JPH0512122B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention cuts a narrow veneer having defective parts such as irregular edges, cracks, knot holes, etc. into sized pieces while being intermittently conveyed by a conveyor. At the same time, a veneer cross-splitting machine applies adhesive to the end surface or adheres adhesive thread to the board surface, joins each other into a cross-seam product in the form of a blind, cuts it to a fixed length, and stacks it. The present invention relates to a fixed-length cutting device for a veneer cross-cutting machine, which is applied to a veneer cross-cutting machine and improves the fixed-length cutting accuracy by performing correction cutting for the short length of the fixed length when cutting the cross-cutting products to a fixed length.

[Conventional technology]

A conventional conventional method for cutting a veneer to a fixed length in a veneer cross-splitting machine for improving the precision of cutting to a similar length is based on, for example, the method for cutting to a fixed length in a veneer cross-splitting process disclosed in Japanese Patent Publication No. 56-28682. ``A first detection process is provided on the conveyor to determine the normal end-face abutting position where the end faces of the narrow veneers are closely abutted against each other, and an intermittent drive device is installed that operates the knife from the first detection process. A second detection step is provided on the unloading side separated by a conveyance distance corresponding to the operation delay time or more, and determines the end face abutting position when cutting to a fixed size, and the fixed width of the jointed veneer cut horizontally in the form of a blind. A third detection step is provided on the transport conveyor to determine the amount of time, and a fourth detection step is provided on the carry-in side at a distance equivalent to the delay time of the intermittent drive device from the third detection step. When cutting the joint veneer that has been horizontally torn into a blind shape, the joint veneer is continuously transported within the conveying distance between the third detection step and the fourth detection step, while the joint veneer is cut with a knife. When cutting to a fixed size, the end surfaces of the narrow veneer are closely abutted at the position of the second detection step, and in normal conditions, the end surfaces of the narrow veneer are closely abutted at an arbitrary distance. ``A fixed-length cutting device for a veneer cross-cutting machine'' in which the veneer is conveyed by intermittent drive and the end faces of the veneer are brought into close contact with each other at the position of the first detection step.

[Problem to be solved by the invention]

However, the above-mentioned prior art device for improving the accuracy of cutting to a fixed length has two end face abutting positions to avoid the influence of speed fluctuations of the knife drive device using an intermittent drive device such as an electromagnetic clutch brake. Also, due to the switching control of the abutment position, the standard length clipper is limited to a continuous cutting method such as a roll clipper that can cut the veneer even while it is being transported. The above-mentioned prior art cannot be applied to a fixed-length cutting device in which the end faces abut at one position and which uses a fixed-length clipper of a vertically movable knife to cut intermittently.

Therefore, the above-mentioned intermittent cutting type fixed length cutting device is still affected by the speed fluctuation of the knife drive device using an intermittent drive device such as an electromagnetic clutch brake.
The biggest problem was that cutting errors to the standard length of several tens of millimeters caused a significant drop in veneer yield, and the quality of plywood production deteriorated due to the production of horizontally spliced products that did not meet the standard size. Therefore, in order to eliminate the drawbacks of these intermittent cutting type fixed length cutting devices, the present invention provides a fixed length cutting correction circuit in the digital control circuit of the servo motor that drives the loading and unloading conveyors. The correction circuit can correct the extrusion distance of the intermediate product that collides with the rear end of the side-seamed product, and automatically adds this to the standard length correction cutting for items that are likely to be short of the standard length. The purpose of this invention is to provide a fixed length cutting device for a veneer crosscutting machine.

[Means to solve the problem]

In order to achieve the above-mentioned object, the present invention provides a method for detecting the rear end of a side-separated product from the time when the rear-edge detector detects the rear end of the side-separated product until the time when the standard length detector detects the leading end of the side-sewn product. The moving distance C of the part is counted from the conveyance amount of the carry-out conveyor, and the counted value is added to the set value of the positioning distance B, and then the distance of pushing out by the carry-out conveyor of the intermediate product that collides with the rear end of the side-splitting product is calculated. A standard length correction circuit is installed in the digital control circuit of the servo motor that drives the loading and unloading conveyors so that D can be corrected to (D←B+C). A veneer horizontal stripping machine configured to perform a fixed length correction cut by adding a fixed length shortfall length E using a fixed length clipper each time the rear end of the horizontal stripping product is within the range of the coasting distance A. It is a length cutting device.

[Effect]

Since the present invention is configured as described above, as illustrated in FIG.
When the leading end of the side-separated product 3 is detected by the standard length detector 7, the coasting distance A between the trailing end detector 5 and the end face contact position Each time it exists within the range of , an insufficient length E will occur as shown in B in the figure, so count the moving distance C from the rear end detector 5 as shown in A in the figure, and calculate the counted value. is added to the set value of the positioning distance B between the standard length detector 7 and the standard length position Y, and then the intermediate product 8 is transferred to the conveyor for carrying out the intermediate product 8 that collides with the rear end of the side-separated product 3 as shown in C in the figure. The count value (D←B
+C) and then cut into a predetermined length L using a length clipper 6. Also, as shown in d in the figure, the tip of the side-separated product 3 is connected to the standard length detector 7.
When the rear end is detected by the rear end detector 5, the rear end is detected by the rear end detector 5.
The rear end of the side-separated product 3 that is joined at least in the form of a blind protrudes sufficiently in front of the rear end detector 5 without existing within the range of coasting distance A between When it is a normal long object, the normal cutting to a fixed length by the fixed length detector 7 and the fixed length clipper 6 determines the pushing distance D of the side-separated product 3 by the delivery conveyor as shown in E in the figure. B is made to perform the same count value (D←B).

Then, the pushing distance D of the intermediate products 8 and side-stripped products 3 by the above-mentioned carry-out conveyor is calculated by adding the moving distance C to the positioning distance B (D←B+
C) or the same count value (D←B) for the positioning distance B depends on the standard length cutting correction circuit installed in the digital control circuit of the servo motor that drives the loading and unloading conveyors. The fixed length cutting correction circuit automatically determines whether it is a count value (D←B+C) or a count value (D←B) by switching the correction mode as illustrated in the flowchart of FIG. The fixed length cutting device of the present invention equipped with the fixed length cutting correction circuit distributes the fixed length cutting error at least to the length of the fixed length dimension L or more, and makes it possible to cut plywood products. This is to strictly prevent the production of side-seamed products that do not meet the standard size L, which would significantly reduce the quality of the product.

Note that the above-mentioned standard-length cutting correction circuit is provided in the digital control circuit of the servo motor that drives the loading and unloading conveyors. Of course, it can be similarly applied to the knife drive device used, and in this case, the rear end detector 5 and the standard length detector 7 are included in the control circuit of the intermittent drive device such as the electromagnetic clutch brake. By inserting a counter device or the like for counting related to the digital control circuit, it is possible to replace this with the digital control circuit.

〔Example〕

FIG. 1 shows an example of the implementation of the present invention. First, the veneer horizontal stripping machine carries in a narrow veneer 1 having defective parts such as irregular edges, cracks, knot holes, etc. onto a conveyor 2a. It is possible to detect irregular edges of the narrow veneer 1 to be cut and separated, defective parts such as cracks, knot holes, etc. by thickness or shape between the rows of the carrying-in conveyor 2a while loading it on top and starting conveyance. A single plate detector 1 consisting of a limit switch, a photoelectric switch, etc. installed on the
2 and transmits the detection signal to the sequencer 13 of the digital control circuit 11.
3, the sized clipper 14 and the scrap divider 15 are activated to cut the intermediate product 8 of sized width, separate the swarf, and deliver it onto the carry-out conveyor 2b. On the other hand, on the carry-out conveyor 2b, there is a spot applicator 16 for applying an adhesive such as hot melt resin to the end surface of the intermediate product 8 during the conveyance process;
Thread nozzle 1 that feeds the adhesive thread impregnated with this onto the board surface
7 is constructed, and furthermore, the unloading conveyor 2b
Braking rail members 4a and 4b are connected to the exit side of the intermediate product 8 to apply a braking force to the intermediate product 8 during the extrusion process and join the intermediate product 8 to the cross-separated product 3 in the form of a blind. Further, the brake rail members 4a, 4b
The cross-cut product 3 in the form of a blind is cut into a desired fixed size L by a fixed length clipper 6, and is dropped and deposited at a predetermined location by a relay conveyor 18 and an opening/closing conveyor 19 to become a stacked product 20.
In the figure, 21 is a crankshaft that moves the sized clipper 14 up and down, 22 is a crankshaft that opens and closes the waste divider 15, and 23 and 24 are crankshafts 2
1 and 23, an intermittent drive mechanism consisting of a motor with an electromagnetic clutch brake, a servo motor, a pneumatic cylinder, a hydraulic cylinder, etc. capable of one-turn control and half-turn control; 25, the fixed-length clipper 6;
The crankshaft 26 that moves the crankshaft 25 up and down is an intermittent drive mechanism comprising a motor with an electromagnetic clutch brake, a servo motor, a pneumatic cylinder, a hydraulic cylinder, etc., which is capable of controlling the crankshaft 25 one rotation.

In addition, the drive control device for the carrying-in and carrying-out conveyors 2a and 2b in the veneer cross-cutting machine operates during an acceleration operation for re-conveying the previously cut narrow width veneer 1a by the carrying-in and carrying-out conveyors 2a and 2b. High productivity can be maintained by setting the acceleration time to be at least 40 ms or more and up to about 200 ms, preferably as short as possible without causing irregularities in the left and right conveyance amount of the narrow veneer 1a. It is possible to set a buffer acceleration time close to 40 ms, and the conveyor 2 for carrying in and carrying out the narrow veneer 1a to be cut next.
During the deceleration operation for positioning by a and 2b, deceleration positioning is performed for at least 80 ms or more and up to about 200 ms, preferably as short as possible without causing irregular disturbances in the left and right conveyance amount of the narrow veneer 1a. The loading and unloading conveyors 2a, 2b can set buffer deceleration positioning times close to 80ms to maintain high productivity and high positioning accuracy.
is configured to be driven intermittently by servo motors 10a, 10b and a digital control circuit 11. That is, the loading and unloading conveyor 2a is carried out in cooperation with the sizing cutting operation of the narrow width veneer 1 by the sizing clipper 14 and the scrap divider 15 of the veneer horizontal stripping machine of the present invention, and the chip separating operation.
The intermittent drive control by the servo motors 10a, 10b and the digital control circuit 11 of 2b is performed by the servo parameter memories 27a, 27b for initial setting built into the digital control circuit 11, for example.
An acceleration time of 40ms, a deceleration positioning time of, for example, 80ms, and a conveyance speed of, for example, 40m/min are preset, and then the loading and unloading conveyor 2
The servo motors 10a, 10b of servo motors 10a, 10b of
8b and the servo drive units 29a and 29b, the narrow width veneer 1 on the carry-in conveyor 2a resumes conveyance, and the veneer detector 12 detects irregular edges and cracks to be cut and separated. , a defective part such as a knot hole is detected, and the detection signal is transmitted to the sequencer 13 of the digital control circuit 11 and is sent to the servo parameter memories 27a, 27b, the servo controllers 28a, 28b, and the servo drive units 29a, 29b. Thus, the intermittent drive control of the servo motors 10a, 10b and the half-rotation control of the intermittent drive mechanism 24 mounted on the crankshaft 22 of the waste divider 15 are performed alternately.

Next, the operation control device for the fixed length clipper 6 and the carry-out conveyor 2b according to the present invention uses a fixed length cutting correction circuit 9 provided in connection with the sequencer 13 in the digital control circuit 11 to control the rear end detector 5.
has detected the rear end of the side-splitting product 3,
The movement distance C of the rear end of the side-separated product 3 until the standard length detector 7 detects the tip of the side-separated product 3 is counted from the conveyance amount of the carry-out conveyor 2b, and the calculated value is calculated. is added to the set value of the positioning distance B, and then the pushing distance D of the intermediate product 8 collided with the rear end of the side-separated product 3 by the carry-out conveyor 2 is calculated as a counted value (D←B+C).
The servo motor 10b that drives the carry-out conveyor 2b connected to the digital control circuit 11 and the fixed-length clipper 6 are operated intermittently. The drive mechanism 26 is actuated alternately, and at least the standard length cutting error is distributed over the lengths longer than the standard size L, thereby reducing the quality of the plywood products that are less than the standard size L. The production system strictly prevents this.

〔Effect of the invention〕

As explained above, the present invention provides a standard length cutting correction circuit in the digital control circuit of the servo motor that drives the loading and unloading conveyors, and the standard length cutting correction circuit causes impact on the rear end of the side-separated product. A fixed-length cutting device for a veneer horizontal stripping machine that can correct the extrusion distance of intermediate products to be combined, and automatically performs fixed-length correction cutting by adding this length when there is a risk of insufficient length. Therefore, due to the influence of speed fluctuations of the knife drive device using an intermittent drive device such as an electromagnetic clutch brake, which occurred in this type of intermittent switching method fixed length cutting device according to the prior art,
The implementation effect was to reduce the standard length cutting error of up to mm to within a few mm, and to completely eliminate the problem of significant quality deterioration in plywood manufacturing due to the production of side-seamed products that did not meet the standard size. This is extremely remarkable.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a fixed length cutting device of the present invention;
FIG. 2 is a flowchart of the fixed length cutting correction circuit, and FIG. 3 is a diagram showing the mode of fixed length cutting. 1...Small veneer, 2a...Incoming conveyor, 2b
...Discharge conveyor, 3...Horizontal stripping product, 4a, 4
b... Brake rail member, 5... Rear end detector, 6...
...Standard length clipper, 7...Standard length detector, 8...Intermediate product, 9...Standard length cutting correction circuit, 10a, 10b
... Servo motor, 11 ... Digital control circuit,
A...Coasting distance, B...Positioning distance, C...Movement distance, D...Extrusion distance, E...Length short of standard length, L...Standard size, X...End face meeting position, Y …
...Standard position.

Claims (1)

[Claims] 1 Carrying in and carrying out the narrow veneer 1 on a conveyor 2a,
In the veneer cross-seam machine that cuts the veneer to a certain width while being intermittently conveyed by the veneer 2b, and joins each other to a blind-like cross-seam product 3, cuts it to a fixed length, and stacks it,
In order to be able to detect the rear end of the cross-cut product 3 pushed out by the carry-out conveyor 2b and stopped at the end abutting position X of the rear ends of the brake rail members 4a, 4b, an appropriate position is moved from the end abutting position X. A rear end detector 5 installed on the carry-in side with a coasting distance A apart, and a standard length clipper 6 installed on the conveyor line by detecting the leading end of the cross-cut product 3 in the form of a blind, are used to set a predetermined standard size L. A fixed length detector 7 is installed on the carry-in side at a predetermined positioning distance B from the fixed length position Y so that it can be cut at each time.
and the side-separated product 3 from the time when the rear end detector 5 detects the rear end of the side-sewn product 3 to the time when the standard length detector 7 detects the leading end of the side-sewn product 3. The moving distance C of the rear end portion is counted from the conveyance amount of the carry-out conveyor 2b, and the counted value is added to the set value of the positioning distance B, and then the intermediate material that collides with the rear end portion of the side-separated product 3 is calculated. A fixed length cutting correction circuit 9 capable of correcting the pushing distance D of the product 8 by the carry-out conveyor 2b to (D←B+C)
is provided in the digital control circuit 11 of the servo motors 10a, 10b that drive the loading and unloading conveyors 2a, 2b, and when the tip of the horizontally spliced product 3 is detected by the standard length detector 7, the horizontally spliced product 3 is Each time the rear end of the product 3 is within the range of the coasting distance A, the fixed length clipper 6 performs a fixed length correction cutting by adding a fixed length short length E. A fixed-length cutting device for a board horizontal stripping machine.