Developer Roller Surface Roughness for Stable Toner Collection
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Solution Overview
Problem
The risk of developer dragging and insufficient collection by the separating roller leads to variations in toner-to-developer ratio, causing image failures such as color variation in developed toner images, particularly at high processing speeds.
Innovation Solution
The development apparatus includes specific surface roughness and groove ratios for the first and second rollers, with 0.35×Rz1≤Rz2 and 7 μm ≤ Rz1≤15 μm, and 0.40×ρ1≤ρ2 and 0.07≤ρ1≤0.23, to enhance developer conveyance capability and prevent dragging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the separating sleeve has insufficient developer conveyance capability, then the structure is simpler, but the developer cannot be sufficiently collected leading to dragging phenomenon and image failure
Solution Approach 1:
The separating sleeve is designed with a specific surface roughness (Rz2) that is 0.35 times or more but less than the surface roughness (Rz1) of the development sleeve, creating localized optimal properties for developer conveyance without changing the overall structure
Solution Approach 2:
The invention changes the surface roughness parameter of the separating sleeve to a specific range (0.35×Rz1≤Rz2<Rz1) to improve developer conveyance capability while maintaining structural simplicity
2Reliability
If the surface roughness of the separating sleeve is too low, then the sleeve is easier to manufacture, but the developer conveyance capability is insufficient
Solution Approach 1:
The invention specifies a precise surface roughness parameter range (0.35×Rz1≤Rz2<Rz1) that balances manufacturability with functional performance, avoiding excessive processing while ensuring adequate developer conveyance
3Productivity
If the development sleeve rotates at high speed, then the productivity increases, but the used developer cannot be sufficiently collected leading to color variation in developed images
Solution Approach 1:
The separating sleeve is given distinct surface properties (roughness Rz2) optimized for high-speed developer collection, allowing the system to maintain image quality even at increased process speeds
Solution Approach 2:
By optimizing the surface roughness parameter of the separating sleeve, the system can operate at higher speeds without sacrificing developer collection efficiency or image quality
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 effectively suppresses developer dragging, maintaining consistent toner-to-developer ratios and improving image quality by ensuring thorough developer collection and conveyance, even at increased processing speeds.
Implementation Method 1
the development sleeve may bear developer on its surface through a magnetic force generated by the development magnet. Similarly, the separating roller may include a rotating separating sleeve and a non-rotating separating magnet arranged inside the separating sleeve, and the separating sleeve may bear developer on its surface through a magnetic force generated by the separating magnet
Data Source
AI summary
Disclosed is a development apparatus that includes a first roller to be supplied with developer accommodated in a first chamber, a first magnet, a second roller to which the developer is delivered from the first roller through a magnetic field generated by the first magnet, which is arranged to face the first roller, the second roller bearing and conveying the developer to collect the developer in a second chamber after the electrostatic latent image is developed, and a second magnet, in a case where ten-point average roughness of an outer circumferential surface of the first roller is Rz1 and ten-point average roughness of an outer circumferential surface of the second roller is Rz2, 0.35×Rz1≤Rz2 and 7 μm≤Rz1≤15 μm.