Drum Cartridge Separation Shaft for Developing Roller Alignment
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Solution Overview
Problem
Existing drum cartridges face challenges in accurately positioning the developing roller with respect to the photosensitive drum during separation and contact operations, leading to inefficiencies in image forming processes.
Innovation Solution
The drum cartridge incorporates a drum frame with a first and second metal frame, and first and second resin frames that include guides and separation contact surfaces, allowing the developing cartridge to move accurately between contact and separation positions through a separation shaft mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the developing cartridge is held loosely in the drum frame, then ease of operation is improved, but manufacturing precision deteriorates
Solution Approach 1:
The drum frame is segmented into metal frames and resin frames with distinct functions. The resin frame contains guides that segment the positioning function from the holding function, allowing the metal frame to focus on secure holding while the resin frame provides precise positioning through its guide structure.
Solution Approach 2:
The guide in the resin frame acts as an intermediary element between the developing cartridge and the metal frame. It mediates the positioning process by providing a constrained path for the cartridge to follow during attachment, ensuring accurate positioning without requiring complex locking mechanisms.
2Reliability
If the developing roller and photosensitive drum are separated, then reliability is improved, but manufacturing precision deteriorates
Solution Approach 1:
The separation shaft is designed to be movable rather than fixed, allowing it to dynamically adjust the position of the developing cartridge. This enables the system to transition between contact and separation states while maintaining alignment precision through the guide constraint, resolving the contradiction between separation capability and positioning accuracy.
Solution Approach 2:
The guide structure enables the developing cartridge to self-align during attachment and separation operations. As the cartridge moves along the guide path, it automatically positions itself correctly relative to the photosensitive drum, eliminating the need for complex external alignment mechanisms.
Data Source
AI summary
A drum cartridge includes a photosensitive drum and a drum frame holding the photosensitive drum. The drum frame is configured to hold a developing cartridge. The drum frame includes a first metal frame, a second metal frame, and a first resin frame between the first metal frame and the second metal frame. The developing cartridge includes a developing roller, a developing frame for holding the developing roller, and a separation shaft movable between a first position and a second position. The first resin frame includes a first guide configured to position the developing cartridge at an attachment position and a first separation contact surface configured to come into contact with the separation shaft when the separation shaft is located at the second position.