JPS63223641A - Image forming method - Google Patents

Abstract

PURPOSE:To enable the exact image exposure, without affecting for a focus point by changing relatively driving timing of two nip rollers for a sensitive material equipped at the inlet and outlet sides of the exposure part which sets a photo-pressure sensitive material of the exposure part. CONSTITUTION:The exposure part is constituted by a supporting roller 26 for a material sensitive to exposure, the nip rollers 28, 30 for the sensitive material equipped at inlet side and outlet side respectively. At the time of transporting a prescribed length of the sensitive material into the exposure part, said nip roller 28 together with said supporting roller 26 are stopped the drive by clutches C1, C2, respectively, and the nip roller 30 is then stopped the drive after 0.1-3sec, preferably 0.5sec, thereby decreasing the sag of the photo- pressure sensitive materials S. At this time, said material S is closely placed in contact with the exposure position 32, thereby exactly setting it. Thus, said sensitive material S is closely placed in contact with the supporting roller 26 at the exposure position 32, thereby enabling the image exposure of the sensitive material, without affecting for the focus point.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image forming method using a photosensitive pressure-sensitive material having microcapsules encapsulating a photosensitive composition. In particular, the present invention relates to a method for removing slack in exposed areas of a photosensitive pressure sensitive material during image formation.

[Conventional technology]

As an example of a photosensitive and pressure sensitive material using microcapsules encapsulating a photosensitive composition, for example, Japanese Patent Application Laid-Open No. 57-17983
A system is known in which a synthetic polymer resin wall capsule containing a vinyl compound, a photopolymerization initiator, and a colorant precursor is carried on a support as disclosed in Japanese Patent No. 6. 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. However, this system has the drawback of significantly lower photosensitivity than systems using silver halide.

A new recording material that improves these drawbacks and has high photosensitivity and can obtain high quality images through simple dry processing has been proposed in Japanese Patent Laid-Open No. 61-2 filed by the present applicant.
No. 75742. 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 forming method of forming an image using this photosensitive and pressure sensitive material, Japanese Patent Laid-Open No. 61-27 filed by the present applicant
No. 8849. This image forming 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 high molecular 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 pressure-sensitive material, the photosensitive pressure-sensitive material is subjected to imagewise exposure, heat development is performed, and then it is superimposed on an image-receiving material and pressurized to transfer them to obtain an image on the image-receiving material automatically. An example of an image forming apparatus using this method is disclosed in Japanese Patent Application No. 1987-287492 filed by the present applicant.

As this type of apparatus and method, the exposed parts and exposure method were as follows.

That is, in the image forming apparatus according to the present invention shown in FIG.
A document is placed face down on the glass plate 2, and the glass plate 2 moves back and forth in the direction of arrow A.

At the bottom of the glass plate 2, there is a reflecting mirror 6 for illuminating the original.
An additional illumination lamp 8 is provided, and a fiber lens array 10 is provided for forming an original image on the photosensitive pressure sensitive material S at a predetermined position.

A photosensitive material cartridge 14 containing a photosensitive material roll 12 wound with a photosensitive pressure sensitive material S is removably attached to the side of the housing 1. A pair of sensitive material feeding rollers 21 and 22 housed in the magazine connection dark box 20 are disposed at the outlet 16 for the photosensitive pressure-sensitive material and material S of the photosensitive material cartridge 14. The pressure-sensitive material S is extended by a certain length at a predetermined time, and is also retracted as desired.

When the leading edge of the photosensitive pressure sensitive material S advances, the sensitive material feeding rollers 21 and 22 move away from each other as shown by phantom lines to facilitate the advance of the photosensitive pressure sensitive material S. A cutter unit 23 for cutting the photosensitive pressure sensitive material S and a guide plate 24 are arranged in front of the magazine connection dark box 20 (the front refers to the downstream side in the direction of travel of the photosensitive pressure sensitive material, etc.). There is.

In front of the guide plate 24, an exposed photosensitive material support roller 26 and two photosensitive material nip rollers 28, 30 pressed against the exposed photosensitive material support roller 26 are arranged. The light-sensitive pressure-sensitive material S guided by the guide plate 24 is brought into close contact with the exposed light-sensitive material support roller 26 by the light-sensitive material nip rollers 28 and 30.
Imagewise exposure of the document is made by the fiber lens array 10 at a position 32 between 8.30 and 30.

Further, in front of the exposed photosensitive material support roller 26, a heat developing device 40 is arranged to heat and develop the exposed photosensitive material S, and the photosensitive pressure sensitive material S is heated to about 120° C. by the heat developing device 40. After being developed, the image receiving paper C sent from the image receiving paper cartridge 73 through the vertical guide device 58 is superimposed in the superimposing device 70, and is subjected to a pressure of about 500 kg/- in the transfer device 88. An image is transferred from the material S to an image-receiving paper C, and the used photosensitive pressure-sensitive material S and the image-receiving paper C on which the image has been formed are peeled off by a photosensitive image-receiving paper peeling device 90 and taken out.

[Problem that the invention seeks to solve]

However, since the photosensitive pressure sensitive material uses a thin material as a support, it tends to curl, and as shown in FIG. Outlet side photosensitive material nip roller 3
If the photosensitive material at the exposure position 32 is caught by the exit-side photosensitive material nip roller 30 after hitting surface 0 once, the photosensitive material at the exposure position 32 will not be in close contact with the exposure roller and will be set in a floating state. This is undesirable in the case of image exposure because it not only causes the image to be out of focus but also disrupts the overall image structure.

SUMMARY OF THE INVENTION The present invention solves the above problems and provides an image forming method using a method of setting a sensitive material in an exposure section, which allows accurate image exposure without loss of focus.

[Means for solving problems]

The above-mentioned object of the present invention is to eliminate the sag by slightly delaying the stop of the exit-side photo-material nip roller when the entrance-side photo-material nip roller stops after feeding out a predetermined length of the photo-sensitive material. achieved by doing.

That is, the present invention is an image forming method using a photosensitive pressure-sensitive material, which involves relatively changing the drive timing of two photosensitive material nip rollers on the entrance side and exit side of the exposure section that set the photosensitive pressure-sensitive material in the exposure section. This image forming method is characterized by transporting the sensitive material without causing it to sag during exposure.

The photosensitive pressure-sensitive material and the image forming method of the present invention are those of the type in which a polymerizable compound is imagewise cured by imagewise exposure and then pressure is applied to obtain a visible image, which is related to the application filed by the present applicant. The material disclosed in Japanese Patent Application Laid-Open No. 57-179836 is cited. This material contains a vinyl compound, a photoinitiator, and a colorant precursor on a support.
It supports a synthetic polymer resin wall capsule containing.

Alternatively, after containing silver halide and applying imagewise exposure, heat development is performed to develop the silver halide, the polymerizable compound is simultaneously cured in correspondence with this development, and then pressure is applied to form a visible image. An example of the material that can be obtained is the material disclosed in Japanese Patent Application Laid-Open No. 61-278849 filed by the present applicant.

The material disclosed in JP-A No. 61-278849 is
After thermal development, a color image-forming substance is transferred to an image-receiving material having an image-receiving layer to obtain an image on the image-receiving material, and at least a photosensitive silver halide, a reducing agent, a polymerizable compound, and A color image forming substance and a color image forming substance are encapsulated in the same microcapsule.

By relatively changing the driving timing of the two photosensitive material nip rollers on the entrance side and the exit side of the exposure section in the present invention,
Conveying the photosensitive material without sagging during exposure specifically means: ■ When the inlet side photosensitive material nip roller stops once after sending out a predetermined length of photosensitive material, the exit side photosensitive material nip roller stops slightly. The delay eliminates slack, and during exposure, both the entrance and exit sides are driven. ■ At the start of exposure, the nip roller on the exit side starts driving earlier than the nip roller on the entrance side, and after removing the slack, the exposure starts.■ After the nip roller on the entrance side feeds the photosensitive material, the nip roller on the entrance side becomes a free roller, and the nip roller on the exit side becomes a free roller. In this method, only the rollers on the exit side are driven to eliminate slack and start exposure.

Embodiments of the present invention will be described using figures. However, the present invention is not limited to this embodiment.

FIG. 1 (Al is an exposure part composed of an exposed photosensitive material support roller 26, an entrance side photosensitive material nip roller 28, and an exit side photosensitive material nip roller 30. The photosensitive and pressure sensitive material S that has entered the photosensitive material S first collides with the surface of the photosensitive material nip roller 30 due to its own curls, causing sagging at the exposure position 32 as shown in FIG. .

Entrance side photosensitive material nip roller 28 carrying a predetermined length of photosensitive material
7C, C, and C together with the exposed photosensitive material support roller 26, respectively.
, the drive is stopped. The photosensitive material nip roller 30 on the exit side is then stopped for 0.1 to 3 seconds, preferably 0.5 seconds, to take up the slack and the photosensitive material S is set accurately in close contact with the exposure position 32. Leave the slack or slack as it is, stop driving the exit side and the entrance side at the same time, and when exposure starts, start driving the exit side photosensitive material nip roller 30 earlier than the entrance side photosensitive material nip roller 28. After eliminating the slack, close the clutch CI. How to feed the photosensitive material using both nip rollers.

Alternatively, after feeding the photosensitive material S to a fixed length, the entrance side photosensitive material nip roller 28 may open the clutch C2 and become a free roller and be driven only by the exit side photosensitive material nip roller 30 for exposure.

FIG. 1 (bl is one of the other embodiments and the exposure table 2
Separate entrance-side photosensitive material nip rollers 28 on both sides of 6b
b and an exit side photosensitive material nip roller 30b, the photosensitive pressure sensitive material S is nipped by the entrance side photosensitive material nip roller 28b and advanced to the exposure position 32, the exit side photosensitive material nip roller 30b
Even if the photosensitive pressure-sensitive material S initially slackens at the exposure position 32, it becomes 0 after opening the drive stop clutch C3.
．． After 1 to 3 seconds, preferably 0.5 seconds, the clutch C is opened and the drive is stopped, thereby exposing the exposure position 3.
The sagging of the photosensitive pressure-sensitive material S in 2 can be completely eliminated, and the same method as in FIG. 2(a) can be used.

[For production]

The present invention is an image forming method using a photosensitive pressure sensitive material,
By relatively changing the driving timing of the two photosensitive material nip rollers on the entrance and exit sides of the exposure section that set the photosensitive pressure-sensitive material in the exposure section, the photosensitive material is prevented from sagging during exposure. This eliminates sagging of the photosensitive pressure-sensitive material at the position, allowing accurate image exposure without loss of focus.

〔Example〕

An image forming method with an outer diameter of 10 mm using the mechanism shown in Figure 1.
The two photosensitive material nip rollers on the inlet side and outlet side of (2) are brought into contact with the exposed photosensitive material support roller, and the exit side photosensitive material nip roller is stopped 0.5 seconds after the inlet side photosensitive material nip roller stops, and the photosensitive pressure sensitive material is Set it to the exposure position. The photosensitive pressure sensitive material was in close contact with the exposed photosensitive material support roller at the exposure position, allowing for accurate and focused image exposure.

[Brief explanation of drawings]

FIGS. 1(a) and (4) are explanatory diagrams of an embodiment of the exposure unit set of the image forming method of the present invention, FIG. 2 is an explanatory diagram of an example of a conventional exposure unit set, and FIG. 3 is an explanatory diagram of an example of the exposure unit set of the image forming method of the present invention. 1 is a side view of an embodiment of an image forming method related to FIG. l...Housing 2...Glass plate S...Photosensitive pressure sensitive material 6...Reflector 8...Illumination lamp 10...Fiber lens array 12...Sensitive material roll 14...Sensitivity material cartridge 16...outlet 20...magazine connection dark box 21.22...sensitive material feeding roller 23...cutter unit 24...guide plate 26...exposure sensitive material support roller 26a...exposure Table 28.28b...Sensitive material nip roller (inlet side) 30.
30b...Sensitive material nip roller (outlet side) 32...Exposure position C1, C! IcJ, 0th line...Clutch M...Drive device 40...Heat developing device 58...Vertical guide device 73...Receiving paper cartridge 70...Layering device 88...Transfer device 90. ...Sensitive image receiving paper peeling device C...Image receiving paper (3 others) Figure 1

Claims (1)

[Claims] This is an image forming method using a photosensitive pressure-sensitive material, in which the driving timing of two photosensitive material nip rollers on the entrance side and the exit side of the exposure section, which set the photosensitive pressure-sensitive material in the exposure section, is relatively changed. An image forming method characterized by conveying a photosensitive material without causing it to sag.