Regulating Member Prevents Photosensitive Drum Damage
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Solution Overview
Problem
The existing electrophotographic image forming apparatuses suffer from damage to the electrophotographic photosensitive member during mounting and demounting of the process cartridge, as the side cover cannot be closed unless the guiding members are fully moved from position (III) to (II), potentially causing scars or permanent memories on the photosensitive member.
Innovation Solution
An electrophotographic image forming apparatus with a movable tray system and a regulating member that allows the main assembly door to close only when the tray is in a specific position, preventing the photosensitive member from being rubbed by the transfer belt during cartridge replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the side cover is closed before the guiding members are fully moved from position (III) to (II), then the door closing operation is simplified, but the electrophotographic photosensitive member develops scars and permanent memories due to rubbing by adjacent objects
Solution Approach 1:
A regulating member (intermediary device) is introduced between the door closing action and the guiding members movement. This regulating member prevents the door from being closed unless the guiding members have completed their movement from position (III) to (II), thereby mediating the interaction between door closure and cartridge positioning to eliminate damage to the photosensitive member
2Object-affected harmful factors
If the guiding members are fully moved from position (III) to (II) before door closing, then the photosensitive member is protected from damage, but the door closing operation becomes more complex and time-consuming
Solution Approach 1:
The regulating member performs a preliminary check of the guiding members' position before allowing door closure. This preliminary action ensures that the guiding members are in the correct position (II) before the door closing operation proceeds, preventing damage to the photosensitive member while maintaining an efficient operation flow
3Ease of operation
If the tray is not properly positioned before door closing, then the door can be closed more freely, but the photosensitive member comes into contact with the transfer belt causing damage
Solution Approach 1:
The regulating member acts as an intermediary that monitors the tray position and prevents door closure unless the tray is properly positioned. This mediation ensures that the photosensitive member remains isolated from the transfer belt during door closing operations, eliminating contact damage while maintaining operational efficiency
Data Source
AI summary
An electrophotographic image forming apparatus detachably mounts a process cartridge including an electrophotographic photosensitive drum and includes a frame having an opening; a door movable between closing and opening positions; a cartridge-carrying tray movable among a latent image formation position, a mounting and demounting position, and a movable position therebetween; and a regulating member movable between a regulating position for regulating movement of the door from the opening position to the position when the tray is beyond the movable position, and a permitting position for permitting movement of the door from the opening position to the closing position when the tray is at the movable position.