JPH0524287A - Device for holding sheet-shaped matter - Google Patents

Abstract

PURPOSE:To effect holding, attaching, and detaching of a sheet-shaped matter in a simple and firm manner by a method wherein, in a device for holding each of the upper and lower sides of a sheet-shaped matter along the entire width thereof, an axis is inserted into a ring provided in both sheet receiving parts on the side of a table and on a pressing side and an elastic material is inserted between said part and the axis. CONSTITUTION:The main body of a device is fixed to a notch 2 formed in the surface of a cylindrical drum 1. A plurality of rings 3, 6 for bearing are disposed in each of both sheet receiving parts 4, 5 on a table side and a pressing side so that an axis 7 is inserted through these rings. The axis 7 is supported by an axis supporting member 8 and a pinion gear 9 as a driven means is mounted to each of both ends of the axis 7. A groove 10 as a recess is formed on the axis 7 and a hole 11 is formed in each of the parts 4, 5 so that both ends of a torsion spring 12 as an elastic member are inserted into said ends. By rotating a L-shaped lever 14 on which a rack gear 13 in mating engagement with the gear 9 is formed, the part 5 on pressing side is opened and closed through the spring 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material holding device. More specifically, the present invention relates to a sheet-like object holding device that can easily attach and detach a sheet-like object and can hold the sheet-like object uniformly in the width direction.

[0002]

2. Description of the Related Art Recently, an image forming material in which a photosensitive layer is coated on one surface of a support is subjected to image exposure, and then the image formed on the photosensitive layer is exposed to a paper or the like generally under heating. One-color or multi-color prepress proofs suitable for proof printing to be transferred to the image receptor have been prepared.

As an apparatus for producing the above-mentioned prepress proof, an impression cylinder having an image forming material attached thereto and a transfer cylinder having an image receiving member attached thereto are arranged so that the photosensitive layer of the image forming material and the image receiving member face each other. An apparatus has been generally proposed in which both cylinders are brought into contact with each other and the image formed on the photosensitive layer is transferred to an image receptor at a nip between the cylinders. In such a device, as a device for attaching an image receptor such as paper on a transfer cylinder, a device that can easily attach and detach a sheet-like object such as a conventional sheet-like object and can hold it uniformly over the entire width has been developed. It has been strongly sought after, but has not yet been developed.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a sheet-shaped material holding device which can easily attach and detach the sheet-shaped material and can hold the sheet-shaped material with a uniform force over the entire width.

[0005]

According to the present invention, in a holding device for holding the upper side and the lower side of a sheet-shaped object over the entire width direction, at least one of the holding devices holds a sheet-shaped object. A receiving portion, a pressing-side sheet receiving portion, at least one bearing ring provided in each of the base-side sheet receiving portion and the pressing-side sheet receiving portion, and a recess in the axial direction into which the bearing ring is fitted. Provided is a sheet-like object holding device comprising a shaft having driven means mounted at both ends, at least one hole recessed in a pressing-side sheet receiving portion, and an elastic member having both ends inserted in the recess. .

The present invention will be described below with reference to the accompanying drawings.

1 and 2 show a sheet-shaped object holding device according to the present invention, in which the holding device is installed on the surface of a cylindrical body,
It is explanatory drawing which shows the aspect in case a to-be-driven means is a pinion gear. The sheet-like object holding device of the present invention is installed in the cutout portion 2 provided on the surface of the cylindrical body 1. A plurality of bearing rings 3 are provided in the longitudinal direction of the base-side sheet receiving portion 4. A plurality of bearing rings 6 are also provided on the pressing-side sheet receiving portion 5. The shaft 7 is fitted into the bearing rings 3 and 6. The bearing rings 3 and 6 may be any one as long as the shaft 7 can be fitted therein, and may be one in which a cutout portion is provided. The shaft 7 is supported by a shaft support member 8 installed on the end surface of the cylindrical body 1. Pinion gears 9 are attached to both ends of the shaft 7 as driven means. The shaft 7 is provided with a recess, in this example a groove 10. A hole 11 is provided in each of the base-side sheet receiving portion 4 and the pressing-side sheet receiving portion 5, and the groove 1
An elastic member having both ends inserted into the hole 0 and the hole 11, in this example, a torsion spring 12 is installed.

FIG. 1 shows an example in which the pinion gear 9 is rotated by an L-shaped lever 14 provided with a rack gear 13 that meshes with the pinion gear 9. L-shaped lever 14 is a fulcrum 15
Is rotatably attached to the end surface of the cylindrical body 1, and a cam 16 is brought into contact with the end of the L-shaped lever 14, and the L-shaped lever 14 is rotated by the cam 16. Further, elastic means having both ends fixed to the end face of the cylindrical body 1 and the L-shaped lever 14 such as a coil spring 19 is provided, and the cam side end portion of the L-shaped lever 14 is pulled upward, whereby the pressing-side sheet receiving member is received. Apply force in the direction to close the part 5. FIG. 2 is an example in which the pinion gear 9 is rotated by the gears 17 and 18 to open and close the pressing side sheet receiving portion 5. The gear 18 is driven by means capable of controlling rotation / stop at an arbitrary position, for example, a stepping motor (not shown), or the gear 18
It is preferable to provide a lock mechanism (not shown) such as a ratchet to the gear so that the gear can be fixed at a desired position. In the present invention, both ends of the sheet-shaped material may be held by the sheet-shaped material holding device of the present invention, and in some cases, only one end is held by the sheet-shaped material holding device of the present invention, The other end may be held by another holding device, such as a clamp.

The operation of the sheet-like material holding device of the present invention will be described below. The base-side sheet receiving portion 4 and the pressing-side sheet receiving portion 5 are held in a predetermined positional relationship by the shaft 7 and the elastic member 12 into which the bearing rings 3 and 6 provided respectively are inserted, and the phase shift is caused. It never happens. The pressing side sheet receiving portion 5 is opened and closed through the elastic member 12 by the rotation of the driven means provided at both ends of the shaft 7, in this example, the pinion gear 9. The driven means is not limited to the pinion gear, and is not particularly limited as long as it can rotate the shaft 7 such as a pulley, and an appropriate means can be adopted. For example, you may rely on manual operation by levering.

[0010]

According to the present invention, since the sheet-like object is grasped by the force of the elastic member, a sheet-like object grasping device which can grasp the sheet-like object with a uniform force over the entire width of the sheet-like object is provided. Further, according to the present invention, there is provided a sheet-shaped object holding device capable of attaching and detaching the sheet-shaped object by a simple operation.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a sheet-shaped material holding device.

FIG. 2 is a schematic cross-sectional view showing another aspect of the sheet-like object holding device driving means.

[Explanation of symbols]

 1 Cylindrical barrel 3 Bearing ring 4 Seat receiving part 5 Seat side receiving part 6 Bearing ring 9 Bearing ring 9 Pinion gear 12 Torsion spring

Claims (1)

Claim: What is claimed is: 1. A holding device for holding an upper side and a lower side of a sheet-shaped object over the entire width direction, wherein at least one of the holding devices holds a sheet-shaped object. And a pressing-side sheet receiving portion, at least one bearing ring provided in each of the base-side sheet receiving portion and the pressing-side sheet receiving portion, and a recessed portion in the axial direction through which the bearing ring is fitted and both end portions are provided. A sheet-like object holding device comprising: a shaft having driven means mounted therein; at least one hole recessed in the pressing-side sheet receiving portion; and an elastic member having both ends inserted in the recess. .