Developing Cartridge Electrode Positioning for Stable Power
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Solution Overview
Problem
The existing developing cartridges in laser printers face issues with stable power feeding to the developing roller shaft due to torsion or rotation, leading to poor power supply when a drive force is transmitted from the main body of the image forming apparatus.
Innovation Solution
The design incorporates a contact plate and electrode member positioned to maintain stable contact with the developing bias terminal, even under torsion or rotation, ensuring consistent power supply to the developing roller shaft through the electrode member, which is supported by a bearing member and a conductive resin structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If drive force is transmitted from the main body of the image forming apparatus to the developing cartridge, then the developing roller can be driven, but the contact plate is displaced due to torsion or rotation, resulting in poor power supply
Solution Approach 1:
The contact plate is repositioned from a lateral position to a position on the end surface of the developing roller shaft. This dimensional change allows the contact plate to remain stationary relative to the shaft end, preventing displacement during rotation or torsion while maintaining reliable electrical contact for power supply.
2Reliability
If the input gear and feeding member are disposed on opposite sidewalls, then the gear mechanism can drive the developing roller, but the feeding member is placed out of position when the developing cartridge rotates or torsions, resulting in poor power feeding
Solution Approach 1:
The feeding member is repositioned from the sidewall to the end surface of the developing roller shaft, aligning it with the input gear's rotational axis. This spatial reconfiguration ensures that the feeding member remains in proper position during operation, maintaining stable power feeding while allowing the gear mechanism to function correctly.
Data Source
AI summary
A developing cartridge includes a case having a first sidewall and a second sidewall opposite to the first sidewall, and a developing roller disposed between the first sidewall and second sidewall. The developing roller can include a developing roller shaft and a developing roller member configured to carry a developing agent thereon, the developing roller member disposed around the developing roller shaft. Also, the developing cartridge can include an electrode disposed on the first sidewall adjacent to the developing roller shaft, the electrode electrically connected to the developing roller member, and a driven coupling disposed on the second sidewall. The electrode can include, an extending portion extending in a direction away from the first sidewall. An outermost periphery of the driven coupling defines a projection plane projecting in a direction towards the electrode, wherein at least a part of the extending portion is disposed within the projection plane.