JP2530438B2 - How to cut veneer veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION “Industrial field of application” The present invention is, in a veneer veneer manufacturing process, cutting veneer veneer cut by veneer lace to a standard length or an arbitrary width by a roll cut method. The present invention relates to a method for cutting veneer veneer.

"Prior art" Conventionally, when cutting veneer veneer, the veneer veneer is conveyed at a right angle to the fiber direction and is cut by a cutter attached to a receiving blade or a machine frame that moves up and down with respect to the anvil. A shear-cut method of cutting and a roll-cut method of cutting with a blade attached to a blade roller rotating in the opposite direction are adopted for the rotating anvil roll.

The former shear-cutting method is, for example, a veneer veneer with veneer lace, which is intermittently discharged at the beginning of the veneer veneer and has an uneven contour of the front and rear edges, and defective parts such as cracks, rots, and knots. This is particularly effective when cutting a veneer veneer to be cut into a finite width. However, when the veneer veneer is cut and separated by this shear cut method, a conveyor is installed to carry out the veneer veneer after cutting, close to the veneer veneer unloading side of the receiving blade. At this time, the support that supports the veneer veneer in front of the cutting line could not be installed, and the veneer veneer in the front position could not withstand the cutting force, and a crack occurred over the cutting line, ensuring reliable cutting separation. There are drawbacks that cannot be obtained.

The specified dimensions of veneer veneer that composes plywood, 3 shaku, 6
It can also be used to cut standard widths such as scales, or arbitrary widths such as 2, 3, 4, etc., but the blades that move up and down have an operating error and are carried in at high speed. It is difficult to cut a continuous veneer veneer into a proper size.

For this reason, the latter roll-cut method is mainly used in the above-mentioned standard length cutting. That is, as shown in FIG. 6, the blade roll 2 to which the blade 1 is attached has a circle corresponding to the cutting dimension of an arbitrarily set standard length (for example, 2 scales, 3 scales, 4 scales, etc.). A veneer veneer 3 having a circumference and having a fixed length (for example, 2, 3, 4, etc.) width is obtained along with one rotation of the blade roll 2, and usually one type of fixed length cutting is performed. It is something to do.

[Problems to be Solved by the Invention] However, in this roll cutting method, when the cutting tool roll 2 rotates, the bite of the cutting tool 1 into the anvil roll 4 at the cutting point is smaller than in the shear cutting method. It becomes small, the veneer veneer 3 is not completely cut and separated at the time of cutting, and the front end edge of the veneer veneer 3 immediately after cutting is cut while the tool 1 biting into the anvil roll 4 rises. Along the loading surface of the veneer veneer 3 of No. 1, the veneer veneer 3 floats up and becomes curved in association with its ascending force, resulting in damage to the veneer veneer 3 as well as buckling of the veneer veneer 3 on the blade 1. When they interfered and remained at the cutting position to cause clogging, it was a cause of trouble.

"Means for Solving Problems" In view of the above, the present invention has an anvil roll 4 for supporting the blade 1 on a blade roll 2 to which a long blade 1 is attached in the longitudinal direction thereof. The rotation speed of the blade roll 2 from the cutting start position where the blade edge of the blade 1 abuts at least the upper surface of the veneer veneer 3 to be carried in to the cutting end position where the blade edge of the blade 1 abuts against the upper surface of the anvil roll 4. Is set to be slightly higher than the loading speed of the veneer veneer 3 so as to eliminate the above-mentioned trouble that occurs during cutting.

[Examples] Hereinafter, the method of the present invention will be described with reference to the accompanying drawings.
The parts already described are given the same reference numerals and will not be described again.

First, in FIG. 1, a continuous veneer veneer 3 that has been rotationally cut by a veneer lace (not shown) is a carry-in conveyor 5 that is driven at a constant speed as it is or through a veneer dryer (not shown). Thus, the veneer veneer 3 of the roll-cut type is conveyed to the cutting position 6 and is then conveyed onto a carry-out conveyor 7 driven at a peripheral speed slightly higher than that of the carry-in conveyor 5.

Above the transport surface 8 at the cutting position 6, the veneer veneer 3 is placed.
Long blade 1 over the longitudinal direction orthogonal to the transport direction of
Is attached in parallel with the roll axis of the blade roll 2 with its blade tip portion protruding from the roll circumference. An anvil roll 4 that supports the cutting tool 1 is provided below the transport surface 8.

The anvil roll 4 is linked to a carry-in conveyor 5 that is driven in synchronization with the carrying speed of the preceding step, and is rotated at the same speed as the veneer veneer 3 speed carried on the carry-in conveyor 5. On the other hand, the blade roll 2 is connected to the variable speed motor 9, and is sharply accelerated in the rising region as compared with the loading speed of the veneer veneer 3, and in the deceleration region after cutting,
The veneer veneer 3 is maintained at a stopped state at a speed lower than the loading speed and the blade 1 at the standby position. At this time, the anvil roll 4 has a cam clutch (not shown) at its one shaft end and the shaft end of the cutter roll 2
When the cutting tool roll 2 has a relatively large difference from the rotation speed of the cutting tool roll 2, for example, the rotation speed of the cutting tool roll 2 is higher than the rotation speed of the anvil roll 4, When the blade edge of No. 1 bites into the upper surface of the anvil roll 4, it is controlled so as to synchronize with the rotational speed of the blade roll 2 while idling.

Then, the blade roll 2 is temporarily stopped at the standby position, but when the variable speed motor 9 is activated by a preset value in which the standard length is set or by an arbitrary detection command, the blade 1 of the blade 1 is moved from the standby position. At the position where the blade edge comes into contact with the upper surface of the veneer veneer 3, that is, in the rising region up to the cutting start position A, the blade edge rotates at a rapid acceleration. Next, the rotation speed of the blade roll 2 from the cutting start position A to the cutting end position B is set to be slightly higher than the loading speed of the veneer veneer 3, and the cutting start position is changed by changing the speed. The arcuate distance drawn by the blade edge of the blade 1 from A to the cutting end position B and the time required for the straight veneer veneer 3 to be conveyed are substantially the same, and the blade edge of the blade 1 bites into the anvil roll 4. The large amount enables reliable cutting.

Next, the relationship between the arcuate distance drawn by the blade tip of the blade roll 2 from the cutting start position A to the cutting end position B and the transport distance of the veneer veneer 3 will be described based on the principle explanatory view of FIG. To do.

In this principle explanatory view, R is the distance from the axis of the blade roll 2 to the cutting edge of the blade 1, and is the cutting radius.

V ₁ is the rotational speed of the blade roll 2.

V ₂ is the carry-in speed of the carry-in conveyor 5.

A is the position where the cutting edge of the cutting tool 1 contacts the upper surface of the veneer veneer 3.

B is the position on the line where the cutting edge of the cutting tool 1 connects the axes of the anvil roll 4 and the cutting tool roll 2.

 T is the thickness of the veneer veneer 3.

And the rotation speed V ₁ of the blade roll 2 and the carry-in conveyor 5
The relationship of the loading speed V ₂ of the following is as follows.

First, the arc-shaped distance drawn by the cutting edge of the cutting tool 1 in the range R-X required from the start of cutting the veneer to the end of cutting in FIG. The transport distance of veneer veneer 3 is RCOSωT.

As is clear from the figure, the relationship between the two is Becomes

That is, a circle drawn by the cutting edge of the cutting tool 1 in a range from a position A where the cutting edge of the cutting tool 1 contacts the upper surface of the veneer veneer 3 to a cutting end position B where the cutting edge of the cutting tool 1 digs into the upper surface of the anvil roll 4. The arc-shaped distance is longer than the transportation distance of veneer veneer.

When the rotational speed V ₁ of the cutter roll 2 and the carry-in speed V ₂ of the carry-in conveyor 5 are the same as in the conventional case, the veneer veneer 3 linearly moving from A to B is attached to the cutting edge of the cutter 1 that makes a circular motion. Tries to move at the same speed, but the veneer veneer 3 also has a blade edge of the blade 1 because the blade tip of the blade 1 moves longer than the linear distance from A to B where the veneer veneer 3 originally moves. Even though the veneer 1 is moving at the same speed, the cutting edge of the cutting tool 1 interferes with the conveyance of the veneer veneer 3, and the veneer veneer 3 buckles at the back surface of the cutting tool 1.

On the other hand, in the present invention, V ₁ and V ₂ are not the same, but originally, the time required for the veneer veneer 3 to go from A to B and the time for the cutting edge of the cutting tool 1 to go from A to B are set. the rotational speed V ₁ of the speed, that blade roll 2 of the cutting edge of the blade 1 so that the same set to be slightly faster than the carry speed V ₂ of the speed, that input conveyor 5 of veneer 3, veneer 3 Since the veneer veneer 3 is cut while being pulled so as not to tear it, the veneer veneer 3 is reliably separated without buckling on the back surface of the blade 1.

3 to 5 are time charts based on the cutting width of the veneer veneer 3, where the vertical axis represents the peripheral speed m / min of the blade roll 2 and the horizontal axis represents the time S. There is. In each drawing, based on the preset value in which the standard width is set, the blade roll 2 that has been standing by in a stopped state rises at a rapid acceleration from time SO, and reaches cutting rotation at time S1, and from time S2 to The veneer veneer 3 is cut at time S3, and then decelerated from time S4, and again at time S5, the stand-by state is resumed, and the stand-by state is stopped until the next rising time S6. Therefore, if there are a plurality of preset values for the preset standard width, as shown in the illustrated example, from the time S5 of being in the standby state to the next rising time S6.
Is adjusted by increasing or decreasing the stop time until.

In this embodiment, the cutter roll 2 is arranged above and the anvil roll 4 is arranged below the conveying surface 8. However, the positions of the rolls are relatively reversed, and the anvil roll 4 is arranged above. The blade roll 2 may be arranged below, and the number of blades 1 attached to the blade roll 2 may be arbitrary.

[Effect] As described above, according to the method of the present invention, the anvil roll 4 that supports the blade 1 is provided opposite to the blade roll 2 to which the long blade 1 is attached in the longitudinal direction thereof. ,
At least the cutting edge of the cutting tool 1 comes into contact with the upper surface of the veneer veneer 3 to be carried in, from the cutting start position A to the cutting end position B that bites into the upper surface of the anvil roll 4. The veneer veneer 3 and the veneer veneer 3 are linearly conveyed from the cutting start position A to the cutting end position B in the arcuate distance drawn by the blade edge because the plate 3 is set to be slightly faster than the loading speed. By making the time required for the distances substantially the same, increasing the amount of cutting edge of the blade 1 with respect to the anvil roll 4 to reduce the cutting error and improving the cutting condition, the troubles occurring during cutting can be eliminated. is there.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of the present invention, FIG. 2 is an explanatory view of the principle of the present invention, FIGS. 3 to 5 are time charts based on the cutting width of veneer veneer, and FIG. FIG. 6 is a schematic side view showing a conventional method. 1 ... Blade, 2 ... Blade roll, 3 ... Veneer veneer, 4
...... Anvil roll, 5 ... Incoming conveyor, 6 ... Cutting position, 7 ... Unloading conveyor, 8 ... Conveying surface, 9 ... Variable speed motor,

Claims (6)

(57) [Claims] 1. A veneer single unit in which an anvil roll for supporting the blade is provided opposite to a blade roll having a long blade attached in the longitudinal direction thereof, and at least the blade edge of the blade is carried in. From the cutting start position that abuts the upper surface of the plate to the cutting end position that bites into the upper surface of the anvil roll, set the rotation speed of the blade roll to be slightly higher than the loading speed of the veneer veneer, A method for cutting a veneer veneer, characterized in that the time required for drawing the arc-shaped distance and the distance for the veneer veneer to be conveyed linearly are substantially the same. 2. The veneer veneer cutting method according to claim 1, wherein the blade roll is arranged above and the anvil roll is arranged below. 3. The veneer veneer cutting method according to claim 1, wherein the anvil roll is arranged above and the blade roll is arranged below. 4. A veneer roll is provided with an anvil roll for supporting the blade in opposition to a blade roll to which a long blade is attached in the longitudinal direction thereof, and the blade is rapidly accelerated from a standby position. After cutting the veneer veneer at a speed slightly higher than the plate loading speed, decelerating and returning it to the standby position again, and increasing or decreasing the stop time from the time when the blade is in the standby state to the next rising time A method for cutting a veneer veneer, comprising adjusting the cutting width of the veneer veneer. 5. The veneer veneer cutting method according to claim 4, wherein the blade roll is arranged above and the anvil roll is arranged below. 6. The veneer veneer cutting method according to claim 4, wherein the anvil roll is arranged above and the blade roll is arranged below.