JPH10231457A - Laminator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically detect foreign matter bitten by the clearance between the paste application member and the doctor member. SOLUTION: A doctor roll 22 is made movable in the direction of separation from a paste application roll 21. The rod 47A of an air cylinder 47 is linked to the roll 2 in an integrally displaceable manner. The cylinder 47 is provided with a piston detecting sensor 48 which detects the piston integrated with the rod 47A. When foreign matter is stuck to the roll 21 and is bitten by the clearance between the rolls 21 and 22, the roll 22 and the piston displace in the direction of separation from each other, and the displacement of the piston is detected with the sensor 48. Thus, the bite of foreign matter can be automatically detected by means of the cylinder 47 and sensor 48.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminator for attaching a backing sheet for reinforcement to a band-shaped veneer obtained by joining a plurality of thin plates.

[0002]

2. Description of the Related Art The production of veneers to be attached to woodwork furniture and fittings is performed as follows. The thin plate material obtained by slicing wood is abutted vertically and connected with tape to form a roll, which is pulled out from the reel and glued, a backing sheet is stuck on the glued surface of this veneer, and dried. At the same time, a pressing force is applied to integrate the components, and thereafter, the surface of the veneer is polished, the tape is scraped off, and the coating is applied to obtain a roll-shaped veneer.

[0003] In the above manufacturing process, the step of gluing a backing sheet to a veneer and drying it is performed in an apparatus called a laminator. The laminator is a veneer supply mechanism for supplying the veneer to the gluing position, a gluing mechanism, a backing sheet supply mechanism for supplying the backing sheet to the bonding position, and drying the bonded veneer and the backing sheet. And a drying mechanism. The gluing mechanism includes a gluing roll that applies adhesive to the surface of the veneer by supplying the adhesive to the outer periphery and rotating the outer periphery while making contact with the veneer, and an excess of the adhesive on the outer periphery of the glue roll. And a doctor roll for adjusting the amount of application to the veneer by removing the minute amount.

[0004]

In the above gluing mechanism, if the veneer has cracks or cracks or foreign matter adheres to the veneer, the debris or foreign matter due to the cracks or cracks is removed from the veneer to the outer periphery of the glue roll. May be transferred to When debris or foreign matter adheres to the outer periphery of the glue roll, the debris or foreign matter moves to a position corresponding to the doctor roll as the glue roll rotates. However,
At the corresponding position between the doctor roll and the gluing roll, only a small gap is required between the two rolls in order to minimize the amount of adhesive applied to the veneer. Leaving foreign matter in the gap between the two rolls may damage the roll surface,
Further, the veneer may be damaged. for that reason,
When a foreign object or the like is caught in the gap between the two rolls, it must be immediately detected, and a countermeasure must be taken such as reporting an abnormality or stopping the operation. Conventionally, as a method of detecting the foreign substance being caught, a method of constantly monitoring the worker by visual observation has been adopted.However, such a method not only imposes a heavy burden on the worker but also reduces the bite. You may overlook it. Therefore, there has been a demand for a means for automatically detecting the bite of a foreign substance. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a means for automatically detecting foreign matter being caught in a gap between a gluing member and a doctor member.

[0005]

According to the present invention, there is provided a laminator for adhering a band-shaped veneer formed by joining a plurality of thin plates and a backing sheet for reinforcement with an adhesive, An adhesive is supplied to the outer periphery, and a gluing member that applies an adhesive to the veneer or backing sheet by rotating and contacting the veneer or backing sheet,
A doctor member that is provided close to the outer periphery of the gluing member and that adjusts the amount of adhesive applied to the veneer or backing sheet by removing excess adhesive on the outer periphery. A guide means for guiding the doctor member in a direction in which the doctor member can be moved toward and away from the gluing member, an urging means for urging the doctor member toward the gluing member side, and the doctor member is displaced. And a detecting means for detecting the fact.

According to a second aspect of the present invention, in the first aspect of the invention, the urging means comprises an air cylinder which has a rod which can move forward and backward and which exerts an urging force by the pressure of operating air.

[0007]

Actions and effects of the present invention

<Invention of Claim 1> When a foreign substance is caught between the gluing member and the doctor member, the doctor member is displaced in a direction away from the gluing member against the urging of the urging means. The displacement is detected by the detecting means.
As described above, according to the present invention, it is possible to automatically detect the intrusion of a foreign object, so that the burden on the operator can be reduced and the oversight of the intrusion can be avoided.

<Invention of Claim 2> When the foreign material bites and the doctor member separates from the gluing member, the rod retreats with the pressure fluctuation of the working air in the air cylinder. Since the urging force is exerted by the pressure of the operating air, the setting and adjustment of the urging force can be performed easily and accurately.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

<First Embodiment> Hereinafter, a first preferred embodiment of the present invention will be described with reference to FIGS. The laminator of the present embodiment includes a veneer supply mechanism 1, a gluing mechanism 2, a backing sheet supply mechanism 3, a drying mechanism 4, a close contact mechanism 5, and a veneer winding in order from the front (the right side in FIG. 1) to the rear. Mechanism 6
The reinforcing backing sheet S is attached to the veneer V by these mechanisms. The veneer V is formed by slicing wood (not shown) and shaping both ends of a thin plate material Va into a zigzag shape and vertically abutting the same. At the abutting portion, as shown in FIG. The sheet material connecting pieces T are attached in a belt shape by sticking. In addition, since the length of the thin plate connecting piece T is larger than the width of the veneer V to allow a margin, both ends of the thin plate connecting piece T protrude from both side edges of the single plate V. The backing sheet S is adhered to the surface of the veneer V on the side opposite to the thin plate connecting piece T with an adhesive, and the bonding of the backing sheet S reinforces the connecting portion of the thin plate Va.

First, the outline of the step of attaching the backing sheet S to the veneer V will be described. Reel 1A of veneer feeding mechanism 1
The strip-shaped veneer V is wound in a roll shape, and the veneer V fed from the reel 1A is horizontally turned at a predetermined height by a turning roll 1B so that the thin plate connecting piece T is placed downward. It is sent to the gluing mechanism 2 in a state where it is turned. In the gluing mechanism 2, an adhesive is applied to the upper surface of the veneer V, and the glued veneer V is sent to the backing sheet supply mechanism 3.
In the backing sheet supply mechanism 3, the backing sheet S is
Are fed from obliquely above to the upper surface of the, and are superposed, and are adhered by an adhesive. This backing sheet S
Is passed through the drying furnace 4A of the drying mechanism 4, during which the adhesive is dried by the heater 4B in the drying furnace 4A. While passing through the gluing mechanism 2 and the drying mechanism 4, the veneer V is placed and transported on a transport conveyor 7 driven by a motor (not shown). (Not shown), and a vacuum device 7B for sucking the lower surface of the veneer V through these air holes is provided, and the vacuum operation causes the veneer V to come into close contact with the conveyor belt 7A. Is kept. The veneer V that has passed through the drying mechanism 4 is sent to the close contact mechanism 5. The adhesion mechanism 5 includes four drive rolls 5A arranged to support the veneer V from below and driven by a motor (not shown).
And one press roll 5C that presses the veneer V from above as well as three heating press rolls 5B that press the veneer V from above, and the veneer V is placed between these rolls 5A, 5B, and 5C. By passing, the adhesive is further dried and the veneer V and the backing sheet S are firmly adhered. The veneer V reinforced with the backing sheet S in this manner is taken up by a take-up reel 6A driven by a motor (not shown) in the veneer take-up mechanism 6.

<Gluing Mechanism 2> Next, the structure of the gluing mechanism 2 will be described in detail with reference to FIGS. The gluing mechanism 2 includes a gluing roll (glue member as a constituent element of the present invention) 21, a doctor roll (doctor member as a constituent element of the present invention) 22, and a backup roll 23. And a mechanism for detecting an abnormal displacement of the doctor roll 22. First, the gluing roll 21 and the doctor roll 22 will be described. A table 24 for receiving the veneer V is fixed to the front end of the base 20, and a movable roll frame 25 is provided above the table 24. As shown in FIGS. 2 and 3, the movable roll frame 25 includes a pair of upper and lower frames 25A and 25B, and a pair of right and left lower frames 25A and 25B, which are tightly fixed at rear ends (left portions in the drawings). A front frame 25C for fixing the front end portions, two upper and lower connection bars 25D for connecting the left and right lower frames 25B to each other, and an upper frame 2
It comprises a connecting bar 25E connecting the 5A to each other. The movable roll frame 25 is supported by a pair of right and left columns 26 erected on the base 20 and can tilt in a seesaw shape about a tilt axis 26A.

The base 20 has a pair of left and right air cylinders 2.
7 is supported by a shaft 28 so as to be able to swing back and forth, and its air cylinder 27A has an upward rod 27A and a lower frame 2
5B is connected via a shaft 29 to be relatively rotatable. The air cylinder 27 is operated to operate the rod 2
When 7A moves forward and backward, the movable roll frame 25 is tilted in a seesaw shape. Note that a stopper 31 is fixed to the rear support 30 erected on the base 20, and the rear end of the movable roll frame 25 abuts against the stopper 31 from above, so that the movable roll frame 25 rises forward. Tilt is regulated.

A rotating shaft 33 is supported by a bearing 32 attached to the rear end of the lower frame 25B, and the gluing roll 21 is fixed to the rotating shaft 33 so as to rotate integrally. A gluing roll 2 is provided on the outer periphery of the gluing roll 21.
The adhesive is supplied from a nozzle (not shown) provided above the first adhesive. The adhesive is applied to the veneer V by bringing the outer periphery of the veneer roll 21 into close contact with the upper surface of the veneer V while rotating.
A manual operation handle 33A is fixed to one end (lower end in FIG. 3) of the rotating shaft 33, and a driven gear 34 and a drive gear 35 are fixed to the other end. A circumferential streak-like groove (not shown) is formed on the outer periphery of the gluing roll 21 so that the adhesive can enter the groove.

An opening 25F is formed between the upper frame 25A and the lower frame 25B.
A pair of upper and lower guide portions (guide means, which is a constituent feature of the present invention) 36 is provided at the rear end portion of the guide portion 36.
, A movable bearing 37 is fitted movably in the front-rear direction. A rotary shaft 38 is supported by the movable bearing 37, and the doctor roll 22 is fixed to the rotary shaft 38 so as to rotate integrally. A driven gear 39 is fixed to the end of the rotating shaft 38 of the doctor roll 22, and the driven gear 39 is engaged with the driving gear 35 of the gluing roll 21, so that the doctor roll 22 has the same circumference as the gluing roll 21. It is driven to rotate at the speed. At both ends of the gluing roll 21 and the doctor roll 22, mounting grooves 21A and 22A are formed, and a pair of right and left regulating plates 40 are fitted into the mounting grooves 21A and 22A from above. This regulating plate 40
The adhesive supplied to the wedge-shaped recess between the gluing roll 21 and the doctor roll 22 is prevented from flowing out to the side.

The doctor roll 22 includes a guide section 3
6 is displaceable in a direction of approaching / separating from the glue roll 21 from the front. During operation of the laminator, the doctor roll 22 is held close to the outer periphery of the gluing roll 21 with a very small gap therebetween,
The doctor roll 22 removes the excess adhesive on the outer periphery of the gluing roll 21, so that the amount of the adhesive supplied to the veneer V is adjusted. The closest position of the doctor roll 22 to the gluing roll 21 is the lower frame 25B.
The movable bearing 37 is attached to the tip of the stopper bolt 41 attached to the
Is set by the contact of

Next, a mechanism for detecting an abnormal displacement of the doctor roll 22 will be described. A worm 42 and a worm wheel 43 are attached to the front frame 25C, and a male screw shaft 44 that is allowed to move only in the axial direction by a rotation preventing means (not shown) is screwed into the female screw hole 43A of the worm wheel 43. I have. When the handle 46A for manual operation fixed to one end of the worm shaft 46 is rotated, the worm wheel 43 is rotated and the male screw shaft 44 is moved in the front-rear direction.

An air cylinder (biasing means, which is a component of the present invention) 47 disposed in an opening 25F between the upper frame 25A and the lower frame 25B is fixed to the male screw shaft 44. The rod 47A of the air cylinder 47 projects rearward toward the doctor roll 22. The distal end of the rod 47A is connected to the front end of the movable bearing 37 so as to be integrally movable. This air cylinder 47 uses a rod 47A
The movable bearing 37 and the doctor roll 22 are urged toward the glue roll 21 through the nip portion. When the doctor roll 22 is displaced in the direction away from the gluing roll 21, the rod 47A is pushed in, and the piston (not shown) integral with the rod 47A is displaced forward.

On the outer surface of the air cylinder 47, a piston detection sensor (detection means which is a component of the present invention) 48 capable of magnetically detecting the position of the piston is mounted. The relative position between the piston detection sensor 48 and the piston is adjusted by moving the male screw shaft 44 back and forth. By the adjustment, the piston detection sensor 48 does not detect the piston in a state where the movable bearing 37 is in contact with the stopper bolt 41 and the doctor roll 22 is in a proper positional relationship with the gluing roll 21, but the doctor roll 22 is slightly glued. When the piston moves in the direction away from the roll 21 and the piston is displaced, the piston is detected by the piston detection sensor 48. When the piston detection sensor 48 detects the displacement of the piston, a detection signal is input to the control unit 100, and the control unit 100 outputs the motor 4 for the gluing mechanism 2.
9. A control signal for stopping a motor (not shown) for the take-up reel 6A, a motor (not shown) for the conveyor 7 and a motor (not shown) for the contact mechanism 5 is output. (See FIG. 23).

Next, the backup roll 23 will be described. A pair of left and right bearings 50 are erected on the base 20, and a support shaft 51 is inserted between the two bearings 50 so as to be rotatably supported. This support shaft 51
The front ends of a pair of left and right swing plates 52 are supported at both ends of
The pair of swing plates 52 can swing vertically independently of each other. Behind the support shaft 51 of the pair of rocking plates 52, both ends of a rotation shaft 53 are supported so as to be relatively rotatable, and the backup roll 23 is fixed to the rotation shaft 53 so as to be integrally rotatable. The backup roll 23 is located directly below the gluing roll 21 and receives the adhesive force acting on the veneer V from the gluing roll 21 from below. The adhesive on the outer periphery of the gluing roll 21 is applied to the upper surface of the veneer V sandwiched between the gluing roll 21 and the backup roll 23 in this manner.

A pair of left and right air cylinders 55 is supported on the base 20 via a shaft 54, and the tip of an upward rod 55 A of each air cylinder 55 is connected to a swing plate via a shaft 56. 52 is connected to the rear end.
The pair of air cylinders 55 operate independently of each other as described later. Therefore, for example, only the right air cylinder 55 operates to
When A advances, only the right swing plate 52 swings upward, and the backup roll 23 is lifted on the right end side to take an oblique posture. A stopper bolt 57 that can be adjusted up and down is attached to the stopper 31 for the movable roll frame 25, and the rear end of the swing plate 52 abuts against the stopper bolt 57 from below, so that the swing plate 52 Upward movement is regulated.
The upward movement restriction position by the stopper bolt 57 is set such that a gap smaller than the thickness of the veneer V is provided between the backup roll 23 and the gluing roll 21. Therefore, when the veneer V is sandwiched between the gluing roll 21 and the backup roll 23, a gap is left between the stopper bolt 57 and the swing plate 52.

A driven sprocket 58 is fixed to one end of the support shaft 51, and the driven sprocket 58
A chain 60 is stretched between and a drive sprocket 59 of a motor 49 (shown in FIG. 1) for the gluing mechanism 2. Similarly, a drive gear 61 is fixed to the support shaft 51, and the drive gear 61 is engaged with the driven gear 34 of the gluing roll 21 in a state where the backup roll 23 is at a predetermined clamping height. Further, a chain 64 is stretched between a driving sprocket 62 fixed to the support shaft 51 and a driven sprocket 63 fixed to the rotating shaft 53 of the backup roll 23. With this drive mechanism, the driving force of the motor 49 is transmitted to the backup roll 23 and the gluing roll 21 via the support shaft 51, and the backup roll 23 and the gluing roll 21 are driven to rotate at the same peripheral speed. . Further, when the rear end of the movable roll frame is displaced upward, the engagement between the driving gear 61 and the driven gear 34 is released, so that the transmission of the rotational driving force to the gluing roll 21 is interrupted.

A bracket 65 is provided between the front ends of the rocking plates 52, and a scraper 66 for scraping off the adhesive adhered to the surface of the backup roll 23 is attached to the bracket 65. A pan 67 for receiving the scraped adhesive is provided below the scraper 66. Further, at a position near the rear of the gluing roll 21 and the backup roll 23,
Table 68 for supporting glued veneer V from below
Is located at the beginning.

Next, a mechanism for correcting a lateral displacement of the veneer V when it is displaced in the width direction when passing between the gluing roll 21 and the backup roll 23 will be described. As described above, the pair of left and right air cylinders 55 that support the rear end of each rocking plate 52 operate independently of each other.
It is controlled by a lateral displacement detection sensor 69, a control unit 100, and two right and left electropneumatic proportional valves 70. Lateral displacement detection sensor 6
9 is a connecting bar 25D connecting the lower frames 25B to each other.
Is mounted so as to be adjustable in the width direction, and by detecting the position of the side edge of the veneer V, the veneer V is displaced from the normal position in the left-right direction (width direction) and the amount of displacement is determined. To detect. The detection signal is output to the control unit 100, and the control unit 100 sends a control signal to the electropneumatic proportional valve 70 based on the detection signal. The electropneumatic proportional valve 70 has a well-known structure in which the pressure on the secondary side is steplessly adjusted by a pilot electric signal. The working air adjusted to a predetermined pressure is supplied to each electropneumatic valve. The air is supplied from the proportional valves 70 to the corresponding air cylinders 55. The operation of the electropneumatic proportional valve 70 will be described with reference to FIG. 24. When the flapper 70A closes the nozzle 70B according to a control signal from the control unit 100, the pressure in the nozzle back pressure chamber 70C increases and the inner valve 70D is pushed down. , The valve port 70E is opened, and the pressure on the secondary side rises. The value of the secondary pressure is fed back as an electric signal to the control unit 100 via the pressure sensor 70F. In the control unit 100, the value of the secondary pressure set in accordance with the displacement amount of the veneer V and the above The feedback value is compared with the feedback value, and the opening operation of the valve port 70E continues until the feedback value reaches the set secondary pressure. Then, when the secondary pressure reaches the set pressure value, the nozzle 70B is opened, the pressure in the nozzle back pressure chamber 70C is reduced, and the inner valve 70D
Moves upward to close the valve port 70E. As described above, the pressure of the working air supplied to the air cylinder 55 is adjusted by the electric signal sent from the control unit 100 to each of the electropneumatic proportional valves 70 based on the detection signal of the lateral displacement detection sensor 69. According to the adjusted pressure value, the rod 5
An advance operation of 5A is performed. And this rod 55A
, The backup roll 23 is in an oblique posture, and the gap between the backup roll 23 and the gluing roll 21 is tapered.

<Backing Sheet Supply Mechanism 3> Next, the structure of the backing sheet supply mechanism 3 will be described in detail with reference to FIGS. Support body 81 erected on base 20
A reel 82 around which the backing sheet S is wound and a turning roll 83 for turning the backing sheet S unreeled from the reel 82 downward are attached to the upper end of the reel 82. The support wall 84 erected on the base 20 includes
A turning roll 85 for turning the backing sheet S from obliquely downward to downward, and a pressing roll 86 for superimposing the backing sheet S on the upper surface of the veneer V and sandwiching the same with the conveyor 7 are attached. . Also, the base 20
A receiving plate 88 is fixed to the upper ends of a pair of left and right supporting columns 87 erected on the left side, and a steering device 89 for displacing the backing sheet S in the width direction is mounted on the receiving plate 88.
Is attached. The steering device 89 includes two front and rear steering rolls 89A and 89B, and the backing sheet S turned downward from the turning roll 83 dives below the front steering roll 89A and the rear steering roll 89B. The light is turned downward on the upper surface and sent to the turning roll 85. Thus, the supply path of the backing sheet S is configured.

Next, a mechanism for causing the backing sheet S to follow the single plate V when the single plate V laterally shifts will be described. A support member 90 is fixed to one of the columns 87 (on the right side in FIGS. 12 and 13) so as to protrude in a cantilever shape to the opposite side to the transport region of the veneer V. A guide rail 91 parallel to the width direction of the veneer V is attached to the support member 90,
A movable support 92 is movably supported by the guide rail 91. An electric actuator 93 is fixed to the support member 90, and a rod 93A thereof is connected to a movable support 92. The movable actuator 92 is displaced in the width direction of the single plate V by the electric actuator 93. Has become. The electric actuator 93 has a well-known structure for moving the rod forward and backward using a motor and a ball screw, and is operated by a control signal from the control unit 100 as described later.

A bracket 94 having an inverted L-shape as viewed from the side is fixed to the movable support 92 (see FIG. 10). The bracket 94 has two support bars 95 having a rectangular cross section.
A and 95B are fixed so as to protrude toward the conveyance region of the veneer V in parallel with the width direction thereof. At the tip of one (lower side in FIGS. 10 and 12) support bar 95A,
A single plate detection sensor 96 is attached. The other (Fig. 1
A backing sheet detection sensor 97 is attached to the distal end of the support bar 95B (0 and the upper side in FIG. 12).

The single plate detection sensor 96 includes a holder 96A having a slit 96B cut out from the side edge in the width direction, and a corresponding light emitting element 96C such as an incandescent lamp sandwiching the slit 96B.
And a light receiving element 96D such as a silicon photodiode. This is a well-known photoelectric sensor called a photo head, and is supported such that the side edge of the single plate V is positioned in the slit 96B. When the position of the side edge of the veneer V is displaced in the slit 96B, the direction and distance of the displacement are detected, and this detection signal is input to the control unit 100. The control unit 100 outputs a control signal for operating the electric actuator 93 so that the veneer detection sensor 96 maintains a constant positional relationship with the veneer V in the width direction.

The single plate detecting sensor 96 includes a connecting piece detecting sensor 98 for detecting a protruding portion Ta of the thin plate connecting piece T connecting the thin plates Va of the single plate V from the single plate V.
Are mounted via a mounting plate 98A. The connection piece detection sensor 98 emits detection light downward through the circular hole 99A of the light shielding plate 99 attached to the single plate detection sensor 96. When the protruding portion Ta of the thin plate connecting piece T exists at the detection position, the protruding portion Ta reflects the irradiation light, the reflected light is received by the connecting piece detection sensor 98, and the protruding portion Ta exists at the detection position. Otherwise, no reflected light is received. That is, the presence or absence of the protrusion Ta of the thin plate connecting piece T is detected based on whether or not the reflected light is received, and this detection signal is input to the control unit 100. In the control unit 100, when the protruding portion Ta of the thin plate connecting piece T is detected, the detection result by the veneer detection sensor 96 is invalidated, and the control of the veneer detection sensor 96 is performed on the condition that the protruding portion Ta is not detected. The detection result is valid. Note that a slit-shaped opening 99B is formed in the light shielding plate 99 so as to correspond to the irradiation area of the detection light of the single plate detection sensor 96.

The backing sheet detection sensor 97 is a well-known photoelectric sensor called a photo head having a light emitting element 96C and a light receiving element 96D in a holder 97A, similarly to the single plate detection sensor 96, and a slit 96B. When the side edge of the backing sheet S is displaced, the displacement direction and the displacement distance are detected, and the detection signal is input to the control unit 100. In the control unit 100, the backing sheet S
Outputs a control signal for operating the steering device 89 so as to maintain a fixed positional relationship with the backing sheet detection sensor 97.

The steering device 89 supports a pair of left and right bearing plates 89D on a square base frame 89C fixed to a receiving plate 88 via a swing arm 89E, and has an electric actuator 89F provided with a rod 89G that can move forward and backward. And a known structure in which one swing arm 89E and a rod 89G are connected, and two front and rear steering rolls 89A and 89B are rotatably supported between both ends of both bearing plates 89D. The backing sheet S enters the front (lower in FIG. 20) steering roll 89A and is supplied along a path that turns downward along the upper surface of the rear steering roll 89B. A pulling-down force acts on the backing sheet S due to a tensile force from the drying mechanism 4 and the contact mechanism 5 side. Therefore, in FIG. 20, when the rod 89G of the electric actuator 89F advances, the left swing arm 89E is rotated clockwise, so that the two bearing plates 89D and the two steering rolls 89A and 89B also rotate in the same direction. Then tilt your posture. Then, on the rear steering roll 89B, the backing sheet S is displaced to the right in FIG. 20 by the action of the pull-down force. When the rod 89G moves backward, the backing sheet S is displaced to the left. The operation of the electric actuator 89F of the steering device 89 is controlled based on a detection signal from the backing sheet detection sensor 97 input to the control unit 100.

Next, the operation of the present embodiment will be described. <Straightening of Veneer V> The veneer V sent to the gluing mechanism 2 is coated with an adhesive while passing between the backup roll 23 and the gluing roll 21. At this time, the veneer V is sandwiched between the gluing roll 21 and the backup roll 23. By the way, since the thin plate material Va constituting the veneer V is obtained by slicing wood and performing a treatment such as heating and drying, the thickness is completely prevented from being biased in the width direction. It is difficult to do. When a portion having an uneven thickness is sandwiched in this way, the veneer V is shifted laterally to a thinner one. However, in the present embodiment, the lateral displacement of the veneer V is automatically corrected. Hereinafter, the correcting operation will be described.

When the right side of the veneer V is thin as shown in FIG. 9A, the veneer V is shifted laterally to the thinner side. The displacement direction is detected, and the displacement is also detected. The detection results are sent to the control unit 100. The control unit 100 sets the pressure value of the working air to be supplied from the right electropneumatic proportional valve 70 to the air cylinder 55 based on the detection result, and sends a control signal to the right electropneumatic proportional valve 70. . Then, the electropneumatic proportional valve 70
, The secondary pressure rises to a predetermined value, the rod 55A of the air cylinder 55 advances by a predetermined amount, and the right end of the right swing plate 52 and the backup roll 23 rises to a predetermined height. Thus, as shown in FIG. 9B, the backup roll 23 is inclined upward to the right to make the gap between the backup roll 23 and the gluing roll 21 tapered. As a result, the veneer V can be strongly sandwiched at its right end,
The veneer V is displaced to the left, so that the lateral displacement of the veneer V is corrected. When it is detected that the veneer V has been corrected and the veneer V has returned to the normal position, the electropneumatic proportional valve 70 is closed, the rod 55A is retracted, and the right end of the backup roll 23 is lowered. Further, when the lateral displacement of the veneer V is in the left direction, the electropneumatic proportional valve 70 on the left side is opened and the veneer V returns to the right by raising the left end of the backup roll 23, and the veneer V becomes When it returns to the normal position, the electropneumatic proportional valve 70
Closes.

<Detection of Abnormal Displacement of Doctor Roll 22> If the veneer V fed into the gluing mechanism 2 has nicks or cracks or foreign matter adhered thereto, the fragments or foreign matter due to the nicks or cracks are removed by the adhesive. May be transferred from the veneer V to the outer periphery of the gluing roll 21 in some cases.
The transferred foreign matter or the like moves to a position corresponding to the doctor roll 22 as the gluing roll 21 rotates. The gap between the gluing roll 21 and the doctor roll 22 is limited to a very small gap in order to minimize the amount of adhesive applied to the veneer V. Therefore, when debris or foreign matter enters the gap between the two rolls 21 and 22, a force acts on the doctor roll 22 in a direction away from the gluing roll 21. Then, the doctor roll 22
Is displaced in a direction away from the gluing roll 21 while retracting the rod 47A against the bias of the air cylinder 47, and accordingly, a piston (not shown) is also displaced integrally. This displacement of the piston is detected by the piston detection sensor 48, and a detection signal is sent to the control unit 100, and the control unit 100 outputs the motor 4 for the gluing mechanism 2.
9. A control signal for stopping the drive is output to the motor (not shown) for the take-up reel 6A, the motor (not shown) for the conveyor 7 and the motor (not shown) for the contact mechanism 5, and the laminator Operation stops.

<Following operation of backing sheet S to veneer V>
The backing sheet S is superimposed on and adhered to the veneer V to which the adhesive has been applied in the gluing mechanism 2. At this time, the veneer V and the backing sheet S are maintained in a regular positional relationship in the width direction. Has become. Hereinafter, the operation will be described. The veneer detection sensor detects the side edge position of the veneer V, a detection signal is input to the control unit 100, and the control unit 100 issues a control signal for driving the electric actuator 93 based on the detection signal. The electric actuator 93 advances and retreats the rod 93A corresponding to the position of the veneer V, and displaces the veneer detection sensor 96 in the width direction. Thereby, even if the veneer V is shifted laterally, the veneer detection sensor 96
Are constantly displaced with respect to the veneer V so as to maintain a constant positional relationship in the width direction.

On the other hand, the backing sheet detection sensor 97 detects the side edge position of the backing sheet S, and a detection signal is input to the control unit 100. The control unit 100 drives the steering device 89 based on the detection signal. And the steering device 89 displaces the backing sheet S in the width direction. Accordingly, even if the backing sheet detection sensor 97 is displaced in the width direction, the backing sheet S is displaced so as to always maintain a constant positional relationship in the width direction with respect to the backing sheet detection sensor 97.

The single-plate detection sensor 96 and the backing sheet detection sensor 97 are integrally supported. Accordingly, when the veneer V is laterally displaced, the veneer detection sensor 96 and the backing sheet detection sensor 97 are displaced by the same distance in the same direction as the veneer V following the lateral deviation. Then, following the displacement of the backing sheet detection sensor 97, the backing sheet S is displaced by the same distance in the same direction as the backing sheet detection sensor 97. Since the displacement direction and the displacement distance of the backing sheet S are the same as those of the veneer V, the backing sheet S is displaced by the same distance in the same direction as the veneer V as a result. As a result, the veneer V and the backing sheet S are always kept in a constant positional relationship in the width direction.

Further, as shown in FIG.
In the state where the protruding portion Ta is located away from the single-plate detection sensor 96, the following operation of the backing sheet S is performed as described above. On the other hand, as shown in FIG. 19, when the protruding portion Ta of the thin plate connecting piece T is detected by the veneer detection sensor 96, the protruding portion Ta of the veneer detection sensor 96 is And a detection signal indicating that the veneer V has shifted outward (upward in FIG. 19) is generated. If the electric actuator 93 is actuated by this detection signal, the veneer detection sensor is shifted outward from the normal position for the veneer V. However, in the present embodiment, such a malfunction is prevented. That is, when the protruding portion Ta of the thin plate material Va is detected by the single plate detecting sensor 96, the connecting piece detecting sensor 98 also detects the protruding portion Ta at the same time, and the detection signal of the connecting piece detecting sensor 98 is transmitted to the control unit 100. Sent to The control unit 100 invalidates the detection signal of the single plate detection sensor 96 on condition that the connection piece detection sensor 98 detects the thin plate material Va. As a result, the control signal to the electric actuator 93 is stopped, and the veneer detection sensor 93 maintains a fixed positional relationship with the veneer V.
When the protruding portion Ta of the thin plate connecting piece T is separated from the single plate detecting sensor 96 and is no longer detected, the connecting piece detecting sensor 98 also does not detect the thin plate connecting piece T. The detection signal from the plate detection sensor 96 is made valid, and a control signal is sent to the electric actuator 93 as needed. This prevents the electric actuator 93 from malfunctioning due to the detection of the protrusion Ta of the thin plate connecting piece T by the single plate detection sensor 96,
Consequently, the follow-up displacement operation of the backing sheet S is performed accurately.

As described above, in this embodiment,
Foreign matter adheres to the gluing roll 21 and the doctor roll 22
The doctor roll 22 is displaced in a direction away from the gluing roll 21 when the teeth are interposed between the doctor rolls, and the displacement of the doctor roll 22 is detected. Therefore, it is possible to prevent the foreign matter from remaining on the gluing roll 21 and prevent the glue roll 21, the backup roll 23, and the veneer V from being damaged due to the foreign matter. When the doctor roll 22 is displaced, this is detected by the piston detection sensor 48, and the motor for driving each mechanism of the laminator is automatically stopped. Does not need to be constantly monitored, and the burden on workers is reduced. In addition, it is possible to reliably prevent a bite of a foreign substance from being overlooked.

Further, since the air cylinder 47 is used as a means for urging the doctor roll 22 toward the glue roll 21, the urging force can be easily set and adjusted only by changing the pressure of the working air. Moreover, the adjustment can be performed with high accuracy. <Other Embodiments> The present invention is not limited to the embodiments described above and illustrated in the drawings. For example, the following embodiments are also included in the technical scope of the present invention. Various changes can be made without departing from the scope of the invention.

(1) In the above embodiment, the doctor member is a rotating roll member. However, the present invention is applicable to a case where the doctor member has a shape other than a roll shape such as a plate shape, or a case where the doctor member does not rotate. It can be applied in some cases. (2) In the above embodiment, the adhesive is applied to the veneer. However, the present invention can be applied to a case where the adhesive is applied to the backing sheet. (3) In the above embodiment, the air cylinder is used as the urging means. However, according to the present invention, an elastic member such as a compression coil spring can be used.

[Brief description of the drawings]

FIG. 1 is a left side view of a first embodiment of the present invention.

FIG. 2 is a partially cutaway left side view of a gluing mechanism.

FIG. 3 is a partially cutaway plan view of a gluing mechanism.

FIG. 4 is a front view of a gluing mechanism.

FIG. 5 is a partially cutaway left side view showing a support structure of a backup roll.

FIG. 6 is a plan view showing a backup roll supporting structure.

FIG. 7 is a right side view showing a driving structure of the gluing mechanism.

FIG. 8 is a partial perspective view showing a state in which a regulating plate is attached to a gluing roll and a doctor roll.

FIG. 9 is a simplified front view showing an operation for correcting lateral displacement of a veneer;

FIG. 10 is a left side view of the backing sheet supply mechanism.

FIG. 11 is a partially enlarged left side view of the backing sheet supply mechanism.

FIG. 12 is a partial front view of the backing sheet supply mechanism.

FIG. 13 is a plan view of a backing sheet supply mechanism.

FIG. 14 is a perspective view of a single-plate detection sensor.

FIG. 15 is a plan view of a single-plate detection sensor.

FIG. 16 is a front view of a single-plate detection sensor.

FIG. 17 is a perspective view showing a state in which a backing sheet is attached to a veneer;

FIG. 18 is a plan view showing a detection mode in which detection by a single-plate detection sensor is valid.

FIG. 19 is a plan view showing a detection mode in which detection by a single-plate detection sensor is invalidated.

FIG. 20 is a plan view showing a mechanism for following and displacing the backing sheet.

FIG. 21 is a block diagram showing a means for correcting lateral displacement of a veneer;

FIG. 22 is a block diagram showing a unit for detecting displacement of a doctor roll.

FIG. 23 is a block diagram showing a means for displacing the backing sheet so as to follow the lateral displacement of the veneer;

FIG. 24 is a sectional view of an electropneumatic proportional valve.

[Explanation of symbols]

 V: Single plate Va: Thin plate material S: Backing sheet 21: Glue roll (glue member) 22: Doctor roll (doctor member) 36: Guide part (guide means) 47 ... Air cylinder (biasing means) 47A: Rod 48 ... Piston detection sensor (detection means)

Claims (2)

[Claims] 1. A laminator for adhering a band-shaped veneer formed by joining a plurality of thin plate members to a reinforcing backing sheet with an adhesive, wherein the adhesive is supplied to the outer periphery, and the laminator is rotated. A glue member for applying an adhesive to the veneer or backing sheet by contacting the veneer or backing sheet; and a glue member provided in proximity to the outer periphery of the glue member to remove excess adhesive on the outer circumference. And a doctor member for adjusting the amount of adhesive applied to the veneer or backing sheet, thereby guiding the doctor member so that the doctor member can be displaced in the direction of contact and separation with respect to the gluing member. Means, urging means for urging the doctor member toward the gluing member side, and detecting means for detecting that the doctor member has been displaced. Laminator characterized by. 2. The laminator according to claim 1, wherein said urging means comprises an air cylinder having a rod which can move forward and backward and exerting an urging force by the pressure of operating air.