Drawer-Cartridge Electrode Alignment Using Recess-Protrusion Positioning
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Solution Overview
Problem
Existing image-forming apparatuses face challenges in achieving precise positional accuracy of cartridge electrodes relative to drawer electrodes, leading to potential misalignment and increased size due to interlocking mechanisms.
Innovation Solution
The apparatus incorporates a drawer frame with a recess and a cartridge side cover protrusion configuration that enhances the electrical connection accuracy by aligning the cartridge electrode with drawer electrodes, reducing the need for complex interlocking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a new electrical circuit is added passing through the main housing, drawer, and cartridges, then electrical connection functionality is improved, but the device complexity increases
Solution Approach 1:
The patent applies universality by making the existing electrical circuit serve multiple functions. The circuit that originally connected the main housing, drawer, and cartridges is configured to also detect the presence of the drawer and cartridges through electrical continuity testing. This allows a single circuit to perform both power/electrical connection and detection functions, avoiding the need for separate detection circuits and reducing overall device complexity.
2Manufacturing precision
If protrusion-recess interlocking mechanism is used to position cartridge electrode, then positional accuracy is improved, but device size increases
Solution Approach 1:
The patent applies segmentation by dividing the positioning function into separate elements: protrusions on the cartridge and corresponding recesses on the drawer frame. This modular approach allows precise electrode alignment through the protrusion-recess mechanism while keeping each individual component compact. The segmented design enables accurate positioning without requiring a large overall apparatus size, as the positioning features are integrated into the existing cartridge and drawer structures.
Data Source
AI summary
An image-forming apparatus includes: a main housing; a drawer movable in a first direction relative to the main housing; and a cartridge detachably attachable to the drawer. The drawer includes: a drawer frame; a first drawer electrode; and a second drawer electrode. The cartridge includes: a developing roller and a photosensitive drum each having a shaft extending in a second direction crossing the first direction; a side cover positioned at one end portion of the developing roller in the second direction; and a cartridge electrode positioned at the side cover and electrically connectable to the first and second drawer electrodes. The drawer frame has a first recess recessed in a third direction crossing both the first and second directions. The side cover has a first protrusion protruding in the third direction and configured to be received in the first recess.