Developing Cartridge Conductive Member Positioning for Roller Stability
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Solution Overview
Problem
The instability in pressing the developing roller against the photosensitive drum due to contact between the power-supply terminal and the conductive bearing member in image forming apparatuses leads to degraded image quality.
Innovation Solution
A developing cartridge design where the conductive member is positioned vertically opposite to the developing cartridge receiving member, allowing the main body-side power-supply electrode to contact it from the side, thereby stabilizing the weight distribution and preventing rattling, ensuring a stable contact state between the electrostatic latent image carrier and the developer carrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the main body-side power-supply terminal contacts the conductive bearing member from below, then electrical connection is achieved, but the pressing stability of the developing roller against the photosensitive drum deteriorates
Solution Approach 1:
The conductive member is positioned asymmetrically at the opposite side of the case to the developing cartridge receiving member, creating an asymmetric weight distribution that prevents interference with the pressing mechanism while maintaining electrical connectivity
Solution Approach 2:
The contact point is moved from a vertical contact (from below) to a horizontal contact (from the side), changing the dimensional approach of the power-supply terminal to the conductive member, thereby avoiding interference with the pressing stability
2Stability of the object's composition
If the conductive member is positioned at the opposite side of the case, then pressing stability is improved, but the complexity of the device structure increases
Solution Approach 1:
The conductive member serves multiple functions: it provides electrical connection for the developing bias and simultaneously acts as a weight counterbalance to improve pressing stability, eliminating the need for separate components
Solution Approach 2:
The conductive member's positioning automatically achieves both electrical connectivity and pressing stability without requiring additional control mechanisms or adjustment devices
Data Source
AI summary
A developing cartridge is attachable to and detachable from an image forming apparatus and is received by a developing cartridge receiving member. The developing cartridge includes: a developer carrier including a rotational shaft; a case that rotatably supports the developer carrier, the case being capable of being supported by the developing cartridge receiving member; and a conductive member electrically connected to the rotational shaft of the developer carrier, at least a part of the conductive member is positioned at an opposite side of the case to the developing cartridge receiving member in a substantially vertical direction.