Photosensitive Drum Coupling Mechanism for Accurate Drive Transmission
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Solution Overview
Problem
Existing photosensitive drum units face challenges in easily mounting and dismounting coupling members, which complicates maintenance and assembly processes, leading to potential inaccuracies in rotational force transmission and increased operational complexity.
Innovation Solution
A photosensitive drum unit design featuring a coupling member with a rotational force receiving portion and a spherical portion, along with a drum flange that includes a hole and groove structure, and a closing member to facilitate easy mounting and dismounting, utilizing a specific assembly and disassembly method to ensure accurate and efficient coupling member placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coupling member is provided at the end portion of the drum to receive rotational force, then the drum can be rotated with accurate drive transmission, but the mounting and dismounting of the coupling member becomes difficult and complex
Solution Approach 1:
The coupling member is divided into a drum flange portion and a coupling portion that can be assembled and disassembled separately. The drum flange includes a hole portion and groove portions, while the coupling member includes a spherical portion and projected portions, allowing independent mounting and dismounting operations without affecting the drum's rotational function.
Solution Approach 2:
The spherical portion of the coupling member is inserted into the hole portion of the drum flange, with projected portions fitting into groove portions. This nested structure allows the coupling member to be securely mounted while maintaining easy accessibility for assembly and disassembly through the opening of the hole portion.
2Measurement precision
If the coupling member is made movable relative to the drum to accommodate positional deviation, then drive transmission accuracy is improved, but the structural complexity increases
Solution Approach 1:
The coupling member incorporates a spherical portion that can move within the hole portion of the drum flange. This spherical geometry naturally accommodates positional deviations through radial movement while maintaining rotational alignment, eliminating the need for complex adjustment mechanisms.
Solution Approach 2:
The coupling member allows positional parameters to change within the hole portion while maintaining functional alignment. The spherical portion can shift position to compensate for manufacturing tolerances or assembly variations, ensuring accurate drive transmission without requiring complex positioning systems.
Data Source
AI summary
A gear unit for transmitting a rotational force to a rotatable member carrying developer and to which a coupling member is mountable. The gear unit includes a hole portion which opens outwardly in a direction along a rotational axis of the cylinder gear and which has an opening capable of accommodating the spherical portion, a groove portion which continues from the hole portion and which is capable of accommodating the projected portion, and a limiting portion for limiting inward movement of the spherical portion in the direction along the rotational axis of the gear. A closing member is provided for partially covering the opening of the hole portion and mounted to the gear to limit outward movement of the spherical portion in the direction along the rotational axis of the gear. The closing member is constituted by a plurality of independent pieces.