Developing Cartridge Protruding Portions Stabilize Pressing Force
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Solution Overview
Problem
Conventional developing cartridges experience unstable pressing direction due to vibrations, leading to inconsistent contact pressure with the photosensitive drum during mounting.
Innovation Solution
The developing cartridge design incorporates a first and second protruding portion on the gear covers, which receive and stabilize the pressing force from the pressing member, ensuring consistent contact pressure with the photosensitive drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the pressing member presses the frame directly, then the pressing force is applied, but the pressing direction becomes unstable due to vibrations
Solution Approach 1:
The patent introduces protruding portions as intermediary elements between the pressing member and the frame. These protruding portions serve as mediation points that receive and transmit the pressing force, ensuring stable and consistent contact pressure between the developing roller and the photosensitive drum while eliminating the instability caused by direct pressing on the frame
2Stress or pressure
If the pressing force is applied to the frame, then contact pressure is generated, but the contact pressure becomes inconsistent due to vibrations
Solution Approach 1:
The protruding portions act as intermediary elements that receive the pressing force from the pressing member and transmit it to the frame in a controlled manner. This mediation ensures that the contact pressure between the developing roller and the photosensitive drum remains consistent and reliable, eliminating the pressure fluctuations caused by vibrations
3Ease of operation
If the pressing member presses the frame, then the developing cartridge is pressed toward the photosensitive drum, but the mounting reliability is reduced due to unstable pressing direction
Solution Approach 1:
The protruding portions serve as stable intermediary points that ensure consistent transmission of the pressing force during the mounting process. By providing fixed and reliable contact points, they enhance the overall mounting reliability while maintaining ease of operation, as the pressing member can reliably engage with these protruding portions
Data Source
AI summary
A first gear cover has a first cover portion that covers an outer peripheral surface of a joint and that protrudes from a third outer surface in a first direction. A gear rotates about a third axis extending in the first direction by receiving driving force from coupling, and is located at a second outer surface. A second gear cover covers at least part of the gear, and has a second cover portion protruding in the first direction, and is located at the second outer surface. A first protruding portion protrudes from the first cover portion in a second direction, and is located at an opposite side from the developing roller with respect to the joint in the second direction. A second protruding portion protrudes from the second cover portion in the second direction, and is located at a same position as the first protruding portion in the second direction.