JPH0829527B2 - Standard length cutting device for veneer laminating machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for accurately performing fixed-length cutting of a laminating machine that laterally or vertically strips veneer in a plywood manufacturing process.

(Prior art) A push-feed type single plate laminating machine is a free-running sandwich conveyance path in which a forced-feeding-in conveyer with a strong feed force and the following single plate are slidable and a braking action is applied to the single plate. The abutting front and rear end faces of the veneer conveyed one after another at the position where the forced feeding force of the carry-in conveyor disappears, and the horizontal or vertical stripping is performed with an adhesive. As a means, a cutting device and an unloading conveyor are provided at the rear of the free-running nip transport path, and a fixed distance is set in front of the fixed length position set on the unloading conveyor with a transport distance corresponding to the operation delay time of the cutting device. A method in which a detector is provided and the carrying conveyor is not stopped or temporarily stopped by the detection signal of the preceding veneer detected by the standard length detector to perform the standard length cutting of the bonded veneer by the cutting device, or Japanese Patent Publication No. 56-1720.
Like the abutting position switching device in the horizontal plate of the single plate disclosed in No. 3, it is equipped with a fixed pressing bar and a movable pressing bar that are divided into front and rear as a pressing bar for pressing the endless belt of the forced-feeding-in conveyer. The distance between the bar and the movable pressing bar is set to be equal to or longer than the transport distance corresponding to the operation delay time of the intermittent control device that operates the sizing clipper, and the sizing detector on the unloading conveyor and the cutting prediction with the above interval in front of it. There is a method of switching the abutting position by moving the movable pressing bar up and down so that the leading edge of the preceding veneer can be cut to a fixed length without stopping between the cutting predictor and the fixed length detector.

(Problems to be solved by the invention) In veneering of veneers, veneers to be veneered, especially veneered veneers with a small width to be veneered in the lateral vacancies, are not constant in width, that is, in the conveying direction. If the trailing veneer pushes the preceding veneer and the tip of the preceding veneer reaches the position of the standard length detector during the pushing, it has a width that continuously reaches the standard length position. Normal length cutting is performed, but depending on the width of the subsequent veneer, the leading edge of the preceding veneer may reach the position of the standard length detector and then stop until the standard length position. Has a drawback that it does not cut to standard length, and in the latter case, since the abutting position is switched, the distance to the nip transport path is extended and troubles such as breakage of veneer occur, and it also moves. Since the pressure bar moves up and down, there is an error in operation However, there was a problem in that it was not possible to expect accurate cut-to-length cutting due to instability, and the equipment cost was high.

(Means for solving the problem) A standard length detector for detecting the preceding veneer is provided on the carry-out conveyor on the carry-in side from the standard position with a carry distance corresponding to the brake operation delay time of the drive mechanism of the carry-in conveyor. , A correction detector for detecting the subsequent veneer is installed on the carry-in side of the abutting position at a distance corresponding to the brake operation delay time of the drive mechanism of the carry-in conveyor, and the correction detector detects the rear end of the subsequent veneer. When the fixed length detector detects the leading edge of the preceding veneer, the correction detector detects the trailing edge of the following veneer. If not, the drive mechanism of the carry-in conveyor and the operating mechanism of the cutting device are activated, and when the correction detector detects the trailing edge of the subsequent veneer and the running counter is counting, the drive mechanism of the carry-in conveyor. And the operating mechanism of the cutting device is not activated The counting of the line amount counter is stopped and the count value up to that point is stored, and when the correction detector detects the leading edge of the next succeeding veneer, the running amount counter newly starts counting and counts the stored count value. A control circuit for activating the drive mechanism of the carry-in conveyor and the operating mechanism of the cutting device at the end of the counting is provided.

(Operation) When the fixed-length detector detects the leading edge of the preceding veneer and the correction detector does not detect the trailing edge of the following veneer, the leading edge of the preceding veneer is positioned at the fixed-length detector and the fixed-length position. The transportation continues without stopping between and stops at the standard length position. When the fixed length detector detects the leading edge of the preceding veneer, the correction detector detects the trailing edge of the following veneer and the running counter is counting, that is, the leading edge of the preceding veneer is the fixed length detector. When stopping between the fixed position and the fixed length position, the carry-in conveyor is not stopped and the cutting device is not activated, and counting is stopped, that is, the trailing edge of the subsequent veneer is the correction detector. When the correction detector detects the leading edge of the next succeeding veneer and counts the same as the stored count value, the brake operation of the carry-in conveyor is activated and the preceding single unit is memorized. When the tip of the leading veneer reaches the standard position, the leading veneer stops and the standard length cutting is performed when the tip of the preceding veneer reaches the standard position.

(Embodiment) FIG. 1 shows an embodiment of constant-length cutting in a single-plate horizontal stripping machine.
Multiple endless belts 4 stretched over and upper and lower rotating wheels 5,
A plurality of upper endless belts 7 stretched on 6 and a drive mechanism 8 composed of a motor, a clutch / brake, etc. for rotationally driving the shafts of the front wheels 2, 5 are provided, and the veneer is orthogonal to the fibers. The lower endless belt 4 is provided with a fixed bar 9 for supporting the back surface on the runway side, and the upper endless belt 7 is provided with elastic bodies 10 for pressing the back surface on the runway side. Equipped with supported pressing bars 11, the carrying conveyor 1 imparts a strong forced feeding force to the veneer by these bars, and this forced feeding force disappears near the ends of these bars.

The free-running nip conveyance path 12 includes an upper bar 13 and a lower bar that are elongated in the conveying direction of the plurality of carry-in conveyors 1, respectively.
14 and 14 form a single-plate slidable running path following the carry-in conveyor 1, and the upper bars 13 are elastic bodies 15 respectively.
Is supported by the veneer to give the veneer a proper braking action on the track. Then, the veneer conveyed by the carry-in conveyor 1 is sent to the free-running sandwiching and conveying path 12 by the disappearance of the forced feeding force of the carry-in conveyor 1 and the appropriate braking action of the sandwiching and conveying path 12 in the free traveling. The end stops at the abutting position XX where the forced feeding force of the carry-in conveyor 1 disappears, and the front end of the next veneer collides with the stopped front veneer, and the front veneer of the preceding veneer strikes. The plate is pushed forward, and its rear end stops at the abutting position XX. By repeating this process, a continuous strip-shaped veneer is formed by a narrow veneer. Generally, an adhesive such as hot melt is applied to the front end surface of the succeeding veneer A in the previous step, and if necessary, free running is performed. In the sandwiching and conveying path 12, a yarn such as a hot melt yarn is attached to the plate surface of the veneer in a direction orthogonal to the fibers to form a continuous strip-shaped laterally-stripped preceding veneer A-1.

In the rear of the free-running nip conveyance path 12, the receiving blade 16 and the blade 1
7. A cutting device 19 including an operating mechanism 18 such as a fluid pressure cylinder for moving the blade 17 up and down is provided. When the cutting device 19 cuts the preceding veneer A-1 to a fixed length, the carry-in conveyor 1
Is to be paused. A unloading conveyor 20 is provided following the cutting device 19, and the unloading conveyor 20 is generally driven continuously and uses an endless belt having a small friction coefficient with the preceding veneer A-1.

On the carry-out conveyor 20, a fixed length position Y-Y is set at a position separated from the cutting position P-P of the cutting device 19 by a fixed length dimension L rearward, and the fixed side position Y-Y is loaded on the carry-in side. A standard length detector 21 for detecting the preceding veneer A-1 with a conveying distance D corresponding to the brake operation delay time of the drive mechanism 8 of the conveyor 1
To provide. A correction detector 22 for detecting the succeeding veneer A is also provided on the carry-in side of the abutting position XX, with the carrying distance D corresponding to the brake operation delay time of the drive mechanism 8 of the carry-in conveyor 1 being separated. The drive shaft of the rotating wheel 5 is provided with a pulse transmitter 23 such as an encoder for transmitting a pulse signal proportional to the traveling amount of the succeeding veneer A conveyed by the carry-in conveyor 1, and the pulse transmitter 23 uses the correction detector 22. The counting is started by detecting the trailing edge of the succeeding veneer A, and the addition or subtraction corresponding to the traveling amount of the succeeding veneer A carried by the carry-in conveyor 1 is performed, and the count value corresponding to the carrying distance D is obtained. It is connected to a running amount counter 24 such as an adder / subtractor which is reset when it reaches. The running amount counter 24 is connected to a control circuit 25 such as a sequencer, and the control circuit 25 is connected to the standard length detector 21, the correction detector 22, the drive circuit 26 of the drive mechanism 8 and the operation circuit 27 of the operation mechanism 18. There is.

Explaining the point of implementation, as described above, the end faces of the carry-in conveyor 1 and the sandwiching and conveying path 12 abut each other at the abutting position XX, and the preceding single plate formed into a continuous strip by the interposition of the adhesive. When the front end of A-1 reaches the position of the fixed length unloader 21, the drive mechanism 8 of the carry-in conveyor 1 and the operating mechanism 18 of the cutting device 19 are activated by the signal, and the preceding veneer A-
1 is stopped and the cutting device 19 cuts the standard length. Depending on the stop position immediately before the tip of the preceding veneer A-1 reaches the standard length detector 21 and the size of the succeeding veneer A to be inserted. Shows the case where the leading edge of the preceding veneer A-1 reaches the position of the standard length detector 21 and then continuously reaches the standard length position YY without stopping, as shown in FIG. In some cases, the leading end of the preceding veneer A-1 stops between the standard length detector 21 and the standard length position YY as shown in FIG.

In the diagram shown in FIG. 2A, the rear end of the leading veneer A-1 is stopped at the abutting position XX, and the trailing veneer A-1 is stopped.
Shows the state immediately before the rear veneer A-1 collides with the preceding veneer A-1, and FIG. 2B shows that the subsequent veneer A collides with the preceding veneer A-1 and pushes it to the front veneer A-1. Shows the state in which the front end of the sheet has reached the position of the standard length detector 21, and the rear end of the succeeding veneer A has not reached the position of the correction detector 22. The signal that the standard length detector 21 has detected the leading edge of the preceding veneer A-1 is transmitted to the control circuit 25, and at this time, the trailing edge detection signal of the succeeding veneer A from the correction detector 22 is not transmitted. A signal is transmitted from the control circuit 25 to the drive circuit 26 and the operation circuit 27 to activate the brake operation of the drive mechanism 8 and the disconnection operation of the operation mechanism 18. The leading end of the preceding veneer A-1 that has reached the position of the fixed length detector 21 advances by the conveying distance D corresponding to the operation delay time after the brake of the drive mechanism 8 is activated, and the result is shown in FIG. As shown in (4), it stops at the standard length position Y-Y, and the cutting operation of the operating mechanism 18 causes the cutting of the preceding single plate A-1 to the standard length L. Thus, when the length detector 21 detects the leading edge of the preceding veneer A-1 and the correction detector 22 does not detect the trailing edge of the following veneer A, normal length cutting is performed. Also, control by the control circuit 25 is performed.

In the diagram shown in FIG. 3A, the rear end of the leading veneer A-1 is stopped at the abutting position XX and the trailing veneer A-1 is stopped.
Shows the state immediately before the rear veneer A-1 collides with the preceding veneer A-1, and FIG. 3 (b) shows that the subsequent veneer A collides with the preceding veneer A-1 and pushes it to feed the preceding veneer A-1. The leading end of No. 1 reaches the position of the standard length detector 21, and the trailing end of the succeeding veneer A passes through the position of the correction detector 22 and advances by the correction distance d. Correction detector
When 22 detects the rear edge of the succeeding veneer A, its signal is the control circuit.
It is transmitted to the mileage counter 24 via 25, and the mileage counter 24
Starts counting, on the other hand, the signal that the standard length detector 21 has detected the leading edge of the preceding veneer A-1 is transmitted to the control circuit 25, and the control circuit 25
From this signal, the signal for stopping the counting is transmitted from the 25 to the running amount counter 24, and the running amount counter 24 stores the count value corresponding to the correction distance d counted up to that point. In the diagram shown in FIG. 3C, the joined front veneer A-1 and the succeeding veneer A are further advanced by the forced feeding of the carry-in conveyor 1, and the rear end of the succeeding veneer A is at the abutting position. The state where the next succeeding veneer A1 reaches the position of the correction detector 22 and then advances by the correction distance d to the position where it stops in accordance with XX is shown. In this case, the preceding veneer A-1 reaches the position separated by the correction distance d from the standard length position Y-Y. The signal from the correction detector 22 which detects the leading edge of the next succeeding veneer A1 is sent to the traveling amount counter 24 through the control circuit 25, and the traveling amount counter 24 counts the count value corresponding to the stored correction distance d. After counting, the control circuit 25 sends a signal to the drive circuit 26 to activate the brake operation of the drive mechanism 8 and also to the actuation circuit 27 to send a signal to the actuation mechanism 18. Trigger the cutting action. The above-mentioned braking and disconnecting operations can be triggered by subtracting the stored count value from the time when the leading edge of the subsequent veneer is detected and reaching zero. The diagram shown in FIG. 3 (d) shows that the following succeeding veneer A1 is further advanced to push forward and join the preceding veneer A-1 and the following veneer A, The state where the front end coincides with the standard length position Y-Y and is stopped is shown. In this case, when the leading edge of the next succeeding veneer A1 advances from the position shown in FIG. 3 (c) by the conveying distance D, the brake operation is completed and stops. Is (C)
Since the preceding veneer is pushed forward after advancing a distance D-d from the position shown in the figure, the distance actually pushed is the correction distance d, and therefore the tip of the preceding veneer A-1 is at the standard position. It will stop in accordance with YY. After this stop, the cutting device 19 cuts the standard length L. The running amount counter 24 resets the count value after counting until the count value corresponding to the transport distance D is reached. In this way, when the fixed-length detector 21 detects the leading edge of the preceding veneer A-1, the correction detector 22 detects the trailing edge of the following veneer, and the running amount counter 24 is counting, that is, Even when the leading edge of the preceding veneer stops between the fixed length detector 21 and the fixed length position YY, the leading edge of the leading veneer is always controlled by the running amount counter 24 and the control circuit 25. It stops at the same time as -Y, and the accurate fixed-length cutting of the fixed-length L is performed. In addition, although the example has been described with respect to the lateral strip of the veneer, a forced feeding carry-in conveyor, a free-running nip conveying path, a cutting device, a carrying-in conveyor, etc. are provided, while the veneer is conveyed in the fiber direction by pushing. Even when performing vertical stripping of veneers that are conveyed one after another, the same standard length detector, correction detector, running amount counter, control circuit, etc. are provided to ensure accurate vertical scale It can be cut. In addition, the correction detector 22
If a slight detection error occurs in the positions of the trailing edge and the leading edge when detecting the trailing edge of the following trailing sheet and when detecting the leading edge of the next trailing sheet, separate the trailing edge and the leading edge. The error is prevented by appropriate means such as using two sets of correction detectors for detection.

(Effects of the Invention) A fixed-length detector and a correction detector are provided on the carry-in side at the fixed-length position and at the abutting position, respectively, with a transport distance corresponding to the brake operation delay time of the drive mechanism of the carry-in conveyor. Detects the leading edge of the preceding veneer, and the correction detector does not detect the trailing edge of the following veneer, that is, the leading edge of the preceding veneer pushed by the following veneer is the standard length detector and the standard length detector. If it does not stop between positions, it controls the activation of the stop of the carry-in conveyor and the activation of the cutting of the cutting device, and when the fixed-length detector detects the leading edge of the preceding veneer, the correction detector detects the trailing edge of the succeeding veneer. When the traveling amount counter is counting by detecting, that is, when the leading edge of the preceding veneer pushed by the succeeding veneer stops between the fixed length detector and the fixed length position, the carry-in conveyor is stopped. The cutting device is not activated and the movement amount count value of the trailing edge of the following veneer is stored. , When the correction detector detects the leading edge of the next succeeding veneer and reaches the stored count value, the travel amount counter that activates the stop of the carry-in conveyor and the disconnection of the cutting device and the control circuit that controls these are provided. Since it is a configuration equipped, the tip of the preceding veneer stops at the fixed length position regardless of the size of the subsequent veneer,
It always cuts to a precise fixed length and can be performed with only a simple electric circuit, which does not require complicated and expensive equipment unlike the conventional method, and makes a great contribution to the plywood industry. is there.

[Brief description of drawings]

The drawings show one embodiment of the present invention, in which FIG. 1 is a side view and FIG.
FIGS. 1A, 1B and 1C, and FIGS. 3A, 3B, 3C, and 3D are explanatory views showing the procedure of constant length cutting. 1 ... carry-in conveyor, 8 ... drive mechanism 12 ... free-moving nip-conveying path, 18 ... operating mechanism 19 ... cutting device, 20 ... carry-out conveyor 21 ... fixed length detector, 22 ... correction detection Device 23 …… Pulse oscillator, 24 …… Traveling amount counter 25 …… Control circuit, A, A1 …… Succeeding veneer A-1 …… Preceding veneer, D …… Conveying distance d …… Correction distance, L …… Standard size PP …… Cutting position, XX …… Abutting position YY …… Standard position

Claims (1)

[Claims] 1. An intermittently driven forced-feeding-in conveyor,
In a push-feed type veneer laminating machine that is equipped with a sandwiching conveyance path for free running of veneers, a cutting device, a carry-out conveyor, etc., and temporarily stops the carry-in conveyor to perform fixed length cutting, a predetermined fixed position is provided behind the cutting device. On the carry-in side of the standard length position set by the length dimension, a constant length detector for preceding veneer detection is provided with a transport distance corresponding to the brake operation delay time of the drive mechanism of the carry-in conveyor. On the carry-in side of the abutting position where the forced feeding force disappears, a correction detector for detecting the subsequent veneer is provided with a conveyance distance corresponding to the brake operation delay time of the drive mechanism of the carry-in conveyor, and the correction detector follows. Equipped with a traveling amount counter such as an adder / subtractor that starts counting of addition or subtraction proportional to the traveling amount of the single plate when the rear end of the single plate is detected and is reset when the count value corresponding to the transport distance is reached. And When the fixed length detector detects the leading edge of the preceding veneer and the correction detector does not detect the trailing edge of the following veneer and the running counter is not counting, the brake of the drive mechanism of the carry-in conveyor When the fixed-length detector detects the leading edge of the preceding veneer, the correction detector detects the trailing edge of the following veneer to count the amount of travel. When the counter is counting, the brake operation of the drive mechanism of the carry-in conveyor and the cutting operation of the operating mechanism of the cutting device are not activated, and the counting of the running amount counter is stopped and the count value up to that time is stored. , When the correction detector detects the leading edge of the next succeeding veneer, the running amount counter newly starts counting, counts up to the stored count value, and resets the running amount count value and the stored value at the end of counting, and at the same time. Drive mechanism of the carry-in conveyor Fixed-length cutting device of the single plate seam machine which is characterized by being configured with a control circuit for triggering the cutting operation of the actuation mechanism of the cutting device as well as trigger the braking.