Dual Developing Roller Groove Configuration for Image Density
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Solution Overview
Problem
Existing developing devices in image forming apparatuses face challenges in maintaining efficient developer transport and preventing stagnation and groove pitch unevenness, leading to issues like jamming and uneven image density.
Innovation Solution
A developing device with two rotatable developing rollers, where the second roller has more grooves than the first, optimized in terms of groove number and circumferential speed ratios, to enhance jamming resistance and prevent groove pitch unevenness, ensuring stable developer transport and improved image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of grooves on the second developing roller is increased, then developer transport efficiency and jamming resistance are improved, but device complexity increases
Solution Approach 1:
The developing roller surface is segmented into multiple grooves that extend axially, creating distinct developer transport paths. The second developing roller has more grooves than the first, dividing the developer flow into multiple streams to prevent stagnation and reduce jamming while maintaining controlled transport efficiency.
2Manufacturing precision
If the circumferential speed ratio between the two developing rollers is optimized, then developer distribution uniformity is improved, but control complexity increases
Solution Approach 1:
The system employs dynamic speed control where the circumferential speed ratio between the first and second developing rollers is adjusted to optimize developer distribution. The second roller rotates at a different speed than the first, creating a controlled velocity difference that ensures uniform developer flow and prevents groove pitch unevenness while managing the complexity through coordinated control.
3Manufacturing precision
If the distance between the developing roller and latent image holding member is precisely controlled, then image formation quality is improved, but positioning complexity increases
Solution Approach 1:
The developing roller is positioned at a precisely controlled distance from the latent image holding member to create optimal development conditions. This distance control ensures that the developer is transported and applied uniformly to the image carrier, achieving high image formation quality through controlled proximity while managing positioning complexity through precise mechanical alignment.
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 configuration effectively prevents developer stagnation and groove pitch unevenness, enhancing jamming resistance and image formation quality by ensuring consistent developer distribution and adherence on the latent image carrier.
Implementation Method 1
a magnet member which is fixedly disposed inside the transport member and generates magnetic force lines for holding the developer on the outer circumferential surface of the transport member through magnetic force
Data Source
AI summary
There is provided a developing device including a first developing roller that is disposed to be rotatable with a desired distance set between the first developing roller and an outer circumferential surface of a rotatable latent image holding member, transports a developer onto an outer circumferential surface thereof while holding the developer by magnetic force, and has a substantially cylindrical shape, and a second developing roller that is disposed to be rotatable with desired distances set between the second developing roller and the respective outer circumferential surfaces of the corresponding latent image holding member and the corresponding first developing roller at a position on the downstream side of the first developing roller in a rotation direction of the latent image holding member, transports the developer onto an outer circumferential surface thereof while holding the developer by magnetic force, and has a substantially cylindrical shape.