Drum Unit Coupling Member for Mounting-Safe Drive Transmission
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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 structures where the coupling member's movement is restricted, affecting the reliability and ease of mounting/dismounting.
Innovation Solution
A process cartridge design featuring a movable member with a driving force receiving portion and a connecting member that includes a shaft portion and a restricting/enlarged portion to securely transmit driving force, allowing the movable member to advance and retract relative to the photosensitive drum, ensuring consistent engagement and disengagement with the apparatus main assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the 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 operation is enabled, but the movable member may disengage from the flange due to insufficient restriction
Solution Approach 1:
The coupling member is designed with a movable member that can dynamically change position between an advanced state (for engagement with drive pin) and a retracted state (for disengagement). This dynamic positioning allows the same component to fulfill multiple functions: transmitting driving force when advanced and enabling cartridge removal when retracted, thereby resolving the contradiction between operational ease and engagement reliability
Solution Approach 2:
The flange acts as an intermediary component between the movable member and the drive pin. It provides a stable mounting surface for the movable member while also serving as the transmission path for rotational driving force. This intermediary structure ensures that the movable member remains reliably connected to the flange during operation while still allowing controlled engagement and disengagement
2Adaptability or versatility
If the movable member is allowed to move freely to advance and retract, then the coupling operation is flexible, but the driving force transmission becomes unreliable
Solution Approach 1:
The movable member transitions between two distinct dynamic states: an advanced position where it engages with the drive pin for reliable driving force transmission, and a retracted position where it disengages to allow cartridge removal. This controlled dynamic behavior provides both flexibility in operation and reliability in driving force transmission, as the member is not freely movable but rather positioned deliberately in specific states
Solution Approach 2:
The coupling member utilizes the driving force from the drive pin to automatically maintain its engaged position with the flange during normal operation. The same driving force that rotates the photosensitive drum also keeps the movable member engaged with the flange, providing self-service functionality that ensures reliable driving force transmission without additional restriction mechanisms
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.