JPH04282201A - Scarf joining device for veneer - Google Patents

Abstract

PURPOSE:To make it possible to safely and surely execute efficient scarf jointing operation by a method wherein the jointing location of product is moved in succession without giving excessive inertia at forward and backward runnings to the product. CONSTITUTION:The scarf jointing device of veneers concerned has a computer 15, which follow-up controllably connects the carrying amount of the following scarf jointing veneer 4 with a third servomotor 13 to the movements of traveling hot presses 8a and 8b with a first and a second servomotors 10a and 10b through the comparison among the detection signals of a first, a second and a third rotary encoders 11a, 11b and 14 and, at the same time, the first and the second servomotors 10a and 10b so as to control the forward and backward freely.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention produces parallel plywood made by laminating and bonding a large number of sheets with the fiber direction facing the length direction of the product, or a long veneer laminated material commonly called LVL or LVB. In order to obtain a long veneer veneer several meters long, which is required for a special occasion, from a regular short veneer veneer of about 1 meter, a large number of short veneer veneers are longitudinally peeled in the fiber direction to make a long veneer veneer. This relates to a vertical stripping device for veneer veneer to form a veneer.

0002

[Prior Art] A conventional veneer veneer vertical stripping device of this type is a single-function device that is installed in the previous step and is capable of forming symmetrical scarf slopes on either the front or the back end of the wood grain. Using a scarf machine, etc., the intermediate product, which has been prepared in advance by cutting to form symmetrical scarf slopes on both edges of the veneer veneer in the previous step, is deposited and placed on a conveyor.
The sheets are taken out one by one, and while being taken out, an adhesive is applied to the upward scarf slope by some method, for example by hand painting, and then fed to a veneer veneer vertical stripping machine equipped with a hot press machine. For example, a feeding belt that is driven intermittently in one direction only, as disclosed in Japanese Patent Publication No. 62-22764, a vertical splicing device for veneers, which joins vertically while conveying the sheets alternately in forward and reverse rotations. A hot press machine consisting of a movable clamping plate and a fixed clamping plate is positioned between the conveyor unit and a delivery belt conveyor unit which is driven in the same direction in synchronization with the conveyor unit and temporarily driven in the opposite direction. A stopper for the rear end of the veneer is provided below the movable clamping plate so as to be movable back and forth, and a stopper for the front end of the veneer and a roller for pushing up the veneer are installed in front of the fixed clamping plate, respectively. A movably mounted veneer longitudinal splicing device is known as a prior art device.

0003

[Problems to be Solved by the Invention] However, in the conventional device as described above, the scarf slopes at the front and rear ends of the conveyor, which are sharply formed, are aligned by colliding with a stopper or the like each time a welding operation is performed, resulting in damage to the material. It is easy to use, and because it is a method in which the vertically spliced veneer is once joined into a long length, it is alternately rotated forward and backward on the conveyor, and then joined to a longer lengthwise spliced veneer. There was a high risk that the components would act on the product and break the fragile joints.

[0004] Therefore, in order to eliminate the drawbacks of the above-mentioned conventional apparatus, the present invention does not require forward/reverse conveyance after being commercialized into long longitudinally spliced veneers; By equipping a series of processes with a multiple-row positioning movement thermopressure mechanism using a servo motor, rotary encoder, and computer that allows the press to repeatedly move in forward and reverse directions, we are able to impart extreme forward and reverse inertia to the product. This makes it possible to carry out efficient vertical stripping work safely and reliably by moving the splicing location alternately without applying any force.
The purpose of this invention is to provide a veneer veneer vertical stripping device that has a new moving heat-pressing function.

[0005]

[Means for Solving the Problems] In order to achieve the above object, the present invention is a veneer veneer vertical stripping device having the following structural requirements.

(a) Transferring the rear end of the preceding vertically spliced veneer that was joined first and the transporting front end of the succeeding vertically spliced veneer that will be joined next, using a plurality of rows of moving thermal pressure that serves as a moving joining location for both. A veneer detector that detects alternately on the loading side of the press.

(b) first and second servo motors that alternately reciprocate the movable thermopress press in accordance with the cutting pitch of the scarf slope;

(c) first and second rotary encoders that separately detect the amount of movement of the moving hot press by the first and second servo motors;

(d) A third rotary encoder for detecting the conveyance amount of a third servo motor that drives a pinch roller for conveying the subsequent vertically-separated veneer, which is installed on the input side of the mobile hot-pressing press.

(e) Comparing the detection signals of the first, second and third rotary encoders to detect the first, second and third rotary encoders.
The first and second servo motors are connected to the third servo motor so that the conveyance amount of the subsequent longitudinally-sewn veneer can be controlled to follow the amount of movement of the moving hot press by the third servo motor. A computer connected to freely control forward and reverse rotation.

[0011]

[Operation] Since the present invention is constructed as described above, the front end of the conveyance is turned into a downward scarf slope by the scarf machine disposed in the previous step, and the rear end of the conveyance is turned into an upward scarf slope. The subsequent longitudinally-separated veneer that has been symmetrically cut is sent to an adhesive applicator such as a spray type installed in the next process, and is formed on the conveyance front end and conveyance rear end of the subsequent longitudinally-separated veneer. An appropriate amount of a thermosetting adhesive such as resorcinol resin is applied to either the downwardly or upwardly facing scarf slopes and then fed to the longitudinal stripping apparatus of the present invention. On the other hand, in the longitudinal stripping apparatus of the present invention, the rear end portion of the transported longitudinally-splitting veneer is integrally joined with the succeeding longitudinally-splitting veneer at a moving joining place and transported to the next process. Then, the front end of the subsequent longitudinally-splitting veneer is transported to the mobile joining site and is joined by a photoelectric sensor installed on the inlet side of the multiple rows of mobile thermopress presses that serve as the mobile joining site. The veneer detectors such as switches detect the veneer alternately, and when the veneer detector first detects the conveying rear end of the preceding longitudinally spun veneer, the veneer is stopped by a plurality of rows of moving hot presses. Immediately stop the movement of the preceding vertical stripping veneer in the unloading direction by the moving chain of any row, and move the unloading side moving joint separated by a predetermined cutting pitch symmetrically cut by the scarf machine in the previous step. Temporarily stop the moving hot-pressing presses in the relevant row at a location to complete the predetermined hot-pressing operation, and then wait for the completion of the hot-pressing action to release the compressing action of the moving hot-pressing presses in the relevant row, When the moving chains of other rows start moving the subsequent longitudinally spliced veneers in the unloading direction, the reversing movement toward the loading side is started again, and the moving thermopress press of the row is returned to the first moving joint location. , 1st
and a second servo motor, first and second rotary encoders that detect the amount of movement of the first and second moving chains, and a computer that drive the first and second moving chains in forward and reverse directions that drive the moving thermopress press. The control is carried out in stages, and the upward scarf slope formed at the rear end of the conveyance of the preceding longitudinally spun veneer is brought to a standstill approximately at the center of the moving thermopress press of the row that has returned to the initial movement location. Also, when the veneer detector detects the conveyance front end of the following longitudinally spun veneer, the following longitudinally spliced veneer installed on the input side of the mobile heat-pressing press is automatically controlled. A pinch roller for conveying the veneer, a third servo motor for driving the veneer, a third rotary encoder for detecting the amount of conveyance, and the computer automatically control the follow-up of the subsequent longitudinally spun veneer. The downward scarf slope formed at the front end of the conveyance of the succeeding longitudinally spun veneer is replaced by the upward scarf at the rear end of the conveyor of the preceding longitudinally spun veneer, which is stationary at approximately the center of the plurality of rows of moving heat-pressing presses. It is automatically controlled to accurately overlap the slope. Therefore, the upward scarf slope of the leading longitudinally veneer and the downwardly facing scarf slope of the succeeding longitudinally veneer, on either side of which is coated with adhesive, are moved by a plurality of rows of moving heat-pressing presses, which serve as the movable joining site for both. The pressure cylinder attached to the moving heat-pressing press is activated to stack the preceding longitudinally-splitting veneer and the following longitudinally-splitting veneer from above and below. If the vicinity of the scarf overlapping part is pressed with a desired pressure, for example, about 10 kg/cm2, the thermal energy is rapidly applied to the scarf, since the moving thermopress press is heated by electric heat, heating fluid, etc. Since the adhesive is applied to the vicinity of the overlapping part and starts to heat and harden, the joining location is moved in the unloading direction while the hot pressing operation by the moving hot pressing press of this row is being applied, and the required hot pressing time is maintained.
For example, while reliably maintaining heat pressure time of several seconds or more,
The moving chains of the multiple rows of moving hot presses are driven so that the conveyance and stacking operations of the subsequent longitudinally spliced veneer for the next joining operation are transferred to any of the other rows of moving hot presses. The first and second servo motors and the third servo motor that drives the pinch roller for conveying the subsequent longitudinal stripping veneer are activated to match the cutting pitch symmetrically cut by the scarf machine in the previous step. The joint is moved to the discharge side by a distance of , and the continuous vertical strip joining operation is repeated. In addition, after repeating the above-mentioned vertical splicing operation several times, the entire product is made into a long pre-splitting veneer, which is then conveyed by a conveyor etc. to a length cutting machine installed in the next process and cut into a predetermined shape. In order to cut the length of the product, a detection signal from a first or second rotary encoder that detects the amount of movement of the moving chain that is locked to the moving hot pressure press and a computer connected thereto are used to determine the length of the product. A length cutting machine is automatically controlled to automatically cut products into predetermined lengths, for example, products of about 4 m in length, and the products are stacked one after another in a product storage area.

0012

[Embodiment] An embodiment of the present invention formed into a series of processes including a scarf machine and an adhesive applicator disposed in the front stage process is shown in FIG. On top, a suitable thickness and size, for example 3 mm.
A veneer veneer 1 with a thickness of about 1 m square is mounted and fed to a composite scarf machine 3 from the fiber direction. As illustrated in FIG. 2, the scarf machine 3 has a predetermined cutting pitch (P) that can be changed back and forth, for example, a cutting pitch of about 900 mm (
A pair of cutter blocks 3 vertically symmetrically facing each other at P)
a and 3b in the transport direction at a desired inclination angle, for example, at an inclination angle of about 7 to 14 degrees that can form a scarf slope (S) about 4 to 8 times the thickness (t) of the veneer veneer 1. It is constructed so that it can move back and forth. The cutter blocks 3a, 3
The reciprocating motion of b may be either a linear sliding mechanism using a crank or an arcuate swinging mechanism using an arm, and the cutter blocks 3a and 3b are installed on both sides of the veneer veneer 1 that is conveyed in a direction perpendicular to the fiber direction. In short, each of the conveyance front end and the conveyance rear end of the veneer veneer 1 simultaneously cuts the downward scarf slope 2a and the upward scarf slope 2b symmetrically at a predetermined cutting pitch (P), and both Any scarf machine 3 that can form the scarf in parallel may be used. Further, the subsequent vertically-stripped veneer 4, which is carried out from the scarf machine 3 and whose front end is cut into a downward scarf slope 2a and whose rear end is cut into an upward scarf slope 2b, is transferred to the conveyor for the next process. The front end of the conveyance or the rear end of the conveyance is detected by the veneer detector 5 such as a photoelectric switch installed between the rows of 17, and the arrival of the downward or upward scarf slopes 2a, 2b to which adhesive should be applied. is detected. The detection signal transmitted by the veneer detector 5 is sent to a spray-type adhesive applicator 6 connected to an airless pump unit or the like via a timer or other time-limiting circuit 18, or an extrusion type or rotating device having the same function. A resorcinol resin or the like is applied to only the downward scarf slope 2a at the conveying tip of the succeeding vertically-separated veneer 4, which is conveyed to an adhesive applicator such as a mold and conveyed by a conveyor 17 as shown in the figure. Appropriate amounts of thermosetting adhesive are applied in a timed manner. On the other hand, the whole is joined to the preceding longitudinally-splitting veneer 7, which has been integrally joined with the succeeding longitudinally-splitting veneer 4 in the multiple rows of moving heat-pressing presses 8a and 8b, which serve as moving joining locations, and then transported to the next process. The rear end of the conveyed material and the front end of the conveyance of the subsequent longitudinally-splitting veneer 4 to be carried into one of the rows of the moving hot-pressing presses 8a, 8b and joined are the moving joining place of both. Naru moving hot press 8
Conveyor 17 and pinch roller 12 on the carry-in side of a and 8b
The veneer detector 9 such as a photoelectric switch installed between the rows a and 12b alternately detects the veneer, and first the veneer detector 9 detects the conveyance rear end of the preceding longitudinally spun veneer 7. At this time, the first and second servo motors 10, such as AC type, drive the first and second moving chains 19a, 19b, which are respectively locked to the moving hot presses 8a, 8b.
a, 10b, and the first and second moving chains 19a.
, 19b, first and second rotary encoders 11a, such as absolute type rotary encoders 11a,
11b, and the first and second servo motors 10a.
, 10b and the first and second rotary encoders 11a, 11b, respectively, by forward/reverse control of the moving chains 19a, 19b which alternately drive the moving hot presses 8a, 8b. The upward scarf slope 2b of the conveyed rear end of the stripped veneer 7 is held stationary at approximately the center of the moving hot presses 8a, 8b in either row, and the joining operation is performed with the subsequent longitudinally stripped veneer 4 that arrives next. Then, when the veneer detector 9 detects the conveyance front end of the succeeding longitudinally spun veneer 4, the veneer detector 9 is placed on the carry-in side of the moving hot press 8a, 8b in either row. Pinch roller 12a for conveying the subsequent longitudinally spliced veneer,
12b, a third servo motor 13 such as an AC type that drives the pinch rollers 12a and 12b, a third rotary encoder 14 such as an absolute type that detects the conveyance amount of the pinch rollers 12a and 12b, and 3 servo motor 13 and the pinch rollers 12a, 1 for conveying the subsequent vertical strip veneer by the computer 15 connected to the second rotary encoder 14;
2b, the downward scarf slope 2a of the conveyance front end of the succeeding longitudinal stripping veneer 4 is moved to the preceding longitudinal stripping veneer stationary at approximately the center of the moving hot presses 8a, 8b in any of the rows. Upward scarf slope 2 at the rear end of the veneer 7
It is accurately placed on top of b and starts moving to the next stage. Therefore, as described above, the subsequent longitudinally spliced veneer 4 is coated with adhesive.
The downward scarf slope 2a and the upward scarf slope 2b of the preceding longitudinally spun veneer 7 to which no adhesive has been applied are defined by the moving hot pressure presses 8a, 8 as illustrated in FIGS.
Because it is accurately superimposed on the fixed plate 80 constituting b.
The movable platen 81 facing the fixed platen 80 is connected to the pressurizing cylinder 8
2, scarf slopes 2a, 2 are activated from above and below.
The vicinity of the overlapping portion of the scarves b is pressed with a desired pressure force, for example, about 10 kg/cm2, and the fixed platen 80 and the movable platen 81 are heated to about 150 to 200° C. by electric heating or heating. Thermal energy such as fluid is applied to the vicinity of the scarf overlapping part and transferred to the subsequent stage to ensure that the required heat pressure time, for example, several seconds or more, is maintained, and the heat energy for the next joining operation is maintained. A plurality of movable heat presses 8a and 8b respectively engaged with the moving heat presses 8a and 8b in the other rows are configured to transfer the conveying operation and stacking operation of the succeeding longitudinally spliced veneer 4 to either of the movable heat presses 8a and 8b in the other rows. 1st and 2nd
The first and second servo motors 10a, 10b that drive the moving chains 19a, 19b, and the third servo motor 13 that drives the pinch rollers 12a, 12b for conveying the subsequent longitudinally-sewn veneer are connected to a rotary encoder. 11a, 11b, 14 and the computer 15, the scarf machine 3 in the previous step moves to a predetermined cutting pitch (P) of approximately 900 mm, for example, to a moving joining location on the delivery side. The moving hot presses 8a and 8b in that row are moved and once stopped to complete the predetermined heat pressing operation, and then, just before the moving hot pressing presses 8a and 8b in the other row start moving, the pressure is started. At the same time as releasing the tightening operation, the moving hot presses 8a and 8b of the other rows
In response to the movement, the moving thermopress presses 8a, 8 of the corresponding row are started to move in reverse to the carry-in side again and moved to the first moving joining place.
b is returned to standby for the next vertical strip joining operation. The product 20, which has been made into a long pre-splitting veneer by repeating the above-mentioned longitudinal splicing operation several times, is then conveyed on a conveyor 23 to a length cutting machine 22 disposed in the next process. A first press that can be freely installed and conveys the preceding longitudinally spliced veneer 7 by a plurality of rows of moving hot presses 8a and 8b.
and the first or second rotary encoder 11 that detects the amount of movement of the second moving chains 19a, 19b.
Using the detection signals of a and 11b and the computer 15 connected thereto, the products are automatically cut into a predetermined length, for example, about 4 m, and are sequentially deposited in the product storage area.

[0013]

Effects of the Invention As explained above, since the present invention has been commercialized into long longitudinally spliced veneers, there is no need for forward/reverse conveyance, and instead a hot pressure press is used as the joining location. A veneer veneer with a new moving heat-pressing function is equipped with a multiple-row positioning moving heat-pressing mechanism using a servo motor, rotary encoder, and computer that can repeat forward and reverse movements in a series of processes. Since it is a vertical stripping device, there are problems such as damage to the material when the scarf slopes at the front and rear ends of the scarf, which are sharply formed, collide with stoppers etc. each time in conventional devices to align them. Fracture of the joint due to excessive forward and reverse inertia being applied to the product, such as when vertically spliced veneers are joined together on a conveyor to become longer lengths by repeating forward and reverse rotations. All of these difficulties have been overcome, and since the apparatus of the present invention is equipped with multiple rows of moving hot presses that operate alternately, the return of the moving hot presses required for forward and reverse rotation is eliminated. This is an extremely effective invention that can achieve high productivity by virtually eliminating time.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the arrangement of a series of steps.

FIG. 2 is an explanatory diagram showing the operation mode of the composite scarf machine.

FIG. 3 is a plan view showing the arrangement of multiple rows of moving hot presses.

[Explanation of symbols]

1 Veneer veneer 2a, 2b Scarf slope 3 Combined scarf machine 3a, 3b Cutter block 4 Following vertical stripping veneer 5, 9 Veneer detector 6 Glue applicator 7 Leading vertical stripping veneer 8a, 8b Moving thermopress 10a First servo motor 10b Second servo motor 11a First rotary encoder 11b Second rotary encoder 12a, 12b Pinch roller 13 Third servo motor 14 Third rotary encoder 15 Computer

Claims (1)

[Claims] Claim 1: A plurality of rows of moving thermopressing presses that serve as moving joining locations for the rear end of the conveyance of the preceding longitudinally spliced veneer that has been joined first and the conveyance front end of the subsequent longitudinally spliced veneer that will be joined next. a veneer detector that alternately detects on the carry-in side; first and second servo motors that alternately reciprocate the movable thermopress press in accordance with the cutting pitch of the scarf slope;
Drives first and second rotary encoders that separately detect the amount of movement of the mobile heat-pressing press by a servo motor, and a pinch roller for conveying the subsequent longitudinally-splitting veneer installed on the loading side of the mobile heat-pressing press. A third rotary encoder detects the conveyance amount of the third servo motor, and the detection signals of the first, second, and third rotary encoders are compared to determine the movement by the first and second servo motors. The third servo motor is connected to control the amount of conveyance of the subsequent longitudinally spun veneer by the third servo motor in accordance with the amount of movement of the hot press, and the first and second servo motors are connected to control the forward and reverse directions. A vertical stripping device for plywood veneer, characterized in that it consists of a computer and a computer.