Developing Roller Coupling Structure for Friction-Held Alignment
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Solution Overview
Problem
In electrophotographic image forming apparatuses, the developing roller's alignment and power transmission are compromised during alienation and non-alienation states, leading to wear, environmental impact, and reduced customer satisfaction due to misalignment and power transmission issues.
Innovation Solution
The development cartridge employs a coupling structure with coupling pieces that utilize static friction and interference fits to maintain alignment during installation, allowing disengagement with sufficient force for state changes, ensuring reliable power transmission in both alienated and non-alienated positions without the need for additional urging members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the developing roller is allowed to move between alienated and non-alienated states, then the photoconductor surface can be protected from wear, but misalignment and power transmission issues occur during state transitions
Solution Approach 1:
The coupling structure incorporates a dynamic design where the coupling piece can rotate relative to the drive gear, allowing the developing roller to transition between alienated and non-alienated states. This dynamic coupling maintains reliable power transmission during state transitions while enabling the photoconductor to be protected from wear during idle periods.
Solution Approach 2:
The coupling structure acts as an intermediary mechanism between the drive gear and the developing roller shaft. It mediates the power transmission during state transitions, ensuring that misalignment does not compromise reliability while still allowing the developing roller to move between states for photoconductor protection.
2Manufacturing precision
If a coupling structure is designed to maintain alignment during installation, then alignment reliability is improved, but the structure becomes more complex requiring additional urging members
Solution Approach 1:
The coupling structure utilizes the rotational movement of the developing roller itself to achieve proper alignment and engagement. The coupling piece naturally aligns with the drive gear during the rolling motion, eliminating the need for separate urging members or complex alignment mechanisms. The system serves its own alignment function through its operational movement.
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 solution ensures proper alignment and power transmission in the developing roller, reducing wear, minimizing environmental impact, and enhancing customer satisfaction by maintaining reliable operation across different states.
Implementation Method 1
The development cartridge employs a coupling structure with coupling pieces that utilize static friction and interference fits to maintain alignment during installation
Implementation Method 2
The development cartridge employs a coupling structure with coupling pieces that utilize static friction and interference fits to maintain alignment during installation
Data Source
AI summary
An image forming apparatus includes a development cartridge having a developing roller. The developing roller includes a roller body, and a shaft to pass through a central axis of the roller body. A coupling structure is disposed at an end part of the shaft, is movable from a first position to a second position, and includes a first coupling piece and a second coupling piece. Positions of the first coupling piece and the second coupling piece are maintained with respect to one another by a static frictional force between surfaces of the first coupling piece and the second coupling piece to hold the coupling structure in the first position. When a predetermined force overcomes the static frictional force, the first coupling piece and the second coupling piece disengage from one another to allow the coupling structure to move from the first position to the second position.