An image transfer apparatus which comprises a platen (8) to which an image-forming material is to be attached and a transfer cylinder (1) to which an image receptor is to be attached, and which is for transferring an image formed in a photosensitive layer of an image-forming material to an image receptor by the introduction of the image-forming material and the image receptor into a nip formed by the platen and the transfer cylinder by the rotation of the platen and the transfer cylinder, the apparatus having an image-forming material attaching device comprising a device for holding the top end side of the image receptor to a platen surface along the entire width of the image receptor and a device for holding the bottom end side of the image receptor to a platen surface along the entire width of the image receptor, the device for holding the top end side being a pin bar (13) having pins protruded from an inside of a blanket (10) in a slope portion (12) continued from a partial cut-off portion formed in the platen.
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4. An image transfer apparatus comprising a platen to which an image-forming material is to be attached and a transfer cylinder to which an image receptor is to be attached, and which is for transferring an image formed in a photosensitive layer of an image-forming material to an image receptor into a nip formed by the platen and the transfer cylinder by the rotation of the platen and the transfer cylinder, the image transfer apparatus further comprising:
a platen surface on the platen and a slope portion that slopes inwardly from the platen surface; a blanket covering the platen surface and the slope portion, the blanket having an outer surface; and an image-forming material attaching device comprising a device for holding a top end side of the image-forming material to the platen surface, said image-forming material attaching device comprising a pin bar having pins extending through the outer surface of the blanket.
1. An image transfer apparatus, which comprises a platen to which an image-forming material is to be attached and a transfer cylinder to which an image receptor is to be attached, and which is for transferring an image formed in a photosensitive layer of an image-forming material to an image receptor by the introduction of the image-forming material and the image receptor into a nip formed by the platen and the transfer cylinder by the rotation of the platen and the transfer cylinder,
the apparatus having an image-forming material attaching device comprising a device for holding the top end side of the image receptor image-forming material to a platen surface along the entire width of the image receptor image-forming material and a device for holding the bottom end side of the image receptor image-forming material to a platen surface along the entire width of the image receptor image-forming material, the device for holding the top end side being a pin bar having pins protruded from an inside of a blanket in a slope portion continued from a partial cut-off portion formed in the platen the device for holding the top end side comprising a pin bar located between a blanket and a slope portion continued from a partial cut-off portion formed in the platen, the pin bar having pins protruding through the blanket.
2. An image transfer apparatus according to
3. An image transfer apparatus according to
at least one means for peeling off the protection film is provided in a place in the platen corresponding to a place near a top end side of the image-forming material, and the means for peeling off the protection film is provided with an adhesive tape in a hole made in the blanket and in a position inside a blanket surface.
5. The image transfer apparatus of
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The present invention relates to an image transfer apparatus. More specifically, it relates to an image transfer apparatus having a platen equipped with an image-forming material attaching device for improving the registering accuracy and stabilizing the registering, and a transfer cylinder. Further, it relates to an image transfer apparatus having a platen equipped with a means for facilitating the peeling of a protection film from an image-forming material formed of a substrate, a photosensitive layer and the protection film while the image-forming material is attached to the platen, and a transfer cylinder.
A single-color or multi-color prepress proof suitable for proof printing, etch, is recently increasingly produced. The prepress proof is produced by imagewise exposing an image-forming material comprising a substrate and photosensitive layer formed on one surface of the substrate and then transferring an image to an image receptor such as paper under heat, generally around 100°C The image-forming material is formed of a substrate, a photosensitive layer formed on one surface of said substrate and a protection film. As the substrate and the protection film, a thin film or sheet formed from a material such as cellulose acetate, polystyrene, polyvinyl chloride or polyethylene terephthalate is used. As the image receptor, a properly selected printing sheet such as paper or a film is used.
As an apparatus for preparing the above prepress proof, generally, there has been proposed an image-transfer apparatus having a platen to which an image-forming material is to be attached and a transfer cylinder to which an image receptor is to be attached, and the platen and the transfer cylinder are brought into contact so that a photosensitive layer of the image-forming material and an image receptor are brought into contact with each other under pressure to transfer an image formed on the photosensitive layer to the image receptor in a nip portion formed by the platen and the transfer cylinder. A multi-color image transfer product or a prepress proof sheet is produced by color-scanning an original of multi-color image, imagewise exposing image-forming materials corresponding to separated colors, e.g., yellow, magenta, cyan and black to form images of these colors in the image forming materials, and consecutively transferring these formed images to one image receptor.
As a device for attaching the image-forming material to the platen, a pin bar is generally used to facilitate the registering of each color. The pin bar has a structure in which a plurality of pins are provided on a plate extending in the axial-length direction of the platen. When, however, the pin bar is directly provided on the platen, there is caused a distinct height difference between the platen surface and the pin bar, and the image-forming material which has been attached has a nonuniform slackening. Therefore, the registering accuracy is insufficient in many cases. There is further another problem in that the area on which the printing can be actually effected is decreased since the printing with sufficient registering accuracy cannot be carried out on the pin bar portion.
For producing a multi-color prepress proof, a plurality of image-forming materials and one image receptor are used. After the imagewise exposure, each image-forming material is attached to the platen in a state in which the protection film is stacked. On the platen, the protection film is manually peeled off by an operator. However, it is difficult to peel off the thin protection film, and the peeling off the thin protection film extremely impairs the workability. Further, when the protection film is peeled off, an unexposed portion, i.e., an image portion, is sometimes peeled together, and in such a case, no aesthetically fine image transfer product can be obtained.
It has been strongly desired to develop a device for attaching a sheet-like substance such as an image-forming material without causing a failure in registering and a device with which the protection film of the image-forming material can be easily peeled off. However, no device which satisfies the above desire has been developed.
It is therefore an object of the present invention to provide an image transfer apparatus having a device with which the image-forming material can be attached to the platen without causing a failure in registering. It is further another object of the present invention to provide an image transfer apparatus having a platen equipped with a device for easily peeling off the protection film of the image-forming material and a transfer cylinder.
The present invention provides an image transfer apparatus, which comprises a platen to which an image-forming material is to be attached and a transfer cylinder to which an image receptor is to be attached, and which is for transferring an image formed in a photosensitive layer of an image-forming material to an image receptor by the introduction of the image-forming material and the image receptor into a nip formed by the platen and the transfer cylinder by the rotation of the platen and the transfer cylinder,
the apparatus having an image-forming material attaching device comprising a device for holding the top end side of the 16 19 for peeling off the protection film is provided near the top end side of the image-forming material (not shown) attached to the platen 8. In the means 16 19 for peeling off the protection film, a hole is made in a predetermined place in the blanket 10 as shown in FIG. 5, and a means for sticking to the substrate of the image-forming material, such as an adhesive tape 20, is provided in the hole. For properly maintaining the height difference between the upper level of the blanket 10 and the sticking means, a projection portion 21 may be provided within the hole of the blanket, and the adhesive tape 20 may be attached to the upper surface of the projection portion. The blanket is formed of a laminate prepared by stacking rubber layer(s), and cloth layer(s) and it is selected by taking elasticity and restorability into consideration.
The function of the device for attaching the image-forming material, used in the present invention, will be explained hereinafter. The pin bar is fixed to the platen surface by means of the blanket, etc., and it can be therefore easily attached and detached. Further, there is caused no distinct height difference between the pin bar and the platen surface, and the image-forming material can be therefore attached to the platen with good registering accuracy. The positioning is accurately carried out by fitting the image-forming material having holes in positions corresponding to the pin bar 13 to the pin bar, then the platen 8 is rotated, and the image-forming material is attached to the platen surface by means of the top end side adhesive tape and the bottom end side adhesive tape. Thereafter, the image-forming material is pressed to the means 19 for peeling off the protection film to make the substrate stick to the adhesive tape 20, whereby the protection film is freed from the photosensitive layer formed on the substrate due to the height difference between the surface of the adhesive tape 20 and the surface of the blanket 10. The protection film can be easily peeled off by pulling the protection film.
According to the present invention, there is provided an image transfer apparatus which permits the facile attaching and detaching of the pin bar and which gives a multi-color prepress proof or an image transfer product. According to the present invention, further, there is provided an image transfer apparatus which shows an improvement in workability in facile removal of the protection film from the image-forming material and which gives an aesthetically fine prepress proof or an image transfer product without causing the peeling of an unexposed portion, i.e., an image portion.
Matsuo, Masaaki, Kimura, Takayuki
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