JPS6275659A - Process cartridge - Google Patents

Abstract

PURPOSE:To prevent the scattering of a developer by rotating a developing sleeve in such direction that it is pressed to a photosensitive body when a process kit is grasped with a process cartridge enclosure and the vessel of a developing device. CONSTITUTION:When the process cartridge is grasped with the enclosure 11 and the vessel 12a of he developing device 12 the developing device 12 is rotated in the direction of an arrow B with a fulcrum 15 as a center and a developing sleeve 13 is pressed to the photosensitive body 14. Since the fulcrum 15 where the developing device of the process cartridge attachable to and detachable from an image forming device is supported is placed under the developing sleeve 13 in this manner, a gap 16 between the developing sleeve 13 and the photosensitive body 14 is prevented from expanding when the process cartridge is grasped, and the falling of the developer and the penetration of foreign matters to the gap due to the expansion of the gap and the disturbance of images due to the impression, which is generated by the shock for the return of the gap to the original state, are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a process cartridge, and more particularly, to a process cartridge that is detachably mountable to, for example, an image forming apparatus.

[Conventional technology]

FIG. 4 is a sectional view of a conventional process cartridge.

1 is a process cartridge frame, 2 is a developing device, 3 is a developing sleeve, 4 is a photoreceptor, 5 is a fulcrum that supports the developing device 2,
6 is a gap between the developing sleeve 3 and the photoreceptor 4. Conventionally, in a grasping type device as shown in FIG. 4, the fulcrum 5 supporting the developing unit 2 was located on one side of the developing sleeve 3, so the appearance of the cartridge was changed to the shape shown in FIG. , when the process kit is held between the housing and the container of the developing device, the developing device 2 is rotated around the fulcrum 5 on the one hand (
A direction), and the gap 6 between the photoreceptor 4 and the developing sleeve 3 widens. As a result, the developer is dropped and
This resulted in dirt on the image and dirt inside the machine, and foreign matter entered the gap 6, causing image disturbance. Furthermore, the cap has the disadvantage of causing image disturbance due to dents and scratches caused by the impact when the developing device 2 returns to its original position.

[Purpose of IJI]

The present invention has been made in view of the drawbacks of the prior art as described above, and an object of the present invention is to provide a new process cartridge.

[“Death” to solve problems]

[1-Note] A process cartridge according to the present invention for achieving objective 1 has a gripping portion that grips and holds a cartridge housing and a developer container on the opposite side of the housing, and this developer has When setting the distance to the photoreceptor, the photoreceptor is rotated about one axis and pressed against the photoreceptor, and the center of rotation when pressing is set at a position far from the casing.

This is to prevent the developing device from rotating as much as possible when it is held.

〔Example〕

The present invention will be explained below based on the illustrated embodiments.

FIG. 1 is a sectional view of a process cartridge according to the present invention, in which 11 is a process cartridge housing, 12 is a developing device, 12a is a container thereof, 13 is a developing sleeve, 14 is a photoreceptor, and 15 is a support for the developing device. The fulcrum 16 is the gap between the developing sleeve and the photoreceptor. Further, in order to ensure a gap 16 between the photoreceptor 14 and the developing sleeve 13, this device has a configuration in which cylindrical spacers 18 are inserted at both ends, and the developing sleeve 13 is pressed against the photoreceptor 14 by applying pressure with a spring. .

When the process cartridge is gripped by the housing 11 and the container 12a of the developing device 12 as shown in FIG.
rotates around the fulcrum 5 in one direction (arrow B),
The developing sleeve 13 is pressed against the photoreceptor 13.

As explained above, by locating the fulcrum that supports the developing unit of the removable process cartridge in the image forming apparatus at the lower part of the developing sleeve, it becomes easier to grip the process cartridge, especially when downsizing the apparatus. When applying L to the developing device or cleaning akg to avoid a certain grip, it prevents the gap between the developing sleeve and the photoconductor from widening, and prevents developer from falling into the gap due to the widening of the gap. This has the effect of preventing image disturbances caused by dents and scratches caused by entry of foreign matter, impact when the gap returns to its original state, and the like.

〔Effect of the invention〕

Since the process cartridge according to the present invention has the above-described configuration, even if the cartridge is held, the rotation of the developing device is
# Since there is no impact, there is no scattering of developer.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a process cartridge according to the present invention;
FIG. 2 is a perspective view, and FIG. 3 is a perspective view showing how the cartridge is held. FIG. 4 is a sectional view of a conventional process cartridge, and FIG. 5 is a perspective view showing how the cartridge is held using the fulcrum shown in FIG. 4. In the figure, 11 is a process cartridge, 12 is a developing device, 13 is a developing sleeve, 14 is a photoreceptor, 15 is a fulcrum that supports the developing device, and 16 is a gap between the developing sleeve and the photoreceptor.

Claims (1)

[Claims] (1) A process cartridge that is removably attachable to an image forming apparatus is characterized by having a structure in which the developing sleeve is rotated in a direction to press the photoreceptor when the process kit is gripped between the process cartridge housing and the developer container. process cartridge.