JPH04278301A - End jointing device of veneer - Google Patents

Abstract

PURPOSE:To make it possible to safely and surely execute efficient end jointing operation by a method wherein the joining location of product is moved in succession without giving excessive inertia at forward and backward runnings to the product. CONSTITUTION:The end jointing device of veneers concerned has a computer 15, which follow-up controllably connects the carrying amount of the following end jointing veneer 4 with a third servo motor 13 to the movements of travelling hot presses 8a and 8b with a first and a second servo motors 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 connects the first and the second servo motors 10a and 10b so as to control them forward and backward runnably.

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, both edges of the veneer veneer are formed into symmetrical downward scarf slopes and upward scarf slopes to form a series of processes from cutting to joining. Since we are not equipped with a multi-functional scarf machine for simultaneous cutting or an automatic applicator for selectively applying adhesive to one side of the scarf slope during the series of processes, there is no need for the scarf cutting process or adhesive application. Each process is separated and requires a large number of workers.
Not only was this inefficient, but the scarf slopes at the front and rear ends of the conveyor, which are sharply formed, collide with stoppers etc. each time the welding operation is performed, which tends to cause damage to the material. This method involves rotating the veneer alternately in forward and reverse directions on a conveyor and then joining it to a longer lengthwise spliced veneer, so the inertia of the extreme forward and reverse rotation acts on the product and weakens the fragile joints. There was a high risk of it breaking.

[0004] Therefore, in order to eliminate the drawbacks of the conventional device, the present invention provides a multifunctional scarf machine that can simultaneously cut a downward scarf slope and an upward scarf slope.
Since it was commercialized with a spray-type applicator that can selectively apply adhesive to the scarf slope on one side, and a long vertically-stripped veneer, it does not require forward and reverse conveyance. Instead, the hot press that serves as the welding location is equipped with a servo motor, rotary encoder, and computer-based multi-row positioning movement heat press mechanism that can repeatedly move forward and backward during the series of processes. , a veneer veneer with a new function that allows efficient vertical stripping work to be carried out safely and reliably by moving the joint location alternately without giving the product extreme forward and reverse inertia. The purpose is to provide a vertical stripping device.

[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) A composite scarf machine that simultaneously cuts the front end of a veneer veneer transported in the fiber direction into a downward scarf slope, and the rear end of the transport into an upward scarf slope.

(b) The first veneer detector detects the conveyance front end or the conveyance rear end of the succeeding longitudinally spliced veneer carried out from the scarf machine, and the veneer is formed at the conveyance front end or the conveyance rear end. An applicator, such as a spray type, that temporarily applies adhesive to the downward or upward scarf slope.

(c) The transport rear end of the preceding longitudinally spliced veneer that has been joined earlier and the transporting front end of the subsequent longitudinally spliced veneer are moved to the input side of the multiple rows of moving thermopressing presses that serve as the jointing site for both. The second single plate detector detects alternately.

(d) A first step in which the movable thermopressing press is moved back and forth alternately in accordance with the cutting pitch of the scarf machine.
and a second servo motor.

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

(f) A third rotary encoder that detects the conveyance amount of a third servo motor that drives a pinch roller installed on the input side of the moving hot-pressing press.

(g) Comparing the detection signals of the first, second and third rotary encoders,
The amount of conveyance of the succeeding longitudinally spun veneer by the third servo motor is connected to the amount of movement of the moving hot press by the servo motor of
, a computer connected to a second servo motor for free forward and reverse control.

[0013]

[Operation] Since the present invention is constructed as described above, a conveyor of an appropriate thickness and size, for example, 3 mm thick or 1 m thick, is placed on a conveyor consisting of rollers forming a series of conveyor lines.
If a square veneer veneer is fed automatically or manually from the fiber direction using a known means such as a veneer feeder, the veneer veneer can be cut at a predetermined cutting pitch that can be changed back and forth, and vertically symmetrically. A pair of cutter blocks facing each other are cut at a desired angle of inclination, for example, from 4 to 8 mm thick
A composite scarf machine is constructed by constructing each scarf machine at an inclination angle of about 7 to 14 degrees, capable of forming a scarf slope twice the size of the scarf, and is reciprocally movable in the conveying direction. The rear end of the conveyance is simultaneously cut symmetrically on the upward scarf slope, and the intermediate product with a predetermined cutting pitch, for example, about 900 mm, is carried out as a subsequent longitudinally-separated veneer onto a conveyor consisting of rollers, etc. for the next process. In addition, on the conveyor consisting of rollers, etc. for the next process, there is a first veneer detector consisting of a photoelectric switch, etc., which detects the conveyance front end or conveyance rear end of the subsequent longitudinally spliced veneer carried out from the previous stage scarf machine. It has been constructed and the first
An airless pump that directly sprays a bonding adhesive, such as a thermosetting adhesive such as resorcinol resin, at a pressure of about 100 to 200 kg/cm2 using a detection signal detected by a single-plate detector through a timer or other time-limited circuit. The information is transmitted to an applicator such as a spray type connected to a unit, etc., to apply the information to either the downward or upward scarf slope formed at the front end of the conveyance and the rear end of the conveyance of the subsequent longitudinally spliced veneer during the conveyance process. Appropriate amounts of the adhesive are applied in a timed manner. On the other hand, the rear end of the transported longitudinally-splitting veneer, which is first joined together with the succeeding vertically spliced veneer at the moving joint site and transported to the subsequent stage, is then transported to the mobile jointing site. A second veneer detector consisting of a photoelectric switch, etc. is installed at the front end of the conveyance of the subsequent longitudinally spliced veneer to be joined, which is installed on the inlet side of the multiple rows of moving heat-pressing presses that serve as the place for moving and joining the two veneers. When the second veneer detector first detects the conveyance rear end of the preceding longitudinally spun veneer, it is detected by the second veneer detector which is connected to one of the plural rows of moving heat-pressing presses. Immediately stop moving the preceding longitudinally spliced veneer in the unloading direction by the moving chain of the row, and once move the corresponding row to the moving joint location on the unloading side separated by a predetermined cutting pitch that has been symmetrically cut by the scarf machine in the previous stage. The moving hot press of the row is stopped to complete a predetermined heat pressing operation, and then, after the hot pressing operation is completed, the pressing operation of the moving hot press of the relevant row is released, and the other rows are moved. When the chain starts to move the subsequent longitudinally spliced veneer in the unloading direction, the first and second moving thermopress presses in the row start to move in the opposite direction again to the carry-in side and return the moving thermopress presses of the row to the first moved joining place. 2 servo motors and the first and second
The forward/reverse control of the first and second moving chains that drive the moving hot press is performed stepwise by first and second rotary encoders that detect the amount of movement of the moving chain, and a computer. It is automatically controlled so that the upward scarf slope formed at the rear end of the conveyance of the peeled veneer is brought to rest at approximately the center of the moving hot press of the row that has returned to the initial moving place, and When the second veneer detector detects the conveyance front end of the succeeding longitudinally spun veneer, the pinch roller, the third servo motor, and the third The rotary encoder and the computer automatically control the tracking of the subsequent vertically-stripped veneer, and the downward scarf slope formed at the front end of the conveyance of the subsequent vertically-stripped veneer is controlled by the plurality of rows of moving hot-pressing presses. The veneer is automatically controlled so that it is accurately superimposed on the upward scarf slope of the conveyed trailing end of the leading longitudinally spliced veneer, which is stationary at approximately the center of the veneer. 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-cure, the bonding location is moved in the unloading direction while the hot-pressing operation by the moving hot-pressing press in this row is continued, and the required hot-pressing time is maintained, for example. In addition to ensuring that the hot pressing time is maintained for several seconds or more, the conveying and stacking operations of the subsequent longitudinally spliced veneer for the next joining operation are transferred to one of the moving hot pressing presses in the other rows. , activating first and second servo motors that drive moving chains of a plurality of rows of moving hot presses and a third servo motor that drives pinch rollers;
This is to move the material to the delivery side by a distance equivalent to the cutting pitch symmetrically cut by the scarf machine in the previous stage, and repeat the continuous vertical strip joining operation. In addition, after repeating the above-mentioned vertical splicing operation several times to create a long vertically spliced veneer, the product is then cut using rollers, etc., on a fixed-length cutting machine consisting of a veneer clipper, etc. installed in the next stage. A detection signal from a first or second rotary encoder that detects the amount of movement of a moving chain that is locked to the moving heat-pressing press in order to cut the product into a predetermined length by conveying it on a conveyor. A computer connected to the machine automatically controls the length cutting machine to automatically cut products of a predetermined length, for example, about 4 m, and sequentially stack the products in a product storage area.

[0014]

[Embodiment] An embodiment forming a series of steps of the present invention is as shown in FIG.
A veneer veneer 1 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 (P) of about 900 mm.
A pair of cutter blocks 3a facing each other vertically symmetrically,
3b at a desired inclination angle, for example, the thickness of the veneer veneer 1 (t
) 7 that can form a scarf slope (S) about 4 to 8 times as large as that of
They are each installed at an inclination angle of about 14 degrees so as to be able to reciprocate in the transport direction. The reciprocating motion of the cutter blocks 3a, 3b may be either a linear sliding mechanism using a crank or an arc swinging mechanism using an arm. The key point is that each of the conveyance front end and 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). Any scarf machine 3 can be used as long as it can form the scarf in parallel with each other. Further, the subsequent longitudinally-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 rollers of the next process. A first veneer detector 5 consisting of a photoelectric switch etc. installed between the rows of the conveyor 17 consisting of a conveyor 17 detects the front end of the veneer or the rear end of the veneer and determines whether the adhesive is facing downward or upward where adhesive should be applied. scarf slope 2a,
The arrival of 2b is detected. The detection signal transmitted by the first veneer detector 5 is sent to a spray-type applicator 6 connected to an airless pump unit or the like through a timer or other time-limiting circuit 18, or an extrusion-type applicator with the same function as the applicator 6. For example, as shown in the figure, the conveyor 17
An appropriate amount of the adhesive is applied in a timed manner only to the downward scarf slope 2a at the leading end of the subsequent longitudinally spliced veneer 4 being conveyed. On the other hand, in the multiple rows of moving heat-pressing presses 8a and 8b, which serve as moving joining locations, the entire piece is joined together with the succeeding vertically spun veneer 4 and transported to the next stage, becoming the preceding vertically spliced veneer 7. The rear end of the conveyance of the material and the conveyance front end of the subsequent longitudinally-splitting veneer 4 to be transported and joined into either of the moving hot pressure presses 8a, 8b are heated by moving heat, which serves as the moving joining location of both. A second veneer detector 9 consisting of a photoelectric switch or the like installed between the conveyor 17 on the inlet side of the pressing presses 8a, 8b and the rows of the pinch rollers 12a, 12b alternately detects the preceding longitudinal strip. Veneer 7
When the second veneer detector 9 detects the rear end of conveyance of first and second servo motors 10a, such as AC type;
10b, and the first and second moving chains 19a, 1
First and second rotary encoders 11a, 11, such as absolute types, each detecting the amount of movement of the rotary encoder 9b.
b, and the first and second servo motors 10a, 1
0b and the first and second rotary encoders 1
Computers 15 connected to 1a and 11b, respectively
By forward and reverse control of the moving chains 19a and 19b which alternately drive the moving hot pressure presses 8a and 8b, the upward scarf slope 2 at the conveying rear end of the preceding vertically spun veneer 7 is
b is stationary at approximately the center of the moving hot presses 8a, 8b in either row to wait for the joining operation with the succeeding vertically spun veneer 4 that arrives next, and also to transport the subsequent vertically spliced veneer 4. When the second veneer detector 9 detects the front end, the pinch rollers 12a and 12b disposed on the loading side of the moving hot presses 8a and 8b in either row and the pinch rollers are detected. 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 the third servo motor 13. pinch rollers 12a, 1 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 vertically-separated 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.
A movable platen 81 facing the fixed platen 80 is connected to a 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 drive the moving chains 19a, 19b, and the third servo motor 13 drives the pinch rollers 12a, 12b.
is activated by the rotary encoders 11a, 11b, 14 and the computer 15, and the predetermined scarf machine 3 cuts symmetrically, for example, 90.
Move the mobile thermopressing presses 8a and 8b in either row to the moving joining location on the delivery side separated by a cutting pitch (P) of about 0 mm, and complete the predetermined thermopressing operation while keeping them stationary. Thereafter, the clamping operation is canceled immediately before the moving hot presses 8a, 8b in the other rows start moving, and the moving hot presses 8a, 8b in the other rows are moved in the reverse direction again to the loading side in response to the movement. Then, the moving hot presses 8a and 8b of the row are returned to the first moving joining location and are placed on standby for the next vertical strip joining operation. The product 20, which has been made into a long pre-split veneer by repeating the above-mentioned vertical splicing operation several times, is then processed by the veneer clipper 2 installed at the next stage.
A first cutter 22 is equipped with a fixed-length cutting machine 22 such as a roller, etc. so that it can be conveyed freely on a conveyor 23 made of rollers, etc., and the preceding vertically-separated veneer 7 in the previous stage is sandwiched and conveyed by a plurality of rows of moving hot pressure presses 8a and 8b. And a product length of a predetermined length, for example, about 4 m, is determined by the detection signal of the first or second rotary encoder 11a, 11b that detects the amount of movement of the second moving chain 19a, 19b, and the computer 15 connected thereto. The products are automatically cut and stacked in the product storage area one after another.

[0015]

[Effects of the Invention] As explained above, the present invention provides a multifunctional scarf machine that can simultaneously cut a downward scarf slope and an upward scarf slope, and selectively applies adhesive to one scarf slope. Since the product was commercialized into long vertically-stripped veneers, there is no need for forward/reverse conveyance, and instead a hot pressure press is used as the joining location. This veneer veneer vertical stripping machine has a new function and is equipped with a multi-row positioning movement thermopressure mechanism using a servo motor, rotary encoder, and computer that can repeat forward and reverse movements during a series of processes. Because of this, the scarf cutting process, adhesive application process, etc. in conventional equipment are separated and require a large number of workers, which not only causes inefficiency, but also
There are difficulties such as damage to the material due to the sharply formed scarf slopes at the front and rear ends of the conveyor colliding with stoppers each time to align them, and the problem of forward and reverse rotation of vertically spliced veneers once joined in a long length on the conveyor. This method eliminates all problems such as breakage of joints due to the inertia of extreme forward and reverse rotations that are applied to the product when repeatedly joining longer lengths. Since the apparatus of the invention is equipped with a plurality of rows of moving hot pressure presses, the return time required for forward and reverse rotations can be virtually eliminated and high productivity can be achieved, making it an extremely effective invention.

[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 Composite scarf machine 3a, 3b Cutter block 4 Following vertical stripping veneer 5 First veneer detector 6 Applicator 7 Leading vertical stripping veneer 8a, 8b Moving thermopress press 9 Second single plate detector 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] 1. A composite scarf machine that simultaneously cuts the front end of a veneer veneer transported in the fiber direction into a downward scarf slope and the rear end of the transport into an upward scarf slope, and the scarf machine The downward or upward scarf slope formed at the front or rear end of the conveyance by detecting the conveyance front end or the conveyance rear end of the succeeding longitudinally spliced veneer carried out by the first veneer detector. An applicator, such as a spray type, which applies adhesive in a timed manner to a second veneer detector that alternately detects on the input side of a plurality of rows of moving hot pressure presses, and first and second veneer detectors that alternately move the moving hot presses back and forth in accordance with the cutting pitch of the scarf machine 2 servo motors, first and second rotary encoders that separately detect the amount of movement of the moving hot press by the first and second servo motors, and installed on the loading side of the moving hot press. A third rotary encoder detects the conveyance amount of a third servo motor that drives the pinch roller, and the detection signals of the first, second, and third rotary encoders are compared to detect the conveyance amount of the third servo motor that drives the pinch roller. The third servo motor is connected to control the conveyance amount of the subsequent longitudinally-sewn veneer to follow the amount of movement of the moving hot press by the motor, and the first and second servo motors are controlled in forward and reverse directions. A vertical stripping device for veneer veneer, characterized by consisting of a freely connected computer.