JPH0229743A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent the unused part of a photosensitive and pressure-sensitive recording sheet from being carried by separately carrying the photosensitive and pressure- sensitive recording sheet and a developing sheet, both of which the through with pressure development, to use the recording sheet effectively, and to shorten and period of time till subsequent image formation by carrying the developing sheet while a microcapsul sheet is rewound. CONSTITUTION:A sensor 39 carries out a developing sheet 38 by the prescribed amount after its front edge is detected, and closes the rollers 21 and 31 when the front edge is inserted between the rollers. The sensor 39 carries out the developing sheet 38 by the prescribed amount after its trailing edge is detected, and separates the rollers from each other before the trailing edge passes through the rollers. In such pressure developing operation, a latent image on a microcapsul sheet 37 is developed and transferred onto the developing paper 38. The paper 37, passed through the developing device 20, is wound onto a shaft 25; when the trailing edge of the developing paper 38 passes through a peeling roller 23, the paper 37 is rewound by such amount that the for front of its unexposed area in the vicinity of the roller 23 comes to the front edge A of the exposure area o an exposing table 19F; and the developing paper 38 continuously goes through a heat fixing device and is ejected out of the copying machine 40.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an image forming apparatus using a light-sensitive pressure-sensitive recording sheet and a color developing sheet.

[Prior Art] Conventionally, this type of image forming apparatus rewinds the portion of the light-sensitive and pressure-sensitive recording sheet immediately before it is inserted into the pressure roller to the area where exposure is performed when the color developer sheet is discharged. Ta.

[Problems to be Solved by the Invention] However, in the above-mentioned prior art, after pressure development is completed and until the developer sheet is discharged, unused portions of the light-sensitive and pressure-sensitive recording sheet that do not contribute to image formation are also transported. However, there are problems in that the effective utilization rate of the photosensitive pressure-sensitive recording sheet and the time efficiency until the next image forming process are low.

The present invention has been made to solve the above-mentioned problems, and includes a conveyance means that can drive the conveyance of a color developer sheet separately for conveyance of a light-sensitive pressure-sensitive recording sheet after pressure development, and a pressure development means. A pressure roller opening/closing means is provided for opening and closing the pressure roller, and after pressure development is completed, the pressure roller is opened and the photosensitive pressure recording sheet after the pressure development unit is rewound to the area where exposure is performed. It is characterized by, and its purpose is,
The object of the present invention is to reduce as much as possible the unused portion of a photosensitive pressure-sensitive recording sheet that does not contribute to image formation, and to shorten the time required to start the next image forming process.

[Means for Solving the Problems] In order to achieve this object, the image forming apparatus of the present invention includes a conveyance means that can drive the conveyance of the light-sensitive pressure-sensitive recording sheet and the conveyance of the color developer sheet separately after pressure development. , and pressure roller opening/closing means for opening and closing the pressure roller of the pressure developing means.

[Function] The present invention having the above configuration is characterized in that after the color developer paper and the light and pressure sensitive recording are separated by the conveying means for the light and pressure sensitive recording sheet and the color developer sheet, and the pressure development means, pressure development is performed. The photosensitive pressure sensitive recording sheet after the unit is rewound to the area where exposure is performed.

[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.

FIG. 2 is a schematic sectional view of a photosensitive and pressure sensitive copying machine that is capable of full color copying. Incidentally, a photosensitive paper (consisting of microcapsule paper and developer paper) that enables such copying has been proposed in Japanese Patent Application Laid-Open No. 58-88739, etc., and will not be described in detail here.

As shown in the figure, the photosensitive copying machine 40 is composed of an original platen glass 2 and an original platen cover 1, the top plate of which is movable in the horizontal direction.A desired original is placed face down on the original platen glass 2. can be placed.

A light source consisting of a halogen lamp 3 extending in a direction perpendicular to the direction of movement of the document table glass 2 and a semi-cylindrical reflecting mirror 4 arranged to surround it is fixed to the upper right side of the copying machine 40. Light is irradiated in a line toward the document table glass 2.

Therefore, the light emitted from the halogen lamp 3 can sequentially illuminate the entire surface of the document table glass 2 from the left end to the right end by moving the document table glass 2 in the left-right direction. The light emitted from the light source passes through the transparent original platen glass 2 and is reflected by the original placed on it. A document table cover 1 is provided to cover the document table.

In addition, in order to use the light emitted from the halogen lamp 3 to irradiate the original with high efficiency, a beam flap 5 is arranged to the left of the light source, and reflects the light that is not directed directly toward the original and uses it again to irradiate the original. .

A fan 6 and a louver 7 are provided to the right of the halogen lamp to draw air from the outside. As a result, air can be efficiently applied to the document table glass 2. halogen lamp 3
The light irradiated from the original plate and reflected from the original placed on the original platen glass 2 passes through the filter 8 and enters the lens 9 .

The filter 8 is used to change the light transmission characteristics according to the sensitivity characteristics of the microcapsule paper 37 and adjust the color tone of the copied image. The lens 9 is attached to a lens attachment plate 10, and allows minute angle adjustment with respect to the optical path.

The light condensed by the lens 9 is turned 180' by two reflecting mirrors 11, and is imaged on the microcapsule paper 37 closely positioned below the exposure table 19. The two reflecting mirrors 11 are fixed to a mirror mounting plate 12, and the optical path length and focus are adjusted by finely adjusting the mounting position of the mirror mounting plate 12.

On the other hand, a long microcapsule paper 37 is housed in a removable cartridge 13 placed below the document table glass 2 while being wound around the cartridge shaft 14.
One end thereof passes through a number of rollers and a pressure developing device 20 and reaches a winding shaft 25 .

That is, the microcapsule paper 37 coming out from the lower part of the cartridge 13 is guided by the feed roller 15 and the tie roller 17, passes below the exposure table 19, and then passes through the pressure developing device 20.
supplied to Thereafter, the microcapsule paper 37 that has passed through the pressure developing device 20 is guided to a peeling roller 23 and a meandering adjustment roller 24, and then wound onto a winding shaft 25. The unexposed microcapsule paper 37 after leaving the cartridge 13 is maintained in an unexposed state by the light shielding cover 16.

The conveyance speed of the microcapsule paper 37 is controlled to be constant by the capsule paper feed roller 22, and is made to match the moving speed of the document platen glass 2, so that the microcapsule paper 37 when passing through the exposure table 19 is In this case, latent images of predetermined lines of the original are sequentially formed.

Further, a developer paper cassette 32 containing cut paper type developer paper 38 is provided below the pressure developing device 20, and the developer paper 38 is taken out one by one by a half-moon roller 33, and transferred to the developer paper roller 34 and the resist. After the leading end is aligned by the gate 35, the paper is transported to the paper entrance of the pressure developing device 20.

A sensor 39 is installed below the paper inlet of the pressure developing device 20 to detect the feeding and end of color developer paper.

Therefore, the pressure developing device 20 includes the microcapsule paper 37.
The color developer paper 38 and the color developer paper 38 are supplied in a state where they are in close contact with each other and are integrated. The pressure developing device 20 is composed of a small diameter roller 21 and a backup roller 31. Microcapsule paper 37
The microcapsule surface on which the latent image is formed and the developer-coated surface of the color developer paper 38 are in contact with each other on the inside, and are sandwiched between the small diameter roller 21 and the backup roller 31 and pressure is applied. This pressure destroys the unexposed microcapsules and forms an image on the developer paper 38.

The small diameter roller 21 and backup roller 31 of the pressure developing device 20 are configured to be openable and closable, and the opening and closing operations are performed by rotating a cam (not shown) in contact with the backup roller 31 by a pressure roller opening/closing motor 50. It will be done.

The microcapsule paper 37 and the color developer paper 38 that have come out of the pressure developing device are conveyed by a capsule paper feed roller 22, and the microcapsule paper 37 and the color developer paper 38 are separated by a peeling roller 23 in an upward direction and a color developer paper 38 in an orthogonal direction. After color development is promoted by the heat fixing device and an image is formed on the color developer paper 38, the paper is conveyed to the paper discharge tray 27 with the image side facing up. The heat fixing device is composed of a hollow heat roller 29 having a heater 30 inside and a color developing paper feed roller 28.

The separated microcapsule paper passes through a meandering adjustment roller 24 and is wound around a winding shaft 25.

The heat roller 29 and the color developing paper feed roller 28 can be driven separately from the series of capsule paper transport means.

Furthermore, it is also possible to rewind the capsule paper in the opposite direction to the direction in which it is conveyed in a series of image processes.

The operation of the device constructed as described above will be explained below.

Now, after opening the document platen cover 1 and placing the original on the document platen glass 2, if you press the start button (not shown), the document platen glass 2 will first move to the right in FIG. The base glass 2 stops at a position where the left end faces the light source (step 1). After that, with the halogen lamp 3 on, move the original platen glass 2 to the left (
Step 2). The light emitted from the halogen lamp 3 is
After being reflected by the original, the light is reflected by the filter 8, the lens 9, and the two reflecting mirrors 11, and then an image is formed on the microcapsule paper 37 located below the exposure table 19. At this time, the microphone and microcapsule paper 37 are moved to the left on the exposure table 19 at the same speed as the moving speed of the document table glass 2, so the image on the document is formed as a latent image on the microcapsule paper 37. be done.

As the platen glass 2 moves to the left, the half-moon roller 33 takes out the developer paper 38 from the developer paper cassette 32, and the developer paper roller 34 and the registration gate 35 align the leading end and transport it (step 3).

After that, when the feeding of the color developer paper 38 is confirmed by a sensor 39 installed below the paper inlet of the pressure developing device 20, the color developing paper 38 is supplied to the pressure developing device 20 in a state where it is overlapped with the exposed microcapsule paper 37. Ru.

At this time, so that the image appears near the tip of the developer paper 38,
After the sensor 39 detects the leading edge of the color developer paper 38, the color developer paper 3
8 is conveyed by a predetermined amount, the pressure roller opening/closing motor 50 is started to rotate, and when the leading edge of the developer paper 38 enters between the small diameter roller 21 and the backup roller 31, both rollers are controlled to close. The pressure roller opening/closing motor 50 is stopped (step 4).

Next, when the sensor 39 detects the end of the developer paper 38, after detecting the end and conveying the developer paper 38 by a predetermined amount, the pressure roller opening/closing motor 50 starts to rotate, and the end of the developer paper 38 is moved to the small diameter roller. 21 and the backup roller 31, both rollers are released, and after the release, the pressure roller opening/closing motor 50 is stopped (step 5).

By the above-described pressure development operation, the latent image on the microcapsule paper 37 is developed and transferred onto the developer paper 38.

After that, the microcapsule paper 3 that has passed through the developing device 20
7 are sequentially wound up on the winding shaft 25, but when the end of the developer paper 38 passes the peeling roller 23 after the development is completed,
The capsule paper 37 is rewound so that the beginning of the part where no image is formed near the peeling roller 23 is rewound to the tip A of the area under the exposure table 19 where exposure is performed (step 6), and the developer paper 38 is then transferred to the heat fixing device. After being heated and ejected from the copying machine 40 (step 7), when the document table glass 2 finishes moving to a position where its left end faces the light source, copying of the document is completed and the halogen lamp 3 is turned off. I am made to do so.

Note that whether the end of the developer paper 38 passes through the peeling roller 23 is determined based on the conveyance amount after the end of the developer paper 38 passes the sensor 39 .

[Effects of the Invention] As is clear from the detailed description above, according to the present invention, the light-sensitive pressure-sensitive recording sheet after pressure development and the color developer sheet are transported by separate drives, so that the color developer sheet is transported more easily. This avoids the accompanying conveyance of unused portions of the photosensitive and pressure sensitive recording sheet, makes effective use of the recording sheet, and allows the next image process to begin by conveying the developing sheet while rewinding the photosensitive and pressure sensitive recording sheet. The time taken can be shortened.

[Brief explanation of the drawing]

1 to 3 show embodiments embodying the present invention. FIG. 1 is a schematic sectional view of a copying machine to which this embodiment is applied, and FIG. 2 is a schematic cross-sectional view of a copying machine to which this embodiment is applied. FIG. 3, a flowchart diagram of an example image forming process, is a block diagram of the drive system. In the figure, 20 is a pressure developing device, 22 is a feed roller, 28 is a developer paper roller, 37 is a microcapsule paper, 38 is a developer paper, and 40 is a copying machine.

Claims (1)

[Scope of Claims] 1. A long light-sensitive pressure-sensitive recording medium sheet, a color developer sheet for making visible a latent image formed on the light-sensitive pressure-sensitive recording sheet, and the light-sensitive pressure-sensitive recording sheet. and a pressure developing means for stacking and developing the color developer sheet under pressure, and a conveyance means capable of driving separately the conveyance of the light-sensitive pressure-sensitive recording sheet and the conveyance of the color developer sheet after the pressure development. . An image forming apparatus characterized in that, after the developer paper and the photosensitive pressure-sensitive recording sheet are separated, the photosensitive pressure-sensitive recording sheet is rewound. 2. The image forming apparatus according to claim 1, further comprising a pressure roller opening/closing means for opening and closing the pressure roller of the pressure developing means, and opening and closing the pressure roller after pressure development is completed. Features of the image forming device. 3. In the image forming apparatus according to claim 2, the light-sensitive pressure-sensitive recording sheet after the pressure development unit is rewound to an area where exposure is performed, or to an end of that area that is far from the pressure development unit. image forming apparatus.