Photosensitive Drum Rotation for Cartridge-Change Soiling Inspection
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Solution Overview
Problem
In image forming apparatuses, soiling on the surface of the photosensitive drum can occur due to sebum or dust adherence during cartridge replacement, leading to toner deposition and image defects.
Innovation Solution
The apparatus includes a configuration allowing partial exposure of the photosensitive drum surface for easy visual inspection and a control mechanism to rotate the drum while the cover is open, preventing contamination and enabling manual cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the photosensitive drum surface is kept enclosed during operation, then contamination from sebum and dust is prevented, but soiling cannot be detected and cleaned timely
Solution Approach 1:
The patent implements a preliminary action by rotating the photosensitive drum in a predetermined direction after detecting soiling, before the soiling causes image defects. The control unit rotates the drum to expose different surfaces to the user for inspection and cleaning, preventing the soiling from affecting image quality.
Solution Approach 2:
The patent uses the drum rotation mechanism as an intermediary to bridge the gap between soiling detection and cleaning. By rotating the drum, the system enables the user to visually inspect and manually clean the photosensitive surface without requiring complex automated cleaning mechanisms.
2Ease of repair
If the opening/closing member is opened for cartridge replacement, then maintenance operation is enabled, but soiling adheres to the photosensitive drum surface
Solution Approach 1:
The patent applies preliminary action by rotating the photosensitive drum after the opening/closing member is opened, before the user completes the cartridge replacement or maintenance operation. This ensures that any soiling that adheres during the maintenance process is immediately visible and can be cleaned.
Solution Approach 2:
The patent implements feedback by providing real-time visual access to the photosensitive drum surface through the opened covering, allowing the user to immediately see and respond to any soiling. The control unit can also provide feedback signals to indicate when the drum has rotated to expose specific areas for inspection.
3Productivity
If the photosensitive drum rotates at normal operating speed, then image formation is completed efficiently, but soiling on the surface cannot be visually inspected
Solution Approach 1:
The patent applies dynamics by changing the rotation speed of the photosensitive drum from normal operating speed to a slower, inspectable speed when the opening/closing member is opened. This dynamic adjustment allows the user to visually inspect the drum surface while maintaining efficient image formation during normal operation.
Solution Approach 2:
The patent implements periodic action by rotating the photosensitive drum in periodic intervals after soiling is detected, rather than continuously. The control unit rotates the drum for a predetermined time or number of revolutions to expose different surfaces for inspection, then returns to normal operation.
Data Source
AI summary
An image forming apparatus includes an image bearing member configured to rotate, a unit capable of taking a first state in which a part of a surface of the image bearing member is allowed to be exposed to an outside of the image forming apparatus, and a second state in which the surface of the image bearing member is not exposed to the outside of the image forming apparatus, a drive source configured to drive the image bearing member, and a control unit configured to control the drive source, the control unit being configured to execute a mode in which the image bearing member is rotated by the drive source while the unit is in the first state.