Dual Magnet Roller Developer Stabilization
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Solution Overview
Problem
Existing developing devices for electrostatic latent images face instability in developer layer thickness due to disturbances caused by the magnetic field strengths becoming zero, leading to uneven developer transfer and image quality issues.
Innovation Solution
A developing device with a dual magnet roller system, where the first and second developer carriers have opposing magnetic poles arranged to maintain a stable developer chain height, preventing disturbances by ensuring the developer layer remains intact between specific magnetic field zero points, and the magnetic poles are positioned to facilitate smooth transfer and carrying of the developer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single developer carrier with magnetic poles is used, then the device structure is simple, but the developer layer thickness becomes unstable due to magnetic field disturbances
Solution Approach 1:
The single developer carrier is divided into two separate developer carriers (first and second), each with their own magnetic poles. This segmentation allows independent control of magnetic fields for transfer and carrying functions, preventing the instability caused by a single magnetic field system and enabling stable developer layer thickness control.
2Productivity
If magnetic field strength is increased to improve developer transfer, then transfer efficiency improves, but disturbances occur where magnetic field strengths become zero
Solution Approach 1:
The patent introduces an intermediary magnetic field control mechanism where the first and second developer carriers work together to create overlapping magnetic fields. This intermediary approach ensures continuous magnetic field coverage, eliminating zero-field disturbance points while maintaining efficient developer transfer.
3Quantity of substance
If the developer chain standing height is increased to improve developer supply, then developer availability improves, but the developer layer becomes unstable and disturbed
Solution Approach 1:
The patent optimizes the chain standing height parameter to a specific range that balances developer supply with stability. By controlling the magnetic field strength and carrier rotation speed, the system maintains the developer chain at an optimal height that ensures sufficient developer supply without causing layer instability or disturbances.
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 stabilizes the developer layer on both magnet rollers, preventing disturbances and ensuring consistent image development, thereby enhancing the quality and reliability of toner images formed on the photoconductor member.
Implementation Method 1
a first transfer magnetic pole that is disposed in an interior of the first developer carrier... the first transfer magnetic pole contributing to transfer of the developer from the first developer carrier to the second developer carrier
Implementation Method 2
a first downstream magnetic pole that is disposed in the interior of the first developer carrier... the first downstream magnetic pole causing the developer to be carried by the peripheral surface of the first developer carrier
Implementation Method 3
The developer that is carried by the peripheral surface of the first developer carrier and that moves while standing in the form of a chain from the peripheral surface of the first developer carrier by a magnetic field
Data Source
AI summary
A developing device includes a first developer carrier that carries developer on a peripheral surface thereof; a second developer carrier that carries the developer on a peripheral surface thereof; a supplying section that supplies the developer to the peripheral surface of the first developer carrier; a layer thickness regulating member that regulates a layer thickness of the developer supplied to the peripheral surface of the first developer carrier by the supplying section; a first transfer magnetic pole disposed in an interior of the first developer carrier; a second transfer magnetic pole disposed in an interior of the second developer carrier; a first downstream magnetic pole disposed in the interior of the first developer carrier; and a second downstream magnetic pole disposed in the interior of the second developer carrier.