Cartridge Cover Cutaway for Drum Alignment
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Solution Overview
Problem
Conventional electrophotographic image forming apparatuses lack a mechanism for easily rotating the main body-side engagement portion in alignment with the rotational axis of the photosensitive drum, complicating the mounting and dismounting of process cartridges, which affects the usability and maintenance of the apparatus.
Innovation Solution
A cartridge design featuring a support frame with an arc portion and a protrusion to align with the main body's guide portion, along with a cover member having cutaway portions for positioning and securing the coupling member, allowing for precise engagement and disengagement of the rotational force transmission unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional main body-side engagement portion is used without a rotation mechanism, then the structure is simple, but the mounting and dismounting operation becomes difficult due to misalignment issues
Solution Approach 1:
The main body-side engagement portion is designed to rotate about the rotational axis of the photosensitive drum, transforming a static structure into a dynamic one. This rotation capability allows the engagement portion to align with the cartridge-side engagement portion during mounting, and to rotate to a predetermined angle position during dismounting, thereby solving the alignment difficulty without requiring complex external mechanisms
Solution Approach 2:
The cover member includes a cutaway portion that exposes the coupling member before the cartridge is fully mounted. This preliminary exposure allows the coupling member to engage with the main body-side engagement portion in advance, facilitating the mounting operation by establishing the rotational force transmission connection before final cartridge installation
2Ease of operation
If the coupling member is fully enclosed by the cover member, then the structure is compact and protected, but the engagement and disengagement operations become difficult
Solution Approach 1:
The cover member is segmented with a cutaway portion that selectively exposes the coupling member. This segmentation allows the cover member to simultaneously provide protection for enclosed components and facilitate access to the coupling member for engagement and disengagement operations, resolving the contradiction between compactness and operability
Data Source
AI summary
A cartridge includes a cover member that includes a flat portion, a substantially circular hole portion formed in the flat portion, an arc portion inserted through the hole portion, a first cutaway portion having a shape formed by cutting in the hole portion radially outward, the first cutaway portion arranged in a position opposed to the protrusion portion when viewed in a direction of a rotational axis, and a second cutaway portion having a shape formed by cutting the flat portion toward a photosensitive drum in the direction of the rotational axis to expose a coupling member when viewed in a direction orthogonal to the rotational axis.