Charging Device Manual Cleaning Mechanism
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Solution Overview
Problem
Existing charging devices for electrophotographic image forming apparatuses require complex switching between automatic and manual cleaning modes, and manual cleaning is not feasible when the power is off, as the cleaning pad must be electrically returned to its home position.
Innovation Solution
A charging device with a detachable member allowing the driving device and conveying screw to be attached and detached, enabling manual cleaning by a handle after disengagement, with the cleaning member having a home position at the driving device side, allowing for manual operation without power and simple mode switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the cleaning pad is electrically returned to the home position using the conveying screw, then the cleaning pad can be positioned at the home position, but the manual cleaning mode cannot be switched when the power is off
Solution Approach 1:
The invention extracts the electrical return function from the conveying screw mechanism and separates it into an independent return mechanism. This allows the cleaning pad to be returned to the home position without requiring power to the conveying screw, enabling manual cleaning mode switching even when the power is off.
Solution Approach 2:
The invention introduces a return mechanism as an intermediary between the cleaning pad and the home position. This return mechanism can operate independently of the conveying screw's electrical drive, providing a reliable way to position the cleaning pad at the home position without requiring power.
2Manufacturing precision
If the conveying screw is used to move the cleaning member, then the cleaning member can be positioned accurately, but the structure becomes more complex
Solution Approach 1:
The invention segments the positioning function into two independent parts: the conveying screw for longitudinal movement and the return mechanism for positioning at the home position. This segmentation allows each component to have a specialized function, improving positioning accuracy while managing complexity through functional separation.
Solution Approach 2:
The conveying screw is designed to serve multiple functions: it conveys the cleaning member longitudinally and also works with the return mechanism to position the cleaning pad at the home position. This multi-functionality reduces the need for separate dedicated components, managing device complexity while maintaining positioning precision.
3Ease of operation
If the cleaning pad is returned to the home position electrically, then the cleaning pad can be reset, but the manual cleaning process becomes complicated
Solution Approach 1:
The invention extracts the electrical return function from the manual cleaning process and creates an independent return mechanism. This allows the cleaning pad to be returned to the home position through a simple mechanical action rather than a complicated electrical control sequence, simplifying the manual cleaning process while maintaining ease of 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
Enables seamless switching between automatic and manual cleaning modes without power, allowing for effective cleaning of the charging wire, including careful cleaning of dirty areas, and simplifies the manual cleaning process.
Implementation Method 1
a conveying screw in the shape of a shaft and engaged with the cleaning member by screw action, the conveying screw configured to move the cleaning member in a longitudinal direction of the discharging member and in an axial direction of the conveying screw when it is rotated
Data Source
AI summary
A charging device includes a discharging member, a cleaning member, a conveying screw engaged with the cleaning member by screw action and configured to move the cleaning member when it is rotated, a driving device configured to rotationally drive the conveying screw, a detachable member, and a handle provided on an end portion side opposite to the driving device side in a longitudinal direction of the conveying screw. The detachable member allows the driving device and the conveying screw to be detached from each other in a longitudinal direction of the conveying screw on a driving device side. The handle allows the cleaning member to be manually moved along the discharging member after the driving device and the conveying screw are disengaged by the detachable member. The cleaning member has a home position at the driving device side in the longitudinal direction of the conveying screw.