JP2015202932A - sheet tension mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sheet tension mechanism capable of applying tension by a vacuum without breaking a belt-like sheet even when the thickness of the belt-like sheet is thin.SOLUTION: A sheet tension mechanism 3 comprises: a box cylindrical duct 31 installed in a sheet conveyance path of a processing device 1 for processing a belt-like sheet S; a vacuum 32 for sucking the conveyed belt-like sheet S from the top of the duct 31 into the duct 31 so as to suspend the belt-like sheet S in a U shape, and applying tension thereto; and an inlet roller 33 and an outlet roller 34 for guiding the belt-like sheet S, which are disposed in an inlet part and an outlet part of the belt-like sheet S at the top end of the duct 31 respectively. At least portions of the inlet roller 33 and the outlet roller 34 are disposed on the inner side from a duct inner wall surface 313 so that a gap G which becomes a passage of air by the vacuum 32 is formed between the U-shaped belt-like sheet S inside the duct 31 and the duct inner wall surface 313.

Description

  The present invention relates to a sheet tension mechanism that is installed in a sheet conveyance path of a processing apparatus that processes a belt-like sheet, and that sucks the belt-like sheet being conveyed by vacuum to prevent sagging.

  Conventionally, as this type of sheet tension mechanism, there is one installed in a sheet conveyance path in a press machine that presses a belt-like sheet or a printing machine that applies a pattern (Patent Documents 1 to 3). As shown in FIG. 5, the sheet tension mechanism 503 sucks the box-shaped duct 531 and the conveyed belt-like sheet S so as to hang down in a U-shape from the duct 531 into the duct 531. And a plurality of guide rollers 533 and 534 disposed in the vicinity of the inlet side inner wall and the outlet side inner wall of the belt-like sheet S in the duct 531, respectively, by the guide rollers 533 and 534. The U-shaped belt-like sheet S in the duct 531 is prevented from coming into contact with the inner wall surface of the duct 531.

JP 2011-161617 A JP 2007-62289 A Japanese Patent Application Laid-Open No. 09-103995

  In such a sheet tension mechanism 503, normally, the airtightness in the duct 531 is enhanced in order to increase the efficiency (vacuum degree) of the vacuum 532. In this case, as shown in the enlarged view in FIG. 5, the belt-like sheet S comes into close contact with the plurality of guide rollers 534 and is substantially sealed, and the belt-like sheet S is drawn between the adjacent guide rollers 534. Sometimes. Then, especially when the thickness of the belt-like sheet S is thin (for example, 0.3 mm or less), as the belt-like sheet S is conveyed, the end in the width direction of the belt-like sheet S is folded, or the belt-like sheet S is entirely removed. There was a risk of damaging the belt-like sheet S such as wrinkles and creases or the belt-like sheet S breaking.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sheet tension mechanism that can apply vacuum tension without damaging even when the thickness of the belt-like sheet is thin. To do.

The sheet tension mechanism according to the present invention includes:
A box-type duct installed in the sheet conveyance path of the processing apparatus for processing the belt-like sheet;
A vacuum that applies tension by sucking the conveyed belt-like sheet so as to hang down in a U-shape from above the duct;
An inlet roller and an outlet roller disposed at each of an inlet portion and an outlet portion of the belt-like sheet at the upper end of the duct to guide the belt-like sheet;
The entrance roller and the exit roller are arranged at least partially inside the inner wall surface of the duct so that a gap serving as a passage for air is formed between the U-shaped belt-like sheet in the duct and the inner wall surface of the duct. Has been.

  With the above-described configuration, air flows due to vacuum in the gap formed between the belt-like sheet that hangs in a U-shape in the duct and the inner wall surface of the duct, and the belt-like sheet is guided by this air flow. Therefore, the belt-like sheet in the duct is prevented from being in close contact with the inner wall surface of the duct that exists in the space in the duct. Accordingly, problems such as the band-like sheet being rubbed and damaged by the inner wall surface of the duct, foreign matters such as dust adhering to the surface of the band-like sheet, and the band-like sheet breaking are prevented.

The entrance roller and the exit roller are preferably constituted by small-diameter rollers arranged in a large number so as to draw an arcuate track.
In this case, the belt-like sheet is guided and arranged in the duct so as to draw a large R arc at each position on the entrance roller and the exit roller. Therefore, it is possible to suppress the belt-like sheet that hangs down in a U shape in the duct from bulging back and forth so as to approach the inner wall surface of the duct. Thus, contact between the belt-like sheet and the inner wall surface of the duct is prevented. In addition, since the small-diameter rollers constituting the entrance roller and the exit roller have a small rotational inertia, even if the belt-like sheet conveyance speed is high, the belt-like shape in the duct is caused by the rotation inertia of the entrance roller and the exit roller when the sheet conveyance is stopped. Sheet feeding and feeding are unlikely to be excessive. Therefore, it is prevented that the belt-like sheet that hangs down in a U-shape in the duct moves violently up and down and comes into contact with the inner wall surface of the duct.

As for the said duct, it is desirable that the embossed shape is given to the inner wall surface which a U-shaped strip | belt-shaped sheet | seat opposes.
In this case, an air passage by a vacuum is secured between the belt-like sheet that hangs in a U shape in the duct and the inner wall surface of the duct by the embossed irregularities. Therefore, the belt-like sheet is separated from the inner wall surface of the duct by the flow of vacuum air between the belt-like sheet and the inner wall surface of the duct, and the belt-like sheet is prevented from coming into close contact with the inner wall surface of the duct.

The vacuum includes a fan that generates a suction force,
It is desirable that the fan is configured to reduce the fan rotation speed when the internal pressure of the duct becomes a certain value or less.
When the belt-like sheet that hangs down in a U-shape in the duct swells back and forth and the gap between the belt-like sheet and the inner wall surface of the duct becomes narrow, the internal pressure of the duct decreases (the negative pressure increases). For example, when the U-shaped belt-like sheet comes into contact with the inner wall surface of the duct or swells back and forth just before the contact, and the internal pressure of the duct becomes a certain value or less, the fan rotational speed of the vacuum is reduced. Thereby, the suction force by the vacuum is weakened, the swelling of the U-shaped belt-like sheet in the duct is suppressed, and the belt-like sheet is separated from the inner wall surface of the duct. Accordingly, contact between the belt-like sheet and the inner wall surface of the duct is prevented.

  As described above, according to the sheet tension mechanism according to the present invention, even if the thickness of the belt-like sheet is thin, no damage is caused in the duct, and no foreign matter adheres to the surface of the belt-like sheet. Tension can be applied. Accordingly, it is possible to provide a high-quality belt-like sheet product.

It is a side view showing composition of a punching device in which a sheet tension mechanism by an embodiment was installed. It is a top view which shows the structure of the punching apparatus in which the sheet tension mechanism by embodiment was installed. It is a schematic diagram which shows the structure (FIG. 3 (a)) of the sheet tension mechanism by embodiment, and the embossing shape (FIG.3 (b) (c)) of a duct inner wall surface. It is a schematic diagram for demonstrating vacuum fan rotation speed control in the sheet tension mechanism by embodiment. It is a schematic diagram which shows the structure of the conventional sheet tension mechanism.

Next, as an embodiment, a case will be described in which the sheet tension mechanism 3 is set in a sheet conveyance path of a punching device (processing device) 1 that press-processes the belt-like sheet S. However, the sheet tension mechanism 3 according to the present invention is not limited to the punching device 1, and may be various processing devices that process the belt-like sheet S such as laser, mounting, bonding, cutting, printing, surface treatment, and the like. It can be used to apply tension so that no slack occurs in the belt-like sheet S that is installed and conveyed in the sheet conveyance path.
The strip-shaped sheet S is made of various materials such as a metal foil such as aluminum or copper, a resin film such as PET or polycarbonate, and a composite film of metal and plastic. Specific examples of the belt-like sheet S include metal foil films used for solar battery electrodes, battery separators, and the like, resin films used for liquid crystal panels, and the like. For example, when the belt-like sheet S is a thin object having a thickness of 0.5 mm or less, the effect of the present invention is significantly exhibited.
In addition, in this specification, the conveyance direction of the strip | belt-shaped sheet S is made into the front-back direction.

  Referring to FIGS. 1 and 2, the punching device 1 intermittently feeds a belt-like sheet S continuously fed from a reel 21 by a winder 2 by an intermittent conveying means 5 and presses it by a press machine 4. Thus, the belt-like sheet S obtained as a product is continuously wound around the reel 71 of the rewinder 7. The sheet tension mechanism 3 of the present embodiment serves as a sag absorbing portion for the belt-like sheet S that is continuously conveyed by the winder 2 and the rewinder 7 in the punching device 1 and is intermittently conveyed to the press 4 by the intermittent conveying means 5. The first sheet tension mechanism 3A is installed in the sheet conveyance path between the winder 2 and the press machine 4, and the second sheet is disposed in the sheet conveyance path between the intermittent conveyance means 5 and the rewinder 7. A tension mechanism 3B is provided.

  The first sheet tension mechanism 3 </ b> A includes a box-shaped duct 31, a vacuum 32 that is disposed below the duct 31 and sucks down the internal air in the duct 31, and a belt-like sheet S at the upper end of the duct 31. An entrance roller 33 and an exit roller 34 are provided on each of the entrance portion and the exit portion to dispose the belt-like sheet S.

  The duct 31 has a rectangular parallelepiped shape, an opening 311 for introducing the belt-like sheet S is provided on the upper surface, and a suction port 312 for sucking air with the vacuum 32 is provided on the bottom surface. In the duct 31, a pair of guide plates 38 that can be adjusted by a handle 39 so as to be freely moved toward and away from each other according to the sheet width of the belt-like sheet S is disposed (see FIG. 2). Then, the belt-like sheet S fed out from the winder 2 is placed between the front and rear inlet rollers 33 and the outlet roller 34 so as to be disposed on the opening 311 of the duct 31, and the pair of guide plates 38 are arranged in the sheet width of the belt-like sheet S. When the vacuum 32 is driven by adjusting the movement so as to match, the belt-like sheet S is placed in a U-shaped manner in the duct 31 from the opening 311 of the duct 31. At this time, the U-shaped belt-like sheet S may swell back and forth as the vacuum 32 is sucked. In the vicinity of the lower portion of the duct 31, a plurality of laser-type sensors 37 serving as height detection means are arranged vertically, and the height (lower side) of the U-shaped lower end of the belt-like sheet S is lowered by these laser-type sensors 37. Dead point) is detected. As the height detection means, in addition to the laser sensor 37, various sensors such as an infrared sensor can be used.

  By the way, as shown in FIG. 3A, the entrance roller 33 and the exit roller 34 are located on the inner side of the duct inner wall surface 313 in the opening 311 of the duct 31 from the upper side outside the duct 31 (the center in the front-rear direction in the duct 31). A plurality of small-diameter rollers arranged so as to draw an arc orbit toward the side. As a result, the belt-like sheet S has a large R at the respective positions on the entrance roller 33 and the exit roller 34 from the upper outer side of the duct 31 to the inner side of the duct inner wall surface 313 in the opening 311 of the lower duct 31. Guided so as to draw an arc, it is arranged in the duct 31. Then, in the duct 31, the U-shaped belt-like sheet S tends to be moved toward the center in the front-rear direction in the duct 31. Therefore, the belt-like sheet S that hangs down in a U-shape in the duct 31 can be prevented from greatly expanding in the front-rear direction. Therefore, contact between the belt-like sheet S and the duct inner wall surface 313 is prevented.

  In addition, each of the entrance roller 33 and the exit roller 34 may be constituted by large-diameter rollers (33) and (34) indicated by a one-dot chain line in FIG. 3A instead of the plurality of small-diameter rollers. When the entrance roller 33 and the exit roller 34 are constituted by large diameter rollers, a part of the roller surface is arranged inside the duct inner wall surface 313, and the belt-like sheet S is formed on the duct 31 below the duct 31 from above the duct 31. The opening 311 is guided and drawn in a large R arc toward the inner side of the duct inner wall surface 313 so as to be arranged in the duct 31.

  However, if the entrance roller 33 and the exit roller 34 are composed of a plurality of small-diameter rollers, the rotation inertia is smaller than that of the large-diameter roller. In addition, due to the inertia of the rotation of the outlet roller 34, the feeding and feeding of the belt-like sheet S in the duct 31 is unlikely to be excessive. Therefore, the belt-like sheet S hanging down in the U-shape in the duct 31 is prevented from moving up and down violently, and the contact of the belt-like sheet S to the duct inner wall surface 313 is prevented.

  Since the entrance roller 33 and the exit roller 34 are disposed inside the duct inner wall surface 313 in the opening 311 of the duct 31, the entrance roller 33 and the exit roller 34 hang down in a U shape in the duct 31 as shown in FIG. A gap G serving as a passage for air by the vacuum 32 is formed between the strip-shaped sheet S and the inner wall surface 313 of the duct. The opening 311 of the duct 31 has a low sealing property by the inlet roller 33 and the outlet roller 34, and the suction of the vacuum 32 causes the gap 311 a between the inlet roller 33 and the outlet roller 34 in the opening 311 to enter the inside of the duct 31. Air is introduced into the. Therefore, an air flow from the opening 311 to the suction port 312 is formed in the gap G between the belt-like sheet S that hangs down in a U-shape in the duct 31 by the suction of the vacuum 32 and the duct inner wall surface 313 (FIG. 3 (arrow in a). Even if the belt-like sheet S that hangs down in a U-shape by this air flow swells back and forth, the belt-like sheet S is prevented from coming into contact with or in close contact with the duct inner wall surface 313. That is, the belt-like sheet S that hangs down in a U-shape is guided so that the front and rear suspending portions extend substantially straight downward as much as possible on the flow of air flowing through the gap G. Further, when the U-shaped belt-like sheet S rolls in either the front or rear direction, the air pressure in both the front and rear gaps G is adjusted so that the internal pressures in the front and rear in the duct 31 are substantially equal. Therefore, the rolled U-shaped belt-like sheet S is returned to the center side. Therefore, since the contact between the belt-like sheet S and the duct inner wall surface 313 is suppressed, the belt-like sheet S may be rubbed and damaged by the duct inner wall surface 313, or foreign matters such as dust may adhere to the surface of the belt-like sheet S. Is prevented. Further, since the plurality of guide rollers 533 and 534 as in the conventional example are not provided in the duct 31, the belt-like sheet S is not sucked and damaged between the adjacent guide rollers 533 and 534. .

  In particular, when the belt-like sheet S is thin (for example, 0.5 mm or less), the U-shaped belt-like sheet S easily flutters up and down and swells back and forth when sucked with the vacuum 3 so that a desired tension is applied. . Even in this case, the U-shaped belt-like sheet S is silenced by the air flow in the gap G, fluttering, swelling, and the like are suppressed, and contact with the duct inner wall surface 313 is also suppressed. Therefore, even a thin belt-like sheet S (for example, a thickness of 0.5 mm or less as a whole but also including a thickness of about 0.05 mm) can be appropriately tensioned without being damaged.

  In addition, since the gap G secures a swell margin before and after the U-shaped belt-like sheet S, the lower part of the U-shaped belt-like sheet S when the belt-like sheet S is suddenly introduced into the duct 31 suddenly. Since the bulge from the side is allowed, the bottom dead center (lower end height) change of the U-shaped belt-like sheet S is minimized. Therefore, the vertical fluttering of the U-shaped belt-like sheet S is suppressed, and damage such as wrinkling and breaking of the belt-like sheet S is prevented.

  If the guide rollers 533 and 534 are disposed in the gap G as in the prior art, the passage of air by the vacuum 32 can be blocked. Therefore, such guide rollers 533 and 534 may not be disposed in the gap G. Although it is preferable, as long as the air flow of the vacuum 32 is not hindered, for example, several guide rollers 533 and 534 can be disposed on the upper portion of the duct 31. Further, in order to more surely take air into the gap G, through holes may be provided in the side wall surfaces before and after the duct 31.

  Further, as shown in FIGS. 3B and 3C, the duct 31 has an embossed shape 313a in which a large number of convex portions are formed on the inner wall surface 313 of the duct before and after the belt-like sheet S hanging in a U-shape is opposed to the duct 31. It has been subjected. The air passage by the vacuum 32 is ensured between the belt-like sheet S that hangs down in the U shape in the duct 31 and the duct inner wall surface 313 by the convex portion of the embossed shape 313a. Therefore, even if the belt-like sheet S hanging down in the U-shape swells back and forth with the suction of the vacuum 32, the air flow in the gap G is reliably formed by the embossed shape 313a. It is possible to prevent the inner wall surface 313 from coming into close contact. Therefore, damages such as the belt-like sheet S being in close contact with the duct inner wall surface 313 and being damaged or broken are prevented.

  The vacuum 32 includes a fan 32a that generates a suction force. A pressure sensor 35 that detects the pressure in the duct 31 is provided in the duct 31 at a lower position. Further, the punching device 1 includes a fan control unit 36 (see FIG. 1) that reduces the rotational speed of the fan 32a when the internal pressure of the duct 31 detected by the pressure sensor 35 becomes equal to or lower than a certain pressure value. The fan control unit 36 may be provided in the sheet tension mechanism 3.

  By the way, when the belt-like sheet S hanging down in the U-shape in the duct 31 swells back and forth with the suction of the vacuum 32 and the gap G between the belt-like sheet S and the duct inner wall surface 313 is narrowed, the internal pressure of the duct 31 is reduced. Decreases (negative pressure increases). In this case, for example, when the U-shaped belt-like sheet S comes into contact with the duct inner wall surface 313 or swells back and forth to the point just before the contact, the fan control unit 36 vacuums 32 Reduce the fan speed. As a result, the suction force acting on the belt-like sheet S in the duct 31 is weakened, the swelling of the U-shaped belt-like sheet S is suppressed, and the belt-like sheet S is separated from the duct inner wall surface 313. Accordingly, contact between the belt-like sheet S and the duct inner wall surface 313 is prevented. The pressure sensor 35 may not be provided, and the internal pressure of the duct 31 may be monitored based on the current value of the fan 32a. In this case, the fan control unit 36 determines that the internal pressure of the duct 31 has decreased when the fan current value becomes equal to or greater than a certain current value, and reduces the fan rotation speed of the vacuum 32.

  The second sheet tension mechanism 3B also has the same configuration as the first sheet tension mechanism 3A. In the second sheet tension mechanism 3 </ b> B, the belt-like sheet S pressed by the press machine 4 is arranged in a U-shaped state in the duct 31 from the duct 31 by driving the vacuum 32, and is formed on the belt-like sheet S. Tension is applied to prevent sagging.

  As described above, according to the sheet tension mechanism 3 of the present embodiment, even if the belt-like sheet S is thin, it is not damaged in the duct 31 and foreign matter does not adhere to the surface of the belt-like sheet S. Tension can be applied by the vacuum 32. Accordingly, it is possible to provide a high-quality belt-like sheet product.

   Referring again to FIGS. 1 and 2, the intermittent conveying means 5 is disposed on the outlet side of the press machine 4 and intermittently feeds the belt-like sheet S to the press machine 4 and is driven by two linear motors. The sliders 51 and 52 with a clamp mechanism are arranged in the front and rear. The sliders 51 and 52 are installed on the front and rear of the two rows of rails 55 arranged along the sheet feeding direction, and clamp mechanisms 53 and 54 are provided at both ends of the sliders 51 and 52, respectively. Each of the sliders 51 and 52 is provided with an electromagnetic coil, and a permanent magnet 56 is installed between the two rows of rails 55, thereby applying an exciting current to the electromagnetic coils of the sliders 51 and 52. 51 and 52 are linear motor drives that run on the rail 55. The clamp mechanisms 53 and 54 provided on the sliders 51 and 52 include a claw portion that clamps an end portion in the width direction of the belt-like sheet S, and a drive source that operates the clamp operation and the clamp release operation. The sliders 51 and 52 are configured to clamp both ends of the belt-like sheet S in the width direction by the clamp mechanisms 53 and 54 to intermittently feed the belt-like sheet S, and one slider 51 (or 52) is the belt-like sheet. While clamping S and intermittently feeding, the other slider 52 (or 51) is configured to release the clamp of the belt-like sheet S and return to the origin position. That is, the two sliders 51 and 52 move oppositely in synchronization on the same rail 55.

  In this way, even if the belt-like sheet S is intermittently fed by clamping both ends in the width direction of the belt-like sheet S by moving the two sliders 51 and 52 with a clamp mechanism facing each other, a press machine The belt-like sheet S can be fed at a high speed following the high-speed press processing at No. 4. Since the clamp mechanisms 53 and 54 only clamp a part of both ends of the belt-like sheet S in the width direction, the contact area with the belt-like sheet S is very small, and hence foreign matter adheres to the surface of the belt-like sheet S as a product. Can be suppressed. Further, by causing the two sliders 51 and 52 with a clamp mechanism to move in opposition to each other in synchronization, vibrations generated by the movement of the sliders 51 and 52 are canceled out. There is no shaking in the direction of movement. In this embodiment, the movement from the origin position of one slider to the advance limit corresponds to a single press work in the press 4, but from the origin position of the two sliders to the advance limit. The movement may correspond to one press work in the press 4.

  The winder 2 includes a servo motor 22 that continuously rotates the reel 21 and an ultrasonic sensor 23 that serves as a winding diameter detection unit that detects the winding diameter of the reel 21. In addition to the ultrasonic sensor 23, various sensors such as a laser sensor and an infrared sensor can be used as the winding diameter detection means. Further, the punching device 1 includes a feeding control unit 8 that controls a continuous feeding speed of the belt-like sheet S from the reel 21 in the winder 2. The feeding control unit 8 controls the number of revolutions of the servo motor 22 from the winding diameter of the reel 21 detected by the ultrasonic sensor 23 in accordance with the feeding speed of the belt-like sheet S into the press 4. S is fed out continuously, and control is performed so that the fluctuation in the height of the U-shaped lower end of the belt-like sheet S detected by the laser sensor 37 in the first sheet tension mechanism 3A is kept within a minute range. For example, the feeding control unit 8 makes the continuous feeding speed of the belt-like sheet S from the winder 2 coincide with the average value of the feeding speed at which the belt-like sheet S is intermittently fed into the press 4 by the intermittent conveying means 5. The number of revolutions of the reel 21, that is, the number of revolutions of the servo motor 22 is controlled according to the winding diameter of the reel 21. Furthermore, when the height fluctuation of the U-shaped lower end of the strip-shaped sheet S detected by the laser sensor 37 in the first sheet tension mechanism 3A exceeds a minute range, the U-shaped lower end of the strip-shaped sheet S The rotational speed of the servo motor 22 is corrected so that the height fluctuation of the servo motor 22 falls within a minute range. Here, as an example, the minute range is set to a head range of 80 mm or less.

  In this way, the height variation of the U-shaped lower end of the belt-like sheet S in the duct 31 in the first sheet tension mechanism 3A is held within the minute range by the feeding control unit 8, so that high-speed press working is performed. Therefore, even if the belt-like sheet S is fed at a high speed, the U-shaped lower end of the belt-like sheet S at the first sheet tension mechanism 3A is prevented from rapidly rising. Thereby, it is possible to suppress an increase in the inertia of the movement of the belt-like sheet S when the sheet feeding is stopped. Therefore, even if the belt-like sheet S is fed at a high speed in order to perform high-speed pressing, it is possible to smoothly feed the sheet without causing an error in the sheet feeding amount. Further, the belt-like sheet S is not broken by applying a large tension to the belt-like sheet S.

  As described above, in the punching apparatus 1, even if the belt-like sheet S is fed at a high speed, the belt-like sheet S can be fed smoothly without causing a feeding error. In addition, no foreign matter is attached to the surface of the belt-like sheet S or the belt-like sheet S is not broken. Therefore, productivity can be improved significantly and a high-quality strip-shaped sheet S product can be provided.

  Note that the rewinder 7 also has the same configuration as the winder 2, and the punching device 1 has a winding for controlling the winding speed of the reel 71 in the rewinder 7 that continuously winds the belt-like sheet S. A take-out control unit 9 is provided. The take-up control unit 9 is a reel that is detected by an ultrasonic sensor 73 (similar to the above-described roll diameter detecting means 23) that is a roll diameter detecting means in accordance with the feeding speed of the belt-like sheet S into the press 4. The belt-like sheet S that has been press-processed by controlling the rotation speed of the servo motor 72 from the winding diameter of 71 is continuously taken up, and the belt-like sheet S detected by the laser sensor 37 in the second sheet tension mechanism 3B is taken up. Control is performed so that the height variation of the U-shaped lower end is maintained within a minute range. For example, in the winding control unit 9, the continuous winding speed of the belt-like sheet S in the rewinder 7 coincides with the average value of the feeding speed at which the belt-like sheet S is intermittently fed into the press 4 by the intermittent conveying means 5. As described above, the rotation speed of the reel 71, that is, the rotation speed of the servo motor 72 is controlled in accordance with the winding diameter of the reel 71. Furthermore, when the height fluctuation of the U-shaped lower end of the strip-shaped sheet S detected by the laser sensor 37 in the second sheet tension mechanism 3B exceeds a minute range, the U-shaped lower end of the strip-shaped sheet S The number of rotations of the servo motor 72 is corrected so that the fluctuation in height falls within a minute range. The minute range here is also set to a drop range of 80 mm or less as an example, as described above.

  As a result, even if the belt-like sheet S is fed at a high speed corresponding to the high-speed press working, the U-shaped lower end of the belt-like sheet S at the second sheet tension mechanism 3B is prevented from dropping rapidly, and fluttering of the belt-like sheet S is prevented. be able to. Therefore, even if the belt-like sheet S is fed at a high speed, the belt-like sheet S can be smoothly wound around the reel 71 of the rewinder 7.

The press machine 4 includes a die 41 composed of an upper die, a lower die, and a stripper, and an elevating mechanism for raising and lowering the upper die. The die 41 performs a predetermined pressing process on the belt-like sheet S.
A pair of upper and lower back tension rollers 42 driven by a servo motor is installed at the entrance of the press 4, and a belt-like sheet S is disposed between the upper and lower back tension rollers 42. The back tension roller 42 is rotated and stopped in synchronization with the intermittent feeding of the belt-like sheet S by the sliders 51 and 52 of the intermittent conveying means 5. The rotation of the back tension roller 42 also prevents the belt-like sheet S from being excessively fed by inertia when the sheet feeding is stopped.
A clamper 43 that can clamp both ends in the width direction of the belt-like sheet S is provided on the outlet side of the press 4. The clamper 43 clamps both ends of the belt-like sheet S in the width direction when the sheet feeding is stopped. This also suppresses the belt-like sheet S from being excessively fed by inertia when the sheet feeding is stopped.

  In addition, this invention is not limited only to the said embodiment, A various change is possible within the range of the summary of this invention. For example, the intermittent conveying means 5 may be arranged on the inlet side of the press machine 4.

1 Punching device (processing device)
2 Winder 3 Sheet tension mechanism 4 Press machine 5 Intermittent conveying means 7 Rewinder 31 Duct 32 Vacuum 32a Fan 33 Inlet roller 34 Outlet roller 35 Pressure sensor 36 Fan controller 311 Opening 311a Gap 312 Suction port 313 Duct inner wall surface 313a Embossed shape G Gap S Strip sheet

Claims (4)

A box-type duct installed in the sheet conveyance path of the processing apparatus for processing the belt-like sheet;
A vacuum that applies tension by sucking the conveyed belt-like sheet so as to hang down in a U-shape from above the duct;
An inlet roller and an outlet roller disposed at each of an inlet portion and an outlet portion of the belt-like sheet at the upper end of the duct to guide the belt-like sheet;
The entrance roller and the exit roller are arranged at least partially inside the inner wall surface of the duct so that a gap serving as a passage for air is formed between the U-shaped belt-like sheet in the duct and the inner wall surface of the duct. Seat tension mechanism. In the sheet tension mechanism according to claim 1,
The entrance roller and the exit roller are each a sheet tension mechanism constituted by a small number of small-diameter rollers arranged so as to draw an arcuate track. In the sheet tension mechanism according to claim 1 or 2,
The duct is a sheet tension mechanism in which an embossed shape is applied to the opposing inner wall surfaces of the U-shaped belt-like sheet. In the sheet tension mechanism according to any one of claims 1 to 3,
The vacuum includes a fan that generates a suction force,
The fan is a seat tension mechanism configured to reduce the fan rotation speed when the internal pressure of the duct becomes a predetermined value or less.

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