Process Cartridge Deformable Conductor for Electrode Wear Reduction
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Solution Overview
Problem
Conventional process cartridges experience frictional wear of the developing electrode due to its movement relative to the printer housing electrode, leading to electrical contact issues during the developing operation.
Innovation Solution
A process cartridge design incorporating a deformable third electrically conductive member that connects the drum unit and developing unit, reducing frictional wear by resiliently deforming to maintain contact between the developing roller and photosensitive drum, and ensuring stable electrical power supply through multiple conductive members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the developing unit is made movable relative to the drum unit to accommodate surface irregularities, then the developing roller can maintain contact with the photosensitive drum, but the developing electrode experiences frictional wear due to relative movement with the printer housing electrode
Solution Approach 1:
The patent makes the developing electrode movable relative to the printer housing electrode through a spring mechanism. This dynamic configuration allows the developing electrode to move together with the developing unit, maintaining electrical contact while eliminating relative frictional movement between the developing electrode and printer housing electrode, thus preventing wear and extending service life.
Solution Approach 2:
The patent introduces a spring as an intermediary element between the developing electrode and the printer housing electrode. This spring mechanism transmits the movement of the developing unit to the developing electrode, enabling coordinated movement that maintains electrical contact while preventing direct frictional contact between the developing electrode and the stationary printer housing electrode.
2Duration of action of stationary object
If a spring mechanism is used to make the developing electrode movable, then frictional wear is reduced, but the structure becomes more complex
Solution Approach 1:
The spring mechanism serves multiple functions simultaneously: it provides the movable connection between the developing electrode and printer housing electrode, transmits the movement of the developing unit to the developing electrode, maintains electrical contact, and eliminates frictional wear. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in structural complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces frictional wear and maintains consistent electrical contact, enhancing the durability and reliability of the process cartridge during pivotal movements and toner supply operations.
Implementation Method 1
a third electrically conductive member electrically connected to the first electrically conductive member and to the second electrically conductive member, the third electrically conductive member being deformable in accordance with the movement of the developing unit
Data Source
AI summary
A process cartridge has a drum unit having a photosensitive drum; a developing unit having a developing roller and movable relative to the drum unit; a first electrically conductive member provided at the drum unit and configured to contact a terminal of an image forming apparatus; a second electrically conductive member provided at the developing unit; and a third electrically conductive member electrically connected to the first electrically conductive member and to the second electrically conductive member, the third electrically conductive member being deformable in accordance with the movement of the developing unit.