JPH05286109A - Image receptor-attaching device - Google Patents

Abstract

PURPOSE:To provide an image transfer apparatus having an image receptor- attaching device which can hold an image receptor being a soft sheet material by uniform pressure during the use of the receptor. CONSTITUTION:An image transfer apparatus has an impression cylinder with an image-forming material attached thereto and a transfer cylinder with an image receptor attached thereto. The transfer cylinder 1 is heated for smoothing the transfer of an image. The heat deformation of an image receptor-attaching device by heating of the transfer cylinder is prevented by the division of a pawl 3 and pawl seat 4 in the longitudinal direction of the axis of the transfer cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image receptor attachment device. More specifically, the present invention relates to an image receptor attachment device capable of gripping an image receptor with a uniform pressure even when the 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 surface of a support is imagewise exposed, and then the image formed on the photosensitive layer is heated, generally at about 100 ° C., BACKGROUND ART Single-color or multi-color prepress proofs suitable for proof printing to be transferred to an image receptor such as paper have come to be produced. The image forming material comprises a support, a photosensitive layer formed on one surface of the support, and a 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 support and the protective film. As the image receptor, an appropriately selected printing material such as paper or film is adopted.

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 such 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 contact-pressed with each other to transfer the image formed on the photosensitive layer to an image receptor at a nip between the cylinders. When an image receptor such as paper is heated in advance and the photosensitive layer of the above-mentioned image forming material is pressure-bonded to the image receptor to transfer the image formed on the photosensitive layer to the paper, the image transfer proceeds smoothly. You can get beautiful printed materials. 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 the image receptor attachment device, a clamp consisting of a nail and a nail seat extending in the axial direction of the transfer drum is installed in a cutout part of the transfer drum surface, and the image receptor is attached by the clamp. Gripping devices have been used in the past.
The clamp is usually made of metal so that the pressure between the claw and the claw seat is sufficiently large. For this reason, the heat of the heated transfer cylinder is also transmitted to the clamps, the bending of the nails and the nail seats progresses during use, and it is often difficult to grip the image receptor with uniform pressure. Since the image receptor itself is paper or the like that is easily curled by heat, when the image receptor is inserted into the narrow gap provided between the nail and the nail seat, the curvature of the nail and nail seat causes There was also a case where the body was not properly attached, for example, double-folded paper in the clamp.

As an image receptor attachment device in a transfer cylinder, an image receptor that can easily attach and detach a soft sheet-like material such as the conventional image receptor and can grip the image receptor without causing defective attachment or the like. Although there has been a strong demand for development of a holding device, a device satisfying such a demand has not yet been developed.

[0006]

SUMMARY OF THE INVENTION The present invention is an image transfer apparatus such as an apparatus for producing a prepress proof, in which a soft sheet-like object such as an image receptor can be easily attached and detached, and is uniform during use. An object of the present invention is to provide an image transfer device equipped with an image receptor attachment device capable of gripping an image receptor with 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 receiving member attached thereto, and the image forming material and the image receiving member are rotated by rotating the impression cylinder and the transfer receiving cylinder. In the apparatus for transferring the image formed on the photosensitive layer of the forming material to the image receptor by introducing the toner into the nip between the impression cylinder and the transfer cylinder, the attachment device of the image receptor is the upper side of the image receptor. And the lower side of the transfer drum surface are held on the transfer drum surface over the entire widthwise direction. Direction and a nail seat for grasping an image receptor, the nail and the nail seat are composed of at least two nails divided in the axial direction, and there is a gap in the axial direction between the nail seats. An image receptor attachment device characterized by the presence of That.

The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic cross-sectional view of an image transfer apparatus including an impression cylinder for adhering an image forming material including the image adhering device of the present invention and a transfer cylinder for adhering an image receptor such as paper. FIG. 2 is a schematic perspective view of the image receptor attachment device.

The structure of the image transfer device used in the present invention will be described below with reference to FIG. A partial cutout 2 is provided on the surface of the transfer cylinder 1, and a clamp including a nail 3 and a nail seat 4 which are upper side (holding side) attachment means of the image receptor is provided in the partial cutout, and a lower side ( (Grip end side) A clamp including the nail 5 and the nail seat 6 which are attachment means is installed. The claw 3 and the claw 5 are provided with a drive shaft 7 capable of driving the claw by a driving means such as manual or electric, and the claw 3 is opened and closed by the rotation of the drive shaft.

An example of 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 the blanket 10 wound around the surface of the impression cylinder 8 is fixed by the blanket fixing means 11 in the notch. An inclined portion 12 is provided between the partial cutout portion 9 and the impression cylinder surface (circumferential surface), and the pin bar 13 is installed on the inclined portion. Pin bar 13
Has a height such that its tip does not extend 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 9. Inclined portion 1 with pin bar 13 on the surface of the impression cylinder
The 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 partially cutout portion 9. Magnet sheet 14
Has a width sufficient to cover the pin bar 13 although it does not reach the adhesive tape 15 when it is tilted in the direction opposite to the arrow. 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 is formed.
The image forming material is suppressed by, and then the impression cylinder 8 is rotated in the direction of the arrow so that the upper side and the lower side of the image forming material are adhered to the adhesive tape 15.
And fix it to the surface of the impression cylinder.

It is preferable to install a tray above the transfer cylinder 1 and the impression cylinder 8 so that the tray tips 17 and 18 can respectively come close to the transfer cylinder surface and the impression cylinder surface by rotating around a fulcrum 16. .. The image receptor or the image forming material is placed on the tray to facilitate the work of mounting or discharging the image receptor or the image forming material. You may install the ironing roller 19 which can contact the surface of the transfer cylinder 1, and the ironing roller 20 which can contact the surface of the impression cylinder 8 freely. The ironing roller 19 is effective in adhering the image receptor to the surface of the transfer drum when attaching the image receptor to the transfer drum, and eliminating wrinkles, sagging and the like of the image receptor. The ironing roller 20 also exhibits the same operation and effect as the above when the image forming material is attached to the impression cylinder.

FIG. 2 is a partially enlarged view of the upper side image receptor attachment device including the gripper side nail 3 and the gripper side nail seat 4. The nail seat 4 is divided into a plurality in the axial direction of the transfer cylinder 1, and a gap is provided between the individual nail seats. Due to this gap,
Prevents bending of the nail seat due to thermal expansion and contraction. The claw 3 is also divided into a plurality of pieces in the axial direction of the transfer cylinder 1, and a gap is provided between the individual claws. This gap prevents the nail from bending due to heat. The claws 3 are simultaneously driven by a drive shaft 7 that penetrates each claw. Provided near the drive shaft side of the claw 3 is a bolt 21 for adjusting the mounting angle of the claw screwed to the claw 3 to adjust the mounting angle of the claw 3 to the drive shaft 7 for each claw, and to adjust the image receptor of the claw 3. It is preferable to be able to adjust the gripping pressure individually. The nails 5 and the nail seats 6 of the lower side image receptor attachment device may have the same structure as the upper side attachment device. Further, preferably, a plurality of detection sensors 22 for the image receptor may be provided on the grip side 4 on the grip side. This is to confirm 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 receptor (not shown) is clamped on the upper side by a clamp composed of 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 arrow direction. 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 the drive shaft 7. Transfer cylinder 1
In order to preheat the image receptor before the image transfer operation, a heating means 23 is provided inside the transfer cylinder so that the surface temperature is around 100 ° C. As a result, the nails and the nail seat are curved due to heat, curls and wrinkles are generated when the image receptor is inserted into the clamp, and the gripping pressure in the clamp is not uniform, and the image receptor is not easily attached.

Therefore, according to the present invention, as shown in FIG. 2, a plurality of nail seats 4 are provided with a gap in the axial direction of the transfer cylinder 1. Further, a plurality of claws 3 are also installed by dividing them in the axial direction. As a result, the bending of the nail and the nail seat due to heat can be prevented, and the image receptor can always be held with a uniform pressure. Furthermore, it is possible to prevent the image receptor from being improperly attached due to the curvature of the nail and the nail seat. The nail 5 and the nail seat 6 are also the nail 3
The same structure as that of the nail seat 5 may be used. The plurality of claws 3 divided in the axial direction of the transfer cylinder 1 are provided with a drive shaft 7 penetrating each claw so that the claws can be simultaneously driven. Accordingly, even if the nails are divided, the nails can be driven simultaneously, so that the mounting operation of the image receptor is simple.

After gripping the gripper side of the image receptor by the clamp, the transfer drum is rotated in the direction of the arrow while the image receptor is brought into close contact with the transfer cylinder surface, preferably by the ironing roller 19, and the image is clamped by the clamp on the gripper side. Grasp the receptor. An image receptor detecting sensor may also be installed on the grip side nail seat 6. 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 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 both cylinders to form a photosensitive layer of the image forming material. This is accomplished by crimping the existing image to the image receptor.

[0017]

According to the present invention, the image receptor can be easily attached and detached, and the bending of the clamp due to heat can be prevented, so that the image receptor gripping force by the nail and the nail seat can be made uniform. Provided is an image receptor attachment device capable of reliably gripping an image receptor.

[Brief description of drawings]

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

FIG. 2 is a schematic explanatory diagram of an upper side image receptor attachment device.

[Explanation of symbols]

 1 transfer cylinder 3 gripper side nail 4 gripper side nail seat 5 gripper side nail 6 gripper side nail seat 7 drive shaft 8 impression cylinder

Claims (3)

[Claims] 1. An impression cylinder to which an image forming material is attached and a transfer cylinder to which an image receptor is attached. The image forming material and the image receptor are rotated by the rotation of the impression cylinder and the transfer cylinder. In the apparatus for transferring the image formed on the photosensitive layer of the forming material to the image receptor by introducing it into the nip between the image receptor and the image receptor attachment device, the image receptor upper side and the lower side are spread over the entire width direction. An apparatus comprising a claw and a claw seat for holding the surface of the transfer cylinder, wherein the upper side attachment device is an image provided in a notch portion provided on a part of the surface of the transfer cylinder in the axial direction of the transfer cylinder. A claw for gripping a receptor and a claw seat, wherein the claw and the claw seat are composed of at least two claws divided in the axial direction, and there is a gap in the axial direction between the claw seats. And an image receptor attachment device. 2. The attachment device for an image receptor according to claim 1, wherein the divided claws are simultaneously driven by a drive shaft passing through the claws. 3. The lower side attachment device comprises a nail and a nail seat for gripping an image receptor provided in a notch portion provided in a part of the surface of the transfer drum in the axial direction of the transfer drum, and the nail. The attachment device for an image receptor according to claim 1, wherein the claw seat and at least two claw seats are composed of at least two claws divided in the axial direction, and a gap exists between the claw seats in the axial direction.