JP2970208B2 - Attachment device for image receptor - 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 receiving device. More particularly, the present invention relates to an image receptor attaching device capable of holding an image receptor with a uniform pressure even when a transfer cylinder to which the image receptor is attached is heated.

[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. An image receptor such as paper is heated in advance, and the image formed on the photosensitive layer is transferred to paper by pressing the photosensitive layer of the image forming material onto the paper, and the image transfer proceeds smoothly. A beautiful print can be obtained. For this reason, it is usual to provide a heating means inside the transfer cylinder to which the image receptor is attached, which can appropriately heat the surface of the transfer cylinder to, for example, about 100 ° C.

As an image receptor attaching device, a clamp composed of a claw and a claw seat extended in the lengthwise direction of the transfer cylinder is installed in a partially cutout portion of the surface of the transfer cylinder, and the clamp is used to attach the image receptor. Gripping devices have been used in the past.
The clamp is typically made of metal to provide a sufficiently large pressure between the pawl and the pawl seat. For this reason, the heat of the heated transfer cylinder is also transmitted to the clamp, and the curvature of the claw and the claw seat progresses during use, which often makes it difficult to grip the image receptor with uniform pressure. Since the image receptor itself is also a paper or the like that easily generates curl or the like due to heat, when the image receptor is inserted into a narrow gap provided between the nail and the nail seat, the curvature of the nail and the nail seat may be changed. In some cases, improper attachment of the body, for example, double folding of the paper in the clamp or the like may occur.

[0005] As an image receptor adhering device in a transfer cylinder, an image receptor capable of easily attaching and detaching a soft sheet-like material such as a conventional image receptor and holding the image receptor without causing a defective mounting or the like. While there has been a strong need for the development of holding devices, no device has been developed that satisfies such a need.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an image transfer apparatus such as an apparatus for producing a prepress proof, in which a soft sheet-like material such as an image receptor is attached, easily detached, and uniform during use. It is an object of the present invention to provide an image transfer device including an image receptor attaching device capable of holding an image receptor by pressure.

[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 the image forming material and image receptor are rotated by rotating the impression cylinder and the transfer cylinder. Is introduced into the nip between the impression cylinder and the transfer cylinder to transfer the image formed on the photosensitive layer of the forming material to the image receptor. A claw and a claw seat for holding the lower side and the lower side on the surface of the transfer cylinder over the entire area in the width direction, respectively. A nail and a claw seat for gripping the image receptor provided in the direction, the claw and the claw seat are composed of at least two claws divided in the axial direction, and a gap is provided between the claw seats in the axial direction. To provide an attachment device for an image receptor characterized by the presence of That.

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 device including an impression cylinder including an image attachment device of the present invention for applying an image forming material and a transfer cylinder for attaching an image receptor such as paper. FIG. 2 is a schematic perspective view of the image receptor attaching device.

The configuration of the image transfer apparatus used in the present invention will be described below 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 including a nail 5 and a nail 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.

An example of the configuration 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. Pin bar 13
Has a height such that its tip does not protrude outside the circumferential surface of the impression cylinder 8. When the impression cylinder 8 and the transfer cylinder 1 rotate, the pin bar 1
3 or the surface of the transfer cylinder 1 is not damaged. The magnet sheet 14 is rotatably mounted in the partially cutout portion 9. Inclined part 1 with pin bar 13 on impression cylinder surface
An adhesive tape 15 is provided on the surface of the impression cylinder in the vicinity of 2 and in the vicinity of the other inclined portion of the notch 9. Magnet sheet 14
Has a width that does not reach the adhesive tape 15 when it is tilted in the direction opposite to the arrow but is large enough 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 magnet sheet 14
To suppress the image forming material, and then rotate the impression cylinder 8 in the direction of the arrow so that the upper and lower sides of the image forming material
To fix to the impression cylinder surface.

It is preferable that a tray is provided above the transfer cylinder 1 and the impression cylinder 8 so that the tip portions 17 and 18 of the tray can be brought close to the transfer cylinder surface and the impression cylinder surface by rotating about the fulcrum 16. . An image receptor or image forming material is placed on the tray to facilitate the mounting or discharging operation of the image receptor or image forming material. An ironing roller 19 that can freely contact the surface of the transfer cylinder 1 and an ironing roller 20 that can freely contact the surface of the impression cylinder 8 may be provided. The ironing roller 19 is effective in that when the image receptor is attached to the transfer cylinder, the image receptor is brought into close contact with the surface of the transfer cylinder, and wrinkles and slack of the image receptor are eliminated. The ironing roller 20 also has the same function and effect as described above when the image forming material is mounted on the impression cylinder.

FIG. 2 is a partially enlarged view of the upper side image receptor attaching device including the gripper 3 and the gripper seat 4. The claw seat 4 is divided into a plurality of pieces in the axial length direction of the transfer cylinder 1, and a gap is provided between each claw seat. This gap allows
Prevents the claw seat from bending due to thermal expansion and contraction. The claw 3 is also divided into a plurality of pieces in the axial length direction of the transfer cylinder 1, and a gap is provided between each claw. This gap prevents the nail from bending due to heat. The pawls 3 are simultaneously driven by a drive shaft 7 penetrating each pawl. In the vicinity of the drive shaft side of the pawl 3, a mounting angle adjusting bolt 21 for the pawl screwed to the pawl 3 is provided, the mounting angle of the pawl 3 to the drive shaft 7 is adjusted for each pawl, and the image receptor by the pawl is adjusted. Preferably, the gripping pressure can be adjusted individually. The claw 5 and the claw seat 6 of the lower side image receptor attaching device may have the same structure as the upper side attaching device. Further, preferably, a plurality of image receptor detection sensors 22 may be provided on the side claw seat 4. This is for confirming the insertion length of the image receptor in the clamp.

The operation of the image transfer device including the image attachment device of the present invention will be described below. An image receiver (not shown) is gripped on the upper side by a clamp comprising a claw 3 and a claw seat 4 provided in a partially cutout portion 2 of the transfer cylinder 1, and then the transfer cylinder is rotated in the direction of an arrow. The lower side is gripped by a clamp including a claw 5 and a claw seat 6 and attached to the transfer cylinder 1. The pawls 3 and 5 are operated by a drive shaft 7. Transfer cylinder 1
In order to heat the image receptor before the image transfer operation, a heating means 23 is provided inside the transfer cylinder so that the surface temperature becomes around 100 ° C. For this reason, the nail and the claw seat are bent due to heat, curl, wrinkles, and the like are generated when the image receptor is inserted into the clamp.

Therefore, in the present invention, as shown in FIG. 2, a plurality of pawl seats 4 are provided with a gap in the axial direction of the transfer cylinder 1. Further, a plurality of claws 3 are also provided by dividing in the axial direction. Thereby, the curving of the nail and the nail seat due to heat can be prevented, and the image receptor can be always gripped with a uniform pressure. Further, it is possible to prevent the image receptor from being attached incorrectly due to the curvature of the nail and the nail seat. Claw 5 and claw seat 6 also have claw 3
And the same structure as the claw seat 5. The plurality of claws 3 divided in the axial direction of the transfer cylinder 1 are provided with a drive shaft 7 that penetrates each of the claws, so that the claws can be driven simultaneously. Accordingly, even if the claws are divided, each of the claws can be driven at the same time, so that the mounting operation of the image receptor is simple.

After the gripping side of the image receptor is gripped by the clamp, the transfer cylinder is rotated in the direction of the arrow, preferably while the image receptor is brought into close contact with the surface of the transfer cylinder by an ironing roller 19, and the image is clamped by the clamp on the rear end side. Hold the receptor. A sensor for detecting an image receptor may be provided on the claw seat 6 on the side of the hip. A positioning stopper 24 may be provided between the divided claws 3. The stopper is effective in facilitating the setting of the insertion distance of the image receptor into the nail 3.

In the image transfer, an image receptor attached to a transfer cylinder and an image forming material attached to an impression cylinder are introduced into a nip between the two cylinders, and formed on a photosensitive layer of the image forming material. This is accomplished by crimping the existing image onto an image receptor.

[0017]

According to the present invention, the image receptor can be easily attached and detached and the clamp can be prevented from bending due to heat, so that the image receptor gripping force by the nail and the claw seat can be made uniform. The present invention provides an image receptor attaching device capable of securely holding an image receptor.

[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 upper side image receptor attaching device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transfer cylinder 3 Nail on the side 4 Nail base on the side 5 Nail on the side of the lip 6 Nail base on the side of the lip 7 Drive shaft 8 Impression cylinder

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B41F 21/05 G03F 3/10 B41M 5/26 B41F 16/00 B41J 13/22

Claims (3)

(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. In an apparatus for transferring an image formed on a photosensitive layer of the forming material to an image receiving member by introducing the image forming member into a nip between the image receiving member, an adhering device of the image receiving member covers an upper side and a lower side of the image receiving member over the entire width direction, respectively. An image comprising a claw and a claw seat for holding the transfer drum surface, wherein the upper side attachment device is provided in a notch provided in a part of the transfer drum surface in an axial direction of the transfer drum. A nail for holding the receptor and a claw seat, wherein the claw and the claw seat are formed of at least two claws divided in the axial direction, and a gap is present between the claw seats in the axial direction. An image receiving device attachment device. 2. The image receiving device as claimed in claim 1, wherein the divided claws are simultaneously driven by a driving shaft penetrating the claws. 3. The image forming apparatus according to claim 1, wherein the lower side adhering device includes an image receptor gripping claw and a claw seat provided in a notch portion provided in a part of the transfer cylinder surface in the axial direction of the transfer cylinder. 2. The image receiving device as claimed in claim 1, wherein the claw seat includes at least two claws divided in the axial direction, and a gap exists between the claw seats in the axial direction.