Developing Apparatus Axial Toner Uniformity Segmentation
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Solution Overview
Problem
Existing image forming apparatuses using electrophotographic technology face challenges in maintaining uniform toner concentration along the axial direction of developing apparatuses, leading to deviations in developer state and increased recovery time, especially when handling large sheets.
Innovation Solution
A developing apparatus with a developer carrying member, multiple developer feeders arranged in the axial direction, and a collecting part that redistributes developers between feeders to ensure uniform distribution, reducing toner concentration differences and improving developer uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the developing apparatus size is increased to handle long sheets, then the processing capability is improved, but the toner concentration deviation in the axial direction increases
Solution Approach 1:
The developing apparatus is divided into multiple axial regions (first region and second region) with separate stirring members for each region. This segmentation allows independent control of developer circulation in each region, preventing toner concentration deviation that would occur in a single large-region system.
Solution Approach 2:
Different stirring members are configured with opposite wing directions tailored to each specific axial region's characteristics. The first stirring member has wings configured for the first region while the second stirring member has wings configured for the second region, optimizing local developer circulation patterns.
2Manufacturing precision
If the developing apparatus is divided into multiple regions with separate stirring, then the toner concentration uniformity is improved, but the developer state uniformity across regions deteriorates
Solution Approach 1:
The developer circulation systems of the first and second regions are merged through a shared developer supply path. Developer is supplied from a common supply chamber to both regions, ensuring that both regions receive developer from the same source and maintain consistent developer state despite separate stirring operations.
Solution Approach 2:
The developer supply chamber serves multiple functions: it acts as the common source for both first and second regions, and also functions as a mixing chamber where developer is prepared before distribution. This multi-functionality ensures uniform developer state across regions.
3Manufacturing precision
If active developer circulation is implemented in both regions, then the toner concentration distribution is improved, but the recovery time increases when toner concentration drops
Solution Approach 1:
The developer circulation systems are merged through a shared supply path, allowing the entire developer population to function as a unified reservoir. When toner concentration drops in one region, the shared supply system enables rapid replenishment from the combined developer pool, reducing recovery time.
Solution Approach 2:
Both stirring members operate continuously to maintain active developer circulation in both regions simultaneously. This continuous action ensures that toner concentration is maintained without interruption and enables rapid response when concentration drops, minimizing recovery time.
Data Source
AI summary
A developing apparatus includes: a developer carrying member carrying a developer; a plurality of developer feeders accommodating the developer carried by the developer carrying member and being arranged in an axial direction of the developer carrying member; and a collecting part that collects the developer from the developer carrying member and feeds the developer to a second developer feeder different from a first developer feeder located at a position where the developer is collected from the developer carrying member in the axial direction, among the plurality of developer feeders.