JPH0753075Y2 - Image forming device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an image forming apparatus using a long photosensitive recording medium, and more specifically, to a pressure developing unit and an exposing unit after pressure developing. The present invention relates to an image forming apparatus that minimizes the unexposed portion between latent image forming portions on the photosensitive recording medium by rewinding the unexposed portion on the photosensitive recording medium existing before the exposure portion.

[Prior Art] Conventionally, in an image forming apparatus, when some abnormality occurs during operation, the operation stopping means in the apparatus stops all operations.

[Problems to be Solved by the Invention] However, as described above, in order to reduce the unexposed portion on the photosensitive recording medium as much as possible, the unexposed portion existing between the pressure developing portion and the exposed portion after the pressure developing is performed. In the image forming apparatus, the operation of rewinding the image to the front of the exposure unit is generally stopped when any abnormality occurs during the rewinding operation. When the abnormality is repaired and the apparatus returns to normal, the exposure operation for the next image formation is performed at the position of the photosensitive recording medium at the time when the operation of the apparatus where the abnormality occurs is stopped, that is, the pressure developing unit and the exposure unit. It starts from the position where the unexposed portion existing between the two is not returned to the front of the exposed portion. Therefore, the unexposed portion between the next latent image forming portion on the photosensitive recording medium, that is, the portion where the latent image exposed by the exposing portion is formed and the portion where the latent image is formed last time is increased and is not used. There is a problem that the lining cost becomes high because the number of parts increases.

The present invention has been made to solve the above-mentioned problems, and when an abnormality occurs while rewinding the unexposed portion of the photosensitive recording medium to the front of the exposure portion, the abnormality causes the rewinding operation. If it is an abnormality that does not affect your
An object of the present invention is to provide an image forming apparatus capable of minimizing the unexposed portion of the photosensitive recording medium and reducing the lining cost by continuing the rewinding operation before the abnormality occurs.

[Means for Solving the Problem] In order to achieve this object, in the image forming apparatus of the present invention, when an abnormality occurs in the apparatus when the photosensitive recording medium is conveyed in the reverse direction by the conveying means, the abnormality is caused by the photosensitive recording medium. And a judging means for judging whether or not there is an abnormality which hinders the backward conveying operation of the above, and when the judging means judges that the abnormality does not hinder the backward conveying operation of the photosensitive recording medium, And a transport control unit for continuing the reverse transport operation before the abnormality by the transport unit.

[Operation] According to the image forming apparatus of the present invention having the above configuration, even if an abnormality occurs during the backward conveying operation of the photosensitive recording medium by the conveying means after development, the abnormality hinders the backward conveying operation. When the determining unit determines that the abnormality does not occur, the transport control unit causes the transport unit to continuously perform the backward transport operation before the abnormality occurs.

[Embodiment] An image forming apparatus according to the present invention will be described below with reference to FIG. 1 showing a schematic configuration of an embodiment of a light and pressure sensitive copying machine capable of forming a so-called full-color image.

In the light and pressure sensitive copying machine 1 (hereinafter, referred to as "copying machine 1" for simplification) according to the present embodiment, a photosensitive recording medium, that is, a photosensitive paper composed of microcapsule paper as pressure sensitive paper and color developing paper is used.

A movable platen glass 2 is provided on the top plate of the copying machine 1.
And a document table cover 3 are provided, and the document 4 is set on the document table glass 2 in a state of being face down.

A light source 5 such as a halogen lamp and a semi-cylindrical reflecting mirror is arranged in the upper region of the copying machine 1. The light source 5 is a hole (irradiation light passage hole) formed on the upper surface of the copying machine 1.
Light is radiated in a line shape toward the original platen glass 2 through this, and the emitted light is transmitted through the transparent original platen glass 2. That is, the light emitted from the light source 5 is reflected by the original 4 set on the original table glass 2, and the original 4 is moved and the original 4 is exposed and scanned.

The filter 6 receives the light reflected from the original 4 and adjusts the color tone of the copied image. The projection lens 7 receives the light whose color tone has been adjusted by the filter 6, and projects the light onto the pair of reflection mirrors 8 and 9. The pair of reflection mirrors 8 and 9 are attached to a mirror attachment plate, and the optical path length and the focus are adjusted by finely adjusting the attachment position of the mirror attachment plate. The pair of reflection mirrors 8 and 9 receives the light projected by the projection lens 7, changes the direction of the light as shown in FIG. 1, and is positioned along the exposure table 10 as described later. An image is formed on the part of the long microcapsule paper 11 that is present.

On the other hand, the long-sized microcapsule paper 11 described above is accommodated in the cartridge 12b which is detachable from the copying machine main body 1 while being wound around the cartridge shaft 12a. In the vicinity of the outlet of the microcapsule paper 11 in the cartridge 12b, a moving state detecting means, that is, a paper break sensor.
126 are provided. The paper break sensor 126 indicates that the remaining amount of winding on the cartridge shaft 12a of the microcapsule paper 11 is 0
It is configured to detect whether or not it has become a predetermined output signal.

A leader portion having a predetermined length is attached to one end portion of the microcapsule paper 11, and a feed roller 14a, a guide roller 14b, a drive shaft 22 opened / closed by a drive shaft moving motor (not shown), Dancer roller 24, feed roller 14c
Through the pressure developing device 13, the separating mechanism 14d, and the final shaft 23 opened / closed by the final shaft moving motor (not shown) to reach the take-up shaft 15 to which the automatic paper feed lever 202 is attached. ing. That is, the microcapsule paper 11 ejected from the lower part of the cartridge 12b is fed by the feed roller 14a and the guide roller 14b.
After passing under the exposure table 10 guided by the drive shaft
It is supplied to the pressure developing device 13 after passing through 22 and the dancer roller 24. Further, the microcapsule paper 11 that has passed through the pressure developing device 13 is fed with a roller 14c, a separating mechanism 14d and a final shaft.
After being guided to 23, it is wound on the winding shaft 15. In addition,
The unexposed microcapsule paper 11 that has left the cartridge 12b is held in an unexposed state by the light-shielding cover 12c. The conveying speed of the microcapsule paper 11 is controlled so as to match a predetermined speed, that is, the moving speed of the original platen glass 2. Therefore, a latent image of a predetermined line of the original 4 is sequentially formed on the microcapsule paper 11 when passing through the exposure table 10.

Below the pressure developing device 13, a paper feeding cassette 17 which constitutes a paper feeding device is detachably attached to the copying machine main body 1, and a suction cup type which sucks paper by using negative pressure suction. A paper feed mechanism 18 is provided. In the paper feed cassette 17,
A color developing paper 16 is stored as a recording paper. The color paper 16 is
Sheets are taken out one by one by the paper feed mechanism 18 and the feed roller 19
a, the pinch roller 19b conveys the color paper roller 19c,
After the front end portion is aligned by 19d and the resist gate 19e, it is carried into the pressure developing device 13.

Through the process described above, the microcapsule paper 11 and the color developing paper 16 are supplied to the pressure developing device 13 in a state in which they are in close contact with each other and integrated. In the pressure developing device 13, the microcapsule surface of the microcapsule paper 11 on which the latent image is formed and the developer application surface of the developer paper 16 are integrated in a state of being in contact with each other and the small diameter roller 13a. The pressure is applied by being sandwiched between the backup rollers 13b. The unexposed microcapsules are destroyed by this pressure, and a visible image is formed on the color developing paper 16.

Microcapsule paper 11 and developer paper from the pressure developing device 13
After being separated from 16 by the separation mechanism 14d, the color developing paper 16 is accelerated by the heat roller 20a of the heat fixing device 20 to form a color image, and then an image is formed, and then the developer roller is carried out to the paper discharge tray 21. . The separated microcapsule paper 11 is wound on the winding shaft 15 via the final shaft 23.

Next, the configurations of the main control device 100, the sub-feed control device 102, and the pressure development control device 104 that control the copying machine 1 will be described with reference to FIGS.

The main control unit 100 includes a CPU 106, a ROM 10 as an operation stopping means.
8. The microcomputer mainly includes a RAM 110 and a bus 112 connecting them. A maintenance cover switch 116 that controls the operation of the device by opening and closing a maintenance cover (not shown) is connected to the input interface 114 connected to the bus 112, and a key for operation is inserted and turned to the left or right to operate the device. A key switch 118 for controlling the input, an input panel 120 provided with information input keys, a copy start switch, etc., an encoder 122 for detecting the rotation angle of the microcapsule paper feed motor 156, the microcapsule paper 11, and the color paper 16 Paper jam sensor 124 for detecting paper jam at the time of feeding, paper break sensors 126 and 128 for detecting that microcapsule paper 11 or developer 16 has run out, microcapsule paper 11 or developer paper, respectively
Paper feed error sensors 130 and 132 for detecting 16 supply errors respectively, a paper separation sensor 134 for detecting whether or not the microcapsule paper and the color developing paper are completely separated, and a light quantity sensor 136 for detecting the light quantity of the halogen lamp 152, Top plate open sensor
138, a rewinding encoder 140 for detecting the rewinding amount of the microcapsule paper, etc. are connected. An output interface 142 is also connected to the bus 112, the auxiliary feed control device 102 is connected to the output interface 142, and a halogen lamp 152 and a cooling fan are provided via drive circuits 144, 146, 148, and 150. 154, a microcapsule paper feed motor 15 for rotating the feed roller 14a and the drive shaft 22
6, heater 158, etc. are connected. In addition, a moving device for moving the platen is connected. A pressure development controller 104 is connected to the sub-feed controller 102. The main controller 100 controls the overall operation of the copying machine 1.

A sub-feed control device 102 shown in detail in FIG. 5 controls the feed of the color developing paper 16 and the feed of the microcapsule paper 11 after the pressure development, and the pressure development control device 104 includes the pressure roller 13a. , 13b is controlled to approach / separate.
Each of these control devices 102 and 104 is mainly composed of a one-chip microcomputer, and CP as a means for releasing the operation stop.
U160, 162, ROM164, 166, RAM168, 170 and buses 172, 174 for connecting them are provided, respectively. Sub-feed control device 102
Although not shown in FIG. 1, an encoder 178 for detecting the rotation angle of the microcapsule paper feed motor 196 and the main control unit 100 are connected to the input interface 176 of FIG. The control device 104 is connected to the microcapsule paper feed motor 196 that rotates the small diameter roller 13a, the backup roller 13b, the feed roller 14c, the final shaft 23, and the like via the drive circuits 182 and 184, the feed roller 19a, and the pinch roller, respectively. 19b,
A motor for supplying the color paper 1 that rotates the color paper rollers 19c and 19d.
98 is connected. Further, the input interface 186 connected to the bus 174 of the pressure development control device 104 is connected to an encoder 188 that detects the rotation angle of the pressure motor 200 that causes the small diameter roller 13a and the backup roller 13b to approach and separate from each other. The pressurizing motor 200 is connected to the output interface 190 via a drive circuit 192.

Next, the control procedure of the control means in one embodiment of the present invention will be described with reference to FIGS.

Copier 1 as an example of an image forming apparatus according to the present invention
In FIG. 1, in the case where an abnormality occurs during the operation of rewinding the unexposed portion of the photosensitive recording medium at the position advanced from the exposed portion after development to the position before the exposed portion, the copying machine 1 4 and the operation stopping means (corresponding to the CPU 106 in FIG. 4) for stopping all the operations of (1) and (2) after the operation stopping by the operation stopping means 106, determining whether or not the abnormality hinders the rewinding of the microcapsule paper 11. And microcapsule paper
When there is no problem in rewinding the microcapsule paper 11, the device for rewinding the microcapsule paper 11 in the copying machine 1 (corresponding to the microcapsule paper feed motor 156 in FIG. 5) is operated to release the operation stop (FIG. 5). (Corresponding to the CPU 160 of the)) and two control means.

Then, those CPUs 106 and 160 are controlled as shown in the general flow chart of FIG. That is, S1: CPU16
0 activates the microcapsule paper feed motor 156.
S2: The CPU 106 detects whether or not an abnormality has occurred in the copying machine 1. S3: If no abnormality is detected in S2, proceed to S3,
The loop is repeated with S2 until the operation of rewinding the unexposed portion before the previous latent image forming portion on the microcapsule paper 11 to the exposure portion is completed. S4: CPU when rewind is complete
160 stops the microcapsule paper feed motor 156 to prepare for the next copy. S5: When the CPU 106 detects in S2 that an abnormality has occurred in the copying machine 1, the process proceeds to S5, and the CPU 106 stops all operations. S6: Next, the CPU 106 displays an error. S7: Microcapsule paper 11 where the abnormality occurred
CPU 160 determines whether or not there is a problem in rewinding. If rewinding is not possible, all the operations are stopped and awaiting repair. If it is determined in S8: S7 that the rewinding is possible, the CPU 160 operates the microcapsule paper feed motor 156 that conveys the microcapsule paper 11 in the reverse direction to restart the rewinding of the microcapsule paper 11. S9: CPU160
Detects whether or not the unexposed portion before the previous latent image recording portion on the microcapsule paper 11 has been rewound to the front of the exposed portion. When rewinding is not completed, it is repeatedly detected. When the CPU 160 detects in S10: S9 that the rewinding of the microcapsule paper 11 is completed, the CPU 160 stops the operation of the microcapsule paper feed motor 156.

Here, an example of how to determine whether or not the abnormal place has a problem in rewinding the microcapsule paper 11 will be specifically described.

The CPU 160 determines whether or not the location where the abnormality has occurred is a hindrance to the rewinding of the microcapsule paper 11 by the procedure shown in the flowchart of FIG. That is, S71: First, whether or not there is a paper jam is detected by a signal from the paper jam sensor 124. For example, if the signal indicates a paper jam, the process proceeds to S72. S72: S
After it is judged that the paper is jammed in 71, it is detected by the signal from the paper separation sensor 134 whether the microcapsule paper 11 and the color-developing paper 16 are completely separated, and if they are separated, S73
Go to and if it shows no separation, it is judged that rewinding is impossible. S73: When the paper is not jammed or when the paper is jammed and the microcapsule paper 11 and the color-developing paper 16 are completely separated from each other, the maintenance cover switch 116 or the signal from the top plate open sensor 138 is used to perform maintenance, for example. If at least one of the cover and top plate is open, it may pose a danger to the user and it is judged that rewinding is not possible. S74: When there is no abnormality in the top plate or the maintenance cover, it is detected based on the key switch signal whether the key switch 118 is in the ON state. The key switch 118 means that even if the main power of the copying machine 1 is ON,
If the key switch 118 is OFF, the copying machine 1 will not operate. When the key switch 118 is in the OFF state, there is no problem in rewinding.
Activate 6. S75: When the key switch 118 is not in the OFF state, the paper break sensor 128 detects whether or not the color-developed paper 16 is empty, and when it is empty, the microcapsule paper feed motor 156 is operated.

As described above, the content of the abnormality is detected based on the various sensors, and it is determined whether or not the rewinding of the microcapsule paper 11 is abnormal.

Whether or not the rewinding in S2 of FIG. 2 is completed means that the rewinding is completed when the sum of the rewinding amount before the occurrence of the abnormality and the rewinding amount after the occurrence of the abnormality reaches a predetermined value. The rewinding amount is counted by the rewinding encoder 140 provided on the shaft 14b in FIG.
Is inputted to the CPU 106, and the pulse is fed from the rewinding encoder 140 in the CPU 106 to count.

From the above, even if an abnormality occurs while rewinding the unexposed portion before the previous latent image forming portion on the microcapsule paper to the front of the exposure portion, the abnormality does not hinder the rewinding operation. In this case, the unexposed portion on the microcapsule paper can be minimized and the lining cost can be reduced by continuing the rewinding operation before the abnormality occurs.

The present invention is not limited to the embodiments described in detail above, and various modifications can be made without departing from the spirit of the invention.

For example, in the present embodiment, after temporarily stopping all the operations of the apparatus after detecting an abnormality, it is detected whether or not the photosensitive pressure-sensitive paper can be rewound. However, as shown in the flowchart of FIG. If an abnormality is detected, it immediately detects whether or not the photosensitive pressure-sensitive paper can be rewound. If rewinding is possible, the rewinding operation is continued without stopping. If not, a microcapsule paper feed motor. May be turned off. That is, S11: The microcapsule paper feed motor 156 is operated. S12: It is detected whether or not an abnormality has occurred in the copying machine 1. S13: If no abnormality is detected in S12, proceed to S13 and repeat the loop with S12 until the operation of rewinding the unexposed portion before the previous latent image forming portion on the microcapsule paper 11 to the exposure portion is completed. . S14: When the rewinding is completed, the microcapsule paper feed motor 156 is stopped to prepare for the next copy. S15: If it is detected in S12 that an abnormality has occurred in the copying machine 1, the process proceeds to S15. S15: Display the error that occurred. S16: It is determined whether or not the location where the abnormality has occurred is a hindrance to the rewinding of the microcapsule paper 11.
S17: If it is determined in S16 that rewinding is not possible, the microcapsule paper feed motor 156 is stopped and a state of waiting for repair is entered. S18: If it is determined in S16 that rewinding is possible,
Detecting whether or not the unexposed portion before the previous latent image recording portion on the microcapsule paper 11 has been rewound to the exposed portion,
When rewinding is not completed, it is repeatedly detected. S1
9: When the completion of rewinding of the microcapsule paper 11 is detected in S18, the microcapsule paper feed motor 156
Stop the operation of.

[Effect of the Invention] As is clear from the above description, according to the image forming apparatus of the present invention, the unexposed portion before the previous latent image forming portion on the photosensitive recording medium is rewound to the exposure portion. If an abnormality occurs on the way, and the abnormality does not hinder the rewind operation, the unexposed portion of the photosensitive recording medium is minimized by continuing the rewind operation before the abnormality occurs. This is an industrially significant effect that the restraining lining cost can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an image forming apparatus according to the present embodiment, FIG. 2 is a flow chart showing a control procedure by a control means of the present invention, and FIG. 3 is a detailed view of a main part of the control procedure of FIG. FIG. 4 is a block diagram around the main control device, FIG. 5 is a block diagram around the sub-feed control device and the pressure developing control device, and FIG. 6 is control by the control means of another embodiment of the present invention. It is a flowchart which shows a procedure. In the figure, 10 is an exposure table, 11 is a microcapsule paper, 13 is a pressure developing device, 16 is a color developing paper, 100 is a main control device, 102 is a sub-feed control device, 104 is a pressure development control device, and 134 is a paper separation device. A sensor, 140 is a rewinding encoder, and 196 is a microcapsule paper feeding motor.

Claims (1)

[Scope of utility model registration request] 1. A latent image is formed on the photosensitive recording medium by exposing the photosensitive recording medium in an exposing section, and having a conveying means for conveying a long photosensitive recording medium in a forward direction and a backward direction. After that, the latent image is formed on the latent image by developing the latent image on the developing medium under pressure by the pressing device at the position where the latent image is transferred in the forward direction. An image forming apparatus for transporting an unexposed portion of the photosensitive recording medium in front of a latent image forming portion in front of the exposed portion in a reverse direction after the pressure development is completed by the conveying device. When an abnormality occurs in the apparatus when the medium is conveyed in the reverse direction, the determination means determines whether or not the abnormality impairs the backward conveyance operation of the photosensitive recording medium, and the determination means Of the photosensitive recording medium If it is determined that the abnormality does not disturb the direction transport operation,
An image forming apparatus, comprising: a conveyance control unit that causes the conveyance unit to continuously perform a backward conveyance operation before an abnormality occurs.