Process Cartridge Photosensitive Drum Coupling for Axial-Free Mounting
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Solution Overview
Problem
Conventional process cartridges require mechanisms for moving a rotatable member in the axial direction for transmitting rotational force, which complicates mounting and demounting, and can lead to non-uniform rotation of the photosensitive drum.
Innovation Solution
A process cartridge design that allows for mounting and demounting in a direction perpendicular to the drive shaft axis without requiring axial movement, using a coupling mechanism that transmits rotational force smoothly to the photosensitive drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotatable member with a non circular twisted hole and projection engagement mechanism is used to transmit rotational force, then the photosensitive drum can be rotated, but the mounting and demounting process becomes complicated and requires axial movement mechanism
Solution Approach 1:
The invention separates the rotational force transmission function from the mounting/demounting operation. The drive shaft and coupling are designed as independent components that remain engaged during cartridge replacement, eliminating the need for axial movement mechanisms while maintaining reliable torque transmission.
Solution Approach 2:
The coupling mechanism is pre-configured to maintain engagement between the drive shaft and coupling throughout the mounting and demounting process. This preliminary arrangement ensures that rotational force transmission is continuously available without requiring additional movement mechanisms.
2Ease of operation
If the rotatable member is moved in axial direction during mounting and demounting, then engagement between projection and hole is achieved, but rotation non-uniformity occurs
Solution Approach 1:
The invention introduces a dynamic coupling mechanism that automatically adjusts its engagement state during cartridge installation. The coupling engages with the drive shaft at an appropriate position during mounting, ensuring smooth rotation without axial movement, while maintaining operational flexibility.
Solution Approach 2:
The coupling acts as an intermediary element between the drive shaft and the cartridge motor. It mediates the transmission of rotational force while preventing direct axial movement, thereby maintaining rotation uniformity during cartridge replacement operations.
3Device complexity
If a gear engagement mechanism is used to rotate the photosensitive drum, then mounting and demounting can be performed without axial movement, but rotation non-uniformity is difficult to prevent
Solution Approach 1:
The invention replaces the traditional gear engagement mechanism with a direct coupling-to-drive-shaft connection. This substitution eliminates gear-related rotation non-uniformity while maintaining the simplified mounting and demounting operation without axial movement requirements.
Data Source
AI summary
A cartridge includes a photosensitive drum having a rotational axis about which the photosensitive drum is rotatable. The cartridge also includes a developing roller having a rotational axis about which the developing roller is rotatable. A developing frame rotatably supports the developing roller. A drum flange is connected to an end of the photosensitive drum, with the drum flange including an inner surface facing the rotational axis of the photosensitive drum and a hollow portion inside of the drum flange. A casing including a bearing member rotatably supports the photosensitive drum.