Developing Cartridge Rotary Detection Mechanism
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Solution Overview
Problem
Conventional developing cartridges in image forming apparatuses, such as laser printers, face challenges in efficiently detecting whether a new or used cartridge is mounted, often relying on complex mechanisms that increase manufacturing costs and complexity.
Innovation Solution
A developing cartridge design featuring a detectable rotary member with a partly non-tooth gear portion and multiple detectable portions that rotate to different positions, allowing detection by a sensor to determine the cartridge's status without requiring a clutch mechanism, thus simplifying the detection process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a detection gear with abutment projection is used to determine cartridge status, then detection accuracy is improved, but device complexity increases due to the need for clutch mechanisms and complex gear arrangements
Solution Approach 1:
The patent extracts the essential detection function from the complex gear system by using a simple rotary member with detectable portions that can be directly sensed. The detection mechanism is simplified to a sensor that detects the rotary member's position, eliminating the need for complex clutch mechanisms while maintaining detection accuracy.
Solution Approach 2:
The patent replaces the complex mechanical detection system (detection gear with abutment projection and clutch mechanisms) with a simpler mechanical rotary member that has detectable portions. This substitution reduces the mechanical complexity while achieving the same detection purpose through a more straightforward design.
2Reliability
If complex detection mechanisms are used to determine new or used cartridges, then detection reliability is improved, but manufacturing cost increases
Solution Approach 1:
The rotary member is segmented with multiple detectable portions at different positions, allowing the system to determine both cartridge presence and whether it is new or used through a single simple component. This segmentation approach maintains high reliability while avoiding the need for expensive complex mechanisms.
Solution Approach 2:
The simple rotary member serves multiple functions: it indicates cartridge presence, determines if the cartridge is new or used, and can be integrated into the existing drive mechanism. This multi-functionality reduces manufacturing costs by eliminating the need for separate complex detection systems.
3Ease of operation
If a detectable rotary member with multiple detectable portions is used, then ease of operation is improved by simplifying the detection process, but the rotary member structure becomes more complex
Solution Approach 1:
The rotary member has a simple overall structure, but includes localized detectable portions (such as protrusions or keyways) at specific positions. This local differentiation provides the necessary detection information without complicating the entire rotary member structure, maintaining ease of operation while limiting structural complexity to essential areas.
Data Source
AI summary
A developing cartridge is provided. The developing cartridge includes a housing which accommodates developer therein, a receiving member provided which couples with a force output member of an image forming apparatus to receive a driving force, a developing roller which rotates by the driving force received by the receiving member; a detectable rotary member having a first detectable portion and a second detectable portion and rotates by the driving force from a first rotational position where the first detectable portion is detected by a detection member provided in the image forming apparatus to a second rotational position where the second detectable portion is detected by the detection member, and a cut-off mechanism which cuts off a transmission of the driving force from the receiving member to the detectable rotary member in a state where the detectable rotary member is positioned in the second rational position.