JPH047962B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is a veneer veneer board whose ends have been previously processed into scarves with contrasting slopes, and where adhesive has been applied to both sides or one side of the board surface. , LVL (laminated veneer lumber) or LVB (laminated veneer board), in which the scarf parts are overlapped and the overlapped parts are shifted in a step-like manner to create an intermediate product with a predetermined number of laminated layers. This relates to an automatic assembly method used in the manufacturing process of laminated veneer materials, commonly known as .

(b) Prior art A method and device for assembling this type of laminated veneer material according to the prior art is disclosed in, for example, Japanese Patent No. 982535 (Japanese Patent Publication No.
No. 14641) "A device that sequentially abuts the tip of a veneer veneer being conveyed by a multi-row roller to stop its conveyance step by step," as disclosed in the continuous manufacturing apparatus for laminated veneer materials, etc. A large number of stopper groups that can be raised and lowered freely, and the veneer veneers that are stopped in stages by the stopper groups are dropped directly below each time by a lifting mechanism attached to the multi-row rollers, thereby joining the veneer veneers in the stacking process. The machine was designed to produce laminated veneer material with stepped sections.
A so-called butt joint type device that uses a large number of fixed stopper groups to stack a predetermined number of layers of intermediate products one by one at a fixed location, or a patent application published in 1982-500126 for laminated wood. As disclosed in the manufacturing method and manufacturing equipment, etc., it is possible to stop the conveyance in stages by sequentially moving and coming into contact with the cut end of the wood veneer being conveyed by a conveyor. A single stopping device is used to press the wood veneer, which is stopped step by step by the single stopping device, and the wood veneer is moved directly downward each time by a gripping device, so that the joint portion of the wood veneers in the process of being laminated is shaped like a step. By using the so-called scarf joint method, "a single movable stopping device moves the stopping points of each wood veneer from point to point to keep it at a predetermined position." There was a device that was designed to continuously process intermediate products with multiple layers.

(c) Problems to be Solved by the Invention As mentioned above, the method and device for constructing this type of laminated veneer material according to the prior art has been described as follows: A structure in which the mutual tip joints of the veneers are stacked in a shape in which each layer is staggered at a predetermined interval in the construction direction while the veneer is dropped directly below, or a single movable stop device. The laminated veneer is moved directly below the veneer to be laminated, which has been stopped in stages, and the veneers are laminated in such a manner that the joints of the mutual ends of the veneer are shifted by a predetermined interval for each layer in the construction direction. In both cases, when the veneer to be laminated is dropped or moved to the assembly area directly below, the falling position of the tip of the veneer is affected by inertia and friction, and the position at which the tip of the veneer falls is shifted forward or backward in the conveyance direction. In other words, the intermediate product not only deviates significantly back and forth in the construction direction, causing overlaps and tunnels at mutual tip joints, but also
In a system conveyor that performs intermittent conveyance, there is always a back-and-forth shift in the system position due to fluctuations in the stop position, and there is also a large deviation in the direction orthogonal to the system direction, that is, to the left and right of the intermediate product, and the end joints of each other are In order to eliminate this problem of sheet slippage in the structural direction and in the orthogonal direction, the present invention aims to eliminate the problem of sheet slippage in the structural direction and in the orthogonal direction. A fixed or movable stopper installed at one or several locations on the ring conveyor determines the transfer origin of the veneer in the construction direction of the laminated veneer, which has been processed into a scarf and coated with adhesive on both or one side. Then, after detecting the deviation from the conveyance reference line in the direction orthogonal to the construction direction and detecting the fluctuation of the stop position of the construction conveyor, the veneer is placed on one or several locations on the side construction conveyor. The transfer robot moves the scarves in parallel while correcting deviations from the transport reference line and fluctuations in the assembly position, and transfers the scarves to the assembly location by shifting the scarf stacking points of each layer by a predetermined interval in the assembly direction and stacking them. It was constructed in such a way.

(d) Means for solving the problem The present invention provides a means for applying an adhesive to both or one side of the veneers to be laminated, a means for determining the origin of transfer with respect to the construction direction of the veneers to be laminated, and A means for detecting and correcting the deviation of the veneer to be laminated from a conveyance reference line in a direction perpendicular to the construction direction, and furthermore, a means for shifting and overlapping the scarf overlapping points of each layer of the veneer to be laminated by a predetermined interval in the construction direction. As a means of transferring a. Glue spreader that applies adhesive to both or one side of the veneer to be laminated.

b. A stopper that stops the tip of the laminated veneer.

c. A line sensor that detects the conveyance reference line of the laminated veneer.

d An encoder that detects changes in the stop position of the structured conveyor.

e Transfer with a suction or pricking device that transfers the laminated veneers onto the side conveyor system in a manner that shifts and stacks them at predetermined intervals while correcting computer setting values based on the detection signals of the line sensor and encoder. Robot.

This is an automatic method for assembling veneer laminated materials, in which veneer laminated materials are arranged in a series of steps and laminated in a staggered manner by automatic operation.

(E) Function The glue spreader of the above a) of the present invention is obtained by modifying a conventionally well-known double-sided coating type glue spreader in which sets of a spreader roll and a doctor roll are disposed on the upper and lower sides. A set of spreader rolls and doctor rolls on either the lower or upper side and a set of pinch rolls installed separately on the lower or upper side are switched alternately or simultaneously,
That is, when this glue spreader is used as a single-sided application type, the pair of spreader roll and doctor roll on either the lower or upper side is moved outward by an air cylinder or the like, and the pinch roll is used instead. This is made possible by sliding the assembly inward using an air cylinder, etc., and if necessary, it is also possible to pause the application of adhesive, and it is a switchable type that can apply both sides to one side and pause the application. A glue spreader with the same function, such as an extruder or an airless sprayer.

In addition, the stopper b) is used to move the tip of the veneer to be laminated, which is conveyed by ring rolls arranged in multiple stages with adhesive applied to both or one side, to the transfer origin in one to several locations in the construction direction. It is a device for stopping the X, and usually the final stage stopper is a fixed type, and the intermediate stage stopper is a movable type configured to be able to move up and down with an air cylinder etc. If the location is spread over several locations, the final stage stopper and intermediate stage stopper are illustrated in Fig. 4. Intermediate product 1
In the structure shown in FIG. For each predetermined interval P of the mating points 3, for example, the assembly is constructed in multiple stages at intervals of about 20 to 30 times the plate thickness t, and the transfer origin X in the initial construction direction is determined.

Furthermore, the line sensor (c) above is generally composed of a photoelectric switch device in which light emitting/receiving diodes etc. are movably arranged at multiple points or together with a cylinder equipped with an encoder, a photoelectric cell divided into multiple stages, etc. It is mainly a photoelectric type line sensor or image sensor, which detects the presence or absence of a detected object in a linear manner and detects its deviation by outputting the detection signal to a computer etc. Any ordinary deviation detection device with the same effective function is sufficient.

Next, the encoder d) is a device capable of detecting fluctuations in the stop position due to intermittent conveyance of a structured conveyor, and usually a rotary encoder or the like is mounted on the structured conveyor to generate pulse signals. The change in the stop position is detected based on the integrated value of .

Furthermore, the transfer robot equipped with the suction or sticking device described in e) above transfers the veneers to be laminated, which are once stopped at one to several transfer origins X in the direction of the structure, to one or more of the veneers on the side structure conveyor. The system is moved to several assembly locations while correcting deviations from the transport reference line Y-Y using a line sensor and computer, and fluctuations in the assembly position due to changes in the stop position of the assembly conveyor are corrected during movement. It is a structural device for stacking intermediate products in a continuous manner, and the suction or sticking device attached to the head is connected to the suction box by an exhaust device such as a blower or fan. Approximately the entire area of the veneer to be laminated with adhesive applied to the blade-shaped suction part is adsorbed in a floating position, and when the veneer to be laminated which has been adsorbed in this floating position reaches the predetermined assembly location, the air is exhausted. Either cut off the veneer to release the previous adsorption, or instead of adsorption, pierce the veneer with a nail, needle, etc. using an air cylinder, etc., and stick it in a floating state, or In addition to being operated to release the stuck object by a separate pull-out bar, etc., the transfer robot is basically a multi-jointed robot that can move horizontally, vertically, and vertically. It consists of a well-known device such as a table with a vertical movement mechanism such as an air cylinder, or a multiple device in which the same device is connected in a turret type, and these transfer robots are set in advance. The transfer operation is based on instructions from the computer regarding the transfer route and transfer location of the laminated veneers, and furthermore, the transfer operation is controlled by the deviation signal of the transfer reference line Y-Y from the line sensor and encoder, and the left and right movement and movement of the structured conveyor are controlled. The transfer operation is automatically controlled to complete the transfer operation while correcting the change in the assembly position due to the change in the stop position.

(F) Example The arrangement of the apparatus for carrying out the automatic assembly method of the present invention is as illustrated in FIGS. 4 for thickness t
A contrasting scarf 2a with a slope S of ~8 times,
The laminated veneer 2 processed into 2b is transferred to a roll conveyor 4
While conveying the fiber in the direction of the fiber, an appropriate amount of adhesive is applied to both or one side of the fiber using a switchable glue spreader 5, an extruder with the same function, an airless sprayer, or the like. The glue spreader 5 of the above embodiment is equipped with upper and lower spreader rolls 5a, 5b and doctor rolls 5c, 5d in a double-sided coating type, and also has pinch rolls 5e, 5f which are movable by an air cylinder or the like. In the case of single-sided coating, the spreader roll 5a or 5b and the doctor roll 5c or 5d on either side are slid outward by the operation of an air cylinder, etc. The pinch roll 5e or 5f slides inward by the operation of an air cylinder or the like, and the spreader roll 5 on either side, including the pause in the application,
The device is arranged such that single-sided coating and double-sided coating can be performed alternately by switching operations using a or 5b and a doctor roll 5c or 5d. Therefore intermediate product 1
The upper and lower spreader rolls 5a, 5b and doctor rolls 5c, 5d are removed from the laminated veneer 2 that does not require the application of adhesive for the first layer, the final layer, or the intermediate odd-numbered layers. At the same time, the upper and lower pinch rolls 5e and 5f are moved inward to stop applying 5 g of adhesive to the upper and lower layers, and also to the first layer of the intermediate product 1 that does not require applying 5 g of adhesive. The upper and lower spreader rolls 5a, 5b and doctor rolls 5c, 5d are slid outward and the upper and lower pinch rolls are applied to the intermediate even-numbered layers of the veneer 2 to be laminated, excluding the final layer or the intermediate odd-numbered layers. Rolls 5e, 5f
inward to stop the application of 5 g of adhesive on each of the upper and lower layers, and also remove the intermediate product 1 except for the first layer, the final layer, or the intermediate odd-numbered layer that does not require application of 5 g of adhesive. The even-numbered laminated veneer 2 includes:
Either the upper and lower spreader rolls 5a, 5b and the doctor rolls 5c, 5d are slid inwardly, and the upper and lower pinch rolls 5e, 5f are slid outwardly to apply the adhesive 5g on both sides, or either the upper or lower The single-sided coating is applied to all the veneers 2 to be laminated in the intermediate layer except for the first layer and the final layer of the intermediate product. Then, the veneer 2 to be laminated, which has been coated with adhesive on both or one side using the glue spreader 5, an extruder with the same function, an airless sprayer, etc., or which has passed freely without being coated, is subsequently stacked in multiple stages. The ring conveyor 6 continues to transport the ring conveyor 6, and a fixed stopper 7 and an air cylinder 8a are installed at one or several locations (two locations in the case of illustration) at the end portion of the ring conveyor 6 and the intermediate portion thereof. When its tip collides with a movable stopper 8 equipped with a ring conveyor 6, the ring conveyor 6 remains rotated and the veneer 2 to be laminated is stopped parallel to the entire surface by the stoppers 7 and 8, and the stopping position is changed in the subsequent process. Laminated veneer 2 in the construction direction during construction operation
This is the transfer origin X.

On the other hand, on one side of the ring conveyor 6 that conveys the laminated veneers 2, a fixed stopper 7 is installed at one or several locations (two locations in the illustrated case).
A plurality of line sensors 12a to 12d on the conveyance reference line Y-Y correspond to the stopping position of the laminated veneer 2 by the movable stopper 8, and detect the position perpendicular to the conveyance reference line Y-Y. One or more line sensors are installed so that the lines are oriented in a row, so that deviations from the conveyance reference line Y-Y, which is set approximately at the center of the line sensors 12a to 12d, are automatically detected each time a restraining operation is performed. The detection signal is sent to the computer 13, and during the transfer operation of the transfer robot 10 based on instructions from the computer 13 regarding the preset transfer route and transfer location of the laminated veneer 2, the transfer operation is performed. In order to automatically correct the deviation from the reference line Y-Y, that is, the movement in and out to the left and right, and also to correct the fluctuation of the stop position due to the intermittent conveyance of the structure conveyor 9, which is the setting location, In order to correct the fluctuations, an encoder 14 is mounted on the conveyor system 9, and the integrated pulse signal is sent to the computer 31 to automatically correct the longitudinal deviation during the transfer operation. .

The veneers 2 to be laminated, which are stopped at one or several transfer origins X on the ring conveyor 6, are transferred to a structured conveyor consisting of an endless belt or the like disposed parallel to the side of the ring conveyor 6. One or more transfer robots 10 equipped with suction or sticking devices are installed so as to be able to move in parallel corresponding to one to several (two in the illustrated case) assembly locations formed on the robot 9. , the laminated veneer 2 on the ring conveyor 6 is placed behind the intermediate product 1 on the structured conveyor 9,
For example, a transporter such as an articulated robot shown in the figure is used to shift and stack the scarf overlapping parts 3 of each layer by a predetermined interval P, for example, at intervals of about 20 to 30 times the plate thickness t. In the case of the loading robot 10, the computer 13 automatically controls operating mechanisms such as servo motors built into the multi-joint parts, and operates the robot so as to be able to move horizontally, vertically and vertically. While the intermediate products 1 are assembled in a continuous manner at one or several assembly locations (two locations in the illustrated case), the assembly is performed in a continuous manner by intermittent operation of the assembly conveyor 9 corresponding to the pasting cycle of the subsequent process. The intermediate product 1 thus produced is delivered to a heat-pressing device such as a high-frequency tack press or a continuous hot press in a subsequent process. In the case of the illustrated transfer robot 10, a suction device 11 is attached to the head 10a, and the suction box 11a of the suction device 11 is attached to the head 10a.
The adhesive is applied to almost the entire area of the laminated veneer 2 so that it can be sucked in a floating manner, and the suction part is provided with a saw blade-shaped separator and a ventilated suction member 11b.
Although not shown, a vertical operating mechanism such as an air cylinder is installed inside the head 10a to control the suction force of an exhaust device such as a blower or fan connected to the exhaust pipe 11c. Due to the action and its vertical movement, the laminated veneer 2 held parallel to the transfer origin X in the arrangement direction is accurately adsorbed as it is to the saw-blade-shaped suction member 11b, and is further transferred to the arrangement conveyor. 9, move in parallel while correcting the left and right movement in and out and the front and rear deviations, release the suction at the scarf overlapping point 3 at one to several (two in the case of the illustration) assembly locations, and shift sequentially. An automatic system operation is performed to transfer the items one on top of the other. Then, from the transfer origin X to the laminated veneer 2
from its deviation with respect to the conveyance reference line Y-Y to the respective scarf overlapping points 3 when moved in parallel while correcting the movement in and out to the left and right, and the change in the structure position due to the change in the stop position of the structure conveyor 9. The amount of movement of the X and Y axes is detected by an encoder attached to the operating mechanism such as the servo motor, and is stored in the computer 13 in advance and compared with the corrected set value. By automatically controlling the amount of movement of the actuating mechanism, it is possible to accurately align the scarf overlapping location 3 with shifted overlapping while correcting left/right in/out and front/back deviations each time.

(g) Effects of the invention As stated above, the present invention is based on the following: ``Both ends of the scarves are processed into contrasting scarves, and the veneers to be laminated with adhesive applied to both or one side of the scarves are placed at one or several locations on a ring conveyor. The fixed or movable stopper installed determines the transfer origin X of the veneer in the construction direction, detects the deviation from the conveyance reference line Y-Y in the direction orthogonal to the construction direction, and stops the construction conveyor. After detecting the positional variation, the veneer is transferred to one or several assembly locations formed on the side assembly conveyor using a transfer robot to detect the deviation from the conveyance reference line Y-Y and the assembly position variation. The scarves are moved parallel to each other while being corrected, and the overlapping points of each layer are shifted by a predetermined interval before being transferred. There are those in which the restrained veneers to be laminated are dropped directly below, and the joints of the mutual ends of the veneers are stacked in a shape in which each layer is shifted at a predetermined interval in the construction direction, or it is movable. While the veneers to be laminated are stopped in stages by a single stopping device, the mutual end joints of the veneers are shifted in the construction direction by a predetermined interval for each layer, and the veneers are laminated in an overlapping shape. When the veneer to be laminated is dropped or moved to the assembly area directly below, the falling position of the tip of the veneer is affected by inertia and friction, and the falling position of the tip of the veneer is in the transport direction. In other words, there is a large shift back and forth in the assembly direction of the intermediate product, which not only causes overlaps and tunnels at the mutual end joints, but also causes a shift in the assembly position before and after the assembly position due to fluctuations in the stop position of the assembly conveyor that involves intermittent conveyance. There is always a misalignment of the product, and there is also a large misalignment in the direction perpendicular to the construction direction, that is, to the left and right of the intermediate product, which is important for functionality and quality, such as creating stairs on the sides of the mutual end joints. According to the present invention, the veneer to be laminated, which is restrained at the transfer origin X in the construction direction, can be accurately held by a large-area suction or sticking device. During the movement, the system detects the deviation from the transport reference line Y-Y, detects the stop position of the system conveyor, and corrects the memory of the initial set value while parallel to the X and Y axes and the system conveyor. Using a transfer robot that moves scarves according to the positional deviation, the scarf stacking point for each layer is transferred to a slightly fluctuating structure position without going in and out left and right, accurately shifting it at predetermined intervals and stacking it continuously. Since this method is designed to be assembled into intermediate products in the form of a shape, it is difficult to move the laminated veneer back and forth and left and right due to inertia and friction with respect to the moving speed of the laminated veneer, which was caused when the conventional technology simply dropped or moved it directly below the assembly location. This completely eliminates misalignment, and even if the stop position of the conventional conveyor system fluctuates, it is possible to efficiently produce high-quality intermediate products without overlaps, tunnels, or stairs through automatic operation.

[Brief explanation of drawings]

The figures show an example of the implementation of the present invention, in which Fig. 1 is an explanatory diagram showing the arrangement of the entire device, Fig. 2 is a side view showing the arrangement of the glue spreader, ring roll, stopper, and line sensor, and Fig. 3 is an explanatory diagram showing the arrangement of the entire device. The figure is Figure 1A
4 is a side view of an intermediate product in the assembly process. 1... Intermediate product, 2... Laminated veneer, 2a, 2b...
Scarf, 3... scarf overlapping location, 5... glue spreader, 7, 8... stopper, 9... structured conveyor, 10... transfer robot, 12... line sensor, 13... computer, 14... encoder.

Claims (1)

[Claims] 1 Applying adhesive to both sides or one side of the laminated veneer, which has been processed into a scarf with contrasting slopes on both sides in the direction of the fibers, using a glue spreader, and applying the adhesive and conveying. The tip of the veneer to be laminated is stopped by a stopper installed at one or several locations to determine the origin of transfer to the structured conveyor, and the mechanism of the veneer to be laminated that determines the origin of transfer to the structured conveyor. Detecting deviation from a conveyance reference line in a direction orthogonal to the direction using a line sensor; detecting fluctuations in a stop position due to intermittent conveyance of the structured conveyor using an encoder; and determining a transfer origin for the structured conveyor. Then, the veneers to be laminated whose deviation from the conveyance reference line in the direction orthogonal to the construction direction has been detected are transferred to the line sensors and encoders corresponding to one or several assembly locations formed on the side assembly conveyor. The deviation signal from the conveyance reference line detected by the conveyance reference line and the fluctuation signal of the structure position are sent to a computer, and the setting values are corrected each time, while a transfer robot equipped with a suction or sticking device installed so that it can move in parallel is used to transfer each layer to a computer. 1. An automatic method for assembling laminated veneer material, characterized in that the overlapped parts of the scarves are shifted and stacked at predetermined intervals in the assembling direction and then transferred.