Developing Roller Power Transmission via Bearing Mediator
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Solution Overview
Problem
Existing electrophotographic image forming apparatuses face issues with unstable support and rotation of the developing roller, leading to variations in the developing gap and toner supply, which affect image quality due to misalignment and deformation of the housing.
Innovation Solution
A developing device with a cylindrical developing roller supported by a housing, featuring a power transmission unit connected via a clearance fit and a bearing member to ensure stable rotation and maintain a consistent developing gap, preventing deformation and misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the developing roller is directly supported by the housing without a bearing member, then the structure is simpler, but the developing roller becomes unstable and deforms, causing variations in the developing gap
Solution Approach 1:
A bearing member is introduced as an intermediary component between the developing roller and the housing. This bearing member provides a stable support interface that maintains the developing roller's position and prevents deformation, thereby ensuring consistent developing gap without significantly complicating the overall structure.
2Device complexity
If the power transmission unit is restricted by the housing, then the housing structure is simpler, but the developing roller cannot rotate smoothly, affecting power transmission
Solution Approach 1:
The housing structure is segmented into distinct functional zones: a support region that provides structural stability and a clearance region that allows free rotation of the power transmission unit. This segmentation enables the housing to maintain simplicity while accommodating smooth rotation of the developing roller through the unrestrictive clearance fit design.
3Manufacturing precision
If the developing roller is tightly fixed in the housing, then the developing gap is more consistent, but radial forces cause housing deformation and misalignment
Solution Approach 1:
The bearing member serves as a mediator that absorbs and distributes radial forces generated during developing roller rotation. By positioning the bearing member between the developing roller and the housing, the design maintains consistent developing gap while preventing force transmission that would cause housing deformation or misalignment.
Data Source
AI summary
A developing roller including a housing containing toner; and a developing roller installed in the housing and supplies the toner to an electrostatic latent image formed on a photoconductor, the developing roller including a cylindrical unit in the form of a hollow pipe and a power transmission unit connected to one end of the cylindrical unit and connected to a power transmission member for rotating the developing roller. Both ends of the cylindrical unit are supported by the housing and the power transmission unit is not restricted by the housing. Both ends of the cylindrical unit are supported by the housing and the power transmission unit is not restricted by the housing.