Rotating Member for Uniform Developer Distribution in Image Forming Apparatus
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Solution Overview
Problem
The existing developing devices in image forming apparatuses face issues with concentration differences of developers along the axial direction due to variations in developer supply, leading to uneven developer distribution and potential contamination or peeling of toner coatings, which can result in reduced image quality.
Innovation Solution
Incorporating a rotation member between the developer accumulating member and the developer carrier, which is rotated to facilitate even developer flow and prevent excessive stress on the developer, ensuring consistent developer distribution and maintaining high image quality by preventing peeling and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conveying member is used to supply developer to the developer carrier, then developer supply is achieved, but concentration difference occurs in the axial direction
Solution Approach 1:
The conveying member is divided into multiple conveying units arranged in the axial direction, with each unit responsible for supplying developer to a specific region of the developer carrier. This segmentation allows independent control of developer supply to different axial positions, eliminating concentration differences while maintaining overall supply efficiency.
2Quantity of substance
If developer accumulates in the accumulating portion, then developer storage is achieved, but excessive stress causes peeling and contamination
Solution Approach 1:
A rotation member is introduced as an intermediary component between the developer accumulating member and the developer carrier. This rotation member gently rotates to facilitate developer flow from the accumulating portion to the carrier, preventing excessive stress and mechanical damage that would cause peeling and contamination, while still enabling effective developer transfer.
3Device complexity
If no rotation member is provided, then device complexity is reduced, but concentration difference and developer stress increase
Solution Approach 1:
The rotation member introduces dynamic motion to the otherwise static developer transfer system. By rotating the rotation member, developer is gently agitated and guided from the accumulating portion to the carrier, creating uniform concentration distribution. This dynamic element prevents developer stagnation and excessive stress without requiring complex mechanical structures.
Data Source
AI summary
A developing device includes a developer carrier configured to carry a developer to be supplied to an image carrier on which an electrostatic latent image is to be formed, a conveying unit configured to convey the developer containing a toner and a carrier, a regulating member configured to regulate the developer carried by the developer carrier to a specified amount, a developer accumulating member disposed upstream of the regulating member in a rotation direction of the developer carrier, the developer accumulating member forming an accumulating portion in which the developer accumulates, and a rotation member disposed between the developer accumulating member and the developer carrier, the rotation member being rotated to allow the developer to pass through a space between the developer accumulating member and the rotation member.