Cleaning Web Displacement Detection for Electrophotographic Apparatus
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Solution Overview
Problem
Conventional electrophotographic image forming apparatuses face challenges in accurately determining when to exchange the cleaning web, leading to inconsistent cleaning performance and potential toner contamination due to the ambiguity between first and second cut-away portions on the cleaning web.
Innovation Solution
The apparatus incorporates a mechanism with multiple displacing portions on the cleaning web, a detecting portion to identify the displacement of these portions, and a counting system to track the number of image forming processes, allowing for precise determination of when to prohibit or prompt the exchange of the cleaning web based on predetermined counts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two cut-away portions are provided on the cleaning web to detect web end and prevent erroneous feeding, then the reliability of web end detection is improved, but the complexity of discrimination between first and second cut-away portions increases, leading to inability to properly determine whether image formation should be prohibited
Solution Approach 1:
The system performs preliminary counting of image formation processes after the first cut-away portion is detected. This preliminary action establishes a baseline count that enables subsequent discrimination between genuine web end (second cut-away) and erroneous feeding events, resolving the complexity issue while maintaining reliability
Solution Approach 2:
The system uses feedback from the counting portion to determine whether to prohibit image formation. When the count exceeds a predetermined threshold, the system feedbacks that image formation should continue; otherwise, it prohibits image formation. This feedback mechanism resolves the discrimination complexity by providing a clear decision criterion
2Productivity
If the cleaning web is used while shifting the rubbing position by moving it in the longitudinal direction, then the cleaning performance is maintained for more sheets, but the cleaning performance cannot be continued when the cleaning web reaches the terminal
Solution Approach 1:
The system performs preliminary detection of the first cut-away portion to warn the user before the cleaning web reaches its terminal. This preliminary warning allows users to prepare for web replacement, ensuring consistent cleaning performance is maintained throughout the web's usable life without sudden performance degradation at the terminal
3Extent of automation
If the optical sensor detects the displacement of the detection flag to urge cleaning web exchange, then the web end detection is automated, but the system cannot properly discriminate whether subsequent cut-away portion detection represents web end or erroneous feeding
Solution Approach 1:
The automated system performs preliminary counting of image formation processes after detecting the first cut-away portion. This preliminary automated counting provides the basis for accurate subsequent discrimination, maintaining both automation and precision by establishing a reference state before evaluating later events
Solution Approach 2:
The system uses automated feedback from the counting portion to determine whether subsequent cut-away detections represent genuine web end or erroneous feeding. The feedback mechanism compares the current state against the preliminary count, automatically resolving the discrimination issue while maintaining high measurement precision
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures reliable and timely exchange of the cleaning web, maintaining image quality and reducing downtime by preventing toner contamination and improving usability and productivity.
Implementation Method 1
a detecting portion configured to detect the displacement of the contact portion at each of the displacing portions
Data Source
AI summary
An electrophotographic image forming apparatus includes: a rotatable member; a web; a mechanism; a contact portion; a plurality of displacing portions; a detecting portion; a notifying portion; a first counting portion; a prohibiting portion; and a second counting portion. The prohibiting portion prohibits an image forming process when the detecting portion detects displacement of the contact portion when the number of times of the image forming process counted by the second counting portion is less than a predetermined number. The notifying portion prompts an exchange of the web when the detecting portion detects the displacement of the contact portion when the number of times is not less than the predetermined number.