Dual Roll System for BCR Contamination and Wear Reduction
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Solution Overview
Problem
Conventional electrophotographic systems face challenges in extending the lifetime of bias-charge rolls (BCRs), photoreceptors, and delivery rollers due to contamination and wear issues, particularly in humid environments, leading to image quality degradation and mechanical damage.
Innovation Solution
A dual-roll system integrating a delivery roller and a cleaning foam roller in direct contact with the BCR surface, where the cleaning foam roller is positioned upstream to effectively remove contamination from the charging unit before it reaches the delivery unit, ensuring continuous delivery of functional materials to the photoreceptor and preventing additive accumulation on the delivery roll.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a single delivery roller is used to apply functional material to the BCR surface, then the delivery function is maintained, but contamination accumulates on the delivery roller surface reducing its lifetime
Solution Approach 1:
The patent combines the delivery roller and cleaning roller into a single integrated component. The delivery roller applies functional material to the BCR surface while the cleaning roller simultaneously removes contamination from the same surface, eliminating the need for separate components and extending the lifetime of the delivery system.
Solution Approach 2:
The integrated roller component performs multiple functions: it delivers functional material to the BCR surface and simultaneously cleans contamination from the surface. This multi-functionality allows a single component to address both material application and contamination removal, reducing system complexity and extending operational lifetime.
2Reliability
If a separate cleaning roller is added to remove contamination from the BCR surface, then contamination is reduced, but device complexity increases
Solution Approach 1:
The patent merges the delivery roller and cleaning roller into a single integrated component. This consolidation reduces the number of separate parts while maintaining both delivery and cleaning functions, thereby reducing device complexity while preserving cleaning effectiveness.
Solution Approach 2:
The integrated roller performs multiple functions (material delivery and contamination removal) within a single component, eliminating the need for separate dedicated cleaning and delivery rollers. This multi-functionality reduces the overall number of components in the system.
3Reliability
If the delivery roller continuously applies functional material to the BCR surface, then the photoreceptor function is maintained, but additive accumulation occurs on the delivery roller
Solution Approach 1:
The integrated cleaning roller component removes additive accumulation from the delivery roller surface simultaneously as the delivery roller applies functional material. This continuous cleaning action prevents additive buildup while maintaining the delivery function, allowing the system to operate longer without requiring replacement.
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
The dual-roll system significantly extends the lifetime of both the BCR and delivery rollers, maintaining image quality and reducing wear, with the photoreceptor system lasting over 2 million cycles without severe contamination or image defects.
Implementation Method 1
The cleaning foam roller is positioned upstream to effectively remove contamination from the charging unit before it reaches the delivery unit
Implementation Method 2
The delivery unit applies a layer of functional material to a surface of the charging unit and the charging unit in turn applies a layer of the functional material onto the surface of the photoconductive member
Implementation Method 3
The charge retentive surface, typically known as a photoreceptor, is electrostatically charged, and then exposed to a light pattern of an original image to selectively discharge the surface in accordance therewith
Data Source
AI summary
An image forming apparatus including an electrophotographic photoconductive member, a charging unit, a delivery unit and a cleaning unit. The charging unit is disposed in contact with the surface of the photoconductive member and the delivery unit disposed in contact with the surface of the charging unit. The delivery unit applies a layer of functional material to a surface of the charging unit and the charging unit in turn applies a layer of the functional material onto the surface of the photoconductive member. The cleaning unit is disposed in contact with a surface of the charging unit to clean the charging unit and reduce contamination of a surface of the delivery unit. The cleaning unit is disposed in an upstream direction of the delivery roller relative to a rotation direction of the charging unit.