Developing Cartridge Contact Layout for Stable Electrical Alignment
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Solution Overview
Problem
Variations in the position of the electrical contact surface of the storage medium relative to the drum frame occur during manufacturing and assembly of developing cartridges, leading to potential misalignment and performance issues.
Innovation Solution
The developing cartridge design includes a photosensitive drum, transfer roller, and conveying roller, with the electrical contact surface exposed through an opening between the transfer and conveying rollers, ensuring precise alignment and minimizing positional variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electrical contact surface is separated farther from the developing roller, then the developing cartridge can accommodate more components, but the positional variation of the electrical contact surface increases
Solution Approach 1:
The patent repositions the electrical contact surface from a location distant from the developing roller to a position adjacent to it, specifically utilizing the space near the developing roller's end portion. This spatial reconfiguration in the longitudinal dimension reduces the accumulation of positional variations while still allowing adequate internal space for other components through optimized layout.
2Ease of operation
If the developing cartridge is made detachable, then ease of replacement is improved, but alignment precision between developing cartridge and drum frame deteriorates
Solution Approach 1:
The patent incorporates a positioning protrusion on the developing cartridge that engages with a corresponding positioning groove in the drum frame during attachment. This preliminary positioning action ensures accurate alignment of the electrical contact surface with the drum frame before the cartridge is fully installed, maintaining precision while preserving detachability.
3Manufacturing precision
If the electrical contact surface is positioned adjacent to the developing roller, then positional variation is suppressed, but the risk of short circuit increases
Solution Approach 1:
The patent introduces an insulating structure as an intermediary element between the electrical contact surface and the developing roller. This insulating barrier prevents direct electrical contact and short circuits while allowing the electrical contact surface to be positioned adjacent to the developing roller for precise alignment, thus resolving the contradiction between positional precision and electrical safety.
Data Source
AI summary
A drum cartridge includes: a drum frame to which a developing cartridge including a storage medium having an electrical contact surface is detachably attachable; a photosensitive drum; a transfer roller; and a conveying roller. The drum is rotatable about a first axis extending in a first direction and positioned at one end portion of the frame in a second direction. The transfer roller is rotatable about a second axis extending in the first direction and in contact with the drum. The conveying roller is rotatable about a third axis extending in the first direction and separated from the transfer roller in the second direction. A first opening of the frame is positioned between the transfer roller and the conveying roller in the second direction. The electrical contact surface is exposed to an outside through the first opening in a case where the developing cartridge is attached to the frame.