JPH0420004Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" The present invention relates to a gripping tool used in a device for determining the chuck center, which is the center of rotation of the raw wood, when rotary cutting the raw wood with a veneer lace. It is something.

``Prior art'' Generally, to determine the chuck center of 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 being done.

Specifically, the vicinity of both ends of the log are supported by a pair of V-shaped pedestals that can be moved up and down and back and forth, and light is projected onto the end surface of the log from a pair of projectors placed above. Based on the concentric circles, the pedestal moves up and down on the Y-axis of both end faces of the raw wood.
On the X-axis, centering is performed by adjusting the back and forth movement of the pedestal, and then a pair of conveyor claws grips both ends of the raw wood and conveys it parallel or oscillatingly to the chuck center of the veneer lace. Ta.

However, the maximum inscribed circle is artificially determined based on the concentric circles projected onto the irregularly shaped butt end surface, and the core of the log is artificially determined by taking into account the curvature that exists in the longitudinal direction of the log. This lacks accuracy, and 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.

For this purpose, we have eliminated the above-mentioned manual work, and in recent years, we have detected arbitrary cross-sections at multiple locations in the longitudinal direction of the log while holding both end faces of the log and rotating them. Based on each detected data, we have been able to determine the maximum right cylinder of the log. A method of obtaining the axial center is adopted, and the position of the log after calculation is corrected as appropriate for centering, and as described above, after gripping the pair of conveyor claws on both end faces of the wood, the log is released from its grip. This improves the centering accuracy and allows the veneer lace to be conveyed in parallel or in an oscillating manner to the chuck center.

Therefore, the gripping claws that clamp the log and move it at least once, and the conveyance claws that transport the log in parallel or in an oscillating manner, are both located on both end faces of the log. It is not possible to make the nail small in diameter.

However, when the central part of both end faces of a log is held and rotated with small-diameter gripping claws, a large-diameter log, a log with irregularly shaped both end faces, and cracks, especially near the core, can occur on the end faces. For logs with weak parts, the rotation torque required for the log cannot be resisted, and the wood structure in the gripping area is destroyed, and the log becomes unable to rotate due to the gripping claws, making it difficult to perform this kind of centering work. It was considered impossible.

``Problems to be solved by the invention'' In view of the above, the present invention is designed to avoid mutual interference with the conveying claws that are synchronously interposed on both end faces of the raw wood, and has a simple structure. The present invention provides a gripping tool for rotating logs that can expand the gripping area on both wood end faces and resist rotational torque.

"Embodiments" Hereinafter, embodiments of the present invention will be described based on the accompanying drawings.

A plurality of claws 5 are planted on the surface 2 of the disc-shaped base 1, that is, on the side facing both butt ends 4 of the log 3, and a notch 6 is provided by removing a part of the base 1. Furthermore, the shaft portion of the spindle 7 is fitted into the center of this base body 1 from the back surface thereof, and a gripping tool 8 for rotating logs is fitted.
It consists of

On the other hand, as shown in FIGS. 3 and 4, a pair of left and right rails 10 are laid on the machine frame 9 above the centering position of the log 3, and on these rails 10 are mounted wheels supported at the four corners. 11, a running body 12 is installed which can run freely in parallel to a check center of a veneer lace (not shown). Further, logs 3 are attached to support shafts 13 arranged on the left and right sides of this running body 12.
A transport claw 14 is fitted and supported, which is slidable in the axial direction of the log and whose tip end can intervene in the notch 6 of the log rotation gripping tool 8.

It is also possible to move the conveying claws 14 from parallel conveyance by the traveling body 12 as described above to oscillating conveyance using the swing shaft 15 as a fulcrum to the chuck center of the veneer lace (not shown), as shown in FIG. It is.

Further, the shape of the notch 6 of the log rotation gripping tool 8 may be any shape, such as a rectangular shape, a fan shape, an arc shape, etc., as long as the conveyance claw 14 can intervene therein.

Therefore, by holding the log 3 on the pedestal using concentric circles based on the project method described above, or by bringing the pedestal and the detector close to each other at equal distances from above and below at the same time, the temporary center of the log 3 can be set. Calculate. Next, align the temporary center with the center of the spindle 7 shaft portion to both end faces 4 of the raw wood 3,
When the log rotation gripping tool 8 is pressed, the claws 5 grip the log 3 by biting into both butt ends 4 while the amount of biting is regulated by the surface 2 of the base 1.
After gripping, the rotation is transmitted to the spindle 7 and the log 3 is
move at least once.

As the log 3 rotates, as described above, the log 3
The axis of the log is determined by calculation, and the position of the log 3 is corrected as appropriate.

Next, the transport claw 14 is waiting outside the upper part.
is slid on the support shaft 13 or the swing shaft 15, and is inserted into both wood end faces 4 through the notch 6 of the log rotation gripping tool 8, and is gripped, while the spindle 7 is retracted. The log rotation gripping tool 8 is removed from both wood end faces 4.

When the claws 5 of the wood rotation gripping tool 8 are released from both wood end faces 4, the wood 3 is supported by the transport claws 14 and is transported in parallel or swinging to the chuck center of the veneer lace. If a part of the log rotation gripping tool 8 is interfering with the moving direction of the conveyance claw 14, the claw 5 shall be retracted to a position where it does not interfere.

That is, in the case shown in FIGS. 1 to 4, the right shoulder of the log rotation gripping tool 8 is connected to the conveying claw 14, and similarly, in the case shown in FIG.
The tip of the claw 5 is retracted by the thickness of the transport claw 14, and then the raw wood 3 is removed.
shall be transported. On the contrary, the log rotation gripping tool 8 shown in FIG.
When the logs 3 are separated from both wood end faces 4, the log 3 can be transported immediately.

Therefore, in order to shorten the conveyance time, the right shoulder portion of the log rotation gripping tool 8 shown in FIGS. 1 to 4 should be cut off and removed, and the one shown in FIG. The positional relationship between the log rotation gripping tool 8 and the conveying claw 14 is relatively reversed.

"Effect of the invention" As described above, according to the invention, a plurality of claws 5 are planted on the end surface 4 side of the log 3, and the transport claws 14
Since the log rotation gripping tool 8 is configured with a notch 6 that can be inserted, it is possible to prevent large-diameter logs 3, logs 3 with irregularly shaped end surfaces 4, and cracks or cracks on the end surfaces, especially near the core of the tree. Even in logs 3 etc. where weak parts exist,
It can grip not only the core of the tree but also the edge of the tree.
The gripping area is expanded compared to conventional small-diameter gripping tools,
It is capable of resisting a certain rotational torque.

Furthermore, the conveying claws 14 can intervene on both end faces 4 of the raw wood 3 through the notches 6 provided in the log rotation gripping tool 8, and do not interfere with each other.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of the device of the present invention;
Fig. 2 is a side view of the same, Fig. 3 is a front view showing the gripping state with the conveyance claw, Fig. 4 is a partially cutaway side view of Fig. 3, and Fig. 5 is another embodiment of Fig. 3. A front view showing
FIG. 6 is a front view showing another embodiment of FIG. 3. 1...Substrate, 2...Surface, 3...Log, 4...
Both wood end faces, 5...claw, 6...notch, 7...
Spindle, 8... Gripping tool for rotating logs, 14...
Transport claw.

Claims (1)

[Scope of utility model registration request] A gripping tool for rotating logs, characterized in that a plurality of claws are planted on the end face of the log, and a notch is provided in which the transport claws can intervene.