Developing Cartridge Detection Gear Segmentation
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in accurately determining whether a developing cartridge is new or used, as existing detection mechanisms are not reliable in distinguishing between the two states, leading to potential issues with toner supply and printer performance.
Innovation Solution
The developing cartridge incorporates a detectable rotary member with a partly non-tooth gear portion and multiple detectable portions that interact with a detection mechanism, allowing for stable rotation and reliable detection of the cartridge's state through a series of rotational positions and engagements, enabling accurate determination of the cartridge's new or used status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a detection gear with an abutment projection is provided on the developing cartridge to detect whether the cartridge is new or used, then the cartridge state can be detected, but the detection accuracy is insufficient to reliably distinguish between new and used cartridges
Solution Approach 1:
The detection gear is divided into multiple functional segments: gear teeth for engagement, a non-tooth portion for disengagement, and multiple detectable portions (first, second, and third detectable portions) positioned at different angular locations. This segmentation allows the detection mechanism to generate multiple distinct detection signals during rotation, improving the reliability of cartridge state determination beyond what a single detection point could provide.
2Measurement precision
If the detection gear rotates through multiple positions with gear teeth and non-tooth portions to enable detection, then the detection mechanism can identify cartridge state, but the complexity of the detection mechanism increases
Solution Approach 1:
The detection gear serves multiple functions simultaneously: it transmits rotational motion from the agitator to the detectable portions, provides mechanical engagement through gear teeth, creates detection signals through the abutment projection passing by the sensor, and indicates cartridge state through the pattern of detections. This multi-functionality reduces the need for separate components and simplifies the overall mechanism while maintaining high detection capability.
3Power
If the gear teeth of the detection gear mesh with the gear teeth of the transmission gear for full circumference engagement, then power transmission is efficient, but the detectable portions cannot be properly positioned to enable state detection
Solution Approach 1:
The circumferential surface of the detection gear is segmented into distinct zones: gear teeth portions for power transmission engagement, a non-tooth portion for creating detection disengagement, and detectable portions positioned at specific angular locations. This segmentation allows the detection gear to perform both power transmission and state detection functions simultaneously without interference, as each zone serves its specific purpose during the rotation cycle.
Data Source
AI summary
A developing cartridge may include a rotary gear rotatable about one axis and a detection gear rotatable about another axis. The detection gear is configured to be not rotatable with the rotary gear in a case where the rotary gear rotates from a first rotational position to a second rotational position, while being configured to be rotatable with the rotary gear in a case where the rotary gear rotates from the second rotational position to a third rotational position.