JPH03253302A - Control device for driving of conveyer in veneer jointing machine - Google Patents

Abstract

PURPOSE:To perfectly execute the precision parallel cutting action of narrow veneer by its procision parallel conveying action by a method wherein the setting of the specified buffering accelerating time and of the specified buffering decelerating positioning time are made possible and leading-in and leading-out conveyers are intermittently driven by means of servo motors and a digital controlling circuit. CONSTITUTION:By starting the servo motors 3a and 3b of a leading-in and a leading-out conveyers 2a and 2b, the buffering accelerating time of the former of which is set in advance to be 40ms or more and up to about 200ms or preferably near 40 ms and the buffering decelerating positioning time of the latter of which is set in advance to be 80ms or more and up to about 200ms or preferably near 80ms, the conveying of narrow veneers 1 and 1a on the leading-in conveyer 2a is started and their defective parts to be cut off are detected with a veneer detector 9. The detection signal is transmitted to the sequencer 8 of the digital controlling circuit 4 so as to perform the intermittent driving control of the servo motors 3a and 3b and one-rotation controlling and half-rotation controlling of intermittent driving mechanisms 14a and 14b, which are respectively journaled to the crankshafts 11 and 13 of a clipper 10 and of a chip separating conveyer 12, are alternately performed. As a result, the veneers are conveyed precisely in parallel, resulting in allowing to successively and regularly deliver intermediate products, which are cut precisely in parallel, on the leading-out conveyer 2b.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention involves cutting a narrow veneer having irregular edges, cracks, knot holes, etc. into lengths while being intermittently conveyed by a conveyor, and Digital control of the servo motor applied to a veneer cross-cutting machine that applies adhesive to the end face or adheres adhesive thread to the board surface to join each other in a blind shape, cut it to a fixed length, and stack it. This invention relates to a conveyor drive control device.

[Conventional technology]

In the conventional veneer horizontal stripping machine, as illustrated in FIG. 7, the conveyor 15 that intermittently conveys the narrow veneer 1 is equipped with a so-called open loop consisting of an electromagnetic clutch brake 16, a motor 17, etc. Since the conventional method was to equip the intermittent drive mechanism 18 with only the conveyance control function,
As illustrated in FIG. 8, the intermittent conveyance characteristics include the acceleration time (ta) for reconveying the previously cut narrow width veneer 1 by the conveyor 15, and the acceleration time (ta) of the narrow width veneer 1 to be cut next. The deceleration time (td) for positioning the veneer 1 by the conveyor 15 is a rapid acceleration/deceleration operation of about 1 Qms, and therefore the conveying posture of the narrow veneer 1 during the conveyance process is as follows.
As illustrated in the figure, unstable slipping occurs due to differences in inertia and frictional resistance during acceleration and deceleration, and the left and right conveyance amount is irregularly disturbed, resulting in diagonal cuts and bends, resulting in a front edge that could not be obtained normally. A short dimensional width W that cannot be cut into an intermediate product with the maximum dimensional width W1 with the trailing edge parallel to each other, and most of it is transformed into a parallelogram.
Not only was there a wasteful cut-off area as shown by diagonal lines when the intermediate product of 2 was cut, but also the small-width veneer 1 that was cut into the intermediate product of short width W2 transformed into the parallelogram was cut off from each other. As shown in Figure 10, when joining veneers into a blind shape, a saw blade-like unevenness occurs on both ends of the wood, and it is not possible to perform horizontal stripping at W3 during the crease at the beginning of cutting the veneer, which could normally be obtained. During the narrow cutting W4 that avoided the blade-like unevenness, there was a wasteful cut-off part that had to be obtained by side-splitting product 1b.

[Invention or problem to be solved]

As mentioned above, the conveyor drive control device for conventional veneer side stripping machines has been equipped with an intermittent drive mechanism consisting of an electromagnetic clutch brake, a motor, etc., which has only a so-called open-loop conveyance control function. Therefore, 1 caused by the conveyance process of the narrow veneer by the conveyor.
Due to the sudden deceleration of about 0m5, the left and right conveyance of the narrow veneer is irregularly disturbed, causing diagonal cuts and bends.
In order to eliminate the disadvantage that wasteful cutting points occur one after another on both edges of an intermediate product and both ends of a side-splitting product, which significantly reduces the veneer yield and plywood yield, the present invention has been developed to By providing an arbitrarily settable buffer acceleration/deceleration time of 40ms or more or 8Qms or more using an intermittent drive mechanism equipped with a so-called closed-loop conveyance control function, precision is achieved through precise parallel conveyance of narrow veneer plates. The purpose is to complete parallel cutting operations.

[Means to solve the problem]

In order to achieve the above object, the present invention configures a conveyor drive control device into an intermittent drive mechanism equipped with a so-called closed-loop conveyance control function using a servo motor and a digital control circuit. The present invention provides a buffer acceleration/deceleration time that can be set arbitrarily, that is, the present invention provides a buffer acceleration/deceleration time that can be set arbitrarily. A buffer acceleration time of 40 ms or more can be set, and a buffer deceleration time of at least 80 m5 or more can be set during a deceleration operation for positioning the narrow veneer to be cut next by the conveyor. The loading and unloading conveyors are configured to be driven intermittently by a servo motor and a digital control circuit.

In addition, the digital control circuit includes a servo drive unit that drives the servo motor, a servo controller for positioning, and servo parameters for initial setting.
A sequencer for command control is installed, and a veneer detector is installed between the rows of the above-mentioned conveyor to detect the cut point of the narrow veneer. is connected to a sequencer of a digital control circuit, and further includes a crankshaft of a clipper that cuts the narrow veneer to a specified width, and a crankshaft of a waste separation conveyor installed between the clipper and the unloading conveyor. This is a drive control device for a conveyor in a veneer cross-cutting machine, each of which is equipped with an intermittent drive mechanism consisting of an electromagnetic clutch brake, a servo motor, a pneumatic cylinder, a hydraulic cylinder, etc.

[For production]

Since the present invention is configured as described above, the intermittent conveyance characteristics when the loading and unloading conveyors are intermittently controlled by the servo motor and the digital control circuit are as follows: It is possible to set a buffer acceleration time 'l'-a of at least 40m5 during the acceleration operation for carrying in and retransporting the narrow veneer after finishing the cutting process, and for retransporting the narrow veneer to be cut next. It is possible to set a buffer deceleration time Td of at least B□ms or more during the deceleration operation for positioning by the carry-in and carry-out conveyors. The device of the present invention eliminates the problem where the left and right conveyance of the narrow veneer is irregularly disturbed due to the deceleration operation, resulting in diagonal cutting and bending. By completely preventing this, as illustrated in FIGS. 3 and 4, the narrow width veneer 1 can be obtained with a good yield as an intermediate product with the maximum dimensional width W5 with the front edge and the rear edge parallel to each other. Not only was it possible to do this, but it was also possible to apply an adhesive such as hot melt resin to the end surface of the intermediate product, or to attach adhesive thread impregnated with adhesive such as hot melt resin to the board surface of the intermediate product. Even when joining mutual narrow width veneers 1 to the blind-shaped cross-separated product 1b, the edges of the narrow width veneers 1 can be joined to the initial marking W3 of the veneer cutting without producing saw-blade-like irregularities on both ends. Horizontal strip product 1
It was possible to obtain a high yield by aligning W4 during cutting in b.

〔Example〕

FIG. 1 shows an example of the implementation of the present invention. First, the veneer horizontal stripping machine loads a narrow veneer 1 having irregular edges, cracks, knot holes, etc. onto an incoming conveyor 2a. A limit is installed between the rows of the carrying-in conveyor 2a so that defects such as irregular edges, cracks, knotholes, etc. to be cut and separated in the narrow veneer 1 can be detected by thickness or shape while the conveyance is started. A single plate detector 9 consisting of a switch, a photoelectric switch, etc. detects the signal and sends the detection signal to the sequencer of the digital control circuit 4.
8, the sequencer 8 activates the clipper 10 and the waste separation conveyor 12 to cut the product into intermediate products of a certain width, separate the waste, and convey it to the conveyor 2b.
Pass this on to the top. On the other hand, a spot applicator 19 for applying an adhesive such as hot melt resin to the end surface of the intermediate product in the conveyance process, and a thread nozzle 20 for feeding adhesive thread impregnated with the adhesive onto the board surface are installed on the carry-out conveyor 2b. has been
Further, a braking rail member 21 is connected to the exit side of the conveyor 2b for applying a braking force to the intermediate products in the conveying process and joining the intermediate products to the cross-separated products 1b. Further, the blind-shaped cross-cut product 1b discharged from the brake rail member 21 is cut into a desired fixed size by a clipper 22, and is dropped and deposited at a predetermined location by a relay conveyor 23 and an opening/closing conveyor 24, and the stacked product I
It becomes C. In the figure, 11 is a crankshaft that moves the clipper 10 up and down, 13 is a crankshaft that opens and closes the waste separation conveyor 12, and 14a and 14b are crankshafts 11.
13, an intermittent drive mechanism consisting of an electromagnetic clutch brake, a servo motor, a pneumatic cylinder, a hydraulic cylinder, etc. capable of controlling one rotation and half a rotation, 25
is a crankshaft that moves the clipper 22 up and down.

In the case of paddy, the conveyor drive control device of the present invention in the veneer cross-cutting machine described above operates at least during acceleration operations for carrying in and retransporting the narrow width veneer 1a that has been cut previously and by the carrying-out conveyors 2a and 2b. It is possible to set a buffer acceleration time Ta of 40 mS or more, and an M new speed time of at least 8 Qms or more during deceleration operation for positioning the narrow veneer 1a to be cut next by the loading and unloading conveyors 2a, 2b. Td can be set, the loading and unloading competition t2a,
2b to servo motors 3a, 3b and digital control circuit 4
It is configured to be driven intermittently. That is, the servos of the carrying-in and carrying-out conveyors 2a, 2b are carried out in conjunction with the sizing cutting operation of the narrow width veneer 1a and the chip separating operation by the clipper 10 and the scrap separating conveyor 12 of the veneer horizontal stripping machine of the present invention. The intermittent drive control by the motors 3a, 3b and the digital control circuit 4 is controlled by the initial setting servo parameters 7a, 7b built into the digital control circuit 4, as shown in the flowchart shown in FIG. 5, for example, over 40+ns. , a deceleration time of, for example, 80 m5 or more, and a conveyance speed of, for example, about 40 ut/man.

After that, the servo motors 3a, 3b of the loading and unloading conveyors 2a, 2b are controlled by the servo parameters 7a, 7b of the digital control circuit 4 and the servo controller 6.
a, 6b and the servo drive units 5a, 5b, the narrow veneers 1, 1 on the carry-in conveyor 2a are activated.
At a, the conveyance is restarted, and irregular edges, cracks, knotholes, etc. to be cut and separated are detected by the veneer detector 9, and the detection signal is transmitted to the sequencer 8 of the digital control circuit 4 to Servo parameters 7a, 7b, the servo controllers 5a, 6b, and the servo drive unit 5a.

5b controls the intermittent drive of the servo motors 3a and 3b, the clipper 10 and the waste separation conveyor 1.
Intermittent drive mechanism 14 mounted on the crankshaft 11.13 of No. 2
The carrying-in and carrying-out conveyors 2a,
By the buffer acceleration/deceleration control by the servo motors 3a, 3b and the digital control circuit 4 of 2b, the intermediate products that have been conveyed in a precise parallel manner and cut in a precise parallel manner can be sequentially and orderly delivered onto the unloading conveyor 2b. It has become possible.

〔Effect of the invention〕

As described above, the present invention uses an intermittent drive mechanism equipped with a so-called closed-loop conveyance control function to adjust the speed at which the conveyor accelerates or decelerates to 40 degrees, which can be set arbitrarily.
By providing a buffer acceleration/deceleration time of m5 or more or 801 TIS or more, it is possible to complete the precision parallel cutting operation of narrow width veneer by precise parallel conveyance operation for the first time, so it is different from the conventional veneer horizontal stripping machine. This problem was caused by an intermittent drive mechanism that only had a so-called open-loop conveyance control function, such as the conveyor drive control device in , which consists of an electromagnetic clutch brake and a motor. 10 to be done
Due to the rapid acceleration/deceleration movement of about m5, the left and right conveyance of the narrow veneer is irregularly disturbed, causing diagonal cutting and bending, and the wasteful cutting parts are removed from both edges of the intermediate product and both ends of the side-splitting product. It was possible to eliminate all the drawbacks that had been introduced one after another and significantly lowered the yield of veneer and plywood.
According to the present invention, not only can the veneer yield be significantly improved by minimizing the portions of each narrow veneer that are cut to size, but also the veneer yield can be significantly improved. This is an extremely remarkable implementation effect in that alignment was achieved during the marking process at the beginning of cutting the board, there was no core shortage after the plywood product was made, and the overall plywood yield was significantly improved.

[Brief explanation of drawings]

Fig. 1 is a side view explaining the drive control device of the present invention, Fig. 2 is a side view illustrating the drive control device of the present invention;
The figure also shows the intermittent conveyance characteristics of the conveyor, FIG. Figure 6 is a flowchart of the cutting operation, Figure 7 is a side view illustrating the conventional drive control device, and Figure 8 is a flowchart of the cutting operation.
9 is a plan view of a cut intermediate product, and FIG. 10 is a plan view of a joined cross-separated product. 1.1a... Small width veneer, 2a... Loading conveyor, 2
b... Unloading conveyor, 3a, 3b... Servo motor, 4... Digital control circuit, 5a, 5b... Servo drive unit, 6a, 5b... Servo controller, 7a, 7b... Servo parameter , 8...
Sequencer 19... Single plate detector, 10... Clipper, 11.13... Crankshaft, 12... Waste separation conveyor, 14a, 14b... Intermittent drive mechanism, Ta.
...Buffer acceleration time, Td...Buffer deceleration time.

Claims (1)

[Claims] 1. A conveyor (2a,
In the veneer cross-cutting machine, which cuts the veneer to a specified width while intermittently conveying the veneer (1a
), it is possible to set a buffer acceleration time (Ta) of at least 40 ms or more during the acceleration operation for reconveying by the conveyor (2a, 2b), and the narrow veneer (1a) to be cut next. The loading and unloading conveyor (2a
, 2b), the loading and unloading conveyors (2a, 2b) are connected to servo motors (3a, 3b) and a digital control circuit ( 4) A drive control device for a conveyor in a veneer cross-cutting machine, characterized in that the drive is controlled intermittently. 2. The digital control circuit (4) includes a servo motor (3
servo drive unit (5a, 3b) that drives the servo drive unit (5a, 3b);
5b) and a servo controller for positioning (6a,
6b) and servo parameters for initial setting (7a, 7
2. The drive control device for a conveyor in a veneer cross-cutting machine according to claim 1, further comprising a sequencer (8) for command control. 3. Between the rows of the carry-in conveyor (2a), use a narrow veneer (1)
Claim 1, characterized in that a veneer detector (9) is installed to be able to detect the cut point of the veneer, and the veneer detector (9) is connected to a sequencer (8) of the digital control circuit (4). Conveyor drive control device for veneer horizontal stripping machines. 4. Clipper (1) for cutting the narrow veneer (1) to the specified width.
0) crankshaft (11) and the clipper (10)
Each of the crankshafts (13) of the waste separation conveyor (12) installed between the conveyor and the discharge conveyor (2b) is equipped with an intermittent drive mechanism (14a) consisting of an electromagnetic clutch brake, a servo motor, a pneumatic cylinder, a hydraulic cylinder, etc.
, 14b) in a veneer cross-cutting machine according to claim 1.