JPS63253946A - Image recorder - Google Patents

Abstract

PURPOSE:To eliminate a cutting fault of a shaft even if pressure is applied for many hours, by allowing a bearing of a backup roller to have a self-aligning property. CONSTITUTION:The bearing 6 of a backup roller 3 is allowed to have a self- aligning property. When a photosensitive material and an image receiving material are superposed and brought to a pressure transfer, an application of pressure of the backup roller 3 is executed by pushing its bearing 6 by adjusting a bolt 4 by a spring 5, and in that case, a shaft 7 for supporting the backup roller 3 is bent. In that case, since the bearing 6 is a self-aligning ball bearing, a core of the bearing can be changed in accordance with bending of the shaft, therefore, a repeated stress to a root part 11 of the bearing of the shaft is obviated. In such a way, even if the operation is executed for many hours, it does not occur that the backup roller shaft is ruptured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for pressurizing and conveying a recording material in an image recording device, and more particularly to a device for fixing an image to a sheet by applying pressure with a roller. .

[Conventional technology]

An example of an image recording material that requires at least a pressure treatment step is the one disclosed in JP-A-57-179836, in which a vinyl compound, a photopolymerization initiator, and a colorant precursor are formed on a support. Systems carrying synthetic polymeric resin-walled capsules containing . The image recording method using this system is to imagewise harden the microcapsules by exposure to light, rupture the unhardened microcapsules by applying pressure, and obtain a color image from the released colorant precursor. The method is characterized in that high quality images can be obtained through simple dry processing.

A new recording material which has even higher photosensitivity and can obtain high quality images through simple dry processing is disclosed in Japanese Patent Application Laid-Open No. 61-275742 filed by the present applicant. In this recording material, at least a photosensitive silver halide, a reducing agent, a polymerizable compound, and a color image-forming substance are coated on a support, and at least the polymerizable compound and the color image-forming substance are encapsulated in the same microcapsule. It consists of a photosensitive composition.

Regarding the image recording method of recording images using this photosensitive material, Japanese Patent Application Laid-Open No. 61-2788 filed by the present applicant
It is disclosed in Publication No. 49.

This image recording method first performs imagewise exposure to form a latent image, then develops it by heating, and polymerizes the polymerizable compound in the area where the latent image exists to form a macromolecular compound to form microcapsules. harden. Then, the image-receiving material having an image-receiving layer to which the color image-forming substance can be transferred is stacked and pressurized to rupture at least a portion of the microcapsules in the area where the latent image does not exist, and the color image-forming substance is transferred to the image-receiving material. to obtain an image on an image-receiving material.

Then, using the above-mentioned photosensitive material, this photosensitive material is subjected to imagewise exposure, heat development is performed, and then it is overlaid with an image-receiving material and pressurized, until an image of desired density and desired color density is obtained on the image-receiving material by transfer. As an example of an image recording device that automatically performs
It is disclosed in the specification of No. 492.

In this type of image recording apparatus, in order to transfer the photosensitive material after heat development onto the image-receiving material, the photosensitive material and the image-receiving material are overlapped, inserted between a pair of pressure nip rollers, and subjected to a pressure of, for example, 500 kg/CjA from the front and back sides. It is pressurized at high pressure.

However, since these pressure nip rollers are supported at both ends, the pressing force generated at both ends is higher than the pressing force generated at the center, resulting in uneven transfer due to uneven pressing force. There is a problem.

Therefore, in order to solve this problem, for example, by arranging the axes of a pair of pressure rollers so that they are shifted by a small angle from each other, a skew can be created that makes the pressure applied to the pressing part between both rollers uniform over the entire area. A backup roller pressing device that makes the pressure applied to the pressing portion of the pressure nip roller almost uniform by arranging a backup roller on the opposite side of each pressing portion of a roller pressing device or a pair of parallel pressure nip rollers. etc. have been proposed.

An example of a conventional pressure transfer device will be explained using a diagram. FIG. 4 is a front view of the conventional pressure transfer device. It has a free nip roller 2 and a backup roller 3 that presses the free nip roller 2 against the fixed nip roller 1. The bearing 6 of the bank up roller 3 is rotated by the bolt 4 via the spring 5 to apply the biasing force of the spring 4. By adjusting the pressing force of the backup roller 3, the fixed nip roller 1 and free nip roller 2
The pressure contact force is adjusted.

[Problem that the invention seeks to solve]

However, the back unroller 3 is short in length because it is effective to mainly press the center of the free nip roller 2.
The shaft 7 leading to the shaft is long and thin, and the pressure of the spring 5 that presses the bearing 6 applies bending stress to the base 11 of the shaft 7, which the bearing 6 receives, and in combination with the torsional stress of rotation, the repeated stress acts when used for a long time. This sometimes causes an accident in which the shaft breaks at the base.Particularly when using the above-mentioned photosensitive material, the above-mentioned accident is likely to occur because a high pressure of 200 kg/- or more is applied.

The present invention solves the above-mentioned problems and provides an image recording apparatus having a pressure transfer device in which the backup roller shaft does not break even when operated for a long time.

[Means for solving problems]

An object of the present invention is to process image information generated on a photosensitive material in which an image generated by imagewise exposure is coated on a support with a substance that is fixed by pressure, by overlapping the photosensitive material and an image-receiving material. In a pressure transfer device of an image recording device that performs pressure transfer, which is composed of two rotatably supported nip rollers and a backup roller in pressure contact with the nip rollers, the bearing of the backup roller is provided with self-aligning properties. This is achieved by an image recording device having the following characteristics.

In the present invention, the two rotatably supported nip rollers may be one in which one is a fixed nip roller and the other is a free nip roller, or both may be composed of nip rollers.

In this case, the number of back associative rollers that press the nip roller is one in the former case, and two in the latter case because a backup roller is required for each free roller.

The present invention can be applied to all cases where the length of the backup roller is 1/3 to 1 of the length of the free roller.

In the present invention, the pressing force of the backup roller is applied to both bearings of the bank up roller, and it is convenient to use a spring, but a water pressure/hydraulic piston may also be used.

In the present invention, providing self-aligning properties to the bearing of the back amp roller means that the bearing of the back amp roller adapts to the distortion of the shaft and aligns with the axial center. Specifically, the bearing has self-aligning properties. Or, even if it is an ordinary bearing, consideration is given to the pressurizing method and fulcrum so that the bearing stand moves in the direction that matches the axis.

[For production]

The image information generated on the photosensitive material in which the image produced by the imagewise exposure of the present invention is coated on the support with a substance that can be fixed by pressure is transferred under pressure by overlapping the photosensitive material and the image receiving material. In the pressure transfer device of the image recording device, which consists of two rotatably supported nip rollers and a bank up roller in pressure contact with the nip rollers, by giving automatic interest to the bearing of the back up roller, There is no repetitive stress at the base of the shaft that comes into contact with the bearing, eliminating the possibility of shaft breakage due to long-term use.

〔Example〕

The present invention will be explained in more detail using figures.

Fig. 1 is a front view of a case where a self-aligning ball bearing is used in the pressure transfer device of the image recording device of the present invention, and Fig. 2 is a front view of a case where a self-aligning ball bearing is used in the pressure transfer device of the image recording device of the present invention. It is a front view of a device in which consideration has been given to the pressurizing method and fulcrum so that it can move.

FIG. 1 shows a state in which the conventional bearing of the backup roller 3 shown in FIG. 4 has been replaced with a self-aligning ball bearing.

A free nip roller 2 rides on a fixed nip roller 1, and the photosensitive material and the image-receiving material are passed between these two nip rollers in an overlapping manner and transferred under pressure. 500 to 600 kg/
− is carried out by pressure. The back-up roller 3 is pressurized by the spring 5 pushing its bearing 6 by adjustment of the bolt 4, the shaft 7 supporting the bank-up roller 3 being bent as shown. At this time, since the bearing 6 is a self-concerning ball bearing, the center of the bearing can be changed in response to the bending of the shaft.
The cyclic stress on 1 is eliminated. FIG. 2 is a partial perspective view of an apparatus in which a photosensitive material and an image-receiving material are overlapped and transferred under pressure between two nip rollers 2a and 2b. Backup rollers 3a and 3b support bearing stands 8a and 3b by support rods 9a and 9b, respectively, and a fulcrum 10 on which the support rods support the bearing stands has a hyperbolic cross section. Also, bearing stands 3a, 8
Bolts 4a, 4b that apply pressure to springs 5a, 5b
The state is such that it can accommodate the inclination of the bearing stands 8a, 8b via the.

When the A-A section of FIG. 2 is shown in FIG. 3, in the backup roller 3a, the bearing stand 8a is arranged so that the normal bearing position is aligned with the axis.

8b moves, and also shows that on the backup roller 3b side, the bearing stands 8a and 8b change direction in accordance with the axis, regardless of the support rods 9a and 9b.

〔Effect of the invention〕

The present invention transfers image information generated on a photosensitive material, which has a support coated with a substance that fixes the image generated by imagewise exposure under pressure, by overlapping the photosensitive material and an image-receiving material. A pressure transfer device of an image recording device comprising two rotatably supported nip rollers and a back-up roller in pressure contact with the nip rollers, characterized in that the bearing of the back-up roller is self-aligning. This image recording device allows the bearing to self-align, thereby eliminating repetitive stress at the root of the shaft that contacts the bearing, allowing it to withstand up to 500 kg/a+ for a long period of time! Even after applying a certain amount of pressure, the shaft did not break.

[Brief explanation of drawings]

FIG. 1 is a front view of one embodiment of a pressure transfer device of an image recording apparatus according to the present invention, FIG. 2 is a partial perspective view of another embodiment of the present invention, and FIG. 3 is a A sectional view and FIG. 4 are front views of an example of a pressure transfer device of a conventional image recording apparatus. 1...Fixed nip roller 2,...Free nip roller 2a, 2b,...Nip roller 3.3a, 3b...Backup roller 4.4a, 4
b = --Bolts 5.5a, 5b...Springs 6a, 6b...Bearings 7...Shafts 8a, 8b...Bearing stands 9a, 9b.
... Support rod 10 ... Fulcrum 11 ... Root portion cylinder 1
Figure 2a

Claims (1)

[Claims] 1) An image in which image information generated on a photosensitive material whose support is coated with a substance that fixes the image generated by imagewise exposure by pressure is transferred by pressing the photosensitive material and an image receiving material by overlapping them. An image characterized in that a pressure transfer device of a recording device includes two rotatably supported nip rollers and a backup roller in pressure contact with the nip rollers, in which a bearing of the backup rollers is provided with self-aligning properties. Recording device.