JPH0473363B2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention determines the overall axis, which is the turning center of the raw wood, when rotary cutting a raw wood using a veneer race, and automatically adjusts this to the veneer race. It relates to a feeding method and device, and in particular, after centering the raw wood to be carried in and detecting the temporary center, it is transported in parallel with the pedestal, and the raw wood is conveyed in the longitudinal direction, including the vicinity of both ends thereof. Three or more arbitrary positions are used as calculation standards to determine the coordinate values of the entire body axis of the log, and based on the calculation results obtained by rotating the gripping claws around the temporary center of the log,
The gripping claw waiting at the backward limit is moved forward by the correction amount on the x axis, and the conveying claw waiting at the upper limit position is moved forward by the amount of correction on the x axis.
The shaft is lowered by the amount of correction, and then the raw wood is advanced a certain distance to the veneer race to align the overall axis with the turning center.

``Prior art'' Generally, in order to determine the turning center of a veneer lace on a log, the maximum inscribed circle common to both end faces of the log 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 their index fingers on both end faces of raw wood, determine the lengths of the major and minor axes that intersect at right angles, and then calculate the median line of each major and minor axis and mark it in chalk. The intersection point of the median line was found as the turning center.

In addition, as another method, the vicinity of both ends of the log is supported by a pair of cradle that can be moved up and down and back and forth, and concentric circles are projected onto the end surfaces of both ends of the log from a pair of projectors placed above. Based on this, the center of an arbitrary concentric circle inscribed in the outer shape of both butt ends of the raw wood is adjusted by vertical movement of the pedestal on the y-axis of both end faces of the raw wood, and longitudinal movement of the pedestal on the x-axis. It was centered.

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 facing each other near both end faces of the log, and the two are brought close to each other at an equal distance from above and below to sandwich the log. , I was looking for a turning center.

However, among the various methods described above,
In the first method, the major and minor axes of the end face of the log are set independently based on the subjective opinion of the worker, and errors inevitably occur when calculating the median line from the measured major and minor axes, so accuracy must be ensured. Also, in the second method, the concentric circles projected onto both butt ends are images from a projector separated by a certain distance, so the multiple concentric circles are in a widened state, making it difficult for the operator to It becomes difficult to distinguish between the end face contour and arbitrary 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 the positions near them as calculation criteria for determining the center of turning, so bending or deformation in the longitudinal direction of the raw wood depends on the operator's intuition each time. Therefore, the error in the turning center is further increased. Therefore, when a veneer lace is actually rotary cut, a large amount of veneer veneer with a narrow width that is less than the specified size is cut out.

``Problems to be Solved by the Invention'' In view of the above, the present invention has been developed by placing logs carried from a carry-in conveyor to a temporary centering position by the upward movement of the pedestal, while The tentative center is determined by the upper surface detector that approaches the center, and then the pedestal is moved in parallel to the centering position, and the log is rotated around the tentative center by the gripping claws waiting at the retreat limit. After detecting the cross-sectional contours at multiple locations in the longitudinal direction and calculating the coordinate values of the overall axis, based on these coordinate values, the gripping claws are first advanced to perform correction on the x-axis, and then the conveying claws are moved forward. After lowering it and making corrections on the y-axis, the raw wood is gripped and exchanged from the gripping claws to the conveying jaws, and the conveying jaws are further advanced a certain distance to align the entire axis of the raw wood with the turning center of the veneer race. It is something.

"Example" Hereinafter, an example of the present invention will be described based on the accompanying drawings.

A plurality of pairs of machine frames 1 are erected in the vertical direction at arbitrary intervals left and right, and cross beams 2 are horizontally suspended between the upper parts of the machine frames 1 to form a gate shape, and extend in the longitudinal direction. Horizontal beams 3 are fixed and connected between the upper parts of the machine frame 1, respectively.

A pair of vertical guides 5, two in this embodiment, are attached at arbitrary intervals to the log 4 loading side of the cross beam 2. A plurality of chain wheels 6 are supported on the upper and side parts of the chain wheel 6, and both ends of a chain 7 suspended between these chain wheels 6 are fixed to an elevating body 8, and this elevating body 8 is rolled along the vertical guide 5. It is supported so that it can be raised and lowered using 9 as a guide. Further, a support rod 11 to which a lock nut 10 is attached is loosely inserted into the perforation at the tip of the elevating body 8, and an upper surface detector 12 is installed at the tip of the support rod 11.

On the other hand, the piston rods 15 of the fluid cylinders 14 for the lifting rails are installed on the sides of the machine frames 1 in opposite directions, with the lifting rails 13 horizontally suspended between the pair of machine frames 1 facing each other, located on both the left and right sides. The tip end is attached to a lifting rail 13, and the lifting rail 13 can be moved up and down along the machine frame 1 via guide rollers 16.

Further, a chain wheel 18 is connected to the chain wheel 6 supported on the cross beam 2 by the same shaft 17, and a chain wheel 19 is supported at vertically opposing positions, and these chain wheels 18, 19
A chain 20 suspended between them is fixed to the tip of the lifting rail 13, so that the upper surface detector 12 and the lifting rail 13 can be moved toward and away from each other at the same distance.

Furthermore, this elevating rail 13 is provided with a cradle 2 whose lower limit is below the surface of the carry-in conveyor 21 for carrying in the logs 4.
2 is provided, and this pedestal 22 is connected to a piston rod 24 of a pedestal fluid cylinder 23 installed on the lifting rail 13, and is movable in the horizontal direction.

Next, a pair of guide shafts 25 are installed facing each other between the machine frames 1 on both the left and right sides, and the perforated portions at both ends of the upper part of the bearing box 26 are inserted into the pair of guide shafts 25, and the bearing box 26 is inserted into the pair of guide shafts 25. It supports box 26. At the rear of the support body 27 extending from the lower end of the bearing box 26,
A gripping fluid cylinder 28 is attached, and the tip of its piston rod 29 is attached to the rear end of a spindle 30 which is fitted into and supported approximately at the center of the bearing box 26.

At the tip of this spindle 30, a gripping claw 32 for gripping the end face 31 of the raw wood 4 is attached, and near the center thereof, a chain 34 is attached that controls the rotation of a motor 33 disposed at the lower part of the support body 27. A chain wheel 35, which is driven by the chain wheel 35, is slidable in the axial direction and is integrally fitted in the rotating direction. At this time, a ninth
As shown in FIGS. 10 and 10, the large gear 36 is slidable in the axial direction and is fitted integrally in the rotational direction,
A small-diameter linking gear 37 is meshed with the large gear 36, and a small gear 38 fitted on the shaft of the linking gear 37 and a pinion 40 of a rotary encoder 39 attached to the support 27 are connected to each other. In addition, a log rotation angle detector 41 is arranged to measure the rotation angle of the log 4 at arbitrary angles.

Furthermore, an x-axis correction fluid cylinder 42 is attached to the center of the bearing box 26, and the tip of its piston rod 43 is attached to one of the machine frames 1, and is arranged parallel to the guide shaft 25. Rack 44
Then, the pinion 46 of the encoder 45 attached to the support body 27 is brought into mesh with the bearing box 26 from the backward limit.
An x-axis correction device 47 is arranged to regulate the movement of the beam.

On the other hand, a displacement beam detector 48 is installed on the cross beam 2 to detect an arbitrary cross-sectional contour in the longitudinal direction of the log 4.
However, they are installed at multiple locations, in this embodiment, at three locations near the center and both ends.

That is, between a pair of side plates 49 attached to the sides of the cross beam 2 in the direction in which the logs 4 are carried in, the vicinity of the base of the dogleg-shaped swinging arm 50 is pivoted by a pin 51, and the rear part of the swinging arm 50 is supported by a pin 51. The piston rod 53 is pivoted to the displacement fluid cylinder 52, and the tip of the piston rod 53 is pivoted to the upper part of the pair of side plates 49, and the tip of the swinging arm 50 is moved by fluid movement using the contact portion of the pin 51 as a fulcrum.
It is constantly pressed against the outer peripheral surface of the log 4. moreover,
A semicircular measuring plate 54 fitted to the contact portion of the pin 51 of the swinging arm 50 and a pinion 56 of the encoder 55 attached to the side plate 49 are brought into mesh to measure the swinging displacement of the swinging arm 50. Detected.

The displacement detectors 48 located at both ends are connected to a pair of adjustment shafts 5 attached to the cross beam 2 so that the detection position can be moved freely according to the length of the log 4, as shown in the illustrated example.
In some cases, the end of the piston rod 59 of the adjusting fluid cylinder 58 attached to the cross beam 2 is connected to the side plate 49 by fitting the side plate 49 into the side plate 7 .

Next, using the left and right horizontal beams 3 as rails, a traveling body 61 with wheels 60 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 62.

On both left and right sides of this running body 61, hanging bodies 64 are fitted and inserted oppositely to horizontal shafts 63 arranged parallel to the cross beam 2, and each hanging body 64 has a The tips of the piston rods 66 of a pair of suspension fluid cylinders 65 are attached to the
Each hanging member 64 is movable along the horizontal axis 63.

Further, a transport claw 68 is fitted into a pair of guide shafts 67 hanging from the lower end of each suspension member 64, and the rear end of the transport claw 68 is attached to the suspension member 64 in the opposite direction. It is attached to the piston rod 70 of the y-axis correction fluid cylinder 69, and the suspension body 64
The pinion 7 of the encoder 71 attached to the side of the
2 to the rack 73 attached to the side of the transport claw 68.
A y-axis correction device 74 is provided that meshes with the y-axis and regulates the amount of descent of the conveying claw 68.

At this time, the y-axis correction fluid cylinder 69 restricts the conveying claw 68 from its upper limit position to two stages: a first stage downward movement T for y-axis correction, and a second stage downward movement L after gripping the log 4. . Therefore, in order to restrict the position after the second stage lowering L to either the middle stage or the lower stage depending on the size of the diameter of the log 4, a piston rod 70 is slid on the outer circumference of the piston rod 70 in the cylinder chamber, as shown in FIGS. 15 and 16. A circumscribed piston rod 75 may be included therein.

In order to restrict this two-stage descent of the conveyance claw 68, a cylinder (not shown) is suspended in series to supply fluid for the second stage descent L to the piston rod 70 of the y-axis correction fluid cylinder 69. The rear end of the conveying claw 68 is connected to the tip of the piston rod (not shown), and the y-axis correction fluid cylinder 69 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 the second stage lowering L.

In addition, 76 in the figure is a chuck of the veneer lace 62.

"action" Next, the effect will be explained.

When the absence of the log 4 is confirmed at the temporary centering position, the piston rod 15 of the lifting rail fluid cylinder 14 is extended, and the upper surface detector 12 and the pedestal 22 are retracted to the open limit.

Under this condition, the raw wood 4 carried in by the carry-in conveyor 21 is temporarily stopped at the upper surface position of the pedestal 22, and the piston rod 15 of the fluid cylinder 14 for the lifting rail is contracted. Along with this contraction movement, the pedestal 22 rises via the lifting rail 13, and on the way up, it receives the raw wood 4 from the carry-in conveyor 21, but the amount of rise is in the direction of the arrow via the chain 20. Rotating chain wheel 18, chain wheel 6, chain 7
, the amount of synchronous descent to the elevating body 8 is converted, and the pedestal 22 and the upper surface detector 12 are brought close to each other at an equal distance.

Next, when the upper surface detector 12 first contacts the upper surface of the log 4, the amount of fluid supplied to and discharged from the lifting rail fluid cylinder 15 is adjusted to temporarily reduce the approaching speed. Therefore, the upper surface detector 12 is connected to the support rod 11.
until it ascends the perforated part of the elevating body 8 and is detected.
It is gradually pushed up by the log 4 to alleviate the impact when stopped and to improve the accuracy of temporary centering of the log 4.

At this time, the temporary center of the log 4 on the x-axis is set by the V-shaped inclined surface of the pedestal 22, and
2 and the pedestal 22, the temporary center on the y-axis is detected.

Next, if the log 4 brought in last time has already been centered and does not exist at the centering position,
The piston rod 24 of the fluid cylinder 23 for the pedestal is contracted, and the pedestal 22 is moved in parallel by a predetermined distance A on the elevating rail 13.

During this parallel transfer, the pair of gripping claws 32 are at the retracted position, the bearing box 26 is waiting at the retraction limit on the guide shaft 25, and the swinging arm 50 is moved in accordance with the length of the log 4. The positions of both ends have been adjusted. Therefore, the temporary center of the log 4 on the pedestal 22 and the center of the pair of gripping claws 32 are on the same line.

Next, the piston rods 29 of the pair of gripping fluid cylinders 28 are extended to grip both end faces 31 of the log 4 with the pair of gripping claws 32, and the displacement fluid cylinder 52 is operated to retract to the upper limit. Each of the swinging arms 50, which had been in use for a long time, is pressed against the outer peripheral surface of the log 4 in the longitudinal direction using the contact portion of the pin 51 as a fulcrum with a constant pressure.

In addition, in synchronization with this, the elevator rail 13 is returned to the lower limit position, and the pedestal 22 is returned to the backward limit position below the surface of the carry-in conveyor 21.

When the drive of the motor 33 is transmitted to the chain wheel 35 via the chain 34, the spindle 30 is rotated, and the log 4 is rotated once around the temporary center. At this time, the amount of rotation of the log 4 is detected by the log rotation angle detector 41, and the rotation amount of the log 4 is detected by the log rotation angle detector 41.
Arbitrary cross sections near both ends and the center of the log 4
The amount of displacement from the line connecting the tentative centers of both butt ends 31 is detected synchronously by each displacement amount detector 48.

That is, in the log rotation angle detector 41, the rotation angle of the spindle 30 on the driven side is sequentially detected by the rotary encoder 39 via the pinion 40, and on the other hand, in each displacement amount detector 48, each arbitrary A swinging arm 5 that swings the radius and declination from the rotation center axis for each cross section using the contact portion of the pin 51 as a fulcrum.
The displacement amount is regarded as zero, and this displacement amount is successively detected by the encoder 55 via the pinion 56 that meshes with the measurement plate 54.

Therefore, the electric signal of the arbitrary angle detected by the log rotation angle detector 41 and the electric signal of the displacement amount detected by the displacement amount detector 48 are synchronously extracted and Contours are detected. Each of these cross-sectional contours is input to a calculation device (not shown) and is appropriately calculated based on each data to obtain the coordinate value of the overall axis of the log 4. Furthermore, the deviations of the x-axis and y-axis from this coordinate value and the temporary center, that is, the rotation center, are determined, and the axis correction device 4
7. Instruct each to the y-axis correction device 74.

Next, correction of each deviation will be specifically explained based on FIGS. 13 to 16. For example, if the rotation center O is the coordinate origin (0, 0) and the coordinate value of the overall axis is (Gx, -Gy), then the correction amount on the x-axis is the predetermined advance amount B of the bearing box 26, For example, the amount of advance of the transport claw 68 waiting at the upper limit position to the branch perpendicular line,
The amount of movement is obtained by subtracting (Gx) from Also, y
The amount of correction on the axis is a predetermined lowering amount C of the transport claw 68, for example, from the distance from the lower end of the transport claw 68 waiting at the upper limit position to the y coordinate (0) to the chuck 7.
This is the amount of descent obtained by subtracting the radius +α of 6, that is, the grip margin D of the chuck 76, and (-Gy) is subtracted from this to obtain the first stage descent T.

Therefore, if the coordinate value of the overall axis G is (0, 0), that is, the same as the rotation center O, the amount of movement of the bearing box 26 on the x-axis is the predetermined advance amount B, and
The first stage lowering T of the conveying claw 68 on the y-axis is a predetermined lowering amount C.

The calculated correction amount is first calculated based on x located on the left and right.
It is transmitted to the x-axis correction fluid cylinder 42 of the axis correction device 47 to advance the bearing box 26 individually along the guide shaft 25, and the amount of advance sequentially detected by the encoder 45 is returned to the calculation device. , the amount of correction is accurately controlled.

Next, the y-axis correction devices 74 located on the left and right
The correction amount is transmitted to the axis correction fluid cylinder 69,
The conveying claws 68 are individually lowered along the guide shaft 67, and the lowering amounts successively detected by the encoder 71 are returned to the arithmetic unit to accurately control the correction amount.

After the correction is completed, the pair of suspension body fluid cylinders 65
is actuated to cause the conveying claws 68 to bite into both end faces 31 of the raw wood 4, and then to separate the gripping claws 32 from both end faces 31 of the logs 4. At this time, the raw wood 4 is held in a relatively centered state by the pair of conveyance claws 68 on the geometric coordinates of both end faces 31 of the ends.

Under this condition, the y-axis correction fluid cylinder 69 is operated, the piston rod 70 is extended, and the conveying claw 68 is lowered in the second stage L, thereby measuring the height of the overall axis of the log 4 held by the conveying claw 68. , is the same as the turning center S of the chuck 76 of the veneer race 62.

In FIG. 14, since the length of the y-axis correction fluid cylinder 69 is the same as the total distance of the first stage downward movement T and the second stage downward movement L, it is sufficient to limit the extension of the piston rod 70. In addition, if the y-axis correction fluid cylinder 69 includes the circumscribed piston rod 75, the gripping margin D is made variable according to the diameter of the log 4, and as shown in FIGS. 15 and 16, the circumscribed piston rod 75 The piston rod 70
The piston part of the piston comes into contact with the piston.

Therefore, the traveling body 61 is moved a certain distance E on the horizontal beam 3.
The log 4 is moved forward by a certain amount to align the overall axis G of the log 4 with the turning center S of the chuck 76, and the grip of the log 4 is exchanged between the transport claw 68 and the chuck 76.

Note that the second stage lowering L of the transport claw 68 and the traveling body 61
If the constant distance E advance is performed at the same time, the time for supplying the raw wood 4 to the veneer race 62 can be shortened.

``Effects of the Invention'' As described above, according to the present invention, at the temporary centering position, the pedestal on which the log is placed and the top surface detector that detects the top surface of the log are brought close to each other from above and below at equal distances to align the temporary center. Once detected, the pedestal with the original machine placed thereon is moved in parallel to the centering position, and with the temporary center as the rotation center, the log is rotated by the gripping claws waiting at the retraction limit to rotate multiple pieces of wood in the longitudinal direction. Detects the cross-sectional contour of each location, calculates the coordinates of the entire axis of the log,
Based on this coordinate value, first move the gripping claws forward and
After making corrections on the axis and then lowering the conveyance claws to make corrections on the y-axis, the log is gripped and exchanged from the gripping jaws to the conveyance jaws, and the conveyance jaws are further advanced a certain distance to collect the entire log. Since the shaft center is aligned with the turning center of the veneer race, the raw wood carried onto the conveyor is automatically centered to the veneer race, and the veneer single cut by the veneer race is Regarding boards, the yield of continuous veneer veneers is improved compared to those obtained by the various conventional methods described above. Furthermore, the amount of discontinuous veneer veneer discharged is reduced, and workability in subsequent steps can be improved.

In particular, the movement of the raw wood from the temporary centering position to the centering position and from the centering position to the veneer race is restricted to a certain forward distance, and when making corrections, the bearing box adjusts the amount of correction on the x-axis from the predetermined amount of advance. Subtract and
The forward movement is constantly regulated, and furthermore, the conveying claw is constantly regulated downward by subtracting the correction amount on the y-axis from the predetermined descending amount, resulting in a simple control method and mechanism.

[Brief explanation of drawings]

FIG. 1 is a schematic explanatory diagram of one embodiment of the present invention, and FIG.
The figure is a perspective explanatory view of the temporary centering part, Figure 3 is a partially cutaway front view of the temporary centering part, Figure 4 is a partially cutaway side view of the centering part, and Figure 5 is a partially cutaway view of the same part. Front view, Figure 6 is a front view of the x-axis correction device, Figure 7 is the same top view, Figure 8 is the same side view, Figure 9 is the front view of the log rotation angle detector, and Figure 10 is the same side view. 11 is a left side view of FIG. 3, FIG. 12 is a front view of the y-axis correction device, and FIGS. 13 to 16 are correction amount explanatory diagrams. 1...Machine frame, 2...Horizontal beam, 3...Horizontal beam, 4...
... Log, 12 ... Top surface detector, 13 ... Lifting rail, 21 ... Loading conveyor, 22 ... cradle, 26
... Bearing box, 32 ... Gripping claw, 41 ... Log rotation angle detector, 47 ...
8... Conveyance claw, 74... Y-axis correction device.

Claims (1)

[Scope of Claims] 1. At the temporary centering position, the pedestal on which the log is placed and the top surface detector that detects the top surface of the log are brought close to each other from above and below at equal distances to once detect the temporary center, and then the pedestal is The log is transported in parallel to the centering position with the log still placed, and the gripping claws waiting at the retraction limit rotate the log with the temporary center as the rotation center, detecting the cross-sectional contours at multiple locations in the longitudinal direction, and centering the log. After calculating the coordinate value of the overall axis of
A method for centering and supplying raw wood, characterized by exchanging the grip of the raw wood from the gripping claws to the conveying claws, and further advancing the conveying claws a fixed distance to align the entire axis of the raw wood with the turning center of the veneer lace. 2. A cross beam is installed horizontally in the horizontal direction between the machine frames installed in the vertical direction, and a top detector is suspended from the cross beam so that it can be raised and lowered, and a detector that can be raised and lowered along the machine frame and that is received above it is suspended. The elevating rails, on which the platforms are arranged to move back and forth, can be moved toward and away from each other at equal distances via a connecting body, and the interior of the machine frame, which is arranged side by side on the left and right, can be moved back and forth in the horizontal direction using an x-axis correction device. A spindle with a gripping claw attached to the tip and a rotation angle detector is slidably inserted into the pair of bearing boxes, and the horizontal beam at the top of the machine frame is used as a guide to set the spindle up to the veneer race. On a horizontally suspended traveling body that can travel freely over a distance,
Conveying claws that can be raised and lowered by a y-axis correction device are suspended from both sides, and on the other hand, a plurality of swinging arms are installed on the cross beam at arbitrary intervals in the longitudinal direction of the raw wood, and at the base end of each swinging arm is suspended. , displacement detectors are attached and pin-connected to each other, and further, based on the coordinate value of the overall body axis calculated from each data of the rotation angle detector and the displacement detector, the forward correction amount of the bearing box is set on the x-axis. to the correction device,
Further, a log centering and supplying device is characterized in that the downward correction amount of the conveying claws is outputted to a y-axis correction device.