Pivotal Toner Cartridge for Independent Drum Replacement
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Solution Overview
Problem
Conventional image forming apparatuses require replacing the entire process cartridge, including the photosensitive drum, when the toner residual amount becomes low, leading to unnecessary costs and resource wastage.
Innovation Solution
The image forming apparatus is designed with a main body housing, a drum cartridge containing a photosensitive drum, and a toner cartridge. The drum cartridge is movable between two positions, allowing the toner cartridge to be decoupled and removed independently when the drum cartridge is at the second position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire process cartridge is replaced when toner residual amount becomes low, then the image forming apparatus can continue operation, but unnecessary costs are incurred and resources are wasted due to replacement of the photosensitive drum which does not need replacement
Solution Approach 1:
The process cartridge is divided into two separate replaceable units: a drum cartridge containing the photosensitive drum and a toner cartridge containing the toner. This segmentation allows independent replacement of each component based on its actual condition, enabling the photosensitive drum to be reused until failure while only replacing the toner cartridge when toner is depleted, thereby eliminating waste of the photosensitive drum.
Solution Approach 2:
The invention changes the replacement criterion from a fixed condition (low toner level) requiring complete cartridge replacement to a component-specific condition where only the toner cartridge is replaced. This parameter change in the replacement strategy allows the photosensitive drum to continue operation beyond the toner depletion point, reducing unnecessary resource waste.
2Device complexity
If the toner cartridge and drum cartridge are integrated in a single process cartridge, then the structure is simplified, but the complexity of replacement increases because the entire cartridge must be replaced even when only toner is depleted
Solution Approach 1:
The integrated process cartridge is segmented into separate drum cartridge and toner cartridge units. Each unit has its own guide structure (drum cartridge guide and toner cartridge guide) that enables independent installation and removal. This segmentation simplifies the replacement operation by allowing users to replace only the toner cartridge when needed, rather than handling the entire integrated cartridge.
Solution Approach 2:
The invention introduces dynamic positioning capabilities where the drum cartridge can move between a first position (when toner cartridge is attached) and a second position (when toner cartridge is removed). Similarly, the toner cartridge can pivot between a first pivot position (coupled state) and a second pivot position (decoupled state). This dynamic design facilitates easy separation and independent replacement of components.
Data Source
AI summary
An image forming apparatus includes a main body housing, a drum cartridge, and a toner cartridge. The drum cartridge is movable inside the main body housing between a drum first position and a drum second position. The toner cartridge is movable between a toner first position and a toner second position in a state where the toner cartridge is coupled to the drum cartridge. In a state where the toner cartridge is coupled to the drum cartridge, the drum cartridge is at the drum second position, and the toner cartridge is at the toner second position, the toner cartridge is pivotally movable relative to the drum cartridge between a first pivot position at which coupling of the toner cartridge to the drum cartridge is not releasable and a second pivot position at which the coupling of the toner cartridge to the drum cartridge is releasable.