JP2520377B2 - Log diameter detector - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

This invention is, for example, the distance from the axis set on the mouth end surface of the cut raw wood to the outermost circumference, that is, the maximum turning radius of the raw wood when rotating the raw wood about the axis (from the axis to the outermost circumference in the following). The present invention relates to a raw wood diameter detection device that measures the distance to a maximum turning radius.

[Prior art]

For example, when feeding the chopped raw wood to the veneer lace, at least three centering arms arranged on both sides of the raw wood are rotated at equal angles in the centripetal direction and pressed against the outer circumference of the raw wood. The raw wood is centered by positioning the raw wood core at the center of a circle passing through the center of rotation of each centering arm. Then, the raw wood centered by a raw wood supply device or the like is moved to the veneer race side, the raw wood is chucked at the core position by the veneer lace spindle, and then the raw wood is cut by the veneer lace.

[Problems to be Solved by the Invention]

However, the cut raw wood itself, the cross section in the direction orthogonal to the axis including the wood mouth surface is not a perfect circular shape and is not constant,
Further, it has many protruding portions such as branches or humps on the outer circumference, and is in a non-round shape as a whole. When measuring the outer diameter of such a raw wood with the above-mentioned centering arm,
It was extremely unlikely that the centering arm would be located at the above-mentioned protruding portion, and the maximum outer diameter of the raw wood including the protruding portion could not be reliably measured. And when supplying the log centered as described above to the veneer lace by the log supply device,
According to the measured outer diameter of the raw wood, the turret is retracted in advance and waits. However, the retreat amount of the turret must be set to a large amount in consideration of the protruding portion of the raw wood. For this reason, prior to starting cutting with veneer lace, after advancing and approaching the tool rest so that the cutting knife contacts the outer circumference of the raw wood, advance according to the thickness of the veneer to be cut from the position. The raw wood had to be cut while moving the turret by the amount, and the cutting efficiency was poor. When such an operation is not performed, that is, when the raw wood is supplied to the veneer race with the tool rest retracted based on the measured outer diameter of the raw wood, the protruding portion of the raw wood is the cutting knife and nose bar of the tool rest. There is a possibility that the raw wood may be destroyed by colliding with the above, or the raw wood may be destroyed by the above-mentioned collision. Further, the above-mentioned drawback can be solved by increasing the number of measurement locations of the outer diameter of the raw wood in the axial direction, but it has a problem that the centering mechanism becomes complicated and the cost becomes high.

[Object of the invention]

In view of the above-mentioned conventional drawbacks, the object of the present invention is to have a non-circular cross section in the direction orthogonal to the axis including the mouthpiece surface with a simple configuration, or to accurately determine the maximum turning radius of the raw wood having a protruding portion on the outer peripheral surface, Another object of the present invention is to provide a raw wood diameter detection device capable of measuring in a short time.

[Means for solving problems]

Therefore, the present invention extends between a raw wood rotating member that rotates the raw wood at least once around a fixed axis parallel to the fiber, and a position on the axial line side on one side of the raw wood and a position beyond the outer circumference. A light source that emits light parallel to the axis toward the other wood mouth side of the raw wood, and a light receiving member in which a large number of light receiving elements are arranged facing the light emitted from the light source on the other wood mouth side of the raw wood, Among the light receiving elements in the light receiving member, a control means for measuring the distance from the axis to the outermost circumference of the raw tree based on the light receiving element that is shielded by the raw wood rotating by the raw wood rotating member and transits from the bright state to the dark state. It is characterized by having.

[Operation of the invention]

Since the present invention is configured as described above, while rotating the raw wood around a certain axis, it is parallel to the fibers of the raw wood over the width beyond the outer circumference from the position on the axial side of the raw wood while rotating the raw wood on the one hand. When parallel light rays are radiated toward the light receiving member arranged on the other side of the mouthpiece, among the light receiving elements arranged in the light receiving member, the light is shielded by the raw wood and transitions from the bright state to the dark state, based on the number of light receiving elements. The maximum turning radius of the raw wood including the protruding part is measured. Therefore, the maximum radius of gyration, which is the distance from the axis of the raw wood that has a protruding portion such as a hump or branch on the outer peripheral surface, to the outermost circumference It can be reliably detected.

【Example】

A raw wood diameter detection device according to the present invention will be described below with reference to the drawings showing an embodiment in which a raw wood centering and feeding device is embodied. FIG. 1 is a schematic front view showing the outline of a centering and feeding device equipped with a raw wood diameter detection device according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is an arrangement of the raw wood diameter detection device. It is explanatory drawing which shows a state, and the supply conveyor 3 is arrange | positioned at the carry-in side of the centering supply apparatus 1. FIG. A plurality of locking claws 3b are mounted on the conveyor belt 3a of the supply conveyor 3 at intervals according to the outer diameter of the raw wood 5 in the transport direction, and the supply conveyor 3 has a ball having a required length in the axial direction. Locking claws for cut logs 5
It feeds to the centering feeding device 1 while being hooked by 3b. The centering / supplying device 1 comprises a centering device 7, a raw wood diameter detecting device 9 and a raw wood supplying device 11. A log detection device 53 is attached to a frame (not shown) of the centering device 7, and the log detection device 53 outputs a log detection signal when the log 5 is supplied to the centering device 7.
Further, three support shafts 13a, 13b, 13c are attached to the frame at concentric positions, respectively. And each support shaft 13a
・ There are three centering arms 15a ・ 15b ・ 15c on 13b ・ 13c.
Both ends of the supplied raw wood 5 are rotatably supported. A link bar, a hydraulic cylinder (none of which are shown), and a centering detection device 57 are connected to each of the centering arms 15a, 15b, and 15c, and each centering arm 15a, 15b, and 15c is activated by the operation of the hydraulic cylinder. Tip of each support shaft 13a ・ 13b ・ 1
It is configured to rotate at the same angle toward the center of the circle passing through 3c. And each centering arm 15a ・ 15b ・
When the centering arms 15a, 15b, 15c come into contact with the outer peripheral surfaces of both ends of the log 5 supplied between the 15c, the core of the log 5 and the center of the circle passing through the support shafts 13a, 13b, 13c are almost The logs 5 are aligned and centered on the log 5. Since the configuration of the centering device 7 is described in Japanese Patent Laid-Open No. 57-31513, detailed description thereof will be omitted. Further, as the centering device 7, various conventionally known centering devices may be used. Further, the centering detection device 57 includes the centering arm 15
After the log 5 is centered with the rotation of the a, 15b, and 15c, a centering end signal is output at a delayed timing for a required time to finish chucking of the log 5 by the spindle 17 described later. do it. In each frame of the centering device 7, a pair of spindles 17 having an axis parallel to the fibers of the log 5 and constituting a part of the log rotation member facing each other are formed in a circle passing through the support shafts 13a, 13b, 13c. It is mounted so that it can move in the axial direction at the center. The spindle 17 is provided with the centering arms 15a and 15b.
-The raw wood 5 centered by the rotation of 15c is chucked at the core position. Further, an electric motor 19 forming a part of a raw wood rotating member is connected to the spindle 17, and by driving the electric motor 19, the raw wood 5 chucked by the spindle 17 is rotated at least once in a desired direction. A laser irradiation device 21 is attached to one of the frames of the centering and feeding device 1 as a light source forming a part of the raw wood diameter detecting device 9. This laser irradiation device 21
Irradiates a fan-shaped laser beam directed in the axial direction while spreading in a desired width in a radial direction orthogonal to the axis of the log 5 chucked on the spindle 17. The laser irradiation device
21 is an optical lens forming a part of the raw wood diameter detection device 9
23 is attached, and the optical lens 23 focuses the laser light emitted from the laser irradiation device 21 and spreading in a fan shape into a parallel light source parallel to the axis of the spindle 17. As shown in FIG. 3, the parallel rays cross the outer circumference of the raw wood 5 at right angles to the axis of the raw wood 5 on one side of the chucked wood 5 with a required distance 1 from the axis of the spindle 17. It is illuminated with the required width across the location. The other wood mouth side of the raw wood 5 in the centering and feeding device 1,
That is, the contact type image sensor 25 as a light receiving device forming a part of the raw wood diameter detecting device 9 is attached to the other frame so as to face the parallel light rays. As shown in FIG. 3, this contact-type image sensor 25 has a large number of light receiving elements R ¹
˜R ⁿ ( ⁿ is an arbitrary integer) are arranged at a pitch according to the detection accuracy of the log 5, and each of the light receiving elements R ^{1 to} R ⁿ outputs an electric signal based on the incident state of the corresponding parallel light rays. Output. The log supply device 11 includes a pair of supply arms 31 that rotate about a shaft 27 between the centering device 7 and the veneer race 29.
And a hydraulic cylinder 33 for urging the supply arms 31 so as to be close to each other, a numerically controllable electric motor 35 for rotating the shaft 27, and the like. Then, at the tip of each supply arm 31, a concave portion 31 corresponding to the outer diameter of each spindle 17 is formed.
a is formed, and the supply arm 31 holds both wood mouth surfaces of the raw wood 5 chucked by the spindle 17 at its core position by a claw provided at the tip thereof. A veneer race 29 is arranged on the carry-out side of the centering and feeding device 1. A pair of spindles 37 having an axis parallel to the axis of the spindle 17 are supported by a main body frame (not shown) of the veneer race 29 so as to be movable in the axial direction and rotatable in a desired direction. Then, the spindle 37 chucks the both wood mouths of the raw wood 5 supplied with the rotation of the supply arm 31 at the core positions thereof.
An electric motor (not shown) is connected to the spindle 37, and the spindle 37 rotates in a desired direction by driving the electric motor to rotate the chucked log 5. In addition, the main frame of the veneer lace 29 has a turret
39 is movably supported in a direction orthogonal to the axis of the spindle 37. A numerically controllable electric motor (not shown) is connected to the tool rest 39, and a feed screw 43 having an axis line in a direction orthogonal to the axis line of the spindle 37 is connected, and as the feed screw 43 rotates, the tool post 39 is rotated. The platform 39 is moved forward (in the direction closer to the spindle 37) and retracted (in the direction away from the spindle 37) toward the log 5. Further, a cutting knife 41 having a blade facing the axial direction of the spindle 37 is provided on the tool rest 39, and a nose bar which is pressed against the outer peripheral surface of the raw wood 5 chucked by the spindle 37 slightly above the cutting edge of the cutting knife 41. (Not shown) and are attached respectively. Next, an outline of control of the centering / feeding device configured as described above will be described. FIG. 4 is a block diagram showing an outline of control of the centering / feeding device 1, wherein a raw wood detection device 53 is connected to the CPU 51 via an interface 55, and the raw wood detection device 53 uses the cut raw wood 5 as the core. When supplied to the output device 7, it outputs a log detection signal to the CPU 51. The CPU 51 has a centering detection device.
57 is connected via the interface 55, and the centering detection device 57 brings the rotating centering arms 15a, 15b, 15c into contact with the outer periphery of the supplied raw wood 5 to bring the centering arm 15a into contact.
-A centering completion signal is output to the CPU 51 at a timing delayed for a required time for chucking to be completed by the spindle 17 after the load acting on 15b and 15c reaches or exceeds a predetermined value. A contact image sensor 25 is connected to the CPU 51 via an interface 55. Then, the CPU 51 reads, from the contact image sensor 25, an electric signal corresponding to the incident state of the parallel rays at every required time during the rotation of the log 5. A control device 58 of the veneer race 29 is connected to the CPU 51 via an interface 55, and the tool post data relating to the movement amount of the tool post 39 is input to the CPU 51 from the control device 58. Further, the CPU 51 outputs the raw wood diameter data of the raw wood 5 stored in the output buffer area 70 described later to the control device 58.
A ROM 59 is connected to the CPU 51, and a program area 61 of the ROM 59 is used to perform a centering operation of the raw wood 5, a raw wood diameter detecting operation of the centered raw wood 5, and a supply operation of the raw wood 5 to the veneer lace 29. The program data of is stored in advance. A RAM 63 is connected to the CPU 51.
In the input buffer area 65, the maximum value of the dark portion of the electric signal read from the contact image sensor 25 at the required time is stored. When the detected data D ¹ detected is larger than the detected data D ⁰ stored in the maximum value data area 67 of the RAM 63, the CPU 51 changes the detected data stored in the maximum value data area 67 from D ⁰ to D ¹ . rewrite. As a result, the maximum value data area 67 stores the detection data of the number of light receiving elements that have transitioned to the dark state according to the outermost peripheral side of the log 5. In the tool rest data area 68 of the RAM 63, the amount of movement of the tool rest 39 from the axis of the spindle 37, which is input from the control device 58, and accordingly, the tool rest data relating to the outer diameter of the raw wood 5 being chucked by the spindle 37, is stored. Remembered. RAM63
In the output buffer area 70, the raw wood diameter data obtained by adding the required distance l from the axial center of the spindle 17 to the light receiving element R ¹ to the detection data corresponding to the maximum diameter of the raw wood 5 stored in the maximum value data area 67 Is memorized. A centering arm drive circuit 69 is connected to the CPU 51. The centering arm drive circuit 69 is a log detection device.
When the log detection signal from 53 is input to the CPU 51, the hydraulic cylinder of the centering device 7 is operated to operate each centering arm 15a.
-Rotate 15b and 15c at the same angle in the centripetal direction of the circle passing through each support shaft 13a, 13b and 13c. A log drive circuit 71 is connected to the CPU 51, and after the log 5 is centered along with the rotation of the centering arms 15a, 15b, 15c and chucked by the spindle 17, When the centering arms 15a, 15b, 15c are rotated in a direction away from the log 5 and a centering completion signal is input to the CPU 51 from the centering detection device 57, the electric motor 19
Is driven to rotate the raw wood 5 chucked on the spindle 17 at least once. A supply arm drive circuit 73 is connected to the CPU 51, and the supply arm drive circuit 73 is at least one of the logs 5 chucked on the spindle 17 by the drive of the electric motor 19.
When the maximum radius of gyration was detected in association with the rotation, the electric motor 35 was driven to rotate the supply arm 31 in the clockwise direction shown in FIG. 1, and the tip of the supply arm 31 was positioned on both sides of the log 5. In this state, the hydraulic cylinder 33 is operated to move the supply arms 31 toward each other, and the raw wood 5 centered by the claws provided at the tip thereof is held at the core position, and then the spindle 17 is retracted. Unchuck the log 5. Next, the supply arm drive circuit 73 drives the electric motor 35 in the opposite direction to move the clamped log 5 to the veneer race.
Move to side 29. At this time, the CPU 51 calculates the rotation amount of the electric motor 35 based on the tool post data stored in the tool post data area 68 and the raw wood diameter data stored in the output buffer area 70, and the outer circumference of the raw wood 5 being cut. The electric motor 35 is drive-controlled to a position where the log 5 including the protruding portion 5a held by the supply arm 31 is as close to the surface as possible. Also, CP
The output buffer area based on the signal input when the cutting of the log 5 by U51 or veneer lace 29 is completed
The raw wood diameter data stored in 70 is output to the control device 58 and stored therein. Next, a method of measuring the maximum diameter of the raw wood 5 and a method of supplying the raw wood 5 to the veneer lace 29 by the apparatus configured as described above will be described with reference to FIGS. 1 to 8. FIG. 5 and FIG. 6 are explanatory views showing a state of detection of the maximum turning radius of the raw wood, which is cut into pieces and has a non-circular cross section in the direction orthogonal to the axis including the mouth end surface, or a pruning trace or a bump on the outer circumference. A centering arm 15 in which a raw wood 5 having protruding portions 5a such as is located on both sides of the raw wood 5 along with the drive of the supply conveyor 3
Supplied between a, 15b and 15c. When a log detection signal is input from the log detection device 53 with this supply, the CPU 51 outputs a centering command signal to the centering arm drive circuit 69 to operate the hydraulic cylinder. This allows each centering arm
15a ・ 15b ・ 15c are equal angles to the centripetal direction of the circle passing through each support shaft 13a ・ 13b ・ 13c with each support shaft 13a ・ 13b ・ 13c as the center,
The raw wood 5 is centered by rotating until it comes into contact with the outer peripheral surface of the raw wood 5 and making the center positions of the supplied raw wood 5 at both wood mouths substantially coincide with the centers of circles passing through the respective support shafts 13a, 13b, 13c. To do. After the centering detection device 57 outputs the centering completion signal after the centering, the pair of spindles 17 facing each other move in the axial direction to chuck the both mouths of the raw wood 5 at the centering position. , Return each centering arm 15a, 15b, 15c to the original position. Next, the CPU 51 outputs a rotation instruction signal to the log drive circuit 71 to drive the electric motor 19 to drive the spindle 17
The raw wood 5 chucked to is rotated at least once in the required direction. At this time, when a parallel light beam from the laser irradiation device 21 is directed from one side of the rotating raw wood 5 toward the other side of the raw wood 5 and is parallel to the axis of the spindle 17 from the optical lens 23, the contact image sensor. twenty five
Among the light receiving elements R ^{1 to} R ⁿ arranged in the above, the light receiving elements R ^{1 to} R ^k ( ^k is an arbitrary integer) corresponding to the maximum diameter of the log 5 including the protruding portion 5a are changed from the bright state to the dark state. An electric signal corresponding to the transition is output. Then, the CPU 51 reads the electric signal from the contact image sensor 25 and stores it in the input buffer area 65 at every time required for the rotation of the raw wood 5. That is, when the rotating tree 5 has a maximum diameter d _{1 at} a certain point as shown in FIG. 5, among the irradiated parallel rays, a parallel ray corresponding to the maximum diameter d ¹ of the tree 5 is a tree. The light-receiving element of the contact-type image sensor 25 corresponding to the shielded parallel rays because it is shielded by 5.
R ^{0 to} R ^k ( ^k is an arbitrary integer) transits to the dark state. Then, the CPU 51 stores the detection data of the number of light receiving elements that have transitioned to the dark state in the maximum value data area 67. Further, when the log 5 is further rotated and the projecting portion 5a on the log 5 is rotated to the irradiation position of the parallel rays as shown in FIG. 6, the number of light receiving beams corresponding to the maximum diameter of the log 5 including the projecting portion 5a is received. Since the elements R ^{1 to} Rp (p is an arbitrary integer p> ^k ) transit from the bright state to the dark state, the CPU 51
The detected data D ⁰ of the stored received number of elements R ^k to the maximum value data area 67, where it is stored rewritten the detected data D ¹ of the detected light receiving element number Rp. As described above, when the number of light receiving elements that have transitioned to the dark state due to the rotation of the log 5 is larger than the number of light receiving elements stored in the maximum value data area 67, the CPU 51 outputs the detection data stored in the maximum value data area 67. The maximum diameter of the raw wood 5 is stored by sequentially rewriting. Then, after the rotation operation of the log 5 is completed, the CPU 51 adds the detection data stored in the maximum value data area 67 with the distance l from the axis of the spindle 17 to R ¹ Are stored in the output buffer area 70. Next, after measuring the maximum turning radius of the raw wood 5 by the above operation, the CPU 51 outputs the tool post to the tool post in the direction orthogonal to the spindle 37 axis during the raw wood cutting output from the control device 58.
The tool post data regarding the position of 39 is stored in the tool post data area 68. As a result, the raw wood diameter data of the raw wood 5 cut by the veneer lace 29 is stored in the tool post data area 68. Then, the CPU 51 calculates the rotation amount of the supply arm 31 with respect to the veneer race 29 side based on the raw wood diameter data stored in the output buffer area 70 and the tool rest data stored in the tool rest data area 68. Next, the CPU 51 outputs a drive signal to the supply arm drive circuit 73, and the electric motor 35 is driven so that the supply arm 31 is positioned at the core position of the raw wood 5 chucked by the spindle 17 on both sides of the raw wood 5. After turning to the hydraulic cylinder
33 is operated to move the supply arms 31 in a direction in which they approach each other, and the raw wood 5 is held by the pair of supply arms 31.
Based on the signal output at the timing when the chucking of the log 5 by the spindle 17 is released, the electric motor 35
Is driven by the amount of rotation calculated based on the tool post data and the raw wood diameter data, and holds the raw wood 5 between them.
For example, 31 is rotated toward the veneer race 29 side as shown in FIG. As a result, the raw wood 5 including the projecting portion 5a held by the supply arm 31 is brought as close as possible to the outer peripheral surface of the raw wood 5 being cut. Next, when the cutting of the raw wood by the veneer lace 29 is completed, the CPU 51 outputs the raw wood diameter data stored in the output buffer area 70 to the control device 58. As a result, the control device 58 moves the tool rest 39 based on the inputted raw wood diameter data in the direction away from the spindle 37 at a distance according to the raw wood diameter data. Then, when the backward movement end signal of the tool rest 39 is input from the control device 58, the signal from the CPU 51 causes the log 5
The supply arm 31 that holds the rotary shaft 5 is rotated so that the position of the axis of the log 5 when rotated by the spindle 17 is substantially coincident with the axis of the spindle 37 as shown in FIG. Then CPU5
When the log supply end signal is input from 1, the controller 58 drives the spindle 37 to chuck the two wood mouth faces of the supplied log 5 at their core positions. At this time, the turret
Since 39 has retreated in advance based on the raw wood diameter data of the supplied raw wood 5, based on the maximum turning radius of the supplied raw wood 5, the tool rest 39 is brought as close as possible to the cutting knife for the outer circumference of the raw wood 5. The contact between 41 and nose bar 43 is avoided. After the chucking of the log 5 by the spindle 37 is completed by the above-described action, the 4PU 51 double-acts the hydraulic cylinder 33 to release the holding of the log 5 by the supply arm 31, and then drives the electric motor 35 to drive the supply arm 31. Is then rotated to the centering device 7 side where the maximum diameter to be cut is detected. Then, the raw wood 5 is rotated by driving the spindle 37, and the raw wood 5 is cut while moving the tool rest 39 in an amount of advance according to the thickness of the veneer to be cut. After detecting the maximum turning radius of the log 5 including the protruding portion 5a by repeating the above operation, the supply arm 31 is rotationally controlled and the tool rest 39 is retracted based on the log diameter data regarding the maximum turning radius of the log 5. Meanwhile, the raw wood 5 is supplied to the veneer lace 29 for cutting work. As described above, according to the present embodiment, as the centered raw wood 5 rotates, by irradiating parallel rays parallel to the axis of the raw wood 5 from the one wood mouth side toward the other wood mouth side, an axis line including the wood mouth surface is obtained. It is possible to accurately detect the maximum turning radius of the log 5 having a non-circular cross section in the orthogonal direction or having the protruding portion 5a on the outer peripheral surface. Then, the rotation amount of the supply arm 31 and the retreat amount of the tool rest 39 are set on the basis of the detected maximum turning radius of the raw wood 5, and the raw wood 5 is supplied to the veneer race 29 to efficiently perform the cutting work. it can. In the above description, the contact type image sensor 25, in which a large number of light receiving elements are arranged at a required pitch in the direction orthogonal to the axis of the spindle 17, is attached corresponding to parallel light rays. As above the contact type image sensor 25
May be mounted so that a large number of light receiving elements are located substantially orthogonal to the axis of the spindle 17 and slightly offset in the circumferential direction of the log 5. By arranging the contact image sensors 25 in this way, the detection resolution of the contact image sensors 25 arranged at a required pitch can be further increased. Further, when the raw wood 5 supplied to the supply arm 31 is moved to the veneer race 29 side during cutting of the raw wood 5 by the veneer race 29, the diameter of the raw wood currently being cut and the raw wood 5 including the protruding portion 5a to be moved are The amount of rotation of the supply arm 31 with respect to the veneerless 29 side is calculated based on the maximum turning radius, and the raw wood 5 supplied to the outer peripheral surface of the raw wood being cut is moved to a position as close as possible to the position. However, the supply arm is based on the amount of movement of the tool post 39 as the cutting progresses.
The configuration may be such that 31 is gradually rotated from the position to the veneer race 29 side, and the raw wood 5 supplied to the outer peripheral surface of the raw wood being cut is always kept in a standby state as close as possible. In this case, the supply time of the raw wood 5 to the veneer lace 29 can be shortened and the cutting work can be made efficient. Further, the raw wood 5 centered by the rotation of the centering arms 15a, 15b, and 15c is held by the supply arm 31 at the centering device 7 and kept waiting, and the raw wood 5 already being cut by the veneer 29. It is also possible to feed the raw wood 5 to the veneer race 29 by rotating the supply arm 31 after the spindle 37 is retracted to remove the core after the cutting of FIG. In the above description, prior to feeding the cut raw wood 5 to the veneer lace 29, the raw wood 5 is centered and the cross section in the direction orthogonal to the axis line including the wood mouth surface by the raw wood diameter detection device 9 has a non-round shape. After detecting the maximum turning radius of the raw wood 5 having the protruding portion 5a on the outer peripheral surface, the amount of rotation of the supply arm 31 with respect to the veneer race 29 side and the tool rest 39 with respect to the spindle 37 of the veneer race 29 are detected based on the maximum turning radius. Although the amount of movement is set and the device is on standby, another embodiment may be configured as follows. That is, as shown in FIG. 10, the raw wood diameter detecting device 91 is attached to each spindle 37 side of the veneer race 29, and after the centering by the centering device 7 shown in the embodiment, the supply arm
The raw wood 5 supplied to the veneer race 29 side with the rotation of 31 and chucked by the spindle 37 is rotated at least once before the cutting. Then, as the raw wood 5 rotates, the raw wood diameter detecting device 91 detects the maximum turning radius of the raw wood 5 including the protruding portion 5a, and the movement amount of the tool rest 39 with respect to the spindle 37 side based on the detected maximum turning radius. May be configured to set. The laser irradiation device 21, the optical lens 23, and the contact image sensor 25, which constitute the raw wood diameter detection device 91, are the same as those in the above-mentioned embodiment, and the description thereof will be given with the same reference numerals as those in the embodiment. Is omitted. Further, the other CPU, ROM, RAM, log drive circuit, electric motor, etc. are configured corresponding to the above embodiment. When the log 5 is supplied to the veneer lace 29 with the above configuration, the tool rest 39 is attached to the spindle 37 as shown by the broken line in FIG.
It is made to stand by at a position retracted in advance (in a direction away from the spindle 37) at a distance equal to or larger than the maximum turning radius expected in a large number of logs to be cut from the axis center of. Next, the raw wood 5 supplied in the above state is spindle 37 at its core position.
After being chucked by, the raw wood 5 is rotated at least once as the spindle 37 is driven. Then, when light parallel to the axis of the rotating raw wood 5 is irradiated from one side of the mouth toward the other side of the tree, the cross section of the irradiated light in the direction orthogonal to the axis including the side of the mouth has a non-round shape. Alternatively, the light is blocked according to the maximum turning radius of the raw wood 5 having the protruding portion 5a on the outer peripheral surface. As a result, the maximum turning radius of the raw wood 5 is detected based on the electric signal output from the light receiving element shielded in accordance with the maximum turning radius of the raw wood 5 among the light receiving elements of the contact image sensor 25. After the detection of the maximum turning radius, the veneer race control device, based on the input raw log diameter data regarding the maximum turning radius, the tool post 39 as shown by the solid line in FIG. 11, the raw wood detected from the standby position. The tool post 39 is rapidly advanced to a position on the spindle 37 side according to the maximum turning radius, and the tool rest 39 is moved with respect to the maximum outer circumference of the log 5 including the protruding portion 5a by an amount of advance according to the thickness of the veneer to be cut. While cutting, the rotating raw wood 5 is cut. This allows the tool post 39 to be moved from the axis of the spindle 37 in advance.
Of the many logs 5 to be cut at a position separated by a distance equal to or larger than the expected maximum radius of gyration, and then visually confirmed the state of proximity to the maximum outer circumference of the next log 5 to be rotated. However, compared with the conventional cutting method in which the raw wood 5 is cut after the turret 39 is rapidly advanced, the turret 39 is surely brought close to the maximum outer circumference of the raw wood including the protruding portion 5a, and the cutting is immediately performed. The loss can be reduced to improve the cutting efficiency, and the tool post 39 can be reliably prevented from being damaged when the tool post 39 is excessively advanced, so that the maintenance and management of the device can be facilitated.

【The invention's effect】

For this reason, the present invention is capable of accurately and quickly measuring the maximum turning radius of a raw tree having a non-circular cross section in the direction orthogonal to the axis including the mouthpiece surface or having a protruding portion on the outer peripheral surface with a simple configuration. it can.

[Brief description of drawings]

FIG. 1 is a schematic front view showing the outline of a centering and feeding device equipped with a raw wood diameter detection device according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is an arrangement of the raw wood diameter detection device. FIG. 4 is an explanatory diagram showing a state, FIG. 4 is a block diagram showing an outline of control, FIGS. 5 to 8 are explanatory diagrams showing an operation, and FIGS. 9 to 11 are explanatory diagrams showing a modified example of the present invention. . In the figure, 5 is a log, 9 is a log diameter detecting device, 17 is a spindle which constitutes a part of the log rotating member, 19 is an electric motor which constitutes a log rotating member, 21 is a laser irradiation device as a light source, 23 Is an optical lens, 25 is a contact type image sensor as a light receiving device, 51 is a CPU as a control device, and R ^{1 to} R ⁿ are light receiving elements.

Claims (3)

(57) [Claims] 1. A log rotation member for rotating the log at least once around a constant axis parallel to the fiber, and between the position on the one axis side of the log of the log and the position beyond the outer circumference. A light source that irradiates light parallel to the axis toward the other wood mouth side of the raw wood, and a light receiving member in which a large number of light receiving elements are arranged facing the light emitted from the light source on the other wood mouth side of the raw wood, Control means for measuring the distance from the axis to the outermost circumference of the raw wood based on the light receiving element that is shielded by the raw wood rotating by the raw wood rotating member and transitions from the bright state to the dark state among the light receiving elements in the light receiving member, A raw wood diameter detection device characterized by being provided. 2. The raw wood diameter detection device according to claim 1, wherein the light source is a laser irradiation device. 3. The raw wood diameter detection according to claim 1, wherein the light receiving member comprises a contact image sensor in which a large number of light receiving elements are arranged at a pitch according to the detection resolution. apparatus.