TWI647165B - Sheet tension mechanism - Google Patents

Abstract

An object of the present invention is to provide a sheet tension mechanism, which can apply tension generated by an air extractor without damaging even a thin sheet-like sheet. The sheet tension mechanism 3 includes a box-shaped tube 31 provided in the sheet conveyance path of the processing device 1 for processing the sheet-like sheet S, and an air extractor 32 for applying the conveyed sheet-like sheet S. It is attracted to impart tension to the U-shaped pipe 31 from the pipe 31 to the inside of the pipe 31, and the entrance roller 33 and the exit roller 34 are arranged at the entrance and exit of the strip-shaped sheet S at the upper end of the pipe 31, respectively. And can guide the strip-like sheet S. The inlet roller 33 and the outlet roller 34 are arranged at least partly closer to the inside than the inner wall surface 313 of the pipe, and form an air passage serving as the air extractor 32 between the U-shaped strip sheet S in the pipe 31 and the inner wall surface 313 of the pipe. Gap G.

Description

Sheet tension mechanism

The invention relates to a sheet tension mechanism, which is provided on a sheet conveying path of a processing device for processing a strip-shaped sheet, and sucks the conveyed strip-shaped sheet with an air extractor to make the strip-shaped sheet The material does not cause slack.

It is known that such a sheet tension mechanism is provided on a sheet conveying path such as a press or a printing press for applying a pattern to a band-shaped sheet (Patent Documents 1 to 3). As shown in FIG. 5, the sheet tension mechanism 503 includes a box-shaped tube 531, an air extractor 532, and a plurality of guide rollers 533 and 534. The air extractor 532 can attract the belt-shaped sheet S to be conveyed, so that The U-shaped pipe hangs down from the pipe 531 into the pipe 531 and applies tension to the band-shaped sheet S. The guide rollers 533 and 534 are respectively arranged near the entrance-side inner wall of the band-shaped sheet S in the pipe 531. Near the exit-side inner wall, the U-shaped band-shaped sheet S in the duct 531 does not contact the inner wall surface of the duct 531 by the guide rollers 533 and 534.

Advance technical literature Patent literature

[Patent Document 1] Japanese Patent Application Laid-Open No. 2011-161617

[Patent Document 2] Japanese Patent Laid-Open No. 2007-62289

[Patent Document 3] Japanese Patent Laid-Open No. 09-103995

In the sheet tension mechanism 503, the airtightness in the duct 531 is generally improved to improve the efficiency (vacuum degree) of the air extractor 532. At this time, as shown in the enlarged view in FIG. 5, the band-shaped sheet S is in close contact with the plurality of guide rollers 534 and is in a substantially closed state. The band-shaped sheet S may be sandwiched between adjacent guides. Roller Room 534. It is also possible to pinch the band-shaped sheet S on the guide roller 533 side. In this way, especially when the thickness of the strip-shaped sheet S is thin (for example, the thickness is 0.3 mm or less), as the strip-shaped sheet S is conveyed, the widthwise end of the strip-shaped sheet S is bent, Or, the entire band-shaped sheet S may be wrinkled to cause creases, which may cause damage to the band-shaped sheet S, and the band-shaped sheet S may be damaged.

In view of this, an object of the present invention is to provide a sheet tension mechanism, which can impart tension generated by an air extractor without causing damage even if the thickness of the strip-shaped sheet is thin.

The sheet tension mechanism of the present invention includes a box-and-tube-type pipe provided in a sheet conveying path of a processing device for processing the strip-shaped sheet; an air extractor to attract the conveyed strip-shaped sheet To give tension to the U-shaped drop from the pipe into the pipe; and the entrance roller and the exit roller are respectively arranged at the entrance and exit of the strip-shaped sheet at the upper end of the pipeline, and can guide the strip-shaped sheet The inlet roller and the outlet roller are arranged at least partly closer to the inside than the inner wall surface of the pipe, so as to form a gap between the U-shaped band-shaped sheet material in the pipe and the inner wall surface of the pipe as an air passage of the air extractor.

With the above configuration, the gap formed between the band-shaped sheet that hangs in a U shape into the pipe and the inner wall surface of the pipe generates an air flow caused by the air extractor, and the belt shape is guided by the air flow. Sheet. Therefore, it is possible to prevent the strip-shaped sheet material in the pipe from coming into contact with the inner wall surface of the pipe and being in close contact with it. Therefore, it is possible to prevent problems such as the band-shaped sheet rubbing against the inner wall surface of the pipe, causing damage, or adhesion of foreign matter such as dirt on the surface of the band-shaped sheet, or damage to the band-shaped sheet.

The inlet roller and the outlet roller are preferably composed of small-diameter rollers, and the small-diameter rollers are arranged in a large number and draw an arc track.

At this time, the strip-shaped sheet is guided and arranged in the pipe, and a large R arc is drawn on the inlet roller and the outlet roller respectively. Therefore, it is possible to avoid the U-shaped band-shaped sheet hanging down in the pipe from spreading forward and backward and approaching the inner wall surface of the pipe. Therefore, contact between the strip-shaped sheet and the inner wall surface of the pipe can be prevented. In addition, the small-diameter rollers constituting the inlet roller and the outlet roller have a small inertia of rotation, so even if the conveyance speed of the strip-shaped sheet is high, when the sheet conveyance is stopped, the strip-shaped sheet in the pipe is not easily caused by the inlet roller And the inertia of the exit roller is excessively fed in or out. Therefore, it is possible to prevent the belt-shaped sheet hanging in a U shape in the pipe from swinging up and down and coming into contact with the inner wall surface of the pipe.

It is preferable that the above-mentioned pipe is formed with an embossed shape on the inner wall surface facing the U-shaped belt-shaped sheet.

At this time, through the unevenness of the embossed shape, the air passage of the air extractor can be ensured between the U-shaped strip-shaped sheet and the inner wall surface of the pipe. Therefore, the airflow caused between the band-shaped sheet and the inner wall surface of the pipe by the air extractor can make the band-shaped sheet leave the inner wall surface of the pipe and prevent the band-shaped sheet from closely contacting the inner wall surface of the pipe.

The above-mentioned air extractor has a fan capable of generating attractive force, and the above-mentioned fan is preferably configured to reduce the number of fan revolutions when the internal pressure of the pipe is below a certain value.

When the U-shaped hanging sheet in the pipe expands forward and backward, the tape sheet and the pipe When the gap between the walls becomes narrow, the internal pressure of the pipe decreases (the degree of negative pressure becomes larger). In addition, for example, when the U-shaped band-shaped sheet expands forward and backward and comes into contact with the inner wall surface of the pipe, or immediately before the contact, and the internal pressure of the pipe is lower than a certain value, the fan revolution of the air extractor is reduced. Thereby, the attractive force of the air extractor can be weakened, and the U-shaped band-shaped sheet in the pipe can be restrained from expanding, and the band-shaped sheet can be separated from the inner wall surface of the pipe. Therefore, contact between the strip-shaped sheet and the inner wall surface of the pipe can be prevented.

As described above, according to the sheet tensioning mechanism of the present invention, even if the thickness of the strip-shaped sheet is thin, it can be pulled out without being damaged in the pipe and the surface of the strip-shaped sheet will not adhere to foreign matter. The air machine gives tension. Therefore, a high-quality strip-shaped sheet product can be provided.

1‧‧‧ Punching device (processing device)

2‧‧‧ Winder

21‧‧‧ Reel

22‧‧‧Servo Motor

23‧‧‧ Ultrasonic Sensor

3 (3A, 3B) ‧‧‧Sheet tension mechanism

31‧‧‧pipe

311‧‧‧ opening

311a‧‧‧space

312‧‧‧Suction port

313‧‧‧Inner wall surface of pipeline

313a‧‧‧embossed shape

32‧‧‧ Extractor

32a‧‧‧fan

33‧‧‧Entry roller

34‧‧‧ exit roller

35‧‧‧Pressure sensor

36‧‧‧Fan control section

37‧‧‧laser sensor

38‧‧‧Guide

39‧‧‧handle

4‧‧‧Presser

41‧‧‧Mould

42‧‧‧Back tension roller

43‧‧‧ Clamp

5‧‧‧ intermittent transfer agency

51, 52‧‧‧ Slider

53, 54‧‧‧ clamping mechanism

55‧‧‧ track

56‧‧‧ Permanent magnet

7‧‧‧ Rewinder

71‧‧‧ Reel

72‧‧‧Servo motor

73‧‧‧ Ultrasonic Sensor

S‧‧‧ Ribbon Sheet

G‧‧‧ Clearance

FIG. 1 is a side view showing the structure of a punching device provided with a sheet tension mechanism according to an embodiment.

Fig. 2 is a top view showing the structure of a punching device provided with a sheet tension mechanism according to the embodiment.

Fig. 3 is a schematic diagram showing the configuration of the sheet tension mechanism (Fig. 3 (a)) and the embossed shape of the inner wall surface of the pipe according to the embodiment (Fig. 3 (b) (c)).

FIG. 4 is a schematic diagram for explaining the control of the number of revolutions of the fan of the air extractor in the sheet tension mechanism of the embodiment.

Fig. 5 is a schematic diagram showing the structure of a conventional sheet tension mechanism.

Next, the embodiment is described with the case where the sheet tension mechanism 3 is set on the sheet conveying path of the punching device (processing device) 1 for press-processing the strip-shaped sheet S. However, the sheet tension mechanism 3 of the present invention is not limited to the punching device 1 and may be provided in, for example, laser, mounting, bonding, The sheet conveyance path of various processing apparatuses that perform processing on the strip-shaped sheet S such as cutting, printing, and surface treatment is used to apply tension to prevent the conveyed strip-shaped sheet S from slackening.

Various materials such as metal foil such as aluminum or copper, resin film such as PET or polycarbon fiber, and composite film of metal and plastic can be used for the band-shaped sheet S. Specific examples of the band-shaped sheet S include, for example, a metal foil film used for an electrode of a solar cell or a battery separator, a resin film used for a liquid crystal panel, and the like. For example, when the strip-shaped sheet S is a sheet having a thickness of 0.5 mm or less, the effect of the present invention can be exerted meaningfully.

In this specification, the transport direction of the strip-shaped sheet S is used as the front-rear direction.

Referring to FIG. 1 and FIG. 2, the punching device 1 uses an intermittent conveyance mechanism 5 to intermittently convey a strip-shaped sheet S continuously pulled out from a reel 21 by a winder 2 and pressurized by a press 4 An apparatus for processing and continuously winding a strip-shaped sheet S that has been turned into a product by the pressure processing, on a reel 71 of a winder 7. The sheet tension mechanism 3 according to the embodiment is a strip-shaped sheet S that is continuously conveyed by the winder 2 and the rewinder 7 in the punching device 1 and intermittently by the intermittent conveyance mechanism 5 to the press 4. The first sheet tension mechanism 3A is provided in the sheet conveying path between the winder 2 and the press 4 and the sheet conveying path between the intermittent conveying mechanism 5 and the rewinder 7 is provided in the slack absorbing section. The second sheet tension mechanism 3B.

The first sheet tensioning mechanism 3A includes a box-shaped tube 31, an air extractor 32, an inlet roller 33, and an outlet roller 34. The air extractor 32 is disposed below the tube 31 and can suck the internal air in the tube 31 downward. The entrance roller 33 and the exit roller 34 are respectively arranged at the entrance and exit of the strip-shaped sheet S at the upper end of the pipe 31, and the strip-shaped sheet S can be arranged.

The duct 31 has a rectangular parallelepiped shape, an opening portion 311 for introducing the band-shaped sheet S is provided on the upper surface, and an inlet 312 is provided on the bottom surface for the air extractor 32 to attract air. Again, the pipe 31 A pair of guide plates 38 (refer to FIG. 2) are provided therein, and the guide plates 38 can be freely adjusted to approach or separate by the handle 39 according to the sheet width of the strip-shaped sheet S. In addition, the strip-shaped sheet S drawn from the winder 2 is disposed between the front and rear inlet rollers 33 and the outlet rollers 34 and is disposed on the opening portion 311 of the duct 31. When the pair of guide plates 38 are moved and adjusted, After the width of the strip-shaped sheet S is adjusted and the air extractor 32 is driven, the strip-shaped sheet S can be arranged in a state of hanging down from the opening portion 311 of the duct 31 into the duct 31. At this time, the U-shaped band-shaped sheet S may expand slightly forward and backward in accordance with the suction of the air extractor 32. In the vicinity of the lower part of the pipe 31, a plurality of laser sensors 37 serving as a height detection mechanism are arranged up and down. With these laser sensors 37, the U-shaped lower end of the strip sheet S can be detected. Height (bottom dead center). The height detection mechanism can use various sensors other than the laser sensor 37, such as an infrared sensor.

As shown in FIG. 3 (a), the inlet roller 33 and the outlet roller 34 are composed of a plurality of small-diameter rollers. The small-diameter rollers are the openings 311 of the pipe 31 from the upper side of the pipe 31 toward the lower side. A circular arc track is drawn closer to the inside than the inner wall surface 313 of the pipe (the central side in the front-back direction in the pipe 31). Among the plurality of small-diameter rollers, a part is arranged closer to the inside than the inner wall surface 313 of the pipe. As a result, the strip-shaped sheet S is guided to be arranged in the pipe 31 at each position on the entrance roller 33 and the exit roller 34, and the opening portion 311 of the pipe 31 is directed from the upper side to the lower side of the pipe 31, A large R arc is drawn near the inner wall surface 313 of the pipe. In this way, in the duct 31, the U-shaped band-shaped sheet S tends to be concentrated toward the center side in the forward and backward direction in the duct 31. Therefore, it is possible to prevent the band-shaped sheet S hanging down in a U shape in the duct 31 from being greatly expanded forward and backward. Therefore, it is possible to prevent the band-shaped sheet S from coming into contact with the inner wall surface 313 of the duct.

In addition, the entrance roller 33 and the exit roller 34 may be constituted by the large-diameter rollers (33) and (34) shown by dashed lines in FIG. 3 (a), respectively, instead of the plural small-diameter rollers. Constructed with large-diameter rollers The mouth roller 33 and the exit roller 34 are arranged such that a part of the roller surface is closer to the inside than the pipe inner wall surface 313 to guide and arrange the strip-shaped sheet S in the pipe 31 so that it can be directed downward from above the outside of the pipe 31 An opening 311 of the pipe 31 draws a large R arc near the inside of the pipe inner wall surface 313.

However, if the entrance roller 33 and the exit roller 34 are formed by a plurality of small-diameter rollers, compared with the large-diameter rollers, the rotation inertia is smaller, so even if the strip-shaped sheet S is conveyed at a faster speed, when the intermittent conveyance stops, the pipe The belt-shaped sheet S in 31 is not easily fed in or out due to the rotational inertia of the entrance roller 33 and the exit roller 34. Therefore, the U-shaped band-shaped sheet S hanging down in the duct 31 can be suppressed from swinging up and down violently, and the band-shaped sheet S can be prevented from coming into contact with the inner wall surface 313 of the duct.

The entrance roller 33 and the exit roller 34 are arranged closer to the inside than the inner wall surface 313 of the pipe at the opening portion 311 of the pipe 31. Therefore, as shown in FIG. 3 (a), a U-shaped band-shaped sheet hangs down in the pipe 31 A gap G may be formed between S and the inner wall surface 313 of the duct as an air passage of the air extractor 32. In addition, in the opening portion 311 of the duct 31, the airtightness of the inlet roller 33 and the outlet roller 34 is reduced, and the air can be drawn from the space 311a of the inlet roller 33 and the outlet roller 34 of the opening portion 311 by the suction of the air extractor 32. Into the pipe 31. Therefore, the gap G between the band-shaped sheet S hanging in a U shape in the duct 31 and the inner wall surface 313 of the duct by the suction of the air extractor 32 will form an air flow from the opening 311 to the suction port 312 (FIG. 3 (a) arrow). By this airflow, even if the U-shaped downwardly extending strip-shaped sheet S expands forward and backward, it is possible to prevent the strip-shaped sheet S from contacting or closely contacting the inner wall surface 313 of the pipe. In other words, the U-shaped band-shaped sheet S is guided so that the front and rear hanging portions extend substantially straight downward along the airflow flowing through the gap G. In addition, when the U-shaped band-shaped sheet S rolls in either direction, the pressure can be adjusted by the air flow in the gap G between the front and back, so that the internal pressure in the duct 31 is approximately the same. The swinging U-shaped band-shaped sheet S returns to the center side. Therefore, the contact between the band-shaped sheet S and the inner wall surface 313 of the pipe can be avoided, and thus the band-shaped sheet S can be prevented from rubbing against the inner wall surface 313 of the pipe to cause damage, or foreign matter such as dirt on the surface of the band-shaped sheet S. In addition, since the plurality of guide rollers 533 and 534 of the conventional example shown in FIG. 5 are not provided in the duct 31, the strip-shaped sheet S is not sucked between the guide rollers 533 adjacent to the entrance side and between Damage occurs between the guide rollers 534 adjacent to the exit side.

In particular, when the thickness of the band-shaped sheet S is thin (for example, the thickness is 0.5 mm or less), the U-shaped band-shaped sheet S may easily swing up and down or expand back and forth if the desired tension is applied by suction by the air extractor 3. Even so, the airflow in the gap G can still stabilize the U-shaped band-shaped sheet S, avoid shaking or expansion, and avoid contact with the inner wall surface 313 of the pipe. Therefore, even if it is a thin strip-shaped sheet S (for example, the total thickness is 0.5 mm or less, including about 0.05 mm in thickness), tension can be appropriately applied without damaging it.

In addition, since the U-shaped band-shaped sheet S cannot be expanded forward and backward by the gap G, when a large number of band-shaped sheets S are suddenly introduced into the pipe 31, the U-shaped band-shaped sheet S can be allowed to Since the lower side is expanded, the change in the bottom dead center (lower end height) of the U-shaped band-shaped sheet S can be minimized. Therefore, it is possible to suppress the U-shaped band-shaped sheet S from sloshing up and down, and to prevent the band-shaped sheet S from being wrinkled or damaged.

However, if the gap G is provided with guide rollers 533 and 534 as in the conventional example shown in FIG. 5, the air passage of the air extractor 32 may be blocked. Therefore, the gap G is not provided with the above guide rollers 533 and 534 as It is good, but as long as it does not obstruct the air flow of the air extractor 32, for example, a plurality of guide rollers 533 and 534 may be arranged near the inner wall before and after the upper part of the pipe 31. In order to make the air flow into the gap G more reliable, a through hole may be provided on the front and rear side wall surfaces of the duct 31.

Moreover, as shown in FIG. 3 (b) (c), a convex shape 313a is provided in the pipe 315, The embossed shape 313 a has a plurality of convex portions formed on the inner wall surface 313 of the front and rear ducts facing the belt-shaped sheet S hanging in a U shape. By the convex portion of the embossed shape 313a, the U-shaped strip-shaped sheet S in the pipe 31 and the inner wall surface 313 of the pipe can ensure the air passage of the air extractor 32. Therefore, even if the band-shaped sheet S hanging down in a U-shape expands forward and backward with the suction of the air extractor 32, since the airflow of the gap G can be reliably formed by the embossed shape 313a, the band-shaped sheet can be prevented The material S is in close contact with the inner wall surface 313 of the pipe. Therefore, it is possible to prevent the band-shaped sheet S from coming into close contact with the inner wall surface 313 of the pipe and causing damage or breakage.

The air extractor 32 has an attractive fan 32a. A pressure sensor 35 capable of detecting the pressure in the pipe 31 is provided in the pipe 31 at a lower position. In addition, the punching device 1 includes a fan control unit 36 (refer to FIG. 1), and when the internal pressure of the duct 31 detected by the pressure sensor 35 is lower than a certain pressure value, the number of revolutions of the fan 32 a is reduced. The fan control unit 36 may be provided in the sheet tension mechanism 3.

However, when the U-shaped band-shaped sheet S hanging in the duct 31 expands forward and backward with the suction of the air extractor 32, the gap G between the band-shaped sheet S and the inner wall surface 313 of the duct is narrowed. The internal pressure of the pipe 31 decreases (the degree of negative pressure becomes larger). At this time, for example, before the U-shaped band-shaped sheet S expands forward and backward and comes into contact with the inner wall surface 313 of the pipe or is about to come into contact, for example, when the detected pressure value of the pressure sensor 35 is lower than a certain When the pressure is less than the value, the fan revolution of the air extractor 32 is reduced. Thereby, the attractive force of the band-shaped sheet S acting in the duct 31 is weakened, and the expansion of the U-shaped band-shaped sheet S can be suppressed, and the band-shaped sheet S can be separated from the inner wall surface 313 of the duct. Therefore, the band-shaped sheet S can be prevented from coming into contact with the inner wall surface 313 of the duct. In addition, instead of providing the pressure sensor 35, the internal pressure of the duct 31 may be monitored based on the current value of the fan 32a. At this time, when the fan current value exceeds a certain current value, the fan control unit 36 judges that the internal pressure of the pipe 31 has been reduced, and makes the fan revolution of the air extractor 32 reduce.

The second sheet tension mechanism 3B also has the same configuration as the first sheet tension mechanism 3A. In this second sheet tension mechanism 3B, the belt-shaped sheet S pressurized by the press 4 can be driven by the air extractor 32 to be arranged in a U shape from the pipe 31 to the inside of the pipe 31. In this state, tension is applied so that the band-shaped sheet S is not loosened.

As described above, according to the sheet tension mechanism 3 of the embodiment, even if the thickness of the strip-shaped sheet S is thin (for example, 0.5 mm or less in thickness), it can be prevented from being damaged in the pipe 31 and the surface of the strip-shaped sheet S will not be damaged. When foreign matter is attached, tension is applied by the air extractor 32. Therefore, a high-quality strip-shaped sheet product can be provided.

Referring again to FIG. 1 and FIG. 2, the intermittent conveying mechanism 5 is disposed on the exit side of the press 4 to intermittently feed the sheet-like sheet S to the press 4, and two linear motor drives are arranged in front and back. The sliders 51 and 52 are provided with a clamping mechanism. The sliders 51 and 52 are provided on the front and rear on two rows of rails 55 arranged along the sheet conveying direction, and clamping mechanisms 53 and 54 are respectively provided at both ends of the sliders 51 and 52. Each slider 51, 5 is provided with an electromagnetic coil, and a permanent magnet 56 is provided between the two rows of rails 55, thereby forming a linear motor drive, and an excitation current can be applied to the electromagnetic coils of the sliders 51, 52 to make the slider 51, 52 goes on track 55. The gripping mechanisms 53 and 54 provided on the sliders 51 and 52 have a claw portion capable of clamping the widthwise end portion of the band-shaped sheet S, and a driving source for causing the claw portion to perform a clamping operation and a clamping release operation. . Further, each slider 51, 52 is configured to intermittently convey the strip-shaped sheet S by clamping the both ends in the width direction of the strip-shaped sheet S by the clamping mechanisms 53, 54 and is configured to be configured in one of the sliders 51 (or 52) While the belt-shaped sheet S is being clamped for intermittent conveyance, another slider 52 (or 51) releases the clamping of the belt-shaped sheet S and returns to the origin position. In other words, the two sliders 51 and 52 will move relative to each other simultaneously on the same track 55.

In this way, the two sliders 51 and 52 having a clamping mechanism are relatively moved, whereby even if the belt-shaped sheet S is intermittently conveyed while being clamped at both ends in the width direction, the press 4 can still be used. The high-speed press processing conveys the belt-shaped sheet S at high speed. Since the clamping mechanisms 53 and 54 clamp only a part of both ends of the strip-shaped sheet S in the width direction, the contact area with the strip-shaped sheet S is very small, and therefore, foreign matter can be prevented from adhering to the strip-shaped sheet S that becomes a product. s surface. In addition, since the two sliders 51 and 52 having a clamping mechanism are moved relatively and synchronously, the vibrations generated by the movement of the sliders 51 and 52 will cancel each other, so the punching device 1 does not face the slider. The moving directions of 51 and 52 are shaken. In this embodiment, the movement from the origin position of one slide to the forward limit (1 intermittent conveyance) corresponds to the first press working of the press 4, but it can also be set to slide from 2 The movement from the origin position of the piece to the forward limit (two intermittent conveyances) corresponds to one press working of the press 4.

The winder 2 includes a servo motor 22 and an ultrasonic sensor 23 that continuously rotate the reel 21. The ultrasonic sensor 23 is a coil diameter detection mechanism that can detect the coil diameter of the coil 21. In addition to the above-mentioned ultrasonic sensor 23, the coil diameter detection mechanism may use various sensors such as a laser sensor and an infrared sensor. Further, the punching device 1 includes a pull-out control unit 8 that can control the continuous pull-out speed of the strip-shaped sheet S from the reel 21 of the winder 2. The pull-out control unit 8 can control the rotation number of the servo motor 22 based on the diameter of the reel 21 detected by the ultrasonic sensor 23 in accordance with the conveying speed of the belt-shaped sheet S into the press 4. The strip-shaped sheet S is continuously pulled out, and controlled so that the U-shaped lower end height variation of the strip-shaped sheet S detected by the laser sensor 37 of the first sheet tension mechanism 3A is kept within a small range. For example, the pull-out control unit 8 controls the number of rotations of the reel 21 (that is, the number of rotations of the servo motor 22) according to the winding diameter of the reel 21, so as to continuously pull out the strip-shaped sheet S from the winder 2. The pull-out speed coincides with the average value of the conveyance speed at which the intermittent conveyance mechanism 5 intermittently conveys the sheet-like sheet S into the press 4. Furthermore, when the first sheet tension mechanism 3A is a laser sensor, When the height variation of the U-shaped lower end of the strip-shaped sheet S detected in 37 exceeds a minute range, the number of revolutions of the servo motor 22 is corrected so that the height variation of the U-shaped lower end of the strip-shaped sheet S is maintained within a small range. . Here, for example, the above-mentioned minute range may be set to a drop range of 80 mm or less.

In this way, since the U-shaped lower end height variation of the band-shaped sheet S in the duct 31 of the first sheet tension mechanism 3A can be kept within a small range by the pull-out control section 8, even for high-speed pressure processing, The high-speed conveyance of the belt-shaped sheet S can also prevent the U-shaped lower end of the belt-shaped sheet S of the first sheet tension mechanism 3A from rising sharply. Thereby, when the sheet conveyance is stopped, the movement inertia of the band-shaped sheet S can be prevented from increasing. Therefore, even if the belt-shaped sheet S is conveyed at high speed for high-speed pressure processing, the sheet can be conveyed smoothly without causing an error in the amount of sheet conveyance. In addition, a large tension is not applied to the band-shaped sheet S and the band-shaped sheet S is not broken.

As described above, in the punching device 1, even if the belt-shaped sheet S is conveyed at a high speed, the sheet can be smoothly conveyed without causing a conveyance error of the belt-shaped sheet S. Furthermore, foreign matter does not adhere to the surface of the band-shaped sheet S or the band-shaped sheet S is not broken. Therefore, productivity can be greatly improved, and a high-quality strip-shaped sheet S product can be provided.

In addition, the rewinder 7 also has the same structure as the winder 2, and the punching device 1 has a winding control unit 9 that can control the reel 71 of the rewinder 7 that continuously winds the strip-shaped sheet S. Winding speed. The winding control unit 9 can be detected by an ultrasonic sensor 73 (same as the above-mentioned winding diameter detection mechanism 23) as a winding diameter detection mechanism in accordance with the conveying speed of the belt-shaped sheet S in the press 4. The reel diameter of the reel 71 controls the number of revolutions of the servo motor 72 to continuously wind the pressure-processed strip-shaped sheet S, and controls the laser sensor of the second sheet tension mechanism 3B. The height variation of the U-shaped lower end of the strip-shaped sheet S detected in 37 remains within a small range. For example, the winding control unit 9 may control the number of rotations of the reel 71 (that is, the number of rotations of the servo motor 72) according to the winding diameter of the reel 71, so that The continuous winding speed of the strip-shaped sheet S of the rewinder 7 is consistent with the average value of the conveyance speed of the strip-shaped sheet S intermittently conveyed into the press 4 by the intermittent conveyance mechanism 5. Furthermore, when the height variation of the U-shaped lower end of the strip-shaped sheet S detected by the laser sensor 37 of the second sheet tension mechanism 3B exceeds a small range, the number of revolutions of the servo motor 72 is corrected so that The U-shaped lower end height variation of the band-shaped sheet S is kept within a small range. The minute range here is the same as the above, and it can be set to a drop range of 80 mm or less, for example.

This prevents the U-shaped lower end of the band-shaped sheet S of the second sheet tension mechanism 3B from being dropped sharply even if the band-shaped sheet S is conveyed at high speed in response to high-speed press processing, and the band-shaped sheet S can be prevented. Shaking. Therefore, even if the belt-shaped sheet S is conveyed at a high speed, the belt-shaped sheet S can be smoothly wound onto the reel 71 of the rewinder 7.

The press 4 includes a mold 41 composed of an upper mold, a lower mold, and a mold release, and a lifting mechanism for raising and lowering the upper mold. The mold 41 can perform predetermined pressure processing on the belt-shaped sheet S.

The upper part of the press 4 is provided with a pair of upper and lower back tension rollers 42 driven by a servo motor. A belt-shaped sheet S can be arranged between the upper and lower back tension rollers 42. The back tension roller 42 can be rotated and stopped in synchronization with the intermittent conveyance of the belt-like sheet S performed by the sliders 51 and 52 of the intermittent conveyance mechanism 5. By stopping the rotation of the back tension roller 42, it is also possible to prevent the belt-shaped sheet S from being excessively transported by the inertial force when the sheet transport is stopped.

The exit side of the press 4 is provided with a holder 43 that can hold both ends in the width direction of the band-shaped sheet S. The gripper 43 grips both ends of the strip-shaped sheet S in the width direction when the sheet conveyance is stopped. This can also prevent the belt-shaped sheet S from being excessively transported by the inertial force when the sheet transport is stopped.

However, the present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the gist of the present invention. For example, the intermittent conveyance mechanism 5 may be arranged on the inlet side of the press 4.

Claims (3)

A sheet tension mechanism includes a box-shaped tube, a sheet conveying path provided in a processing device for processing a strip-shaped sheet, and an air extractor that attracts and conveys the conveyed strip-shaped sheet. The tension makes the U-shaped drop from the pipe into the pipe, and the entrance roller and the exit roller are respectively arranged at the entrance and exit of the strip-shaped sheet at the upper end of the pipeline to guide the strip-shaped sheet. The above entry roller and above exit roller are arranged so that at least a part is closer to the inside than the inner wall surface of the pipe, so that a gap between the U-shaped strip sheet in the pipe and the inner wall surface of the pipe is used as an air passage for the air extractor; The air machine has a fan capable of generating attractive force. A pressure sensor capable of detecting the pressure in the pipe is provided between the band-shaped sheet and the fan in the duct. The sheet tension mechanism further includes a fan control section. The control unit may reduce the number of fan revolutions when the internal pressure of the pipe detected by the pressure sensor is lower than a certain value. For example, the sheet tension mechanism of claim 1, wherein the entry roller and the exit roller are composed of small-diameter rollers, and the small-diameter rollers are arranged in a large number to draw an arc track. The sheet tension mechanism according to claim 1 or 2, wherein the pipe is formed with an embossed shape on an inner wall surface facing the U-shaped band-shaped sheet.