Loop Brush Lubricant Application Mechanism for Image Forming Apparatus
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Solution Overview
Problem
Existing lubricant application methods for electrophotographic image forming processes face issues with uneven lubricant supply due to friction and polarity changes, leading to image noise and reduced image quality, particularly with the use of straight-bristle brushes which suffer from lubricant consumption and fiber concentration problems.
Innovation Solution
A loop brush design with regularly arranged loop-shaped fiber bundles wound at a specific angle to ensure consistent lubricant application, preventing streak noise and density variations by optimizing the arrangement line spacing and fiber distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a straight-bristle brush is used for lubricant application, then the brush structure is simple and easy to manufacture, but the lubricant supply becomes uneven due to fiber concentration and consumption
Solution Approach 1:
The patent applies curvature by forming fiber bundles into loop shapes rather than using straight bristles. The loop-shaped fiber bundles are wound around a shaft to create a cylindrical brush structure, which prevents fiber concentration and ensures uniform lubricant supply to the image carrier surface.
Solution Approach 2:
The patent transitions from a two-dimensional flat brush surface to a three-dimensional cylindrical structure by winding loop-shaped fiber bundles around a shaft. This dimensional change allows the brush to rotate and distribute lubricant uniformly across the image carrier surface.
2Manufacturing precision
If fiber density of the brush is increased to prevent uneven lubricant supply, then lubricant distribution improves, but toner accumulates in the brush and cleaning performance deteriorates
Solution Approach 1:
The loop-shaped fiber bundles create a cylindrical geometry that prevents toner accumulation. The curved structure allows toner to roll off easily during the brushing operation, maintaining cleaning effectiveness while providing uniform lubricant distribution.
Solution Approach 2:
The brush is designed to rotate dynamically during operation, which prevents static toner accumulation in the fiber bundles. The rotational motion continuously refreshes the brush surface contact with the image carrier, maintaining both lubricant uniformity and cleaning performance.
3Reliability
If lubricant amount is increased to ensure sufficient supply, then cleaning performance improves, but lubricant transfers to the carrier in the development device causing fog noise
Solution Approach 1:
The loop brush structure provides localized lubricant application only at the contact points between the brush and image carrier. This controlled local supply prevents excessive lubricant transfer to the development device while ensuring sufficient lubrication for cleaning performance.
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 loop brush ensures stable and even lubricant supply, reducing streak noise and extending lubricant durability, while maintaining effective toner transfer and cleaning performance without increasing fiber density, thus preventing brush contamination and maintaining image quality.
Implementation Method 1
a material for reducing a friction coefficient of an image carrier is supplied onto the image carrier... apply a lubricant made of fatty acid metallic salt such as zinc stearate onto a surface of the image carrier using a brush
Implementation Method 2
the reduction in toner particle size increases adhesion due to Van der Waals force between toner and the image carrier
Data Source
AI summary
A loop brush includes a shaft and a ribbon having loop-shaped fiber bundles arranged regularly on a base cloth. The ribbon is wound around the shaft at a prescribed angle. An arrangement angle that is an angle of an arrangement line, which is a straight line connecting adjacent fiber bundles, with respect to a longitudinal direction of the ribbon differs from a winding angle that is an angle of the longitudinal direction of the ribbon with respect to a circumferential direction of the shaft.