Developing Device Toner Recycle Unit Filtration
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Solution Overview
Problem
Existing electrophotographic image forming apparatuses face inefficiencies in reusing toner due to agglomerative properties of recovered toner, leading to potential image quality degradation when toner of inappropriate size is directly recycled, necessitating filtration to ensure proper toner supply.
Innovation Solution
A developing device with a toner recycle unit that filters and re-supplies toner, detachably installed in the developing cartridge, which receives driving force from the cartridge without an additional unit, ensuring efficient toner recycling and maintenance simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If toner is recovered and directly recycled without filtration, then the recycling process is simple and fast, but image quality degrades due to agglomerative properties and inappropriate toner size
Solution Approach 1:
A filter member is introduced as an intermediary component between the toner recovery and recycling processes. The filter member selectively separates appropriate-toner from recovered toner based on size, allowing only properly sized toner particles to be recycled. This mediator resolves the contradiction by enabling quality control without significantly complicating the recycling workflow.
Solution Approach 2:
The filter member creates a local quality differentiation within the toner recycling system by separating toner particles based on their size properties. Appropriate-toner particles that meet size criteria are allowed to pass through for recycling, while unsuitable particles are separated out. This local quality control ensures that only high-quality toner is recycled, maintaining image quality standards.
2Adaptability or versatility
If a separate driving unit is added to operate the toner recycle unit, then the toner recycling function is enhanced, but the device complexity and manufacturing cost increase
Solution Approach 1:
The cleaning member is designed to perform multiple functions: it not only cleans residual toner from the photosensitive drum but also drives the toner recycle unit through its rotational motion. This multi-functionality eliminates the need for a separate driving unit, reducing device complexity while maintaining the toner recycling capability. The cleaning member's rotation naturally powers the toner recycle unit, integrating two functions into one component.
3Reliability
If a filter member is added to separate appropriate-toner, then image quality is maintained, but the device complexity increases
Solution Approach 1:
The filter member is merged with the cleaning member, allowing the cleaning member to serve dual purposes: cleaning the photosensitive drum and driving the toner recycling process through its rotation. This merging reduces the overall number of components and simplifies the device structure while maintaining the necessary filtration capability for image quality assurance.
Solution Approach 2:
The cleaning member's rotational motion automatically drives the toner recycle unit without requiring an external motor or separate driving mechanism. The system uses its own operational motion (cleaning rotation) to power the recycling function, eliminating the need for additional complex driving units while maintaining filtering capability.
Data Source
AI summary
An electrophotographic image forming apparatus is provided. The electrophotographic image forming apparatus includes a main body having an opening; a developing cartridge, detachably installed in the main body through the opening in a first direction, which includes a photosensitive drum and a cleaning member for removing a toner remaining in the photosensitive drum; and a toner recycle unit, detachably installed in the developing cartridge through the opening in the first direction, which recovers the toner removed by the cleaning member, filters the recovered toner, and supplies the toner again to the developing cartridge.