Variable Width Regulating Member for Developer Layer Control
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Solution Overview
Problem
In image forming apparatuses, the developer tends to accumulate and solidify near the ends of the regulating member, causing deformation and leakage, which affects the quality of the printed image due to increased developer height and contamination risks.
Innovation Solution
A developing unit with a regulating member having a bending portion that contacts the developing device and a variable width increasing rearward, along with sealing members to prevent leakage, and an extension portion with discharge holes to manage developer distribution, ensuring effective regulation and prevention of contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the regulating member maintains a uniform width to simplify manufacturing, then manufacturing precision is improved, but the regulating member deforms due to accumulated solidified developer at the ends
Solution Approach 1:
The regulating member is designed with a variable width structure where the width changes along the longitudinal direction. Specifically, the width at the end portions is greater than the width at the intermediate portions, creating local structural differences that accommodate the accumulation of solidified developer at the ends while maintaining the overall integrity and shape stability of the regulating member.
2Manufacturing precision
If the regulating member is positioned close to the sealing member to improve developer layer regulation, then manufacturing precision is improved, but developer leaks between the regulating member and sealing member
Solution Approach 1:
The regulating member employs a variable width design where the end portions have greater width than the intermediate portions. This local structural variation allows the regulating member to maintain adequate spacing from the sealing member at the critical end regions, preventing developer leakage while still achieving precise developer layer regulation at the intermediate portions where the width is narrower.
3Manufacturing precision
If the regulating member has a narrow width to improve developer layer regulation precision, then manufacturing precision is improved, but the structure becomes vulnerable to deformation from solidified developer pressure
Solution Approach 1:
The regulating member features a non-uniform width distribution where the end portions are wider and the intermediate portions are narrower. This design provides local reinforcement at the ends to resist the pressure from accumulated solidified developer, while maintaining narrow dimensions at the intermediate portions for precise developer layer regulation. The variable width structure thus simultaneously addresses both the precision control requirement and the structural strength requirement.
Data Source
AI summary
A developing unit provided in an image forming apparatus includes a regulating member that improves developer layer regulation performance. The developing unit is configured to feed developer to a photoconductor, on which an electrostatic latent image is formed, to form an image. The regulating member of the developing unit includes a bending portion contacting an outer peripheral surface of a developing device provided in a frame of the developing unit. The width of the regulating member is variable to increase rearward from the bending portion. The regulating member may further include an extension portion extending from the bending portion. Sealing members may be attached to both ends of the frame of the developing unit so as to contact the respective ends of the bending portion.