Fur-Brush Supplying Roller Nip Design for Low-Stress Toner Transfer
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Solution Overview
Problem
Existing image forming apparatuses face issues with toner stress at contact areas between components, leading to image defects and reduced lifespan of developing cartridges, particularly in non-magnetic one-component and magnetic one-component contact development systems.
Innovation Solution
The use of a fur-brush type supplying roller that minimizes toner stress by forming a controlled nip with the developing roller, with specific groove depth, nip depth, and fur-brush density settings to enhance toner layer control and reduce image defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional supplying roller is used, then toner supply is achieved, but toner stress occurs at contact areas causing image defects and reduced cartridge lifespan
Solution Approach 1:
The patent applies parameter changes by precisely controlling the groove depth (0.5-10 μm), nip depth (100-350 μm), and fur-brush density (83% or higher) of the supplying roller to optimize toner transfer while minimizing stress concentration at contact areas
Solution Approach 2:
The patent implements local quality by creating a fur-brush type supplying roller with specific local characteristics (fur-brush structure, controlled density, and groove patterns) at the contact area to distribute toner stress locally rather than uniformly, preventing stress concentration
2Manufacturing precision
If groove depth is increased to improve toner layer control, then toner supply is enhanced, but toner stress increases causing image defects
Solution Approach 1:
The patent optimizes the groove depth parameter within a specific range (0.5-10 μm) to achieve adequate toner layer control without excessive stress. This parameter optimization balances toner supply efficiency with stress minimization to prevent image defects
3Manufacturing precision
If nip depth is increased to improve toner transfer, then toner supply is enhanced, but compression set occurs reducing fur-brush recovery
Solution Approach 1:
The patent controls the nip depth within a specific range (100-350 μm) to achieve adequate toner transfer while preventing excessive compression of the fur-brush structure. This parameter control ensures the fur-brush maintains its recovery ability after compression cycles
4Manufacturing precision
If fur-brush density is increased to improve toner supply, then toner transfer is enhanced, but compression set increases causing image defects
Solution Approach 1:
The patent specifies a fur-brush density of 83% or higher while controlling the nip depth to prevent excessive compression. This parameter combination ensures adequate toner supply capability while maintaining fur-brush structural integrity and minimizing compression set that would cause image defects
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 extends the life span of the developing cartridge by reducing toner stress, minimizing image defects such as vertical streaks, side stains, and toner yield fluctuations, while maintaining consistent image quality.
Implementation Method 1
a supplying roller in form of a fur-brush supplying roller (104) to form a nip with the developing roller (102) to supply the developer to the developing roller (102)
Data Source
AI summary
A cartridge to contain a developer includes a developing roller to carry the developer and a fur-brush type supplying roller to form a nip region with the developing roller to supply the developer to the developing roller. A surface layer of the developing roller includes a groove formed on the surface layer to come into contact with the fur-brush type supplying roller.