JPH03147802A - Device for longitudinally jointing veneer - Google Patents

Abstract

PURPOSE:To perform a longitudinal joining operation in an efficient and safe manner by providing in series a scarf machine to form alternately a downwardly inclined surface and an upwardly inclined surface by cutting, a spray coater to selectively coat adhesives and a positioning mechanism to effect variable speed transfer. CONSTITUTION:A scarf machine 3 has a pair of cutter blocks 3a, 3b located respectively in front and in the rear, and on the upper and lower sides to form a desired angle of inclination, e.g. an inclined scarf surfaces (S) having a length 4-8 times the thickness (t) of a veneer 1. A proper quantity of adhesives is sprayed and applied only over an upwardly inclined scarf surface 2b, for a limited time, at the rear end of a veneer 4 to be longitudinally joined, which has been transferred just under a spray coater 6 of two component type. A computer 16 performs follow-up and variable speed controls in such a manner that a downwardly incline scarf surface 2a at the forward end of the succeeding veneer 4 is precisely superposed on an upwardly inclined surface 2b at the rear end of a preceding veneer 7 staying approximately in the middle of a press stationary platen 8.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to parallel plywood, commonly known as LVL, which is produced by laminating and bonding a large number of sheets with the fiber direction facing the length direction of the product. In order to obtain the long veneer veneers needed to produce board laminates from regular short veneer veneers, a large number of short veneer veneers are longitudinally peeled in the fiber direction to form long veneer veneers. This is related to a vertical stripping device for plywood veneers.

(Prior art) This type of conventional veneer veneer longitudinal stripping device previously forms symmetrical scarf slopes on both ends of the veneer veneer using a single-function scarf machine installed in the previous step. The intermediate products prepared by cutting are taken out one by one from the stack onto a conveyor, and when they are taken out, hot adhesive is applied to the upward scarf slope by some method, for example, by hand painting. The veneer veneer is supplied to a vertical stripping machine equipped with a press machine and joined in the vertical direction while being alternately conveyed in forward and reverse rotations.
A feeding belt conveyor device that is driven intermittently in one direction only, as disclosed in the No. 4 veneer longitudinal splicing device, and a belt conveyor device that drives in the same direction in synchronization with the device and temporarily drives in the opposite direction. A hot press machine consisting of a movable clamping plate and a fixed clamping plate is positioned between the delivery belt conveyor device, and a stopper for the rear end of the veneer is provided below the movable clamping plate so as to be movable back and forth. A veneer longitudinal splicing device is known in which a stopper for the front end of a veneer and a roller for pushing up a veneer are provided in front of a fixed clamping plate so as to be movable up and down.

(Problem to be Solved by the Invention) However, the above-mentioned conventional device has two edges of a veneer veneer formed into a symmetrical downward scarf slope and an upward scarf slope to form a series of processes from cutting to joining. Since it is not equipped with a multi-functional scarf machine for alternating cutting and coating, and an automatic applicator for selectively applying adhesive to the slope of the scarf, the scarf cutting process and adhesive application process are separated into multiple processes. Not only is it inefficient and requires several workers, but the scarf slopes at the front and rear ends of the conveyor, which are sharply formed, collide with the stopper each time the welding operation is performed, making it easy to damage the material. This is a method in which a long length of vertically spliced veneer is rotated forward and backward on a conveyor, and then joined to a longer lengthwise spliced veneer, so it is vulnerable due to the problem of extreme forward and reverse rotation. In order to eliminate these difficulties, the present invention provides a scarf machine with multiple functions that can alternately cut the downward scarf slope and the upward scarf slope. , a spray applicator that can selectively apply adhesive to the scarf slope on one side, and a servo motor, rotary encoder, and computer-based positioning that allows cushioning acceleration/deceleration transport without forward/reverse rotation. To provide a vertical stripping device for veneer veneer, which is equipped with a mechanism in a series of processes to safely carry out efficient vertical stripping work by buffering acceleration/deceleration conveyance without extreme forward and reverse conveyance. This is the purpose.

[Means for Solving the Problems] In order to achieve the above object, the present invention has the following specific explanations: a) Before conveying the plywood veneer being conveyed in the m-phase direction b) C) d) e) With the end facing downward A composite scarf machine that cuts the scarf slope of the veneer, and then also cuts the conveyed rear end thereof into an upward scarf slope; a spray applicator that detects the end portion with a first veneer detector and time-limitedly applies adhesive to the upward scarf slope formed at the rear end portion of the conveyance; and the preceding longitudinal strip that was joined earlier. a second veneer detector that alternately detects the conveyance rear end of the veneer and the conveyance front end of the subsequent assembled veneer on the carry-in side of the press fixing plate where the two are joined; a first rotary encoder that detects the amount of conveyance of the preceding longitudinally spun veneer by a first pinch roller and a first servo motor installed on the unloading side;
a second pinch roller installed on the loading side of the press fixed platen and a second rotary encoder that detects the conveyance amount of the second servo motor; and detection signals of the first and second rotary encoders. By comparing the following, the amount of conveyance of the following spliced veneer by the second servo motor is determined by the amount of conveyance of the preceding vertically spun veneer by the first servo motor, and the controller is connected to control the speed and deceleration of the following. , a computer, and a veneer veneer vertical stripping device, and a dependent invention of the present invention is 9) a pair of cutter blocks facing each other in the front and back and up and down directions, which can be freely reciprocated in the conveying direction at a desired inclination angle. That's what I did.

h) Grid electrodes are arranged in a staggered manner on the press fixed plate and the pressable vJ plate.

) The grid electrodes on the press fixed platen side were individually connected to the divided voltage feeding coil of the high frequency power supply.

j) A fixed-length cutting line is provided on the unloading side of the preceding longitudinally spun veneer to control it in proportion to the conveyance amount.

This is a device for vertically stripping veneer veneer.

[For production]

Since the present invention is constructed as described above, a veneer veneer of an appropriate thickness and size, for example, 3# thick and approximately 1771 square, is placed on a conveyor consisting of rollers forming a series of conveyance lines. automatically from the direction by known means,
Alternatively, by manually feeding the veneer veneer, it is possible to form a scarf slope with a desired inclination angle by using a pair of cutter blocks facing each other front and back and up and down, for example, about 4 to 8 times the thickness of the veneer veneer. A composite scarf machine installed at an angle of inclination of about 7 to 14 degrees so as to be able to reciprocate in the conveying direction first places the front end of the scarf on the slope facing downward, and then the second end of the scarf conveys the scarf facing upward. The sloping surface is cut symmetrically and alternately, and then the veneer is carried out as a subsequent piece of veneer onto a conveyor consisting of rollers, etc. for the next process. Furthermore, on the conveyor consisting of rollers, etc. for the next process, there is a first veneer detection device consisting of a photoelectric switch, etc., which detects the conveyance front end or conveyance rear end of the subsequent laminated veneer carried out from the composite scarf machine. A container is installed, and the detection signal detected by the first veneer detector is passed through a timed circuit such as a timer and a bonding adhesive, for example a thermosetting adhesive such as resorcinol resin, is applied at 100 to 200 KFI/ctd. The applied pressure is transmitted to a two-component mixing type spray applicator connected to an airless pump unit, etc., which directly sprays the base agent and hardening agent, and the spray is applied to the rear end of the subsequent laminated veneer during the conveyance process. A suitable amount of the adhesive is timed and sprayed 6 only on the upwardly facing scarf slope. On the other hand, the rear end of the transported vertically spliced veneer, which is first joined together with the subsequent spliced veneer at the joint site and transported to the next process, is then transported to the joint site and joined. The conveyance front end of the subsequent spliced veneer is alternately detected by a second veneer detector consisting of a photoelectric switch, etc. installed on the input side of the press fixed platen where the two are joined, When the conveyance rear end of the preceding longitudinally spun veneer is detected, a first pinch roller disposed on the unloading side of the welding place and a first servo that drives the first pinch roller are activated. A motor and a first rotary encoder that detects the amount of conveyance of the first pinch roller accelerate and decelerate the upward scarf slope formed at the rear end of the conveyance to approximately the center of the press fixing platen. The second pinch roller is automatically controlled by a computer to stand still as a buffer, and when the front end of the conveyance of the following spliced veneer is detected, the second pinch roller is disposed on the carry-in side of the welding place. and a second servo motor and a second rotary encoder to transport the preceding longitudinally spun veneer with the downward scarf slope formed at the front end thereof stationary at approximately the center of the press fixed platen. The computer tracks and accelerates/decelerates the amount of mutual conveyance so as to accurately overlap the upward scarf slope at the rear end, and the scarf is connected so as to stand still as a buffer and overlap with both. Therefore, the upward scarf slope to which adhesive is applied on the preceding longitudinally spliced veneer and the downward scarf slope on which adhesive is not applied to the succeeding vertically spliced veneer are placed on the press fixing plate where they are joined. Since it will be accurately superimposed on
A press movable platen facing the fixed press platen is actuated by a pressurizing cylinder, and the scarf overlapping portion of the preceding longitudinally spun veneer and the succeedingly spliced veneer is applied from above and below with a desired pressing force, for example, 10 KFI/ The preceding vertically spun veneer is compressed with a pressure of about ci, and a high frequency power of about 6 to 10 Kw is applied for several seconds using grid electrodes arranged in a staggered manner on the fixed press platen and the movable press platen. Then, the adhesive at the scarf overlapping portion of the subsequent spliced veneer is rapidly heated and cured to complete 1.1 bonding operation. In this case, the method of applying high-frequency power to the scarf overlapped portion of the preceding longitudinally spun veneer and the succeedingly spliced veneer is to apply the high frequency power to the press fixed platen side and the pressable vJ! (It is also possible to apply high-frequency power from the side using a flat plate electrode, but since the adhesive forms a short circuit diagonally across the wooden part of the veneer, there is a risk of burnout caused by the discharge of high-voltage, high-frequency power. In order to avoid this, the high frequency power is divided into low voltage high frequency power and applied to each individual from one side, for example, the grid electrode on the press fixed plate side, using a voltage dividing coil. Next, the intermediate product, which has completed the above-mentioned joining operation and has become a vertically spliced veneer, is then cut to a fixed length using a veneer clipper, etc. installed in the next process. The first rotary encoder detects the amount of conveyance of the first pinch roller and the computer connected thereto so that the product can be conveyed by a machine on a conveyor consisting of rollers and cut into products of a predetermined length. Products of a predetermined length, for example, about 4771 products, are automatically cut and stacked one after another in a product storage area.

[Example] An example forming a series of steps of the present invention is as shown in FIG.
On the top, the appropriate thickness and size, for example, 3 mtrr thickness, 1 m
A veneer veneer 1 with an angle of m is mounted and supplied to a composite scarf machine 3 from the fiber direction. Scarf machine 3 is the second
As illustrated in the figure, a pair of cutter blocks 3a and 3b facing each other in the front and back and top and bottom are cut at a desired inclination angle, for example, with a scarf slope (S) of about 4 to 8 times the thickness (1) of the veneer veneer 1. They are each constructed so as to be movable reciprocally in the conveying direction at an inclination angle of approximately 7 to 14 degrees. The reciprocating motion of the cutter blocks 3a and 3b may be either a linear movement mechanism using a crank or an arc swinging mechanism using an arm. Any scarf machine 3 may be used as long as it can form the downward scarf slope 2a and the upward scarf slope 2b symmetrically and in parallel. Further, the subsequent laminated 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 processed in the next process. A first veneer detector 5 consisting of a photoelectric switch, etc. installed on a conveyor 22 consisting of rollers, etc., detects the front end of the veneer or the rear end of the veneer, and detects the upward facing scarf to which adhesive should be applied. The arrival of the slope 2b is detected.

The detection signal transmitted by the first veneer detector 5 is a two-component mixed spray consisting of a main component of a bonding adhesive and a curing agent, which is connected to an airless pump unit or the like via a timer circuit 23 such as a timer. This is transmitted to the applicator 6, and an appropriate amount of the adhesive is sprayed in a timed manner only on the upward scarf slope 2b at the rear end of the subsequent plywood veneer 4 being conveyed directly below. . In this case, the conveyor 24 consisting of rollers etc. directly below the spray applicator 6 is
Since the adhesive is contaminated by spraying, it is common practice to soak it in a water tank 25 and wash it with water. On the other hand, the rear end portion of the transported veneer 7, which is first joined together with the succeeding laminated veneer 4 at the welding place 8 and transported to the next process, is transported to the welding place 8. The conveyance front end of the subsequent laminated veneer 4 to be brought in and joined is at the joining location 8 of both.
A second veneer detector 9 consisting of a photoelectric switch or the like installed on the limit side of the press fixed platen 8a alternately detects the conveyance rear end of the preceding spliced veneer 7. At this time, the first
pinch rollers 108, 1ob, a first servo motor 11 such as an AC type that drives the first pinch rollers 10a, 10b, and the first pinch rollers 10a,
A first rotary encoder 12 such as an absolute type that detects the conveyance amount of 1 ob, and a computer 16 connected to the first servo motor 11 and the first rotary encoder 12 are used to control the amount of the preceding laminated veneer 7. The upward scarf slope 2b at the rear end of the conveyance is made to stand still in a cushioning manner at approximately the center of the press fixing W8a by acceleration/deceleration control, and is kept in standby for joining with the succeeding veneer veneer 4 that will arrive next. . Further, when the conveyance front end of the subsequent spliced veneer 4 is detected, the second pinch rollers 13a, 13b arranged on the input side of the press fixed platen 8a and the second pinch roller 13a , 13b.
A second servo motor 14 such as a C type, a second rotary encoder 15 such as an absolute type that detects the conveyance amount of the second pinch rollers 13a and 13b, and a second servo motor 14 and the second rotary encoder 15, such as an absolute type The computer 16 connected to the rotary encoder 15 of Tracking and acceleration/deceleration control are performed so as to accurately overlap the upwardly facing scarf slope 2b at the rear end of the scarf 7, and the scarf is brought to rest for a buffering purpose. Therefore, the upward scarf slope 2b to which the adhesive of the preceding assembling veneer 7 is applied
Since the downward scarf slope 2a of the subsequent spliced veneer 4 to which no adhesive is applied is accurately superimposed on the press fixing MBa, which is the joint location 8 of both, the press fixing W8a The facing press movable platen 8b is actuated by the pressurizing cylinder 8C, and the scarf overlapping portion of the preceding assembling veneer 7 and the succeeding assembling veneer 4 is applied from the vertical direction with a desired pressing force of, for example, 10 kg/crtr. grid electrodes 17a arranged in a staggered manner on the press fixed platen 8a and the press movable platen 8b;
17b, a high frequency power of 6 to 10 Kw culm strength is applied for several seconds to separate the preceding grouped veneer 7 and the subsequent grouped veneer 4.
The adhesive at the overlapping part of the scarves is rapidly heated and cured, completing one joining operation. In this case, the method of applying high frequency power to the scarf overlapping portion of the preceding spliced veneer 7 and the succeeding spliced veneer 4 is to use flat electrodes from the press fixed WBa side and the press movable platen 8b side using a conventional method. However, as illustrated in FIG. 3, it is also possible to connect a divided voltage feeding coil 19 to the high frequency power source 18 and to apply high frequency power to the press stationary platen 8a and the press movable plate 18b in a staggered manner. One side of the arranged grid electrodes 17a, 17b, for example, the grid electrode 17a arranged on the press fixed platen 8a as shown in the figure, is individually connected to the voltage dividing fIi electric coil 19 to divide it into low voltage high frequency power. The scarf overlapping portion 26 of the preceding longitudinally spliced veneer 7 and the succeeding spliced veneer 4 is subjected to high-frequency heating in a pressed state. Next, the intermediate product 27, which has completed the above-mentioned joining operation and has become the vertically spliced veneer 7, is subsequently cut into a length cutter 20, which is a veneer clipper 288, which is installed in the next process, and is cut by a roller, etc. Conveyed on conveyor 29.30,
A predetermined length is determined by the first rotary encoder 12 which detects the conveyance amount of the first pinch rollers 10a, 10b which are pinching and conveying the preceding longitudinally spliced veneer 7, and the computer 16 connected thereto. For example, the products are automatically cut into approximately 4 m long products and stacked one after another in a product storage area.

〔Effect of the invention〕

As explained above, the present invention provides a multifunctional scarf machine that can alternately cut downward scarf slopes and upward scarf slopes, and selectively applies adhesive to the - side scarf slopes. A spray applicator that can
This veneer veneer vertical stripping machine is equipped with a veneer motor, a rotary encoder, and a computer-based positioning mechanism in a series of processes, allowing cushioning acceleration/deceleration conveyance without forward/reverse rotation, so it can perform the scarf cutting process unlike conventional equipment. Adhesive application [Not only was the process divided and required a large number of workers, resulting in inefficiency, but also because the scarf slopes at the front and rear ends of the conveyor, which were sharply formed, collided with stoppers each time to align them. There is also the problem of damage to the material, and the possibility of breakage of the joint due to the excessive lubricity of the forward and reverse rotation when vertically spliced veneers that have been joined in long lengths are rotated in forward and reverse directions on a conveyor and then joined into even longer lengths. This invention has overcome all the drawbacks, and is an extremely effective invention that can be implemented in industry.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the arrangement of a series of steps, Fig. 2 is an explanatory drawing showing the operation mode of the composite scarf machine, and Fig. 3 is an explanatory drawing showing the method of applying high frequency power using a grid electrode. DESCRIPTION OF SYMBOLS 1...Plywood veneer, 2a, 2b...Scarf slope, 3...Combined scarf machine, 3a, 3b...Cutter block, 4...Following plywood veneer, 5...No. 1 veneer detector, 6... spray applicator, 7... leading vertically spliced veneer, 8... joint location, 8a... press fixed platen, 8b... press movable platen, 9... ...Second veneer detector, 10a, 10b...First pinch roller-11
...first servo motor, 12...first rotary encoder 13a, 13b...second pinch roller 14...second servo motor, 15...second rotary encoder, 16... Computer 17a, 17b... Grid electrode, 18... High frequency power supply, 19. ...Divided voltage feeding coil, 20... Cutting to a fixed length i.

Claims (1)

[Claims] 1. The front end of the veneer veneer (1) being transported in the fiber direction is cut into a downward scarf slope (2a), and then the rear end of the transport is also cut into an upward scarf slope (2a). 2b) A first veneer detects the conveyance front end or the conveyance rear end of the composite scarf machine (3) that cuts the composite scarf machine (3) and the subsequent longitudinally spliced veneer (4) that is carried out from the composite scarf machine (3). A spray applicator (6) detects the adhesive using the device (5) and applies the adhesive in a timed manner to the upward scarf slope (2b) formed at the rear end of the conveyance; The conveyance rear end of the veneer (7) and the subsequent longitudinally spun veneer (4)
) for alternately detecting the conveyance front end of the press fixing platen (8a) on the loading side of the press fixing platen (8a), which is the joint location (8) of both, and the unloading of the press fixing platen (8a). The preceding vertical stripping veneer (7) is carried out by the first pinch rollers (10a, 10b) installed on the sides and the first servo motor (11).
The first rotary encoder (1
2), and a second rotary encoder (15) that detects the conveyance amount of the second pinch rollers (13a, 13b) and the second servo motor (14) installed on the loading side of the press stationary platen (8). The detection signals of the first and second rotary encoders (12, 15) are compared, and the conveyance amount of the preceding longitudinally spun veneer (7) by the first servo motor (11) is determined by comparing the detection signals of the first and second rotary encoders (12, 15). A veneer veneer longitudinal stripping device characterized by comprising a computer (16) connected to a computer (16) capable of freely controlling the tracking and acceleration/deceleration of the conveyance of the succeeding longitudinally stripped veneer (4) by a second servo motor (14). 2. The veneer veneer vertical stripping device according to claim 1, wherein a pair of cutter blocks (3a, 3b) facing each other in the front and rear and up and down directions are installed so as to be movable back and forth in the conveying direction at a desired angle of inclination. 3. The continuous vertical stripping device for veneer veneers according to claim 1, wherein grid electrodes (17a, 17b) are arranged in a staggered manner on the fixed press platen (8a) and the movable press platen (8b). 4. The veneer veneer vertical stripping device according to claim 1, wherein the grid electrodes (17a) on the side of the press fixing platen (8a) are individually connected to a partial voltage feeding coil (19) of a high frequency power source (18). 5. A fixed length cutting machine (20
2. The veneer veneer vertical stripping device according to claim 1, wherein said veneer veneer vertical stripping device is arranged such that the vertical stripping device is controlled in proportion to the amount of conveyance.