Exposure Device Retraction Locking Mechanism for Cartridge Replacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In image forming apparatuses, the LED units are prone to damage due to the movement of the support member, which can close the upper door even when the cartridges are out of their image forming positions, preventing safe replacement and maintenance.
Innovation Solution
The support member for the exposure device is moved to retract it from the photosensitive member, allowing the cartridge holding member to be drawn out for replacement, with locking mechanisms ensuring the exposure device remains safe from damage during cartridge replacement by preventing the upper door from closing until the LED units are retracted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the support member is moved to retract the exposure device from the photosensitive member, then the LED units are protected from damage during cartridge replacement, but the structure complexity increases due to the need for locking mechanisms
Solution Approach 1:
The exposure device is retracted to a safe position before the cartridge holding member is drawn out for replacement. The locking mechanism engages the locked state when the support member is in the retracted position, preventing the upper door from closing and protecting the LED units before any cartridge replacement operation begins
Solution Approach 2:
A locking mechanism acts as an intermediary between the support member position and the upper door closure. The locking mechanism includes a locking member that engages with a locking groove, serving as a mediator that physically prevents the upper door from closing when the exposure device is retracted, thus protecting the LED units without requiring direct sensing or control systems
2Reliability
If the upper door is prevented from closing when cartridges are out of position, then LED units are protected from damage, but the ease of operation decreases due to additional locking constraints
Solution Approach 1:
The locking mechanism is designed to automatically engage and disengage based on the position of the support member. When the support member is moved to the retracted position, the locking mechanism self-activates to prevent upper door closure. When the support member returns to the operational position, the locking mechanism self-disengages, allowing normal door closure. This eliminates the need for manual intervention or complex control systems
Solution Approach 2:
The locking mechanism transitions between locked and unlocked states dynamically based on the support member position. The locking member can engage with or disengage from the locking groove depending on whether the exposure device is retracted or in its operational position, providing adaptive protection without restricting legitimate operations
3Reliability
If the exposure device is retracted before cartridge replacement, then LED units are protected from damage, but the productivity decreases due to additional movement time
Solution Approach 1:
The exposure device retraction is performed as a preliminary action before cartridge replacement begins. By automatically retracting the exposure device when the cartridge holding member is drawn out, the system prepares the protective state in advance, ensuring LED units are protected before any potential damage risk occurs
Solution Approach 2:
The locking mechanism maintains continuous protection throughout the entire cartridge replacement process. From the moment the support member retracts until it returns to the operational position, the locking mechanism continuously prevents upper door closure, ensuring uninterrupted protection without requiring repeated actions or interruptions
Data Source
AI summary
An image forming apparatus includes an exposure device exposing a photosensitive member, an exposure device support member supporting the exposure device, a cartridge holding member holding a cartridge which includes the photosensitive member, and a locking mechanism to prevent the cartridge holding member from being drawn out from the main body of the apparatus. The locking mechanism includes a locking member that is movable between a locking position at which the locking member is engaged with the cartridge holding member and an unlocking position at which the locking member is disengaged from the cartridge holding member, and an interlocking mechanism having an urging member urging the locking member so it is located at the locking position, and a pressing member that is displaced along with the movement of the exposure device support member and presses the locking member against an urging force of the urging member so as to move the locking member to the unlocking position.