Fluctuation Preventing Member for Developing Roller Distance Control
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Solution Overview
Problem
Image forming apparatuses face fluctuations in the distance between the image carrier and developing roller, leading to uneven development of latent images, which results in density irregularities and color differences in printed output.
Innovation Solution
Incorporation of a biasing member to attract the image carrier and developing roller closer, combined with a fluctuation preventing member interposed between them, which is designed to maintain a consistent distance using low-friction materials and elastic elements to adjust the repulsive force and prevent deflections, ensuring stable image development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a biasing member is used to attract the image carrier and developing roller closer, then the development effectiveness is improved, but the distance fluctuation between them increases
Solution Approach 1:
A fluctuation preventing member is introduced as an intermediary element between the image carrier and the developing roller. This member mediates the interaction between the two components, preventing direct contact while maintaining the biasing force, thereby reducing distance fluctuation and preventing defects such as image carrier scratches and developer contamination.
Solution Approach 2:
The invention changes the physical parameters of the system by introducing a fluctuation preventing member with specific elastic properties. This member has a predetermined hardness and elasticity that allow it to deform under biasing force, absorbing distance fluctuations and maintaining stable spacing between the image carrier and developing roller.
2Manufacturing precision
If the distance between image carrier and developing roller is reduced for better development, then image quality improves, but the risk of contact and defects increases
Solution Approach 1:
The fluctuation preventing member serves as a cushioning element positioned beforehand between the image carrier and developing roller. It prevents direct contact by absorbing potential impact forces, thereby cushioning against harmful effects such as image carrier scratches, developer contamination, and other contact-related defects before they can occur.
Solution Approach 2:
The fluctuation preventing member acts as a protective intermediary that separates the image carrier and developing roller, preventing direct harmful contact while maintaining the necessary proximity for effective development. This intermediary layer eliminates the harmful effects of direct contact.
3Stability of the object's composition
If elastic elements are added to adjust repulsive force, then distance stability improves, but device complexity increases
Solution Approach 1:
The fluctuation preventing member combines multiple functions into a single integrated component: it provides the elastic repulsive force, prevents distance fluctuation, and protects against contact defects. By merging these functions into one element rather than using separate components, the invention achieves distance stability without significantly increasing device complexity.
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 significantly reduces color difference (ΔE) and density unevenness, improving the development process by maintaining a consistent distance and adjusting repulsive forces to balance the biasing force, resulting in enhanced print quality and reduced DRS amplitude.
Implementation Method 1
a fluctuation preventing member interposed between the image carrier and the developing roller and prevents, along with the biasing member, a fluctuation in a distance between a surface of the developing roller and a surface of the image carrier
Data Source
AI summary
An image forming apparatus includes an image carrier, a developing roller, a biasing member, and a fluctuation preventing member. A latent image is formed on the image carrier. The developing roller is provided to face the image carrier and develops the latent image on the image carrier. The biasing member is provided on an outside of an end portion of the developing roller and biases the image carrier and the developing roller in a direction where the image carrier and the developing roller approach each other. The fluctuation preventing member is interposed between the image carrier and the developing roller and prevents, along with the biasing member, a fluctuation in a distance between a surface of the developing roller and a surface of the image carrier in a region where the image carrier and the developing roller face each other.