JPH0435319Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sheet material punching device for punching a flexible sheet material such as a nonwoven fabric into a predetermined shape using a die set, and in particular, the present invention relates to a sheet material punching device for punching a flexible sheet material such as a nonwoven fabric into a predetermined shape using a die set. This invention relates to a sheet material punching device with an improved means for conveying the sheet material while being tensioned within the sheet material.

(Prior Art) Floppy disks have conventionally been used, in which magnetic layers are formed on both sides of a disc-shaped base made of a flexible polyester sheet, etc., and magnetic recording is performed on the magnetic layers by a magnetic head while rotating at high speed. It is widely used as a recording medium for computers due to its ease of handling and low cost. On the other hand, by taking advantage of these advantages of floppy disks and the unique advantage of magnetic recording, which is that the recording medium can be reused, which silver halide film does not have, a smaller version of the floppy disk is being used as an image recording medium. Still cameras have also been proposed. The magnetic disk used in still cameras and the like consists of a small diameter and extremely thin magnetic disk sheet rotatably housed in a small hard case, and is used as a magnetic disk cartridge.

The magnetic disk cartridge as described above is generally provided with a liner for removing dirt, dust, etc. adhering to the surface of the magnetic disk sheet. Conventionally, this liner is made of, for example, a nonwoven fabric made of a blend of rayon and polyester, and is fixed to the inner wall surface of the case facing the magnetic disk sheet so that it lightly contacts the surface of the magnetic disk sheet. Therefore, when the magnetic disk sheet is rotated, the entire surface of the sheet is cleaned by the liner, and the above-mentioned dirt, dust, etc. are removed.

In many cases, the above-mentioned liner is formed by continuously punching a long strip of non-woven fabric between a die and a punch of a die set, and by feeding the non-woven fabric in pitches and operating the punch intermittently. be done. When a nonwoven fabric is punched out by a sheet material punching device equipped with such a die set, the nonwoven fabric placed between the die and the punch must be kept flat and taut.
Therefore, conventionally, a conveyance roller consisting of a nip roller is provided on the downstream side in the nonwoven fabric feeding direction with the die set in between, while a tension applying means such as a dancer roller is provided on the upstream side, and the nonwoven fabric is While conveying the nonwoven fabric, tension is applied to the nonwoven fabric by generating resistance to this conveying force using a tension applying means.

However, since the above-mentioned conveyance rollers have to pinch the non-woven fabric which is easily bent as a leftover material with punched holes, it becomes impossible to convey the non-woven fabric at a uniform speed across its width, and as a result, the non-woven fabric becomes bent or bent. This will cause wrinkles. If the nonwoven fabric flexes or wrinkles within the die set, the liner may be die-cut to an incorrect shape.

The problems encountered when punching liners for magnetic disk cartridges from non-woven fabrics have been explained above, but these problems can be solved by continuously punching out liners for magnetic disk cartridges from non-woven fabrics using a die set while feeding the flexible sheet material in pitches. It is widely recognized in some cases.

(Purpose of the invention) Therefore, the present invention solves the above problems and
It is an object of the present invention to provide a sheet material punching device that can always punch out a flexible sheet material into the correct shape.

(Structure of the invention) The sheet material punching device of the present invention is a sheet material punching device that punches out a band-shaped flexible sheet material by a die set while pitch-feeding it as described above. To,
A main conveyance roller is provided which consists of a nip roller that pinches the sheet material and feeds the sheet material in pitches, and is located downstream of the die set in the sheet material feeding direction.
A roller larger than the main conveyance roller is used to suction air from a large number of air suction holes provided on the circumferential surface to adsorb the sheet material to the circumferential surface, and to feed the sheet material in the pitch feeding direction. The present invention is characterized in that a sub-conveyance roller is provided which continuously rotates while slipping against the sheet material at a circumferential speed.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

1 and 2 show a sheet material punching device according to an embodiment of the present invention. The sheet material punching apparatus of this embodiment is for punching and forming the above-mentioned liner, as an example.
As shown in FIG. 1, the delivery roller 10 includes:
A band-shaped nonwoven fabric 11 made of the above-mentioned material is wound and stored. The leading end of the nonwoven fabric 11 is hooked onto a winding roller 12, and as the winding roller 12 is rotated in the direction of arrow A as described later, the nonwoven fabric 11 is wound around the winding roller 12 from the leading end side. It will be done. Both rollers 1 above
A die set 13 is arranged between 0 and 12.
A main conveyance roller 14 consisting of a pair of nip rollers 14A and 14B is disposed on the side closer to the feed roller 10 than the die set 13, that is, on the upstream side in the nonwoven fabric feeding direction, and on the other hand, on the downstream side of the die set 13 in the nonwoven fabric feeding direction. A sub-conveyance roller 15 is provided.

The nonwoven fabric 11 is passed from the delivery roller 10 to the guide roller 16 and the dancer roller 17, passed through the main conveyance roller 14, and is pitch-fed by the main conveyance roller 14, which is driven as described below. The dancer roller 17 is rotatably attached to an arm 18, which is swingable about a shaft 19 and biased clockwise in the figure. Therefore, the dancer roller 17 pulls the nonwoven fabric 11 downward between the guide roller 16 and the main conveyance roller 14, applying tension to the nonwoven fabric 11.

One nip roller 14B constituting the main conveyance roller 14 is a drive roller rotated by a drive device (not shown), and the other nip roller 14B is rotated by a drive device (not shown).
4A is a driven roller. The drive roller 14B is rotated a predetermined amount clockwise in the figure at predetermined time intervals. As a result, the nonwoven fabric 11 is pitch-fed by a predetermined length from the left side to the right side in the figure within the die set 13.

The die set 13 includes an upper die 2 to which a die 20 is fixed.
1, and a lower mold 24 provided with a punch 22 and a stripper plate 23 that enter the die 20 from below. The nonwoven fabric 11 is placed under tension between the upper mold 21 and the lower mold 24. Therefore, after the main conveyance roller 14 is stopped, the lower mold 24 is raised by a known mechanism, the stripper plate 23 clamps the nonwoven fabric 11 between it and the die 20, and the punch 22 moves inside the die 20. When the nonwoven fabric 11 enters the machine, the nonwoven fabric 11 is punched out according to the shape of the punch 22, and a liner 11a for a magnetic disk cartridge is obtained. The liner 11a punched and formed in this way is attracted to, for example, a suction arm 25 that moves up and down, and is inserted into the die set 13.
is discharged outside. After punching out the liner 11a, the lower mold 24 is lowered and the punch 22 is inserted into the die 20.
After being separated from the nonwoven fabric 11, the nonwoven fabric 11 is successively fed a predetermined length in the same manner as described above. Thereafter, the above-described operation is repeated, and liners 11a are successively punched and formed from the nonwoven fabric 11.

Here, the nonwoven fabric 11 is required to be flat and under tension within the die set 13. Otherwise, the liner 11a stamped and formed by this die set 13 will have an incorrect shape. Hereinafter, a mechanism for applying tension to the nonwoven fabric 11 and tensioning it as described above will be explained. As mentioned above, the sub-conveyance roller 15 has flange portions 3 at both ends, as shown in detail in FIG.
It consists of an outer cylinder 32 having a diameter of 0 and 31, and a shaft 35 that rotatably supports the outer cylinder 32 via bearings 33 and 34. The outer cylinder 32 has a circumferential surface 3
2a is provided with a large number of air suction holes 32b (see FIG. 2), and each of the air suction holes 32b has a cylindrical shape that is defined between the outer cylinder 32 and the shaft 35 and is airtight with the outside. It communicates with the space 36 of. An air suction passage 38 is provided within the shaft 35 and has one end communicating with the space 36 and the other end connected to a vacuum pump 37 via a pipe 42. Therefore, when the vacuum pump 37 is operated, air is sucked into the inner side of the outer cylinder 32 from the numerous air suction holes 32b of the outer cylinder peripheral surface 32a. The outer cylinder 32 is connected to the drive device 4 via gears 39 and 40.
1, it is rotated in the direction of arrow B in FIG.

When punching out the nonwoven fabric 11 using the die set 13, the drive roller 14B is driven intermittently as described above, but the outer cylinder 32 of the sub-conveyance roller 15 is continuously rotated. Note that the circumferential speed of this outer cylinder 32 is set to be slightly faster than the main speed of the drive roller 14B. Further, while the outer cylinder 32 is being rotated in this manner, air is continuously sucked from the air suction hole 32b. The nonwoven fabric 11 is attached to the flange portion 3
Although it is hung on the outer cylinder 32 between 0 and 31,
Since air is sucked from the air suction holes 32b as described above, the nonwoven fabric 11 with high air permeability as is well known
is relatively lightly adsorbed to the circumferential surface 32a of the outer cylinder 32. When the drive roller 14B is rotated, the nonwoven fabric 11 is given a conveyance force by the drive roller 14B and the outer cylinder 32, and is sent to the take-up roller 12 side as described above. At this time, since the circumferential speeds of the outer cylinder 32 and the drive roller 14B are set as described above, tension is applied to the nonwoven fabric 11 between the drive roller 14B and the outer cylinder 32. At this time, the difference in circumferential speed between the outer cylinder 32 and the drive roller 14B, that is, the difference in the nonwoven fabric conveying speed, is absorbed by the outer cylinder 32 slipping against the nonwoven fabric 11.

As shown in FIG. 2, the outer cylinder 32 conveys the nonwoven fabric 11 as a residual material in which the punched holes 11b are formed.
Since the nonwoven fabric 11 is suctioned and held by air suction from the nonwoven fabric 2b, there is no need to strongly pull only a specific part of the nonwoven fabric 11. In other words, nonwoven fabric 11
is conveyed at a uniform speed across its width, and is prevented from being bent or wrinkled within the die set 13.

When the nonwoven fabric 11 is punched out by the die set 13, the main conveyance roller 14, that is, the drive roller 14B is stopped as described above, but the outer cylinder 32 of the sub conveyance roller 15 rotates while slipping against the nonwoven fabric 11. This continues to apply tension to the nonwoven fabric 11 at all times. Note that the nonwoven fabric 11 as a residual material sent from the sub-conveyance roller 15 to the take-up roller 12 side
is adapted to hang down as shown in FIG. 1, and when the nonwoven fabric 11 hangs down for a predetermined length, its lower end is detected by a photoelectric sensor comprising, for example, a light emitting section 50 and a light receiving section 51. When a nonwoven fabric detection signal is output from this sensor, the drive means (not shown) for the winding roller 12 is activated.
2 is rotated by a predetermined amount, and the nonwoven fabric 11 is wound around the winding roller 12.

The embodiment device described above is formed to punch out nonwoven fabric 11 as an example of a sheet material, but the device of the present invention can also be formed as a device to punch out band-shaped flexible sheet materials other than this nonwoven fabric 11. It is possible.

(Effects of the invention) As explained in detail above, according to the sheet material punching device of the present invention, flexible sheet materials such as nonwoven fabrics can be
Since the sheet material can be stably conveyed within the die set without bending or wrinkling, it becomes possible to always punch out the sheet material in the correct shape, and the yield of sheet material punching and forming improves. In addition, in this device, the sub-conveyance roller is constantly rotating while the main conveyance roller is rotating and while it is stopped, applying tension to the sheet material, so the main conveyance roller is stopped. Even if the sheet material suddenly rotates at a high speed, the sheet material will not loosen between the roller and the sub-conveyance roller. Therefore, with this device, it is possible to convey sheet materials at high speed,
Sheet material punching work can be performed efficiently. In the device of the present invention, the sub-conveyance roller is simply rotated continuously, so
Compared to a device that rotates and stops the sub-conveyance roller in accordance with the conveyance and stop of the sheet material, the sheet material conveyance system can be formed inexpensively and simply.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view showing an embodiment of the device of the present invention, Fig. 2 is a perspective view showing a part of the above embodiment device, and Fig. 3 is a part showing in detail the sub-conveyance roller of the above embodiment device. FIG. 10... Delivery roller, 11... Nonwoven fabric, 12
... Winding roller, 13 ... Die set, 14 ...
...Main transport roller, 15...Sub-transport roller, 32...
... Outer cylinder, 32b ... Air suction hole, 37 ... Vacuum pump, 38 ... Air suction passage, 39, 40 ... Gear, 41 ... Drive device.

Claims (1)

[Scope of Claim for Utility Model Registration] In a sheet material punching device that punches out a pitch-fed band-shaped flexible sheet material using a die set, a nipper roller that clamps the sheet material is provided upstream of the die set in the sheet material feeding direction. A main conveyance roller is provided which feeds the sheet material in pitches, and a main conveyance roller is provided which feeds the sheet material in pitches, and air suction is performed from a number of air suction holes provided on the circumferential surface downstream of the die set in the sheet material feeding direction. A sub-conveyance roller is provided that continuously rotates while slipping against the sheet material at a circumferential speed greater than that of the main conveyance roller so as to adsorb the sheet material to the circumferential surface and feed the sheet material in the pitch feeding direction. A sheet material punching device characterized by: