JPH07281565A - Image forming device - Google Patents

Abstract

PURPOSE:To prevent the toner cloud formed in a developing part from entering into an electrifying part, to effectively remove the ozone generated in the electrifying part and the ozone on the surface of a photoreceptor, and to prevent the occurrence of the electrification defect and deterioration of the photoreceptor, by providing an ozone decomposing layer to the sheetlike shielding member. CONSTITUTION:In between the electrifying part 7 and the developing part 9, the device main body is provided with the sheetlike shielding member 21 whose tip part is held in contact with the photoreceptor 1, the ozone decomposing layer is disposed on the shielding member 21, and the shielding member 21 is attachably and detachably attached to the photoreceptor case 2 by the attaching member 23. Since the developing roller 8 is rotated in the direction as shown by the arrow in the developing part 9 when the photoreceptor 1 is moved, the toner becomes the toner cloud while curling up and tends to flow toward the electrification charger 6 as shown by the dotted line arrow in company with the other air flow as shown by the solid line arrow in the device, but does not move toward the electrification charger 6 because the flow is prevented by the shielding member 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus such as an electrophotographic copying machine.

[0002]

2. Description of the Related Art Conventionally, in an electrophotographic image forming apparatus of this type, in order to prevent a toner cloud generated in a developing section from reaching a charging section and adhering to a charging wire to cause charging failure, Mylar was attached to the photoconductor case between the charging unit and the developing unit in contact with the photoconductor to prevent the toner cloud from reaching the charging unit, but this hinders the air flow. There is a problem in that ozone generated in the charging section stays in the charging charger and causes charging failure.

[0003]

In order to solve such a problem, there is (1) the one disclosed in Japanese Utility Model Publication No. 58-135754, which has ozone inside the shield plate of the charging charger. The absorbent is applied. However, this has a problem that the ozone on the surface of the photoconductor cannot be effectively removed because the ozone absorber is located inside the shield plate of the charging charger away from the photoconductor.

Therefore, an object of the present invention is to solve the problems of the conventional image forming apparatus as described above, to prevent the toner cloud generated in the developing section from entering the charging section, and also to prevent the charging section. It is possible to effectively remove ozone generated on the surface of the photoconductor and ozone on the surface of the photoconductor, prevent occurrence of charging failure and deterioration of the photoconductor, and extend the life of the charging charger and the photoconductor. An image forming apparatus is provided.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the invention of claim 1 is an electrophotographic image forming apparatus, wherein a charging section 7 and a developing section 9 are provided between the charging section 7 and the developing section 9. A sheet-like shield member 21 whose tip contacts the photoconductor 1 is provided on the main body of the apparatus, and an ozone decomposer layer 22 is provided on the shield member 21. The invention of claim 2 is characterized in that, in the invention of claim 1, the shielding member 21 is detachably attached to the apparatus main body.

[0006]

In the inventions of claims 1 and 2, the latent image is formed on the surface of the photoconductor 1 at the charging portion 7 and the toner image is formed at the developing portion 9 as in the conventional image forming apparatus. Then, the photoconductor 1 carries the toner image and rotates, the transfer unit 11 transfers the toner image formed on the photoconductor 1 to the surface of the transfer paper, and the fixing unit 16 fixes the toner image on the transfer paper. On the other hand, the photosensitive member 1 continues to rotate and is cleaned by the cleaning unit 18. At this time, when the photosensitive member 1 passes the charging unit 7, the tip of the sheet-shaped shielding member 21 comes into contact with the surface thereof. . When the photoconductor 1 moves in this way, toner that has been wound up in the developing unit 9 to form a toner cloud is blocked by the suction force of the exhaust fan 19 even if the toner cloud flows toward the charging unit 7. The shield member 21 does not move toward the charging unit 7 due to being blocked by the member 21.
The ozone decomposer layer 22 provided on the surface decomposes and removes ozone generated in the charging unit 7 and ozone on the surface of the photoreceptor 1,
In this way, if the function of the ozone decomposer layer 22 deteriorates,
Remove the shield member 21 and replace it with a new one.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT In the embodiment of the present invention shown in FIGS.
Reference numeral 1 denotes an endless sheet-shaped photoconductor, which is supported by a drive roller 3 and a plurality of support rollers 4 attached to a photoconductor case 2 mounted on the main body of the apparatus, and rotates in the direction of the arrow. The charging unit 7 having the charging charger 6 on the upper side thereof, the developing unit 9 having the developing roller 8 on the downstream side of the photoconductor 1 of the charging unit 7, and the transfer paper from the back surface of the transfer paper on the downstream side thereof. A transfer unit 11 for transferring the toner image formed on the photoconductor 1 to the surface of the transfer paper by contacting with
A fixing unit 16 having a fixing roller 13 and a pressure roller 14 for fixing the toner image on the transfer paper by heating the toner image on the surface of the transfer paper, and a cleaning unit provided in the photoconductor case 2. A cleaning unit 18 provided with a blade 17 and an exhaust fan 19 for exhausting the air inside the apparatus main body are provided.

Between the charging section 7 and the developing section 9, a sheet-like shield member 21 whose tip contacts the photoconductor 1 is provided on the main body of the apparatus, and an ozone decomposer layer 22 is provided on the shield member 21. The shielding member 21 is detachably attached to the photoconductor case 2 by the attaching member 23. The shielding member 21 may be fixed to the photoconductor case 2, and the ozone decomposing agent layer 22 may be configured by applying an ozone decomposing agent to the shielding member 21 or attaching an ozone decomposing agent sheet.

In the above-mentioned structure, a latent image is formed on the surface of the photosensitive member 1 by the charging charger 6 of the charging unit 7 and a toner image is formed by the developing roller 8 in the developing unit 9 as in the conventional image forming apparatus. Then, the photoconductor 1 carries the toner image and rotates in the direction of the arrow, the transfer unit 11 transfers the toner image formed on the photoconductor 1 to the surface of the transfer paper, and the fixing unit 16 fixes the toner image. The toner image is fixed on the transfer paper by the roller 13 and the pressure roller 14, while the photoconductor 1 continues to rotate and is cleaned by the cleaning blade 17 in the cleaning unit 18, and such a process is repeated again.

At this time, when the photoconductor 1 passes the charging section 7, the tip of the sheet-like shielding member 21 attached to the photoconductor case 2 comes into contact with the surface thereof. When the photoconductor 1 moves as described above, the developing roller 8 rotates in the direction indicated by the arrow in the developing unit 9, so that the toner is rolled up into a toner cloud, and this toner cloud is attracted by the exhaust fan 19. Therefore, even if another air flow in the apparatus is attempted to flow toward the charging charger 6 as indicated by a dotted arrow, the shielding member 21 hinders the flow and moves toward the charging charger 6 as shown in FIG. There is no. Further, the ozone decomposer layer 22 provided on the shielding member 21 decomposes and removes ozone generated in the charging section 7 and ozone on the surface of the photoconductor 1. When the function of the ozone decomposer layer 22 deteriorates in this way, the shielding member 21 is removed and replaced with a new one.

[0011]

The present invention is as described above. According to the invention of claim 1, in the electrophotographic image forming apparatus, the tip of the photosensitive member is provided in the main body of the apparatus between the charging section 7 and the developing section 9. Since the sheet-like shielding member 21 that comes into contact with 1 is provided and the ozone decomposing agent layer 22 is provided on the shielding member 21, it is possible to prevent the toner cloud generated in the developing unit 9 from entering the charging unit 7. Moreover, the ozone generated in the charging section 7 and the ozone on the surface of the photoconductor 1 can be effectively removed,
It is possible to prevent the occurrence of charging failure and the deterioration of the photoconductor 1, and it is possible to extend the life of the photoconductor 1 and the charging unit 7. According to the invention of claim 2, in the invention of claim 1, since the shielding member 21 is detachably attached to the apparatus main body, when the function of the ozone decomposing agent layer 22 is deteriorated, the shielding member 21 is removed to be a new one. There is an effect that other members can be used as they are by simply exchanging them.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of an essential part of an embodiment of the present invention.

FIG. 2 is an enlarged view of a portion surrounded by a chain line 2 of the above.

[Explanation of symbols]

 1 photoconductor 2 photoconductor case 3 drive roller 4 support roller 6 charging charger 7 charging unit 8 developing roller 9 developing unit 11 transfer unit 16 fixing unit 19 exhaust fan 21 shielding member 22 ozone decomposing agent layer 23 mounting member

Claims (2)

[Claims] 1. An electrophotographic image forming apparatus comprising:
Between the charging section 7 and the developing section 9, a sheet-like shield member 21 whose tip contacts the photoconductor 1 is provided in the main body of the apparatus, and an ozone decomposer layer 22 is provided in the shield member 21. Image forming apparatus. 2. The image forming apparatus according to claim 1, wherein the shielding member 21 is detachably attached to the apparatus main body.