Developing Cartridge Lock Rib Positioning for Engagement Stability
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Solution Overview
Problem
Conventional developing cartridges face issues with maintaining engagement of the lock rib with the drum cartridge, leading to potential detachment due to displacement caused by driving force applied to the coupling, resulting in insufficient stabilization of the engagement between the lock lever and the lock rib.
Innovation Solution
The developing cartridge is designed with a casing that includes a developing roller, a coupling, a coupling gear, a detection gear, an agitator, a first gear cover, a second gear cover, and a lock rib, where the lock rib is positioned opposite to the detection gear and configured to lock with the drum cartridge, ensuring stable engagement even when the cartridge is displaced due to driving force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the coupling and lock rib are both provided at one end surface of the frame, then the structure is simplified, but the lock rib may be displaced relative to the lock lever away from the lock lever when the coupling is pressed due to input of driving force
Solution Approach 1:
The patent divides the frame into multiple sections along its length, positioning the coupling at one end surface and the lock rib at the other end surface. This spatial segmentation separates the driving force input point from the locking engagement point, preventing displacement of the lock rib relative to the lock lever when driving force is applied to the coupling.
2Reliability
If a sufficient engagement area between the lock lever and lock rib is provided, then engagement stability is improved, but the device complexity increases
Solution Approach 1:
The patent transitions from providing engagement stability through increased area (two-dimensional solution) to providing stability through optimized spatial positioning along the frame length (one-dimensional solution). By locating the lock rib at the end surface opposite to where the coupling receives driving force, the patent achieves reliable engagement without requiring a larger engagement area, thus avoiding increased device complexity.
Data Source
AI summary
A developing cartridge includes: a casing, a developing roller, a coupling, a coupling gear, a detection gear, an agitator, a first gear cover, a second gear cover, and a lock rib. The casing accommodates developing agent. The developing roller is rotatable about a first axis. The coupling and the coupling gear are rotatable about a second axis. The detection gear is rotatable about a third axis. The agitator agitates developing agent in the casing and performs power transmission from the coupling gear to the detection gear. The first gear cover covers at least the coupling gear. The second gear cover covers at least a portion of the detection gear. The lock rib is positioned at the other end of the casing. The lock rib is configured to be locked to a portion of a drum cartridge in a state where the developing cartridge is attached to the drum cartridge.