Drum Cartridge Contact Positioning for Stable Electrical Connection
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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 attachment of the developing cartridge to the drum frame, leading to potential misalignment and performance issues.
Innovation Solution
The developing cartridge is designed with a specific configuration that includes a photosensitive drum, transfer roller, and conveying roller, with the electrical contact surface exposed through an opening in the drum frame, and the developing electrode positioned between the developing roller and agitator, ensuring precise alignment and consistent positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electrical contact surface is positioned distant from the developing roller, then the developing cartridge structure is more flexible, but the positional variation of the electrical contact surface increases
Solution Approach 1:
A positioning member is introduced as an intermediary component between the developing cartridge and drum frame. This positioning member features a positioning protrusion that fits into a positioning groove, serving as a mediator to transfer and stabilize the position of the electrical contact surface relative to the drum frame, thereby reducing positional variation while maintaining structural flexibility
2Ease of manufacture
If the electrical contact surface is positioned distant from the developing roller, then the developing cartridge can be more easily manufactured, but the reliability of electrical connection decreases
Solution Approach 1:
The positioning member acts as an intermediary that ensures reliable electrical connection by maintaining consistent positioning. The positioning protrusion and groove mechanism guarantees that the electrical contact surface remains at a precise, consistent location relative to the drum frame, ensuring reliable electrical connection while allowing flexible manufacturing of the developing cartridge
3Adaptability or versatility
If the electrical contact surface is positioned distant from the developing roller, then the developing cartridge design is more versatile, but the positional consistency during attachment decreases
Solution Approach 1:
The positioning member serves as a stable intermediary component that maintains positional consistency during attachment. The positioning protrusion fitting into the positioning groove creates a stable mechanical connection that ensures the electrical contact surface remains consistently positioned relative to the drum frame, regardless of variations in developing cartridge design
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.