Elastic Developing Blade with Restricting Member for Uniform Toner Layer
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Solution Overview
Problem
Conventional developing blades result in uneven toner adhesion along the axis of the developing roller, leading to concentration unevenness in printed images due to inconsistent toner quantity and pressure distribution.
Innovation Solution
A developing unit with a developer layer forming member made from an elastic plate-shaped member, featuring a bending piece that restricts fluidity by incorporating a restricting member to maintain uniform pressure and toner layer thickness, ensuring consistent toner adhesion and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional developing blade with L-shaped bending tip is used to shave surplus toner, then the toner layer is formed on the developing roller, but the toner adheres unevenly along the axis direction causing concentration unevenness in printed images
Solution Approach 1:
The patent applies local quality by creating a restricting member with varying properties along its length. The restricting member has a first portion with different characteristics than a second portion, allowing different regions to perform different functions: one region restricts toner fluidity while another allows uniform adhesion, thereby solving the uneven toner distribution problem
Solution Approach 2:
The developing blade is segmented into functional portions: a conventional L-shaped bending tip for toner shaving and an additional restricting member with first and second portions. This segmentation allows each portion to perform its specific function independently, with the restricting member's first portion controlling toner fluidity and the second portion maintaining uniform pressure distribution
2Quantity of substance
If the developing blade presses the outside plane of the bending tip to the developing roller, then the toner quantity is restricted, but the pressure distribution becomes inconsistent leading to uneven toner layer thickness
Solution Approach 1:
The restricting member introduces local quality variations along the blade structure. The first portion is designed to restrict toner fluidity while the second portion maintains uniform pressure distribution, ensuring consistent toner layer thickness across the developing roller surface
3Productivity
If the toner fluidity is unrestricted at the upstream side, then the toner can move freely to the contact part, but the toner quantity becomes inconsistent causing vertical concentration unevenness in prints
Solution Approach 1:
The patent changes the fluidity parameter of toner by introducing the restricting member. The first portion of the restricting member specifically restricts toner fluidity at the upstream side, controlling the rate and uniformity of toner movement to the contact part, thereby ensuring consistent toner quantity distribution
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves a stable and uniform toner layer on the developing roller, preventing concentration unevenness in printed images and enhancing image quality by maintaining consistent toner adhesion and pressure distribution.
Implementation Method 1
the developer layer forming member is made from an elastic member with plate shape, and has bending piece by bending the elastic member nearby the contact part toward outside of a radial direction of the developing member
Implementation Method 2
a restricting member to restrict fluidity of the developer at a upstream side in a rotating direction of the developing member in front of a contact part of the developer layer forming member and the developing member
Data Source
AI summary
A developing unit is provided, which includes a developer accommodating section to accommodate developer; a developing member to provide the developer accommodated in the developer accommodating section to an image carrying body by rotating; a developer layer forming member to forming a developer layer by shaving the developer on surface of the developing member; and a restricting member to restrict fluidity of the developer at a upstream side in a rotating direction of the developing member in front of a contact part of the developer layer forming member and the developing member.