JPH0460001B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method and apparatus for determining the overall axis, which is the turning center of the raw wood, when rotary cutting the raw wood using a veneer lace. 3 in the longitudinal direction of the log, including the areas near both ends.
An arbitrary position above this point is used as the calculation standard for determining the coordinate value of the entire body axis of the log, and based on the calculation result obtained by rotating the gripping claws around the temporary center of the log as the rotation center, the retraction limit is determined. The forward correction amount on the x-axis and the downward correction amount on the y-axis of the positioned gripping claw are calculated to move the log.

``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 measure the lengths of the long and short axes that are perpendicular to each other by placing their index fingers on both ends of the wood, then calculate the median line of each long and short axis and mark it in chalk. The intersection point of the median line was found as the turning center.

Another method is to support the vicinity of both ends of the log by a pair of cradle that can be moved up and down and back and forth, and to project concentric circles onto the end faces of both ends of the log from a pair of projectors placed above. Based on
Adjustments were made by vertical movement of the pedestal on the y-axis of both butt ends 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 built into the external shape of both butt ends of the raw wood. .

Furthermore, 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 from above and below at equal distances to sandwich the log. I was also 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 when calculating the median line from the measured major and minor axes, errors inevitably occur, so accuracy must be ensured. Also, in the second method, the concentric circles projected onto the end surfaces of both 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 is designed to rotate the temporary center of the raw material as a rotation center by means of a gripping claw that waits at the retreat limit at the centering position of the raw material, and to rotate the raw material in the longitudinal direction. After detecting cross-sectional contours at multiple locations and calculating the coordinate values of the overall body axis, the amount of correction on the x-axis based on these coordinate values is calculated by the forward movement of the gripping claws, and the amount of correction on the y-axis is calculated based on the coordinate values. This is done by the downward movement of the conveying claws, then the raw wood is gripped and exchanged from the gripping claws to the conveying jaws, and then the raw wood is conveyed a fixed distance to the turning center of the veneer race.

"Embodiments" Hereinafter, embodiments 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 guide shafts 4 are installed facing each other between the machine frames 1 on both the left and right sides, and the pair of guide shafts 4
The perforated portions at both ends of the upper part of the bearing box 5 are inserted into the holes to support the bearing box 5. A gripping fluid cylinder 7 is attached to the rear part of the support 6 extending from the lower end of the bearing box 5, and the tip of the piston rod 8 is fitted into and supported by a spindle 9 in the approximate center of the bearing box 5. It is attached to the rear end of.

At the tip of this spindle 9, a gripping claw 12 for gripping the end face 11 of the raw wood 10 is attached, and near the center thereof, a chain 14 is attached that controls the rotation of a motor 13 installed at the lower part of the support 6. A chain wheel 15, which is driven by the chain wheel 15, is slidable in the axial direction and is integrally fitted in the rotating direction. At this time,
As shown in FIGS. 6 and 7, a driven-side spindle 9 that is fitted and supported by the other bearing box 5 located opposite to each other has a large gear 16 that is slidable in the axial direction and rotated in the rotational direction. This large gear 1
A small diameter linking gear 17 is meshed with the linking gear 17, and a small gear 18 is fitted onto the shaft of the linking gear 17.
and a log rotation angle detector 2 that measures the rotation angle of the log 10 at arbitrary angles by meshing the pinion 20 of the rotary encoder 19 attached to the support 6.
1 is placed.

Furthermore, an x-axis correction fluid cylinder 22 is attached to the center of the bearing box 5, and the tip of its piston rod 23 is attached to one of the machine frames 1, and is arranged parallel to the guide shaft 4. In easy 24,
An x-axis correction device 28 is arranged to mesh the pinion 26 of the encoder 25 attached to the support 6, reset the encoder 25 by the limit switch 27, and regulate the amount of movement of the bearing box 5 from the backward limit. ing.

On the other hand, a displacement detector 29 is installed on the cross beam 2 to detect an arbitrary cross-sectional contour in the longitudinal direction of the log 10.
are installed at a plurality of locations, in this embodiment three locations, one in the center and one at both ends.

That is, the vicinity of the base of the dogleg-shaped swinging arm 31 is pivotally supported by a pin 32 between a pair of side plates 30 attached to the side surfaces of the cross beam 2 in the direction in which the raw wood 10 is carried in, and
The rear part of the swinging arm 31 is pivoted to the displacement fluid cylinder 33, and the tip of the piston rod 34 is pivoted to the upper part of the pair of side plates 30, so that the tip of the swinging arm 31 is moved to the pin 32 by fluid movement. The contact portion is used as a fulcrum and is constantly pressed against the outer circumferential surface of the log 10. Further, the semicircular measuring plate 35 fitted to the contact portion of the pin 32 of the swinging arm 31 and the pinion 37 of the encoder 36 attached to the side plate 30 are brought into mesh with each other, and the swinging arm 3
The amount of rocking displacement of 1 is detected.

As shown in the illustrated example, the displacement detectors 29 located at both ends have side plates 30 attached to a pair of adjustment shafts 38 attached to the cross beam 2 so that the detection position can be moved freely according to the length of the log 10. The piston rod 40 of the adjusting fluid cylinder 39 is fitted and attached to the cross beam 2.
In some cases, the tip of the holder may be connected to the side plate 30.

Next, using the left and right horizontal beams 3 as rails, a traveling body 42 with wheels 41 supported at its four corners is horizontally suspended parallel to the cross beam 2, so that it can freely reciprocate up to the veneer race.

Hanging bodies 44 are fitted to opposite sides of horizontal shafts 43 arranged parallel to the cross beam 2 on both the left and right sides of the running body 42, and each hanging body 44 is provided with an opposite side at the bottom of the running body 42. The tips of the piston rods 46 of a pair of fluid cylinders 45 for the suspension body are attached,
Each hanging member 44 is movable along the horizontal axis 43.

Furthermore, a transport claw 48 is fitted into a pair of guide shafts 47 hanging from the lower end of each suspension member 44, and the rear end of the transport claw 48 is attached to the suspension member 44 in the opposite direction. It is attached to the piston rod 50 of the y-axis correction fluid cylinder 49, and the suspension body 44
The pinion 5 of the encoder 51 attached to the side of the
2 to the rack 53 attached to the side of the transport claw 48.
A y-axis correction device 54 is provided that meshes with the y-axis and regulates the amount of descent of the conveyance claw 48.

At this time, the y-axis correction fluid cylinder 49 restricts the conveying claw 48 from its upper limit position to two stages: a first-stage lowering T for y-axis correction and a second-stage lowering L after gripping the log 10. Therefore, in order to regulate the position after the second stage lowering L to either the middle stage or the lower stage depending on the size of the log diameter, the circumscribed piston rod 5 slides on the outer periphery of the piston rod 50 in the cylinder chamber.
It contains 5.

In order to restrict the two-stage lowering of the transport claw 48, a fluid cylinder (not shown) for the second stage lowering L is further suspended in series on the piston rod 50 of the y-axis correction fluid cylinder 49. , connects the rear end of the conveying claw 48 to the tip of the piston rod (not shown), and also is movable to mechanically restrict the first stage lowering T and second stage lowering L of the y-axis correction fluid cylinder 49. It is also possible to provide a stop (not shown).

In addition, 56 in the figure is a chuck of veneer lace.

"action" Next, the action will be explained.

First, when carrying the raw wood 10 to the centering position, the piston rod 8 of the gripping fluid cylinder 7 is contracted to retract the gripping claws 12 as shown in FIG. 1, and as shown in FIG. The piston rod 23 of the axis correction fluid cylinder 22 is contracted to make the bearing box 5 wait on the guide shaft 4 at the retraction limit, and the adjustment fluid cylinder 39 adjusts the swing arms at both ends according to the length of the log 10. After adjusting the position of the piston rod 31, the piston rod 34 of the displacement fluid cylinder 33 is extended, and the swing arm 31 is retracted to the upper limit position using the contact portion of the pin 32 as a fulcrum.

Next, the log 10, which has been temporarily centered according to the method described above, is transported to the centering position, and the pair of gripping fluid cylinders 7 is operated to align the temporary center of both end faces 11 and the gripping claws 12. Match the centers,
Grip the log 10.

Furthermore, by operating the displacement fluid cylinder 33, each swinging arm 31, which had been retracted to the upper limit, is moved to the pin 3.
It is pressed against the outer circumferential surface of the log 10 in the longitudinal direction using the two contact parts as a fulcrum with a constant pressure.

When the drive of the motor 13 is transmitted to the chain wheel 15 through the chain 14, the spindle 9 is rotated, and the log 10 is rotated once around the temporary center. At this time, log 10
The amount of rotation is determined by the log rotation angle detector 21, and each arbitrary cross section near both ends and the center of the log 10 is measured as the amount of displacement from the line connecting the tentative centers of both end faces 11 of the log 10. By the amount detector 29,
Each is detected synchronously.

That is, in the log rotation angle detector 21, the rotation angle of the spindle 9 on the driven side is sequentially detected by the rotary encoder 19 via the pinion 20, and on the other hand, in each displacement detector 29,
The radius and deviation angle from the rotation center axis for each arbitrary cross section are
This is taken as the amount of displacement of the swinging arm 31 that swings using the contact portion of the pin 32 as a fulcrum, and this amount of displacement is measured by the measurement plate 3.
Encoder 3 via pinion 37 meshing with encoder 5
6 has been successively detected.

Therefore, the electric signal of the arbitrary angle detected by the log rotation angle detector 21 and the electric signal of the displacement amount detected by the displacement amount detector 29 are extracted synchronously 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.
The coordinate values of the total body axis will be obtained. 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 x-axis correction device 2
8. Instruct each to the y-axis correction device 54.

Next, based on FIG. 10, correction of each deviation will be specifically explained. Suppose that the rotation center O is the coordinate origin (0,0), and the coordinate value of the total body axis G is (Gx,
-Gy), the correction amount on the x-axis is from the predetermined advance amount A of the bearing box 5, for example, the advance amount to the branch perpendicular line of the conveying claw 48 waiting at the upper limit position, to (Gx)
The amount of movement is obtained by subtracting . In addition, the correction amount on the y-axis is a predetermined descending amount B of the conveying claw 48, for example, a descent calculated by subtracting the radius of the chuck 56 + α from the distance from the lower end of the conveying claw 48 waiting at the upper limit position to the y-coordinate (0). The first stage descent T is obtained by subtracting (-Gy) from this amount.

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 5 on the x-axis is the predetermined advance amount A, and the y
The first stage lowering T of the conveyance claw 48 on the shaft becomes a predetermined lowering amount B.

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 22 of the axis correction device 28 to advance the bearing box 5 individually along the guide shaft 4, and the amount of advance sequentially detected by the encoder 25 is returned to the calculation device. , the amount of correction is accurately controlled.

Next, the y-axis correction devices 54 located on the left and right
The correction amount is transmitted to the axis correction fluid cylinder 49,
The conveying claws 48 are lowered along the guide shaft 47, and the lowering amounts successively detected by the encoder 51 are returned to the arithmetic unit to accurately control the correction amount.

After the correction is completed, the pair of suspension body fluid cylinders 45
is operated to cause the conveying claws 48 to bite into both end faces 11 of the log 10, and then the gripping claws 12 are released from both end faces 11 of the log. At this time, the raw wood 10 is held in a relatively centered state by the pair of transport claws 48 on the geometric coordinates of both end faces 11, and under this state, the y-axis correction fluid cylinder 49 The external piston rod 55 whose second stage lowering L is regulated is activated in the cylinder chamber.
until the piston part of the piston 50 comes into contact with the tip of the rod part.

Thus, the height of the axis gripped by the conveying claws 48 becomes the same as the turning center S of the chuck 56 of the veneer lace, and after that, the traveling body 42 is advanced by a fixed distance C on the horizontal beam 3, and the raw wood is 10 total body axis G
The turning center S is made to coincide with the turning center S, and the log 10 is gripped and converted by the chuck 56 from the conveyance claw 48.

Note that the second stage lowering L of the transport claw 48 and the traveling body 42
If the forward movement of a certain distance C is carried out at the same time, the time for supplying the logs 10 to the veneer lace can be shortened.

"Effects of the Invention" As described above, according to the present invention, the log is rotated about the temporary center by the gripping claws waiting at the retreat limit, and the cross-sectional contours at multiple locations in the longitudinal direction are detected. By doing so, the coordinates of the entire axis of the raw wood are calculated, and based on these coordinates, the gripping claws are first advanced to make corrections on the x-axis, and then the conveying claws are lowered to make corrections on the y-axis. After this, the raw wood is gripped and supported from the gripping claws to the conveying claws, so that an accurate center of lathe can be obtained, and for veneer veneers cut by veneer races, the center of lathe can be obtained by the various conventional methods described above. The acquisition rate of continuous veneer veneer is improved. In addition, the amount of discontinuous veneer veneer discharged is reduced, and workability in subsequent steps can be improved.

In particular, when making corrections, the bearing box is constantly regulated to move forward by subtracting the correction amount on the x-axis from the predetermined advance amount, and furthermore, the conveying claw is constantly regulated by subtracting the correction amount on the y-axis from the predetermined downward movement amount. The decline is regulated,
Since both are controlled in one direction, the control method and mechanism are simple.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view showing an embodiment of the present invention, Fig. 2 is a partially cutaway front view of the same, and Fig. 3 is a partially cutaway side view showing an embodiment of the present invention.
The front view of the axis correction device, Figure 4 is the same plan view, Figure 5 is the same side view, Figure 6 is the front view of the log rotation angle detector, Figure 7 is the same side view, and Figure 8 is the displacement amount. Figure 9 is a front view of the detector, and Figure 10 is a front view of the y-axis correction device.
The figure is a schematic explanatory diagram. 1...Machine frame, 5...Bearing box, 9...Spindle, 10
...Log, 12...Gripping claw, 21...Log rotation angle detector, 28...X-axis correction device, 29...Displacement amount detector,
31... Swinging arm, 42... Traveling body, 48... Conveying claw, 5
4...y-axis correction device.

Claims (1)

[Scope of Claims] 1. By rotating the raw wood around a temporary center using the gripping claws waiting at the retraction limit and detecting cross-sectional contours at multiple locations in the longitudinal direction, the entire raw wood can be grasped. The coordinate value of the axis center is calculated, and based on this coordinate value, the gripping claw is first advanced to perform correction on the X-axis, then the conveying claw is lowered to perform correction on the Y-axis, and then the log is A log centering method characterized by changing the grip from a gripping claw to a conveying claw. 2. A pair of bearing boxes, which are horizontally movable between vertically erected machine frames using an At the same time, the conveyor claws, which can be raised and lowered, are suspended from both sides by a Y-axis correction device on the traveling body, which is horizontally suspended using the horizontal beam at the top of the machine frame as a guide. down,
On the other hand, a displacement detector is attached to the base end of each swinging arm, which is arranged at arbitrary intervals in the longitudinal direction of the log, and is in contact with a pin, and the rotation angle detector and the displacement detector Based on the coordinate values of the overall axis axis calculated from each data, the forward correction amount of the bearing box is outputted to the X-axis correction device, and the downward correction amount of the conveyance claw is outputted to the Y-axis correction device. A device for centering raw wood.