Developing Cartridge Electrode Layout for Stable Power Transmission
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Solution Overview
Problem
Existing developing cartridges require complex electrode designs that contact both the developing roller shaft and the supply roller shaft, increasing the need for conductive materials and manufacturing costs.
Innovation Solution
The developing cartridge employs a non-metallic or electrically insulating material for the covering layer of the developing roller shaft, with an electrical contact surface connected to the layer thickness regulating member, and uses a conductive member to transmit power through the layer thickness regulating member, simplifying the electrode design and reducing the need for conductive materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode contacts both the developing roller shaft and the supply roller shaft to transmit power, then power transmission is achieved, but the structure becomes complicated and manufacturing cost increases
Solution Approach 1:
The electrode is divided into two separate independent electrodes: a first electrode that contacts only the developing roller shaft, and a second electrode that contacts only the supply roller shaft. This segmentation eliminates the need for a single complex electrode to contact both shafts, simplifying the overall structure while maintaining reliable power transmission to both components.
2Reliability
If the electrode contacts both the developing roller shaft and the supply roller shaft, then power transmission is achieved, but the manufacturing cost increases due to more conductive material
Solution Approach 1:
By segmenting the electrode into two separate electrodes, each with a simpler structure and fewer contact points, the total amount of conductive material required is reduced. This segmentation allows for more efficient use of conductive materials while ensuring that both the developing roller shaft and supply roller shaft receive adequate power transmission.
3Reliability
If a conductive material is used for the electrode, then power transmission is achieved, but the manufacturing cost is higher than using non-conductive material
Solution Approach 1:
The electrode structure applies local quality by using conductive materials only where necessary for power transmission (at the contact points with the shafts), while other parts of the cartridge can use cheaper non-conductive materials. This selective application of conductive materials minimizes cost while maintaining functional requirements.
Data Source
AI summary
A developing cartridge includes: a developing roller rotatable about a rotational axis extending in a first direction; a casing configured to accommodate developer therein; an input gear rotatable about a first axis extending in the first direction, the input gear being positioned at one side of the casing in the first direction; an electrode with an electrical contact surface. The developing roller has a developing roller shaft extending in the first direction, a covering layer covering a surface of the developing roller shaft, and an elastic layer rotating synchronously with the developing roller shaft; and the electrical contact surface is electrically connected to a component of the developing cartridge, and the covering layer is made of a non-metallic material or an electrically insulating material.