Swingable Developing Unit for Drum Cartridge Contact Stability
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Solution Overview
Problem
Existing process cartridges face issues in maintaining a stable contact state between the developing roller and the photosensitive drum due to deviations in the outer diameter of the developing roller, leading to inconsistent toner supply and waste toner management.
Innovation Solution
A process cartridge design where the developing unit is swingable about a virtual axis with respect to the photosensitive drum, ensuring proper contact and pressure for consistent toner supply, and includes a waste toner conveyance tube and storage chamber for efficient waste toner management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the developing roller is fixed to the photosensitive drum, then the structure is simple, but the contact state becomes unstable due to outer diameter deviation
Solution Approach 1:
The developing unit is made swingable about a swing axis instead of being fixed, allowing it to dynamically adjust its position. This dynamic configuration enables the developing roller to maintain proper contact with the photosensitive drum surface despite variations in outer diameter, resolving the contradiction between structural simplicity and contact stability.
2Ease of manufacture
If the developing roller outer diameter deviates, then manufacturing is easier, but toner supply consistency deteriorates
Solution Approach 1:
The swingable developing unit compensates for outer diameter variations through positional adjustment, allowing easier manufacturing of the developing roller while maintaining consistent toner supply to the photosensitive drum.
3Reliability
If the developing unit is swingable, then contact state stability is improved, but device complexity increases
Solution Approach 1:
The swingable mechanism provides a simple yet effective means of maintaining contact stability through controlled movement about a swing axis, achieving reliability improvement with minimal added complexity.
Data Source
AI summary
A process cartridge includes: a drum cartridge including a photosensitive drum; and a toner cartridge which is mountable on the drum cartridge and stores toner, wherein the drum cartridge includes: a cleaner configured to collect waste toner on the photosensitive drum; a waste toner conveyance tube configured to convey the waste toner collected by the cleaner; and a developing unit which includes a developing roller configured to supply toner to the photosensitive drum and is swingable about a swing axis with respect to the photosensitive drum, and wherein the toner cartridge has a waste toner storing chamber for storing the waste toner conveyed by the waste toner conveyance tube.