Drum Unit Movable Coupling for Reliable Cartridge Drive Engagement
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Solution Overview
Problem
Existing electrophotographic image forming apparatuses face challenges in efficiently transmitting rotational driving force to photosensitive drums within process cartridges, particularly in ensuring reliable engagement and disengagement mechanisms for smooth operation and easy mounting/dismounting.
Innovation Solution
The design incorporates a coupling member with a movable member and a connecting member, featuring a shaft portion and an enlarged portion with a restricting mechanism to securely transmit and receive driving force, allowing the movable member to advance and retract relative to the photosensitive drum for effective force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a coupling member is advanced and retracted in the rotation axis direction to engage with and disengage from the drive pin, then the mounting and dismounting of the cartridge becomes easier, but the reliability of driving force transmission may be compromised due to potential disengagement
Solution Approach 1:
The coupling member is designed to be movable in the axial direction of the photosensitive drum, allowing it to dynamically change position between engaged and disengaged states. This dynamic capability enables easy mounting and dismounting while maintaining reliable driving force transmission when engaged, as the movable structure allows for proper alignment and secure connection during operation.
2Adaptability or versatility
If the coupling member is made movable relative to the photosensitive drum, then the engagement mechanism becomes more flexible, but the structural complexity increases
Solution Approach 1:
The coupling member is segmented into distinct functional portions: a movable member that can move axially and a connecting member that transmits driving force. This segmentation allows the movable portion to provide flexibility for engagement while the connecting portion maintains structural simplicity for reliable force transmission, thereby reducing overall structural complexity.
Solution Approach 2:
The coupling member is designed to perform multiple functions: it serves as both a movable engagement component and a driving force transmission element. The connecting member with its shaft portion and enlarged portion structure allows it to both guide the movable member and transmit rotational force, reducing the need for separate components and simplifying the overall structure.
Data Source
AI summary
To provide a process cartridge, a drum unit capable of receiving a driving force from the main assembly, and an image forming apparatus including the process cartridge. A cartridge is provided with a movable member having a driving force receiving portion. The movable member moves between an advanced position and a retracted position.