JPH0410001Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a veneer cutting device for cutting thin sheet-like veneers obtained by turning raw wood.

In recent years, as production lines have increased in speed, veneer cutting devices have tended to be of the so-called rotating blade type, in which the cutting blade rotates while cutting. Although these cutting devices do not cause any problems when cutting continuous long veneers in the form of a band, they do cause problems when cutting bulk veneers produced at the initial stage of turning raw wood whose outer circumferential surface is irregularly shaped. After cutting the leading edge of a particularly short piece of veneer, the broken, irregularly shaped scrap veneer clings to a rotating knife, lifts it up, and then falls, overlapping the subsequent product veneer in various configurations and bending it greatly. It may become impossible to feed the veneer in the next stage of the process, or it may interfere with normal veneer processing.

In order to eliminate these obstacles, there is a method to remove the waste veneer by injecting compressed air near the cutting blade, as shown in Japanese Patent Publication No. 53-10707 and Utility Model Publication No. 48-33113, but depending on the volume of the waste veneer, is not easily blown away,
However, large-capacity air injection is extremely uneconomical. The present invention eliminates the above-mentioned obstacles by using a simple device, and includes a swinging arm that rotates integrally with the cutting tool in front of the cutting tool in the rotational direction, and a swing arm that rotates integrally with the cutting tool in advance of the cutting tool. It is characterized in that a tension spring is stretched between the arms so that the tip of the arm can move in and out of the rotation locus drawn by the cutting edge of the cutter.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side view of the present invention. 1 is an incoming conveyor that is driven in the direction of arrow A. Reference numeral 3 denotes a holding conveyor placed above the carry-in conveyor, and both conveyors hold the veneer from above and below and convey it in the direction of arrow A.
Reference numeral 5 is an anvil roll whose outer peripheral surface is coated with an elastic material such as rubber, and is arranged with its upper surface aligned with the veneer conveyance surface of the carry-in conveyor 1, and is driven to rotate in the direction of arrow B.
Reference numeral 10 denotes a rotary cutter, which is arranged in parallel above the anvil roll 5, and in the illustrated embodiment, two cutters 11 are used.
It is a two-blade rotary cutter that is divided into upper and lower parts and installed opposite to the cutter body 13.

Reference numeral 13 denotes a cutter body with a shaft 15 attached to the center thereof, and the shaft 15 passes through the body and has shaft ends protruding left and right, and is mounted on a bearing (not shown) so that it can rotate integrally with the body in the direction of arrow C. be supported. As shown in the figure, the cutter body 13 is provided with symmetrical vertical surfaces extending in the axial direction above and below the center of rotation.
It forms the mounting surface of the The cutter 11 is slightly longer than the width of the veneer to be transported and is disposed perpendicular to the veneer transport direction, and when it reaches a vertical state by rotating in the direction of arrow C, its cutting edge touches or slightly touches the outer peripheral surface of the anvil roll 5. The cutter body 13 tightly holds the cutter body 13 with the cutting edge line aligned to the extent that the cutter body 13 bites.

The cutter body 13 includes a photocell (not shown),
In response to a cutting signal from a known veneer detector such as a limit switch, the blade 1 is rotated appropriately in the direction of arrow C via an intermittent drive mechanism such as an electromagnetic clutch or brake.
1 is configured to cut the veneer at required locations. The arc Q is a rotation locus drawn by the cutting edge of the cutting tool 11.

Reference numerals 21 and 21' designate rocking arms, which consist of an elongated, curved, arcuate distal end and a linearly extending distal end. A fulcrum shaft 24 is loosely inserted into the connection between the two, and the fulcrum shaft 24 is inserted in the front side in the direction of rotation of the cutter 11. It is held on the inclined surface of the cutter body 13 via a bracket 23 that pivotally supports a shaft 24, and is configured to be swingable in the direction of arrow D near the cutter 11.

Further, the swing arms 21, 21' are arranged at a plurality of locations along the blade 11 in the length direction (width direction of the veneer). Reference numeral 21' indicates a swinging arm disposed near the cutter 11 located on the lower side of the figure. 22, 22'
are relatively small-diameter rollers rotatably supported at the ends of the arms 21, 21'. Note that there is also an embodiment in which the rollers 22, 22' are omitted.

Reference numeral 25 is a spring that is tensioned between the end of the swinging arm and the cutter body 13. Therefore, in this state, like the swinging arm 21 above, the outer periphery of the tip roller 22 is pulled by the tension of the spring 25. is rotated in the direction of arrow C together with the cutter body 13 near the cutting edge of the cutter 11 and slightly protruding from the rotation locus Q drawn by the cutting edge.
Furthermore, when the tip of the swinging arm 21 swings toward the cutter 11 side against the spring 25, it moves inward from the rotation trajectory Q, like the bottom roller 22' of the swinging arm 21' disposed on the lower side of the figure. It turns out.

As above, the cutter body 13 equipped with the cutter 11
and a shaft 15, swinging arms 21, 21' held swingably by the cutter body 13, and a spring 25.
The rotary cutter 10 is constructed by the above.

Reference numeral 31 denotes an unloading conveyor, which is disposed on the veneer unloading side of the anvil roll 5 and is driven in the direction of arrow E. 36
The cut veneer is held between the upper surface of the carry-out conveyor 31 and the lower surface of the presser conveyor 36 by a presser conveyor and is conveyed in the direction of arrow E.

To explain the embodiment of the present invention with the above configuration, at the time of starting, the rotary cutter 10 has two blades 1
1 is stopped and waiting in a horizontal position forward and backward.
Next, the veneer is conveyed in the direction of arrow A by the conveyor 1, and when the cutting position of the veneer reaches near the vertical center line position of the anvil roll 5, a cutting signal is output from a known veneer detector and the rotary cutter 10 is activated. Rotate in direction C. Swinging arm 2 as the rotary cutter rotates
2 and 22' rotate as one unit, and when the arm approaches a vertical state, the lower end of the arm comes into contact with the surface of the veneer being transferred on the anvil roll 5, and the rotation trajectory of the cutter 11 changes. It will swing inward from Q.

Therefore, the tip of the swinging arm 21 continues to rotate while approaching the cutter 11 while pressing the veneer on the front side in the direction of rotation of the cutter against the anvil roll 5.
Finish cutting the veneer when it is vertical. In addition, the cut irregularly shaped waste veneer on the front side of the cutter does not cling to the cutter, but is held down by the tip of the swinging arm for a predetermined distance, gradually separating from the cutter and being transferred to the next stage delivery conveyor 31. .

On the other hand, the swinging arm 21 continues to rotate together with the cutter 11, etc., and the tip of the arm gradually separates from the pressed veneer, and swings in the direction of arrow D under the tension of the spring 25, following the rotational trajectory of the cutter. The rotary cutter 10 returns to a state slightly protruding from Q and continues to rotate, and stops when it reaches the initial standby position in preparation for the next cutting.
The same operation is repeated each time the motor rotates in the direction of arrow C.

As described above, the present invention uses a simple device to eliminate the hindrance caused by waste veneer on the front side of the cutting blade when cutting veneer, and by adopting a simple mechanism, the device itself is inexpensive, and also reduces fatigue due to repeated expansion and contraction of the spring. In some cases, it is a virtually maintenance-free device that requires only the replacement of the spring, reducing maintenance costs.Furthermore, operation can be resumed after a 5-minute interruption in spring replacement, resulting in various effects such as improved operating efficiency. It can be done.

[Brief explanation of the drawing]

FIG. 1 is a side view of an embodiment of the present invention. 5...Anvil roll, 10...Rotating cutter, 11...Knife, 13...Cutter body, 2
1, 21'... Swing arm, 25... Spring.

Claims (1)

[Claims for Utility Model Registration] 1. A veneer cutting device characterized in that a rotary cutter consisting of the following A, B, and C is arranged above an anvil roll driven in the veneer transport direction. A: A cutter body with the cutting edge facing outward, which can be rotated freely by the cutting signal. B. A swinging arm whose distal end is held on the cutter body via a bracket on the front side in the rotational direction of the cutter so that it can move forward and backward into and out of the rotation locus of the cutting edge near the cutting edge of the cutter. C. A spring stretched between the end of the swing arm and the cutter body. 2. The veneer cutting device according to claim 1, wherein the swing arm has a rotatable roller pivotally supported at its tip.