JPH0588269A - Jamming detection control method - Google Patents

Abstract

PURPOSE:To surely detect the jamming of a recording material carried on the peripheral surface of a rotating drum and release jamming at the time of forming an image. CONSTITUTION:In the case that a photosensitive material 14 which is carried in a state where it comes in contact with the peripheral surface of a heating drum 42 is jammed, the detection of jamming S2 and the display of jamming S3 are performed and the rotation of the heating drum 42 is stopped. After the opening/closing a door for releasing the jamming S5 is detected, peeling pawls 51 and 52 and the heating drum 42 are driven and the detection S9 of the presence or absence of a remaining paper is performed as to the peripheral surface of the heating drum 42. When the paper exists, the display of jamming S3 is performed again. The jamming is surely released and the waste of the recording material is avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jam detection control method in an image forming apparatus in which a recording material is wound around a peripheral surface of a rotationally driven drum to perform an image forming process. The present invention relates to a jam detection control method for surely detecting a jam generated in association with a drum.

[0002]

2. Description of the Related Art In an image forming apparatus, a photothermographic material and an image receiving material are used as recording materials, and the photothermographic material and the image receiving material are superposed and wound around the peripheral surface of a heating drum which is driven to rotate. There is a device that develops and transfers a photosensitive material and an image receiving material by heating them with a heating drum while conveying them. Here, a schematic structure of the heating drum and an outline of winding and conveying the photosensitive material and the image receiving material will be described. In order to convey the photosensitive material and the image receiving material along the peripheral surface of the heating drum, for example, an endless belt is wound around the peripheral surface of the heating drum, and the heating drum and the endless belt are rotationally driven. Then, the photosensitive material and the image receiving material are sandwiched and conveyed between the endless belt and the heating drum, and the photosensitive drum and the image receiving material are conveyed while being heated by the heating drum to perform development transfer.

Since the structure near the heating drum is complicated, it is difficult to provide a sensor for detecting the presence or absence of the photosensitive material and the image receiving material sandwiched between the heating drum and the endless belt. Therefore, the photosensitive material and the image receiving material cannot be directly detected by the sensor, and the occurrence of the jam is detected by the first sensor provided on the side for supplying the photosensitive material and the image receiving material to the heating drum. This is performed depending on whether or not the photosensitive material and the image receiving material are detected by the second and third sensors provided on the side where the photosensitive material and the image receiving material are discharged within a predetermined time after the detection. Further, the determination as to whether or not the jam is released is made by detecting the opening / closing of the door that is opened when the jam is released and the ON / OFF state of the power supply (interlock or the like). Then, when the door is opened and closed after the jam is displayed, it is presumed that the jam is released, and the jam release display is performed.

[0004]

However, even if the door is opened / closed after the jam is displayed, the jam is not always canceled, and the jam may be forgotten even if the door is opened / closed. Even in such a case, conventionally, it is determined that the jam is cleared, and the next image forming process is enabled. Then,
Since the jam is not actually cleared, even if the image forming operation is started, the jam immediately occurs again and the recording material is wasted. SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems, and to provide a jam detection control method for surely detecting a jam of a recording material wound around the peripheral surface of a rotary drum and canceling the jam.

[0005]

The above object of the present invention is to provide a jam detection control method in an image forming apparatus in which an image recording material is wound around a peripheral surface of a rotary drum to perform an image forming process. If a jam occurs on the surface, the jam is detected and the jam is displayed, the rotating drum is stopped, the opening and closing of the door operated when the jam is released is detected, the jam is displayed, and then the rotating drum is rotated. In addition, the peeling claw provided for peeling the image recording material from the peripheral surface of the rotating drum is driven to perform the peeling operation of the image recording material, the presence or absence of the residual image recording material is detected, and in the case of residual This is achieved by a jam detection control method characterized by performing jam display again.

[0006]

Operation: That is, when a jam occurs in relation to the rotating drum, the jam is displayed, the rotation of the drum is stopped, the door is opened / closed to clear the jam, and the jam display is cleared. The peeling claw and drum provided on the surface are re-driven to detect the residual recording material, and if there is residual jam, the jam display will be displayed again. It is possible to eliminate the waste of the release and the recording material.

The rotary drum in the present invention includes a drum having a heating function, a drum having an exposure function, a drum having a simple conveying function, and the like. The recording material in the present invention includes a light-sensitive material and an image receiving material. Examples of the photosensitive material used in the present invention include a photothermographic material. Regarding the photothermographic material, U.S. Pat.
500,626, 4,483,914, 4,430,415, 4,503,137, JP-A-59-154445 and 59-180548,
59-165054, 61-88256, 6
0-120356, 59-218443, 61
No. 238056 and the like.

The above photothermographic material basically has a photosensitive silver halide, a binder, a dye donating compound and a reducing agent (the dye donating substance may also serve as the reducing agent) on the support. In addition, an organic silver salt and other additives can be added if necessary.

The above-mentioned photothermographic material may give a negative image or a positive image upon exposure. As a method of giving a positive image, a method of directly using a positive emulsion (a method using a nucleating agent and a light fog method) as a silver halide emulsion, a dye which emits a positive diffusible dye image Any of the methods using a donor compound can be adopted.

The image forming solvent used for diffusion transfer is, for example, water, and this water is not limited to so-called pure water, but includes water in a widely and commonly used meaning. Also,
A mixed solvent of pure water and a low boiling point solvent such as methanol, DMF, acetone or diisobutyl ketone may be used. further,
It may be a solution containing an image forming accelerator, an antifoggant, a development terminator, a hydrophilic thermal solvent and the like.

[0011]

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Needless to say, the present invention is not limited to this embodiment. Figure 1
Is a schematic configuration diagram of an image forming apparatus that is an embodiment of the present invention,
FIG. 2 is a flow chart for explaining the processing when a jam occurs.

The feature of the present embodiment lies in the processing of the jam generated in the heat development transfer section 29 which will be described later. For convenience of explanation, first, the overall structure of the image forming apparatus will be explained, and then the main part will be explained. .. A photosensitive material magazine 12 is arranged in the image forming apparatus 1, and a photosensitive material 14 is wound and stored in the photosensitive material magazine 12 in a roll shape. The photosensitive material 14 has a photosensitive silver halide, a binder, a dye-providing substance, and a reducing agent on a support, and the dye-providing substance is transferred to the image-receiving material by superimposing it on the image-receiving material and performing heat development. Transcribed.

With respect to the light-sensitive material 14, the heat development transfer process is accelerated in the presence of an image forming solvent such as water. Sensitive Material Magazine 1
2. Photosensitive material 14 pulled out from 2 and cut into a predetermined length
Are conveyed to the exposure unit 16. A receiving material magazine 18 is disposed below the photosensitive material magazine 12, and an image receiving material 20 is wound in a roll shape and stored in the receiving material magazine 18. A dye fixing material having a mordant is applied to the image forming surface of the image receiving material 20.
The image receiving material 20 that is pulled out from the material receiving magazine 18 and cut into a predetermined length is conveyed to a heat development transfer section 22 described later.

A platen glass 25 is provided on the upper part of the main body, and when a reflective original is used, the original cover 2 that covers the upper surface of the original is attached. A light source 28, a first moving mirror 22A that moves together with the light source 28, and a plurality of second moving mirrors 22B whose relative movement is variable with respect to the first moving mirror 22A are arranged immediately above the exposure unit 20 as a reflection original illuminating device. All of them are movable along the platen glass 25. Further, through the imaging lens unit 19,
A photometric device 2 for measuring the image density of a document based on the image light reflected by the fixed mirror 23 and the movable mirror 24.
1 is arranged, and the exposure condition is determined by the photometric device 21. The exposure of the photosensitive material 14 is performed by the light source 28 and the first
The second moving mirror 22 while moving the moving mirror 22A.
B is moved at a predetermined speed to illuminate the light from the light source 28 along the original, and the reflected light is reflected by the mirrors 22A and 22A.
B, 23 and the imaging lens unit 19 are used to expose the exposure unit 16
An image is formed on the light-sensitive material 14 located at, and scanning exposure is performed.

A transparent original illuminating device (proof unit) 30 is detachably mounted on the upper part of the main body. The transparent original illuminating device 30 can be moved between an illumination position on the platen glass 25 and a standby position separated from the platen glass 25.

A transmissive light source 36 for illuminating the original on the platen glass 25 from the back side (upper side in the drawing) is provided in the transmissive original illuminating device 30, and the transmissive light source 36 is provided at the illumination position.
Moves in the transparent original illuminating device 30 in the direction of arrow a to scan the original with a slit to expose the photosensitive material 14.

The photosensitive material 14 which has been scanned and exposed by the exposure section 16
Is conveyed in an inverted manner, and water as an image forming solvent is applied by the water applying section 38. The photosensitive material 14 coated with water by the water coating section 38 is superposed on the image receiving material 20 in the thermal development transfer section 29 to be subjected to thermal development transfer. The heat development transfer section 29 is composed of a heating drum 42 containing a heating element 40 such as a halogen lamp and an endless pressure contact belt 44. The photosensitive material 14 and the image receiving material 20 are superposed and pressed against the outer periphery of the heating drum 42 by the endless pressure contact belt 44, and are sandwiched and conveyed over the peripheral surface of the heating drum 42 in the superposed state to be thermally developed. Is becoming As a result, the photosensitive material 14 releases the movable dye, and at the same time, the dye is transferred to the dye fixing layer of the image receiving material 20 to obtain an image.

The photosensitive material 14 separated from the image receiving material 20 after the heat transfer is sent to a waste photosensitive material tray 46 provided below the heat development transfer section 29. Further, the image receiving material 20 separated from the photosensitive material 14 is
It is adapted to be accumulated in the discharge tray 48. The peeling between the photosensitive material 14 and the image receiving material 20 is performed by the peeling claw 5.
1 and the peeling between the heating drum 42 and the image receiving material 20 is performed by the peeling claw 52. A first sensor A for detecting a jam is provided on the side of supplying the photosensitive material 14 and the image receiving material 20 near the heating drum 42, and a second sensor B and a third sensor A on the side of discharging the jam. A sensor C is provided.

Next, with reference to the flow chart shown in FIG. 2, the processing operation when a jam occurs in the heat development transfer portion 29 will be described. When a jam occurs in the heat development transfer unit (hereinafter, simply referred to as a development unit) 29 as shown in step S1, in step S2, the first sensor A
Within a predetermined time after the photosensitive material 14 is detected by
When the image receiving material 20 is not detected by the sensor B, the occurrence of jam is detected, and the jam is displayed as shown in step S3. When a jam occurs, the rotation of the heating drum 42 is stopped in step S4, and the door is opened and closed for the jam release process as shown in step S5. When the opening / closing of the door is detected, it is considered that the jam is released, and the jam display is turned off as shown in step S6. Conventionally, the image formation is performed in this state, but in the present embodiment, the following operation is performed.

That is, as shown in step S7, the heating drum 42 is re-driven and rotated, and at the same time, the peeling claws 51 and 52 are driven as shown in step S8. As a result, if the photosensitive material 14 and the image receiving material 20 are stuck to the peripheral surface of the heating drum 42 as residual paper, they are peeled off by the peeling claws 51 and 52, and the second sensor B as shown in step S9.
Alternatively, it is detected by the third sensor C. Then, if there is residual paper, the process returns to step S2 to detect jam again, and the residual paper jam is displayed again in step S3. If there is no remaining paper, the image forming process can be restarted as shown in step S10.

If the door is not opened / closed in step S5, the process does not proceed to step S6, and the jam display is continued and the jam is released.
As described above, in the jam detection control method according to the present embodiment, when a jam occurs during image formation, the peeling operation is performed after opening and closing the door for clearing the jam, and then on the peripheral surface of the heating drum. Since it detects whether there is residual paper,
The jam detection and the jam cancellation are surely performed.

[0022]

As described above, the jam detection control method according to the present invention performs the jam detection and the jam display when the recording material wound around the peripheral surface of the rotary drum becomes a jam. Stop the rotation of the rotating drum, detect the opening and closing of the door to clear the jam, then once clear the jam indication, then re-drive the rotating drum and the peeling claws to check whether there is residual recording material on the peripheral surface of the drum. When it is detected, the jam is displayed again to prompt the user to clear the jam. Therefore, the jam will be released reliably,
It is possible to eliminate the inconvenience that the jam is presumed to have been cleared and the process proceeds to image formation and the recording material is wasted, and the reliability and usability of the image forming apparatus can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an image forming apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a jam process.

[Explanation of symbols]

 1 Image Forming Apparatus 2 Original Cover 12 Photosensitive Material Magazine 14 Photosensitive Material 16 Exposure Section 18 Receiving Material Magazine 20 Image Receiving Material 29 Thermal Development Transfer Section 25 Platen Glass 30 Transparent Original Illumination Device 38 Water Application Section 42 Heating Drum 51, 52 Peeling Claw A , B sensor

Claims (1)

[Claims] 1. A jam detection control method in an image forming apparatus for performing an image forming process by winding an image recording material around a peripheral surface of a rotary drum, wherein a jam is detected when a jam occurs on the peripheral surface of the rotary drum. After the jam is displayed and the rotating drum is stopped, the jam display is released by detecting the opening / closing of the door operated when the jam is released, and then the rotating drum is rotated and the image recording is performed from the peripheral surface of the rotating drum. The peeling claw provided for peeling the material is driven to perform the peeling operation of the image recording material, and the presence or absence of the residual image recording material is detected,
A jam detection control method characterized in that a jam is displayed again when there is a residual.