JP2970279B2 - Image transfer device with tray - 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, the present invention relates to an image transfer apparatus provided with a tray having excellent heat insulation and capable of tilting toward an impression cylinder or a transfer cylinder on which an image receptor or an image forming material is placed.

[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 the image formed on the photosensitive layer is heated, generally at about 80 to 150.degree. As a result, mono- or multi-color prepress proofs suitable for proof printing or the like transferred to an image receptor such as paper have come to be produced. The image forming material includes a support, a photosensitive layer formed on one surface of the support, and a protective film. The support and the protective film are cellulose acetate,
Thin films or sheets made of materials such as polystyrene, polyvinyl chloride, polyethylene terephthalate are 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. For this reason, in order to facilitate attachment and detachment operations of the image receptor and the image forming material,
The applicant of the present invention has proposed an image transfer apparatus provided with a tiltable image receptor or a tray for mounting image forming material on the impression cylinder side or the transfer cylinder side (Japanese Patent Application No. 3-206517).
As a result of further studies, the surface temperature of the transfer cylinder to which the image receptor was attached was heated to 80 to 150 ° C., so that the mounting tray was also heated by receiving the residual heat. Has been found to be a major obstacle.

[0005]

The present invention makes it easy to attach an image receptor or an image forming material to an impression cylinder or a transfer cylinder,
Although there has been a strong demand for the development of a device having no problem in safety, a device satisfying such a demand 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. For transferring an image formed on the photosensitive layer of the forming material to an image receiving member by introducing the toner into a nip between the impression cylinder and the transfer cylinder, the apparatus comprising: A metal support plate having a fulcrum with a tip portion approaching the impression cylinder side or the transfer cylinder side around the fulcrum, and a heat insulating member partially provided on the support plate. An image transfer device comprising an image forming material or a synthetic resin mounting plate for an image receptor.

Further, the present invention provides the above-described image transfer apparatus, wherein the transfer apparatus has an outer cover, and the outer cover is separated into an impression cylinder-side outer cover and a transfer cylinder-side outer cover at an upper part of the transfer apparatus. Provided is an image transfer device, wherein the inclination angle of the transfer cylinder side outer cover on the tray side is set to be substantially the same as the inclination angle of the tray when the image forming material is mounted.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional view of the image transfer device of the present invention when the tray is inclined toward the impression cylinder.

The impression cylinder 1 is provided with an image forming material attaching means. Various means such as a clamp, an adhesive tape, and a pin bar can be employed as the attaching means. In FIG. 1, a sheet receiving base 3 is installed in a notch 2 of an impression cylinder 1,
An example in which the upper side of the image forming material is held by the sheet receiving base 3 and the magnet sheet 4 and the lower side of the image forming material is held by the adhesive tape 5 is shown. The transfer cylinder 7 is provided with means for attaching an image receptor. In the example shown in FIG. 1, a clamp 9 is provided in the cutout 8 of the transfer cylinder, and the clamp holds the image receptor. The impression cylinder 1 is provided with another notch 10 so that when the impression cylinder and the transfer cylinder rotate in contact with each other, the surface of the transfer cylinder or the impression cylinder is not damaged by the image forming material attaching means or the image receptor attaching means. It is preferable to keep it.

The tray 11 is installed so as to be rotatable around a fulcrum 12 provided near the center of the tray.
The tip of the tray is located near the surface of the impression cylinder 1 or the transfer cylinder 7.
To the vicinity of the surface of. The rotation of the tray 11 may be performed by any means such as electric operation and manual operation. Impression cylinder 1
Further, exterior covers 13 and 14 are provided above the transfer cylinder 7. The tray side of the exterior cover 13 installed on the transfer cylinder side is inclined so as to be almost the same as the tray when the tip of the tray 11 is inclined until reaching the vicinity of the impression cylinder surface. Rolling means such as rollers 16 are provided on both sides of both ends of the tray, and the impression cylinder 1 or the transfer cylinder 7 is provided.
It is preferable that the tip of the tray does not damage the surface of the impression cylinder or transfer cylinder, or the surface of the image forming material or the image receptor when the is rotated. Further, the tray may be configured such that the transfer cylinder side with respect to the fulcrum 12 can be bent by a pin joint or the like. This is to facilitate the work of removing the image receptor from the transfer cylinder.

An outer cover 13 provided above the transfer cylinder 7
It is desirable that the tray side has a three-layer structure (not shown) in which a heat insulating layer is provided in a central layer. When an image formed on the photosensitive layer of the image forming material by image exposure is transferred to an image receptor, generally, the transfer cylinder 7 is heated so that the image transfer to the image receptor is facilitated. . At this time, the tray side of the exterior cover 13 is heated by radiant heat. Since the image forming material uses a thin film as a support, curling or the like is likely to occur at a high temperature. It is not preferable that the temperature of the outer cover 13 rises from the viewpoint of safety during operation. The heat insulating layer is made of a heat insulating material such as glass wool and air.

An ironing roller 15 is provided at a position distant from the surface of the impression cylinder 1, and the ironing roller 15 is installed so as to move and contact the surface of the impression cylinder near the tip of the tray 11 when the image forming material is mounted. . The ironing roller 15 is preferably provided with a safety cover 17.

It is preferable that a part 18 of the exterior cover 14 on the impression cylinder 1 side on the tray 11 side be movable by means such as a pin joint 19. Part 18 of the outer cover 14 is
When the ironing roller 15 moves to the vicinity of the leading end of the tray 11, it is pushed up by the roller, and when the roller returns to its original position, it falls by its own weight and is positioned vertically.

FIG. 2 is an explanatory view showing the structure of the tray of the present invention. The tray 11 is provided with a mounting plate 22 made of synthetic resin via a heat insulating member 21 partially installed on a metal support plate 20. The reason why the supporting plate is made of metal is to maintain sufficient rigidity as a tray. The mounting plate is made of synthetic resin in order to make the perceived temperature lower even at the same temperature.

The operation of the image transfer device with a tray according to the present invention will be described below. By rotating the impression cylinder 1, the sheet receiving base 3, which is the upper side attaching means of the image forming material, is positioned at the upper part. Next, the tray 11 is inclined toward the impression cylinder, and an image forming material (not shown) is placed on the tray and the outer cover 13. The upper side of the placed image forming material is placed at a predetermined position on the sheet receiving table 3, and is held by the magnet sheet 4. The width of the magnet sheet 4 preferably covers both the sheet receiving table and the surface of the impression cylinder near the tip of the tray 11. This is to prevent the occurrence of wrinkles or the like due to the notch 3 or the like of the image forming material. Since the image forming material is formed of a soft material, and in order to adjust the registration accuracy, the tray 11 and the outer cover 1 are used.
Placing the image forming material on 3 is very excellent in terms of convenience of operation.

After holding the image forming material, the ironing roller 15 is moved to contact the magnet sheet 4 on the surface of the impression cylinder, and an appropriately selected pressure is applied. Next, the impression cylinder 1 is rotated in the direction of the arrow while the image forming material is brought into close contact with the surface of the impression cylinder with the ironing roller 15, and the lower side of the image forming material is set on the impression cylinder surface near the other cutout 10. Fix with 5. After fixing the lower side of the image forming material, the ironing roller 15 is returned to the original position. For the movement of the ironing roller 15, any means such as electric operation and manual operation can be appropriately adopted. When the ironing roller 15 returns, the part 18 of the exterior cover 14 also returns to the vertical position.

After the image forming material has been applied to the impression cylinder, the tray 11 is inclined toward the transfer cylinder 7, and the tip of the tray is positioned near the surface of the transfer cylinder. The upper side of the image receiver, for example, paper placed on the tray 11 is gripped by the clamp 9 installed in the cutout 8 of the transfer cylinder 7. Then, the transfer cylinder 7 is rotated in the direction of the arrow while keeping the paper in close contact with the surface of the transfer cylinder, and the lower side of the paper is gripped by another clamp 9.

The image forming material is laminated in the order of a support, a photosensitive layer and a protective film, and the impression cylinder is made by adhering either the image forming material from which the protective film has been peeled off or the image forming material with a protective film. Is also good. In the case of an image forming material having a protective film, an operation of once attaching the image forming material to the impression cylinder and then removing the protective film is required. The image formed on the photosensitive layer by image exposure is transferred to the paper by pressing the image forming material from which the protective film has been peeled off onto the paper at the nip between the impression cylinder and the transfer cylinder. In multi-color prepress proofs, etc.,
In order to transfer the image formed on the image forming material of each color to one sheet of paper, the operation of attaching the image forming material to the impression cylinder is repeated for each color.

[0019]

According to the present invention, by providing a rotatable tray in an image transfer apparatus, an image transfer material and an image receptor can be stuck to the image forming material and the image receptor by an easy operation without causing wrinkles and misregistration. An apparatus is provided. Further, according to the present invention, there is provided an image transfer apparatus in which a rotating object such as an impression cylinder and a transfer cylinder is covered with an outer cover and a tray, thereby preventing occurrence of a disaster due to an operation error or the like.

[Brief description of the drawings]

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

FIG. 2 is an explanatory view showing the structure of the tray of the present invention. REFERENCE SIGNS LIST 1 impression cylinder 7 transfer cylinder 11 tray 13 transfer cylinder side exterior cover 14 impression cylinder side exterior cover 15 ironing roller 16 roller 17 safety cover 18 movable part of exterior cover

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Claims (2)

(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 the photosensitive layer of the forming material to an image receiver by introducing the image formed on the photosensitive layer of the forming material into an intermediate nip. Has a tray accessible to the impression cylinder side or the transfer cylinder side, the tray having a fulcrum and a metal supporting plate, and an image forming material or an image receiving member via an insulating member partially provided on the supporting plate. An image transfer device with a tray, comprising: a mounting plate made of synthetic resin. 2. The image transfer device according to claim 1, wherein
The transfer device is provided with an outer cover, and the outer cover is separated into an impression cylinder-side outer cover and a transfer cylinder-side outer cover at an upper portion of the transfer device, and the inclination angle of the transfer cylinder-side outer cover on the tray side is used for image formation. An image transfer device with a tray, wherein the inclination angle of the tray when the material is mounted is set to be substantially the same.