Developing Device Restriction Member Axial Positioning
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Solution Overview
Problem
Existing developing devices with multiple rollers face issues with magnetic force interference, leading to conveyance and separation failures due to the close spacing and limited strength of the restriction member, which cannot effectively suppress these failures.
Innovation Solution
The design includes a developing device with a first and second developing roller, a collecting roller, and a restriction member where the second end portion of the restriction member is positioned to avoid magnetic force interference, allowing for effective conveyance and separation of developers without compromising the strength of the restriction member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the second end portion of the restriction member is positioned close to the developing rollers and collecting roller to save space, then the device complexity is reduced, but magnetic force interference is caused leading to conveyance and separation failures
Solution Approach 1:
The second end portion of the restriction member is extended in the axial direction of the rollers rather than being positioned close in the radial direction. This spatial reconfiguration in a different dimension eliminates magnetic force interference while maintaining compact overall device structure.
2Object-affected harmful factors
If the length of the restriction member is reduced to separate it from the developing rollers, then magnetic force interference is avoided, but the strength of the restriction member is sacrificed
Solution Approach 1:
Instead of reducing the length in the radial direction, the restriction member is extended in the axial direction. This dimensional change allows the second end portion to be positioned away from the rollers to avoid magnetic force interference while maintaining sufficient structural strength through increased length in a different orientation.
Solution Approach 2:
The restriction member is functionally segmented into a first end portion that contacts the developer and a second end portion that is positioned to avoid magnetic interference. This segmentation allows different parts of the same component to serve different functions and be positioned optimally for each function.
3Productivity
If the restriction member is made stronger to maintain conveyance control, then the conveyance amount of developer can be restricted effectively, but the device complexity increases
Solution Approach 1:
The restriction member is positioned in the axial direction away from the rollers, allowing it to be made stronger and more effective at controlling developer conveyance without increasing radial device complexity. The extended positioning in the axial dimension provides structural reinforcement without compromising device compactness.
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
This configuration reduces conveyance and separation failures by avoiding magnetic force interference and maintaining the strength of the restriction member, ensuring efficient developer conveyance and separation.
Implementation Method 1
a restriction member including a first end portion and a second end portion located on a side opposite to the first end portion, the first end portion being configured to restrict an amount of the developer on the second developing roller, and the second end portion being configured to generate a magnetic force
Implementation Method 2
a collecting roller facing the first developing roller in the developer housing, the collecting roller being configured to collect the developer on the first developing roller with a magnetic force
Implementation Method 3
the developing roller and the collecting roller absorb developer on the sleeve with the magnetic field generated among the plurality of conveyance poles to convey the developer
Data Source
AI summary
A developing device includes a first developing roller, a second developing roller, a first end portion configured to restrict the amount of developer on the second developing roller, a restriction member, and a collecting roller configured to collect developer on the first developing roller. The second end portion is located at a position where magnetic force interference with a magnetic force generated by the second developing roller and the collecting roller is not caused.