Locking Member for Photosensitive Drum Positioning in Image Forming Apparatus
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Solution Overview
Problem
In conventional image forming apparatuses, the positioning accuracy of the photosensitive drum relative to the housing is compromised due to displacement of the drum unit or cartridge during the attachment or detachment of toner or developing cartridges.
Innovation Solution
The image forming apparatus includes a housing, a drum cartridge with a photosensitive drum, a second cartridge (either toner or developing) that is attachable to and detachable from the drum unit, and a drawer with a locking member that secures the photosensitive drum to the drawer, preventing displacement during cartridge exchanges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the drum cartridge is made detachable from the drawer to enable toner cartridge exchange, then the ease of operation is improved, but the positioning accuracy of the photosensitive drum deteriorates due to displacement during attachment/detachment
Solution Approach 1:
The locking member is activated before the toner cartridge exchange operation to pre-establish the locked state of the drum cartridge. By performing the locking action in advance (when the drawer is in the inside position), the system ensures that any subsequent movements during toner cartridge exchange cannot cause displacement, thus resolving the contradiction between ease of operation and positioning accuracy.
2Ease of operation
If the drawer is made movable between inside and outside positions to facilitate cartridge exchange, then the ease of operation is improved, but the stability of the drum cartridge deteriorates due to potential displacement
Solution Approach 1:
The locking member transitions between locked and unlocked states dynamically based on the drawer position. When the drawer is in the inside position, the locking member locks the drum cartridge to maintain stability. When the drawer is moved to the outside position for cartridge exchange, the locking member is unlocked to allow easy operation. This dynamic switching resolves the contradiction between stability and ease of operation.
Data Source
AI summary
An image forming apparatus includes: a housing; a drum cartridge as a first cartridge including a photosensitive drum; a second cartridge accommodating toner; and a drawer movable between an inside position where the drawer in its entirety is positioned inside the housing and an outside position where at least a part of the drawer is positioned outside the housing. The drum cartridge is attachable to and detachable from the drawer. The drawer includes: a side plate configured to receive the photosensitive drum; and a locking member supported by the side plate. The locking member is movable relative to the side plate between a locking position where the locking member locks the photosensitive drum to the side plate and an unlocking position where the locking member unlocks the photosensitive drum from the side plate in an attached state of the drum cartridge to the drawer.