Developing Cartridge With Movable Contact Holder for Gear Clearance
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Solution Overview
Problem
Existing developing cartridges do not consider the arrangement of a holder holding an electrical contact surface, leading to potential rubbing issues during attachment, and require a compact design that avoids contact with agitator gears.
Innovation Solution
A developing cartridge design with a movable holder positioned away from agitator gears, allowing the electrical contact surface to move relative to the casing without interference, while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a holder holding the electrical contact surface is added to prevent rubbing during attachment, then the reliability of electrical contact is improved, but the device complexity increases
Solution Approach 1:
The holder is designed as a separate component that can be attached to the casing, allowing the electrical contact surface to be isolated and protected independently from other components. This segmentation enables the holder to specifically address the rubbing issue without requiring a complete redesign of the entire developing cartridge structure.
Solution Approach 2:
The holder acts as an intermediary component between the electrical contact surface and the external environment (including the agitator gear). It provides a protective interface that prevents direct contact and rubbing between the electrical contact surface and other moving parts, while still allowing the necessary electrical connection to be made.
2Reliability
If the holder is positioned to avoid contact with the agitator gear, then the reliability of operation is improved, but the compactness of the design is reduced
Solution Approach 1:
The holder is positioned in a specific spatial relationship relative to the agitator gear, utilizing the three-dimensional space within the cartridge. By arranging the holder at one end of the casing and the agitator gear at another end, the design creates sufficient clearance in the longitudinal direction to prevent contact while maintaining overall compactness through efficient space utilization.
Solution Approach 2:
The holder is specifically positioned at one end of the casing, creating a localized protection zone for the electrical contact surface. This localized arrangement allows the protective function to be concentrated where needed without requiring the entire cartridge structure to be enlarged or redesign ed for clearance purposes.
3Ease of operation
If the holder is made movable relative to the casing, then the ease of attachment is improved, but the device complexity increases
Solution Approach 1:
The holder is designed with movable capability relative to the casing, transitioning from a static to a dynamic configuration. This allows the holder to move during the attachment process to accommodate variations in positioning and ensure reliable electrical contact, while the movement mechanism is kept simple through straightforward mechanical design.
Solution Approach 2:
The holder's movable design allows it to be preliminarily positioned during attachment before final securing. This preliminary action enables the holder to self-align and accommodate positioning tolerances, making the attachment process more forgiving and easier to perform without requiring precision alignment tools or complex adjustment mechanisms.
Data Source
AI summary
A developing cartridge includes: a casing; a developing roller rotatable about an axis extending in a first direction; a first agitator; an agitator gear; a first protrusion; a developing memory; a first electrical contact surface; and a first holder holding the first electrical contact surface. The agitator gear includes a large diameter gear and a small diameter gear positioned between the large diameter gear and the casing in the first direction. The first protrusion protrudes outward from one end of the casing in the first direction, and is positioned between the casing and the large diameter gear in the first direction. The first protrusion is positioned away from the small diameter gear. The first holder is positioned farther from the first protrusion than the large diameter gear is in the first direction. The first holder and the first electrical contact surface are movable relative to the casing.