Charging Roller Resistance Uniformity via Segmented Removing Member
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Solution Overview
Problem
Charging devices with cleaning rollers face issues due to varying resistance values along the shaft, leading to charging differences caused by staining and deterioration, which affect the uniformity of the toner image density.
Innovation Solution
A charging device with a rotatable charging member and a removing member spirally wound around a core, which contacts the charging member to remove unnecessary materials, and a detecting unit to monitor the current flow between them, allowing for real-time detection and adjustment of resistance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cleaning roller is used to remove unnecessary material from the charging roller, then the charging uniformity is improved, but the resistance value varies along the shaft direction causing charging differences
Solution Approach 1:
The removing material is divided into multiple segments along the shaft direction of the charging roller. Each segment independently contacts and removes material from different positions along the charging roller shaft, ensuring uniform resistance distribution. The segmentation allows each portion to address local variations in staining and deterioration, maintaining consistent charging across the entire roller surface.
2Productivity
If the charging roller operates over time, then productivity is maintained, but the resistance value varies due to deterioration causing charging differences
Solution Approach 1:
The removing member is configured to continuously and automatically remove unnecessary material from the charging roller surface during operation. This preliminary action prevents the accumulation of stains and deterioration products before they can cause significant resistance variations, maintaining charging consistency throughout the operational lifecycle of the device.
Solution Approach 2:
The detecting unit continuously monitors the resistance value distribution along the shaft direction of the charging roller. This feedback mechanism detects variations caused by staining or deterioration in real-time, allowing the system to identify when removing action is needed and ensure the removing member operates effectively to maintain uniform resistance and charging consistency.
3Ease of operation
If staining varies along the shaft of the charging roller, then the charging device can operate, but the resistance value varies causing charging differences
Solution Approach 1:
The removing material is distributed along the shaft direction with different segments positioned to address local staining variations. Each segment of the removing material contacts the charging roller at a specific location, providing localized removing action tailored to the staining conditions at that position, thereby maintaining uniform resistance distribution despite varying staining patterns.
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 setup ensures consistent charging and image density by detecting and addressing resistance variations, maintaining image quality even as the charging roller deteriorates or stains.
Implementation Method 1
a detecting unit that detects a current flowing between the charging member and the removing member
Data Source
AI summary
A charging device includes: a charging member that is rotatable and has a peripheral surface to be in contact with a charging target and to which a voltage is to be applied for charging the charging target; a removing member that includes a core and a removing material spirally wound one to less than two times around the core and rotates and comes into contact with the charging member to remove an unnecessary material from the peripheral surface of the charging member; and a detecting unit that detects a current flowing between the charging member and the removing member.