Magnetic Developer Thickness Regulator Sealing for Uniformity
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Solution Overview
Problem
Existing developing devices face challenges in uniformly regulating the thickness of the developer layer on the developer carrier, leading to potential nonuniformity in the resulting image due to issues with developer flow and particle flocculation, especially when using nonmagnetic developer-thickness-regulating members.
Innovation Solution
A developing device with a magnetic developer-thickness-regulating member and sealing members that prevent rotation and stabilize the regulating gap, ensuring consistent developer flow and thickness regulation, utilizing a magnetic developer-thickness-regulating member with a circular sectional shape and sealing members to maintain the gap size and prevent developer spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a nonmagnetic developer-thickness-regulating member is used, then the device structure is simpler, but the developer layer thickness cannot be uniformly regulated leading to image nonuniformity
Solution Approach 1:
The patent changes the material parameter of the developer-thickness-regulating member from nonmagnetic to magnetic material. This parameter change enables the member to interact with the magnetic carrier and developer particles, creating a magnetic field that uniformly regulates developer layer thickness while maintaining manufacturing feasibility.
Solution Approach 2:
The patent employs a magnetic developer-thickness-regulating member that combines magnetic properties with structural functionality. This composite approach integrates the magnetic field generation capability with the mechanical thickness regulation function, solving the uniformity issue while keeping the device structure relatively simple.
2Ease of operation
If the developer-thickness-regulating member allows rotation, then the sealing is easier, but the regulating gap becomes unstable causing developer flow issues
Solution Approach 1:
The patent applies sealing members at the ends of the developer-thickness-regulating member before operation to prevent rotation. This preliminary constraint ensures the regulating gap remains stable during the developing process, preventing developer flow issues while maintaining effective sealing.
Solution Approach 2:
The patent applies different contact pressures at different locations: higher contact pressure at the end sealing members to prevent rotation, and lower contact pressure in the middle section to avoid interfering with the regulating gap stability. This localized quality differentiation resolves both sealing and stability requirements.
3Reliability
If the contact pressure of sealing members is too high, then the sealing is better, but the regulating gap size changes affecting developer flow
Solution Approach 1:
The patent implements differential contact pressure through strategic placement: high contact pressure at the end sealing members for reliable sealing, and low contact pressure in the middle section to preserve regulating gap consistency. This local quality differentiation simultaneously achieves both sealing effectiveness and gap precision.
Solution Approach 2:
The patent segments the sealing function into two distinct zones: end sealing members for rotational constraint and leakage prevention, and middle section sealing for minimal interference with gap stability. This segmentation allows each zone to optimize its function without compromising the other.
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 magnetic developer-thickness-regulating member effectively stabilizes the developer layer thickness, preventing clogging and nonuniformity, while the sealing members ensure the developer flows only through the intended gap, enhancing image quality by maintaining a uniform developer layer.
Implementation Method 1
a developer-thickness-regulating member (47) that is a substantially long magnetic member having a substantially circular sectional shape
Data Source
AI summary
A developing device includes a developer-thickness-regulating member having a substantially circular sectional shape and that regulates a thickness of a developer layer on a developer carrier at a regulating gap between the developer carrier and the developer-thickness-regulating member, and sealing members that seal a gap between the developer-thickness-regulating member and a developing-device housing and include first sealing members provided at two ends of the developer-thickness-regulating member and on outer sides of an effective developer-transporting area, the first sealing members preventing rotation of the developer-thickness-regulating member by being in contact with the developer-thickness-regulating member at first portions excluding a portion opposite the regulating gap; and a second sealing member extending over the effective developer-transporting area and provided at a second portion excluding the portion opposite the regulating gap, the second sealing member being in contact with the developer-thickness-regulating member at a pressure lower than a pressure from the first sealing members.