Developer Roller Layer Thickness Regulating Member
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Solution Overview
Problem
Mechanical stress on the developer in electrophotographic image forming apparatuses leads to deterioration of toner and carrier, affecting the uniformity and longevity of the developer, and results in reduced image quality and shortened device life.
Innovation Solution
A developing device with a layer thickness regulating member comprising multiple blades and a guide element that directs excess developer back to the stir-and-transport member, reducing pressure on the developer and preventing lodging, thereby maintaining uniform developer thickness and extending device life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional layer thickness regulating member is used to remove excess developer, then the developer layer thickness is controlled, but mechanical stress on the developer increases causing toner and carrier deterioration
Solution Approach 1:
The layer thickness regulating member is divided into multiple blades (first blade, second blade, third blade) arranged at different positions. Each blade removes excess developer at a different location, distributing the mechanical stress across multiple contact points rather than concentrating it at a single location, thereby reducing overall stress on the developer particles
Solution Approach 2:
The guide element acts as an intermediary component that redirects excess developer from the second blade back to the stir-and-transport member. This mediator function prevents excess developer from accumulating in high-stress zones and returns it to a low-stress zone for remixing, reducing cumulative mechanical stress on the developer
2Manufacturing precision
If excess developer is removed by conventional means, then layer thickness is regulated, but excess developer lodges and accumulates in the regulating member
Solution Approach 1:
The guide element creates a feedback loop that redirects excess developer removed by the second blade back to the stir-and-transport member. This feedback mechanism ensures that excess developer does not accumulate in the layer thickness regulating member but is continuously circulated and remixing, preventing lodging and accumulation
Solution Approach 2:
Instead of discarding excess developer at a single location where it would accumulate, the system recovers the excess developer by redirecting it back to the stir-and-transport member through the guide element, allowing it to be reused in the developing process
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 reduces mechanical stress on the developer, maintaining high-speed printing capabilities, low-temperature fixing, and extending the life of the image forming apparatus by ensuring uniform developer thickness and preventing accumulation, thus enhancing image quality and device longevity.
Implementation Method 1
The transported developer is magnetically transferred onto a developer roller that is rotated
Implementation Method 2
pressure acting on the developer can be reduced, the lodging and/or accumulating (or dwelling/cumulating) of the excess developer in the layer thickness regulating member can be prevented
Data Source
AI summary
A developing device includes a developer roller, a stir-and-transport member, and a layer thickness regulating member. The developer roller may carry developer to a photosensitive body. The stir-and-transport member may supply the developer to the developer roller. The layer thickness regulating member is located adjacent the developer roller to remove excess developer. The layer thickness regulating member includes a guide element to direct the excess developer to the stir-and-transport member.