Process Cartridge Shutter Linkage for Drum and Drive Protection
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Solution Overview
Problem
Existing process cartridges face issues with scratches or dents on the photosensitive drum and drive members due to their exposure during removal from image forming apparatus, necessitating larger protective structures that increase the cartridge size.
Innovation Solution
A process cartridge design featuring a shutter member that rotates between shielding and open positions, protecting the photosensitive drum and drive members while maintaining a compact size, utilizing a link member to facilitate this movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shutter member is used to protect the photosensitive drum and drive members, then protection against scratches and dents is improved, but the cartridge size increases
Solution Approach 1:
The shutter member is designed to be movable rather than fixed, allowing it to rotate between a shielding position (when protection is needed) and an open position (when access is needed). This dynamic design provides protection only when required, avoiding the need for a permanently large protective structure.
Solution Approach 2:
The shutter member is integrated with the link member, combining the protective function with the existing mechanical structure. The link member's rotation naturally drives the shutter member, merging two functions into one component and avoiding additional size increase.
2Reliability
If the shutter member is made large to cover the photosensitive drum and drive members, then protection coverage is improved, but the device complexity increases
Solution Approach 1:
The link member serves dual functions: it transmits rotational motion from the drive mechanism and simultaneously acts as the shutter member for protection. This multi-functionality reduces the number of separate components needed, simplifying the overall structure while maintaining comprehensive protection.
Solution Approach 2:
The shutter member is automatically actuated by the rotation of the link member itself, without requiring a separate control mechanism. The system uses its own motion to trigger the protective action, eliminating the need for additional actuators or control systems.
Data Source
AI summary
A process cartridge includes: a drum unit including a drive member and a photosensitive drum; a frame body having an opening through which a part of the drum unit is exposed; a shutter member shielding the photosensitive drum exposed through the opening; and a link member connecting the frame body and the shutter member. The shutter member is movable from a shielding position to an open position. A joint between the link member and the shutter member is provided to a part of the shutter member. The link member has a first portion extending from the joint toward the outside of the shutter member. In the shielding position, at least a part of the first portion overlaps with the drive member in a drum axis direction and at least a part of the first portion overlaps with the drive member in a view in an opening direction of the opening.