Developing Cartridge Relay Member for Protrusion Control
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Solution Overview
Problem
Conventional developing cartridges stop protrusion movement through disengagement between the gear and drive gear, limiting the structural options for achieving this functionality.
Innovation Solution
A developing cartridge design incorporating a casing, shaft, tubular member, and relay member, where the relay member moves between the gear and tubular member to stop protrusion movement without disengagement from the drive gear, utilizing engagements and recesses to control rotation positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gear disengages from the drive gear to stop protrusion movement, then the protrusion movement is stopped, but the structural options are limited and the device complexity increases
Solution Approach 1:
The relay member acts as an intermediary component between the gear and the tubular member. It transfers the rotational motion from the gear to the tubular member through engagement, and can disengage independently to stop the protrusion movement. This mediator approach allows the gear to continue rotating while controlling the tubular member's movement, providing a more flexible and less complex solution than direct gear disengagement.
2Reliability
If the gear disengages from the drive gear to stop protrusion movement, then the protrusion movement is stopped, but the adaptability is reduced
Solution Approach 1:
The system is segmented into independent functional components: the gear for receiving drive force, the relay member for transferring motion and controlling engagement, and the tubular member for housing the protrusion. This segmentation allows each component to perform its specific function independently, enabling the gear to rotate continuously while the relay member controls the engagement state with the tubular member, thus providing better adaptability.
Solution Approach 2:
The relay member is designed to be movable in the axial direction during gear rotation, dynamically changing its engagement state with either the gear or the tubular member. This dynamic behavior allows the system to adapt to different operational states, maintaining reliability in stopping protrusion movement while providing structural flexibility for various configurations.
3Productivity
If the relay member engages with both the gear and tubular member, then the tubular member rotates with the gear, but the relay member must be positioned precisely to control movement
Solution Approach 1:
The relay member is preliminarily positioned in an engaged state with the gear during assembly, ensuring that when the gear rotates, the relay member automatically engages with the tubular member to transmit the rotational motion. This preliminary positioning eliminates the need for precise active positioning during operation, as the engagement occurs automatically through the rotational motion itself.
Data Source
AI summary
In a developing cartridge, a tubular member is rotatable about an axis. The tubular member includes a protrusion extending along a portion of a peripheral surface of a shaft. The relay member is positioned between a gear and the tubular member. The relay member is movable in an axial direction of the shaft during rotation of the gear from a first rotational position to a second rotational position. In a case where the gear is at the first rotational position, the gear and the relay member engage with each other and the relay member and the tubular member engage with each other to rotate the tubular member. In a case where the gear is at the second rotational position, the engagement between the gear and the relay member or the engagement between the relay member and the tubular member is released.