JPH06329296A - Pinch device - Google Patents

Abstract

PURPOSE:To easily prevent a belt shaped sheet from being defectively fed and meandering by winding a rubber belt narrower in width than a drive roll onto a driven roll in the pinch device which comprises the drive roll provided with a hard roll surface, and a driven roll holding the belt shaped sheet interspaced with the drive roll. CONSTITUTION:The device is equipped with a drive roll 21 and a driven roll 23, and applies driving force to the roll with a belt shaped sheet 25 held between these rolls. Since a rubber belt 33 narrower in width than the drive roll 21 is wound over the driven roll 23, the rubber belt 33 is in contact with the belt shaped sheet 25. By this constitution, after the device has been in use for a long time, only the rubber belt 33 is worn out, the replacement of only the rubber belt can prevent the rubber sheet 25 from being defectively fed and meandering. Besides, if only the rubber sheet 33 is set to be narrower in width than the belt shaped sheet 25, since the rubber belt 33 is brought into contact uniformly with the belt shaped sheet 25, the rubber belt is thereby uniformly worn out, its cylindricity can be kept excellent for a long time even if it is not replaced with a new one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pinch device for sandwiching and feeding a belt-shaped sheet between a driving roll and a driven roll.

[0002]

2. Description of the Related Art Generally, in order to feed a strip-shaped sheet in its longitudinal direction, a pinch device is used which sandwiches and drives the strip-shaped sheet between a driving roll and a driven roll.

A conventional pinch device, as shown in FIG.
A driving roll 11 and a driven roll 13 are provided, and a belt-shaped sheet 15 is sandwiched between these rolls to apply a driving force. The drive roll 11 is rotationally fixed to a drive shaft 17 connected to a drive source (not shown). The drive roll 11 is made of a hard material such as metal and is formed into a cylindrical shape, and the surface of the roll is plated with metal. The driven roll 13 is rotationally fixed to a driven shaft 19 which is rotatably supported. The roll surface of the driven roll 11 is made of rubber,
It is formed in a cylindrical shape. The width of the driven roll 13 is wider than that of the belt-shaped sheet 15, and is equal to the width of the drive roll 11.

[0004]

When the conventional pinch device is used for a long period of time, the center portion of the roll surface of the driven roller 13 made of rubber changes due to abrasion or hardening as shown in FIG. That is, the central portion of the rubber roll is worn or hardened due to long-term contact with the belt-shaped material, and its diameter changes to become thin. That is, the cylindricity of the entire rubber roll changes.

When the diameter of the driven roll 13 becomes thin, in the case of the thin strip sheet 15, the drive roll 11 slips and the strip sheet 15 cannot be fed. As a result, the belt-shaped sheet 15 may be cut in the furnace due to defective feeding.

Further, in the case of a thick sheet, since the diameter of the central portion of the driven roll 13 is smaller than the diameter of the peripheral portion, the pressing force on the strip-shaped sheet 15 becomes non-uniform in the width direction, and the strip-shaped sheet 15 is formed. It becomes easier to meander. As a result, the strip-shaped sheet 15 is bitten into the peripheral portion, and curls occur at the ears of the strip-shaped sheet 15. In particular, when the edge of the strip-shaped sheet 15 has an uneven thickness, the meandering is more likely to occur.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pinch device which can easily prevent feeding failure and meandering of a belt-shaped sheet.

[0008]

In order to achieve the above object, the present invention provides a drive roll having a hard roll surface,
In a pinch device having a driven roll that sandwiches a belt-shaped sheet between the driven roll and a rubber roll having a width narrower than that of the drive roll, the driven roll is wound around the driven roll. Is.

[0009]

In the present invention, since the driven roll is wound with the rubber band which is narrower than the drive roll, the rubber band comes into contact with the belt-shaped sheet. Therefore, even if it is used for a long period of time, only the rubber band is worn, so that it is possible to prevent defective feeding and meandering of the band-shaped sheet simply by replacing the rubber band.

If the rubber band is made narrower than the band-shaped sheet, the rubber band contacts the band-shaped sheet evenly, so that the rubber band wears almost uniformly, and good cylindricity is maintained without any special replacement. It can be maintained for a period of time, and it is possible to prevent feeding failure and meandering of the belt-shaped sheet.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the pinch device according to the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the pinch device comprises a driving roll 21 and a driven roll 23, and a belt-like sheet 25 is sandwiched between these rolls to apply a driving force.

The drive roll 21 is rotationally fixed to a drive shaft 27 connected to a drive source (not shown). The drive roll 21 is made of a hard material such as metal or hard resin, and is formed in a cylindrical shape, and the roll surface is plated with metal or the like.

The driven roll 23 is rotationally fixed to a driven shaft 29 which is rotatably supported. The driven roll 23 has a cylindrical roll support portion 31 made of metal, hard resin, or the like,
A rubber band 33 is wound around the outer circumference of the roll support portion 31. The rubber band 33 is made of a rubber material having excellent abrasion resistance such as Teflon rubber, silicon rubber, or natural rubber.

The roll support portion 31 has the same width as the drive roll 21, and the rubber band 33 has a width narrower than the width of the drive roll 21. The outer peripheral surface of the rubber band 33 is a band-shaped sheet 25.
The belt-shaped sheet 25 is applied with a predetermined pressing force by its elastic force.

In this example, the rubber band 33 is the roll supporting portion 31.
Is provided only on the outer circumference of the central portion of the rubber sheet 33, and the entire outer circumference of the rubber band 33 uniformly contacts the belt-shaped sheet 25. When the pinch device formed in this way is used for a long period of time, the belt-shaped sheet 2
The outer peripheral surface of the rubber band 33 coming into contact with 5 is worn. However, since the entire outer peripheral surface of the rubber band 33 is evenly contacted with the belt-shaped sheet 25 and is worn substantially uniformly, the cylindricity of the rubber band 33 does not change and good cylindricity can be maintained. As a result, the diameter of the outer circumference of the rubber band 33 can be made uniform in any part, and the band-shaped sheet 25 can be prevented from meandering. Further, since the outer peripheral surface of the rubber band 33 does not come into contact with the edge portion of the belt-shaped sheet 25, it is possible to further avoid meandering of the belt-shaped sheet 25 due to uneven thickness of the sheet edge portion.

Further, since the cylindricity of the rubber band 33 is kept good, the outer peripheral surface of the rubber band 33 contacts the band-shaped sheet 25 evenly, slip is prevented, and feeding failure of the band-shaped sheet 25 is prevented. be able to. The rubber band 33
Since it is in a wound state, if the surface is abraded, it may be replaced as appropriate according to the degree of abrasion.

Moreover, in this example, the outer peripheral surface of the rubber band 33 is evenly worn, so that the life of the rubber band 33 can be extended. For example, it is possible to extend the life of the conventional driven roll from about 7 years to about 15 years.

Further, since the portion where the rubber band 33 is provided is made smaller than the conventional one, the material cost of the rubber band 33 can be reduced and the manufacturing cost can be reduced.

[0020]

As described above, in the pinch device according to the present invention, the width of the elastic roll surface of the driven roll is made narrower than the drive roll width, so that the meandering and feeding failure of the belt-shaped sheet can be easily performed. Can be prevented.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a pinch device according to the present invention.

FIG. 2 is a front view showing a conventional pinch device.

[Explanation of symbols]

 21 drive roll, 23 driven roll, 25 belt-like sheet, 27 drive shaft, 29 driven shaft, 31 roll support part, 33 rubber band.

Claims (1)

[Claims] 1. A drive roll having a hard roll surface,
In a pinch device having a driven roll that sandwiches a belt-like sheet between the driving roll and the driving roll, a rubber band narrower than the driving roll is wound around the driven roll. Pinch device.