Developing Roller Recess Geometry for Seal Contact Pressure
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Solution Overview
Problem
When a developing roller is miniaturized in width, the recess portion can interfere with the side seal, leading to weakened contact pressure and potential toner leakage due to bending of the roller.
Innovation Solution
The developing device incorporates a developing roller with a recess portion that has a specific geometry, including a first surface extending in the axis line direction and a second surface intersecting with it, positioned within the range of a seal member, ensuring a larger distance from the seal member's inner end to the second surface, which enhances the sealing range and maintains contact pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the developing roller is miniaturized in width, then the developing device size is reduced, but the contact pressure to the side seal is weakened causing developer leakage
Solution Approach 1:
The roller main body is designed with a recess portion that creates a specific local structure at the end surface. This local structural modification allows the roller to maintain adequate contact pressure with the side seal even when miniaturized, preventing developer leakage while preserving the compact size benefit.
Solution Approach 2:
The recess portion is positioned at a specific location in the axial direction of the roller, creating a multi-dimensional sealing arrangement. By strategically positioning the recess portion and seal member along the axial dimension, the design ensures proper sealing contact is maintained despite the reduced overall width of the developing roller.
2Temperature
If the recess portion is positioned at the end surface of the developing roller, then heat dissipation is improved, but the roller main body becomes easily bent weakening seal contact
Solution Approach 1:
The recess portion is designed with specific dimensional characteristics - it is recessed by a controlled amount (0.1-5.0 mm) from the end surface. This local structural feature provides heat dissipation pathways while the controlled depth maintains sufficient roller stiffness to prevent excessive bending that would compromise seal contact.
Data Source
AI summary
A developing device including: a housing; a developing roller including a roller main body having a recess portion recessed inwards in an axis line direction, the recess portion including, a first surface extending in the axis line direction, and a second surface extending from an inner end portion of the first surface towards a direction intersecting with the axis line direction; and a seal member arranged between the housing and the roller main body, wherein, in the axis line direction, the second surface is positioned within a range in which the seal member is arranged, and wherein, in the axis line direction, a distance from an inner end portion of the seal member to the second surface is larger than a length of a part at which the seal member and the first surface overlap with each other.