Process Cartridge Locking Mechanism for Impact Resistance
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Solution Overview
Problem
In image forming apparatuses, process cartridges can jut out during strong impacts and vibrations, such as transportation, due to bending of the guide rail and elastic force counteraction, leading to disengagement of the hook engagement portion from the lock member and unintended movement.
Innovation Solution
The image forming apparatus incorporates a guiding member that moves the process cartridge longitudinally and a lock member that interlocks with the guiding member's movement, engaging with a recess on the cartridge to restrict its movement and prevent jutting out, using a configuration where the lock member moves in a lifting and lowering direction to secure the cartridge in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lock member is fixed to the main body frame and a hook-shaped portion is provided in the process cartridge, then the process cartridge can be locked in place during normal operation, but the process cartridge may jut out upstream when receiving strong impact forces during physical distribution
Solution Approach 1:
The lock member is changed from a fixed structure to a movable one that can shift in the lifting and lowering direction. This dynamic design allows the lock member to move and engage with the recess on the process cartridge, providing reliable locking during normal operation while accommodating impact forces during distribution without causing the cartridge to jut out.
2Manufacturing precision
If the guide rail is moved up and down to position the process cartridge, then the cartridge can be accurately positioned at the image forming position, but the cartridge position may be lowered due to guide rail bending under impact load
Solution Approach 1:
The lock member acts as an intermediary between the guide rail and the process cartridge. It transfers the positioning function from the guide rail to the lock member-recess engagement system, allowing accurate positioning while the lock member absorbs and accommodates impact forces, preventing direct transmission of guide rail bending to the cartridge position.
3Device complexity
If the lock member is fixed on the main body frame, then the structure is simple, but the lock engagement may fail under strong impact forces
Solution Approach 1:
The lock member is designed to move in the lifting and lowering direction rather than being fixed. This dynamic configuration adds minimal structural complexity while dramatically improving engagement reliability under impact conditions, as the movable lock member can engage with the recess and prevent the process cartridge from jutting out during physical distribution.
Data Source
AI summary
An image forming apparatus in which a process cartridge including a recess is configured in a detachable manner inside an apparatus main body, the image forming apparatus including, a guiding member guiding the process cartridge into the apparatus main body in a longitudinal direction, the guiding member moving up and down together with the process cartridge moving the process cartridge to an image forming position, and a lock member moving in a lifting and lowering direction intersecting a mounting direction of the process cartridge by interlocking with an up and down movement of the guiding member, in which the lock member moves in the lifting and lowering direction by interlocking with the upward movement of the guiding member, and the movement of the process cartridge in the longitudinal direction is restricted by the lock member engaging with the recess of the process cartridge.