Developer Layer Regulating Member Spot Weld Gaps
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Solution Overview
Problem
The existing developer layer regulating members in image forming apparatuses face issues with residual processing oil remaining on magnetic and non-magnetic materials, leading to uneven developer distribution and image defects like white streaks due to poor air passage and capillary phenomena.
Innovation Solution
A developer layer regulating member with a magnetic material and a non-magnetic material bonded by two rows of spot welds, where the second spot weld row extends between the first and the rear end of the magnetic material, improves the gap distribution, preventing residual oil from adhering to the developer and ensuring consistent developer conveyance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single row of spot welds is used to bond magnetic and non-magnetic materials, then the structure is simple and manufacturing is easy, but residual processing oil remains trapped causing uneven developer distribution and image defects
Solution Approach 1:
The single row of spot welds is segmented into two separate rows (first spot weld row and second spot weld row) positioned at different locations between the magnetic and non-magnetic materials. This segmentation creates multiple gaps that improve air passage and prevent residual oil trapping, thereby achieving uniform developer distribution without excessive complexity
Solution Approach 2:
The solution transitions from a one-dimensional single row of spot welds to a two-dimensional arrangement with two rows of spot welds. This dimensional change creates additional spacing and air passages in the structure, allowing trapped processing oil to be eliminated while maintaining manufacturing feasibility
2Strength
If magnetic and non-magnetic materials are bonded closely together, then structural strength is improved, but air passage is blocked causing capillary phenomena and residual oil adhesion
Solution Approach 1:
The bonding structure is segmented into two separate rows of spot welds rather than one continuous row. This creates multiple discrete bonding zones with gaps between them, allowing air to pass through and preventing capillary action that would cause residual oil to adhere to the developer
Solution Approach 2:
The gaps between the two rows of spot welds act as intermediary air passages that mediate between the magnetic and non-magnetic materials. These gaps allow air flow that prevents the direct contact and capillary phenomena that would occur with close bonding, while the spot welds themselves maintain the necessary structural strength
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 prevents residual oil from sticking to the doctor blade, maintaining consistent developer distribution and reducing image defects, ensuring uniform image formation.
Implementation Method 1
a first spot weld row that bonds the magnetic material to the non-magnetic material, and a second spot weld row that bonds the magnetic material to the non-magnetic material
Implementation Method 2
The developing device includes a developing roller that carries the developer and supplies the developer to the photoreceptor and a developer layer regulating member that regulates a thickness of a layer of the developer carried on the developing roller
Data Source
AI summary
According to one embodiment, there is provided a developer layer regulating member including: a magnetic material extending in an axis direction of a developing roller; a non-magnetic material facing the magnetic material; and first and second spot weld rows that bond the magnetic material to the non-magnetic material. The magnetic material includes a first end located near the developing roller and a second end located on an opposite side of the first end. The first spot weld row extends in the axis direction of the developing roller between the first and second ends of the magnetic material. The second spot weld row extends in the axis direction of the developing roller between the first spot weld row and the second end of the magnetic material.