JPS6241082B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a veneer veneer sizing cutting device, particularly a veneer veneer sizing cutting device capable of automatic selective cutting. This method selectively cuts defective parts such as cracks that exist in veneers (veneers) only for those with dimensions that are larger than a preset value, and does not cut defective parts that are smaller than the set value. We provide a size cutting device, and use it to determine the purpose of use of the veneer after cutting.
Or, depending on the distinction between regular cuts and temporary cuts (rough cuts), by not cutting defective areas of a certain width or less that exist in the veneer, the yield due to cutting of defective areas can be minimized. It is in.

Now, the veneer obtained by cutting raw wood with a cutting device such as a veneer lace or slicer usually has defective parts (waste parts) such as irregular shapes or insufficient thickness at the front and rear ends, and the central part. There are also defective parts such as dry cracks, water cracks, and cracks due to drying shrinkage (hereinafter simply referred to as cracks). After all of these defective parts are cut by a sizing cutting device, they are removed manually or mechanically, and the remaining valid parts are cut into veneers with a sized width that is less than the standard size. The reality is that they are joined to a certain size through a horizontal splicing process and then put into use. However, such conventional sizing cutting equipment detects defective parts of veneers using a plurality of veneer detectors and discrimination circuits installed on the conveyor.
The cutting blade is always operated in synchronization with the detection signal issued from the discrimination circuit (through a delay circuit), so that the defective part and the valid part can be cut and separated. Therefore, cutting is performed uniformly regardless of the size of defective parts, especially cracks. Therefore, not only is the yield significantly reduced, but in addition, in a sizing cutting device that temporarily stops transporting the veneer during cutting, the throughput is also significantly reduced.

On the other hand, in the case of temporary cutting processing of green veneer before drying, in order to prevent a decrease in yield due to cutting, the delay circuit is improved and the detection signal is given a different time, and the effective part and It is common practice to cut the veneer with the defective part still included in the valid part without cutting accurately at the boundary with the defective part, but as mentioned above, there are There may be a defective crack near the center, and in this case, the knife always performs a cutting operation regardless of the width of the crack, so the above objective cannot be fully achieved.

Therefore, in order to solve the problems of the conventional device, the present invention further improves the delay circuit in the conventional sizing cutting device so that after the discriminator circuit issues a trailing edge detection signal, the next leading edge detection signal is emitted. A veneer unit that can be automatically selectively cut is characterized in that the trailing edge detection signal and the next leading edge detection signal are not transmitted to the operating mechanism of the cutting device under conditions where the time until the cutting process is shorter than a preset time. It is an object of the present invention to provide a sizing cutting device for plates so as not to cut cracks smaller than a predetermined width, thereby minimizing the reduction in yield. Here, the term "delay circuit" refers to all the circuits interposed between the discrimination circuit and the control circuit that controls the operating mechanism of the cutting device.

An example of implementation of the present invention will be described below with reference to the drawings.

The sizing cutting device illustrated in FIG. 1 is similar to conventionally known sizing cutting devices, in which a blade receiver 3 such as an anvil roll or a fixed blade is provided between an incoming conveyor 1 and an outgoing conveyor 2, and the incoming conveyor 1 On the way, veneer detectors 4 (4A, 4B, 4C,
4D), and above the blade receiver 3 is a cutting knife (hereinafter referred to as (referred to as a cutter) 5 is provided so that it can be raised and lowered freely. Reference numeral 6 designates the operating mechanism of the cutter 5, for example, one that uses a link to operate an air cylinder with an electromagnetic valve, or one that operates with a cam or a rod attached to an eccentric wheel on a shaft that can be driven intermittently by a clutch brake. Appropriate means known in the art are employed.

Since the sizing cutting device has a structure in which the blade 5 moves up and down relative to the blade receiver 3, the conveyance of the veneer must be temporarily stopped when cutting the veneer. , 2 is usually connected to an intermittent drive device such as a clutch brake.
For example, in the case of a running cut type sizing cutting device, the intermittent drive device is not necessary.

Each detector 4 (4A
The contacts 4a, 4b, 4c, and 4d (4D) are connected in parallel and are maintained as normally closed contacts, and constitute a discrimination circuit for discriminating defective parts at the front and rear ends of the veneer. Therefore, due to the entrance of the single plate S, all the detectors 4A, 4B, 4C, 4
When D performs the detection operation, all contacts 4a, 4b, 4
c and 4d are open, so the electrical output is OV
(hereinafter expressed as 0), and the output of OR element 7 is
The signal is transmitted from the NOT/OUT terminal 7a. Furthermore, if even one of the contacts 4a to 4d, which was once opened, becomes closed again due to the veneer S being transported, the electrical output becomes 12V (hereinafter referred to as 1), and the OUT terminal of the OR element 7 Output "1" is transmitted from 7b. In this way, the input signal of the OR element 7 changes each time depending on the detection of the front edge or the rear edge of the veneer, so the former signal is used as a detection signal for cutting the front edge, and the latter signal is used as a detection signal for cutting the rear edge. Each can be used as To explain such a detection operation using the veneer shown in FIG.
F is detected as the boundary between the defective part and the effective part at the rear end of the veneer, and these lines serve as the cutting points, and the defective parts at the front and rear ends and the crack defective part in the center of the veneer S are A1, B1, D1, It is separated as F1.

Reference numeral 8 denotes a pulse transmitter, which is installed on the rotating shaft of the carry-in conveyor 1 and configured to transmit a pulse number proportional to the feed amount. 9 is an AND element,
Based on the front end detection signal and the pulse signal from the pulse generator 8, a pulse output (front end cutting signal) is generated. 10 is a variable regulator provided for achieving the purpose of the present invention, which utilizes a timer or a pulse counter. 11 is a flip-flop (hereinafter referred to as memory); 12 is an AND element; when the rear end detection signal is stored in the memory 11 via the regulator 10, the output signal from the AND element 12 and the pulse generator 8 are output; A pulse output is generated by the pulse signal. Numerals 13 and 14 are pulse counters for cutting line correction, which count the number of output pulses output by the AND elements 9 and 12, and output when a preset value is reached. This correction means is used because the detection position (the position of the detector 4) that detects the boundary between the defective part and the effective part in the veneer is far from the cutting position (the position of the knife 5) where the veneer is actually cut. In principle, the cutter 5 performs the cutting operation with a delay of the time required for the detected line (line to be cut) on the veneer S to reach the cutting position by the cutter 5. However, since the outside of the detected line is normally used as the cutting line, the pulse counter for the front end is set to output earlier and the pulse counter for the rear end is set to output later. Next, 15 is a one-rotation control circuit (hereinafter referred to as a control circuit) that controls the operating mechanism 6 of the blade, and when cutting the front and rear ends, the blade 5 is rotated once every time a pulse output is generated from the pulse counter 13 or 14. It is configured to perform a cutting operation only once. That is, upon completion of the front end cutting operation, a reset signal is sent from the control circuit 15 to the pulse counter 13 via the wiring 15a, and upon completion of the rear end cutting operation, a reset signal is sent from the control circuit 15 to the pulse counter 13 via the wiring 15b. A set signal is sent to pulse counter 14 and memory 11, and these signals are alternately switched and applied to pulse counters 13 and 14.

In addition to the cutting signals from the front and rear ends, the control circuit 15 detects whether the blade has been operated by a detector (not shown) such as a limit switch or a proximity switch provided on the blade 5 or the drive shaft driven by a clutch brake or the like. It is wired to detect and apply that signal, but the details are omitted.

Further, the variable regulator 10 may be either a timer or a pulse counter, but in particular, when a pulse counter 10a is used, as shown by the two-dot chain line in FIG. The AND element 10b is interposed, and the OR element 7 is
The OUT terminal 7b is connected to the input side of the AND element 10b, and the NOT/OUT terminal 7a is connected to the reset terminal of the pulse counter 10a.

Next, what is illustrated in FIG. 5 is an embodiment in which a pulse counter 17 is provided outside the pulse counters 13 and 14, and the rear end cutting signal and the rear lines C and E of cracks G and G1 ( (corresponding to the next front end detected line) and wiring 19, 20.
By sending the output signal to the AND element 18 via the AND element 18 and sending the output signal to the counter 17, for example, it is possible to cut even the dimension l in FIG. 4. In FIG. 5, the reset signal sent from the control circuit 15 is sent to the counter 17 via the wiring 15c. Further, in this embodiment, the pulse counters 13, 14, 17 are timers,
A timer such as a cycle counter or a magnetic tape synchronized with the transport speed may also be used, and can be freely adopted as appropriate and necessary.

In order to automatically eliminate defective parts, it is also possible to provide an opening/closing body between the carry-out conveyor and the blade receiver that opens and closes each time a cutting operation is performed. (Refer to Japanese Patent Publication No. 51-32873) The present invention is constructed as described above, and its functions are as follows.

When the front end defective part (line A in FIG. 2) of the veneer S being transferred by the carrying-in conveyor 1 is detected by the veneer detector 4 and the discrimination circuits 4a to 4d, the detection signal is outputted via the OR element 7 to the AND is transmitted to element 9, and the corresponding
A pulse signal is emitted from the output side of the AND element 9, and this signal is delayed by the pulse counter 13 and sent to the control circuit 15. It is activated and the front end of the veneer S is cut in the usual way. Next, if the veneer S moves and there is a crack G as shown in Figure 2, for example, the position of line B is detected as the cutting line at the rear end, so a detection signal is emitted from the discrimination circuit, and the OR A signal is sent from the OUT terminal 7b of the element 7 to the input side of the variable regulator 10. Therefore, the regulator 10 is set in advance to a delay time X corresponding to the allowable size of cracks (width size of cracks that may be included in the product) depending on the intended use of the veneer. Therefore, if the crack is less than X, use adjuster 10.
If the signal transmitted from the output side of the regulator 10 cannot be obtained and there is a crack of X or more, the signal is transmitted from the output side of the regulator 10 with a delay, thereby cutting at the position of the line B. become. At this time, the pulse counter 14 is changed in accordance with the adjustment amount of the regulator 10. For example, if the delay time of the regulator 10 is lengthened, the number of counters set in the counter 14 will be decreased, and conversely, the number of counters set in the counter 14 will be reduced. If the delay time is shortened, the number of counters set for the counter 14 increases. In any case, the total delay time of the regulator 10 and pulse counter 14 becomes the delay time for cutting the rear end.

To explain this in more detail with reference to FIG. 3, first, the timer of the regulator 10 is set to a delay time X corresponding to the allowable size of the crack. If this is represented by the output voltage of the regulator 10, the input signal will be output from the regulator 10 with a delay of X time, as shown at 16. Therefore, when the detection signal (rear end detection signal) of the rear end cutting line B is applied to the regulator 10, if the dimension of the crack G is h, the crack G will pass within the time set by the regulator 10. do. That is, if the rear line C of the crack G, that is, the next front edge detection line, is detected before the set time X expires, the rear edge detection signal (output from the OUT terminal 7b) becomes 0, and the adjustment Since the internal timer is not timed up, no output is sent from regulator 10 and no disconnection occurs. (X>h) On the other hand, if the dimension of the crack G is the width of line B to line C1 (the dimension is h1), the adjuster 10
After the set time
An output signal is issued to the AND circuit 12 via the output terminal 1, and a rear end detection signal is transmitted to the actuating mechanism 6. When the blade 5 is operated once, a reset signal is applied to the memory 11 and the counter 14 via the wiring 15b.

As mentioned above, if cutting is not performed at the position of line B, the reset signal after cutting the front end continues to be applied to the counter 13 via the wiring 15a, so line C is continuously detected. However, you will not accidentally cut that part. Also line B
When cutting is performed at the position, the front edge reset signal is released when the cutting operation is completed, so that after the veneer detector 4 detects line C and has progressed to a certain extent, the front edge is detected by the counter 13. Counting of detection signals can begin. Therefore, as illustrated in FIG.
This problem can be solved to some extent by bringing the blade as close as possible to the cutter 5. However, there may be cases where this is difficult due to mechanical space constraints, and in such cases, it can be solved by configuring, for example, as illustrated in FIG. 5 above. That is,
If the next front end detection is performed before the rear end cutting operation is completed, a signal flows along with the wirings 19 and 20 in FIG. 5, and a signal "1" is output from the AND element 18.
By inputting the pulse to the pulse counter 17, which is set in advance to a smaller value than the pulse counter 13, the front end cutting operation is performed at the l dimension shown in FIG. At this time, the signal is also input to the pulse counter 13, but a reset signal is generated by the front end cutting operation and is not input to the control circuit 15.

Note that the defective end portion (line F) of the veneer S is cut in the usual manner.

As described above, in the present invention, the time from when a trailing edge detection signal is issued to when the next leading edge detection signal is issued is preset in a delay circuit that gives a predetermined time to the front and rear edge detection signals. By incorporating a control means that controls not to transmit the rear end detection signal and the next front end detection signal to the operating mechanism of the cutting device under conditions shorter than a set time, cracks smaller than the allowable size are not cut. Since it is possible to include it in the product and cut and remove only cracks larger than the allowable size as defective parts, the allowable size can be set according to the intended use of the veneer and whether it is a regular cut or temporary cut. If this setting is made, cracks existing in the veneer can be cut effectively and appropriately, unnecessary cutting can be significantly reduced, and the yield loss of the veneer can be minimized. Therefore, it is possible to sufficiently cope with the recent deterioration of the raw wood situation, and it is also possible to significantly improve the function of the conventional sizing cutting device, thereby greatly contributing to the rationalization of the plywood industry.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the present invention, and FIG. 1 is an explanatory diagram of the configuration and circuit of the device of the present invention, and FIG.
3 and 4 are explanatory diagrams of the operation of the device of the present invention, and FIG. 5 is a circuit diagram of another embodiment. S...Plywood veneer, 1...Incoming conveyor, 2...Outgoing conveyor, 4 (4a, 4b, 4c, 4d)...Single plate detection device, 5...Cutter, 7...OR element, 8...Pulse transmitter, 10...Variable Adjuster, 11...Memory (flip-flop), 13...Pulse counter for front end cutting line correction, 14...Pulse counter for rear end cutting line correction, 15...Control circuit.

Claims (1)

[Claims] 1. Both loading and unloading conveyors that transport veneer veneers, and a plurality of veneer detectors that are installed along the loading conveyor in a direction perpendicular to the conveyance direction and that detect the presence of veneer veneers or the presence or absence of a predetermined thickness. and a discrimination circuit that discriminates the detection signals emitted by the plurality of veneer detectors, detects the boundary between the defective part and the valid part of the veneer veneer, and issues detection signals for the front and rear edges, and the front and rear detectors. A delay circuit that adds a predetermined time to an end detection signal, and a cutting device that operates a cutting blade in synchronization with the front and rear end detection signals that are given a predetermined time by the delay circuit. In the sizing cutting device, the delay circuit contains the trailing edge detection signal and the trailing edge detection signal under the condition that the time from when the trailing edge detection signal is issued to when the next leading edge detection signal is issued is shorter than a preset time. A veneer veneer veneer veneer veneer veneer sheet sizing cutting device capable of automatic selective cutting, characterized in that it incorporates a control means for controlling so that the next front edge detection signal is not transmitted to the operating mechanism of the cutting device.