JPH10166307A - Raw-wood diameter measuring device, raw-wood centering device, and centering-supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a raw-wood diameter measuring device capable of measuring diameter of the raw wood directly precisely, and a centering device and a centering-supply device of the raw wood. SOLUTION: The centering device of a raw wood is composed of (1) a first measuring member 164 positioned in a direction intersecting the axial line of the raw wood 1 and capable of moving close to and apart from the side surface of the raw wood 1, and (2) second measuring member 162a located at an opposite side of the first measuring member 164 with respect to the axial line of the raw wood 1 and capable of moving close to and apart from an opposite direction of the first measuring member 164 relative to the side surface of the raw wood 1 in the direction intersecting the axial line, thus setting each center of cross sectional diameter of the raw wood fixed in the moving direction of their measuring members 164, 162a as coordinates of an expected core OL of the raw wood in terms of the moving distance of each measuring member 164, 162 from a predetermined reference position to be in contact with the side surface of the raw wood 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a log diameter measuring device for measuring the diameter of a log used for manufacturing veneer veneers and the like, and a rotary turning of a log using a veneer lace. The present invention relates to a centering device for determining the axis of the log, and a centering supply device for supplying the log whose axis has been determined in the centering device to a spindle chuck of a veneer race.

[0002]

2. Description of the Related Art Conventionally, in order to turn a log by veneer lace, a turning chuck of each of the logs is gripped by a spindle chuck which can move forward and backward with respect to both ends of the log (both ends), and then the spindle is turned. The plane table was sent along with the rotation to obtain veneer veneer. In this case, the turning of the raw wood is determined in a centering step performed prior to the turning step, and the raw wood is mounted at the spindle position of the veneer race at the turning axis. Here, as a method of determining the axial center of the log, for example, a method performed based on image data of the log edge detected by the image sensor, or a method in which the log is supported by a V-block or the like and the log edge is detected above it A method in which an optical sensor is provided, and a diameter of the log is calculated based on the elevating distance when the V block is raised until the log turns on the sensor in that state, and a shaft center is determined as a midpoint of the diameter. Etc.

[0003]

However, the image sensor or optical sensor used in the above method is
In each case, a log is detected using light as a medium, and therefore, there is a problem that erroneous detection is likely to occur if dirt or the like adheres to the sensor surface or disturbance light enters the detection beam.

[0004] It is an object of the present invention to provide a log diameter measuring apparatus capable of directly and accurately measuring the diameter of a log using a contact-type detecting member, a centering apparatus and a centering supply apparatus using the same. Is to provide.

[0005]

Means for Solving the Problems and Action / Effect In order to solve the above-mentioned problems, a log diameter measuring apparatus according to claim 1 of the present invention is characterized by including the following requirements. First measuring member: provided in a predetermined direction that intersects with the axis of the log so as to be able to approach and separate from the side surface of the log. Second measuring member: disposed on the side opposite to the first measuring member with respect to the axis of the raw wood, and provided so as to be able to approach / separate from the side of the raw wood in a direction crossing the axis from a direction opposite to the first measuring member. . Then, on the movement path of the first measuring member, the moving distance of the first measuring member from a predetermined first reference position separated from the side surface of the raw wood to contact with the side surface of the raw wood, and the second measuring member On the moving path, based on the moving distance of the second measuring member from a predetermined second reference position separated from the side of the log to the abutment on the side of the log, the direction along the moving path of the measuring member Measure the diameter of the log at.

In the above configuration, the diameter of the raw wood is directly measured based on the moving distance of the two measuring members from the reference position to contact with the side of the raw wood. Error detection is much less likely to occur, and the diameter of the log can be measured accurately.

More specifically, the log diameter measuring apparatus comprises a first moving distance detecting means for detecting a moving distance of a first measuring member, and a second moving distance for detecting a moving distance of a second measuring member. A value obtained by subtracting the moving distances of the first and second measuring members detected by the first and second moving distance detecting means from the distance between the detecting means and the first and second reference positions, A configuration may be provided that includes a log diameter calculating means for calculating a measured value of the diameter (claim 2).

[0008] At least one of the first and second measuring members may be formed in an elongated shape along a direction substantially perpendicular to both the moving direction of the measuring members and the axis of the log. . Thereby, even when a deviation of the log occurs in the longitudinal direction of the measuring member at the time of measurement, the influence of the deviation on the measurement accuracy of the log diameter can be reduced.

The first and second measuring members are respectively attached to one end of a piston rod, and the piston rod is moved toward and away from the side of the log by being driven to expand and contract by a cylinder. be able to. In this case, the first and second reference positions can be determined corresponding to the contracted position of the piston rod by the cylinder. The moving distance of each of the first and second measuring members from the first and second reference positions to contact with the side of the log is determined by the moving amount of the piston rod detected by the predetermined moving amount detecting means (ie, , Elongation amount or contraction amount). Thereby, the moving distance of the first and second measuring members can be detected with high accuracy (claim 4). Note that the movement amount detecting means can be specifically configured by a length measuring device such as a magnetic scale or a linear encoder for the amount of expansion and contraction of the piston rod. Further, the movement amount detecting means can be incorporated in the cylinder, whereby the configuration of the measuring system of the apparatus can be made compact.

The above-mentioned log diameter measuring apparatus may be provided with a log holding means for holding the log in a substantially horizontal state. In this case, the first measuring member is to approach and separate from the side of the log held by the log holding means from above, and the second measuring member is also approaching to the side of the log from below. -It can be constituted as being separated (claim 5). The diameter of the log can be measured efficiently by moving the measuring member close to and away from the horizontally held log. In this case, the log holding means may be a vertically movable pedestal supporting the log from below, and the second measuring member and the second measuring member may be brought closer to the pedestal with respect to the log. -The drive means for separating can be provided integrally (claim 6). By providing the second measuring member and its driving means integrally with the pedestal, the log diameter measuring device can be made compact, and the diameter of the raw wood can be reduced during the process of raising and lowering the log with the pedestal. It is efficient because it can be measured.

Next, the apparatus for centering a log of the present invention basically has the same essential configuration as that of the above-described log diameter measuring apparatus. The midpoint of the obtained diameter of the log is defined as the coordinates of the intended axis of the log (claim 7). Thereby, the configuration of the centering device can be simplified, and the axis of the raw wood can be accurately obtained.

In the configuration of the centering device, there is provided a raw wood holding means for supporting the raw wood substantially horizontally, and the first and second measuring members can be moved close to and away from the held raw wood from above and below. It can be provided (claim 8). This makes it possible to easily determine the midpoint of the log diameter, that is, the vertical coordinate of the axis.

[0013] The log holding means may support the log from below with a log supporting surface formed on the upper surface side. The log supporting surfaces are inclined in opposite directions to each other, and the inclination angles with respect to the horizontal plane are substantially equal.
It can be formed by two slopes. In this case, the log holding means shall support the log in a state where the horizontal coordinate of the axis and the horizontal coordinate of the point corresponding to the intersection of the two slopes coincide with each other in the axial section of the log. (Claim 9). If the log support surface is formed in this way,
The horizontal coordinate of the axis of the log can be determined geometrically by the shape of the log support surface and the axial cross-sectional shape of the log, and the vertical coordinate is determined by the first and second measuring members. Only in this way, the coordinates in both directions of the axial center of the log can be easily and accurately determined. In this case, if a raw wood pre-processed so that the shaft cross-sectional shape becomes a substantially perfect circle is used, the shaft center can be determined extremely accurately as the cross-sectional center of the raw wood, and this can be turned by veneer lace. It can be suitably used as a shaft core.

Next, the apparatus for centering and supplying raw wood according to the present invention comprises:
The above-described centering device, and turning the raw wood, which has been processed in advance so that the shaft cross-sectional shape thereof is substantially a perfect circle, and whose turning axis is determined by the centering device, against the veneer race on the downstream side, And a log supply mechanism for supplying the raw wood so as to be positioned at the turning center of the veneer race (claim 11). Thereby, a series of steps from centering of the log to supply of the log to the veneer lace can be efficiently and smoothly performed.

More specifically, the structure of the centering device portion according to claim 9 is used, and an elevating mechanism for raising and lowering the log holding means and a turning shaft center of the raw wood determined by the centering device are used. Turning axis positioning means for positioning the vertical coordinates with respect to the vertical coordinates of the turning center of the veneer race by raising and lowering the lifting mechanism can be provided. In this case, the log supply mechanism may include a log transport means for holding the log in which the vertical coordinate of the turning axis is positioned and transporting the log in the horizontal direction toward the turning center of the veneer lace. (Claim 12). This allows the log supply mechanism to position the turning axis of the log at the turning center of the veneer lace simply by moving the log in the horizontal direction, so that the positioning mechanism can be greatly simplified. Here, the moving distance of the log in the horizontal direction by the log supply mechanism can be determined by the horizontal distance between the axis of the log determined geometrically by the log holding means and the turning center of the veneer lace.

In the process of determining the axis center in the centering device, the radius of the log (that is, 1 / the diameter of the log) is used.
2) is also measured, and on the veneer race side, the stand-by position of the turning blade of the plane table with respect to the log is determined by the distance between the tip of the turning blade and the turning center line is calculated from the radius of the measured log. Can be set in advance to be large and as close as possible to the radius. That is,
By feeding back the cross-sectional diameter determined by the centering device to the stand-by position of the plane table of the veneer race, the log supplied to the turning center (spindle chuck, etc.) of the veneer race may collide with the turning blade of the plane table, or In addition, it is possible to solve the problem that the distance between the turning blade and the log is too large, and a time loss occurs before turning is started.

[0017]

Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. FIG. 1 is a side view schematically showing the whole log centering and feeding device 150 as one embodiment of the present invention. That is, the raw wood centering supply device 1
In 50, the first receiving frame 4 and the second receiving frame 5 are provided close to each other near the end of the log hole conveyor 2 that transports the log 1. The rear end of the first receiving frame 4 has a vertical shape, and the upper surface has a downward slope with respect to the transport direction. The upper surface of the second receiving frame 5 is inclined upward with respect to the transport direction, and a log detector (not shown) such as a proximity switch, a limit switch, or a reed switch is mounted on the upper surface. The first receiving frame 4 and the second receiving frame 5 are moved up and down in the opposite directions by an elevating mechanism (not shown), and the raw wood 1 from the log hole conveyor 2 is directed toward the delivery conveyor 13 on the downstream side. A feeding device for feeding books one by one is configured. The raw wood 1 was peeled beforehand,
It is supplied to the log hole conveyor 2 in a state where the cross section is processed into a substantially perfect circular shape by cutting or the like.

Next, corresponding to the exit of the delivery conveyor 13, the log 1 supplied from the delivery conveyor 13 is received on the lower side and supported by a receiving stand 39 (a log holding means).
Is provided so as to be able to move up and down. As shown in FIG. 22, the cradle 39 is formed in a V-block shape for supporting the log 1 from below, and the log support surface 39a formed on the upper surface thereof is
The two inclined surfaces are inclined in opposite directions and have substantially the same inclination angle θ with respect to the horizontal plane F.

As shown in FIG. 2 (a), the cradle 39 is arranged so that two pallets are opposed to each other in the longitudinal direction of the log 1, and the cradle 39 projects outward integrally therewith. It has the formed protrusions 151 and 152. The projections 151 and 152 have guide insertion holes 151a and 1
52a are formed. Further, the one projecting portion 151 has a female screw hole 154 substantially parallel to the guide insertion hole 151a.
Are formed. Then, as shown in FIG.
The screw shaft 155 is screwed into the female screw hole 154, and the servomotor 157 fixed to the frame 156 drives the screw shaft 155 to rotate in the forward or reverse direction. The guide members 151b, 152b respectively inserted through the 151a, 152a move up and down while being guided via the linear blocks 151c, 152c, respectively. The screw shaft 155, the servomotor 157, and the like constitute a lifting mechanism. In addition, as shown in FIGS. 1 and 2, the terminal side of the delivery conveyor 13 is disposed so as to enter between the receiving stands 39.

The receiving table 39 waits for reception of the log 1 at a receiving position where the log supporting surface 39a is slightly lower than the transport surface of the delivery conveyor 13. On the other hand, delivery conveyor 1
On the side of the log support surface 39a corresponding to the vicinity of the center of the log 3 in the width direction, a log detection sensor 41 composed of a limit switch or the like which moves up and down integrally with the receiving table 39 is provided. When it arrives at the position just above the log support surface 39a, it is urged to detect this. As will be described later, when the raw wood detection sensor 41 detects the raw wood, the receiving table 39 starts to rise, receives the raw wood 1 on the conveyor 13 at the raw wood supporting surface 39a, and thereafter supports the raw wood 1. It will continue to rise.

As shown in FIGS. 1 (a) and 1 (b), the lower part of one end face of the log 1 supported by the receiving table 39 is located above the conveying surface of the delivery conveyor 13 by a predetermined height. At the position, a horizontally long log detection member 40a along the transport direction of the log 1 is provided. Log detection member 40
As shown in FIG. 1 (b), a is provided integrally with the end of the turning member 40b.
Is turned around the turning axis 40c, so that approach / separation from the end face of the log 1 is allowed. As the log 1 arrives at the end of the delivery conveyor 13, the log 1 is urged to push the log detection member 40a outward at a lower portion of the end face. Thereby, the turning member 40b turns downward, and the limit switch 40 provided near the switch urging portion 40d provided integrally rotatably at an intermediate portion of the turning member 40b is urged. Arrival is detected. On the other hand, as the log 1 is raised from the state by the cradle 39, the turning member 40b is moved by the weight member 40e provided at the end opposite to the log detection member 40a to the gravity acting on the log detection member 40a. When the lower edge of the log 1 is separated from the conveying surface of the delivery conveyor 13 by a certain height, the limit switch 40
Is released.

Next, as shown in FIG.
Pushers 158 are arranged at positions corresponding to both end faces of the log 1 received by the cylinder 9, and the piston rod 160 to which the pusher 158 is attached is driven to expand and contract by a hydraulic cylinder 159. It comes to approach and separate from it.

Further, as shown in FIG.
Is provided with an air cylinder 161 (cylinder on the pedestal side) integrally therewith so that the piston rod 162 is vertically extended and contracted. Piston rod 162
A second measuring member 162a is attached to the tip end of the receiving table 39a by urging the air cylinder 161 with the contracted position located near the bottom surface of the log support surface 39a as a reference position. The second measuring member 162a extends toward the bottom of the log 1 supported by the
The extension can be stopped as shown in FIG. The extension amount of the piston rod 162 is detected by a length measuring device (extension / contraction amount detecting means) 163 such as a linear encoder incorporated in the air cylinder 161.

Returning to FIG. 1, above these receiving stands 39,
As shown in FIG. 6, the first measuring member 164 approaching / separating from the upper surface of the log 1 supported by the receiving table 39,
Are arranged corresponding to both ends. As shown in FIG. 3, the first measuring member 164 has a horizontal portion 164a extending substantially horizontally in the transport direction of the log 1, and the lower surface of one end of the horizontal portion 164a contacts the upper surface of the log 1. It is supposed to. On the other hand, a vertical portion 164b extends vertically upward integrally with the horizontal portion 164a from the upper surface of the opposite end. And the horizontal part 164a
A projecting portion 164c is formed so as to project laterally from the end of the piston rod 1.
The lower end of 66 is connected. Then, when the piston rod 166 expands and contracts by the air cylinder 165, the first measuring member 164 moves up and down to approach and separate from the log 1. Note that the horizontal portion 164a of the first measuring member 164 is positioned between the axis of the log 1 and the piston rod 16.
6 (that is, the moving direction of the first measuring member 164). On the other hand, the first measuring member 164 has, for example, one end of a piston rod 166 connected to its vertical portion 164b, and this is expanded and contracted by an air cylinder 165,
The log 1 is driven forward and backward in the radial direction. Accordingly, the first measuring member 164 is positioned at a predetermined position corresponding to the side surface of the end of the log 1 when the piston rod 66 is extended, and retracts outside the end surface of the log 1 when contracted. ing.

Here, as shown in FIG. 8, the extension amount of the piston rod 166 is detected by a length measuring device (expansion and contraction amount detecting means) 167 such as a magnetic scale or a linear encoder incorporated in the cylinder 165. Then, the extension of the piston rod 166 is stopped by the horizontal portion 164a abutting on the upper surface of the log 1 and the air cylinder 165 urges the first measuring member 164 in a direction of pressing against the log 1. And, as described later, the first measuring member 164
When the log 1 is displaced in the vertical direction (Y direction) due to displacement, the log 1 is urged by the cylinder 165.
, And also functions as a displacement amount detecting means for detecting the displacement of the log 1 in the Y direction.

The vertical movement of the first measuring member 164 is guided by the vertical portion 164b moving in a guide groove (not shown) formed on the side surface of the case 165a of the cylinder 165. Also, as shown in FIGS. 1 and 6, a beam member 168 extending in the transport direction of the log 1 on both sides in the longitudinal direction of the log 1 above the receiving table 39.
a is disposed, and the cylinder 165 is
It is fixed to the frame 168 passed between 8a.

Then, as shown in FIG. 3, the first measuring member 164 and the piston rod 162 of the receiving table 39 (and the second measuring member 162a attached to the tip thereof)
By the operation of the cylinders 161 and 165, respectively, the raw wood 1 is approached from above and below, and is pinched.
The diameter of the cross section of the log 1 is measured from the amount of extension of the piston rods 162 and 166 at that time.

Next, as shown in FIG. 1, a veneer race 169 is disposed downstream of the receiving table 39 in the transport direction of the log 1, and the log 1 is placed on a veneer race spindle 170 that provides a turning center thereof. By bringing the plane table 169a close to this while mounting and rotating, the log 1
Is to be turned. The pedestal 39 moves up and down while supporting the log 1, and performs positioning such that its axis is substantially the same height as the center of the veneer race spindle 170. A horizontal displacement detector 171 is arranged above the pedestal 39 on the side of the elevating trajectory of the log 1 so that the lower end position is substantially the same height as the veneer race spindle 170.

The horizontal displacement detecting body 171 is attached to the tip of a piston rod 173 that expands and contracts in the horizontal direction by an air cylinder 172 fixed to the frame 7, and is positioned on the side of the log 1 aligned with the receiving stand 39. It comes to approach and separate from one side. As shown in FIG. 8, a length measuring device 174 such as a magnetic scale or a linear encoder for detecting the amount of extension of the piston rod 173 is incorporated in the cylinder 172. As a result, the horizontal displacement detector 171 is urged by the air cylinder 172 so as to be pressed against the log 1 while being in contact with the log 1, and is displaced in the horizontal direction (X direction) due to the displacement of the log 1. It moves following and functions as a displacement amount detecting means for detecting the displacement of the log 1 in the X direction.

Next, as shown in FIG. 4, the aforementioned two beam members 168a (only one of them is shown in FIG. 4).
A moving beam 190 is disposed so as to straddle this, and the rails 1 laid on the beam members 168a are arranged.
A motor 193 rotatable in both forward and reverse directions reciprocates on the wheel 91 via wheels 192. Then, as shown in FIG. 1, on both sides of the moving beam 190,
A grip unit 175 as a log transport means for gripping the log 1 at both ends, which is aligned by the cradle 39.
Is provided. The grip unit 175 includes a moving arm 178 that is supported at an upper end side in a suspended state with respect to the moving beam 190 and extends substantially vertically downward, a base plate 177 that can be moved up and down on the moving arm 178, and a log of the base plate 177. 1 and a claw plate 176 that is slidable laterally with respect to the base plate 177 (transport direction of the log 1). Then, the moving beam 190 is moved to the beam member 168a.
By traveling on the upper side, the grip unit 175
As shown in (b), a constant stroke LT determined substantially horizontally between the log holding position K by the pedestal 39 and the center position Ov of the veneer race spindle 170, and according to the horizontal distance therebetween. (Hereinafter, the log supply mechanism of the gripping claw unit 175 by the moving beam 190 and the motor 193 is referred to as a traverser 195).
).

A plurality of transport claws (gripping claws) 70 are provided in a protruding manner on the surface of the claw plate 176 on the side facing the log 1. As shown in FIGS. 9A and 9B, each transport claw 70 is formed in a cylindrical shape,
On the end face facing the log 1, an inverted truncated cone-shaped slope 70 b is formed so that the inside is depressed, and the slope 70
An annular blade portion 70a having an acute cross section is formed by b and the outer peripheral surface 70c. Here, the blade portion 70
The tip angle a of (a) (the angle between the inclined surface 70b and the outer peripheral surface 70c) θ is adjusted in the range of 5 ° to 30 °. θ is 30
When the angle is larger than 0 °, the blade 70a is less likely to bite into the log 1, and when the angle is less than 5 °, the strength of the blade 70a is insufficient. Is preferably 15 to 25.
It is preferable to set the angle in degrees, and more desirably, to set the angle to approximately 20 degrees. It should be noted that the transport claws 70
Can be provided detachably with respect to the claw plate 176.

As shown in FIG. 4, the moving arm 178
The linear block 194 slides along a moving beam 190 on a rail 190a disposed on the upper surface thereof. Also, a hydraulic cylinder (gripping claw chuck cylinder) attached to the lower surface side of the moving beam 190
196 expands and contracts a piston rod 197 having a distal end connected to the moving arm 178, whereby the claw plate 1 is moved.
The entire gripping unit 175 including 76 moves toward and away from the end face of the log 1 supported by the receiving table 39. When the piston rod 197 contracts, the claw plate 1
Reference numeral 76 approaches the log 1, and as shown in FIG. 9C, the transport claws 70 bite into the end face of the log 1 at the blade portion 70 a and grip it. And, as shown in FIG.
In this state, the traverser 195 horizontally moves the gripping claw unit 175 so that the log 1 is
9 side.

Next, as shown in FIGS. 5B and 5C, the base plate 177 has a nut member 199 integrally provided on the side facing the moving arm 178.
The screw shaft 200 is screwed in the forward and reverse directions by a servo motor 198 provided on the moving arm 178 side, so that the screw shaft 200 moves in both the vertical direction (Y direction) along the moving arm 178. The claw plate 176 has a screw shaft 203 screwed to a nut member 202 provided integrally with the base plate 177 on the side facing the base plate 177.
Servo motor 20 provided on base plate 177 side
By being driven to rotate in both the forward and reverse directions by 1, it can be moved in both the left and right directions (X direction) with respect to the base plate 177. The moving arm 1 of the base plate 177
The movement with respect to 78 is guided by the guide rail 178a provided on the moving arm 178 side and the linear block 177a on the base plate 177 side engaged with the guide rail 178a. Also, the base plate 17 of the nail plate 176
The movement with respect to 7 is guided by the guide rail 177b on the base plate 177 side and the linear block 176a on the claw plate 176 side engaged with the guide rail 177b.

The servo motor 198, the nut member 199, and the screw shaft 200 constitute a Y moving mechanism 204 for moving the claw plate 176 in the Y direction in a direction along the end face of the log 1, and the servo motor 201, the nut member 2
02 and the screw shaft 203 constitute an X moving mechanism 205 for moving in the X direction. And these Y moving mechanisms 2
04 and the X moving mechanism 205 are used for the veneer lace spindle 170 of the log 1 gripped by the gripping unit 175.
, A position correction mechanism that corrects a position shift in two different directions.

Next, FIG.
FIG. 4 is a block diagram illustrating a configuration example of a control system of No. 0; That is, the control system has an I / O port 213 and a central control unit 214 including a CPU 210, a RAM 211, a ROM 212 and the like connected to the I / O port 213. The I / O port 213 includes servo drive units 215, 222 to 224 , Cylinder drive units 216, 219, 221, 225, and A / D converters 217, 218, 220, respectively. Then, the servo drive units 215 and 22
2 to 224, the servo motors 157, 19
3, 198, 201 and the rotational positions of the respective motors, that is, the pedestal 39 and the traverser 195 (gripping unit 17).
5) and a pulse generator (PG) 22 for knowing the current position of the transport claw 70 in the Y and X directions.
6 to 229 are respectively connected.

On the other hand, the cylinder drive units 216, 21
9, 221 and 225 have the air cylinder 161,
165, 172 and the hydraulic cylinder 196 are connected respectively. A / D converters 217, 218, 22
0 is connected to the receiving-side length measuring device 163, the length measuring device 167, and the length measuring device 174, respectively. The above-mentioned log detection sensor 41 and limit switch 40 are connected to the I / O port 213, respectively.

Further, the ROM 212 stores a control program 212a for controlling the operation of the whole log centering and feeding device 150. The RAM 211 also includes a work area 211a for executing the control program 212a, pulse counter memories 211b to 211d for counting pulse signals from the length measuring device 167, the length measuring device 174, and the receiving side length measuring device 163. A memory 211g at a reference position for raising the pedestal 39 (to be described later), and a memory 211 for a stop position (to be described later) when the pedestal 39 is auxiliary raised
h are formed respectively. The air cylinder 16
5. Length measuring device 167, air cylinder 172, length measuring device 17
4. Two sets of servo motors 201 and 198 for XY movement of the gripping claws 70 are provided on both sides of the log 1, including the corresponding A / D converter and servo drive unit. However, only one set is drawn in the above block diagram.

Next, from the servo drive unit 223 for Y movement of the gripper 70, the drive voltage of the corresponding servo motor 198 is supplied to the I / O port 2 via the A / D converter 300.
13 is input. This drive voltage value becomes weight reflection information reflecting the value of the weight of the log 1 gripped by the gripping claws 70. That is, when correcting the position of the log 1 in the Y direction, the gripper 70 gripping the
It must be driven upward (ie in the Y direction) against the weight of the log 1. In this case, if the rotation of the motor 198 is controlled so that the speed of the movement of the gripping claw 70 in the Y direction is substantially constant, the motor 198 during the constant speed operation is controlled.
Is higher as the load applied to the motor 198, that is, the weight of the log 1 is larger. Then, FIG.
As shown in (2), if the value of the winding resistance of the motor 198 is considered to be constant, the voltage drop in the motor 198, that is, the driving voltage of the motor 198 also increases as the weight of the log 1 increases.

Here, as shown in FIG. 25, the log 1 is placed on the veneer race 169 with respect to the axis of the log 1 (OL: FIG. 3).
) Is installed so as to coincide with the center line of the veneer race spindle 170, that is, the turning center.
When the spindle chuck 170a bites into the end face of the log 1, a displacement may occur between the axis of the log 1 and the turning center. Also, the spindle chuck 170
After biting a, the log 1 may be compressed by the weight of the log 1 to compress the portion located above the spindle chuck 170a, and the log 1 may hang down, resulting in displacement. Furthermore, as shown in FIG. 25A, the bending of the veneer race spindle 170 due to the addition of its own weight, or the bending of the raw wood 1 itself as shown in FIG. These displacements occur mainly vertically below the log 1, that is, in the Y direction.

The positional deviation amount of the log 1 (hereinafter, referred to as a turning holding position deviation amount) expected at the time of or after mounting on the veneer race 169 is, for example, apart from the portion generated when the spindle chuck 170a bites in. It is expected that as the weight of 1 increases, it will increase. Here, the amount of deviation of the turning holding position for each weight of the log can be obtained, for example, by experiment or calculation. In the present embodiment, as shown in FIG. 12, the value of the turning holding position shift amount obtained in advance by this experiment or calculation is associated with the drive voltage value of the Y movement motor 198 (that is, the weight of the raw wood). In this manner, the turning holding position shift amount conversion table 211i is stored in the RAM 211 in the form described above. FIG. 26A shows an example of a turning holding position shift amount conversion table 211i, in which ranges of drive voltage values (V0 to V1, V1 to V2, V2 to V3, V3) that are continuous with each other.
ＶV4, ‥‥; the turning holding position deviation amount is stored as β11, β12, β13, β14, ‥‥, etc. for each of V0 <V1 <V2 <V3 <‥‥, and is output from the servo drive unit 223. The value of the displacement amount corresponding to the value of the driving voltage is read out, and this value is used as a displacement prediction value when the log 1 is mounted on the veneer race 169.

As shown in FIG. 6B, the turning holding position shift amounts β11, β12, β13, ‥‥ are not the drive voltage value ranges but discrete drive voltage values V0, V1, V2 ‥.対 応 is stored in correspondence with 、, and the turning holding position shift amount corresponding to any driving voltage value that is not stored, based on the stored driving voltage value and the turning holding position shift amount,
For example, it may be determined by an interpolation method.

Here, as shown in FIGS.
Deflection of veneer race spindle 170 or log 1
The positional shift amount based on the deflection of itself may vary depending on the length W of the log as well as the weight of the log 1. For example, when the veneer race spindle 170 is extended by a predetermined length by driving a cylinder or the like (not shown) and bites into the end face of the log 1 to hold it, as shown in FIG. When the length W of the one is short, the amount of extension of the veneer race spindle 170 increases, and the spindle 170 is easily bent. Therefore, the turning holding position shift amount conversion table 21 shown in FIG.
1i, various length ranges (W0 to W1,
W1 to W2, W2 to W3, W3 to W4,...; W0 <W1 <W2
Regarding <W3 <‥‥), the turning holding position deviation amount for each drive voltage value (log weight) is stored, and the value of the deviation amount corresponding to the log length W is used. ing.

The log length W can be input, for example, from the input unit 301 connected to the I / O port 213 in FIG. 12, and the value of the input W is stored in the log length memory 211k of the RAM 211. Is done. On the other hand, motor 1
The value of the turning holding position shift amount read from the conversion table 211i according to the drive voltage value of 98 and the log length W is:
This is stored in the turning holding position deviation amount storage memory 211m.

The operation of the log centering and feeding device 150 will now be described with reference to the flow charts of FIGS.
This will be described with reference to the process explanatory diagrams of FIGS. First, FIG.
3 starts the control program 212a, and inputs the length W of the log 1 in S0. Next, in S1, the respective counter values N1 to N3 of the pulse counter memories 211b to 211d are cleared. Then, as shown in FIG. 16, when the log 1 is conveyed by the log hole conveyor 2 and the delivery conveyor 13 and reaches the position immediately above the receiving table 39,
In S2, the log detection sensor 41 detects the log 1 and stops the delivery conveyor 13. At this time, as shown in FIG. 1B, the log 1 is located below the end face of the log detection member 40.
The limit switch 40 is urged via a.

Next, in S4, the pedestal 39 starts to rise together with the log 1 as shown in FIG. Then, in the log 1, the bias of the limit switch 40 is released at a position where the lower edge of the log 1 has risen by a predetermined height from the transport surface of the delivery conveyor 13. Here, assuming that the distance from the transfer surface of the delivery conveyor 13 to the bias release point of the limit switch 40 is LS ', the pedestal 39 is raised to a height LS (= LS' + γ) further increased by a height γ. Is set. Elevating motor 15 for cradle 39
7 starts deceleration when the bias of the limit switch 40 is released, and the PG 226 (FIG. 12) after the release of the bias.
Is controlled to stop when a certain number of pulses corresponding to the height γ are output. Thus, the pedestal 39 stops in a state where the lower edge of the log 1 is positioned at the ascending reference position (S5). Then, as shown in FIG. 17 (b), the cylinder 159 of FIG. 2 is operated, and the pushers 158 on both sides move in a direction approaching each other, and move the log 1 on the pedestal 39 to center it. (S6).

Next, proceeding to S7 of FIG. 13, the air cylinder 165 and the receiving-side cylinder 161 are turned on, respectively.
As shown in FIG. 18, the piston rods 166 and 162
Respectively extend to the log 1 side, and the pulse counters N1 and N3 change the length of the length measuring device 167 and the receiving side length measuring device 163.
The counting of the pulse signal from is started. The piston rods 166 and 162 try to extend from the contracted position to the extended position, respectively. However, the first measuring member 164 and the second measuring member 162a hit the log 1 in a state where they are sandwiched. The extension is stopped, and thereafter, the state of being urged toward the log 1 by the air pressure of the cylinders 165 and 161 is maintained. Then, the extension amounts L1 and L2 of the piston rods 166 and 162 are calculated from the count values of the pulse counters N1 and N3 at this time. Here, the first measuring member 164 and the second measuring member 162a in a state where the pistons 166 and 162 are located at the contracted positions (corresponding to the first and second reference positions, respectively).
Since the distance L0 between them is fixed, the diameter D of the log 1
Is calculated as follows: D = L0− (L1 + L2) ‥‥‥ (1) (S8).

If the first measuring member 164 does not reach the log 1 even when the piston rod 166 is extended to the limit position when the diameter D of the log 1 is equal to or less than a certain value, the pedestal 39 is further added. It is also possible to measure the diameter D by raising the temperature. In this case, as shown in FIG. 17A, the auxiliary sensor 42 (in the present embodiment, the light projecting unit 42a and the light receiving unit 42b are connected to the limit position where the first measuring member 164 does not reach the log 1). Provided as a transmission type optical sensor). The flow of operation at this time is
In the flowchart of FIG. 13, steps S51 to S55 are added. That is, in S51, when the log 1 is not detected by the auxiliary sensor 42, the process proceeds to S52, where the pedestal 39 is raised, and when the upper edge of the log 1 is detected by the auxiliary sensor 42, the deceleration is started. The drive of the motor 157 is controlled based on the pulse output of the PG 226 (FIG. 12) so that the pedestal 39 stops at the additional ascending position located at a certain height above. Then, the distance L between the first measuring member 164 and the second measuring member 162a
0 is replaced with L0-L4 obtained by subtracting the amount of rise L4 (FIG. 17 (c)) of the cradle 39 from the above-mentioned ascending reference position to the additional ascending position. On the other hand, when the log 1 is detected by the auxiliary sensor 42 in S51, the process proceeds to S56,
The aforementioned value of L0 is adopted as it is. The following processing is the same. At this time, the holding unit 175
Moves to the gripping position of the log 1 (the position of the cradle 39).

When the diameter D of the log 1 is thus measured,
The axis OL of the log 1 is determined as the midpoint coordinates of its diameter by considering the cross section as a perfect circle. That is, as shown in FIG. 22, the log support surface 39a of the pedestal 39 has two inclined surfaces which are inclined in opposite directions to each other and have substantially the same inclination angle θ with respect to the horizontal plane F.
Is a point O corresponding to the X coordinate (horizontal coordinate) of the center of the cross section and the intersection of the two slopes in the axial cross section of the log 1
The log 1 is supported by the log support surface 39a in a state where the X coordinate of the (intersection) is geometrically matched. In this manner, the X coordinate of the axis OL of the log 1 is determined as the X coordinate of the point O of the receiving table 39 whose horizontal position is fixed, and the Y coordinate is the extension amount L1 of the piston rods 166 and 162 and It is determined based on L2.

When the axis OL of the log 1 is determined,
By raising 9, the height of its axis OL is matched with the height of the center Ov of the veneer race spindle 170 (FIG. 1). At this time, the moving distance LA of the receiving table 39 is determined by the first measuring member 16 in the contracted state of the piston rod 166.
Assuming that the distance to the center Ov with reference to the lower surface position of L.4 is Lv, then, as shown in FIG. 18, LA = (L1 + D / 2) -Lv ‥‥‥ (2) FIG. 13: S9 to FIG. 14: S1
1). The first measuring member 164 moves following the log 1 by the bias of the cylinder 165.

In this state, in S12, the hydraulic cylinder 196 (FIG. 4) of the holding unit 175 which has been waiting is actuated, and the transport claws 70 are brought into contact with both end surfaces of the log 1 as shown in FIG. Each bites into a load state, and is gripped. As a result, the log 1 of the log 1 is positioned at the same position as the center Ov of the veneer race spindle 170 in the height direction (Y direction), and in the horizontal direction (X direction) by the traverser 195 by the traverser 195. When the constant stroke movement is performed toward the center position, the shaft center OL is positioned so as to coincide with the center Ov. Further, as shown in FIG. 19A, the air cylinder 172 is turned on in S13, and the horizontal displacement detecting body 171 comes into contact with the log 1 in a state where it is urged by the cylinder 172. At this time, both the pulse count values N1 and N2 of the length measuring device 167 and the length measuring device 174 (FIG. 8) are cleared (S14), and the pedestal 39
Is lowered to the original position, so that the log 1 is supported only by the transport claws 70 (S15).

Here, the log 1 may be displaced from the position where the axis OL is positioned as the transport claw 70 bites. Also, as shown in FIG.
Is displaced so as to hang down by its own weight against the gripping force of the transport claw 70 with the release of the support by the receiving table 39. Then, the axis OL positioned as described above.
Causes a displacement to OL 'due to the displacement U based on these, the first measuring member 164 and the horizontal displacement detecting body 171 move following the log 1 and the pulse counter values N1 and N2 at that time denote the above-mentioned values. A Y-direction component UY and an X-direction component UX of the displacement U are calculated (S16). These component values UY and UX are stored in memory areas 211e and 211f of the RAM 211 (FIG. 12), respectively. The first measuring members 164 and the horizontal displacement detectors 171 on both sides of the log 1 are respectively connected to the log 1 on the corresponding side.
Is detected, and the values of the displacement components (UX, UY) are individually stored in the RAM 211.

In this state, as shown in FIG. 20, the traverser 195 (FIG. 1, etc.) starts transporting the log 1 together with the gripping unit 175 toward the veneer race 169 (S).
17). Then, during the transport of the log 1, the gripping units 175 corresponding to the Y moving mechanisms 204 and the X moving mechanisms 205 (FIG. 5) on both sides are independently driven so that the above-described displacement U is canceled. Then, the state of displacement of the log 1 is eliminated (S18).

Next, the process proceeds to the turning holding position deviation correction processing in S19. The details are as shown in FIG. That is, in S191, the drive voltage of the motor 198 (FIG. 12) at the time of the Y-direction correction in S18 (FIG. 14) is read from the servo drive unit 223. Here, as the value of the drive voltage to be read, for example, as shown in FIG. 24B, a voltage value VS when the rotation speed of the motor 198 reaches a steady value can be adopted. On the other hand, in the case where the log 1 is gripped while being positioned at a predetermined height, the motor 1
Reference numeral 98 denotes a state in which the rotation is stopped, but a constant voltage VS 'for generating a rotational torque in a direction in which the log 1 is pulled up is added, and the torque is used to position the log 1 against the gravity acting on the log 1. Will be held in position. In this case, since the voltage VS 'for generating the torque increases as the weight of the log 1 increases, it may be read as the drive voltage.

Next, in S192, the turning drive position shift amount β corresponding to the read drive voltage VS and the log length W
Are read out from the positional deviation amount conversion table 211i (FIGS. 12 and 26), and are set in the memory 211m (FIG. 12) as predicted values of the deviation amount, and S1
In 93, as shown in FIG. 21A, the position of the axis OL of the log 1 is added by −β in the Y direction by each of the Y moving mechanisms 204 on both sides so that the turning holding position shift amount β is canceled. to correct. In this case, when the turning holding position shift amounts expected to occur at the left and right ends of the log 1 are substantially equal to each other, the amount of the above-described additional correction may be applied by a value substantially equal to the left and right of the log. On the other hand, when the expected turning holding position shift amount has different values on the left and right of the log, additional correction of the corresponding amounts can be performed independently for the left and right. In this case, it is necessary to store two sets of the data of the turning holding position shift amount corresponding to the left and right of the raw wood. On the other hand, as a simpler method, it is also possible to perform additional correction corresponding to the average value on the left and right of the expected displacement amount by the same amount on the left and right of the log. In this case, it is sufficient to store only one set of the data of the turning holding position shift amount corresponding to the average value.

Then, as shown in FIG. 21B, when the log 1 reaches the position of the veneer race spindle 170, the traverser 195 stops moving (S22), and
Is a state in which the displacement U generated at the time of attachment to the gripping unit 175 has been eliminated, and an additional correction has been made to the turning holding position deviation β expected when attached to the veneer race 169, that is, the shaft center OL is While being displaced in the Y direction by -β from a position corresponding to the center (turning center) Ov of the race spindle 170, it is delivered to and mounted on the veneer race spindle 170 (S2).
3).

Here, as shown in FIG. 21 (b), the turning blade 1 of the plane table 169a on the veneer race 169 side.
The standby position of the 69b with respect to the log 1 is such that the distance between the tip of the turning blade 169b and the turning center line OV is larger than the measured radius of the log 1 (that is, の of the diameter) and is as close to the radius as possible. Can be set in advance as follows. That is, by feeding back the measured radius of the log 1 to the stand-by position of the plane table 169a of the veneer race 169, the log 1 and the turning blade 1 supplied to the turning center (spindle chuck, etc.) OV of the veneer race 169 are fed.
It is possible to solve the problem that the collision with the 69b occurs, or conversely, the distance between the turning blade 169b and the log 1 becomes too large, causing a time loss before turning is started.

When the delivery of the log 1 to the veneer race 169 is completed, the process proceeds to S24, where the gripping unit 175 enters the unloading state and releases the grip of the log 1. As a result, the log 1 is displaced downward by an amount corresponding to the above-mentioned turning holding position shift amount β due to droop due to its own weight, etc., but this almost cancels out the displacement −β by the additional correction. As a result, the log 1 is mounted on the veneer race 169 in a state where its axis OL is accurately positioned at the turning center OV.

In the turning holding position shift correction processing of the above embodiment, only the correction in the Y direction is performed, but the correction in the X direction can also be performed. In this case, the turning holding position shift amount conversion table 211i (FIG. 1)
In 2), in addition to the displacement in the Y direction, the displacement in the X direction may be stored. Further, the weight of the log 1 is detected by the drive voltage of the motor 198 for Y movement. However, the weight of the log 1 is detected by a drive current, or as shown in FIG.
A method is also possible in which the detection is performed based on the time change rate ΔV / Δt of the drive voltage (or the time change rate of the drive current) until the power supply reaches the steady operation state. Alternatively, the weight of the log 1 may be measured in advance using a weigher or the like, and the turning holding position deviation amount may be determined based on the measured value.

As shown in FIG. 14, the displacement of the log 1 may be corrected before moving to the veneer race 169 (S60, S61), or after reaching the veneer race spindle position. (S70, S
71). Further, when the value of the displacement is small and no particular correction is required, the apparatus may be configured such that the displacement correction processing is not particularly performed.

Next, as the transport claw 70, for example, FIG.
A conical shape shown in FIG. 9A or a knife shape shown in FIG. 9B can be used. However, as shown in FIG. Blade part 70
a, the contact area with the log 1 is large, and as shown in FIG. 4D, the blade portion 70a cuts into the fiber cell wall C of the log 1 so that there is an advantage that a strong gripping force can be obtained. . Further, as shown in FIG. 9C, the fibers F of the raw wood 1 enter the inside of the transport claw 70 while being compressed isotropically in the radial direction of the cross section thereof. The compression of the fiber F due to its own weight is less likely to occur, and as a result, the degree of displacement of the log 1 after the support by the pedestal 39 is released can be suppressed to a small extent. In addition,
As shown in FIG. 11, it is also possible to use a rectangular cylindrical transporting claw 70.

As shown in FIG. 7, the first measuring member 164 and the horizontal displacement detector 171 are not provided on both sides of the log 1 but, for example, one set corresponding to the vicinity of the center of the log 1 in the longitudinal direction. It is also possible to adopt a configuration in which only the provision is made. In this case, the Y moving mechanism 204 and the X moving mechanism 205 on both sides of the log 1
Is not performed independently on the left and right as in the above embodiment,
Based on the displacement of the displacement detected by the measuring member 164 and the detector 171, the same amount and the same direction of the log 1 can be corrected for the log 1. When the displacement of the log 1 in the X direction is small, the horizontal displacement detector 171 can be omitted.

In the above embodiment, the first measuring member 164
The horizontal displacement detector 171 is urged against the log 1 by the air cylinders 165 to 172, but may be urged using an elastic member such as a spring. Further, as shown in FIG. 23, the first and second measurement members 162a and 164a can be configured to abut on the side surface of the log 1 from an oblique direction. Further, the first measuring member 164 is connected to the piston rod 1
It is also possible to configure only the horizontal portion 164a attached to the tip of the 66.

In the embodiment described above, a case has been described where the turning axis is directly determined by using a log pre-processed so that the cross-section is substantially circular. The centering device can be used particularly for the purpose of determining the axis of a raw wood whose cross section is not processed into a perfect circle. For example, a log that has not been processed into a perfect circle is detected around the cross-sectional contour of the log using a non-contact sensor such as a contact sensor or an optical sensor while rotating around a temporary axis, and based on the contour shape. Although the final turning axis can be determined, the centering device of the present invention can also be suitably used for the purpose of determining the temporary axis.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing the movement of the entire apparatus according to one embodiment of the present invention.

FIG. 2 is a plan view and a side view schematically showing a configuration example of an elevating mechanism of the receiving table.

FIG. 3 is a side view showing a main part of the apparatus shown in FIG. 1;

FIG. 4 is a front view of the grip unit.

5 is a side view of the grip unit when viewed from the side opposite to FIG. 3, and sectional views taken along lines AA and BB thereof.

FIG. 6 is a front view showing an example of arrangement of a first measuring member and a plan view showing an example of arrangement of a horizontal displacement detector.

FIG. 7 is a front view and a plan view showing a modification of FIG. 6;

FIG. 8 is a side view showing a positional relationship between a measuring member and a detection body in a state of detecting a displacement amount of a log.

FIG. 9 is a perspective view of a gripping claw and an explanatory diagram of its operation.

FIG. 10 is an explanatory view showing some modified examples of the gripping claws.

FIG. 11 is an explanatory view showing another modified example.

FIG. 12 is a block diagram showing a control system of the raw wood centering supply device of FIG. 1;

FIG. 13 is a flowchart showing the flow of the processing.

FIG. 14 is a flowchart following FIG. 13;

FIG. 15 is a flowchart showing details of the turning holding position shift correction processing of FIG. 14;

FIG. 16 is an explanatory view of an operation process of the apparatus of FIG. 1;

FIG. 17 is a process explanatory view following FIG. 16;

FIG. 18 is a process explanatory view following FIG. 17;

FIG. 19 is a process explanatory view following FIG. 18;

FIG. 20 is a process explanatory view following FIG. 19;

FIG. 21 is a process explanatory view following FIG. 20;

FIG. 22 is a front view of a log supporting member.

FIG. 23 is a schematic view showing a modified example of a method of centering a log.

FIG. 24 is a graph schematically showing a relationship between a log weight and a motor drive voltage, and a time change of the motor drive voltage.

FIG. 25 is an explanatory view showing a state in which a displacement occurs when a log is attached to a veneer race.

FIG. 26 is an explanatory view showing some examples of a turning holding position shift amount conversion table.

[Explanation of symbols]

 Reference Signs List 1 log 39 cradle (log holding means) 150 log feeder 161 air cylinder 162a second measuring member 163 length measuring device (expansion / contraction amount detecting means, moving distance detecting means) 164 first measuring member 165 air cylinder 167 169 Veneer lace 169a Plane table 170 Veneer lace spindle 171 Horizontal displacement detector 172 Air cylinder 174 Length measuring device 175 Gripping unit (Log transporting device) 195 Traverser (Log feeder)

Claims (12)

[Claims] 1. A first measuring member provided so as to be able to approach / separate from a side surface of a log in a predetermined direction intersecting with the axis of the log, and the first measuring member with respect to the axis of the log. And the side of the log in a direction intersecting with the axis, approaching from the opposite direction to the first measuring member.
A second measuring member provided so as to be separable, and on a movement path of the first measuring member, from a predetermined first reference position separated from the side surface of the raw wood until it comes into contact with the side surface of the raw wood. The moving distance of the first measuring member, and the moving distance of the second measuring member, from the predetermined second reference position separated from the side surface of the log to the abutment on the side surface of the log. A log diameter measuring apparatus characterized in that the diameter of the log is measured based on a moving distance of the second measuring member. 2. A first moving distance detecting means for detecting the moving distance of the first measuring member; a second moving distance detecting means for detecting the moving distance of the second measuring member; From the distance between the first and second reference position, the value obtained by subtracting the moving distance of the first and second measuring members detected by the first and second moving distance detecting means, the diameter of the raw wood 2. A log diameter calculating means for calculating as a measured value.
Log diameter measuring device as described. 3. The first and second measurement members, at least one of which has an elongated shape along a direction substantially perpendicular to both a moving direction of the measurement member and an axis of the log. 3. The log diameter measuring device according to 2. 4. The apparatus according to claim 1, wherein the first and second measuring members are respectively attached to one ends of piston rods, and the piston rods are moved toward and away from the side of the log by being driven to expand and contract by a cylinder. The first and second reference positions are determined in accordance with the contracted position of the piston rod by the cylinder, and the first and second reference positions from the first and second reference positions until they come into contact with the side surfaces of the raw wood. The moving distance of each of the first and second measuring members is detected based on a moving amount of the piston rod detected by a moving amount detecting unit incorporated in the cylinder. Log diameter measuring device. 5. A log holding means for holding the log in a substantially horizontal state, wherein the first measuring member approaches and separates from the upper side with respect to a side surface of the log held by the log holding means. The said 2nd measurement member is also made to approach / separate from the lower side with respect to the side surface of the said log | wood similarly.
The log diameter measuring device according to any one of the above. 6. The log retainer is a pedestal that supports the log from below and that can be raised and lowered. The cradle includes the second measuring member and the second measuring member. 6. A log diameter measuring apparatus according to claim 5, wherein a driving means for approaching / separating from the main body is provided integrally. 7. A first measuring member provided so as to be able to approach / separate from a side surface of the log in a predetermined direction crossing the axis of the log, and the first measuring member with respect to the axis of the log. And the side of the log in a direction intersecting with the axis, approaching from the opposite direction to the first measuring member.
A second measuring member provided so as to be separable, and on a movement path of the first measuring member, from a predetermined first reference position separated from the side surface of the raw wood until it comes into contact with the side surface of the raw wood. The moving distance of the first measuring member, and the moving distance of the second measuring member, from the predetermined second reference position separated from the side surface of the log to the abutment on the side surface of the log. Based on the movement distance of the second measurement member, the midpoint of the diameter of the log determined in the movement direction of the first and second measurement members, as the coordinates of the intended axis of the log. A centering device for raw wood, characterized in that: 8. A log holding means for holding the log in a substantially horizontal state, wherein the first and second measuring members are:
The centering device according to claim 7, wherein the centering device is provided so as to be able to approach / separate from the held log in a vertical direction. 9. The log retaining means supports the log from below with a log supporting surface formed on an upper surface thereof, and the log supporting surfaces are inclined in opposite directions to each other and inclined with respect to a horizontal plane. It is formed by two slopes having substantially the same angle, and in the axial section of the log, the horizontal coordinate of the axis and the horizontal coordinate of a point corresponding to the intersection of the two slopes coincide with each other. 9. The centering device according to claim 8, wherein the centering device supports the log. 10. The first and second measuring members are respectively attached to one end of a piston rod, and are moved toward and away from the side of the log by the piston rod being driven to expand and contract by a cylinder. The first and second reference positions are determined in accordance with the contracted position of the piston rod by the cylinder, and the first and second reference positions from the first and second reference positions until they come into contact with the side surfaces of the raw wood. The moving distance of each of the first and second measuring members is detected based on a moving amount of the piston rod detected by a moving amount detecting means incorporated in the cylinder. Centering device. 11. A centering device for a raw wood according to any one of claims 7 to 10, wherein the centering device is preliminarily processed so that a shaft cross-sectional shape becomes substantially a perfect circle, and a turning shaft center is determined by the centering device. A log supply mechanism for supplying the obtained log to a downstream veneer race so that the turning axis of the log is positioned at the turning center of the veneer race. apparatus. 12. The centering device according to claim 9, a lifting mechanism for lifting and lowering the log holding means, and a vertical coordinate of the turning axis of the raw wood determined by the centering device, Turning axis positioning means for positioning with respect to the vertical coordinate of the turning center of the veneer race by lifting and lowering, The log supply mechanism holds the log in which the vertical coordinate of the turning axis is positioned, 12. The centering and feeding apparatus according to claim 11, further comprising a log transport means for transporting the raw wood horizontally toward a turning center of the veneer race.