JPH02204238A - Image forming device - Google Patents

Abstract

PURPOSE:To freely draw out sheets and facilitate the maintenance by detecting door opening for maintenance with a detecting means, and releasing the pressed contact between rollers pair with an opening/closing mechanism according to the detection. CONSTITUTION:When a user opens one of doors 51, 52 or both by reason of generation of paper jam or exchange of a cartridge 13, output of micro switches 53, 54 mounted on the respective doors becomes high. Hereby, a micro computer detects it, and opens between a first roller 21 and a second roller 31, and be tween rollers 22 through a control mechanism. Consequently, a user can release a paper jam or exchange a cartridge 13, without care. Thus, as releasing of the pressed contact is performed by interlocking with opening of the door for maintenance, operation of special switches for the purpose is unnecessary for an user.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus having a mechanism for conveying a sheet while sandwiching it between at least one pair of rollers.

[Prior Art] Conventionally, a pair of rollers has been used as a sheet conveyance mechanism in an image forming apparatus. The paper is conveyed by this pair of rollers, and processes such as image formation and development are sequentially performed along the conveyance path.

Furthermore, it is known that a door is provided in the case of the device or the case of each unit provided in the device for maintenance such as clearing sheet jams and replenishing sheets.

[Problems to be Solved by the Invention] However, since the roller pair is in pressure contact and its shaft is connected to a motor, it does not rotate freely when the power is off. Therefore, when performing maintenance by opening the door, particularly when maintaining the paper feeding and paper conveyance systems, the operator is required to have advanced skills. Further, if an attempt is made to forcibly pull out the paper sandwiched between the pair of rollers, the paper may be torn and pieces of the paper may remain in the apparatus, causing a malfunction of the apparatus or a new paper jam.

The present invention has been made to solve the above problems,
The purpose is to provide an image forming apparatus that can be easily maintained by releasing the pressure contact between the pair of rollers when the door is opened.

[Means for solving section selection] In order to achieve the above object, the present invention provides at least one pair of rollers disposed across a sheet conveyance path, a door that is opened during maintenance, and a door that is opened during maintenance. The device is characterized in that it has a detection means for detecting that the roller pair has been turned, and an opening/closing mechanism that releases the pressure contact between the pair of rollers in response to the detection by the detection means.

[Operation] In the apparatus of the present invention having the above configuration, when the user opens the door for maintenance, the detection means detects this, and the opening/closing mechanism releases the pressure contact between the pair of rollers in response to the detection.

The user can freely pull out the seat, making maintenance a breeze.

[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 horizontal direction.A desired document is placed face down on the document table glass 2. Can be placed in any condition. 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 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.

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 attachment plate 1o, and allows minute angle adjustment with respect to the optical path.

The light focused by the lens 9 is deflected by 180" by two reflecting mirrors 11, and is imaged on the microcapsule paper 37 that is closely positioned below the exposure table 19. The two reflecting mirrors 11 are mirrors. The mirror is fixed to a 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 wound around the cartridge shaft 14 and housed in a removable cartridge 3 disposed below the document table glass 2.
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 transferred to the feed roller 15. After passing under the exposure table 19 guided by the Tyco roller 17, it is supplied to the pressure developing device 20. After that, the pressure developing device 20
The microcapsule paper 37 that has passed through the peeling roller 2
3 and the meandering adjustment roller 24, and then wound onto the 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 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 then 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.

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 fixing 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. Thereafter, the side in contact with the microcapsule paper 37 is designated as the 10th
-A, the side in contact with the color developer paper 38 is referred to as 20th-A. 1st
The 0-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 the direction of opening and closing both rollers 21, 31. Further, as shown in FIG. 4, a large number of backup rollers 58 are arranged in line in the axial direction of the 20th roller 31, and each is connected to a spring 59. The biasing force of these springs 59 is adjusted by screws 60, respectively.

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
sets each input terminal of the OR gate 67 to 11i when the fields 51 and 52 open. Further, the solenoid 70 is connected to the capsule paper feed roller 2 located downstream of the pressure developing device 20.
2 and opens the capsule paper feed roller 22 upon excitation.

Normally, the cam is displaced in the direction of opening the first and twentieth 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 20th rollers 21 and 31 are closed, and both sheets 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 twentieth rollers 21 and 31, regardless of the state 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 turned on,
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.

Both papers 37.38 are 10th-ra 21. When the roller enters between the 20th roller and the roller 31, the cam 57 rotates and the spring 59 is displaced by 1 mm, bringing the two rollers into pressure contact. Second
Since the 0-roller 31 is pressed at the abutting portion of each backup roller 58, the 20th-roller 31 generates a strain in which the abutting portion becomes 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 20
The microcapsule paper 37 that has passed through 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 to detect a paper jam or to replace the cartridge 13, the outputs of the microswitches 53, 54 attached to each side become high. Then, the output terminal of the OR gate 67 becomes high. The microcomputer 66 detects this via the interface 65, and the step motor 6
3 and the solenoid 70 to control the 10th-ra 21. Open the space between the 20th roller and the roller 31 and the feed rollers 2 and 2. Therefore, the user can release the paper jam or replace the cartridge 13 without any special consideration.

[Effects of the Invention] As described in detail above, according to the present invention, the pressure contact between the roller pair is released during maintenance, so maintenance can be easily performed. Furthermore, since the pressure contact is released in conjunction with the opening of the maintenance door, the user does not need to operate a switch or the like for this purpose.

[Brief explanation of the drawing]

The drawings are for explaining one embodiment of the present invention, and FIG. 1 is a block diagram explaining the electrical configuration of the device of this embodiment, FIG. 2 is a sectional view explaining the overall configuration of the device, and FIG. 3 is an enlarged sectional view of the pressure developing device of the present apparatus, and FIG. 4 is a view of the pressure developing device viewed from the direction of arrow A. In the figure, 21 and 31 are the 10th and 20th rollers corresponding to the roller pair, 22 is the capsule paper feed roller corresponding to the roller pair, 53 and 54 are microswitches constituting the detection means, and 56 is the opening/closing mechanism. cam follower, 57
66 is a microcomputer that constitutes the opening and closing mechanism; 70 is a solenoid that constitutes the opening and closing mechanism.

Claims (1)

[Claims] 1. In an image forming apparatus including at least one pair of rollers disposed across a sheet conveyance path and a door that is opened during maintenance, detecting that the door is opened. An image forming apparatus comprising: a detection means; and an opening/closing mechanism that releases the pressure contact between the pair of rollers in response to detection by the detection means.