JP2853447B2 - Image transfer device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image transfer apparatus excellent in workability. More specifically, an image transfer device comprising: an impression cylinder having a means for facilitating peeling of a protective film on an impression cylinder surface from an image forming material comprising a support, a photosensitive layer, and a protective film; and a transfer cylinder. About.

[0002]

2. Description of the Related Art Recently, an image-forming material having a photosensitive layer coated on one side of a support is image-exposed, and then the image formed on the photosensitive layer is heated, generally at about 100.degree. Monochromatic or multicolor prepress proofs suitable for proof printing or the like transferred to an image receptor such as paper have been produced. The image forming material includes a support, a photosensitive layer formed on one surface of the support, and a protective film. As the support and the protective film, a thin film or sheet made of a material such as cellulose acetate, polystyrene, polyvinyl chloride, or polyethylene terephthalate is used. As the image receiver, a printing material selected as appropriate, such as paper or film, is employed.

As an apparatus for producing the above-mentioned prepress proof or the like, an impression cylinder having an image forming material attached thereto and a transfer cylinder having an image receptor attached thereto are arranged such that a photosensitive layer of the image forming material and the image receptor are opposed to each other. In general, an apparatus has been proposed in which an image formed on a photosensitive layer is transferred to an image receptor in a nip between the two cylinders by contacting and pressing the cylinders. To produce a multicolor print or prepress proof, a color original is color-separated to produce image-exposed image forming materials of each color, for example, yellow, magenta, cyan and black, and then these image forming materials are sequentially formed. The image formed on the photosensitive layer of the material will be transferred to the image receptor.

For this reason, when preparing a multicolor prepress proof or the like, several image forming materials are used for the same image receptor. The image forming material is attached to the impression cylinder in a state where the protective film is laminated after the image exposure. The operator peels off the protective film on the impression cylinder by hand, but it is not easy to peel off the thin protective film, which significantly impairs the workability. In addition, when the protective film is peeled off, an unexposed portion, that is, an image portion may be rolled up. In this case, a beautiful printed matter cannot be obtained. In addition, as a device for applying the image forming material to the impression cylinder, a pin bar is generally used to facilitate registration of each color. However, the use of the pin bar sometimes causes flapping during rotation of the impression cylinder around the upper side of the image forming material. In this case, not only the workability but also the beauty of the printed matter may be impaired.

[0005]

There has been a strong demand for the development of means for easily removing a protective film from an image forming material without impairing print quality in an image forming material attaching apparatus for an impression cylinder. A device that satisfies the desire has not yet been developed.

[0006]

SUMMARY OF THE INVENTION The present invention comprises an impression cylinder having an image forming material attached thereto and a transfer cylinder having an image receptor attached thereto, and the image forming material and image receptor are rotated by rotating the impression cylinder and the transfer cylinder. Is introduced into a nip between an impression cylinder and a transfer cylinder to transfer an image formed on a photosensitive layer of the forming material to an image receptor. And a protective film laminated on the photosensitive layer. At least one protective film peeling means is provided on the impression cylinder at a position corresponding to a peripheral portion on the upper side of the image forming material. Provided is an image transfer device, characterized in that an adhesive tape is provided in a position inside a blanket surface in a hole provided in a blanket by a film peeling means.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional view of an image transfer apparatus used in the present invention, and FIG. 2 is an explanatory view of an impression cylinder for attaching an image forming material including a protective film peeling means from the image forming material of the present invention. FIG. 3 shows a sectional view of the protective film peeling means of the present invention.

Hereinafter, the configuration of the image transfer apparatus used in the present invention will be described with reference to FIG. A notch 2 is provided on the surface of the transfer cylinder 1, and a clamp including a claw 3 and a claw seat 4 serving as an upper side (holding side) attaching means of the image receptor and a lower side ( (Rear end side) A clamp composed of a claw 5 and a claw seat 6 as attachment means is installed. The claw 3 and the claw 5 are provided with a drive shaft 7 that can drive the claw manually or by a drive means such as an electric motor, and the claw is opened and closed by rotation of the drive shaft. Image receiver such as paper (not shown)
After being gripped by the clamp on the gripping side, the transfer cylinder is rotated in the direction of the arrow while pulling the image receptor, and is then attached to the transfer cylinder by gripping the image receptor with the grip on the gripping side.

The structure of the impression cylinder 8 will be described with reference to FIG. The impression cylinder 8 is partially provided with a notch 9, and a blanket 10 wound around the surface of the impression cylinder 8 is fixed in the notch by blanket fixing means 11. An inclined portion 12 is provided between the partially notched portion 9 and the surface of the impression cylinder (circumferential surface), and a pin bar 13 is installed in the inclined portion. The installation of the pin bar 13
This is performed by pressing the pin bar against the surface of the impression cylinder with a blanket having a hole formed at a position corresponding to the pin of the pin bar. The height of the pin bar 13 is such that the tip does not protrude outside the circumferential surface of the impression cylinder 8. This is to prevent the pin bar 13 or the surface of the transfer cylinder 1 from being damaged when the impression cylinder 8 and the transfer cylinder 1 rotate. The magnet sheet 14 is rotatably mounted in the partially cutout portion 9. An adhesive tape 15 is provided on the surface of the impression cylinder in the vicinity of the inclined portion 12 where the pin bar 13 is provided on the surface of the impression cylinder and in the vicinity of the other inclined portion of the partially cutout portion 9. When the magnet sheet 14 is tilted in the direction opposite to the arrow, it does not reach the adhesive tape 15 but has a width sufficient to cover the pin bar 13. Holes corresponding to the upper side pin bar 13 of the image forming material are provided, and after inserting these holes into the pin bar 13, the image forming material is suppressed by the magnet sheet 14.
Is rotated in the direction of the arrow, and the upper side and the lower side of the image forming material are fixed to the impression cylinder surface with the adhesive tape 15.

FIG. 2 is an explanatory view showing a state in which the protective film peeling means of the present invention is provided on an impression cylinder. The protective film peeling means 16 is provided on the periphery of the upper side (holding side) of the image forming material (not shown) attached to the impression cylinder 8. Protective film peeling means 1
3, a hole is formed in a predetermined position of the blanket 10 as shown in FIG. 3, and a means for adhering a support of an image forming material such as an adhesive tape 17 is provided in the hole. Blanket 10
In order to keep the difference in height between the upper surface of the device and the adhesive means within an appropriate range, a projection 18 may be provided in the hole of the blanket, and an adhesive tape 17 may be attached to the projection. In general, a blanket in which several layers of a rubber layer and a cloth layer are laminated is used, and is selected in consideration of elasticity, resilience and the like.

The operation of the image forming material attaching apparatus including the protective film peeling means of the present invention will be described below. After the image forming material having a hole formed in the position corresponding to the pin bar 13 is inserted into the pin bar to accurately perform the alignment, the impression cylinder 8 is rotated to hold the image forming material on the holding side adhesive tape and the holding tail side adhesive tape. To stick on the impression cylinder surface. Next, when the image forming material is pressed against the protective film peeling means 16 and the support is adhered to the adhesive tape 17, the protective film is separated from the photosensitive layer on the support by the step between the surface of the adhesive tape 17 and the surface of the blanket 10. Release. The protective film is easily peeled off by pulling the protective film.

[0012]

According to the present invention, the operability in which the protective film can be easily removed from the image forming material is improved, and a beautiful multicolored image without raising the unexposed portion, that is, the image portion, is produced. And an image transfer device capable of obtaining a printed material.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an image transfer device.

FIG. 2 is a schematic explanatory view of an impression cylinder provided with a protective film peeling means.

FIG. 3 is a sectional view of a protective film peeling means.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transfer cylinder 8 Impression cylinder 16 Protective film peeling means 17 Adhesive tape 18 Projection

Claims (1)

(57) [Claims] 1. An image forming apparatus comprising: an impression cylinder having an image forming material attached thereto; and a transfer cylinder having an image receptor attached thereto. The image forming material and the image receiving member are moved between the impression cylinder and the transfer cylinder by rotating the impression cylinder and the transfer cylinder. An image transfer device for transferring an image formed on a photosensitive layer of the forming material to an image receptor by introducing the image forming material into a nip between the support and the photosensitive layer coated on the support; And at least one protective film peeling means provided on the impression cylinder at a position corresponding to the upper side peripheral portion of the image forming material, the protective film peeling means being provided on a blanket. An image transfer apparatus, wherein an adhesive tape is provided in the hole at a position inside the blanket surface.