JPS62151701A - Method and device for aligning material wood - Google Patents

Abstract

PURPOSE:To prevent material wood from being shaved into a veneer plate which is smaller in width than fixed size by detecting the contour of section of the material wood at plural lengthwise positions and correcting a temporary center based on the coordinate values of the axis of the whole body which are calculated from the detected contours. CONSTITUTION:The material wood 7 which is aligned temporarily is carried in to an alignment position and a hydraulic cylinder for clamping is put in operation to clamp the material wood 7 while temporary centers of both end are made coincident with the center of the clamping claw 9. Further, each swing arm 21 which is moved back to the upper limit is pressed against the external peripheral lengthwise surface of the material wood 7 under constant pressure. The material wood 7 is rotated around the temporary center as a center of rotation. At this time, the quantity of rotation of the material wood 7 is detected by a material wood rotational angle detector and respective optional cross sections at both ends and the center part are detected by a displacement quantity detectors synchronously as the quantities of displacement from the line connecting both ends of the material wood 7. Respective conveyance claws 47 which are positioned at both ends of a running body are corrected based on the coordinate values of the whole body axis G of the material wood 7 calculated from said detection results, and then the material wood 7 is replaced from the clamping claws 9 to the claws 47, which are further moved to the running body based on a correction quantity.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention is applicable to the following:
The present invention relates to a method and apparatus for determining the overall axis, which is the turning center of a log, and in particular, over the longitudinal direction of the log.
Three or more arbitrary positions, including the vicinity of both ends, are used as calculation standards to determine the overall axis of the raw wood, and based on the calculation results obtained by rotating the gripping claws around the tentative center of the raw wood, the conveying claw The correction amount is calculated and the log is moved.

``Prior art'' Generally, when determining the turning center of a veneer lace made of raw wood, the maximum inscribed circle that is common to the water-grain end faces of the raw wood cut to an appropriate length is calculated, and the center of this circle is determined. It is done by

Specifically, at each plywood factory, workers place a ruler on the edge of the log's rain hole and measure the lengths of the major and minor axes that intersect at right angles, then calculate the median line of each major and minor axis and mark it in chalk. , the intersection of the median lines was found and used as the turning center.

Another method is to support the vicinity of the rainwater grains of the raw wood with a pair of pedestals that can be raised and lowered and can move back and forth, and to project concentric circles onto the end surface of the rainwater grains of the logs from a pair of projectors placed above. Based on this, adjustments were made by vertical movement of the pedestal on the Y-axis of the rain-grained end surface of the raw wood, and by back-and-forth movement of the pedestal on the X-axis, and the turning center was set at the center of an arbitrary concentric circle inscribed in the outer shape of the rain-grained end surface. .

Furthermore, a method in which a pedestal on which the log is placed and a detector that detects the top surface of the log are placed opposite to each other near the end of the log's rainwater outlet, and the two are brought close to each other from above and below at equal distances to sandwich the log. , I was looking for a turning center.

"Problems to be Solved by the Invention" However, among the various methods described above, the first method independently sets the major and minor axes of the end faces of logs based on the subjectivity of the worker, and the measured When calculating the median line from the major and minor axes, errors inevitably occur and it is difficult to ensure accuracy.

In addition, in the second method as well, the concentric circle diagram projected onto the end face of the rainwater eye is an image from a projector separated by a certain distance, so the multiple concentric circles are in a widened state, and the end face contour by the operator and the arbitrary It becomes difficult to distinguish it from concentric circles.

Furthermore, in the third method, even if the amount of rise of the pedestal and the amount of fall of the detector are controlled to be equidistant, the cross section of each log is irregular, so the clamping state will be inaccurate.

In addition, each of the above methods uses both ends of the raw wood, or positions near them, as calculation criteria for determining the center of turning, so bending and deformation in the longitudinal direction of the raw wood are
In each case, the operator has to rely on his or her intuition,
Therefore, the error in the turning center is further increased. Therefore,
If you actually perform rotary cutting with veneer lace, you will end up cutting out a large amount of narrow veneer veneer that is less than the specified size.

"Means for Solving the Problems" In view of the above, the present invention detects cross-sectional contours at multiple locations in the longitudinal direction of the log by rotating the log gripped by gripping claws around a temporary center of rotation. Then, after correcting each transport claw located on both sides of the running body based on the coordinate value of the overall axis of the raw wood calculated from the detection results, the raw wood is gripped and exchanged from the gripping claw to the transport claw, and then this transport The claws are moved relative to the traveling body based on the amount of correction, and then the log is transported a fixed distance to the turning center of the veneer lace.

"Embodiments" Hereinafter, embodiments of the present invention will be described first from the configuration with reference to the accompanying drawings.

Place gravel at arbitrary intervals on the left and right, and set up the machine frame 1 vertically.
A cross beam 2 is horizontally hung between the upper parts of the machine frame 1 to form a gate shape, and a horizontal beam 3 is fixed and connected between the upper parts of the machine frame 1 extending in the longitudinal direction.

A pair of gripping fluid cylinders 4 are installed facing each other between the machine frames 1 on both the left and right sides, and the tip of the piston rod 5 is
A spindle 6 that is fitted and supported approximately in the center of the machine frame L.
It is attached to the rear end of the

At the tip of this spindle 6, a gripping claw 9 for gripping the end face 8 of the log 7 is attached, and a cheno wheel 12 receives the rotation of a motor 10 installed in the machine frame l via a chino wheel 11. is slidable in the axial direction and is fitted integrally in the rotational direction. At this time, as shown in FIGS. 6 and 7, a large gear 13 is fitted into the driven spindle 6 located opposite to each other so as to be slidable in the axial direction and integrally with respect to the rotational direction. A small-diameter linkage gear 14 is meshed with this large gear 13, and a small gear 15 fitted on the shaft of this linkage gear 14 and a pinion 17 of a rotary encoder I6 attached to the machine frame 1 are meshed with each other. In addition, a log rotation angle detector 18 is arranged to measure the rotation angle of the log 7 at arbitrary angles.

On the other hand, on the cross beam 2, displacement detectors 19 for detecting arbitrary cross-sectional contours in the longitudinal direction of the raw wood 7 are installed at a plurality of locations, in this embodiment, at three locations at the center and at both ends.

That is, the vicinity of the base of the swing arm 21 is supported by a pin 22 between a pair of side plates 20 attached to the side surfaces of the cross beam 2 in the direction in which the raw wood 7 is carried in, and a displacement fluid cylinder is attached to the front part of the cross beam 2. At the same time, the tip of the piston rod 24 is held on the swinging arm 21, and the tip of the swinging arm 21 is constantly pressed against the outer circumferential surface of the log 7 using the contact portion of the bin 22 as a fulcrum by fluid motion. I'm letting you do it. Furthermore, the semicircular measuring plate 25 fitted to the contact portion of the pin 22 of the swinging arm 21 and the pinion 27 of the encoder 26 attached to the side plate 20 are brought into mesh with each other, and the swinging displacement of the swinging arm 21 is adjusted. Detecting the amount.

In addition, as shown in the illustrated example, the displacement detectors 19 located at both ends have side plates 20 attached to a pair of adjustment shafts 28 attached to the cross beam 2 so that the detection position can be moved freely according to the length of the log 7. The tip of the piston rod 30 of the adjusting fluid cylinder 29 attached to the cross beam 2 may be connected to the side plate 20 by fitting.

Next, using the left and right horizontal beams 3 as rails, a traveling body 32 with wheels 31 supported at its four corners is horizontally suspended parallel to the cross beams 2, so that it can freely reciprocate up to the veneer race 33.

Hanging bodies 35 are fitted on the left and right sides of the traveling body 32 so as to face each other on horizontal shafts 34 arranged parallel to the cross beam 2. The piston rods 37 of a pair of suspension fluid cylinders 36 are supported in the same direction.
The tips of the suspension members 35 are attached to each other so that each suspension member 35 is movable along the horizontal axis 34.

Furthermore, a pair of vertical sliding shafts 38 are attached to both sides of the opposing surfaces of each suspension body 35, and the piston rod 40 of the X-axis correction fluid cylinder 39 supported on the back surface of each suspension body 35 is attached. The tip end is attached to an adjusting plate 41 fitted into the vertical sliding shaft 38, and the adjusting plate 41 is moved up and down in balance along the vertical sliding shaft 38, and a piston is attached to the X-axis correction fluid cylinder 39. An encoder 42 that detects the amount of movement of the rod 40 is attached, and an X-axis correction device 43 that regulates the amount of descent of the adjustment plate 41 is provided.

Further, a pair of horizontal sliding shafts 44 are attached to the upper and lower parts of the adjustment plate 41, and an X-axis correction fluid cylinder 45 is attached to the center thereof, and the tip of the piston rod 46 is connected to the pair of horizontal sliding shafts 44. It is attached to the conveying claw 47 fitted into the sliding shaft 44 to regulate the balance of the conveying claw 47 along the horizontal sliding shaft 44, and also allows the movement of the piston rod 46 to the X-axis correction fluid cylinder 45. An encoder 48 that detects the amount is attached, and an X-axis correction device 49 that regulates the amount of advance and retreat of the conveyance claw 47 is provided.

Note that the X-axis correction fluid cylinder 39 is regulated to move the adjustment plate 41 from its upper limit position to two stages: a first-stage downward movement T for Y-axis correction, and a second-stage downward movement after gripping the raw wood 7. . Therefore, in order to regulate the position after the second step descends to either the middle step or the lower step depending on the size of the diameter of the log 7, a circumscribed piston rod 50 that slides on the outer periphery of the piston rod 40 in the cylinder chamber is included. ing.

In addition, in order to restrict the second stage descent of this conveying claw 47,
To the piston rod 40 of the X-axis correction fluid cylinder 39,
A second stage descending fluid cylinder (not shown) is suspended in series, and the rear end of the conveying claw 48 is connected to the tip of the piston rod (not shown). It is also possible to provide a movable stopper (not shown) that mechanically restricts the first-stage lowering T and second-stage lowering of the cylinder 39.

In addition, numeral 51 in the figure is a chuck for the veneer lace 33.

"action" Next, the effect will be explained.

First, when carrying the log 7 to the centering position, the piston rod 5 of the gripping fluid cylinder 4 is contracted, the gripping claws 9 are retracted as shown in FIG. , the piston rod 40 of the X-axis correction fluid cylinder 39 is reduced, the adjustment plate 41 is placed on standby at the upper limit position along the vertical sliding shaft 38, and the piston rod 46 of the X-axis correction fluid cylinder 45 is extended. Then, the transport claw 47 is placed on standby at the backward limit position along the horizontal sliding shaft 44.

In addition, after adjusting the position of the swinging arms 21 at both ends using the adjustment fluid cylinder z9 according to the length of the raw wood 7 to be carried in,
The piston rod 24 of the displacement fluid cylinder 23 is extended, and the swing arm 2I is retracted to the upper limit position using the contact portion of the pin 22 as a fulcrum.

Next, the log 7 that has been tentatively centered is carried into the centering position, the gripping fluid cylinder 4 is operated, and the end face 8 of the rainwater eye is moved.
The log 7 is gripped by aligning the temporary center of the handle with the center of the gripping claw 9.

Furthermore, the displacement fluid cylinder 23 is operated to press each swinging arm 21, which had been retracted to the upper limit, against the longitudinal outer circumferential surface of the log 7 using the contact portion of the bin 22 as a fulcrum with a constant pressure.

When the drive of the motor IO is transmitted to the chain wheel 12 via the chain 11, the spindle 6 is rotated, and the log 7 is rotated once around the temporary center. At this time, the amount of rotation of the log 70 is detected by the log rotation angle detector 18.
In addition, arbitrary cross sections near both ends and the center of the log 70 are detected synchronously by the displacement detectors 19 as displacements from the line connecting the rainwater outlet end surfaces of the log 7.

That is, in the log rotation angle detector 18, the rotation angle of the spindle 6 on the driven side is sequentially detected by the rotary encoder 16 via the pinion 17, and on the other hand, in each displacement detector 19, the rotation angle of the spindle 6 on the driven side is detected sequentially. The radius and deflection angle from the center axis of each rotation are captured using the contact portion of the pin 22 as a fulcrum, and the amount of displacement is sequentially detected by the encoder 26 via the pinion 27 that meshes with the measurement plate 25.

Therefore, the electrical signal of the arbitrary angle detected by the log rotation angle detector 18 and the electrical signal of the amount of displacement detected by the displacement amount detector 19 are taken out synchronously, and a plurality of cross-sectional contours are detected. . Each of these cross-sectional contours is calculated by the calculation unit (
(not shown) and performs appropriate calculations based on each data to obtain the coordinate values of the entire body axis of the log 7.

Furthermore, this coordinate value and the temporary center, that is, the X from the rotation center
The deviations of the axes and the Y-axis are determined and instructed to the X-axis correction device 49 and the X-axis correction device 43, respectively.

Next, based on FIG. 9, correction of each deviation will be specifically explained. Let us assume that the rotation center 0 is the coordinate origin (0,0),
If the coordinate values of the overall axis G are (GX, -GV), then the correction amount on the The amount of movement is obtained by subtracting (GX) from the midpoint of the distance traveled, that is, the center position of the adjustment plate 41.

In addition, the correction amount on the Y axis is the adjustment plate 41, that is, the predetermined lowering ff1B of the transport claw 47 (for example, when the adjustment plate 41 waits at the upper limit position on the vertical sliding shaft 38, the lower end of the transport claw 47 Therefore, the moving amount is obtained by subtracting (-GV) from the descending amount, which is the distance to the origin on the Y coordinate minus a slight margin for the radius of the chuck 51, and this is the first stage descending T. .

Therefore, if the coordinate value of the overall axis G is (0, O), that is, the same as the rotation center 0, the amount of movement on the X axis (the amount that the conveying claw 47 moves on the horizontal sliding shaft 44) is: Predetermined advance fa
A, and the amount of correction on the Y axis (the amount by which the adjustment plate 41 moves on the vertical sliding shaft 38) is a predetermined decrease fltB.

The calculated correction amount is calculated by the X-axis correction devices 49 located on the left and right.
is transmitted to the X-axis correction fluid cylinder 45 of
is advanced along the horizontal sliding shaft 44 on the left and right sides, and
The amount of advance sequentially detected by the encoder 48 is fed back to the arithmetic unit to accurately control the amount of correction.

In synchronization with this, Y @II correction device 4 located on the left and right
The correction amount is transmitted to the X-axis correction fluid cylinder 39 of No. 3,
The adjustment plate 41 (M transparent type 47) is lowered along the vertical sliding shaft 38 on the left and right sides, and the amount of descent successively detected by the encoder 42 is fed back to the arithmetic unit to accurately control the amount of correction.

Next, the pair of suspension fluid cylinders 36 are operated to cause the conveyance claws 47 to bite into the rainwater outlet end face 8 of the log 7, and then the gripping claws 9 are removed from the rainwater outlet end face 8. After the grip is exchanged, the X-axis correction fluid cylinder 45 is operated to slide the conveying claw 47 on the horizontal sliding shaft 44 to the forward limit position, and the X-axis correction fluid cylinder 39 is operated to move the conveyor claw 47 in the cylinder chamber. In the second step, the log 7 is moved in accordance with the correction by being lowered until the piston portion of the piston rod 40 comes into contact with the tip of the lot portion of the circumscribed piston rod 50 whose descent is restricted.

At this time, the raw wood 7 is held in a relatively centered state by the pair of transport claws 47 on the geometric coordinates of the rainwater outlet end surface 8.

Therefore, the height of the axis gripped by the conveying claws 47 becomes the same as the turning center S of the chuck 51 of the veneer race 33, and after that, the traveling body 32 is advanced by a fixed distance C on the horizontal beam 3, Align the overall axis G of the log 7 with the turning center S,
The log 7 is gripped and replaced by the chuck 51 from the transport claw 47.

Incidentally, if the second stage lowering of the conveyance claw 47 and the forward movement of the traveling body 32 by a fixed distance C are carried out at the same time, the time for supplying the raw wood 7 to the chuck 51 of the veneer race 33 can be shortened.

Further, in this embodiment, for convenience, the X-axis correction device 43
is an X-axis correction fluid cylinder 39 on the back of each suspension body 35.
The adjustment plate 41 is moved up and down in equilibrium along the vertical sliding shaft 38, and the X-axis correction device 49 is configured by attaching the X-axis correction fluid cylinder 45 to the adjustment plate 41 and moving the conveying claw 47. Although the balance is regulated along the lateral sliding axis 44, the X-axis correction device 49
The X-axis correction device 43 is attached to the adjustment plate 4 on the back of each suspension body 35.
It is also possible to change the installation to 1.

Furthermore, in this embodiment, the starting point of the correction amount on the X axis of the conveying claw 47 is the backward limit, and the end point is the forward limit, but this end point may be set as the backward limit again, or the starting point is the forward limit, Changes such as setting the end point as the retreat limit are optional.

"Effects" As described above, according to the present invention, by rotating the raw wood gripped by the gripping claws around a temporary center of rotation, the cross-sectional contours of multiple locations in the long direction are detected, and from the detection results. After correcting each transport claw located on both sides of the running body based on the calculated coordinate values of the entire axis of the log, the log is gripped and exchanged from the gripping claw to the transport claw, and then the transport claw is adjusted to the correction amount. Since the raw wood is moved relative to the traveling body based on the veneer race and then transported a fixed distance to the turning center of the veneer race, an accurate turning center is automatically obtained. The yield rate of continuous veneer veneers is improved compared to those obtained by various conventional methods. In addition, the amount of discontinuous veneer veneer discharged is reduced, and workability in subsequent steps can be improved.

In addition, the correction based on the coordinate value of the entire axis of the raw wood can be performed by a single transport claw, and the movement of the raw wood based on the correction amount is
In particular, since it is regulated by the mechanical limit position of the conveyor claw,
This is not only effective in controlling heavy objects such as logs, but also reduces the time required.

[Brief explanation of drawings]

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 2 is a plan view showing an embodiment of the present invention.
3 is a partially cutaway front view of FIG. 1, FIG. 4 is a view taken along line A-A in FIG. 3, and FIG. 5 is a B--
B-line arrow view, Figure 6 is the front view of the log rotation angle detector, Figure 7 is the front view of the log rotation angle detector.
The figure is a side view of Figure 6, Figure 8 is a front view of the displacement detector,
FIG. 9 is a schematic explanatory diagram of the operation. 1...Machine frame, 3...Horizontal beam, 6...Spindle, 7...Log, 9...Gripping claw,
I8... Log rotation angle detector, I9... Displacement amount detector, 21... Rocking arm, 32... Traveling body, 3
5... Hanging body, 41... Adjustment plate, 113.
...Y-axis correction device, 47...conveyance claw, 49.
...X-axis correction device patent applicant Taihei Seisakusho Co., Ltd.

Claims (1)

[Claims] 1. By rotating the raw wood gripped by the gripping claws around a temporary center of rotation, the cross-sectional contours of multiple locations in the longitudinal direction are detected, and the raw wood calculated from the detection results is After correcting each transport claw located on both sides of the traveling body based on the coordinate value of the overall body axis, the log is gripped and exchanged from the gripping claw to the transport claw, and then the transport claw is moved to the traveling body based on the correction amount. A method for centering logs, which is characterized by moving the logs. 2. The method for centering logs according to claim 1, wherein the standby position before correction of the conveyance claw is at the backward limit and the upward limit position with respect to the traveling body. 3. The method for centering logs as set forth in claim 1, wherein the standby position of the transport claw before correction is the forward limit and ascent limit position with respect to the traveling body. 4. The method for centering logs according to claim 1, wherein the movement position based on the correction of the conveying claw relative to the traveling body is the backward limit and the lower limit position. 5. The method for centering logs according to claim 1, wherein the moving position based on the correction of the conveyance claw relative to the traveling body is the forward limit position and the downward limit position. 6. Grip claws are attached to the tips of the spindles, which are arranged in pairs on the left and right and can move forward and backward in the horizontal direction, and a rotation angle detector is attached near the base end. Meanwhile, the spindles run using the horizontal beam at the top of the machine frame as a guide. Conveyance claws, which can move forward and backward by an X-axis correction device and can be raised and lowered by a Y-axis correction device, are suspended from both sides of a freely horizontally suspended traveling body, and a plurality of conveyor claws are placed at arbitrary intervals in the longitudinal direction of the raw wood. A displacement detector is attached to the base end of each individually arranged swinging arm and pivotally fixed, and the coordinate value of the total body axis is calculated from each data of the rotation angle detector and the displacement detector. A log centering device characterized in that, based on the above, a correction amount is output to an X-axis correction device of the transport claw, and a downward correction amount is output to a Y-axis correction device.