Non-Circular Bristles for Charging Roller Cleaning
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Solution Overview
Problem
Existing cleaning members for charging rollers in image forming apparatuses are inadequate in effectively removing toner and external additives from the charging roller surfaces, leading to residual contamination that affects image quality.
Innovation Solution
A cleaning member with bristles having non-circular cross-sections and projecting portions that can enter recesses on the charging roller surface, combined with a brush base, to scrape off and remove toner and external additives effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cleaning members with circular cross-section bristles are used, then the structure is simple and easy to manufacture, but the cleaning effectiveness is insufficient and cannot remove toner from recesses
Solution Approach 1:
The bristles are designed with a non-circular cross-section (specifically triangular or elliptical) instead of the conventional circular cross-section. This asymmetric shape creates projecting portions that can physically enter and scrape toner from the recesses on the charging roller surface, significantly improving cleaning effectiveness while maintaining manufacturing feasibility
Solution Approach 2:
The bristle structure is optimized with specific dimensional parameters: the tip diameter is controlled at 5-15 μm, the projecting portion width is 3-8 μm, and the projecting portion length is 10-30 μm. These localized dimensional variations enable the bristles to effectively access and clean recesses of specific depths and widths on the charging roller surface
2Area of stationary object
If bristles with larger size are used to increase cleaning coverage, then the cleaning area is improved, but the bristles cannot enter the recesses on the charging roller surface
Solution Approach 1:
The bristle dimensions are precisely controlled within specific ranges: tip diameter of 5-15 μm, projecting portion width of 3-8 μm, and projecting portion length of 10-30 μm. These parameter optimizations enable the bristles to simultaneously achieve small enough size to enter recesses while maintaining sufficient stiffness for effective scraping action
Solution Approach 2:
The cleaning member uses a composite structure combining bristles made of specific materials (nylon, polyester, or polypropylene with specified denier values) attached to a brush base. This composite design provides both the flexibility needed to access recesses and the mechanical strength required for effective cleaning
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 solution significantly reduces surface resistance and contamination on the charging roller, improving image quality by effectively removing residual toner and additives, as demonstrated by experimental results showing enhanced cleaning performance compared to conventional designs.
Implementation Method 1
The bristles each have a non-circular cross-section including a projecting portion that projects toward an outer periphery, at least the projecting portion having a size such that the projecting portion is capable of entering the recesses in the object to be cleaned
Data Source
AI summary
A cleaning member includes plural bristles including tips that come into contact with an object to be cleaned having a surface including recesses and projections; and a brush base to which the bristles are attached. The bristles each have a non-circular cross-section including a projecting portion that projects toward an outer periphery, at least the projecting portion having a size such that the projecting portion is capable of entering the recesses in the object to be cleaned.