JPH0527448A - Image transfer device with movable ironing roller - Google Patents

Abstract

PURPOSE:To attach a soft sheet-like material such as an image forming material without having winkles, sagging, etc., with a simple means and further, to facilitate attachment/detachment by providing an elastic pressure member between an ironing roller and a swinging arm. CONSTITUTION:A roller shaft 9 extending from the side part of the ironing roller 8, passes through an oblong hole 11 provided on the end part of the swinging arm 10. The other end of the swing arm 10 is pivotally attached to the swinging arm 13 pivotally supported by the frame 12 of an image transfer device. The swinging arm shaft 13 is pivotally supported by a guiding rail supporting member 25 attached to the frame 12 at a position having eccentricity from the central shaft of a pressure drum 1, and the ironing roller 8 can move between a contact position with the surface of the pressure drum and a noncontact position, by the rotation of the swinging arm shaft 13. The elastic member 15 whose one end is stop-fitted to the swinging arm 10, is attached to the roller shaft 9 of the ironing roller 8, and the contact pressure of the ironing roller 8 and the surface of the pressure drum is adjusted by the elastic member 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image transfer device.
More specifically, the present invention relates to an image transfer apparatus equipped with an image forming material affixing device that prevents wrinkles and the like from being generated when an image forming material is affixed to an impression cylinder and does not cause misregistration due to the image forming material.

[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 imagewise exposed, 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.

When the photosensitive layer of the image-forming material is pressed onto an image receptor such as paper to transfer the image formed on the photosensitive layer onto the paper, four colors are printed in the case of four-color printing on one sheet of paper. The images will be superimposed and transferred. In this case, if wrinkles or the like occur when the image forming material is attached to the impression cylinder, misalignment occurs in the images of the second and subsequent colors that are overprinted, and it is not possible to obtain a beautiful printed matter suitable for the purpose of proof printing.

The image-forming material used in the present invention comprises 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, polyethylene terephthalate is used. Since the support and the protective film are made of such a soft material, they have the property that wrinkles, sagging, etc. are likely to occur when they are attached to the impression cylinder.

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 an apparatus, the development of an apparatus for easily attaching a soft sheet-like material such as an image forming material to a rotating object such as an impression cylinder and a transfer cylinder in a state with excellent registration accuracy without causing wrinkles, sagging, etc. Has been strongly sought after, but a device satisfying such a demand has not yet been developed.

[0006]

SUMMARY OF THE INVENTION The present invention provides a simple means for an image transfer apparatus such as an apparatus for producing a prepress proof without causing wrinkles, sagging or the like of a soft sheet material such as an image forming material. It is an object of the present invention to provide an image transfer device that can be easily attached and detached with a sheet-like object.

[0007]

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 an image forming member formed on a photosensitive layer of the image forming material is provided with an impression cylinder. In the device for transferring to the image receptor at the nip between the transfer drum and the transfer cylinder, the transfer device comprises an ironing roller for bringing the image forming material into close contact with the surface of the impression cylinder, and the ironing roller comprises:
A roller shaft extending to both sides of the ironing roller, and a swing arm having the roller shaft fitted in a long hole,
The swing arm is attached to a swing arm shaft rotatably supported by a frame of the transfer device at a position eccentric from the center of the impression cylinder, and the ironing roller is provided with an elastic member provided between the roller shaft and the swing arm. It is adapted to be attracted to the impression cylinder surface side via a member, and the squeezing roller is movable by rotating the swing arm between a contact position and a non-contact position on the impression cylinder surface. Provided is an image transfer device with a roller.

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

FIG. 1 is an explanatory view of an image transfer device having a movable ironing roller according to the present invention. An image forming material and an image receptor (not shown) are attached to the impression cylinder 1 and the transfer cylinder 2, respectively, rotated in the direction of the arrow, and imagewise formed on the photosensitive layer of the image forming material at the nip between the cylinders. The transferred image is transferred to the image receptor by pressure bonding. A sheet receiving stand 4 and a magnet sheet 5 provided in the notch 3 of the impression cylinder 1
The upper side of the image forming material is sandwiched between them, and then the impression cylinder 1 is rotated to attach the lower side of the image forming material to the adhesive tape 6 to attach the image forming material to the impression cylinder 1. The image receptor is attached to the transfer cylinder 2 by the clamp 7. Any appropriate means can be adopted as the means for attaching the image forming material and the image receptor. Since the image forming material is made of a soft material, wrinkles, slack and the like are likely to occur between the upper side attachment of the image forming material and the lower side attachment. In order to prevent such wrinkles and sagging, the upper side of the image forming material is attached, and then the impression cylinder 1 is rotated while the image forming material is brought into close contact with the impression cylinder surface by the ironing roller 8, and then the image forming material is formed. The method of sticking the lower side of the lower part to the impression cylinder has been proposed in the past. The present invention discloses a movable ironing roller which is easy to handle and has an excellent ironing effect. The ironing roller is preferably coated with a heat resistant resin such as silicone rubber and has an appropriate frictional force between the ironing roller and the image forming material.

FIG. 2 is a partial cross-sectional view showing a specific structure of the ironing roller of the present invention, and FIG. 3 is a partial front view of an image transfer device including the ironing roller of the present invention. A roller shaft 9 extending from the side of the ironing roller 8 is fitted in a long hole 11 provided at the end of the swing arm 10. The other end of the swing arm 10 is pivotally attached to a swing arm shaft 13 which is pivotally supported by a frame 12 of the image transfer device. The swing arm shaft 13 is pivotally supported by a guide rail support member 25 attached to the frame 12 at a position eccentric from the central axis of the impression cylinder 1, and by the rotation of the swing arm shaft 13, the ironing roller 8 is moved to the surface of the impression cylinder. The contact position and the non-contact position can be moved. The ironing roller 8 in the non-contact position is shown by the broken line in FIG. The elastic member 15 having one end fixed to the swing arm 10 is attached to the roller shaft 9 of the ironing roller 8. With this elastic member, the contact pressure between the ironing roller 8 and the surface of the impression cylinder is adjusted.

The guide rail 16 is arranged so as to come into contact with the guide roller 14 attached to the tip of the roller shaft 9 when the ironing roller 8 is in a position where it comes into contact with the surface of the impression cylinder. The guide rail 16 prevents the ironing roller 8 from moving with the rotation of the impression cylinder when the ironing roller 8 contacts and rotates with the impression cylinder surface.

The swing arm 10 can be rotated manually or electrically. 2 and 3, the case of electric driving is shown. A pulley 2 attached to a swing arm shaft 13 and attached to a swing arm operation shaft 19 driven by the pulley 17 and a motor 18.
A belt 21 is connected between 0 and. The swing arm operating shafts are supported by the front and back frames 12 of the impression cylinder. As a result, the front and back swing arms 10 are operated simultaneously.

Further, as shown in FIG. 2, a cover 22 is provided on the ironing roller 8, and a movable cover 24 provided at the tip of the main body exterior cover 23 is rotated by the rotation of the cover 22 in accordance with the rotation of the ironing roller 8. It is preferable to open and close the movable cover 24 from the viewpoint of safety.

The operation of the image transfer device with the movable ironing roller of the present invention will be described below. After the upper side of the image forming material is held by the impression cylinder with the magnet sheet 5, the squeezing roller 8 drives the swing arm shaft 13 to rotate toward the guide rail 16. The guide roller 14 provided at the tip of the roller shaft 9 moves along the guide rail 16, and the squeezing roller 8 contacts the surface of the impression cylinder at the cut portion of the guide rail. The contact pressure between the ironing roller 8 and the surface of the impression cylinder is adjusted by the elastic member 15. Since the adjustment of the contact pressure has a great influence on the generation of wrinkles, sagging, etc. in the image forming material, it is necessary to adjust it appropriately by the elastic member.

After bringing the ironing roller 8 into contact with the impression cylinder,
The impression cylinder 1 is rotated, and the ironing roller is also rotated as the impression cylinder rotates, so that the image forming material is brought into close contact with the surface of the impression cylinder by the rotation. Then, the lower side of the image forming material is attached to the adhesive tape 6.

[0016]

According to the present invention, there is provided an image transfer device with a movable ironing roller which can easily eliminate the cause of misregistration such as wrinkles of the image forming material. Further, according to the present invention, there is provided an image transfer device with a movable ironing roller, which is capable of adhering the image forming material to the surface of the impression cylinder by a simple operation. Further, when the ironing roller is not used, the ironing roller is housed in the outer cover, which is preferable in terms of workability.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an image transfer device.

FIG. 2 is a partially enlarged schematic sectional view of an image transfer device.

FIG. 3 is a partial front view of the image transfer device.

[Explanation of symbols]

1 impression cylinder 2 transfer cylinder 8 Ironing roller 10 swing arm 14 Guide roller 15 Elastic member 16 Guide rail

Claims (3)

[Claims] 1. A nip between an impression cylinder and a transfer cylinder, comprising an impression cylinder to which an image forming material is attached and a transfer cylinder to which an image receptor is attached, the image being formed on a photosensitive layer of the image forming material. In the device for transferring to the image receptor, the transfer device comprises an ironing roller for bringing the image forming material into close contact with the surface of the impression cylinder, and the ironing roller has roller shafts extending on both sides of the ironing roller and the roller shaft. A swing arm having a roller shaft fitted in the elongated hole is attached to the swing arm shaft rotatably supported by the frame of the transfer device at a position eccentric from the center of the impression cylinder. The roller is adapted to be attracted to the surface of the impression cylinder via an elastic member provided between the roller shaft and the swing arm, and the ironing roller is rotated by the swing arm to move the impression cylinder surface. Contact position and the movable roller with the image transfer device, characterized in that the pivot between the non-contact position to. 2. The image transfer apparatus according to claim 1,
With a movable roller characterized in that a guide rail that prevents the ironing roller from moving with the rotation of the impression cylinder was installed near the surface of the impression cylinder so as to contact the guide roller provided at the tip of the roller shaft. Image transfer device. 3. The image transfer device according to claim 1,
The tip side of the outer cover on the impression cylinder side is a movable cover,
An image transfer device with a movable roller, wherein the movable cover is opened and closed by rotation of an ironing roller.