Untitled record

Description: TECHNICAL FIELD [Detailed description of the invention]

【0001】

[Industrial application field]

The present invention relates to an image transfer device. More specifically, the image receptor can be easily and quickly processed without causing waviness of the image receptor, non-uniformity of the insertion length in the image receptor clamp when the image receptor is attached based on curl, and non-uniformity of the clamp gripping force. The present invention relates to an image receptor attachment device that can be attached.

【0002】

[Conventional technology]

Recently, an image forming material in which a photosensitive layer is applied to one surface of a support is image-exposed, and then an image formed on the photosensitive layer is imaged on paper or the like under heating, generally at around 100 ° C. Single-color or multi-color prepress proofs suitable for proof printing and the like to be transferred to a receptor have been produced. The image forming material includes a support, a photosensitive layer formed on one surface of the support, and a protective film. For the support and 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 receptor, an appropriately selected printed matter such as paper or film is adopted.

【0003】

As a device for creating the prepress proof, an impression cylinder with an image-forming material attached and a transfer cylinder with an image receptor attached are provided so that the photosensitive layer of the image-forming material and the image receptor face each other. A device that is contact-pressurized and transfers an image formed on a photosensitive layer at a nip between both bodies to an image receptor has been generally proposed. When an image receptor such as paper is preheated and the photosensitive layer of the image forming material is pressure-bonded to the image receptor to transfer the image formed on the photosensitive layer to paper, the image transfer proceeds smoothly. You can get beautiful printed matter. For this reason, it is usual to provide a heating means capable of heating the surface of the transfer cylinder appropriately, for example, around 100 ° C. inside the transfer cylinder to which the image receptor is attached.

【0004】

The image receptor such as paper used in the present invention has a property that curl, waviness, etc. are likely to occur due to heat. Therefore, the image receptor in contact with the surface of the heated transfer cylinder easily causes curl, waviness, and the like. When the image receptor is grasped by one claw extending in the longitudinal direction of the transfer trunk, which has been conventionally used as an image receptor holding device, the image receptor is inserted into a narrow gap provided by the claw. Therefore, curling and waviness at the portion to be gripped by the nail cause double folding of the image receptor at the gripped portion. For this reason, wrinkles are generated in the vicinity of the gripped portion, or the length of the image receptor inserted into the nail is inaccurate. In addition, wrinkles may occur on the edges of the produced printed matter, or non-uniformity of the gripping pressure due to the nails may occur.

【0005】

As an image receptor attachment device in the transfer body, a soft sheet-like object such as a conventional image receptor is easily attached and detached, does not cause wrinkles, and the insertion length in the nail is easily made constant. The development of an image receptor retention device has been strongly sought after, but a device that satisfies such a desire has not yet been developed.

【0006】

[Problems to be Solved by the Invention]

According to the present invention, in an image transfer device such as a device for creating a prepress proof, a soft sheet-like object such as an image receptor can be inserted into a claw at a constant length without causing wrinkles or the like, and the sheet shape. An object of the present invention is to provide an image transfer device provided with an image receptor attachment device that makes it easy to attach and remove an object.

【0007】

[Means for solving problems]

The present invention comprises an impression cylinder with an image-forming material attached and a blanket wrapped around the surface and a heated transfer cylinder with an image receptor attached, and the image-forming material and the image receptor are attached to the impression cylinder and the transfer cylinder. In a device that is introduced into the nip between the image receptor and transfers the image formed on the photosensitive layer of the forming material to the image receptor, the image receptor attachment device covers the upper side and the lower side of the image receptor in the entire width direction. It is a device for holding the image on the surface of the transfer cylinder, and the upper side device is provided at least two image receptors provided in the notch portion provided on a part of the surface of the transfer cylinder in the axial length direction of the transfer cylinder. Provided is an image receptor attachment device characterized in that a gripping claw, a claw seat, and a stopper for positioning an image receptor are provided between the claws.

【0008】

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a schematic cross-sectional view of an image transfer apparatus used in the present invention including an impression cylinder 9 to which an image forming material is attached and an image receptor, for example, a transfer cylinder 1 to which paper is attached. FIG. 2 shows a partially enlarged view of the upper side attachment device of the image receptor.

【0009】

The configuration of the image transfer apparatus used in the present invention will be described with reference to FIG. A notch 2 is provided on a part of the surface of the transfer cylinder 1, and a clamp and a lower side (grip side) including a claw 3 and a claw seat 4 constituting an upper side (holding side) attachment device are provided in the notch. A clamp consisting of a claw 5 and a claw seat 6 constituting the attachment device is installed. The claws and claw seats are installed in the axial length direction of the transfer cylinder. The claw 3 is divided into a plurality of parts in the axial length direction, and a stopper 7 for positioning an image receptor is provided between the claws 3. It is preferable that the claw 5, the claw seat 4, and the claw seat 6 are also divided into a plurality of parts in the axial length direction. The positioning stopper and clamp shall have a height that does not protrude from the circumferential surface of the transfer cylinder. A heat source 8 for heating the image receptor is installed on the inner surface of the transfer cylinder 1.

【0010】

The configuration described below is an example of the impression cylinder, and may have other aspects. A part of the notch portion 10 is provided in the impression cylinder 9, and the blanket 11 wound around the surface of the impression cylinder 9 in the notch portion is fixed by the blanket fixing means 12. An inclined portion 13 is provided between the partially cutout portion 10 and the impression cylinder surface (circumferential surface), and the pin bar 14 is installed on the inclined portion. The pin bar 14 has a height at which its tip does not protrude outside the circumferential surface of the impression cylinder 9. This is because the surface of the pin bar 14 or the transfer cylinder 1 is not damaged when the impression cylinder 9 and the transfer cylinder 1 rotate. The magnet sheet 15 is rotatably mounted in the partially cutout portion 10. Adhesive tape 16 is provided on the surface of the impression cylinder in the vicinity of the inclined portion 13 on the surface of the impression cylinder and in the vicinity of the partially cutout portion 10 in the direction opposite to the arrow. The magnet sheet 15 has a sufficient width to cover the pin bar 14 beyond the notched portion 10 although it does not reach the adhesive tape 16 when it is tilted in the direction opposite to the arrow.

【0011】

FIG. 2 shows the upper side of an image receptor having at least two image receptor grasping claws 3 and an image receptor positioning stopper 7 between the claws (the image receptor is first placed on the transfer cylinder). The side to be attached to, that is, the grip side) The attachment device is shown. The upper side attachment device includes a plurality of claws 3 rotated by a drive shaft 17 installed in a partially cutout portion 2 of the transfer cylinder 1, and a claw extending in the axial length direction of the transfer cylinder facing the claws. It consists of an image receptor positioning stopper 7 installed between the seat 4 and each claw 3. A surface layer made of an elastic resin may be provided on the image receptor side of the nail seat and / or the image receptor side of the nail to ensure gripping of the image receptor. This also applies to the lower side claw 5 and the claw seat 6. Further, the claw 3 is provided with a mounting angle adjusting bolt 18 that penetrates the claw 3 near the drive shaft 17 side to adjust the contact angle between the claw 3 and the claw seat 4, and an image receptor by the claw (not shown). ) Is preferably adjusted. It is preferable to install mounting angle adjusting bolts on the lower side claw 5 of the image receptor as well as the claw 3. The upper claw seat 4 and the lower claw seat 6 of the image receptor may be continuous or intermittent in the axial length direction of the transfer cylinder 1. Intermittent is preferable because the distortion caused by thermal expansion and contraction can be eliminated.

【0012】

Hereinafter, the operation of the image transfer device including the image receptor wearing device of the present invention will be described. When attaching an image receptor such as paper to the transfer cylinder 1, first, the claw 3 is rotated by the drive shaft 17 to expand the space between the claw 3 and the claw seat 4. The image receptor 19 is inserted into this gap until it hits the stopper 7, and then the claw 3 is rotated to grip the image receptor 19 between the claw 3 and the claw seat 4. After gripping, the transfer cylinder 1 is rotated in the direction of the arrow (Fig. 1) while the image receptor is in close contact with the surface of the transfer cylinder. When the image receptor reaches the position of the claw 5 which is the lower side holding device, the claw 5 is rotated by the drive shaft 17, the claw 5 is opened, the image receptor is inserted, and the claw 5 and the claw seat 6 are inserted. Grasp the image receptor between. Since the lower side holding device grips the image receptor while pulling the image receptor, it is not necessary to install a positioning stopper like the upper side holding device. Further, since the image receptor is subjected to a tensile force, problems due to the generation of wrinkles, curls, etc. do not occur.

【0013】

To attach the image forming material to the impression cylinder 9, insert a hole corresponding to the pin bar 14 provided in the image forming material into the pin bar 14, hold the image forming material (not shown) with the magnet sheet 15, and then form the image. The impression cylinder 9 is rotated in the direction of the arrow while applying an appropriate tension to the material, and the upper side and the lower side of the image forming material are fixed to the impression cylinder surface with the adhesive tape 16. After installing the image receptor and the image-forming material on the transfer cylinder and the impression cylinder, respectively, the transfer cylinder and the impression cylinder are rotated to form the image receptor on the photosensitive layer of the image-forming material at the nip between the two cylinders. The image is crimped onto the image and the image is transferred to the image receptor.

【0014】

[Effect of the invention]

According to the present invention, there is provided an image receptor attachment wearing device that can be attached to the transfer cylinder so that the gripping length of the image receptor by the clamp is constant. Further, according to the present invention, there is provided an image receptor wearing device in which there is no variation in the gripping pressure due to the clamp in the axial length direction and no wrinkles or the like are generated at the edges of the produced printed matter.

[Simple explanation of drawings]

[Figure 1]

It is a schematic cross-sectional view of an image transfer apparatus.

[Figure 2]

It is the schematic explanatory drawing of the upper side holding device.

[Explanation of symbols]

1 Transfer cylinder 3 nails 4 Claw seat 7 Positioning stopper 17 Drive shaft