Photosensitive Drum Coupling with Guided Braking for Stable Rotation
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Solution Overview
Problem
Conventional electrophotographic image forming apparatuses face challenges in maintaining stable torque and rotation of photosensitive drums due to varying torque requirements and lack of effective braking mechanisms, affecting maintainability and performance.
Innovation Solution
The introduction of a cartridge and drum unit design featuring a coupling system with driving and braking force application members, including a guide for relative movement, ensures stable rotation and torque management through engagement with a driving force application member and a braking force application member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a coupling structure is used to transmit driving force from the main assembly to the cartridge, then the cartridge can be driven to rotate, but the torque required to drive the cartridge varies and cannot be stabilized
Solution Approach 1:
A braking force application member is introduced as an intermediary component between the coupling and the photosensitive drum. This member engages with the coupling to provide a braking force that counteracts variations in driving torque, thereby stabilizing the rotation of the photosensitive drum while allowing the coupling to still transmit driving force from the main assembly.
2Ease of repair
If the cartridge is designed to be detachable from the main assembly, then user maintenance becomes easier, but the structure becomes more complex with additional coupling mechanisms
Solution Approach 1:
The braking force application member is integrated into the coupling structure, merging the braking function with the existing drive transmission mechanism. This integration allows the cartridge to maintain its detachable design for easy user maintenance while the combined coupling-braking structure provides stable torque control without requiring separate complex braking mechanisms.
3Device complexity
If no braking mechanism is used, then the structure remains simple, but the rotation of the photosensitive drum becomes unstable due to varying torque
Solution Approach 1:
The braking force application member serves as an intermediary element that is engaged with the coupling to provide a controlled braking force. This intermediary braking mechanism stabilizes the rotation of the photosensitive drum by compensating for torque variations while adding minimal structural complexity to the overall system.
Data Source
AI summary
[Problem to be solved] To further develop conventional technique.[Solution] a cartridge includes a casing, a photosensitive drum and a coupling. the coupling includes a driving force receiving portion for receiving a driving force by engagement with a driving force application member, a braking force receiving portion for receiving in braking force by engagement with a braking force application member, and a guide for moving the braking force application member relative to the driving force application member.