Developing Roller Separation Pole Positioning for Toner Adherence
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Solution Overview
Problem
In electronic image forming apparatuses, such as printers and copy machines, the used developer often adheres to the catching pole of the developing roller due to low toner content, leading to deteriorated image quality, and existing solutions require high accuracy in assembly and additional components.
Innovation Solution
The developing device incorporates a developing roller with multiple magnets, including a catching pole, a regulating pole, and a separation pole, where the tangential line of the separation pole is positioned outward from the mixer's outer circumference, preventing the developer from being drawn back to the catching pole, thus maintaining the developer's toner concentration before it falls to the mixer for stirring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a control plate is provided to prevent the collected used developer from being drawn to the catching pole, then the adherence of used developer to the catching pole is prevented, but the assembly requires high accuracy in spacing and increases the number of components and assembly processes
Solution Approach 1:
The invention extracts the harmful magnetic field effect from the separation pole by repositioning it outward from the mixer's outer circumference. This removes the source of the problem (used developer being drawn back to the catching pole) without adding control plates or other preventive components, thereby reducing device complexity while maintaining reliability
Solution Approach 2:
The invention changes the spatial arrangement by moving the separation pole from an internal position to an external position relative to the mixer's outer circumference. This dimensional repositioning in the radial direction eliminates the harmful effect on the catching pole while avoiding the need for additional control components
2Reliability
If the separation pole is repositioned outward from the mixer's outer circumference, then the used developer is prevented from being drawn back to the catching pole, but the magnetic field distribution and pole positioning become more critical
Solution Approach 1:
The invention performs the separation action at an earlier stage by positioning the separation pole outward from the mixer, preventing used developer from ever reaching the catching pole area. This preliminary separation action ensures consistent developer quality without requiring high precision in the catching pole region
Solution Approach 2:
The outward repositioned separation pole acts as an intermediary that intercepts and separates used developer before it can affect the catching pole. This mediator position reduces the sensitivity to positioning precision by creating a buffer zone that prevents harmful interactions
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 effectively prevents the used developer from adhering to the catching pole, ensuring consistent toner supply to the photoconductive drum and improving image quality without the need for complex assembly or additional components.
Implementation Method 1
The developing roller has plural magnets within a rotating outer roller. The developing roller catches the developer using catching pole, which is one of the plural magnets, then supplies the developer to the photoconductive drum using another magnet, and separates the used developer from the outer roller using another magnet.
Implementation Method 2
a mixer which stirs a carrier and a toner and supplies the developing roller with the developer acquired by this stirring
Data Source
AI summary
An image forming apparatus includes: a photoconductive drum; a mixer which stirs a developer; and a developing roller which has plural magnets to supply the stirred developer to the photoconductive drum, and a separation pole that is a magnet arranged opposite the photoconductive drum in relation to a rotational center axis and separating the developer supplied to the photoconductive drum, and which is arranged in a way that a vertical first tangential line on the separation pole side is located outward to the separation pole side from an outer circumference of the mixer.