Developer Cartridge Detection Gear for Reliable New-Status Sensing
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Solution Overview
Problem
Conventional developer cartridges face challenges in reliably detecting the specification and new status due to limited rotation of the detection gear, which affects accurate identification and movement of the detection protrusion.
Innovation Solution
The developer cartridge incorporates a detection gear with a small-diameter and large-diameter gear portion, along with engagement portions and a protrusion, allowing for increased rotation and movement of the detection protrusion by switching the engagement between gear portions, enhancing detection reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detection gear is configured with only a single engagement portion, then the device complexity is reduced, but the rotation amount of the detection gear is limited, which reduces the movement amount of the protrusion and affects detection reliability
Solution Approach 1:
The detection gear is segmented into multiple engagement portions (first engagement portion and second engagement portion) with different diameters. Each engagement portion engages with different gear portions (small-diameter gear portion and large-diameter gear portion) to enable multi-stage rotation. This segmentation allows the detection gear to achieve greater total rotation amount while maintaining a compact structure, directly resolving the contradiction between detection reliability and device complexity.
Solution Approach 2:
The invention introduces a dimensional change by switching between different engagement portions at different axial positions. The first engagement portion and second engagement portion are arranged at different positions in the axial direction, allowing the detection gear to engage with different diameter gear portions sequentially. This multi-dimensional engagement approach enables increased rotation amplitude without proportionally increasing structural complexity.
2Reliability
If the detection gear rotates a larger amount, then the protrusion moves more, improving detection reliability, but the gear structure becomes more complex
Solution Approach 1:
The detection gear merges multiple engagement portions and different diameter gear portions into a single integrated rotational mechanism. The first engagement portion, second engagement portion, small-diameter gear portion, and large-diameter gear portion are combined in one detection gear assembly, allowing sequential engagement that multiplies the rotation amount. This merging approach achieves greater protrusion movement while avoiding the need for separate detection mechanisms, thus improving reliability without excessive complexity.
3Ease of operation
If the second engagement portion is positioned closer to the housing than the first engagement portion, then the engagement sequence is optimized for compact design, but the rotation speed change timing must be precisely controlled
Solution Approach 1:
The detection gear is designed so that the first engagement portion engages with the small-diameter gear portion first, initiating the rotation sequence. This preliminary engagement ensures that the detection gear begins rotating in the correct direction and at the appropriate speed before the second engagement portion engages with the large-diameter gear portion. This preliminary action simplifies the overall engagement process and reduces the precision requirements for simultaneous multi-point engagement.
Data Source
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Figure 2
Figure 3A~3B
AI summary
It is aimed to provide a developer cartridge provided with a detection gear having a novel structure. A first gear (transmission gear 400) includes a small-diameter gear portion 450 and a large-diameter gear portion 440 having a diameter larger than a diameter of the small-diameter gear portion 450. The second gear (detection gear 300) includes: a first columnar portion centered on a second axis CL2; a second columnar portion having a smaller diameter smaller than the first columnar portion; a first engagement portion (first gear portion 332) extending along a portion of a peripheral surface of the first columnar portion and engageable with the small-diameter gear portion 450; a second engagement portion (second gear portion 352) extending along a portion of a peripheral surface of the second columnar portion and positioned closer to a housing than the first engagement portion to the housing in an axial direction and engageable with the large-diameter gear portion 440; and a protrusion (detection protrusion 301) protruding in the axial direction and rotatable together with the first engagement portion and the second engagement portion. The second engagement portion is engageable with the large-diameter gear portion 440 after the first engagement portion is engaged with the small-diameter gear portion 450.