Restricting Member Contact Geometry for Uniform Toner Layers
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Solution Overview
Problem
Existing image forming apparatuses face inefficiencies in toner layer thickness control due to the use of developing blades that require cutting, leading to reduced raw material efficiency and non-uniform toner layer distribution, which can result in toner scattering and dripping.
Innovation Solution
A developing device with a restricting member featuring a blade portion and a supporting portion, where the contact portion at the free end is designed with varying scraping amounts in the transverse and thickness directions to maintain uniformity and reduce material waste, ensuring stable toner supply and prevention of layer thickness accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a developing blade is cut to form a cutout in the free end, then the toner layer thickness uniformity is improved, but the raw material efficiency is reduced due to discarded cut pieces
Solution Approach 1:
The contact portion of the developing blade is designed with non-uniform thickness, featuring a first portion with greater thickness and a second portion with lesser thickness. This local variation in quality allows different regions of the blade to perform different functions: the thicker first portion provides structural support and consistent toner scraping in the central region, while the thinner second portion reduces material usage at the ends without compromising overall performance.
Solution Approach 2:
The contact portion is divided into distinct segments: a first portion extending in the longitudinal direction and a second portion extending in the thickness direction. This segmentation allows each portion to be optimized independently for its specific function, eliminating the need for cutting and discarding material to create functional zones.
2Ease of manufacture
If the developing blade has uniform thickness, then the manufacturing is simplified, but the toner layer thickness uniformity in the longitudinal direction deteriorates
Solution Approach 1:
Rather than making the entire blade uniform or complex, only the contact portion is designed with varying thickness while the rest of the blade maintains simple geometry. This localized complexity achieves the desired toner layer uniformity without significantly complicating the overall manufacturing process.
Data Source
AI summary
A restricting member includes a blade portion and a supporting portion. A contact portion is provided at the blade portion, and, in a cross section orthogonal to a longitudinal direction, the contact portion includes a first portion extending in a first direction and a second portion extending toward a free end from an end of the first portion and extending in a second direction. When a region demarcated by connecting an intersection point, the end of the first portion, and an end of the second portion by a straight line is defined as a first region, the intersection point being where an imaginary line intersects an extension line of the first portion in the first direction, an area of the first region is smaller on a longitudinal end portion than on a longitudinal central portion of the blade portion.