JPH0438204B2 - - 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 an 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) Conventional method A method and device for assembling this veneer laminated 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 the 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 stoppers to assemble a predetermined number of layers of intermediate products one by one at a fixed assembly location, or the production of laminated lumber as disclosed in Patent Application Publication No. 59-500126 As disclosed in the ``method and manufacturing apparatus, etc.,'' the conveyor moves sequentially and comes into contact with the cut ends of the wood veneers conveyed by the conveyor, thereby stopping the conveyance in stages. The wood veneer, which is stopped in stages by the single stop device, is moved directly downward each time by a pressing and gripping device, so that the joints of the wood veneers in the process of being laminated are shaped like steps. 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. Therefore, in any of these methods, it is impossible to automatically insert a cross band in which the fiber direction of the laminated veneers is changed to the orthogonal direction, and the laminated veneers are dropped or moved to the assembly location directly below. At the same time, due to the influence of inertia and friction, the falling position of the tip of the veneer deviates significantly back and forth in the conveyance direction, that is, back and forth in the assembly direction of the intermediate product, resulting in overlap and tunnels at the mutual tip joints. This is a serious problem in terms of function and quality, as it not only causes a large deviation in the direction perpendicular to the construction direction, that is, to the left and right of the intermediate product, but also causes stairs on the sides of the mutual end joints. Therefore, in order to eliminate the sheet misalignment in the construction direction and the orthogonal direction, the present invention has been developed by ``processing both ends into contrasting scarves, and subtracting the scarf slope S from the total length l of both end faces. The veneer to be laminated is cut with a double saw or the like at the interval (l-S) and coated with adhesive on both or one side, and then the veneer is cut by a fixed or movable stopper installed at one or several locations on the ring conveyor. After determining the transfer origin with respect to the construction direction and detecting the deviation from the conveyance reference line in the direction orthogonal to the construction direction, one or several assembly locations where the veneer is formed on the side construction conveyor are determined. The transfer robot moves the scarves in parallel while correcting the deviation from the conveyance reference line, so that the scarf overlapping portions of each layer are shifted by a predetermined interval in the construction direction, and the laminated veneers become a cross band. "It is constructed so that the fiber direction of the material is changed to the perpendicular direction for transfer."

(d) Means for solving the problems The present invention provides a means for cutting both end surfaces of the veneer to be laminated at a predetermined interval, a means for applying an adhesive to both or one side of the veneer to be laminated, and means for determining the transfer origin in the construction direction of the laminated veneers;
and means for detecting and correcting the deviation from the conveyance reference line in the direction orthogonal to the construction direction of the laminated veneer;
(a) as means for shifting and stacking the scarf overlapping parts of each layer of the laminated veneers by a predetermined interval in the construction direction, and for changing the fiber direction of the laminated veneers to the orthogonal direction; A double saw that cuts both end faces of laminated veneers at specified intervals.

(b) A glue spreader that applies adhesive to both or one side of the veneer to be laminated.

(c) A stopper that stops the tip of the laminated veneer.

(d) A line sensor that detects the conveyance reference line of the laminated veneer.

(e) Transfer the veneers to be laminated onto a side mechanical conveyor by shifting them at predetermined intervals and stacking them, while correcting the setting values of the computer based on the detection signal of the line sensor, and transfer the veneers of the veneers to be laminated. A transfer robot equipped with a suction or sticking device that changes direction to the orthogonal direction.

This is an automatic construction direction for laminated veneer materials, in which the laminate is arranged in a series of steps and laminated in a staggered manner while inserting cross bands between appropriate layers by automatic operation.

(E) Function The double saw described in (a) of the present invention uses, for example, an electric circular saw facing each other on both sides to cut both end surfaces of the laminated veneer during the conveyance process vertically or at an appropriate angle. The width of the board is cut at a predetermined interval, that is, the interval (l-S) obtained by subtracting the scarf slope S from the total length l of the laminated veneer, and it has the same function. Of course, other cutting tools such as knives and planers may be used if necessary.

In addition, the glue spreader mentioned in (b) above is made by modifying a conventionally well-known double-sided coating type glue spreader in which sets of a spreader roll and a doctor roll are installed on the upper and lower sides. In other words, this glue spreader is used as a single-sided application type so that the spreader roll and doctor roll set on either side and the pinch roll set separately installed on the lower or upper side are switched alternately or simultaneously. In this case, the pair of spreader roll and doctor roll on either the lower or upper side is slid outward by an air cylinder, etc., and the pair of pinch rolls is slid inward by an air cylinder, etc. This is made possible by the switch type glue spreader, which can perform double-sided coating on one side and pause the coating, or a glue spreader with the same function.

In addition, the stopper (c) above is used to transfer the leading end of the veneer to be laminated, which is conveyed by ring rolls arranged in multiple stages with adhesive applied to both or one side, in one or several locations in the construction direction. It is a device for stopping at the origin X, and usually the final stage stopper is a fixed type, and the intermediate stage stopper is a movable type configured to be movable up and down by an air cylinder etc. In the case where there are several assembly locations, the stopper at the final stage and the stopper at the intermediate stage are 4 to 8 times the thickness t from the total length l of the laminated veneer 2 in the configuration of the intermediate product 1 illustrated in Fig. 4. erect them at intervals (l-S), or at predetermined intervals P at the scarf overlapping points 3 for each layer.
For example, the structure 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 (d) above is generally 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, or a photoelectric cell divided into multiple stages. A photoelectric line sensor, commonly known as an image sensor, that linearly detects the presence or absence of an object to be detected and detects its deviation by outputting the detection signal to a computer, etc. Alternatively, any ordinary deviation detection device having the same effective function may be sufficient.

Next, the transfer robot equipped with the suction or sticking device described in (e) transfers the veneers to be laminated, which have been stopped at the transfer origin X in one to several locations in the structure direction, onto the side structure conveyor. The veneer to be laminated is transferred to one or several assembly locations while the deviation from the transportation reference line Y-Y is corrected during movement using a line sensor and computer, and the fiber direction of the laminated veneer is orthogonalized as necessary. It is a structural device for changing the direction and stacking the intermediate products in a continuous manner, and the suction or sticking device attached to the head of the device connects an exhaust device such as a blower or fan to the suction box. Almost the entire area of the veneer to be laminated with adhesive applied to the saw-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. Either cut off the exhaust gas to release the previous suction, or instead of suction, pierce the veneer with an air cylinder using a nail, needle, etc., and stick it in a floating state. In addition to being operated to release the stuck object in a floating form using a separate pull-out bar, etc.
The transfer robot is basically a multi-joint robot that can move horizontally, vertically, vertically and rotate at right angles, or a well-known device that has an XY table or the like attached with a vertical movement mechanism such as an air cylinder and a right angle rotation mechanism, or the same device. These transfer robots are constructed of multiple devices connected in a turret type, and these transfer robots respond to instructions from a computer regarding the transfer route and transfer location of the structure of the laminated veneers set in advance. The transfer and rotation operations are automatically controlled to complete the transfer and rotation operations based on this, while correcting the left and right entry and exit based on the deviation signal of the transport reference line Y-Y from the line sensor. It is something.

(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 veneer 2 to be laminated in the fiber direction by, for example, the width of the veneer 2 to be laminated, the width of the veneer 2 to be laminated is cut using double saws 14a, 14b such as electric saws or an equivalent device. The distance (l-
S) is equipped with a device capable of cutting in an adjusted manner, and can be freely controlled so as to selectively adjust and cut only the entire amount of the laminated veneers 2 during the conveyance process or only the cross band 15 by changing the fiber direction to the orthogonal direction. The equipment is installed in In addition, the double saw 14
The laminated veneer 2 which has been adjusted and cut at a predetermined interval (L-S) by a and 14b is cut on both sides or one side with a switchable glue spreader 5 or a glue extruder with the same function. Apply an appropriate amount of adhesive. 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 5a or 5b on either side and the doctor roll 5c or 5d can coat one side or both sides, including when the coating is stopped. The device is arranged such that application is performed alternately by switching operations. Therefore, the upper and lower spreader rolls 5a, 5b and the doctor roll are used for the laminated veneer 2 that does not require the application of adhesive for the first layer, the final layer, or intermediate odd-numbered layers of the intermediate product 1. 5c, 5d outward and upper and lower pinch rolls 5e, 5
f inward to stop applying 5 g of adhesive on the upper and lower sides, and also apply 5 g of adhesive on the intermediate product 1.
The upper and lower spreader rolls 5a, 5b and doctor rolls 5c, 5d are applied to the first layer, the final layer, and the intermediate even-numbered layers excluding the intermediate odd-numbered layers, which do not require coating. Inwardly, the upper and lower pinch rolls 5e and 5f are moved outward to apply the adhesive 5g to both sides, or apply the adhesive to one side of either the upper or lower side as the first layer of the intermediate product. This operation is performed on all the veneers 2 to be laminated in the intermediate layer except the final layer. Then, the laminated veneer 2 that has been coated with adhesive on both sides or one side by the glue spreader 5 or a glue extractor with the same function, or that has passed freely without being coated, is subsequently arranged in multiple stages. The ring conveyor 6 continues to transport the ring conveyor 6, and a fixed stopper 7 and air cylinders 8a, 8 are installed at one or several locations (two locations in the illustrated case) at the end portion of the ring conveyor 6 and its intermediate portion.
When the tip of the ring conveyor 6 collides with a movable stopper 8 equipped with a stopper 8, the ring conveyor 6 rotates, and the stoppers 7 and 8 stop the veneer 2 to be laminated parallel to the entire surface, and the stopping position is changed in the subsequent process. This serves as the transfer origin X of the laminated veneers 2 in the construction direction during construction operations.

On one side or 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. The deviation from the reference line Y-Y, that is, the movement in and out of the left and right sides is automatically corrected.

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,
The scarf overlapping parts 3 of each layer are shifted and stacked at a predetermined interval P, for example, at intervals of about 20 to 30 times the board thickness t, and then transferred in a continuous manner, and during the transfer process, the laminated veneer When 2 is a cross band 15 that changes the fiber direction in a perpendicular direction, a transfer robot 1 such as an articulated robot shown in the figure is used to transfer the cross band 15 after changing the direction at right angles.
In the case of 0, the operating mechanism such as a servo motor installed in the multi-joint part is automatically controlled by the computer 13, and is operated so as to move horizontally, vertically, vertically, and rotate freely. While continuously assembling intermediate products 1 with cross bands 15 inserted between arbitrary layers at one to several (two in the case of illustration) assembling locations, the assembly conveyor 9 corresponds to the pasting cycle of the normal subsequent process. By intermittent operation, the continuous intermediate product 1 is delivered to a subsequent process, such as a high-frequency tack press or a continuous hot press, to a heat-pressing device. In the case of the illustrated transfer robot 10, the suction device 1 is mounted on the head 10a that can rotate at right angles.
1 is attached, and the suction box 11a of the suction device 11 is able to suction by floating almost the entire area of the laminated veneer 2 coated with adhesive, and the suction part has a suction box 11a. A saw blade-shaped isolation and ventilation suction member 11b is installed in a mesh pattern, and although not shown, a vertical movement mechanism such as an air cylinder and a right-angle rotation mechanism are installed in the head 10a to exhaust air. The laminated veneer 2 is held in parallel to the transfer origin X in the assembly direction by the suction force of an exhaust device such as a blower or fan connected to the pipe 11c, as well as its vertical movement and right angle turning action. is accurately adsorbed as it is on the saw-blade-shaped suction member 11b, and then moved in parallel onto the assembly conveyor 9 while correcting its right and left entry and exit to one to several (two locations in the case of illustration) assembly locations. At the scarf stacking point 3, suction is released, the scarves are sequentially shifted and stacked, and if necessary, the direction of the fibers is changed to the orthogonal direction during the transfer process. An automatic assembly operation is continuously performed. Then, when the laminated veneer 2 is moved in parallel from the transfer origin X to the deviation from the conveyance reference line Y-Y while correcting the left and right entrance and exit, the X to each scarf overlapping location 3,
The amount of movement of the Y-axis is detected by an encoder attached to the operating mechanism such as the servo motor, stored in advance in the computer 13, and compared with a corrected set value to determine the amount of movement of the operating mechanism. By automatically controlling the amount of movement, it is possible to accurately align the scarf overlapping location 3 back and forth while correcting the left and right entrances and exits each time.

(g) Effects of the invention As mentioned above, the present invention is based on ``processing both ends into contrasting scarves, and cutting both ends of the ends into a scarf with a double saw or the like at a distance (l-S) equal to the scarf slope S subtracted from the overall length l. The veneer to be laminated, which has been cut and coated with adhesive on both or one side, is determined by a fixed or movable stopper installed at one or several locations on the ring conveyor to determine the transfer origin X in the construction direction of the veneer. Then, after detecting the deviation from the conveyance reference line Y-Y in the direction orthogonal to the assembly direction, the veneer is transferred to one or several assembly locations formed on the side assembly conveyor by a transfer robot as described above. The scarf is moved in parallel while correcting the deviation from the transport reference line Y-Y, and the scarf overlapping portions of each layer are shifted by a predetermined interval and overlapped, and when the laminated veneer becomes the cross band 15, its fibers are This is because the conventional technology is configured to transfer the veneer by changing its direction to an orthogonal direction, so that the veneer to be laminated, which is stopped in stages by a large number of fixed stoppers, is dropped directly below while the veneer is being transferred. A structure in which the mutual tip joints of veneers are stacked in a shape in which each layer is shifted at a predetermined interval in the construction direction,
A shape in which the veneers to be laminated are stopped in stages by a single movable stopping device and are moved directly below, while the mutual end joints of the veneers are shifted by a predetermined interval for each layer in the construction direction and stacked. We have added a new automatic cross band insertion function that was absent in all conventional veneer panels, and we have added an automatic cross band insertion function that was not present in veneers configured to be laminated to Due to the influence of inertia and friction when dropping or moving the veneer, the falling position of the tip of the veneer may deviate significantly back and forth in the conveyance direction, that is, back and forth in the assembly direction of the intermediate product, causing mutual tip joints. Not only does it cause overlaps and tunnels at the joints, but it also deviates greatly in the direction perpendicular to the construction direction, that is, to the left and right of the intermediate product, and creates stairs on the sides of the mutual end joints. The present invention has succeeded in eliminating all major quality problems, and the present invention has been able to automatically insert cross bands perpendicular to the fiber direction, which was completely impossible with the prior art. Not only did this make it possible, but by having the computer memorize the insertion position of the crossband in advance, it became possible to automatically insert it between any layers, significantly expanding the product lineup. Furthermore, in the process of the transfer operation, the initial setting value stored by the computer is corrected while detecting the deviation from the conveyance reference line Y-Y of the laminated veneer stopped at the transfer origin X in the construction direction. Using a transfer robot that moves parallel to the X and Y axes, each layer of scarves is stacked at a predetermined interval without moving in and out from the left or right, and is stacked and stacked to create a continuous intermediate product. This completely eliminates the longitudinal and lateral deviations caused by inertia and friction in relation to the moving speed of the laminated veneers, which occurred when simply dropping or moving them directly below the assembly site, eliminating overlaps, tunnels, etc. For the first time, it has become possible to efficiently produce high-quality intermediate products without 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 and 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, 2
b...Scarf, 3...Scarf overlapping area,
5... Glue spreader, 7, 8... Stopper, 9... Structure conveyor, 10... Transfer robot, 12... Line sensor, 13... Computer, 14a, 14b... Double saw, 15...
…Cross band.

Claims (1)

[Claims] 1. While transporting in the fiber direction a cross band to be attached to the laminated veneer with the fiber direction orthogonal to the laminated veneer which has been cut into a scarf with contrasting slopes on both ends, the scarf slope S is formed from the total length l of the laminated veneer. Both end faces of the cross band are cut using a double saw or the like at the distance (l-S), and both ends and end faces are cut and the veneer to be laminated and both sides of the cross band or The method involves applying adhesive to one side using a glue spreader, and stopping the tip of the laminated veneer and the cross band, which are coated with the adhesive and transported, with stoppers installed at one or several locations. determining a transfer origin for the direction; and detecting, by a line sensor, a deviation from a conveyance reference line in a direction orthogonal to the assembly direction of the laminated veneer and cross band for which the transfer origin for the assembly direction has been determined. , the transfer origin with respect to the construction direction is determined, and the laminated veneers and cross bands, whose deviation from the conveyance reference line with respect to the direction perpendicular to the construction direction is detected, are placed on a side construction conveyor. A suction or sticking device that can be moved in parallel and rotated in parallel while sending a deviation signal from the conveyance reference line detected by the line sensor to a computer and correcting the set value so that it can be transferred to several assembly locations. The veneer laminated material is characterized in that the laminated veneers are made into a staggered scarf joint by an attached transfer robot, and the fiber direction of the cross band is changed to an orthogonal direction and made into a staggered butt joint. Automatic mechanism method.