JPH0420961A - Image forming device - Google Patents

Abstract

PURPOSE:To reduce waste of microcapsule paper to the minimum by discriminating the front and back synchronized with paper feeding timing of a recording paper and controlling exposure operation. CONSTITUTION:When a copying start key is operated, the microcapsule paper 12 is carried. The microcapsule paper 12 with the latent image formed on it is carried to a pressure developing device 22, and synchronized with this, the developing paper 28 of the uppermost position in a paper feeding cassette 29 is carried to the pressure developing device 22 by a paper feeding mechanism 30, and feeding rolls 31a, 31b, and 31c, etc. When the fed developing paper 28 is judged as faced backwards, an output signal is outputted from the front and back detection device and each of a stopping signal to an exposure lamp control device, and a control signal to a photosensitive/pressure sensitive paper carrying control device are inputted from a controller based on this output signal. Then, an exposure lamp 5a is turned off based on the stopping signal fed to a lamp control device.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image forming apparatus that forms an image on recording paper with different light reflection gravity on the front and back sides, and in particular, an image forming apparatus that forms an image on recording paper with different light reflection gravity on the front and back sides, and in particular, an image forming apparatus that forms an image on recording paper with different light reflection gravity on the front and back sides. The present invention relates to an image forming apparatus configured to detect when paper is formed and control image forming processing operations.

[Conventional technology]

Conventionally, various image forming apparatuses have been developed. For example, microcapsule paper, which is a light-sensitive pressure-sensitive paper on which a latent image of an original document is formed by exposure, is pressed against recording paper (color developer paper) and developed. There is an image forming apparatus that forms an image on the surface of the image forming apparatus. Color developer paper, which is generally used as recording paper for such image forming apparatuses, has a base material coated with a predetermined color developer only on one side (surface).

Conventionally, image forming apparatuses using such recording paper have generally not been equipped with any means for identifying the front and back sides of the recording paper. For this reason, even if recording paper is fed with the front and back sides wrong, a series of image forming processes continues as is.

[Problem to be solved by the invention]

However, recording paper is fed with the wrong side facing up,
Even if a series of image forming processes are performed on a recording sheet with the wrong front and back sides, no image will be formed on the recording sheet, and the recording sheet will be wasted. In addition, at the heat fixing stage of image formation,
There has been a problem in that the recording paper adheres to the heat fixing device of the image forming apparatus, causing a paper jam or, in extreme cases, causing a failure of the main unit.

Note that when equipped with a device to identify the front and back sides of recording paper, it is important to control the main unit in the event that paper is fed with the wrong front and back sides, especially for microcapsule paper (light-sensitive and pressure-sensitive paper). come. This means that when the back of the recording paper is identified,
This is because the latent image exposed on the microcapsule paper is wound up without being transferred to the recording paper, resulting in wasteful use of the capsule paper.

The present invention was made to solve the above-mentioned problems, and detects when the recording paper is fed face down and stops exposure, and also transports the microcapsule paper in the reverse direction. An object of the present invention is to provide an apparatus in which wastage of microcapsule paper is reduced as much as possible by rewinding the microcapsule paper to a portion where exposure is stopped.

[Means to solve the problem]

In order to achieve this object, the image forming apparatus of the present invention includes a conveying means for conveying a continuous strip of photosensitive and pressure sensitive paper;
an optical device that exposes the photosensitive pressure sensitive paper based on a document;
An image forming apparatus comprising: a pressure developing device that pressure-develops an image on the recording paper by overlapping and pressurizing the exposed surface of the photosensitive pressure-sensitive paper and the front surface of a recording paper whose front and back surfaces have different light reflectances; , a front/back detection sensor installed upstream of the pressure developing device to detect the front and back sides of the fed recording paper by detecting the light reflectance of the recording paper; an exposure lamp control device that turns off an exposure lamp in response to an output signal indicating that the paper is on the back side; and a light and pressure sensitive paper transport control device that receives the output signal and rewinds the light and pressure sensitive paper to the part where exposure has been stopped. It is something.

[Effect]

According to the present invention having the above configuration, the front and back detection sensors determine whether the recording paper is front or back in synchronization with the timing when the recording paper is fed, and output a signal when it is determined that the recording paper is the back. Then, this output signal is input to the exposure lamp control device as a stop signal and to the photosensitive and pressure-sensitive paper transport control device as a reversal signal to stop the exposure operation and reverse the photosensitive and pressure-sensitive paper to the part where exposure was stopped. You can rewind it by pressing the button.

〔Example〕

Embodiments embodying the present invention will be described below with reference to the drawings.

In the image forming apparatus 1 of this embodiment, as shown in FIG. 2, a microcapsule paper 12 as a photosensitive pressure sensitive paper and a color developing paper 28 as a recording paper are used.

Note that the microcapsule paper 12 used in this example
A large number of microcapsules are coated on the surface. These microcapsules contain a dye precursor that develops color by reacting with a color developer, which will be described later. It is stated in '209 etc.
It is omitted here.

A document table glass 2 and a document table cover 3 are arranged on the upper part of the image forming apparatus 1. A desired document 4 is placed face down on the document table glass 2, and the document table cover 3 is closed.

Below the document table glass 2 in the upper part of the image forming apparatus 1, an exposure lamp 5a, a reflector 5b, and a reflection mirror 8 are provided.
A light source unit 5 equipped with the following is disposed so as to be movable back and forth along an axis 13 extending parallel to the document table glass 2.

This light source unit 5 irradiates light in a line toward the document table glass 2 in a direction perpendicular to the movement direction. This irradiated light then passes through the transparent original platen glass 2.
The original 4 placed on top of this reflects the light downward.

Below the document table glass 2, a mirror portion 9 is provided which is movable and includes reflection mirrors 9a and 9b separately from the light source section 5, and the light reflected from the document 4 is reflected by the reflection mirror 8. ．．
The light beams 9a and 9b are reflected in this order and guided in parallel to the moving direction of the light source section 5.

A normally fixed projection lens 7 and a filter 6 for adjusting the color tone of the copied image are disposed below the document table glass 2, and the light reflected by the reflection mirror 9b is directed to the projection lens 7. incident.

The light projected by the projection lens 7 is reflected by a reflection mirror portion 10 including reflection mirrors 10a and 10b.

An exposure table 11 for exposing the microcapsule paper 12 is arranged on the right side of the reflection mirror 10b, and a reflection mirror 10c for switching the optical path is arranged between the reflection mirror 10b and the exposure table 11. has been done. The image information on the original document 4 is imaged onto the microcapsule paper 12 arranged along the exposure stage 11 to form a latent image.

Further, although the reflecting mirrors 10a and 10b are normally fixed, the optical path length is changed according to a change in the projection magnification m set when enlarging or reducing the size of the latent image formed on the microcapsule paper 12. Therefore, it is configured to be able to move integrally in the axial direction of the shaft 13.

On the other hand, a removable cartridge 15 is disposed in the center of the image forming apparatus 1, and a long microcapsule paper 12 is housed in the cartridge 15 in a state wound around a cartridge shaft 14. ing. With this cartridge 15 set in a predetermined position within the device,
The leading end of the microcapsule paper 12 is pulled out toward the exposure table 11. A tension roller 19 is provided on the right side of the exposure table 11. Further, below the exposure table 11, a feed roller 20 and a dancer roller 21 for tension adjustment are provided.

Furthermore, on the right side of this dancer roller 21, there is a large diameter roller 2.
A pressure developing device 22 having a back-up roller 22a and a backup roller 22b is disposed on the right side of the pressure developing device 22. As will be described later, a pressure developing device 22 is provided to separate the microcapsule paper 12 and color developing paper 28 that are in close contact with each other. A separation roller 23 is provided to separate the cartridge 15 from the separation roller 23 and the cartridge 15.
A winding shaft 24 for winding up the microcapsule paper 12 is disposed between the microcapsule paper 12 and the winding shaft 24 .

As a result, the microcapsule paper 12 coming out from the upper part of the cartridge 15 is guided by the tension roller 19, passes above the exposure table 11, and then moves to the dancer roller 21.
, a pressure developing device 22, and further led to a separation roller 23, and then wound onto a winding shaft 24. Note that the unexposed microcapsule paper 12 after leaving the cartridge 15
is maintained in an unexposed state by the light shielding cover.

A paper feed cassette 29 containing developer paper 28 is installed below the pressure developing device 22 . This color developer paper 28 carries a color developer that develops color by reacting with the dye precursor described above. Therefore, the color developer paper 28 shows a difference in characteristics, particularly in light reflectance, between the front surface on which the developer is supported and the back surface without the developer. A suction cup-type paper feeding mechanism 30 that sucks the color developer paper 28 using negative pressure suction is disposed above the paper feed cassette 29. The color developer paper 28 is fed one sheet at a time by this paper feed mechanism 30. taken out. A feed guide 31d and feed rollers 31a and 31b are provided between the paper feeding mechanism 30 and the pressure developing device 22.

31c is provided, and the color developing paper 28 is conveyed by the feed rollers 31a, 31b, 31c and the feed guide 31d and carried into the pressure developing device 22.

A separation chute 27 to be described later is provided to the right of the pressure developing device 22, a heat fixing device 32 is provided to the right of the separation chute 27, and a heat fixing device 32 is provided to the right of the heat fixing device 32. A paper discharge tray 33 is provided for storing the color developing paper 28 on which an image has been formed.

The image forming apparatus 1 also includes an autoloading mechanism for automatically setting the microcapsule paper 12 on a predetermined transport path within the apparatus.

This is a mechanism that automatically pulls out the leader film portion attached to the tip of the microcapsule paper 12 into the device, transports it inside the device, and winds it around the winding pongee 24. Thereby, the microcapsule paper 12 following the leader film portion is also wound up on the winding shaft 24, and the setting into the apparatus is completed.

To configure this autoloading mechanism, a half-moon roller 17 is provided between the roller 19 and the cartridge 15 for pulling out the leader film section, and a separation chute 27 is provided for guiding the leader film to the winding shaft 24. It is rotatably mounted. An upper winding guide 25 and a lower winding guide 26 are disposed around the winding shaft 24 for winding the league film portion.

A front/back detection sensor 50 shown in FIG. 1 is installed in the conveying path of the color developing paper 28 located upstream of the pressure developing device 22. This front/back detection sensor 50 detects the light reflectance of the color developer paper 28 and determines whether the color developer paper 28 fed to the conveying path is front or back. This front and back sides are detected.

This front/back detection sensor 50 outputs a signal when it determines that the fed color developing paper 28 is face down, and this output signal is input to the controller 51.
The output signal from 1 is sent to the exposure lamp control device 52 that controls the exposure lamp 5a as a stop signal to turn off the exposure lamp 5a, and also to the photosensitive pressure sensitive paper transport control device 53 that controls the transport of the microcapsule paper 12. Each signal is input as a reversal signal for rewinding the paper 12 in the opposite direction by a predetermined amount, that is, to the portion where exposure has been stopped.

That is, the front/back detection sensor 50 detects the fed color developing paper 2.
When it is determined that the paper 8 is facing down, this output signal causes the controller 51, exposure lamp control device 52, and light and pressure sensitive paper transport control device 53 to stop the exposure and also stop the exposure of the microcapsule paper. The film is rewound to the point where it is and waits for the next exposure.

Furthermore, in order to prevent the main body of the image forming apparatus from malfunctioning, a series of image forming processes such as pressure development and heat fixing are not performed on the developing paper 28 that has been fed with the wrong side facing up. , display it on a panel (not shown) via the controller 51, send back the color developer paper 28, and send it back to the discharge path 3.
5 to take it out of the device.

Next, we will discuss the operation of the present image forming apparatus 1 in the second v! J.

This will be explained with reference to FIG.

When the cartridge 15 is set in the image forming apparatus 1,
Autoloading will start.

The half-moon roller 17 rotates several times in the conveying direction from 1@l only at the start of autoloading, and the microcave cell paper 1
The leader farm portion of No. 2 is sent out to the roller 20. Thereafter, the paper is stopped, and subsequent conveyance is performed by driving the rollers 20.

The upper winding guide 25 and the lower winding guide 26 are rotated to the positions shown by the - dotted chain line, and the separation chute 27 is also rotated, so that the leader film part attached to the tip of the microcapsule paper 12 is attached to the winding shaft. It is wrapped around 24.

When this autoloading is completed, the upper winding guide 25, the lower winding guide 26, and the separation chute 27 return to their original positions, and image formation becomes possible.

When the copy start key is operated (Step 5 in Figure 3)
-1) The microcapsule paper 12 is transported (step 5-2). Then, the exposure lamp 5 is turned on, and the reflection mirror 8 and the exposure lamp 5 are exposed to the microcapsule paper 1.
If the transport speed of 2 is v1 and the projection magnification is m, then the moving speed 1
/ mV, and the reflecting mirrors 9a and 9b move at a moving speed of 1/2 mV (step 5-3)
.

The moving speed of the microcapsule paper 12 is determined by the mirror 8.9a.
, 9b, latent images of predetermined lines of the document 4 are sequentially formed on the microcapsule paper 12 as it passes through the exposure table 11. Note that the predetermined speed ratio is predetermined based on the set value of the magnification.

The microcapsule paper 12 on which the latent image has been formed is conveyed to the pressure developing device 22, and in synchronization with this, the uppermost color developing paper 28 of the paper feed cassette 29 is transferred to the paper feed mechanism 30 and the feed roller 31.
a, 31b, 31c, etc., to the pressure developing device 22 (step 5-4).

The developer paper 28 fed to the pressure developing device 22 is determined to be front or back by a front/back detection sensor 50 installed in its conveyance path (step 5-5). If it is determined that the color developer paper is being fed in the normal direction, the microcapsule surface of the microcapsule paper 12 on which the latent image is formed and the developer coated surface (surface) of the color developer paper 28 are located inside. They are sent together to the pressure developing device 22 in a state where they are in contact with each other. The pressure developing device 22 includes a large diameter roller 22a and a backup roller 2.
2b applies pressure (step 5-6). This pressure destroys the unexposed microcapsules,
An image is formed on the developer paper 28. This pressure developing device 1
The microcapsule paper 12 and the color developer paper 28 that have come out of the i22 are separated by a separation roller 23. When it is confirmed that the exposure is completed (step 5-7), the exposure lamp 5 is turned off and returned to the initial position (step 5-8), and the conveyance of the microcapsule paper 12 is stopped. (step 5-9). Further, color development of the developing paper 28 is promoted by the heat roller 32a of the thermal fixing device 32 to form an image, and then the paper is discharged onto the paper discharge tray 33 by the paper discharge roller 32b (step S-10). The separated microcapsule paper 12 is passed through a separation roller 23 and wound onto a winding shaft 24.

On the other hand, if it is determined that the developing paper 28 fed to the pressure developing device 22 is face down (step 5-5), an output signal is output from the front/back detection sensor 50, and based on this output signal, the controller 51 issues an exposure light. A stop signal is input to the lamp control device 52, and a control signal is input to the photosensitive pressure sensitive paper fine control device 53. Then, the exposure lamp 5a is turned off based on the stop signal sent to the lamp control device 52 (step S-11). At the same time, the amount of conveyance of the microcapsule paper 12 starts to be counted (step S-12), and the microcapsule paper 12 and the color developer paper 28 are moved to predetermined positions, that is, to the developer paper take-out position where the operator can easily take them out. It is transported (step S-13) and stopped (step S-14).

Next, the exposure lamp 5 is returned to the initial position (step S-15), and the microcapsule paper 12 is moved to the count O position (!!the position where the light is stopped) by reversing the roller 2o based on the count amount. The film is rewound and waits for the next exposure (state S-16).

Next, an indication that the color developer paper 28 is jammed is displayed (step S-17), and when the color developer paper 28 is removed, the state returns to a state in which it is possible to start.

〔Effect of the invention〕

As is clear from the detailed description above, according to the present invention,
Synchronizing with the timing when the recording paper is fed, a front/back detection sensor determines whether the front or back side is the front side, and when it is determined that it is the back side, the exposure operation is immediately stopped, and the microcapsule paper is rewound to the part where exposure was stopped and then the next one. This has the effect of minimizing waste of microcapsule paper and reducing running costs. Furthermore, since the developer paper is conveyed to a position where it can be easily taken out by the operator, there is also the effect of improving work efficiency.

[Brief explanation of drawings]

1 and 2 show embodiments embodying the present invention, and FIG. 1 shows control 101 by the front/back detection sensor.
2 is a sectional view of the image forming apparatus, and FIG. 3 is a flowchart showing the operation of the image forming apparatus of the present invention. 1... Image forming device, 5a... Exposure lamp, 11.
...Exposure stand, 12...Microcapsule paper, 15...
・Cartridge, 22...Pressure developing device, 23...
Separation roller, 27... Separation chute, 28... Recording paper (developer paper), 32... Heat fixing device, 50... Front/back detection sensor, 51... Controller, 52... Exposure lamp control Device, 53...Photosensitive and pressure sensitive paper conveyance control device. Kuzu I Figure Figure

Claims (1)

[Scope of Claims] A conveying means for conveying a continuous strip of light-sensitive pressure-sensitive paper, an optical device for exposing the light-sensitive pressure-sensitive paper based on a document, and a recording sheet whose front and back surfaces have different light reflectances. An image forming apparatus comprising a pressure developing device that pressure develops an image on the recording paper by overlapping the surface and the exposed surface of the photosensitive pressure sensitive paper and applying pressure, the image forming device being installed upstream of the pressure developing device, A front/back detection sensor detects the light reflectance of the recording paper to determine the front and back sides of the fed recording paper, and an exposure lamp receives an output signal from this detection sensor indicating that the fed recording paper is on the back side. An image forming apparatus comprising: an exposure lamp control device that turns off the light; and a photosensitive pressure sensitive paper transport control device that receives the output signal and rewinds the photosensitive pressure sensitive paper to a portion where exposure is stopped.