JPH0511425A - Image forming device - Google Patents

Abstract

PURPOSE:To synthesize an image without preparing a memory means on an inputting side, and at the same time, to output paper having plural color developing paper sizes without preparing pressuring width adjusting mechanism on a pressure developing a device, on an image forming device forming an image by using a photosensitive and pressure-sensitive paper and a color developing paper. CONSTITUTION:The two pressure developing devices having the pressuring width which is half of the color developing paper size are provided, and two pressure developing devices 7a and 7b are arranged in such a state where they are lined up sideways in staggered, so that the one half side of the color developing paper 6 is selected to be pressured and developed. Simultaneously, a paper supplying cassette for a small color developing paper size is arranged in such the state where it is offset to the one half side with respect to a normal cassette 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, as an image forming apparatus 50 of this type, as shown in FIG. 4, an image displayed on a CRT 1 is exposed through a lens 2 on an exposure plate 3 from a light-shielding cartridge 22 and a pair of first images. The photosensitive pressure-sensitive paper 4 supplied by the feed roller 23 is exposed to light, and a latent image is formed on the photosensitive pressure-sensitive paper 4. The photosensitive pressure-sensitive paper 4 on which the latent image is formed is conveyed by the pair of second feed rollers 24, and the exposed surface thereof is covered with the half-moon roller 5.
Thus, the sheet is conveyed from the sheet feeding cassette 25 to the pressure developing device 7 by being superposed on the developer paper 6 conveyed one by one through the sheet guide 21 and the sheet feeding roller 20. In the pressure developing device 7, the latent image formed on the photosensitive pressure-sensitive paper 4 is pressure-developed and transferred to the color-developing paper 6 by the pair of pressure rollers 14. Then, the pressure-sensitive developing paper 4 and the color-developing paper 6 which are in close contact with each other are separated by the separation shaft 8, and the light-sensitive pressure paper 4 is wound around the winding shaft 9.

On the other hand, the color developing paper 6 is conveyed by a pair of conveying rollers 15, passes between a pair of guide plates 17, and is conveyed to the heat fixing device 11. Then, the developer 6 is conveyed at the same speed as the conveying speed in the pressure developing device 7,
The latent image on the color-developed paper 6 is heat-fixed by the heat roller 12 and the fixing roller 13 having a heating element forming the heat fixing device 11, and then guided by the pair of guide plates 26 and the paper discharge roller 27. Is discharged to the paper discharge tray 18. When the pressure developing process in the pressure developing device 7 is completed and the separation of the photosensitive paper 4 and the color developing paper 6 is completed, the conveyance of the photosensitive paper 4 is stopped and the next exposure is started.

[0004]

However, in general, it is difficult for an image forming apparatus of this type to form a plurality of images on one color developing paper at a time, and if this is realized, a frame memory is required. There is a drawback in that the CRT exposure device provided must be used to combine images on the input side in advance, or a plurality of output images must be output, cut and pasted, and copied and combined by another copying device. It was

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a simple image forming apparatus capable of performing image composition without the input device having a memory function. I am trying.

[0006]

In order to achieve this object, an image forming apparatus of the present invention comprises an exposing means for exposing a photosensitive pressure-sensitive paper and forming a latent image on the photosensitive pressure-sensitive paper, and an exposing means on the photosensitive pressure-sensitive paper. Pressure developing means for developing the latent image formed on the color developing paper under pressure, and heat fixing means for thermally fixing the latent image developed under pressure on the developing color paper, and the pressure developing means further comprises: The pressure developing device is composed of two pressure developing devices having a pressure width which is half the width of the output color paper, and the two pressure developing devices are:
They are arranged side by side in a zigzag pattern with respect to the conveyance path of the photosensitive paper. In addition, the pressure developing device is provided with a mechanism for releasing the pressure processing by a signal.

[0007]

In the image forming apparatus of the present invention having the above-mentioned structure, the pressure developing means performs the exposure of the first half of the latent image on the photosensitive pressure-sensitive paper and the second half of the latent image. One half of the latent image on the light and pressure sensitive paper is pressure-developed on the same color paper.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an image forming apparatus 30 embodying the present invention, and a conventional image forming apparatus 5 shown in FIG.
The same members as 0 will be described with the same reference numerals.

Now, as shown in FIG. 1, the image forming apparatus 3
A CRT 1 and a lens 2 on which an image input by an input device (not shown) is displayed are arranged above the exposure plate 0 of 0. To the right of the exposure plate 3, the photosensitive pressure-sensitive paper 4 wound around the cartridge shaft 22a in the light-shielding cartridge 22 provided below the exposure plate 3 is provided.
Is provided with a pair of first feed rollers 23.

On the left side of the exposure plate 3, there is provided a pair of second feed rollers 24 for supplying the exposed photosensitive pressure-sensitive paper 4 to the pressure developing device 7a. In the pressure developing device 7a, the photosensitive paper 4 is formed on the color developing paper 6 fed through the paper guide 21 and the pair of paper feeding rollers 20 arranged on the left side of the pressure developing device 7a. Pair of pressure rollers 14a for performing pressure development processing on one half of the formed latent image.
Has been made. Further, under the pressure developing device 7a, a latent image on the photosensitive pressure-sensitive paper 4 formed by the second exposure is pressed on one side half of the color developing paper 6 which has not been developed by the pressure developing device 7a. A pressure developing device 7b for developing and a pressure roller 14b are provided.

Below the paper guide 21, the developer paper 6 is
There are provided a paper feed cassette 25 in which the sheets are stacked and housed, and a half-moon roller 5 that sends out the color papers 6 one by one to the paper guide 21 and the paper feed roller 20. On the other hand, the pressure developing device 7
Below b, there is provided a separation shaft 8 for separating the pressure-sensitive development-processed and pressure-sensitive paper 4 and the color-developing paper 6 from each other. To the right of the separation shaft 8, the separated photosensitive pressure-sensitive paper 4
A take-up shaft 9 for taking up is arranged. Further, below the separating shaft 8, a pair of conveying rollers 15 for conveying the separated color developing paper 6 is provided. Below the conveying roller 15, a pair of guide plates 17 for guiding the separated color paper 6 and a color paper retraction path 28 following the guide plate 17 are provided. Further, on the right side of the retreat path 28, a heat fixing device 11 including a heat roller 12 having a built-in heating element and a fixing roller 13 pressed against the heat roller 12 is provided. On the right side of the apparatus 11, a paper discharge roller 27 and a paper discharge tray 18 for discharging the heat-fixed color developing paper 6 are provided.

Next, the operation of the image forming apparatus 30 thus constructed will be described.

When a desired image is copied, if a start key (not shown) is pressed, the first image input by the input device is displayed on the CRT 1 (hereinafter referred to as the first image). Then, the first image is formed on the exposure plate 3 by the lens 2, is exposed on the photosensitive pressure-sensitive paper 4 supplied from the cartridge 22 by the first feed roller 23, and a latent image is formed on the photosensitive pressure-sensitive paper 4. It At this time, the light and pressure sensitive paper 4 is stationary on the exposure plate 3. The photosensitive pressure-sensitive paper 4 on which the latent image is formed is pressed by the second feed roller 24 to the pressure developing device 7a.
Be transported to.

To the pressure developing device 7a, the color-developed paper 6 fed out from the paper feeding cassette 25 one by one by the half-moon roller 5 and fed through the paper guide 21 and the paper feeding roller 20 is conveyed. The developing paper 6 is superposed on the exposed surface of the light and pressure sensitive paper 4, and the latent image is transferred to the developing paper 6 by pressure development by the pressure roller 14a provided in the pressure developing device 7a. To be done. This pressure development process is performed only on one half of the color developing paper 6 as shown in FIG. When a normal output image is obtained, the pressure roller 14b of the pressure developing device 7b is nipped at the time when the leading edge of the color developing paper 6 is transported to the pressure developing device 7b while being transported. As a result, the pressure developing device 7a performs pressure development on one half of the color developing paper 6 which has not been developed, and the image formation is completed.

Next, in the present embodiment, the procedure for developing the composite image on one color developing paper 6 will be described with reference to FIG. 1. The first image is developed on the color developing paper 6 by the pressure developing device 7a. After that, the conveyance is continued, and when the separation shaft 8 completes the separation of the color-developing paper 6 and the photosensitive pressure-sensitive paper 4, the pressure developing device 7
a, the nip is released, and the color-developing paper 6 is moved to the retract path 28.
Then, the rear end is retracted while being nipped by the transport roller 15. At the same time, the conveyance of the photosensitive pressure-sensitive paper 4 is once stopped, and the CRT 1 performs a second exposure on the photosensitive pressure-sensitive paper 4 to form a latent image. In the meantime, the color developing paper 6 is rewound from the retreat path 28 to the paper guide 21 by the conveying roller 15, and the leading end thereof is set at a predetermined position of the pressure developing device 7b. When the formation of the latent image is completed by the second exposure, the photosensitive pressure-sensitive paper 4 is started to be conveyed again, and when the latent image overlaps with the color developing paper 6 of the pressure developing device 7b, the pressure developing device 7b.
Nip and display the second image on the developer paper 6 as shown in FIG.
It is pressure-developed on the one side half where the above image formation is not performed.

When the pressure development is completed, the photosensitive pressure-sensitive paper 4 and the color-developing paper 6 are separated again by the separating shaft 8, and the photosensitive pressure-sensitive paper 4 is wound around the winding shaft 9. On the other hand, the separated color paper 6 is conveyed by the conveying roller 15 to the thermal fixing device 11 through the retreat path 28, and the heat fixing process is started by the heat roller 12 and the fixing roller 13. The color-developed paper 6 that has undergone the heat fixing process is discharged onto the paper discharge tray 18 by the paper discharge rollers 27.

By the way, the pressure developing means configured as described above can select and develop one half of the color developing paper 6 on one side, so that when the size of the color developing paper is half the normal size, for example, is prepared. As shown in FIG. 3, if a small-size paper feed cassette 29 is arranged offset from the normal-size paper feed cassette 25, the pressure developing device on one side is operated to develop the small-size color paper under pressure. Can be done. As a result, it is possible to output a plurality of color paper sizes without providing a mechanism for adjusting the pressure developing width of the pressure developing device.

[0019]

As is apparent from the above description, according to the image forming apparatus of the present invention, it is possible to combine images by a simple mechanism, and at the same time, the pressure developing device is not provided with a pressure width adjusting mechanism. It is possible to output multiple color paper sizes.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an image forming apparatus according to the present invention.

FIG. 2 is a diagram showing a developing area of a pressure developing device of the image forming apparatus of this embodiment.

FIG. 3 is a schematic sectional view of an image forming apparatus having a plurality of output sheets according to this embodiment.

FIG. 4 is a schematic sectional view of a conventional image forming apparatus.

[Explanation of symbols]

 1 CRT 2 Lens 3 Exposure Base 4 Photosensitive Pressure Paper 6 Color Paper 7 Pressure Developing Device 11 Thermal Fixing Device 12 Heat Roller 25 Paper Feed Cassette 28 Evacuation Path 29 Paper Feed Cassette

Claims (1)

Claim: What is claimed is: 1. An exposure unit for exposing a photosensitive pressure-sensitive paper to form a latent image on the photosensitive pressure-sensitive paper, and a latent image formed on the photosensitive pressure-sensitive paper applied to a color-developing paper. Pressure developing means for pressure developing,
An image forming apparatus having heat fixing means for heat-fixing a latent image pressure-developed on the color developing paper is provided with two pressure developing means having a pressing width half the maximum width of the color developing paper. Further, the pressure developing means is provided with a mechanism for releasing the pressure processing by inputting a signal that detects the conveying distance of the light and pressure sensitive paper, and further, the two pressure developing means are staggered. Image forming apparatus that is laterally arranged in the.