JPH0512121B2 - - 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 collision mitigation device for a veneer cross-splitting machine, which is applied to a veneer cross-splitting machine, and which alleviates the collision force generated when the end faces of the cross-splitting product and its intermediate product collide.

[Conventional technology]

Conventional devices for mitigating the collision force generated when the end faces of a side-separated product and its intermediate product collide include, for example, Japanese Patent Publication No. 61-54566; A conveyor that forcibly feeds the board at a predetermined speed in a direction perpendicular to its fibers, and a conveyor that has an axis that roughly coincides with the conveyance direction of the incoming conveyor, and a conveyor that has an axis that roughly matches the conveying direction of the incoming conveyor. The veneer is provided with a spiral propulsion member that applies a propulsion force to the veneer at a speed slower than the predetermined speed in the direction and allows the veneer to slide freely, and is installed vertically oppositely to form a nipping and conveying path for the veneer following the carry-in conveyor. a spiral rotating roller consisting of a plurality of sets of rotating rollers, an intermittent drive mechanism that rotates the spiral rotating roller intermittently, and a veneer detector provided on the carrying-in conveyor; A veneer end face matching device that operates the intermittent drive mechanism based on a veneer detection signal,” and a veneer end face meeting device that operates the veneer with its A carrying-in section that forcibly feeds the veneer in a direction perpendicular to the carrying-in section, and a plurality of upper and lower rotating rollers each having an axis that roughly coincides with the conveying direction of the carrying-in section create a free-running clamping conveyance path for the veneer that continues to the carrying-in section. The veneer is formed of a pressure part formed in the veneer, and the veneer forcibly fed by the carry-in part collides with the preceding veneer stopped at the pressure part near the position where the force-feeding force of the carry-in part disappears. An end face matching device is disclosed. To summarize the above-mentioned prior art, the above-mentioned veneer end face meeting device uses the conventional sliding friction using a braking rail member as a means to alleviate the collision force generated when the end faces of a side-separated product and its intermediate product meet. Instead of the resistance method, by using multiple rotating rollers whose axes are roughly aligned with the conveying direction, the collision force generated when the end faces of the side-separated product and its intermediate product collide can be absorbed by the rotating rollers. The purpose of the present invention is to provide a collision mitigation device that uses a kinetic friction resistance method that uses relatively small frictional resistance due to kinetic friction, and is applicable mainly to end-face collisions of thin veneers and brittle veneers with small allowable collision forces. It is something.

[Problem to be solved by the invention]

However, the collision mitigation device using rotating rollers of the above-mentioned prior art can reduce the collision force generated when the end faces of the side-separated product and the intermediate product collide with each other by reducing the relatively large sliding friction resistance caused by the conventional braking rail member, etc. , instead of the relatively small motion frictional resistance of rotating rollers, the collision force is alleviated by the difference in frictional resistance, and this is applied to the end-face collision operation of thin veneers and brittle veneers, which have a relatively small allowable collision force. However, even with the operating frictional resistance of the rotating rollers mentioned above, if the conveying speed increases more than that, for example, the usual conveying speed of about 30 m/min can be increased by about 50% to increase productivity. If this were the case, the collision force would naturally increase, causing problems in conveyance due to buckling of the material and product defects as a result.There remained a problem in the original end face collision operation. What is even more important here is that the collision force generated when the end faces collide appears as coasting on the side-separated product side with large inertia, causing damage to the side-separated product and the intermediate product joined to it. Due to the inertia of the rear-end collision, irregular gaps were formed at the edge abutting areas where the adhesive such as hot melt had not yet hardened, resulting in poor bonding, so the end abutting areas were closely bonded. It is not possible to safely and reliably produce high-quality cross-seam products in the form of blinds, since this type of rotating roller requires braking reinforcement measures that are contradictory to braking alleviation measures that merely reduce frictional resistance. This has serious drawbacks.

Therefore, in response to a strong desire in this industry to improve productivity by increasing the conveyance speed in horizontal stripping work, the present invention has been developed to meet the recent strong demand in this industry to improve productivity by increasing the conveyance speed in horizontal stripping operations. A new two-speed switching type veneer horizontal stripping machine that eliminates the risk of conveyance problems due to buckling of the material at the edge abutting area with the product, product defects due to this, and joint defects due to the formation of gaps. The purpose is to provide a collision mitigation device for.

[Means to solve the problem]

In order to achieve the above objects, the present invention provides: a. A speed switch is provided in the digital control circuit of the servo motor so that the conveyance speed of the loading and unloading conveyors can be switched in two stages, high and low.

b. A single plate detector is installed at an appropriate detection distance so as to be able to detect the leading end of the intermediate product arriving immediately before the end face meeting position formed at the connection part with the brake rail member connected to the carry-out conveyor. What I did.

The veneer is configured to switch the conveyance speed of the intermediate product from high speed to low speed each time the intermediate product arrives within the detection distance to alleviate the collision force with the side-separated product generated at the end face abutting position. This is a collision mitigation device for side-cutting machines.

[Effect]

Since the present invention is constructed as described above, FIG. 2 shows the case of one end-face abutment operation that occurred during one sizing operation of a narrow veneer, and the two-speed switching method And as illustrated as the conveyance characteristics of the unloading conveyor, the speed is always high H,
For example, when an intermediate product that has been conveyed at a high speed of about 45 m/min arrives just before the end face abutment position with the side-separated product formed at the connection part with the brake rail member connected to the carry-out conveyor, the intermediate product The conveyance speed of the loading and unloading conveyors is increased to the high speed by the tip detection signal transmitted by the single plate detector installed at an appropriate detection distance, for example, about 20 mm, so as to be able to detect the tip of the product. The speed is changed from H to a low speed L, for example, about 30 m/min, and the intermediate product is conveyed at low speed to the edge abutment position where the side-separated product is stationary. After a buffering collision operation is performed by low-speed conveyance, the normal high-speed H conveyance operation is automatically resumed. From high speed H above to low speed L
The two-speed automatic switching from low speed L to high speed H is automatically performed by linking the single plate detector to a speed switch installed in the digital control circuit of the servo motor mounted on the loading and unloading conveyor. A two-stage switching operation between high and low speeds is performed. In addition, when switching from high speed H to low speed L, and from low speed L to high speed H, as shown in the figure, the deceleration characteristics of the buffer deceleration positioning time T1 of the loading and unloading conveyors when cutting narrow veneer to size similar,
For example, the buffer deceleration time T2 is similar to the deceleration characteristic of 80 ms to about 200 ms, and the acceleration characteristic is similar to the buffer acceleration time T3 during the above-mentioned cutting.
A buffer acceleration time T4 similar to the acceleration characteristic of 40 ms to about 200 ms is set by the digital control circuit of the servo motor, and when the two-speed automatic switching is carried out, Care has been taken to prevent irregular sheet shifting due to impactful acceleration and deceleration acting on the intermediate products being transported.

In addition, the conveyance speed set to about 45 m/min for the high speed H illustrated above has been implemented for a long time.
Since it is 50% faster than the normal conveyance speed of about 30 m/min, it is an economical speed that is expected to significantly improve productivity as horizontal stripping work becomes faster. The conveyance speed set at approximately 30 m/min is based on the safe speed that has been used in the past, which is appropriate for the material and shape of the narrow veneer, and the safety of the conveyance work has been empirically proven. However, it goes without saying that the present invention is not limited only to the above-mentioned speed.

〔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
0 and transmits the detection signal to the sequencer 11 of the digital control circuit 5.
Then, the sized clipper 12 and the waste divider 13 are respectively 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 14 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
5 is constructed, and furthermore, the unloading conveyor 2b
Braking rail members 7a and 7b 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 7a, 7b
The cross-cut product 3 in the form of a blind is cut into a desired fixed size by a fixed-length clipper 16 and a fixed-length detector 17, and is dropped and deposited at a predetermined location by a relay conveyor 18 and an opening/closing conveyor 19 to form a stacked product. It becomes 20. In the figure, 21 is a crankshaft that moves the sized clipper 12 up and down, 22 is a crankshaft that opens and closes the waste divider 13, and 23 and 24 are devices that can control the crankshafts 21 and 22 by one rotation and half a rotation. an intermittent drive mechanism consisting of a motor with an electromagnetic clutch brake, a servo motor, a pneumatic cylinder, a hydraulic cylinder, etc.; 25 is a crankshaft for vertically moving the fixed length clipper 16;
is an intermittent drive mechanism consisting of 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 is maintained by setting an acceleration time of at least 40 ms 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 carrying-in and carrying-out conveyor 2 of the narrow veneer 1a to be cut next.
During deceleration operation for positioning by a and 2b,
High productivity and high positioning are achieved by setting the deceleration and positioning time to be at least 80 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. The loading and unloading conveyors 2a, 2 can set buffer deceleration positioning time close to 80ms to maintain accuracy.
b is intermittently driven by servo motors 4a, 4b and a digital control circuit 5. That is, the loading and unloading conveyors 2a, 2b are carried out in cooperation with the sizing cutting operation of the narrow width veneer 1 and the chip separation operation by the sizing clipper 12 and scrap divider 13 of the veneer horizontal stripping machine of the present invention.
servo motors 4a, 4b and digital control circuit 5
The intermittent drive control by the digital control circuit 5
The servo parameter memories 27a and 27b for initial setting built in are preset to an acceleration time of, for example, 40 ms, a deceleration positioning time of, for example, 80 ms, and a high-speed conveyance speed of, for example, 45 m/min.
After that, the loading and unloading conveyors 2a, 2b
The servo motors 4a, 4b are connected to the servo parameter memories 27a, 27b of the digital control circuit 5.
When activated by the servo controllers 28a, 28b and the servo drive units 29a, 29b, the narrow veneer 1 on the carry-in conveyor 2a resumes conveyance, and the veneer detector 10 detects irregularities to be cut and separated. Defective parts such as edges, cracks, knotholes, etc. are detected, and the detection signal is transmitted to the sequencer 11 of the digital control circuit 5, and once transferred to the servo parameter memories 27a, 27 via the speed switch 6.
The servo motors 4a, 4b are controlled intermittently by the servo controllers 28a, 28b, and the servo drive units 29a, 29b.

Next, the collision mitigation device at the end face collision position X of the intermediate product 8 and the side-separated product 3 according to the present invention is configured to switch the conveyance speed of the loading and unloading conveyors 2a, 2b into two high and low speeds. ,4b
A speed switch 6 is provided in the digital control circuit 5,
Furthermore, an appropriate detection distance, e.g., is set so as to be able to detect the leading end of the intermediate product 8 arriving immediately before the end face abutting position A veneer detector 9 consisting of a photoelectric switch or the like is installed at a detection distance of about 20 mm, and an intermediate product 8 is located within the detection distance formed by the edge abutting position X and the veneer detector 9.
When the conveyor arrives, the tip is detected and a tip detection signal is transmitted to the speed switch 6, and the speed switch 6 sets the conveyance speed of the carry-in and carry-out conveyors 2a, 2b, and depending on the case, the carry-out conveyor 2a, 2b is set. conveyor 2b
The setting of the conveying speed is reduced from the normal high speed H, for example, about 45 m/min, to a low speed L, for example, about 30 m/min, so that the tip of the intermediate product 8 during the conveying process is is made to buffer against the end face of the rear end of the side-separated product 3 in the stationary process at a low speed L, and immediately after this matching operation is completed, the speed changer 6 or the digital control circuit 5 is The sequencer 11 etc. returns it to normal high speed H again.
That is, it is automatically controlled to return to the normal conveyance speed of about 45 m/min.

〔Effect of the invention〕

As explained above, the present invention has been developed in response to a strong desire in the industry to improve productivity by increasing the conveyance speed in horizontal stripping operations. A new two-speed switching type veneer cross-splitting method that eliminates the risk of conveyance problems due to buckling of the material, resulting in product defects, and joint failures due to the formation of gaps at the edge abutting areas of intermediate products. This was the biggest drawback of the prior art collision force mitigation means that uses rotating rollers to alleviate the collision force when end faces collide using kinetic friction resistance. Irregular gaps are formed in the end abutting parts due to the inertia of the rear collision, causing joint defects, making it impossible to safely and reliably produce high-quality blind-shaped cross-seam products with tightly joined end abutting parts. The present invention not only eliminates all of the serious difficulties, but also enables the end face abutting mechanism between the intermediate product and the side-separated product to be simple and inexpensive, using the sliding friction resistance of a combination of a carry-out conveyor and a braking rail member, as in the past. It is excellent in maintainability and economy because it can be equipped with the same end face meeting mechanism, and the quality and productivity of side-separated products due to its two-speed switching system are higher than any conventional equipment. The implementation effect is extremely significant.

[Brief explanation of drawings]

FIG. 1 is a side view illustrating the collision mitigation device of the present invention, and FIG. 2 is a diagram illustrating the conveyance characteristics of a conveyor using a two-speed switching system. 1, 1a...Small veneer, 2a...Incoming conveyor, 2b...Outgoing conveyor, 3...Horizontal stripping product,
4a, 4b... Servo motor, 5... Digital control circuit, 6... Speed switch, 7a, 7b... Brake rail member, 8... Intermediate product, 9... Single plate detector, X... Edge impact Matching position, A...Detection distance, H...
...High speed, L...Low speed.

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,
A speed switch 6 provided in the digital control circuit 5 of the servo motors 4a, 4b so as to be able to switch the conveyance speed of the loading and unloading conveyors 2a, 2b into two high and low speeds;
An appropriate detection distance A is provided so that the leading end of the intermediate product 8 arriving immediately before the end abutting position X formed at the connecting portion with the brake rail members 7a and 7b connected to the carry-out conveyor 2b can be detected. The transport speed of the intermediate product 8 that has arrived within the detection distance A is changed from high speed H to low speed L each time.
A collision mitigation device for a veneer horizontal stripping machine, characterized in that the collision force with the horizontal stripping product 3 generated at the end surface collision position X is reduced.