JPH064241B2 - Log centering device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of application" The present invention, when rotary cutting of raw wood by veneer lace, according to the properties of the raw wood, either the whole body axial center which becomes the cutting center or the visual core is used. The present invention relates to a device for selectively determining and supplying veneer lace.

"Prior art" Generally, in order to determine the turning center in veneer lace of raw wood, the maximum inscribed circle common to both wood mouth end faces cut into appropriate lengths is calculated, and the center of this circle is calculated. It is done by

Specifically, in each plywood factory, etc., the operator puts his or her finger on both wood mouth end faces of the raw wood to measure the lengths of the long and short diameters that intersect at right angles, and then calculates the median line of the long and short diameters with black ink. It was marked as the center of turning by finding the intersection of the median lines.

As another method, a pair of concentric circles that project near the both mouths of the raw wood from a pair of projectors placed above are supported by a pair of pedestals that can move up and down and can move back and forth. Based on the above, adjustment is made by moving the pedestal up and down on the y-axis and by moving the pedestal forward and backward on the x-axis on both wood mouth end faces, and turning any concentric center inscribed in the outer shape of both wood mouth end faces as the turning center. I was there.

In addition, a pedestal on which the log is placed and a detector that detects the top of the log are placed relatively close to the end faces of both logs of the log, and the logs are held at an equal distance from the top and bottom. Seeking the center.

However, of the various methods described above, the first method sets the major and minor diameters of the end face of the log independently by the subjectivity of the operator, and is inevitable when calculating the median line from the measured major and minor diameters. It is difficult to maintain accuracy because there is an error in the image, and even in the second method, the concentric circles projected on the end faces of both mouths are images from projectors that are separated by a certain distance. Is widened, and it becomes difficult for the operator to distinguish the end face contour from the arbitrary concentric circles. Further, also in the third method, even if the amount of elevation of the pedestal and the amount of elevation of the detector are controlled to be equidistant, the cross section of each individual raw tree is irregular, so the holding state becomes inaccurate.

Further, in each of the above methods, both ends of the raw tree, or the positions in the vicinity thereof are used as the calculation criteria for determining the turning center, so regarding bending and deformation of the raw tree in the longitudinal direction,
In each case, the operator has to rely on the intuition of the operator, which further increases the error in the turning center. Therefore, when rotary cutting is actually performed with veneer lace, a large amount of veneer veneer with a narrow width less than the fixed size is cut out.

"Problems to be solved by the invention" In view of the above, the present invention is directed to the characteristics of raw wood, particularly in the vicinity of the central portion of the end face of the raw wood, where cracks, rot, cracks and other defects do not exist. In the automatic centering and feeding process, the raw wood is rotated with the upper provisional center as the center of rotation, the cross-sectional contours at a plurality of locations are detected in the longitudinal direction of the raw wood, and the total axial center calculated based on the cross-section contours of the veneer lace is calculated. It matches the turning center. On the other hand, if there is a defect in the log, part of the mechanism of the automatic centering and feeding process is used as it is, and the height is the same as the turning center of the veneer lace. The visual centering of the raw wood is aligned with the set lower provisional center, and the operation is selectively switched to the main-centering and feeding process in which this is aligned with the turning center of the veneer lace.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

A plurality of pairs of machine frames 1 are erected in the up-down direction at arbitrary intervals on the left and right sides, and horizontal beams 2 are horizontally installed between the upper parts of the machine frames 1 to form a gate shape and extend in the longitudinal direction. Horizontal beams 3 are fixedly connected between the upper portions of the machine casing 1.

A plurality of pairs of vertical guides 5 are attached at arbitrary intervals on the carrying-in side of the horizontal beam 2 of the raw wood 4, and in this embodiment, two vertical guides 5 are attached. A plurality of chain wheels 6 are supported on the upper and side portions of 2, and both ends of a chain 7 suspended between these chain wheels 6 are fixed to a lifting body 8, and the lifting body 8 is guided along a vertical guide 5. The roller 9 is supported as a guide so that it can be moved up and down. In addition, a support rod having a lock nut 10 attached thereto is provided at the hole of the projecting end of the lifting body 8.
11 is loosely inserted, and an upper surface detector 12 is installed at the tip of this support rod 11.

On the other hand, the pair of machine frames 1 located on both the left and right sides and facing each other
Elevating rails 13 are horizontally mounted between them, and the tip of the piston rod 15 of the lifting rail fluid cylinder 14 installed in the opposite direction on the side surface of the machine frame 1 is attached to the lifting rail 13.
13 can be moved up and down along the machine frame 1 via guide rollers 16.

Further, a chain wheel 18 connected to the chain wheel 6 supported on the horizontal beam 2 by the same shaft 17 and a chain wheel 19 at a vertically opposed position are supported and suspended between these chain wheels 18, 19. The chain 20 is fixed to the projecting end of the elevating rail 13, and the upper surface detector 12 is configured so that the elevating rail 13 can be moved toward and away from the elevating rail 13 at equal distances.

Further, on the lifting rail 13, a cradle 22 whose lower limit is below the surface of the carry-in conveyor 21 for loading the raw wood 4, and a cradle fluid cylinder 23 which can be moved back and forth on the lifting rail 13 during manual centering.
Is connected to the piston rod 24 and is movable for a predetermined horizontal distance.

On the other hand, for manual centering, the center of the chuck 26 of the veneer race 25, that is, the turning center S, and the center of the log 4 whose center is set to the same height are provided on the left and right extensions of the pedestal 22. A visual fluid for arranging a pair of optical detectors 27 such as a projector and a laser beam, which serve as a reference when the operator arbitrarily decides, and adjusting the pedestal 22 forward and backward with respect to the center of the optical detectors 27. The cylinder 28 is installed on the elevating rail 13, the tip of its piston rod 29 is connected to the rear part of the pedestal fluid cylinder 23, and the pedestal fluid cylinder 23 is movable back and forth along the guide member 30.

Next, between the front and rear machine casings 1 on both the left and right sides, a pair of guide shafts 31 are attached so as to face each other.
The perforated portions on both sides of the upper part of the bearing box 32 are fitted and inserted to support the bearing box 32. A support 33 extending from the lower end of the bearing box 32
A grasping fluid cylinder 34 is attached to the rear portion, and the tip of a piston rod 35 of the grasping fluid cylinder 34 is attached to the rear end of a spindle 36 which is fitted and supported in the substantially central portion of the bearing box 32.

At the tip of the spindle 36, a grip claw 38 for gripping the end face 37 of the raw wood 4 is attached, and in the vicinity of the center thereof, the rotation of the motor 39 installed at the lower part of the support 33 is fixed.
A chain wheel 41, which is passive via the shaft, is integrally inserted in the rotation direction, and the spindle 36 is axially slidable with respect to the chain wheel 41. At this time, as shown in FIGS. 12 and 13, the large gear 42 is integrally formed in the rotation direction on the driven side spindle 36 which is fitted and supported by the other bearing box 32 located opposite to each other. It is inserted again and the large gear 42
On the other hand, the spindle 36 is slidable in the axial direction. A small-diameter link gear 43 is meshed with the large gear 42, and a small gear 44 fitted to the shaft of the link gear 43 and a support 33.
A pinion 46 of the rotary encoder 45 attached to the gear is engaged with a log rotation angle detector 47 for measuring the rotation angle of the log 4 at every arbitrary angle.

Further, an x-axis correcting fluid cylinder 48 is attached to the central portion of the bearing box 32, and the tip of a piston rod 49 thereof is attached to one of the machine casings 1 and is arranged in parallel with the guide shaft 31. The rack 50 is provided with an x-axis correction device 53 that meshes the pinion 52 of the encoder 51 attached to the support body 33 to regulate the movement amount of the bearing box 32 from the backward limit.

On the other hand, the horizontal beam 2 is provided with a plurality of displacement amount detectors 54 for detecting an arbitrary cross-sectional contour in the longitudinal direction of the raw wood 4, in the present embodiment, three places near the center and both ends.

That is, a dog leg-shaped swing arm 56 is pivotally supported by a pin 57 between a pair of side plates 55 attached to a side surface of the horizontal beam 2 in the direction of loading the log 4 and a rear portion of the swing arm 56. Is pivotally supported on the displacement fluid cylinder 58, the tip of the piston rod 59 is pivotally supported on the upper portion of the pair of side plates 55, and the tip of the swing arm 56 is
The pin 57 contact portion is used as a fulcrum by fluid pressure to constantly contact the outer peripheral surface of the log 4. Further, the semicircular measurement plate 60 fitted to the pin 57 contact portion of the swing arm 56 and the pinion 62 of the encoder 61 attached to the side plate 55 are engaged with each other to swing the swing arm 56. The amount is being detected.

The displacement amount detectors 54 located on both sides are provided with the side plates 55 on the pair of adjustment shafts 63 attached to the cross beam 2 so that the detection positions can be freely moved according to the length of the log 4, as shown in the illustrated example. In some cases, the tip end of the piston rod 65 of the adjusting fluid cylinder 64 attached to the lateral beam 2 by being inserted and connected is connected to the side plate 55.

Next, the left and right horizontal beams 3 are used as rails, and traveling bodies 67 having wheels 66 supported at the four corners thereof are horizontally mounted in parallel with the lateral beams 2 and are reciprocally movable up to the veneer race 25.

On both left and right sides of this traveling body 67, a suspension body 69 is fitted and inserted into a horizontal shaft 68 arranged in parallel with the transverse beam 2 so as to face each other.
At the lower end of the traveling body 67, the tips of the piston rods 71 of the pair of suspension-use fluid cylinders 70 pivotally supported in opposite directions are attached, and each suspension body 69 is freely movable along the horizontal axis 68. I am trying.

Further, a conveying claw 73 is fitted into a pair of guide shafts 72 suspended from the lower end of each suspension body 69, and the rear end of the conveying claw 73 is attached to the suspension body 69 in the opposite direction. Attached to the piston rod 75 of the y-axis correction fluid cylinder 74, and
Engage the pinion 77 of the encoder 76 attached to the side of 69 with the rack 78 attached to the side of the transport pawl 73, and
A y-axis correction device 79 that controls the descending amount of 73 is provided.

At this time, the y-axis correction fluid cylinder 74 regulates the transfer claw 73 from its upper limit position into two stages, that is, the first-stage lowering T for y-axis correction and the second-stage lowering L after gripping the log 4. It Therefore,
As shown in FIG. 18 and FIG. 19, the position after the second stage lowering L slides on the outer periphery of the piston rod 75 in the cylinder chamber in order to regulate either the middle stage or the lower stage according to the size of the log 4 diameter. The circumscribed piston rod 80 may be internally provided.

In order to regulate the two-step lowering of the transfer claw 73, a fluid cylinder (not shown) for the second-step lowering L is further suspended in series on the piston rod 75 of the y-axis correcting fluid cylinder 74. Hold the body, connect the rear end of the transfer claw 73 to the tip of its piston rod (not shown), and mechanically move the first stage lowering T and the second stage lowering L of the y-axis correcting fluid cylinder 74. It is also possible to dispose a movable stopper (not shown) that regulates the above.

"Operation" First, the operation of the automatic centering and feeding process will be described.

When it is confirmed that there is no log 4 at the temporary centering position,
The piston rod 15 of the lift rail fluid cylinder 14 is extended to retract the upper surface detector 12 and the pedestal 22 to the open end.

Under this condition, the raw wood 4 carried in by the carry-in conveyor 21
Is temporarily stopped at the position of the upper surface of the pedestal 22, and the piston rod 15 of the lift rail fluid cylinder 14 is contracted. Along with this contraction movement, the pedestal 22 rises via the elevating rail 13,
The raw wood 4 is received from the carry-in conveyor 21 on the way of the ascent, and the amount of the ascent is increased by the chain wheel 18, the chain wheel 6, and the chain 17 which rotate in the arrow direction via the chain 20.
Is converted to a synchronous lowering amount to the pedestal 22 and the top detector 12.
To approach the same distance.

Next, when the upper surface detector 12 first contacts the upper surface of the log 4, the amount of fluid supplied to and discharged from the lift rail fluid cylinder 15 is adjusted to temporarily reduce the approach speed. Therefore, the upper surface detector 12 is gradually pushed up by the log 4 until the support bar 11 rises in the punched portion of the lifting body 8 and is detected, the impact at the time of stop is mitigated, and the temporary centering accuracy of the log 4 is set. We are trying to improve

At this time, in the log 4, the upper provisional center H is detected by the V-shaped inclined surfaces of the pedestal 22 and the holding movement of the upper surface detector 12 and the pedestal 22.

Next, at the centering position of the previously loaded raw wood 4, if the centering has already been completed and is absent, the piston rod 24 of the pedestal fluid cylinder 23 is reduced, and the pedestal 22 is placed on the lifting rail 13. Parallel transfer is performed for a predetermined distance A.

During this parallel transfer, the pair of grip claws 38 move to the retracted position, and
The bearing box 32 stands by at the backward limit on the guide shaft 31, and the swing arm 56 has its both ends positioned according to the length of the log 4 and is retracted to the upper limit. Therefore, the upper temporary center H of the raw wood 4 on the pedestal 22 and the center of the pair of grip claws 38, that is, the rotation center O are on the same line.

Next, a pair of piston rods of the grasping fluid cylinder 34
35 is extended so that both wood mouth end faces 37 of the log 4 are paired with gripping claws.
While being gripped by 38, the displacement fluid cylinder 58 is actuated to press each swing arm 56 retracted to the upper limit with a constant pressure in the longitudinal direction of the log 4 with the pin 57 contact portion as a fulcrum.

Also, in synchronization with this, lift rail 13 is moved to the lower limit
22 is returned to the backward limit position below the surface of the carry-in conveyor 21.

Then, if the drive of the motor 39 is transmitted to the chain wheel 41 via the chain 40, the spindle 36 is rotated and the log 4 is rotated once with the upper temporary center H as the rotation center O. At this time, the rotation amount of the log 4 is determined by the log rotation angle detector 47.
In addition, each arbitrary cross section in the vicinity of both ends and the central portion of the log 4 is a displacement amount detector from the rotation center O axis.
By 54, they are detected in synchronization with each other.

That is, in the log rotation angle detector 47, the rotation angle of the driven side spindle 36 is sequentially detected by the rotary encoder 45 via the pinion 46, while each displacement amount detector 54 has an arbitrary value. A swing arm 56 that swings the radius and declination from the rotation center O axis for each cross section with the contact portion of the pin 57 as a fulcrum.
The displacement amount is detected by the encoder 61 via the pinion 62 that meshes with the measuring plate 60.

Therefore, the electric signal of an arbitrary angle detected by the log rotation angle detector 47 and the electric signal of the displacement amount detected by the displacement amount detector 54 are synchronously taken out to detect a plurality of cross-sectional contours. . Each of these cross-sectional contours is input to a calculation device (not shown), is calculated appropriately based on each data,
The coordinate value of the gross axis G of the log 4 is obtained. Further, the deviations of the x-axis and the y-axis from this coordinate value and the upper provisional center H, that is, the rotation center O are obtained, and the x-axis correction device 53, y
Instruct each of the axis correction devices 79.

Next, the correction of each deviation will be specifically described with reference to FIGS. 16 to 19. Temporarily, the rotation center O is the origin (0,0) on the coordinate.
If the coordinate value (Gx, -Gy) of the overall axis G is used, the correction amount on the x axis is the predetermined advance amount B of the bearing box 32, for example, the advance to the branch perpendicular of the transfer claw 73 waiting at the upper limit position. Quantity, from (G
x) will be the amount of movement. Further, the correction amount on the y-axis is a predetermined lowering amount C of the transfer claw 73, for example, the radius + α of the chuck 26 from the distance from the lower end of the transfer claw 73 waiting at the upper limit position to the y coordinate (0), that is, It is a descending amount obtained by subtracting only the grip margin D of the chuck 26, and (-Gy) is subtracted from this to obtain the first stage descending T.

Therefore, if the coordinate value of the gross axis G is (0,0), that is, the same as the rotation center O, the movement amount of the bearing box 32 on the x-axis is the predetermined advance amount B, and the conveyance on the y-axis is performed. First of the nail 73
The step descent T becomes a predetermined descent amount C.

The calculated correction amount is first transmitted by the x-axis correction fluid cylinders 48 of the x-axis correction device 53 located on the left and right sides, and the guide shaft 31
The bearing boxes 32 are individually advanced along with, and the forward movement amount successively detected by the encoder 51 is returned to the arithmetic unit to accurately control the correction amount.

Next, the correction amount is transmitted to the y-axis correction fluid cylinder 74 of the y-axis correction device 79 located on the left and right, and the conveyance claw 73 is guided to the guide shaft.
While descending along 72, the descending amount successively detected by the encoder 76 is fed back to the arithmetic unit to accurately control the correction amount.

After the correction is completed, the pair of suspension-use fluid cylinders 70 are actuated to cause the conveying claws 73 to bite into the both wood mouth end faces 37 of the raw wood 4, and then the gripping claws 38 are separated from the both wood mouth end faces 37. After this time, the relative positional relationship between the transport claw 73 and the log 4 does not change until the log 4 is delivered to the chuck 26 of the veneer lace 25.

Under this condition, the y-axis correcting fluid cylinder 74 is operated, the piston rod 75 is extended, and the second stage lowering L of the conveying claw 73 is performed.
Reaches the waiting center J which is set at the same height as the turning center S of the veneer lace.

In FIG. 17, since the stroke length of the y-axis correcting fluid cylinder 74 is the same as the total distance of the first stage lowering T and the second stage lowering L, it is sufficient to set the piston rod 75 to the extension limit. Further, in the case of the y-axis correcting fluid cylinder 74 having the circumscribed piston rod 80 therein, the grip margin D is made variable according to the diameter of the log 4, and as shown in FIG. 18 and FIG. The second stage lowering L is controlled by each of them, and the piston portion of the piston rod 75 is brought into contact with the rod tip portion.

Then, the traveling body 67 is moved forward on the horizontal beam 3 by the constant distance E so that the total axis G of the raw wood 4 is matched from the standby center J to the turning center S, and the transport claw 73 moves the raw wood 4 by the chuck 26. The grip is exchanged.

If the second step L of the transport pawl 73 and the constant distance E advance of the traveling body 67 are performed at the same time, the supply time of the log 4 to the veneer race 25 can be shortened.

Next, the operation of the manual centering and feeding process will be described.

At the centering position of the automatic centering supply process, the upper provisional center H
After the raw wood 4 is gripped by the pair of gripping claws 38, the rotation of the motor 39 is transmitted to the drive side spindle 36 via the chain wheel 41 to rotate the raw wood 4, When the log rotation angle detector 47 detects that the driven side spindle 36 is not following the rotational power synchronously and accurately, the rotation is stopped.

However, the state in which the turning force is not transmitted to the driven side spindle 36 means that there is a defective portion 81 such as cracking, rotting, or cracking at least near the central portion of the wood mouth end face 37 of the log 4.
It cannot withstand the turning force required for the raw wood 4, the wood structure of the gripping portion is destroyed, and the gripping claw 38 turns around, which makes it virtually impossible to perform centering.

Therefore, the automatic centering / supplying process is switched to the manual centering / supplying process, and the cradle 22 that has once returned to the original position is advanced and raised again to the lower part of the log 4, and the grip by the grip claws 38 is released. Then, the log 4 is placed on the pedestal 22.

Then, in order to transfer the raw wood 4 to the center line between the optical detectors 27 at the temporary centering position, that is, the lower temporary center K position, the height of the pedestal 22 is changed by the lift rail fluid cylinder 14,
The front and rear positions of the pedestal 22 are adjusted by the pedestal fluid cylinder 23 and the visual fluid cylinder 28, respectively. The pedestal fluid cylinder 23 holds the piston rod 24 only at the extension limit and retracts the pedestal 22 by a predetermined distance A.
The substantial adjustment of the front-rear position is to operate the visual fluid cylinder 38 to move the pedestal fluid cylinder 23 forward and backward along the guide member 30 on the elevating rail 13.

With these adjustment movements, when the optical detector 27 is used as a pair of projectors, the visual center M, which is an arbitrary concentric circle center excluding the defective portion 81, based on the concentric circles projected on the end faces 37 of both logs of the log 4. , The lower provisional center K is centered. After centering, if the piston rod 24 of the pedestal fluid cylinder 23 is reduced to the limit, the pedestal 22 is transferred in parallel on the elevating rail 13 by a predetermined distance A, and the visual center M reaches the standby center J.

Next, the piston rod 75 of the fluid cylinder 74 for y-axis correction
Is lowered by the total distance of the first stage lowering T and the second stage lowering L, and the pair of suspension body fluids 70 are operated to convey the pawl.
73 is bitten into both wood mouth end faces 37 of the log 4, and the log 4 is gripped.

Further, while the cradle 22 is returned to the original position, the traveling body 67 is moved forward on the horizontal beam 3 by the constant distance E to match the visual core M of the raw wood 4 from the standby center J to the turning center S, and the conveying claws. From 73, the chuck 26 is used to grip and replace the raw wood 4.

Before the raw wood 4 is carried into the carry-in conveyor 21, the end faces 37 of both woods are inspected, and if there is a defective portion 81 that obviously causes the gripping claw 38 and the chuck 26 around the circumference, take them out each time. If it is stored once, and when the number reaches an arbitrary number, the process can be simplified by intensively performing the manual centering and feeding process.

[Advantages of the Invention] As described above, according to the present invention, a horizontal beam is laid horizontally in the horizontal direction between machine frames that are erected in the vertical direction, and the upper surface of the horizontal beam is hung up and down freely on the log-in side. A detector and an elevating rail, which is movable up and down along the machine frame, and on which a pedestal is movable forward and backward, can be contacted and separated via a connecting body. A pair of optical detectors set at the same height as the cutting center of the race are arranged, and the inside of the machine frame arranged side by side is provided with a bearing box which is horizontally movable by an X-axis correction device. A spindle with a gripping claw attached to the tip and a rotation angle detector was slidably inserted into each of them, and the horizontal beam above the machine frame was used as a guide to cross the veneer race for a fixed distance. On the traveling body, transfer claws that can be raised and lowered by the Y-axis correction device are installed from both sides. On the other hand, the displacement amount detectors are respectively attached to the base ends of the swinging arms arranged on the horizontal beam at arbitrary intervals in the longitudinal direction of the raw wood, and they are pin-contacted and further rotated. Based on the coordinate values of the total shaft axis calculated from the data of the angle detector and the displacement amount detector, the forward correction amount of the bearing box is sent to the X-axis correction device, and the downward correction amount of the conveying pawl is adjusted to the Y-axis correction device. The output of each process can be switched depending on the properties of the raw wood, and part of the mechanism of one process can be used as is in the phase difference divided into upper and lower parts within the same installation area. As a result, the whole axis center or the visual center can be matched with the turning center of the veneer lace, and the installation area of the centering device can be effectively used.

In particular, according to the automatic centering process, the raw wood carried on the carry-in conveyor is continuously regulated in one direction, and is supplied in a state where the veneer lace is automatically centered. The acquisition rate of continuous veneer veneer to be cut will be improved.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is an overall schematic explanatory view of an automatic centering / supplying step, FIG. 2 is an overall schematic explanatory view of a manual centering / supplying step, and FIG. 3 is an automatic centering. Fig. 4 is an explanatory view of the movement of the pedestal in the supply process, Fig. 4 is an explanatory view of the movement of the pedestal in the manual supply process, Fig. 5 is a perspective explanatory view of the temporary centering portion, and Fig. 6 is a partial cutting of the temporary centering portion. Notched front view, FIG. 7 is a partially cutaway side view of the centering portion, FIG. 8 is a notched front view of the same portion, FIG. 9 is a front view of the x-axis correction device, and FIG. 10 is the same plan view. 11 is a side view of the same, FIG. 12 is a front view of a log rotation angle detector, FIG. 13 is a side view of the same, FIG. 14 is a left side view of FIG. 6,
FIG. 15 is a front view of the y-axis correction device, and FIGS. 16 to 19 are explanatory diagrams of the correction amount. 1 ... Machine frame, 2 ... Horizontal beam, 3 ... Horizontal beam, 4 ... Log, 12 ... Top detector, 13 ... Lift rail, 21 ... Carry-in conveyor, 22 ...
Cradle, 25 ... Veneer lace, 27 ... Optical detector, 32 ... Bearing box, 38 ... Gripping claw, 47 ... Log rotation angle detector, 53 ... x-axis correction device, 54 ... Displacement amount detector, 56 ... Shake Moving arm, 67 ... Running body, 79
... Y-axis correction device

Claims (1)

[Claims] Claims: 1. A horizontal beam horizontally extending between machine frames that are erected in the up-and-down direction, and can be raised and lowered along the machine frame on the log-in side of the horizontal beam, and a cradle can be moved forward and backward. And a pair of optical detectors that are set up at the same height as the cutting center of the veneer race on the left and right extensions of the lifting rails that are vertically movable and extend in the direction of transporting the log. And a bearing box which is arranged side by side in the machine frame so that it can be moved back and forth in the horizontal direction by means of an X-axis correction device, a gripping claw is attached to the tip of the bearing box, and a rotation angle detector is attached to the bearing box. Spindles that were freely inserted and inserted, horizontal beams installed in the upper direction of the machine frame in the direction of transportation of raw wood, running bodies that were laid across the veneer race for a fixed distance using the horizontal beams as guides, and this running body Each side is suspended from both sides by Y-axis compensator. A conveying claw, a plurality of swing arms arranged on the horizontal beam at an arbitrary interval in the longitudinal direction of the raw wood, and a displacement amount detector attached to the base end of each swing arm and pinned. An arithmetic unit for inputting each data of the rotation angle detector and the displacement amount detector to calculate the coordinate value of the gross axis, and an X-axis correction unit for outputting the forward correction amount of the bearing box from the arithmetic unit. A Y-axis correction device that outputs the correction amount for lowering the conveying claw from the arithmetic device, the centering device for raw wood.