Charging Roller Brush with Tilted Bristles for Longitudinal Thrust
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Solution Overview
Problem
The contact DC charging technique in image forming apparatuses faces charging failures due to soiling of the charging roller, as external additives attach to its surface, and existing cleaning methods hinder smooth movement by applying a load, destabilizing the longitudinal positioning of the charging roller and photosensitive member.
Innovation Solution
A charging device configuration where a brush member cleans the charging roller, with the brush bristles tilted to provide a thrust in the same direction as the force received from the photosensitive drum, allowing stable longitudinal movement and positioning without additional cleaning mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brush member is used to clean the charging roller, then soiling of the charging roller is reduced, but a load occurs in the charging roller hindering smooth movement
Solution Approach 1:
The brush member is designed with asymmetric bristle orientation where bristles tilt in a specific direction relative to the charging roller rotation. This asymmetric configuration creates a thrust component that opposes the load from brush contact, enabling smooth longitudinal movement while maintaining cleaning function
Solution Approach 2:
The brush member has non-uniform bristle distribution with varying tilt angles and densities across different sections. The bristles are tilted at specific angles (e.g., 30-60 degrees) relative to the charging roller surface, creating localized thrust components that balance the cleaning load and enable smooth movement in the longitudinal direction
2Force
If the intersect angle between charging roller and photosensitive member is increased to increase thrust, then longitudinal positioning is improved, but abutment stability is destabilized
Solution Approach 1:
The brush member acts as an intermediary element between the charging roller and the cleaning mechanism. By tilting the bristles, the brush creates a thrust component that mediates the force balance, allowing stable abutment while providing sufficient longitudinal thrust for positioning
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 ensures stable and smooth movement of the charging roller, maintaining constant longitudinal positions and reducing soiling, thereby enhancing the reliability of the charging process.
Implementation Method 1
The brush member 10 cleans a surface 2b of the charging roller 2
Implementation Method 2
a contact DC charging technique uses a conductive charging member, in place of a corona charger, causes the charging member to abut on a photosensitive member, and evenly charges a surface of the photosensitive member
Implementation Method 3
a component of a force received by the charging member resulting from tilting of bristles in the brush member in the longitudinal direction
Data Source
AI summary
A charging member includes a force receiving portion that receives a force in a direction in which the charging member is moved in a longitudinal direction of the charging member while rotating. The charging member is in contact with a brush member at a place different from the place of the force receiving portion. A component of the force received by the charging member at the force receiving portion in the longitudinal direction and a component of a force received by the charging member resulting from tilting of bristles in the brush member are in the same direction.