Process Cartridge Charging Roller Cleaning for Uniform Toner Removal
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Solution Overview
Problem
Existing image forming apparatuses face challenges in uniformly removing toner and lubricant from charging rollers due to the use of toners with small particle diameters and spherical shapes, leading to resistance unevenness and abnormal images, as conventional cleaning methods fail to uniformly remove contaminants effectively.
Innovation Solution
The implementation of a charging roller with a resin layer as the outermost surface and a brush roller with fiber bristles that satisfy specific relational expressions (100 < X < 600 and 0.2 < Y < 0.6) ensures uniform removal of contaminants, where X is the product of fineness and density of the fiber bristles, and Y is the biting amount relative to the fiber length, allowing for random contact and effective cleaning without additional drivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cleaning methods are used on charging rollers, then the apparatus structure remains simple, but uniform removal of toner and lubricant contaminants is not achieved
Solution Approach 1:
The invention specifies precise parameter ranges for the brush roller: fineness (deniers) of 1.0-3.0, density (kF/inch²) of 80-150, and fiber length (mm) of 1.5-3.0. These parameter optimizations enable uniform contaminant removal without requiring additional driving mechanisms, resolving the contradiction between cleaning effectiveness and device simplicity.
2Manufacturing precision
If small particle diameter spherical toner is used, then image definition is improved, but uniform cleaning of the charging roller becomes difficult
Solution Approach 1:
The brush roller parameters (fineness 1.0-3.0 deniers, density 80-150 kF/inch², fiber length 1.5-3.0 mm) are specifically optimized to effectively remove small particle diameter spherical toner while maintaining image definition quality, resolving the contradiction between image sharpness and cleaning reliability.
3Manufacturing precision
If the brush roller has high fineness and density, then cleaning uniformity is improved, but the apparatus complexity increases
Solution Approach 1:
The invention defines specific parameter ranges for the brush roller (fineness 1.0-3.0 deniers, density 80-150 kF/inch²) that achieve uniform cleaning through material optimization rather than mechanical complexity. The relationship X = fineness × density should be 100-450, providing a quantitative guideline that balances cleaning effectiveness with manufacturing simplicity.
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 configuration effectively prevents the accumulation of contaminants on the charging roller, reducing the occurrence of abnormal images such as vertical black streaks over an extended period, maintaining image quality without increasing the apparatus size or complexity.
Implementation Method 1
a charging roller, which charges the electrostatic latent image bearer
Implementation Method 2
a brush roller, which cleans the charging roller and includes fiber bristles
Data Source
AI summary
A process cartridge includes an electrostatic latent image bearer, a charging roller, and a brush roller. The charging roller charges the electrostatic latent image bearer and includes a conductive support and a resin layer covering the conductive support and defining an outermost surface layer of the charging roller The brush roller cleans the charging roller and includes fiber bristles. The charging roller and the brush roller satisfy the following relational expressions 1 and 2:100<X<600Expression 10.2<Y<0.6Expression 2where X is a product of a fineness (deniers) and a density (kF/inch2) in the fiber bristles, and Y is a value obtained by dividing a biting amount (mm) of the brush roller with respect to the charging roller by an average of fiber lengths (mm) of the fiber bristles.