Developer Guide Member for Uniform Toner Distribution
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Solution Overview
Problem
Conventional image forming apparatuses face issues with toner distribution, leading to uneven image darkness across the width of printed sheets due to the centralized toner supply opening, resulting in poor image quality.
Innovation Solution
A developing device with a developer guide member and delivery member that ensures uniform toner distribution along the longitudinal direction, using a developer container with a supply opening and storage section, and a toner guide with a U-shaped wall portion to direct toner flow uniformly across the width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the toner supply opening is formed at a center portion of the developing device main body, then toner can be supplied through a single opening, but the toner distribution becomes uneven causing difference in darkness in the width direction of the image
Solution Approach 1:
The invention divides the single center toner supply opening into multiple supply openings (first and second toner supply openings) positioned at different locations (center and side portions) of the developing device main body. This segmentation allows toner to be supplied from multiple points simultaneously, achieving uniform toner distribution across the width direction and eliminating the darkness difference in the formed image.
2Object-generated harmful factors
If the toner supply opening is made small and centered, then toner sticking area is reduced when cartridge is removed, but toner delivery uniformity deteriorates
Solution Approach 1:
The invention segments the toner supply function across multiple openings (center and side portions) rather than using a single small center opening. This allows each opening to be optimally sized for its location while collectively achieving uniform toner distribution, and the multiple openings are positioned to minimize toner dropping issues during cartridge removal.
Solution Approach 2:
The invention applies different opening positions (center and side portions) to address different local requirements: the center opening handles primary toner supply while side openings ensure uniform distribution at the edges. Each opening's location is optimized for its specific function in achieving overall uniform toner delivery.
3Device complexity
If a single center toner supply opening is used, then the structure is simple, but the toner flows unevenly causing poor image quality
Solution Approach 1:
The invention segments the toner supply system into multiple openings positioned at the center and side portions of the developing device main body. This segmentation ensures that toner flows uniformly across the width direction, eliminating the darkness difference in the formed image and significantly improving image quality consistency while maintaining reasonable structural complexity.
Data Source
AI summary
A developing device includes a developer container having a developer supply opening and a developer storage section, so that developer is supplied from the developer container to the developer storage section through the developer supply opening. The developing device further includes a developer guide member disposed below the developer supply opening along a longitudinal direction of the developing device, and a developer delivery member disposed in the developer guide member for delivering developer supplied through the developer supply opening in a longitudinal direction of the developer guide member. The developer guide member has a wall portion having a shape so that developer flows out the developer guide member in a substantially uniform amount along the longitudinal direction of the developing device.