JPH02201368A - Image forming device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application 1] The present invention is directed to copying lf! Regarding image forming apparatuses such as the above, more specifically, a photosensitive pressure sensitive recording medium (photosensitive microcapsule paper) on which a latent photoimage based on image information has been formed and a color developing medium (color developing paper) are superimposed and pressure developed. The present invention relates to an image forming apparatus of a type that forms a visible image on the surface of a color developing medium.

[Prior Art 1] Conventionally, as an example of this type of image forming apparatus, a roll-shaped photosensitive microcapsule paper is pulled out and a latent image corresponding to the original image is formed on the surface by exposure, and then the exposed surface is There is known a structure in which a visible image is realized on the surface of a color developing medium by overlapping cut paper-like color developer paper and applying pressure by a pressure developing means consisting of a pair of pressure rollers.

In this case, the pressure roller is normally open and waiting in order to avoid contamination of the roller surface due to careless crushing of the microcapsule paper, and the developer paper is moved in synchronization with the conveyance speed of the microcapsule paper. It is configured such that the image forming apparatus is fed in this state, and then pressure development is proceeded by closing both pressure rollers.

[Problems to be Solved by the Invention] However, in the case of a device having a function of increasing/decreasing the exposure amount of the microcapsule paper surface or enlarging/reducing the image by adjusting the copying magnification, the transport speed of the microcapsule paper In this case, the conveyance speed of the developer paper is synchronized with that of the microcapsule paper, but the nip timing of the pressure roller is not changed, so there is a difference in the time at which pressure starts. occurs. For this reason, for example, if pressure is started before the color developer paper is fed in, only the microcapsule paper will be crushed by itself and the pressure roller surface will be soiled, and conversely, pressure will be started with too much color developer paper fed in. If this happens, the leading edge of the developer paper may not be developed.6Also, when enlarging or reducing the exposure start position of the microcapsule paper surface is changed, but in this case, the overlapping position of the exposed surface and the developer paper is changed. There was also the inconvenience that the discs were misaligned.

The present invention has been made to solve the above-mentioned problems, and by optimizing the timing of opening and closing of pressure members such as ten rollers, beautiful images with reproducibility can be obtained, and it is possible to obtain beautiful images with reproducibility. Image formation that can avoid stains etc. 5! The purpose is to provide a location.

[Means for Solving the Problems] In order to achieve the above objectives, the image forming apparatus of the present invention has the following features:
(a) a means for transporting a photosensitive pressure sensitive recording medium on which a photolatent image based on image information has been formed; A means for conveying a color developing medium in which a latent optical image is realized as a visible image;
c) Pressure developing means in which two-month pressure members are arranged facing each other so as to be openable and closable in order to perform pressure development on the direct photosensitive pressure-sensitive recording medium and the color developing medium in a superimposed state; A color developing medium stop system a1 that stops the direct color developing medium when the leading edge of the direct color developing medium is carried between the pressure members when the pressure developing means is in an open state. and (e) regular closing for closing the pressure developing means at a timing when it is determined that the exposure start edge of the surface of the photosensitive pressure sensitive recording medium coincides with the leading edge of the color developing medium in the pressure developing means. In this case, the regular closing timing refers to the separation of the conveyance path from the exposure start tip position of the surface of the photosensitive and pressure sensitive recording medium to the tip edge of the color developing medium in the pressure developing means at the time of starting exposure. It is controlled by the timing time divided by the transport speed of the photosensitive pressure sensitive recording medium.

[Function] In the image forming apparatus of the present invention having the above configuration, when it is determined that the exposure start edge of the pressure-sensitive recording medium on which the latent image has been formed coincides with the edge of the developing medium between the pressure members. The pressure member closes and development begins.

In this case, the color developing medium is sent in advance between the pressure members and is on standby. Therefore, there is no need to synchronize the conveyance of the photosensitive pressure sensitive recording medium and the color developing medium, and reliable overlapping can be achieved.

[Example] Hereinafter, in order to explain the present invention more physically, examples will be given and explained.

FIG. 2 is a schematic sectional view of a photosensitive and pressure sensitive copying machine that is capable of full color copying. Incidentally, photosensitive paper (consisting of microcapsule paper and color developer paper) that enables such copying has been proposed in Japanese Patent Application Laid-open No. 88739/1983, etc.
It will not be detailed here.

As shown in the figure, the photosensitive and pressure-sensitive copying machine 40 is composed of an original platen plus 2 and an original platen cover 1, the top plate of which is movable in the horizontal direction. It is placed face down. Further, a light source consisting of a halogen lamp 3 extending in a direction perpendicular to the direction of document table glass 2 and a semi-cylindrical reflector [4] arranged to surround the halogen lamp 3 and light emitted from the halogen lamp 3 are provided at the bottom of the document table glass 2. In order to utilize the light to illuminate documents with high efficiency, a beam 7 and a reflector 5 are arranged to the left of the light source. Further, on the right side of the halogen lamp 3, a 77-channel 6 and a louver 7 for introducing air from the outside are provided, so that air can be efficiently applied to the document table plus 2. The light irradiated by the halogen lamp 3 and reflected from the original placed on the original platen glass 2 is filtered into the filter 8.
Pass through and enter Shinzu 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 mounting plate 10, and allows minute angle adjustment with respect to the optical path. Furthermore, the lens 7::9 is movable in the vertical direction so that the copying magnification can be changed, and is raised and lowered by the action of the lens lifting device c51 shown in FIG. The light 1 condensed by the lens 9 is turned 180° by two reflecting mirrors 11, 11, and is imaged on the microcapsule paper 37 closely positioned below the exposure table 19. Double reflective mirror 1
1.degree. 11 is fixed to a mirror mounting plate 12, and adjustment of the optical path length and focus is performed by fine adjustment of the mirror mounting plate 12.

A monochrome microcapsule paper 37 is wound around the cartridge shaft 14 and housed in a removable car disposed below the platen glass 2. 15, Id roller 17
After passing under the exposure table 19, it is supplied to a pressure developing device 20, then guided to a peeling roller 23 and a meandering adjustment roller 24, and wound onto a winding pongee 25. Note that the unexposed microcapsule paper (7) 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 by the capsule paper feed roller 22 connected to the motor 52 shown in FIG. 1, and changes in relation to the moving speed of the document table plus 2 and the magnification magnification.

Therefore, latent images of predetermined lines of the original are sequentially formed on the microcapsule paper 37 as it passes through the exposure table 19.

On the other hand, 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 then transferred to the developer paper roller 34 and the Rennost date. After the leading end is aligned by 35, the paper is transported to the paper entrance of the pressure developing device W120.

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. Pressure developing unit W120 +! It is composed of a first pressure roller 21 and a second pressure roller 31. The microcapsule surface of the microcapsule paper 37 on which the latent image is formed and the color developer coated surface of the color developer paper 38 are in contact with each other on the inside and are integrated into the first pressure roller 21 and the second pressure roller 31. It is squeezed and pressure is applied. Due to this pressure, unexposed microcapsules are ruptured and an image is formed on the color developing paper 38.

The microcapsule paper 37 and the color developer paper 38 that have come out of the pressure developing device are conveyed by the capsule paper feed roller 22, and the microcapsule paper is moved upward by the peeling roller 23, and the color developer paper 3 is transported by the peeling roller 23.
8 are orthogonally separated.

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.

FIG. 3 shows a sectional view of the pressure developing device. 11 pressure roller 21 and fjS2 pressure roller 31 facing it are arranged, and microcapsule paper 37 is placed between them.
and color developer paper 38 are overlapped and passed through. The first pressure roller 21, together with the first back-up roller 41,
It is movably attached to the S17 frame 42. The second pressure roller 31 is a second back-up roller 43
It is also attached to the f527 frame 44. f
The f127 frame 44 has a structure in which the seventh frame itself is movable with respect to the seventeenth frame 42, and its fi structure includes a camshaft 4G having an eccentric cam shape that abuts the seventh frame and the seven troller 45. is the drive rJ shown in FIG.
, 53, and when the peak of the cam reaches the '5#: position between the 7th roller and the 7th roller 45, the 27th rail A44 moves toward the rjSl 7th rail A42 side, and along with this, the second pressure roller 231 also moves. At this time, since the first pressure roller 21 is pressed by the pressure spring 47 via the first back-up roller 41, the first pressure roller 21 and the second pressure roller 31 are pressed by the pressure force of the pressure spring 47. It becomes pressure-welded.

Furthermore, when the valley portion of the cam reaches the contact position with the seventh frame 7 troller 45, the 27th frame 44 is connected to the 17th frame 4.
1, the pressure contact state between the first pressure roller 221 and the second pressure roller 31 is released, and a gap is created between the pressure rollers to feed the color developing sheet 38.

Next, a driving source 5 that rotates the pressure developing camshaft 46
3 and its control device 50 will be explained with reference to FIG.

The drive source 53 is connected to a central processing unit (hereinafter referred to as CPU) 55 via an interface circuit 54. A sensor 56 is further connected to this interface circuit 54. This sensor 56 is arranged upstream of the 10th line 21 and the 20th line 31, and is located at the time when the leading edge of the color developer paper 38 passes through the sensor 56 and at the time when the rear end of the color developer paper 38 passes through the sensor 56. sense.

Furthermore, the lens lifting device W151 and the motor 52 are connected to the interface circuit 54. The CPU 55 controls the lens lifting device Wt51 and the motor 52 to realize exposure at a desired magnification. Further, connected to the CPU 55 are a rung access memory 57 as a work area for the CPU, and a read-only memory 58 in which the processing procedures of the CPU 55 are written.

The rg4ra timing of the first pressure roller 21 and the second pressure roller 31 of the pressure developing device 20 configured as above will be explained below.

When the exposure is completed, the microcapsule paper 37 and the color developer paper 38 are overlapped and conveyed. This conveyance speed is determined by the CPU 55 in relation to the magnification and the like determined by the position of the lens 9. and the CPU
55 is the motor 52 in relation to the determined transport speed.
is controlled to rotate the capsule paper feed roller 22.

The color developing paper 38 is not synchronized with the rotational speed of the capsule paper feed roller 22, but is sent to the pressure developing device 20 exclusively at a constant speed. At this time, when the leading edge of the color developing paper 38 is detected by the sensor 56, the detection signal is sent to the CPU 55, and a known delay timer is activated to cause the leading edge of the color developing paper 38 to be detected by the pressure member 21 of the pressure developing device fi20. It is stopped when it is fed a little between 31 and 31.

On the other hand, the ROM 58 of the control I blade device 0 stores in advance the withdrawal distance from the exposure start position of the surface of the microcapsule paper 37 to the leading edge of the color developing medium 38 in the pressure developing device W120 according to each copying magnification. At the same time as exposure started, the encoder counter of the AM unit feed printer (all of which are well known) was cleared, and the count value reached the predetermined exposure speed based on the 70-chart in Figure 4. By the way, by driving the opening/closing drive source 53 between the two shoulder pressure members 21.31 of the pressure developing device 20, both the shoulder pressure members 21.31 are caused to double. This nip timing is the best microcapsule paper 37
It is the seventh generation when the exposure start end of the image coincides with the leading edge of the color developing paper 38.

Note that various other modifications of the present invention are possible.

[Effects of the Invention] As detailed above, in the image forming apparatus of the present invention, the exposure start position on the surface of the photosensitive pressure sensitive recording medium and the tip ya green of the color developing medium are always constant, so that images without image shift can be produced. is obtained.

In addition, since the pressure member does not apply pressure only to the photosensitive pressure-sensitive recording medium, the microcapsules supported on the surface of the recording medium are not inadvertently crushed and the pressure member is not soiled. It provides high-quality images and is easy to maintain.

[Brief explanation of the drawing]

Figures 1 to 8 show one embodiment of the present invention.
5] This figure shows the configuration of a control device that controls pressure development in the image forming apparatus of the embodiment, FIG. 2 shows the configuration of this image forming apparatus, and FIG. 3 explains details of the pressure developing apparatus. FIG. 4 is a 70-chart for controlling nip timing in a pressure developing device. In the figure, 21 and 31 are first and second pressure rollers corresponding to the pressure means, 22 is a microcapsule paper feed roller corresponding to the conveyance means, and 53 is a drive source corresponding to the opening/closing means. Natsume 20 Diagram

Claims (1)

[Scope of Claims] 1. A means for transporting a photosensitive pressure sensitive recording medium on which a latent photoimage based on image information is formed; A means for conveying a color developing medium in which a latent optical image is realized as a visible image, and a pair of pressure members that can be opened and closed in order to pressurize and develop the light and pressure sensitive recording medium and the color developing medium in a superimposed state. pressure developing means disposed opposite to each other; a color developing medium stop control means for temporarily stopping the color developing medium when the leading edge of the color developing medium is carried between the pressure members when the pressure developing means is in an open state; Pressure development closing timing control means for closing the pressure developing means at a timing when it is determined that the exposure start edge of the surface of the photosensitive pressure sensitive recording medium coincides with the leading edge of the color developing medium in the pressure developing means. An image forming apparatus comprising: