JPS634253A - Process cartridge and image forming device using process cartridge - Google Patents

Abstract

PURPOSE:To miniaturize a device and to eliminate a defect in contacting which is caused by lubricating oil scattered from a driving part by arranging electric contacts in front of a driving part constituted on the inner side of a main body. CONSTITUTION:The respective contacts are all arranged in front of a process cartridge 1 and positioned on the opposite side from a driving input gear 13 fitted on the inner side of a photosensitive drum 6. Consequently, the lubricating oil which is applied to the gear train on the main body side which is coupled with the driving input gear 13 is prevented from being scattered to the contact part to cause a defect in contacting. Further, a high-voltage contact 2 and a bias contact 4 are positioned almost on a straight line crossing the axis of the photosensitive drum 6 and an earth contact 3 is constituted off the straight line, so they can be arranged in a small space. Further, the earth contact 3 can be positioned at large distance from the high-voltage contact 3, so a leak is precluded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of the cartridge, and particularly to the structure of the electrical contacts connected to the main device side.

(Prior Art) In a process cartridge used in a conventional image forming apparatus, an electrical contact for connection with the main body device is disposed on the back side. Although this is preferable in terms of safety for users, it has drawbacks such as space constraints. −
In general, the drive section is configured on the back side of the main device, so various components are crowded on the back side compared to the front side, so placing the contact section further back will lead to an increase in the size of the device. There were many things. Additionally, when arranging the contact section near the drive section, lubricating oil applied to gears, etc. may adhere to the contact point and cause contact failure, so components and structures to prevent this are required and complicated. There were some drawbacks.

(Problems to be Solved by the Invention) As image forming apparatuses become smaller and lighter, it is necessary to effectively utilize the limited space inside the main body and to obtain reliable functions with a simple configuration. It's coming.

Electrical contacts are disposed on the front side of the drive unit configured on the body odor side, and the function is satisfied with a simple contact configuration.

(Example) A copying machine will be described as an example of an image forming apparatus.

1 and 2 are a front view and a cross-sectional view of a process cartridge 1 used in a copying machine, in which 2 is a high voltage contact of a primary charger, 3 is a ground contact of a primary charger, and 4 is a developing device. A bias contact 5 is a support shaft on the front side of the photosensitive drum. These are covered with a cartridge cover (not shown) for reasons of security, safety, and operability. The process cartridge 1 includes a photosensitive drum 6, a charger 7, a developer 8,
It is composed of a cleaning device 9, and an electric appliance 1.
0, the shield plate 11 is connected to the high voltage contact 2 and the ground contact 3, respectively, and the developing sleeve 12 is connected to the bias contact 4.
It is connected to the.

As shown in the third figure, these contacts are all arranged on the front side of the process cartridge 1, and are located on the opposite side of the drive input gear 13 attached to the back side of the photosensitive drum 6. This can prevent the problem of lubricant applied to the gear train on the main body (not shown) connected to the drive input gear 13 splashing onto the contact portions and causing contact failure.

Furthermore, the high voltage contact 2 and the bias contact 3 are located almost on a straight line perpendicular to the axis of the photosensitive drum 6, and the ground contact 3 is located off the straight line, so it takes up less space. Furthermore, since the distance between the ground contact 3 and the high voltage contact 2 can be increased compared to the case where the ground contact 3 is arranged on a straight line as described above, there is an effect of preventing leakage.

FIG. 4 shows an embodiment in which a process cartridge 1 is mounted on a copying machine main body 14, and the process cartridge 1 is supported by a cartridge support frame 15 that is rotatable in the direction of arrow A. When the cartridge support frame 15 is closed, the high voltage contact 2 and the bias contact 4 are connected to the high voltage contact 16 on the main body side.
, are in pressure contact with the bias contact 17, and a predetermined voltage is applied from the main body side. At the same time, the ground contact 3 is also connected to the main body ground contact 18. In this way, by arranging the contacts on the front side of the main body in correspondence with the contacts of the process cartridge, the dead space can be effectively utilized and the size of the copying machine main body can be reduced.

In the embodiment, the high voltage contact 2 and the bias contact/point 4 shown in the first diagram are
The positional relationship is a=165°±10°.

The configuration is such that b=186mm±15mm.

(Effects of the Invention) As explained above, by configuring the electrical contacts and drive input gear of the process cartridge on the opposite side, and correspondingly arranging the contact section and drive section on the main body side, the device can be made smaller. It has become possible to prevent contact failures caused by lubricating oil splashing from the drive part.

[Brief explanation of the drawing]

1 to 3 are a front view, a sectional view, and a bottom view of the process cartridge of this embodiment, and FIG. 4 is a schematic diagram showing the relationship between the process cartridge and the main body of the apparatus. 1-m-Process cartridge 2-11-High voltage contact of secondary charger 3-11 Earth contact of primary charger 4-m-Bias contact of developer 6--Photosensitive drum 13-m-Drive input gear Reason 1 Purification *<No change in content) Procedure Neho Seishi Seven i (Method) % Formula % 2. Name of the invention Process cartridge and image forming apparatus using this cartridge: Relationship with the person making the amendment Patent applicant Address: 3-30-2 Shimomaruko, Ota-ku, Tokyo Address: 146
Canon Co., Ltd., 3-30-2 Shimomaruko, Ota-ku, Tokyo (
Telephone number: 758-2111) 5. Date of amendment order (all sending dates): August 26, 1985 6. Description and drawings subject to amendment 7. Contents of amendment (1) Engraving of the specification originally attached to the application・Correct as shown in the attached sheet (no changes to the content). (2) Amend the drawings as originally attached to the application in accordance with the engravings and attachments (no changes to the contents).

Claims (3)

[Claims] (1) In a process cartridge that integrally supports a photosensitive drum, a corona discharger, a developing device, and a process means of a cleaning device, and is removable from the main body of an image forming apparatus, the photosensitive drum and the process means are integrally supported. a support body, a photosensitive drum having a drive input gear at one end; and a photosensitive drum provided on the opposite side of the support body from the drive input gear, and located below the rotation center of the photosensitive drum, and further from the side of the photosensitive drum. A process cartridge characterized in that it has a high voltage contact for a corona discharger and a contact leading to a shield plate on the left side of the center of rotation when viewed, and has a bias contact for a developing device on the right side. (2) The high voltage contact and the bias contact are located at an angle of 165°±10° with the rotation center of the photosensitive drum as the origin,
and are arranged at a distance of 186 mm±15 mm, and furthermore, both contacts are located almost on a straight line perpendicular to the axis of the photosensitive drum, while an electric contact following the shield plate connects the high voltage contact and the bias contact. The process cartridge according to claim 1, wherein the process cartridge is disposed at a position off a straight line. (3) In an image forming apparatus that removably supports a process cartridge that integrally supports a photosensitive drum, a corona discharger, a developing device, and a process means of a cleaning device, the process according to claim (1) A cartridge, a cartridge support frame that removably supports the process cartridge and rotates around a single axis, and contacts provided on the main body that are located corresponding to each contact of the process cartridge when the cartridge support frame is closed. The contacts on the process cartridge side and the main unit side are
An image forming apparatus using a process cartridge, characterized in that the process cartridge is moved toward and away from the cartridge by opening and closing the cartridge support frame.