Charging Roller Oscillation Stabilization via Dual Biasing Guide
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The cleaning member in existing charging devices can cause the supporting member to vacillate or oscillate, leading to non-uniform image density in images formed on sheets due to the charging roller's instability.
Innovation Solution
A charging device with a charging roller, a supporting section, a guide, a first biasing section, and a second biasing section, where the supporting section is guided and biased to prevent oscillation, ensuring the charging roller maintains consistent contact with the image bearing member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cleaning member rotates through driving force of the drum gear, then the charging roller is cleaned, but the supporting member vacillates or oscillates causing non-uniform image density
Solution Approach 1:
A guide member is introduced as an intermediary component between the supporting member and the cleaning member. The guide member includes a guide surface that contacts the supporting member and constrains its movement, preventing vacillation and oscillation while allowing the cleaning operation to proceed effectively.
Solution Approach 2:
The guide surface is designed to provide uniform contact and distribution of forces on the supporting member throughout the cleaning cycle. This creates a balanced force distribution that eliminates unstable positions and prevents oscillation, ensuring consistent image density.
2Ease of operation
If the supporting member is pressed against the photosensitive member through spring member, then the charging roller is held in position, but the supporting member vacillates when the cleaning member rotates
Solution Approach 1:
The guide member acts as a mediator that stabilizes the supporting member's movement. It provides a constrained path for the supporting member while maintaining the spring's pressing function, eliminating vacillation without compromising positioning ease.
3Reliability
If the charging roller rotates passively in accompaniment to photosensitive member, then the charging roller maintains contact, but the charging roller vacillates or oscillates causing non-uniform image density
Solution Approach 1:
The guide member serves as an intermediary that stabilizes the charging roller's rotation. By constraining the supporting member's movement through the guide surface, the charging roller's passive rotation becomes stable and consistent, eliminating oscillation while maintaining contact.
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 reduces non-uniform image density by stabilizing the charging roller, allowing for smoother rotation of the photosensitive drum and improved image quality on sheets.
Implementation Method 1
The first biasing section biases the supporting section in the first direction to press the charging roller against the image bearing member
Implementation Method 2
The second biasing section biases the supporting section toward the guide
Data Source
AI summary
A charging device (51) includes a charging roller (65), a supporting section (71), a guide (73), a first biasing section (75), and a second biasing section (90). The charging roller (65) charges an image bearing member (50). The supporting section (71) supports the charging roller (65) such that the charging roller (65) is rotatable. The guide (73) guides the supporting section (71) in a first direction (D1). The first biasing section (75) biases the supporting section (71) in the first direction (D1) to press the charging roller (65) against the image bearing member (50). The second biasing section (90) biases the supporting section (71 toward the guide (73).