JPH03142461A - Pressure developing 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 [Field of Industrial Application] The present invention relates to a pressure developing device such as a copying machine or a printer using pressure-sensitive recording paper.

[Prior Art] Conventionally, in a pressure developing device, the pressing members arranged in parallel in the axial direction of the roller are each equipped with a spring having the same spring constant, and an appropriate pressure distribution can be achieved by adjusting the pressing force after assembly. It was occurring.

[Problems to be Solved by the Invention] However, adjustments after assembly are complicated and the number of parts is large, making it difficult to reduce costs.

The present invention has been made to solve the above-mentioned problems, and the suppressing members arranged in line in the axial direction of the roller are members that generate different pressing forces predetermined depending on the pressing position. The purpose of the present invention is to provide a pressure developing device that requires no adjustment and is inexpensive.

[Means for Solving the Problems] In order to achieve this object, the pressure developing device of the present invention has a pressure developing device in which the pressing members arranged in line in the axial direction of the roller apply different pressures predetermined according to the pressing positions. It is equipped with a member that generates pressure.

[Operation 1] In the present invention having the above configuration, the microcapsule sheet and the color developing sheet are overlapped and passed between both rollers. The second roller is pressed by each pressing member, and each part is equally pressed in the direction of the first roller. In other words, there is less distortion around the point of contact with both sheet ends. In addition, in this device, distortion occurs when the pressure points of each pressing member on the second roller are the peaks of displacement, but this distortion is caused by the color developing sheet (generally thicker than the microcapsule sheet and having a buffering capacity) that is in pressure contact with the second roller. Since the microcapsule sheet is absorbed by a high amount of water, a -like pressure is applied to the microcapsule sheet, and color unevenness does not occur. Also, wrinkles etc. do not occur for the same reason.

[Example] Hereinafter, in order to explain the present invention more specifically, an example will be given and explained.

FIG. 2 is a schematic sectional view of a photosensitive and pressure sensitive copying machine 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 and pressure-sensitive copying machine 40 is composed of a document table glass 2 and a document table cover 1, the top plate of which is movable in the left and right directions, and a desired document is placed face down on the document table glass 2. It can be placed in 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 front 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 platen glass 2 and is reflected by the original placed on the lever. A document table cover 1 that covers the top surface is provided.

Doors 51 and 52 for maintenance (for example, replacing the cartridge 13, clearing a jam, etc., which will be described later) are attached to the lower part of the document table glass 2 and the left side surface in the figure.

Microswitches 53 and 54 are installed on this door,
Its opening and closing can be detected.

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 to reflect the light that is not directly directed toward the original and use 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 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 mounting plate 10, and allows minute angle adjustment with respect to the optical path.

The light focused by the lens 9 is turned 180° by two reflecting mirrors 11 and is imaged on a 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 placed under the document table glass 2 while being wound around the cartridge shaft 14.
It is housed in a removable cartridge 13, one end of which reaches a winding shaft 25 via a number of rollers and a pressure developing device 20.

That is, the microcapsule paper 37 coming out from the lower part of the cartridge 13 is transferred to the feed roller 15 and the Tyco roller 1.
After passing under the exposure table 19 guided by the photosensitive member 7, the photosensitive material is supplied to the pressure developing device 20. 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 is then guided to a winding shaft 25.
rolled up. The unexposed microcapsule paper 37 after leaving the cartridge 13 is maintained in an unexposed state by the light shielding cover 16.

The transport 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 is Latent images of predetermined lines of the document 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 the developer paper cassette 38 is taken out one by one by a half-moon roller 33, and the developer paper cassette 32 is moved to the developer paper roller 34 and the resist gate. After the leading end is aligned by -1.35, the paper is conveyed to the paper inlet of the pressure developing device 20.

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.

This pressure developing device 20 is shown in an enlarged view in FIG.

The 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 integrally sandwiched between two rollers. Hereinafter, the side in contact with the microcapsule paper 37 will be referred to as the first roller, and the side in contact with the color developer paper 38 will be referred to as the second roller. 1st
The roller 21 is connected to a cam follower 56 via a backup roller 55. This cam follower 56 comes into contact with a cam 57, and as the cam 57 rotates, it moves in a direction to open and close both rollers 21 and 31. Further, as shown in FIG. 3, a large number of backup rollers 58 are arranged in line in the axial direction of the second roller 31, and each is connected to a spring 59. These springs 59 have a predetermined spring constant so as to generate an appropriate pressing force at each position. Specifically, the central spring 59c
has the lowest spring constant, and the spring constant increases toward the outside.

The cam 57 is rotated by a step motor 63 shown in FIG. This step motor 63 has a drive circuit 64
and is connected to a microcomputer 66 via an interface 65.

Further, an output terminal of an OR gate 67 and a solenoid 70 are connected to this interface 65. Each input terminal of this OR gate 67 is connected to the micro switch 53.
．． 54. Micro switch 53.54
makes each input terminal of the OR gate 67 high when the fields 51 and 52 open. Further, the solenoid 70 is connected to the capsule paper feed roller 22 located downstream of the pressure developing device 20.
and opens the capsule paper feed roller 22 upon excitation.

Normally, the cam is displaced in the direction of opening the first and second rollers 21.31 under the control of the microcomputer 66, so that a gap of about 1 mm exists between the two rollers. The developer paper 38 is the microcapsule paper 37.
When the rollers 21 and 31 enter the gap, the cam 57 rotates and is displaced in a direction that closes both rollers 21 and 31. Then the first
Then, the second rollers 21 and 31 are closed, and both papers 37 and 38 are pressurized. This pressure destroys the unexposed microcapsules and forms an image on the developer paper 38.

Furthermore, when the output of the OR gate 67 becomes high, the microcomputer 66 controls the cam 57 in the direction of opening the first and second rollers 21, 31 regardless of the states of the two sheets. At the same time, the solenoid 70 is energized to open the capsule paper feed roller 22.

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.

The separated microcapsule paper is moved to a meandering adjustment roller 24.
The film is then wound around the winding shaft 25.

The operation of the device configured 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. After that, with the halogen lamp 3 lit,
Move the document table glass 2 to the left. The light emitted from the halogen lamp 3 is reflected by the original, then reflected by the filter 8, lens 9, and two reflection mirrors 11, and then transferred to the microcapsule paper 37 located below the exposure table 19.
imaged on top. At this time, the microcapsule paper 37 is 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 microcapsule paper 37
An image on the original document is formed as a latent image on 7.

As the document platen glass 2 moves to the left, the color developer paper 38 is taken out from the color developer paper cassette 32 by the half-moon roller 33, and is supplied to the pressure developing device 20 in a state where it is overlapped with the exposed microcapsule paper 37. The latent image on the microcapsule paper 37 is developed and transferred onto the developer paper 38.

The operation of the pressure developing device 20 at this time will be explained.

When both sheets 37 and 38 enter between the first roller 21 and the second roller 31, the cam 57 rotates and the two rollers are brought into pressure contact with the spring 59 being displaced by 1 mm. Second
Since the roller 31 is pressed at the contact portion of each backup roller 58, distortion occurs in the second roller 31 with the contact portion being a peak of displacement. However, this distortion is minute and is absorbed by the support of the color developing paper 38, which is relatively thick and has high buffering properties. Therefore, the pressure applied to the microcapsule paper 37 is approximately constant, and the image transferred onto the color developing paper 38 does not have color unevenness, wrinkles, or the like.

Thereafter, the developing paper 38 is thermally fixed by a thermal fixing device and then discharged from the copying machine 40 . On the other hand, pressure developing device r11
The microcapsule paper 37 that has passed through the paper 20 is sequentially wound around the winding shaft 25. When the document platen glass 2 finishes moving to a position where its right end faces the light source, copying of the document is completed and the halogen lamp 3 is turned off.

When a user opens one or both of the doors 51, 52 in order to detect a paper jam or to replace the cartridge 13, a micro switch 53, 54 attached to the door 6 is activated.
output becomes high. Then, the output terminal of the OR gate 67 becomes high. The microcomputer 66 detects this via the interface 65 and controls the step motor 63 and the solenoid 70 to move the first roller 21,
Open the space between the second rollers 31 and the feed roller 22. Therefore, the user can remove the paper jam or change the cartridge 13 without any special consideration.

[Effects of the Invention] As is clear from the above detailed description, according to the present invention, it is possible to obtain a uniformly formed image without making adjustments after assembly, and the configuration of the apparatus is also simplified.

[Brief explanation of the drawing]

1 to 4 show embodiments embodying the present invention, FIG. 1 is a sectional view of a pressure developing device according to an embodiment of the present invention, and FIG. 2 is a sectional view of the pressure developing device described above. FIG. 3 is a cross-sectional view of a photosensitive and pressure-sensitive copying machine using the above pressure developing device.
FIG. 4, viewed from the direction of arrow A in the figure, is a block diagram of a circuit that controls the pressure developing device. In the figure, 21 is a first roller, 31 is a second roller, 37 is a microcapsule sheet, 38 is a color developing sheet, and 59 is a pressing member. Patent/Patent Applicant Brother Industries, Ltd. President 1 Yoshifusa Yasui

Claims (1)

[Claims] A first roller (21), a second roller (31), and a plurality of pressing members (59a) arranged in line in the axial direction of the second roller (31) and pressing the second roller toward the first roller.
and the pressing members (59a to 59e).
) is comprised of members that generate predetermined different pressing forces depending on the pressing position.