Interlocking Mechanism for Belt Unit Drive Roller Coupling
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Solution Overview
Problem
Conventional image-forming apparatuses experience wear and instability in the coupling mechanism due to frequent uncoupling and recoupling of the movable part with the drive roller during paper jam resolution and toner cartridge replacement, leading to improper drive force transmission.
Innovation Solution
An image-forming apparatus design where the movable part only couples and decouples with the drive roller during belt unit mounting or removal, utilizing an interlocking mechanism to ensure proper movement and prevent unnecessary coupling, thereby reducing wear and maintaining stable drive force transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the movable part of the coupling is configured to move in association with the opening and closing of the cover, then the coupling can be easily operated during paper jam resolution and toner cartridge replacement, but the coupling portions of the movable part and drive roller become worn due to frequent uncoupling and recoupling
Solution Approach 1:
The patent extracts the movable part from the coupling mechanism, making it a separate, independently movable component rather than being integrated with the cover operation. This allows the movable part to remain engaged with the drive roller while the cover opens and closes, preventing wear on the coupling portions while maintaining operational ease through the separately controllable movable part.
2Device complexity
If the movable part of the coupling is configured to move in association with the movement of the cover, then the coupling mechanism is simple to control, but the connection provided by the coupling becomes unstable when the cover is not completely closed
Solution Approach 1:
The patent segments the coupling control into two independent functions: cover opening/closing and movable part movement. The movable part can be independently controlled to maintain stable engagement with the drive roller regardless of cover position, while the cover operation remains simple. This segmentation eliminates the instability issue while preserving control simplicity through separate, dedicated control mechanisms.
Data Source
AI summary
An image-forming apparatus includes a main body, a drive source, an image forming section, a coupling and an interlocking mechanism. The image forming section includes a trigger part and a belt unit including: a belt; and a drive roller and a follow roller opposing each other in a first direction perpendicular to an axial direction of the drive roller. The belt is stretched over the drive roller and the follow roller to extend in the first direction. The coupling includes a movable part movable between a transmitting position transmitting a drive force from the drive source to the drive roller and an interrupting position interrupting transmission of the drive force from the drive source to the drive roller. The interlocking mechanism is configured to interlock movement of the movable part between the transmitting position and the interrupting position with movement of the trigger part.