outside of the log holder; and an elevating device that is each locked to the elevating frame and operates vertically; 1. A width shifting device in a log centering device, characterized by comprising a control device that controls the operation of a width shifting cylinder in response to signals from a width shifting detector and a retreat regulating device. 2. A width shifting device in a log centering device according to claim 1 of the utility model registration, characterized in that the lifting device is constituted by a fluid cylinder. 3. A width shifting device in a log centering device according to claim 1 or 2, wherein the width shifting detector is constituted by a pressure switch. 4. The width shifting device in the log centering device as set forth in claim 3 of the utility model registration, characterized in that the retreat regulating device is constituted by a timer.