JPH02241702A - Conveyance controlling device in veneer cutter - Google Patents

Abstract

PURPOSE:To precisely cut the boundary of veneer at all times by a method wherein the outputting timing of the stop signal of a conveying device is automatically corrected on the basis of the result of the measured slippages of friction type solenoid clutch brakes. CONSTITUTION:In order to stop the detected boundary of veneer at its stop position just beneath a cutting device, the optimum outputting timing of stop signal sent from the delay circuit 12 of a control unit 11 is set and slippages during the period from the receipts of stop signals on respective solenoid clutch brakes 9a and 9b to the stoppages of conveying device are measured by measuring devices 10a and 10b and stored in an arithmetic storage circuit 13. Measurements with the measuring devices 10a and 10b are performed every time at the actuations of the solenoid clutch brakes 9a and 9b or at fixed intervals of time so as to store the results of the measurements in the arithmetic storage circuit 13 and, at the same time, to take the average of a plurality of the measured values so as to compare with the optimum value, which is stored first. When the result of the comparison exceeds the allowable amount of change, the stop signal outputted from the delay circuit 12 is automatically corrected in proportion to the amount of change from the optimum value so as to delay the outputting timing to the solenoid clutch brakes 9a and 9b. Thus, the boundary of the veneer can be precisely cut at all times.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a cutting machine that cuts veneers to a certain length used in a plywood manufacturing process, and is driven intermittently using a friction type electromagnetic clutch brake. The present invention relates to a device that controls the transportation of veneers by a transportation device.

[Prior Art] A veneer conveyance control device in a conventional veneer cutting machine uses a well-known shift register, The output timing is delayed by the time determined by the distance between the detection device and the cutting device by a delay circuit composed of a magnetic memory, etc., and the output timing is stopped when the boundary of the veneer is directly below the cutting device.1: The drive of the conveyance device consisting of the loading and unloading conveyors, each of which uses a friction type electromagnetic clutch brake, is controlled so as to perform the following steps.

[Problem 8 to be solved by the invention] In the conventional conveyance control device, the drive of the conveyance device is controlled by the operation of a friction-type electromagnetic clutch brake gear, so the period of use becomes long and the frequency of use is reduced. When the number of veneers increases, the brake plate of the friction-type electromagnetic clutch brake wears out, and the time from receiving a stop signal from the control device until the conveyance device stops increases. There is a drawback that the stopping position of the boundary is not directly under the cutting device, but stops after passing the cutting device, making it impossible to cut accurately.

In other words, a veneer sizing cutting machine cuts and removes defective parts such as missing or irregularly shaped parts at the front and back of the veneer, knots, holes, thick and thin parts inside the middle board, etc. For example, when cutting a defective part on the front edge of a veneer, a detection device detects the boundary between the valid part and the defective part of the veneer that is brought in, and the machine cuts the veneer at this boundary. The output timing is determined by the distance between the detection device and the cutting device, the feed speed of the conveyor, and the amount of slippage of the brake plate of the electromagnetic clutch brake so that the boundary stops directly below the cutting device. is delayed, a stop signal is transmitted to the electromagnetic clutch brake used on the loading conveyor, and the boundary of the veneer is stopped at a predetermined position directly below the cutting device.
It will be cut to a certain extent at the boundary.

11. 17. When the brake plate of the electromagnetic clutch brake wears out and comes to a stop, the slipping distance from stop + to - (the carry-in conveyor stops from C after receiving No. 8) increases, and the boundary of the veneer plate reaches the specified stop. It stops after passing the position, and the effective portion of the veneer is also cut and removed in excess, resulting in a decrease in veneer yield.

In addition, when cutting the defective part of the trailing edge of the veneer to length,
As in the case of sizing cutting of the leading edge, the boundary detected by the wear of the brake plate of the electromagnetic clutch brake I/- key passes through the predetermined stop position and then stops L, and the defective part is included and cut to sizing. , resulting in a decrease in the quality of the intermediate plate.

Therefore, in order to always perform highly accurate and accurate dimensional cutting without degrading the veneer yield or quality, the wear condition of the brake plate of the electromagnetic clutch brake should be investigated, and the delay circuit should be cut according to the wear condition of the brake plate of the electromagnetic clutch brake. It is necessary to correct the output timing of the stop signal to the electromagnetic clutch brake.

To correct this, conventionally, the scrap veneer from the defective part that has been cut and removed has been collected from time to time to check whether the veneer has been cut accurately at the boundary, and if it is inaccurate, the delay circuit has to be adjusted manually. After correcting the output timing of the stop signal, it was necessary to repeat the trial and error process of cutting again and readjusting based on the results. This method has very poor workability because it is done manually, and it also leads to a decrease in productivity because it is performed with the machine stopped, and it is also troublesome that one must always pay attention to the timing of correction.

Even if the brake plate of a friction-type electromagnetic clutch brake wears, the output timing from the delay circuit is automatically corrected according to changes in slippage due to wear, and the boundaries of the veneer are always cut accurately. The object of the present invention is to provide a conveyance control device that stops at a predetermined position directly below the device.

[Means for Solving the Problems] In order to achieve the above object, in the conveyance control device of the present invention, the output shaft of the friction type electromagnetic clutch brake used in each of the conveyance devices, which are the loading and unloading conveyors. The device consists of pulse pickup, rotary encoder, rotary intact cylinder, rotary magnetic scale, and other angle measurement devices.Each electromagnetic clutch brake is operated from the time the latch brake receives a stop signal until the conveyance device stops. An arithmetic storage circuit that measures the amount of slippage with the measuring device, stores and calculates the result, and a correction circuit that automatically corrects the output timing of the stop signal from the delay circuit to the electromagnetic clutch brake based on the signal from the arithmetic storage circuit. is installed in the control device.

[Function] In the control device of the present invention configured as described above, first, the stop signal from the delay circuit of the control device is optimized so that the detected boundary of the veneer stops at the stop position directly below the cutting device. At the same time as setting the output timing, the amount of slippage of each electromagnetic clutch/brake from when each electromagnetic clutch/brake receives a stop signal until the conveyance device stops is measured using each n1 constant device. The resulting numerical value is stored in the arithmetic storage circuit.

Furthermore, the allowable amount of change when changing from this optimum value is also set in the arithmetic storage circuit. Measurements using this measuring device are performed every time when cutting, that is, when the electromagnetic clutch brake is activated to stop the conveying device, or at regular intervals, and the results of these multiple measurements are stored in an arithmetic storage circuit, and the multiple values are averaged. and compare it with the first memorized optimal value.

If the result of this comparison exceeds the set allowable change amount, the stop signal output from the delay circuit is automatically corrected according to the change amount from the initially stored optimal value. Delays the output timing to the electromagnetic clutch brake,
The conveying device is controlled so as to stop the veneer directly below the cutting device so that the veneer is always cut accurately at the boundary between the valid portion and the defective portion.

[Embodiment] An embodiment of the control device of the present invention will be described with reference to the drawings. In Fig. 1, a phototube, a microswitch, a differential transformer, etc., which detect the boundary between the valid part and the defective part of the veneer A, are placed near the end of the conveyor 1, which carries the veneer A, and has a plurality of endless belts. A detection device 2 configured by one or a combination of these is installed. Following the carry-in conveyor 1, the veneer A is cut to size based on a signal from the detection device 2, and the veneer A is cut to size by a device consisting of a receiving blade 3, a knife 4, and an actuation mechanism 5. A carry-out conveyor 7 with a plurality of endless belts for carrying out A is installed.

Furthermore, in order to drive the carry-in conveyor 1 intermittently, a first electromagnetic clutch brake 9a that transmits the power of a first drive mechanism 8a such as an electric motor is installed, and the output shaft of the first electromagnetic clutch brake 9a is connected to the entry side. A pulse pickup is installed as the n1 constant device 10a. Similarly, in order to drive the unloading conveyor 7 intermittently, a second electromagnetic clutch brake 9b that transmits the power of a second drive mechanism 8b such as an electric motor is installed, and the output shaft of the second electromagnetic clutch brake 9b is connected to an output shaft for the output side. A pulse pickup is installed as the measuring device 10b.

In FIG. 2, the control device ti includes the above-mentioned cutting device 6.
operating mechanism 5 and first and second electromagnetic clutch brakes 9a. This is installed to control the activation signal to 9b. This control device 11 includes a shift register, C
It is composed of a delay circuit 12, an arithmetic storage circuit 13, an input side correction circuit 14a, an output side correction circuit 14b, and an output circuit 15, each of which includes a PU, a storage device, and the like.

The delay circuit 12 receives a detection signal from the detection device 2 that detects the boundary between the valid portion and the defective portion of the veneer A, and the boundary of the veneer A stops directly under the blade 4 of the cutting device 6, and is cut. The stop signal of the conveying device is delayed by an optimal time initially set, and then the input side correction circuit 14a or the output side correction circuit 1
4b to the output circuit 15 and the cutting device 6.
A signal for operating the operating mechanism 5 of the input side correction circuit 14a
Alternatively, it is transmitted to the output circuit 15 via the output side correction circuit 14b.

The arithmetic storage circuit 13 outputs a first or second signal from the output circuit 15.
Simultaneously receives the actuation signals output to the electromagnetic clutch brakes 9a and 9b of the
．． 10b starts capturing pulses from the pulse pickup, counts the number of pulses until the carry-in conveyor 1 and the carry-out conveyor 7 stop, and memorizes the number of pulses. The process is performed multiple times and the stored values are averaged to determine whether the first or second electromagnetic clutch/brake 9a. 9b, and compare it with the optimal value stored in advance. If the amount of change is greater than the set allowable amount of change, set the value according to this change shop for the entry side. is to input 1-('' to the output side correction circuits 14a and 14b, respectively.

Is the input side correction circuit 1.4a and the output side correction circuit 141) 7, respectively? The signal from the delay circuit 12 is corrected in accordance with the corrected value outputted from the fL calculation storage circuit 13, and the output timing of the stop signal is delayed and outputted to the output circuit 15. At the same time, the operating signal of the operating mechanism 5 of the cutting device 6 is also outputted to the output circuit 15 with correction I~.

The output circuit 15 includes an input side correction circuit 14a, an output side correction circuit 14a,
14b, a signal is transmitted to activate the first and second electromagnetic clutch brakes 9a and 9b and the actuation mechanism 5 of the cutting device 6, and the first and second electromagnetic clutch brakes When transmitting the signal OX to the brakes 9a, 91], the signal is also transmitted to the arithmetic storage circuit 13 at the same time.

In addition to the above-mentioned embodiment, a function is added to issue an alarm, etc. to notify the need for readjustment or replacement of the electromagnetic clutch/brake when the measured amount of slippage of the electromagnetic clutch/brake exceeds a constant temperature. ) can be done. In addition, a part of the rear part of the unloading conveyor is rotatable, so that it can be used to store scraps cut to size.
It is also possible to install a layer separation mechanism for discharging the l plate to the outside of the machine.

The control device of the present invention can also be applied to a splintering machine that converts irregular length small and medium-sized veneers into regular-length cross-split veneers.

[Effects of the Invention] Since the present invention is configured as explained below, it produces the effects described below.

By measuring the slippage of the friction-type electromagnetic clutch 12 and automatically correcting the output timing of the stop signal of the conveying device based on the result, the detected boundary of the veneer can always be accurately cut. 2 = Accurate cutting allows effective use of a single cut using a conventional control device? , :
: Although the amount of loss of J41 board is only a few degrees, it is a very large improvement in the yield of veneer in the current situation where veneer is cut tens of thousands of times per day.

In addition, defective parts on the trailing edge of the veneer can be completely removed, improving veneer quality12 and contributing to smoother work in the post-process.
The quality of the final product can also be improved.

In addition, the correction by this correction circuit is automatically performed, eliminating the need to investigate the cut waste veneer, stop the machine, and manually correct the delay circuit as in the past, and eliminate the need for correction. Since there is no need to frequently check the presence or absence of

Furthermore, it is possible to add a function that issues an alarm when the amount of slippage of the electromagnetic clutch brake exceeds a certain value, so that it is possible to know with certainty when the electromagnetic clutch brake should be readjusted or replaced.

Since the control device of the present invention has a simple configuration that does not require large-scale equipment, it is possible to install this control device by modifying an existing cutting machine, which is very effective in terms of machine utilization. It is something.

[Brief explanation of drawings]

FIG. 1 is a schematic side view showing an embodiment of the present invention, and FIG. 2 is a schematic diagram showing an internal circuit of a control device. DESCRIPTION OF SYMBOLS 1... Carrying-in conveyor, 2... Detecting device, 6... Cutting device, 7... Carrying-out conveyor, 9a, 9b... 1st
and a second electromagnetic clutch brake, lOa...inlet side measuring device, 101)...outlet side measuring device, 11...
Control device, 12...Delay circuit, 13...Arithmetic storage circuit, 14a...Input side correction circuit, 141]...Output side correction circuit, I5...Output circuit, A... Single board.

Claims (1)

[Claims] A carry-in conveyor that is intermittently driven using a friction-type electromagnetic clutch brake to carry in veneers, a detection device that detects a boundary between a valid part and a defective part of the veneer being carried in and outputs a detection signal, and the veneer. a cutting device that cuts the veneer to size; a carry-out conveyor that is intermittently driven using a friction-type electromagnetic clutch brake to carry out the cut veneer; Controlling the drive of the carry-in conveyor so as to stop the boundary between the valid part and the defective part of the board directly below the cutting device, actuating the cutting device, and driving the carry-out conveyor to carry out the cut veneer to a certain extent. In a veneer cutting machine comprising a control device that outputs a signal to control driving, the friction type electromagnetic clutch brake installed on each of the loading and unloading conveyors receives a stop signal output from the control device and then First and second measuring devices are installed to measure the amount of slippage of each electromagnetic clutch and brake until the conveyance of the loading and unloading conveyors stops, and the measurement results by the first and second measuring devices are stored and calculated. and a correction circuit that automatically corrects the output timing of the stop signal output from the control device to the loading and unloading conveyors based on the measurement results, the controller is characterized by being installed in the control device. Conveyance control device for veneer cutting machine.