Developing Cartridge Bearing Integration for Fewer Parts
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Solution Overview
Problem
Conventional developing cartridges require multiple separate components for positioning the developing roller, supplying bias voltage, and receiving a pressing force, leading to an increased number of parts.
Innovation Solution
Integration of a single component, the first bearing, which serves as a bearing, positioning member, and developing electrode, reducing the number of parts by combining these functions into a single unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate components are provided for positioning the developing roller, supplying bias voltage, and receiving pressing force, then each function can be performed reliably, but the number of parts in the developing cartridge increases
Solution Approach 1:
The patent combines three separate functional components (positioning member, developing electrode, and pressing force receiving member) into a single integrated bearing structure. The bearing includes a positioning portion that contacts the photosensitive drum to position the developing roller, a developing electrode portion that supplies bias voltage to the developing roller shaft, and a pressing force receiving portion that receives pressing force during separation. This integration maintains all required functions while reducing the number of parts.
Solution Approach 2:
The bearing is designed as a multi-functional component that simultaneously performs positioning, electrical connection, and force reception functions. The positioning portion establishes the correct position of the developing roller relative to the photosensitive drum, the developing electrode portion provides electrical connection for bias voltage supply, and the pressing force receiving portion accepts pressing force when the developing roller separates from the photosensitive drum. This universal design eliminates the need for multiple separate components.
2Reliability
If multiple separate components are used, then each component can be optimized for its specific function, but assembly and maintenance become more complex
Solution Approach 1:
The patent integrates multiple optimized functions into a single bearing structure, where the positioning portion, developing electrode portion, and pressing force receiving portion are all incorporated into one component. This reduces assembly complexity by eliminating the need to assemble multiple separate components while maintaining functional optimization through dedicated portions within the integrated structure.
3Reliability
If multiple separate components are provided, then redundancy can improve reliability, but the developing cartridge becomes harder to maintain
Solution Approach 1:
The patent combines multiple functions into a single maintainable unit. While the bearing contains multiple functional portions (positioning, electrical connection, force reception), they are integrated into one component that can be maintained as a single unit, simplifying repair procedures compared to managing multiple separate components.
Data Source
AI summary
A developing cartridge may include a developing roller, a casing capable of containing a developer therein, a developing electrode movable with the casing and the developing roller and pivotable about a developing roller shaft of the developing roller in a direction, a first lever movable relative to the casing, and a holder configured to hold the first lever relative to the casing, in case where the developing electrode pivots from one side of the direction to an other side of the direction, the first lever stops the pivotable movement of the developing electrode from one side of the direction to the other side of the direction and the holder prevents the first lever from coming off the holder from the one side of the direction to the other side of the direction.