JP3429378B2 - Method and apparatus for joining scarf veneer veneers - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is mainly applied to a rear scarf surface of a preceding veneer veneer when a veneer veneer after being cut with scarf (hereinafter referred to as a veneer veneer) is successively joined by vertical siding. The present invention relates to a method and an apparatus for controlling a joining position of a succeeding scarf veneer with a front end scarf surface, and more specifically, a thickness of a veneer to be joined (hereinafter referred to as a veneer thickness) and a scarf cutting of the veneer to be joined. The present invention relates to a method and apparatus for controlling the conveyance of each scarf veneer so that joining can be performed at a fixed joining position even when the angle (hereinafter referred to as the scarf angle) is changed.

[0002]

2. Description of the Related Art As a method for controlling a stop position of a scarf veneer veneer when the scarf veneer veneer is joined,
For example, Japanese Patent Publication No. 62-22764 and Japanese Patent Laid-Open No. 3-1.
No. 47802 was known.

That is, Japanese Patent Publication No. 62-22764 discloses that "a belt conveyor device for feeding which is intermittently driven only in one direction, and is driven in the same direction in synchronization with the device and is temporarily driven in the opposite direction. A hot press machine consisting of a movable pressure plate and a fixed pressure plate is located between the feeding belt conveyor and a single plate rear end stopper is provided below the movable pressure plate so that it can move back and forth. In the veneer vertical splicing device characterized in that a stopper for the front end of the veneer and a roller for pushing the veneer up and down are provided in front of the fixed pressure plate. While the intermittent driving of the belt conveyor device is stopped, the feeding belt conveyor is rotated in the opposite direction for a desired time and distance (for example, 5 to 6 sec, 10 to 50 mm) to move the veneer. During octopus, the (e.g., about 10 cm) by veneer push-up roller the single plate pushed up, and by veneer rear end stoppers are moved forward,
The veneer stops its movement in contact with the stopper for the rear end of the veneer. Also, in synchronization with the above operation, the stopper for the front end of the veneer rises, and the upwardly inclined front end conveyed by the belt conveyor for feeding due to this rise hits the stopper for the front end of the veneer. The movement thereof is temporarily stopped at a position where the rear end portion is in contact with and has a downward slope. At this point, the stopper for the rear end of the veneer is retracted, the stopper for the front end of the veneer and the roller for lifting the veneer are lowered, and then the front end and the rear end of the veneer are bonded by a hot press machine. Technology is disclosed. According to the above-mentioned technique, "the joints of the bonding surfaces of the veneer whose front and rear ends are obliquely formed can be automatically arranged in order, so that the bonding does not vary and at the same time the labor cost is reduced. Reduction can be obtained. "

Further, in Japanese Patent Laid-Open No. 147802/1993, "..., the rear end portion of the preceding vertical strip veneer that has been joined and the front end portion of the trailing vertical strip veneer which is to be joined are connected to each other at the joining points. Second single-plate detector that alternately detects on the carry-in side of the press fixing plate, and the preceding vertical strip veneer by the first pinch roller and the first servomotor installed on the carry-out side of the press fixing plate. Rotary encoder for detecting the carry amount of the second pinch roller and the second servo motor installed on the carry-in side of the press fixing plate, and the first rotary encoder for detecting the carry amount of the second servo motor. And the detection signals of the second rotary encoder are compared, and the carry amount of the preceding vertical strip veneer by the first servo motor is followed by the carry amount of the subsequent vertical strip veneer by the second servo motor. Oh Vertical strip device of veneer, characterized in that comprising a fine deceleration controllably connected to the computer. ], "By equipping a series of processes with a servomotor, rotary encoder, and computer positioning mechanism capable of buffering acceleration / deceleration without forward / reverse rotation, a buffering acceleration / deceleration without radical forward / reverse transportation is provided. The technology that enables efficient vertical stripping work by transportation to be carried out safely "was disclosed.

This technical content will be specifically described as follows: "The rear end of the conveyance of the whole that is first joined to the succeeding vertical strip veneer at the joining location and carried out to the next step is the preceding vertical strip veneer. And a front end portion of the succeeding vertical strip veneer that is subsequently conveyed to and joined to a joining place, and includes a photoelectric switch or the like that is installed on the carrying-in side of a press fixing plate that is a joining place of the two. When the trailing end portion of the preceding vertical strip veneer is detected by the veneer detectors, the first pinch roller disposed on the carry-out side of the joining location and the first pinch roller.
Is formed at the rear end of the conveyance by a first servomotor such as an AC type which drives the pinch roller and a first rotary encoder such as an absolute type which detects the conveyance amount of the first pinch roller. The upward scarf slope is automatically controlled by a computer so as to be buffered at approximately the center of the press fixing plate by acceleration / deceleration control, and when the front end of the trailing vertical strip veneer is detected, it is joined. A second pinch roller arranged on the carry-in side of the place and an AC for driving the second pinch roller
A second servo motor such as a die and a second rotary encoder such as an absolute die that detects the amount of conveyance of the second pinch roller are used to press the downward facing scarf slope formed at the front end of the conveyance. The computer follows and accelerates / decelerates the mutual transfer amount so that the preceding vertical strip veneer stationary at approximately the center of the fixed platen is precisely superposed on the upward scarf slope at the rear end of the transfer. Then, they are connected so as to be superposed with each other by making them stand still as a buffer. The upward scarf slope coated with the adhesive of the preceding vertical strip veneer and the downward scarf slope not coated with the adhesive of the subsequent vertical strip veneer are:
Since they are accurately overlapped on the press fixing plate, which is the place where the two are joined, the press movable plate facing the press fixing plate is activated by the pressure cylinder, and the preceding vertical stripping unit is vertically moved. The scarf overlapping portion of the plate and the succeeding vertical stripping veneer is clamped with a desired pressing force, for example, with a pressing force of about 10 kg / square, and the press fixing plate and the press movable plate are arranged in a zigzag pattern. By applying high-frequency power of about 6 to 10 Kw for several seconds by the grid electrode, the adhesive of the scarf overlapping portion of the preceding vertical strip veneer and the subsequent vertical strip veneer is rapidly heated and cured, once. To complete the joining operation. Therefore, as in the conventional device, the sharp scarf slopes at the front and rear ends of the conveying are collided with the stopper each time to align and match the material, and the vertical strip veneer that has been once joined to the long side is mounted on the conveyor. The difficulty of breaking the joint due to the extreme inertia of the forward / reverse rotation when reversing the normal rotation and joining to a longer length was eliminated. It was that.

[0006]

The conventional scarf joining device as described above has the following problems. That is, when the scarf cut surfaces (hereinafter referred to as scarf surfaces) formed on the front end and the rear end of the scarf veneer are sequentially joined, when the respective scarf faces are conveyed to the joining position, the tip portions of the respective scarf faces are joined. Since the stop position is controlled as a reference, when the veneer thickness or scarf angle of the scarf veneer to be joined is changed, the veneer of the veneer scarf veneer will be adjusted each time so that the joining surfaces are accurately aligned. There was a problem that it had to be readjusted so that the stop position was adapted to the thickness and scarf angle.

To describe this in more detail, for example, in Japanese Patent Publication No. 22764/1987, the scarf is controlled because the sharp tip of the slope of the scarf is brought into contact with a stopper serving as a reference for the stop position. If the position of the abutting stopper is kept constant when the veneer thickness of the veneer is changed, the scarf surfaces as shown in FIGS. 1B to 1E will be joined in a displaced state. Figure 1
FIG. 1 (a) is a diagram showing a normal joining state, but FIG. 1 (b) shows a state of insufficient overlap when the scarf angle θ is constant and the veneer thickness is increased, and FIG. 1 (c) is also the same. The overlap condition which occurs when the plate thickness is reduced is shown.

On the other hand, even when the thickness of the veneer is constant, when the scarf angle is changed, the scarf surface is similarly displaced. For example, FIG. 1D shows an overlapping state when the scarf angle θ increases, and FIG. 1E shows an overlapping insufficient state when the scarf angle decreases. Therefore, as is apparent from the above, when changing the single plate thickness and the scarf angle, it was necessary to change the position of the stopper.

Further, in Japanese Patent Laid-Open No. 147802/1993, a scarf surface is detected by a detector such as a photoelectric switch. However, according to the technique disclosed herein, it is possible to detect a single plate thickness and a scarf angle. Since it is not performed, only the shape is detected, and as a result, it is a method to control based on the detection signal of the tip, and in this case as well, if the single plate thickness or scarf angle is changed, the transport distance is changed one by one. I had to do it.

Therefore, as described above, in the method of controlling the stop position with reference to the tip of the scarf surface, the veneer thickness and the scarf angle of the scarf veneer are changed so that the joining surfaces are accurately aligned. There was a common problem that the stop position had to be adjusted again to meet the above conditions.

Incidentally, as a method of adjusting the stop position again by adapting to the changing conditions of the veneer thickness and scarf angle of the scarf veneer, mainly the stopper of the front and rear end positions of the scarf veneer is used as a reference. A method of adjusting only one of them has been adopted. In other words, when the stopping position of the front end of the rear scarf surface is kept constant, only the stopper that serves as a reference for the stopping position of the front scarf surface needs to be changed. Also,
When the front end stop position is fixed, the adjustment method is the reverse of the above.

However, in the above-mentioned method, the stop position control of the joint surface of the scarf veneer is not performed with the center position of the scarf surface as a reference, but the front end portion of either the front end or the rear end scarf surface is controlled. This is a stop position control method that uses the stop position as a reference, and is so-called one-sided reference control of the stop position. Then, the scarf veneer stop position control method based on the one-sided reference described above has the following problems. In particular, it was a problem that occurred when a thermosetting adhesive was used as the adhesive.

Usually, as a method of heating and pressing the scarf surfaces coated with the thermosetting adhesive, a pair of hot plates heated by a heating fluid such as an electric heater or steam is used for the pressing. Generally, the temperature distribution of the hot plate is not uniform over the whole of the hot plate, and the center part of the hot plate has the highest temperature, and the heat tends to radiate to the outside, so the temperature tends to be low. . Therefore, when the stop position of the scarf joint surface is one side reference to the hot pressing plate as in the prior art described above, the center of the scarf surface where the heat is most difficult to transfer is the single plate thickness and the scarf. The position changes each time the corner changes. For this reason, it was easily affected by the temperature distribution of the hot plate during heating and pressing, which affected the curing action of the adhesive. Therefore, in order to make the temperature distribution of the hot plate uniform, for example, when an electric heater is used as a heat source, a plurality of electric heaters must be arranged inside the hot plate, or a wide hot plate is prepared in advance. There was a problem that I had to use. Therefore, when stopping the scarf surface, it has been desired to perform position control so that the center of the scarf surface is aligned with the center of the hot plate temperature, which is the highest.

As described above, the object of the present invention is to automatically change the veneer veneer scarf surface automatically to the veneer veneer even if the veneer thickness or scarf angle of the scarf veneers to be joined is changed. It is to convey to the optimum position in the plate pressing device and press it to obtain a stable and accurate joint surface. Moreover, the purpose is to eliminate the instability of the curing action of the thermosetting resin adhesive heating by performing stable heating and pressing on the scarf joint surface, and to obtain stable joint strength.

[0015]

Therefore, in the invention of claim 1, a veneer veneer having a thickness t cut at a scarf angle θ is fixed from the front end positions of its front end and rear end scarf surfaces at arbitrary fixed positions. After transporting for a distance, at least one of the scarf faces is coated with adhesive with an adhesive coating device, then transported to a veneer veneer pressing device provided under the adhesive coating device and stopped, and then the scarf faces are joined together. In a scarf veneer veneer joining method that presses and joins the veneer veneer veneer veneer joining method, in order to prepare for joining the trailing end scarf surface of the preceding veneer veneer to the front end scarf face of the following veneer veneer, The correction value C = t / 2 tan θ from the distance L from the tip position of the rear end scarf surface of the veneer veneer at the arbitrary fixed position to the center of the clamping position set at the center of the veneer veneer pressing device. After transporting the veneer veneer veneer plate after stopping for a distance after subtracting the veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer veneer vending plate At the time of transporting, the distance L from the tip position of the front end scarf surface of the veneer veneer at the arbitrary fixed position to the center of the veneer veneer pressing position set at the center of the veneer veneer pressing device is added with the correction value C = t / 2 tan θ. The scarf veneer veneer joining method is characterized in that the scarf veneer veneer veneer is joined by pressing the veneer veneer veneer pressing device to press and bond the scarf surfaces of the veneer veneer.

According to the second aspect of the present invention, when the veneer veneer plate is conveyed to the veneer veneer pressing device so that the scarf surface of at least one of the front end and the rear end of the veneer veneer is prepared for joining, the correction value C = t / 2 tan θ. A method of joining a scarf veneer veneer according to claim 1, characterized in that a correction value r set in advance is added or subtracted.

In a third aspect of the present invention, a veneer veneer having a thickness t cut at a scarf angle θ is conveyed at a predetermined distance from the leading end positions of the front and rear scarf surfaces, and then at least one of them is conveyed. Adhesive is applied to the scarf surface of the scarf by an adhesive applicator, then conveyed to a veneer veneer pressing device provided on the lower side of the adhesive applicator and stopped, and then the scarf is pressed and joined together. In a veneer veneer joining device, a scarf veneer veneer carrying device, an adhesive applying device that applies an adhesive to at least one of the scarf faces, and a scarf face to which the adhesive is applied is clamped The veneer veneer pressing device consisting of a pair of pressing members, and the tip position of the front end and the rear end scarf surface of the veneer veneer at an arbitrary fixed position on the adhesive applying device. A position detecting device for output, the correction value C = t / 2t from the thickness t and the value of the scarf angle θ of veneer
an anθ is calculated, and based on the calculated correction value C, a calculation device for calculating the scarf veneer veneer stop position in the veneer veneer clamping device and a scarf veneer veneer stop position calculated by the calculation device The scarf veneer veneer single plate joining device is characterized by comprising a carrying control device for controlling the carrying device.

According to the invention of claim 4, the thickness t of the veneer veneer is t.
And the value of the scarf angle θ, a correction value C = t / 2 tan θ is calculated, and the calculated correction value C and an arbitrarily set correction value r
The scarf veneer veneer veneer joining apparatus according to claim 3, wherein the scarf veneer veneer veneer stopping position in the veneer veneer veneer clamping device is calculated based on the above.

In a fifth aspect of the present invention, the position detecting device for detecting the front end positions of the front and rear scarf surfaces of the veneer veneer calculates the front end positions of the front end and the rear end scarf surface of the veneer veneer at arbitrary fixed positions. The scarf veneer veneer single plate joining device according to claim 3 and claim 4, wherein the scarf veneer veneer joining device is a position calculating device.

According to a sixth aspect of the invention, the shape of at least one of the veneer veneer pressing devices is such that the shape of the veneer veneer pressing device extends in a direction orthogonal to the direction in which the veneer veneer is conveyed in the center of the veneer veneer. The scarf veneer veneer single-plate joining device according to claim 3, claim 4, and claim 5, wherein the scarf veneer veneer joining device has a convex shape with the center of the tightening position as an apex.

[0021]

First, in the inventions of claims 1 and 3, the center of the front and rear scarf surfaces and the center of the pressing position are controlled so as to coincide with each other, and the control is stopped. Even if the thickness t and the scarf angle θ are changed,
The center of each scarf surface coincides with the center of the pressing position and stops without changing the setting of the stopping position.

In the inventions of claims 2 and 4, since the correction value r arbitrarily set in advance is added to or subtracted from the correction value C, the correction value r is set to an arbitrary value and finely adjusted. As a result, the scarf joint surface is overlapped by a desired amount and clamped.

In the fifth aspect of the invention, since the scarf cutting position is set as an arbitrary fixed position and the conveyance control to the center of the clamping position is performed instead of the end position detecting device, the tip position can be easily calculated by a computer. Is required.

According to the sixth aspect of the invention, the convex shaped portion having the apex at the pressing position center of the hot plate presses the central portion of the scarf surface regardless of the change of the single plate thickness and the scarf angle.
Fully tighten the entire scarf surface, centering on the center of the scarf surface.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. With regard to well-known components, functions, and the like, illustrations or explanations thereof will be omitted or simplified except for components necessary for explaining the present invention. FIG. 2 is a side view showing an embodiment of the present invention and a drawing showing a control device and a control circuit of the embodiment. 1 is a veneer veneer having a veneer thickness t whose front and rear ends are cut at a scarf angle θ, 3 is an end position detecting device for detecting the front end of the front and rear scarf surfaces of the veneer scarf, 5 Is an adhesive coating device, 7 is a scarf veneer loading device, 9 is a veneer veneer pressing device, and 11 is a scarf veneer unloading device. In addition, the end position detection device 3
Is denoted by L from the veneer veneer single plate pressing device 9 to the pressing position set at the center (hereinafter referred to as the center of the pressing position).

The structures of the above-mentioned devices and their functions will be described in detail below. First, the scarf veneer 1 is a veneer veneer whose front end and rear end have been cut at a scarf angle θ in advance in a direction orthogonal to the fiber direction of the veneer veneer in the pre-process of vertical perforation joining. . As a method of cutting into a scarf, a cutting by a reciprocating motion of a blade is generally used, but in addition, it may be cut by a circular saw, a disk-shaped cutter, or a disk-shaped blade. (Not shown)

The end position detecting device 3 includes an adhesive applying device 5
A detection device that uses a detection member such as a photocell provided at a fixed position (hereinafter, referred to as an arbitrary fixed position) that is properly determined by the user. The front end and the rear of the scarf veneer loaded by the scarf veneer loading device 7 Detect the tip of the end scarf surface. When the tip portion is detected, a scarf veneer detection signal 31 is output and sent to the control device 23 described later.

The scarf veneer carry-in device 7 is a member formed by a pair of upper and lower rolls provided above the end position detecting device 3 and is driven by a servo motor 8. On the other hand, the scarf veneer carry-out device 11 is a member composed of a pair of upper and lower rolls provided below the veneer veneer pressing device 9, which will be described later, and is similarly driven by the servomotor 12. In addition, the scarf veneer carry-in device 7 and the scarf veneer carry-out device 11 are
The drive can be controlled separately, or they can be driven in synchronization with each other.

The adhesive application device 5 is a device for applying an adhesive to at least one of the scarf faces, and in the present embodiment, the adhesive is applied only to the rear scarf face. The adhesive application device 5 includes an adhesive 13, a glue container 15, a glue bar 17, a glue bar elevating member 19 (not shown), a coating controller 20, and the like.

The adhesive 13 is a thermosetting resin adhesive, and in this embodiment, a melamine-urea resin adhesive (hereinafter referred to as an adhesive) is used. Besides, resin adhesives such as phenol, resorcinol, urea and melamine may be used.

The glue container 15 is a container for containing the adhesive 13, and is configured to be wider than the scarf veneer width in the direction orthogonal to the scarf veneer conveying direction. In addition, a cooling liquid 21 for lowering the temperature and increasing the storage stability of the adhesive is circulated in the glue container 15.

The gluing bar 17 is a plate-shaped member for transferring and applying the adhesive 13 to the rear end scarf surface. The gluing bar 17 is embedded in the adhesive 13 in the gluing container 15 and then pulled up to raise the gluing bar 17 The adhesive 13 is attached to itself.
Therefore, the glue bar 17 is configured to be smaller than the width of the glue container 15 in the direction orthogonal to the scarf veneer carrying direction. The gluing bar 17 is attached to a mounting base 18 (not shown; hereinafter referred to as a gluing bar mounting base) rotatably provided. The gluing bar mounting base 18 is a gluing bar elevating member provided so as to be vertically movable. It is attached to 19. The operation of applying the adhesive to the rear end scarf surface by the gluing bar 17 is controlled by the application controller 20.

Now, FIG. 3 is an explanatory view for explaining the operation of applying the adhesive to the rear end scarf surface, and (a) to (d) in the figure show the adhesion to the rear end scarf surface by the gluing bar 17. FIG. 7 is an operation explanatory view for sequentially explaining an agent applying operation.

First, FIG. 3A shows a state in which the gluing bar 17 is embedded in the gluing container 15 containing the adhesive 13. When the rear end scarf surface is carried into the adhesive application device 5, the gluing bar 17 starts to move up by the action of the gluing bar elevating member 19. At this time, although a large amount of the adhesive 13 is initially attached to the surface of the gluing bar 17, the coating amount adjusting plate 16
With this, excess adhesive is cut off and the desired amount of adhesive can be adjusted. Further, since the coating amount adjusting plate 16 is provided so as to be adjustable, the gluing bar 17 can be used if necessary.
The amount of adhesive can be changed by adjusting the gap between and.

Next, the gluing bar 17 having reached the position shown in (b) is brought into the state shown in (c) by rotating the gluing bar mount 18 upward. Then, when the rear end scarf surface is carried into the adhesive application device 5 and then stopped, the gluing bar 17 waiting at the position of (c) in the figure starts to rise, and in the state shown in (d). Contact with the rear scarf surface. Then, the adhesive 13 attached to the surface of the gluing bar 17 is transferred to the rear end scarf surface. When the coating operation on the rear scarf surface is completed in this way, this time (d)
→ (c) → (b) is followed in reverse order to return to the state of (a) to prepare for the next coating.

For reference, FIG. 4 shows an explanatory view of the operation of applying the adhesive to the front end scarf surface, which is not carried out in this embodiment. The operation from (a) to (c) in the figure is the same as the operation of applying to the rear end scarf surface in FIG.
After ascending from the position of (c) to the position of (e), the subsequent front end scarf surface is prepared for loading. Next, when the succeeding front end scarf surface is carried in, it descends to the position shown in (f), so that the adhesive 13 is transferred in contact with the front end scarf surface.

Furthermore, in the case of applying to both the front end and the rear end scarf surface, after applying to the rear end scarf surface,
After elevating to the position of (e), after the subsequent application to the front end scarf surface, it is rotated downward and then descends to the position of (a).

Next, the veneer veneer pressing device 9 includes a pair of upper and lower pressing plates and a pressing plate driving member 25 composed of a hydraulic cylinder for driving the pressing plates up and down and a pressing plate control device 26. Consists of. In the case of this embodiment, the upper pressing plate 27 (hereinafter referred to as the upper heating plate) is fixed, and only the lower pressing plate 29 (hereinafter referred to as the lower heating plate) is the pressing plate driving member 25.
Is configured so that it can be moved up and down. Further, a round rod-shaped electric heater 30 is provided substantially at the center of the upper hot plate 27 and the lower hot plate 29, and corresponds to a thermosetting resin adhesive. Incidentally, the contact surfaces of the upper heating plate 27 and the lower heating plate 29 with the single scarf plate are coated with a release agent such as Teflon resin so that the adhesive 13 does not adhere and harden.

The control device 23 is a device for controlling the entire scarf single plate joining device, and is roughly a circuit control device 33.
(Hereinafter, referred to as a computer) and a drive device 35 that drives a servo motor. Also, the computer 3
3, a correction value C = t / 2 tan θ is calculated from the veneer single plate thickness t and the scarf angle θ, and the calculated correction value C
An arithmetic unit 37 for calculating the scarf veneer stop position in the veneer veneer clamping device is included.

The operation of this embodiment will be described in detail with reference to FIG. First, when the tip of the rear end scarf portion of the scarf veneer 1 conveyed by the scarf veneer carry-out device 11 is detected by the end position detecting device 3, a scarf veneer detection signal 31 is output. Then, the scarf veneer detection signal 31 is input to the computer 33.

The arithmetic unit 37 of the control unit 23 is a unit for calculating a correction value C = t / 2 tan θ from the numerical values of the single plate thickness t and the scarf angle θ input to the computer 33.
As is apparent from FIG. 5, the correction value C is half the length of the scarf, that is, the distance from the tip of the scarf surface to the center of the scarf surface. Further, the arithmetic unit 37
Subtracts the value of the correction value C from the distance L from the end position detecting device 3 to the center of the clamping position, and calculates the conveying distance of the rear end scarf surface based on the value. Then, the control signal set based on the calculated transport distance is sent to the drive device 35.

By the way, in this embodiment, since the adhesive 13 is applied to the rear scarf surface, the conveyance of the scarf veneer must be stopped once in the adhesive applying device 5. Therefore, the above-mentioned scarf single plate detection signal 3
When 1 is transmitted, the drive device 35 determines the conveying distance based on the stop position of the rear end scarf surface input to the computer 33 from the rear end coating position setting counter 41 (not shown; hereinafter referred to as rear end coating counter). Control and stop at the coating position.

When the trailing edge coating counter 41 reaches the set value, the conveyance of the scarf veneer is temporarily stopped, a control signal is output from the computer to the coating control device 20, and the gluing bar 17 starts the coating operation. Regarding the method of applying the adhesive to the rear scarf surface, the adhesive is applied by the method already described with reference to FIG. Then, when the application of the adhesive to the rear end scarf surface is completed, the scarf veneer starts to be conveyed again.

Next, based on the value calculated by the arithmetic unit 37, the servo motor 12 of the scarf veneer carry-out unit 11
Is still controlled, the rear end scarf surface reaches the conveying distance set value calculated by the arithmetic unit, and accurately stops at the center of the clamping position. Then, it stands by in preparation for the subsequent joining with the front scarf surface.

Then, when the front end of the front scarf portion of the scarf veneer 1 conveyed by the scarf veneer carrying-in device 7 is detected by the end position detecting device 3, the scarf veneer is picked up as in the case of the rear end scarf surface. The plate detection signal 31 is transmitted. The scarf veneer detection signal 31 is input to the computer 33.

The computing device 37 calculates the transport distance of the front end scarf surface based on the value obtained by adding the correction value C to the distance L from the end position detecting device 3 to the center of the clamping position. Subsequently, the control signal set based on the calculated transport distance is sent to the drive device 35.

Since no adhesive is applied to the front end scarf surface, it is not necessary to stop the front end scarf surface in the adhesive application device 5. When the front end scarf surface needs to be coated, the front end coating position setting counter 42 (not shown; hereinafter referred to as the front end coating counter) is added to the computer 33.
Is newly provided, and the driving device 35 controls the transport distance based on the stop position of the front end scarf surface input to the front end coating counter.

By the way, at the upper position of the veneer veneer pressing device 9, there is provided a guide roll 28 which is vertically movable. This guide roll lowers the conveying path line by pushing the trailing front scarf surface downward so as not to directly contact the upper hot plate 27 of the veneer veneer pressing device 9 and the waiting rear scarf portion. In this state, it serves as a guide for loading into the pressing device. Therefore,
The front-end scarf surface that has passed through the adhesive application device 5 is carried into the veneer veneer pressing device 9 with the tip of the scarf face lowered by the action of the guide roll.

Then, when the servo motor 12 of the scarf veneer carry-out device 11 reaches the carrying distance set value calculated by the computing device, based on the control signal from the driving device 35, the front end scarf surface is accurately centered on the clamping position. Stop well.

Now, the stop positions of the front and rear scarf surfaces will be summarized based on FIGS. 6 (a) to 6 (c). First, each figure is a state diagram immediately before clamping in the veneer veneer pressing device 9, where the upper side shows the scarf veneer including the rear end scarf surface and the lower side shows the scarf veneer including the front end scarf surface. There is. Also, the dashed line in the center represents the center of the clamping position. The distance from the end position detecting device 3 to the center of the tightening position is indicated by L. Further, the scarf surface indicated by the broken line represents the position where the front end of each scarf surface is conveyed by the distance L from the position with the end position detecting device 3 as a reference.

First, since the front end of the rear scarf surface is conveyed by the distance L-correction value C from the position with the end position detecting device 3 as a reference, the distance of the correction value C is the center of the clamping position. It will be stopped in front. On the other hand, the front end of the front scarf surface is L from the position based on the end position detecting device 3.
Since the sheet is conveyed by the distance of + correction value C, the distance exceeds the center of the tightening position by the distance of the correction value C and stops.

Therefore, as is clear from the drawings, the center of each scarf surface and the center of the pressing position are made to coincide with each other to stop. This is because even if the veneer thickness t and the scarf angle θ of the scarf veneer are changed, the center of each scarf surface is made to coincide with the center of the pressing position without changing the setting of the stop position. It can be stopped.

Now, when the front end scarf surface stops at the center of the pressing position, a control signal is output from the computer to the pressing plate control device 26, and the lower hot plate 29 of the veneer veneer pressing device 9 is lifted and the respective plates are raised. Tighten the scarf faces together. Then, the adhesive on the scarf surface is cured by heating and pressing for a desired time, and the joining of the scarf surface is completed. When the lower heating plate 29 rises, the guide roll 28 also rises to release the downward pushing of the front end scarf surface and align the pass line with the rear end scarf surface.

In this way, since the center part of the scarf surface can be matched with the center part of the hot plate temperature having the highest temperature to perform compression, the center part of the scarf surface where heat is most difficult to be transferred is the most hot plate temperature. Since the pressure is applied at a high portion, the instability of the curing action of the thermosetting resin adhesive can be wiped off and stable bonding strength can be obtained.

When joining is completed, the scarf veneer carry-out device 1
Carrying out by 1 is performed. Then, it is cut into a desired fixed length by a fixed length cutting device (not shown).

Next, embodiments according to claims 2 and 4 will be described with reference to FIGS. 7 (a) to 7 (c). In the figure, (a) is a diagram showing a stopped state of the front end and rear end scarf surfaces of the veneer veneer pressing device 9 before pressing. In the case of the present embodiment, the front end portion of the rear end scarf surface is stopped at the position conveyed by the distance L-correction value C from the position with the end position detecting device 3 as a reference, but one front end scarf. The tip of the surface is L from the position based on the end position detection device 3.
+ Correction value r, which is a correction value r set in advance to a distance of + correction value C
It stops at the position where it has been conveyed by the distance added.

Therefore, the correction value r is the overlap amount (hereinafter referred to as the overlap amount) for overlapping and joining the scarf surfaces to be joined as shown in FIG.
Becomes In addition, the setting of this overlap amount is performed so that the desired overlap amount can be obtained while judging by observing the actual joining state.
The correction value r is set by inputting it by the overlap amount setting counter 43 (not shown).

From the experience, if the overlapping amount is within about 1 mm, the overlapping portion is easily plastically deformed at the time of pressing as shown in FIG. 7C, so that no step is formed in the overlapping portion. In addition, this kind of overlapping does not cause a gap (step) in the joint portion due to the difference in the veneer thickness even if the veneer thickness of the scarf veneers to be joined has some variation, so the quality is improved. A good bond was obtained.

In this embodiment, the stop position of the front end scarf surface is corrected by the correction value r to adjust the overlapping amount. On the contrary, the stop position of the front end scarf surface is corrected. Instead, the stop position of the rear end scarf surface may be corrected with the correction value r, or the stop positions of the front end and the rear end scarf surface may be corrected with the correction value r. Of course good.

Next, the embodiment according to claim 5 will be described with reference to FIG.
9 and FIG. First, the side view shown in FIG. 8 is the same as the scarf cutting device 45 shown in FIG.
And a single plate detection device 47 is added. However, Figure 2
This is omitted for the control device and the control circuit of the embodiment common to the above.

In the scarf cutting device 45, the blade 46 provided in the direction perpendicular to the fiber direction of the veneer veneer 2 reciprocates between the veneer veneer 2 and the blade receiving base 52, so that the veneer veneer 2 has a front end and a rear end. It is a device for cutting the end at a scarf angle θ. The veneer detecting device 47 is a device for detecting the front end and the rear end of the veneer veneer 2 loaded by the scarf veneer loading device 7 and outputting a veneer detection signal 48 (not shown). The output single plate detection signal 48 is input to the computer 33. Then, in the computer, a front end cutting position counter 49 (not shown) that sets a conveying distance to the front end scarf cutting position in advance and a rear end cutting position counter 50 (FIG. Since the distance to each cutting position is set by (not shown), the veneer veneer 2 is conveyed and stopped based on this setting, and then each end is cut by the scarf.

FIG. 9 is a side view showing the positional relationship between the scarf cutting position of the veneer veneer 2 and the center of the clamping position.
Now, the front end and the rear end of the scarf veneer of the veneer veneer are formed by cutting the front and rear ends of the veneer veneer 2 with the blade 46. In FIG. While the detection of the front end of the rear scarf surface is detected at the same position by the end position detection device 3 installed at an arbitrary fixed position, in the case of the present embodiment, as is clear from FIG. The front and rear scarf surface tip positions at the time are not at the same position, and the positions are relatively displaced by the scarf length s.

For example, as shown in FIG. 9 (a), when the knife 46 enters from the upper side of the veneer veneer 2 in the conveying direction to perform scarf cutting, the position of the front end of the scarf surface is at the tip of the veneer veneer 2. Although the veneer thickness and scarf angle are always constant, the tip position of the rear scarf surface is scarf length s as the veneer thickness and scarf angle change.
The position shifts to the good side by the amount. Further, as shown in FIG. 9 (b), when the knife 46 enters from the lower side of the veneer veneer 2 in the conveying direction and scarf cutting is performed, the position of one of the tips is always constant, while The position of the other tip portion is displaced by the scarf length s.

For this reason, the tip position on the side where the tip position of the scarf surface is constantly constant even when the veneer thickness and the scarf angle change is set as the reference position (hereinafter simply referred to as the reference position) of the conveyance control, and the other It was necessary to calculate the actual position of the front end of the sheet so that a difference in the scarf length s would not cause a difference in the transport distance to the center of the clamping position.

Therefore, in the case of the present embodiment, the distance L from the reference position to the center of the clamping position, the correction value C and the scarf length s.
Based on the above, the respective transport distances are calculated and the transport control is performed. Therefore, instead of the end position detecting device 3 in the above-described embodiment described with reference to FIG. 2, a position calculating device 53 (not shown) for calculating the tip position by calculation is provided.

Next, a specific calculation method will be described. As is clear from FIG. 9 (a), when the rear end scarf surface is conveyed to the center of the clamping position, the front end of the rear end scarf surface is located on the upper side in the conveying direction by the scarf length s from the reference position. Therefore, in order to convey to the center of the pressing position, the scarf length s is first added to the distance L from the reference position to the center of the pressing position, and the correction value C is subtracted for the distance. On the other hand, when the front end scarf surface is conveyed to the center of the clamping position, the tip of the front scarf surface is located at the reference position, so to convey to the center of the clamping position, from the reference position to the center of the clamping position. It suffices to carry the sheet by the distance obtained by adding the correction value C to the distance L of.

Further, in the case of FIG. 9B, when the rear end scarf surface is conveyed to the center of the pressing position, the front end of the rear end scarf surface is located at the reference position, and therefore the center of the pressing position is set. In order to carry the sheet, it is sufficient to carry the sheet by a distance obtained by subtracting the correction value C from the distance L from the reference position to the center of the clamping position. And when carrying the front scarf surface to the center of the clamping position,
The front end of the scarf surface has a scarf length s from the reference position.
Since it is located on the lower side in the conveying direction by the amount, first, the scarf length s from the distance L from the reference position to the center of the clamping position.
Should be subtracted and the correction value C should be added to carry the distance.

In this embodiment, since the scarf cutting position is set as an arbitrary fixed position and the conveyance control to the center of the clamping position is performed, a device for detecting the tip position of the scarf surface such as the end position detecting device 3 is used. In addition, since the tip position can be easily obtained by computer calculation, there is no detection error due to the end position detection device, and more accurate transfer control can be performed.

Next, the embodiment according to claim 6 is shown in FIG.
Will be explained. FIG. 10 (a) shows a standby state of the front end and rear end scarf surfaces of the veneer veneer pressing device 9 before pressing. As is clear from the figure, the upper heating plate 27
The surface contacting the scarf veneer is not a flat surface, but is formed in a convex shape having the apex at the center of the clamping position extending in the direction orthogonal to the conveying direction of the veneer veneer set in the central portion of the upper hot plate 27. . In other words, the convex portion at the apex of this hot plate is configured to coincide with the center of the pressing position.
Therefore, the convex portion that becomes the apex of this hot plate can constantly clamp the central portion of the scarf surface regardless of changes in the single plate thickness and the scarf angle.

FIG. 10B shows a state in which the respective scarf surfaces are clamped. When the lower heating plate 29 rises and clamps the scarf surface, the convex portion of the upper heating plate 27 side first comes into contact with the scarf single plate, and gradually presses toward the tip of each scarf surface. Will start to spread. Therefore, when a thermosetting resin adhesive is used as the adhesive as in the present embodiment, for example, if the thickness of each single plate to be joined is slightly different, the clamping becomes uneven and the scarf surface However, since the central portion of the upper hot plate 27 is convex, the upper hot plate is changed even if the single plate thickness or the scarf angle is changed. Since the convex portion of 27 can heat the entire scarf surface with sufficient pressure around the central portion of the scarf surface where heat cannot be easily transferred, the adhesive layer was sufficiently heated and a good adhesive state was obtained. .

When the scarf veneer having a relatively thin veneer is mainly pressed, a gentle convex shape is desirable. Further, it is desirable that the shape of the apex of the convex portion is formed by a gentle and smooth curved surface so that pressure scars do not occur due to local force applied to the scarf veneer.

In the present embodiment, the shape of the upper heating plate 27 is a convex shape having the apex at the center of the pressing position, but the lower heating plate 29 is
Even if the shape is a convex shape with the center of the clamping position as the apex,
Alternatively, both the upper and lower hot plates may be convex.

Although all of the embodiments of the present invention have been described above in the case of vertical perforated joints, the present invention can also be implemented in lateral perforated joints. Although the description has been made on the assumption that the thermosetting resin adhesive is used, a thermoplastic resin adhesive such as a hot melt adhesive can be used. In this case, the adhesive applying device 5 and the veneer veneer are used. This can be easily performed if the clamping device 9 is adapted to a thermoplastic resin adhesive.

[0074]

Since the present invention is configured as described above, it has the following effects. First, in the inventions of claims 1 and 3, the center of the front and rear scarf surfaces and the center of the pressing position are controlled so as to coincide with each other, and the control is stopped. Scarf angle θ
Even if there is a change in the position, the center of each scarf surface can be aligned with the center of the tightening position and stopped without changing the setting of the stop position. For this reason, the center of the scarf surface is aligned with the center of the hot plate for compression, and the center of the scarf surface is pressed. be able to. Therefore, particularly when a thermosetting resin adhesive is used, there is an effect that instability of the curing action of the adhesive can be eliminated and stable bonding strength can be obtained.

In the second and fourth aspects of the invention, the correction value r is added or subtracted from the correction value r set in advance. Therefore, the correction value r is set to an arbitrary value and finely adjusted. This allows the scarf joint surface to be overlapped by a desired amount and compressed, and since the overlap portion easily plastically deforms when compressed, there is some variation in the veneer thickness of the scarf veneer to be joined. However, there is an effect that a gap (step) is not generated in the joint portion due to the difference in the single plate thickness, and a high quality joint can be obtained.

In the fifth aspect of the invention, instead of the end position detecting device, the scarf cutting position is set as an arbitrary fixed position and the conveyance control to the center of the clamping position is performed. Since there is no need for a device for detecting the position of the tip of the scarf surface, and the position of the tip can be easily calculated by a computer, detection errors are eliminated and more accurate transport control can be performed.

According to the sixth aspect of the present invention, since the convex shaped portion having the apex at the pressing position center of the hot plate presses the central portion of the scarf surface regardless of changes in the single plate thickness and the scarf angle,
Even if there is a slight difference in the thickness of each veneer to be joined, the entire scarf surface can be sufficiently pressed and heated around the center of the scarf surface where heat is difficult to transfer, so the adhesive layer is sufficiently heated. This has the effect of obtaining a stable and favorable adhesive state.

[Brief description of drawings]

FIG. 1 is a partial side view illustrating a defective joining state of a scarf surface that occurs in a conventional device.

FIG. 2 is a side view of the embodiment and a drawing showing a control device and a control circuit of the embodiment.

FIG. 3 is an explanatory diagram for explaining an operation of applying an adhesive to a rear end scarf surface.

FIG. 4 is an explanatory diagram for explaining an adhesive application operation on the front end scarf surface.

FIG. 5 is a partial side view of a scarf surface for explaining a correction value C.

FIG. 6 is a partial side view for explaining stop positions of front end and rear end scarf surfaces.

FIG. 7 is a partial side view showing a scarf veneer stop position and a joining state according to a correction value r.

FIG. 8 is a side view for explaining another embodiment.

FIG. 9 is a partial side view for explaining the positional relationship between the cutting position and the center of the pressing position.

FIG. 10 is a partial side view showing a state in which a scarf surface is pressed by a pressing plate having a convex shape. .

[Explanation of symbols]

1 scarf veneer 2 veneer veneer 3 Edge position detection device 5 Adhesive coating device 7 Scarf veneer loading device 8 Servo motor 9 Veneer veneer clamping device 11 Scarf veneer carry-out device 12 Servo motor 13 Adhesive 15 glue container 16 Coating amount adjustment plate 17 glue bar 18 Gluing bar mount 19 Gluing bar lifting member 20 Coating control device 21 Coolant 23 Control device 25 Pressure plate drive member 26 Pressure plate control device 27 Upper hot plate 28 guide rolls 29 Lower hot plate 30 electric heater 31 Scarf single plate detection signal 33 computers 35 Drive 37 arithmetic unit 41 Rear end coating counter 42 Front end coating counter 43 Overlap amount setting counter 45 scarf cutting device 46 cutlery 47 Single plate detector 48 Single plate detection signal 49 Front end cutting position counter 50 Rear end cutting position counter 52 Tool rest 53 Position calculation device t Single plate thickness θ scarf angle C correction value (t / 2 tan θ) L Distance from arbitrary fixed position to center of clamping position r arbitrarily set correction value s scarf length

Claims (6)

(57) [Claims] 1. A veneer veneer having a thickness t, cut at a scarf angle θ, is conveyed at a predetermined distance from the front end positions of its front end and rear end scarf faces, respectively, and then is conveyed to at least one of the scarf faces. A scarf veneer veneer joint where adhesive is applied by the adhesive applicator, then conveyed to a veneer veneer pressing device provided at the lower part of the adhesive applicator and stopped, and then the scarf faces are pressed and joined. In the method, when the trailing scarf surface of the preceding veneer veneer is conveyed to the veneer veneer clamping device in preparation for joining with the front end scarf surface of the succeeding veneer veneer, the trailing end scarf of the veneer veneer at the arbitrary fixed position is conveyed. Distance L from the tip position of the surface to the center of the clamping position set in the center of the veneer veneer clamping device
Is conveyed for a distance obtained by subtracting the correction value C = t / 2 tan θ from the above, and then stopped, and then the front end scarf surface of the subsequent veneer veneer is ready for joining with the rear end scarf surface of the preceding veneer veneer waiting at the clamping position. Therefore, when it is conveyed to the veneer veneer pressing device, the correction value C is set to the distance L from the tip position of the front scarf surface of the veneer veneer at the arbitrary fixed position to the center of the pressing position set at the center of the veneer veneer pressing device. = T / 2ta
A method of joining veneer veneer, characterized in that the scarf veneer veneer is joined by pressing the veneer veneer pressing device with the scarf faces of the veneer veneer after stopping by conveying the product by nθ. 2. When the veneer veneer pressing device is conveyed to the veneer veneer pressing device so that at least one of the front and / or rear scarf surfaces of the veneer veneer is prepared for joining, a correction value C = t / 2 tan θ.
The method for joining a scarf veneer veneer according to claim 1, further comprising adding or subtracting a correction value r arbitrarily set in advance. 3. A veneer veneer having a thickness t cut at a scarf angle θ is conveyed at a predetermined distance from the front end positions of the front end and the rear end scarf faces at a given fixed position, and then, onto at least one of the scarf faces. A scarf veneer veneer joint where adhesive is applied by the adhesive applicator, then conveyed to a veneer veneer pressing device provided at the lower part of the adhesive applicator and stopped, and then the scarf faces are pressed and joined. In the apparatus, a conveying device for conveying a scarf veneer veneer, an adhesive applying device for applying an adhesive to at least one of the scarf surfaces, and a pair of pressing members for pressing the adhesive-coated scarf surfaces together. A veneer veneer clamping device composed of members and a position detecting device for detecting the front end positions of the front and rear scarf surfaces of the veneer veneer at an arbitrary fixed position on the adhesive applying device. If, to calculate a correction value C = t / 2tanθ from the thickness t and the value of the scarf angle θ of veneer,
An arithmetic unit for calculating a scarf veneer veneer stop position in the veneer veneer clamping device based on the calculated correction value C, and a conveyor device based on the scarf veneer veneer stop position calculated by the arithmetic unit A scarf veneer veneer joining device, which is provided with a transfer control device. 4. A veneer veneer is calculated based on a correction value C = t / 2 tan θ calculated from the thickness t of the veneer veneer and the value of the scarf angle θ, and based on the calculated correction value C and an arbitrarily set correction value r. The scarf veneer veneer joining apparatus according to claim 3, wherein the scarf veneer veneer veneer joining position is a calculation device for calculating a stop position of the veneer veneer veneer. 5. A position calculating device for detecting the front end positions of the front end and rear end scarf faces of the veneer veneer by calculating the front end positions of the front end and rear end scarf faces of the veneer veneer at arbitrary fixed positions. It is a device, The scarf veneer single board joining apparatus of Claim 3 and Claim 4 characterized by the above-mentioned. 6. The shape of at least one of the veneer veneer pressing devices is such that the shape of at least one of the veneer veneer pressing devices has an apex at the center of the vehicular veneer pressing position set in the center of the veneer veneer. The scarf veneer veneer veneer joining apparatus according to claim 3, claim 4 or claim 5, wherein the device is a convex shape.