Pivoting Coupling Member for Drum Mounting Alignment
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Solution Overview
Problem
Existing electrophotographic drum units face challenges in smooth mounting and dismounting due to the need for precise alignment and rotational force transmission, often resulting in mechanical inefficiencies and increased maintenance complexity.
Innovation Solution
The electrophotographic photosensitive drum unit features a coupling member that can pivot in various directions relative to the drum axis, allowing for perpendicular mounting and dismounting, and includes a regulating portion to manage inclination angles, ensuring stable engagement with the driving shaft without the need for complex alignment mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed coupling structure is used for transmitting rotational force to the drum, then reliable rotational force transmission is achieved, but precise alignment mechanisms are required making mounting complex
Solution Approach 1:
The coupling member is designed to be movable relative to the drum axis, capable of pivoting in various directions to accommodate alignment variations during mounting. This dynamic adjustment capability eliminates the need for complex fixed alignment mechanisms while ensuring reliable rotational force transmission through the coupling member's ability to self-align with the driving shaft.
2Reliability
If precise alignment mechanisms are provided for mounting, then reliable engagement is achieved, but mounting and dismounting operations become complex and time-consuming
Solution Approach 1:
The coupling member's ability to pivot and adjust its position allows for simple, tool-free mounting and dismounting operations. The user can easily engage or disengage the process cartridge without complex alignment procedures, as the coupling member automatically adapts to positional variations.
Solution Approach 2:
The coupling member performs self-alignment during mounting, eliminating the need for external alignment mechanisms or complex user operations. The structure automatically adjusts itself to achieve reliable engagement between the driving shaft and the drum.
3Device complexity
If the coupling member is fixed relative to the drum axis, then structural simplicity is maintained, but smooth rotation and rotational accuracy are compromised
Solution Approach 1:
The coupling member is designed with pivotability in various directions relative to the drum axis, enabling it to compensate for manufacturing tolerances and maintain smooth rotation. This dynamic capability improves rotational accuracy without significantly increasing structural complexity.
Data Source
Figure 1~2
Figure 3(a)~3(b)
Figure 4~5
AI summary
A process cartridge (2) usable with an electrophotographic image forming apparatus, the process cartridge includes i) an electrophotographic photosensitive drum rotatable about an axis and having a photosensitive layer at its peripheral surface; ii) process means actable on the drum; iii) a coupling member (150) for receiving an external force for rotating the drum, wherein the coupling member is capable of taking a first angular position (Ll) for transmitting the external force to the drum, a secund angular position inclined away from the axis of the drum of the first angular position (alpha 8) away from the axis of the drum from the first angle position; and iv) a regulating portion (170) for regulating an inclination angle of the coupling member such that downward inclination angle of the coupling member is smaller than an inclination angle of the couling member when the coupling member is at the second angular position.