Charging Device Cleaning Roller Axial Shift Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The spirally wound cleaning member in charging devices for photosensitive drums creates an uneven force distribution, leading to rotational imbalance and difficulty in smoothly rotating the cleaning body, which hampers effective cleaning of the charging roller.
Innovation Solution
A charging device design incorporating a pair of first supporting members for the charging roller, a pair of second supporting members for the cleaning roller, and a pair of elastic members that push back the cleaning roller, with a roller-shift preventing part to maintain balance and absorb vibrations, ensuring consistent contact and smooth rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the cleaning member is wound spirally around the shaft part, then the cleaning performance at axial end portions is improved, but the rotational balance is lost and the cleaning body cannot rotate smoothly
Solution Approach 1:
The patent introduces a counterweight portion on the shaft part that balances the uneven forces generated by the spiral cleaning member. This counterweight compensates for the force imbalance caused by the spiral winding, restoring rotational balance and enabling smooth rotation of the cleaning body while maintaining the high cleaning performance at axial end portions.
2Manufacturing precision
If the spiral cleaning member rotates while coming into contact with the charging roller, then cleaning action is achieved, but the cleaning roller shifts in the axial direction
Solution Approach 1:
The patent incorporates a roller-shift preventing part that acts in advance to counteract the axial shifting force generated by the rotating spiral cleaning member. This preliminary anti-action prevents the cleaning roller from shifting axially during operation, maintaining stable positioning while the cleaning member effectively cleans the charging roller surface.
3Force
If the cleaning body is designed with spiral winding to increase pressing force, then cleaning effectiveness is improved, but the rotational load becomes uneven and smooth rotation is hindered
Solution Approach 1:
The counterweight portion is specifically designed to offset the uneven rotational loads created by the spiral cleaning member's pressing action. By balancing these forces, the system maintains high cleaning effectiveness through the spiral winding while eliminating the rotational imbalance that would otherwise hinder smooth operation.
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 maintains a constant pressing force on the charging roller, effectively absorbs vibrations, and prevents shifting, allowing for improved cleaning performance and reduced occurrence of cleaning failures, uneven charging, and deformation.
Implementation Method 1
a pair of elastic members which push back the cleaning roller in a direction separate away from the charging roller
Data Source
AI summary
A charging device includes a charging roller, a cleaning roller, a pair of first supporting members, a pair of second supporting members and a pair of elastic members. The pair of first supporting members supports the charging roller in a rotatable manner. The pair of second supporting members supports the cleaning roller in a rotatable manner. The pair of elastic members is disposed between the first supporting members and the second supporting members, and pushes back the cleaning roller in a direction separate away from the charging roller. The second supporting member provided on one side in an axial direction of the cleaning roller has a roller-shift preventing part which blocks the cleaning roller. The elastic member provided on the one side in the axial direction pushes back the cleaning roller with force smaller than force of the elastic member provided on the other side in the axial direction.