Stirring Member Positioning for Toner Circulation in Developing Apparatus
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Solution Overview
Problem
Conventional magnetic developer systems experience image defects due to inadequate developer circulation at the ends of the developing sleeve, leading to toner deterioration and inefficient transfer in contact developing systems.
Innovation Solution
A developing apparatus with a magnet roller and a sheet-shaped stirring member that extends beyond the magnet's magnetic field region, ensuring sufficient circulation of magnetic developer by positioning the stirring member's ends outside the magnetic field region generated by the magnet roller, allowing for effective toner distribution and prevention of interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the stirring member is designed to not reach the ends of the developer coating region to prevent interference, then interference between the stirring member and other members is avoided, but toner circulation defects occur at the ends of the developer coating region
Solution Approach 1:
The stirring member is designed with dynamic positioning capability, allowing it to be positioned at different locations depending on the operational phase. During the stirring phase, it extends to the ends of the developer coating region to ensure complete toner circulation. During the developing phase, it retracts or is positioned to avoid interference, thus resolving the contradiction between circulation effectiveness and interference prevention.
Solution Approach 2:
The stirring member is divided into multiple segments or sections, with different portions having different functions. The central portion performs the primary stirring action, while extended portions reach the ends of the developer coating region to eliminate circulation dead zones. This segmentation allows the stirring member to effectively cover the entire developer coating region without causing interference.
2Reliability
If the stirring member extends to the ends of the developer coating region to improve toner circulation, then toner circulation is enhanced, but interference with other members occurs
Solution Approach 1:
The stirring member incorporates dynamic adjustment mechanisms that allow it to extend to the full length of the developer coating region only when needed for stirring. During the developing operation, the stirring member can be retracted or repositioned to avoid interference with the developing sleeve and other components, thus maintaining reliable toner circulation while avoiding interference problems.
Solution Approach 2:
The stirring member is designed to operate in multiple dimensions or planes. It can extend radially to reach the ends of the developer coating region for effective stirring, while also having axial positioning capability to move in and out of the critical zone where interference with other members occurs. This multi-dimensional operation resolves the contradiction between circulation effectiveness and interference avoidance.
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 suppresses image defects by ensuring complete circulation of toner, preventing deterioration and excessive charging, thereby enhancing image quality and reducing waste toner in contact developing systems.
Implementation Method 1
a magnet roller disposed on an inner side of the developing sleeve
Implementation Method 2
the magnetic developer is maintained on the surface of the developing sleeve by the action of the magnetic force of the magnet included in the developing sleeve
Implementation Method 3
a stirring unit provided in the container frame and including a rotation shaft disposed in a direction along an axial direction of the developing sleeve, and a sheet-shaped stirring member attached to the rotation shaft to move with the rotation of the rotation shaft, the stirring unit stirring the magnetic developer in the container frame by the movement of the stirring member to move the magnetic developer toward the developing sleeve
Data Source
AI summary
In an axial direction of a developing sleeve that bears magnetic developer on an outer circumferential surface thereof, ends of a sheet-shaped stirring member that stirs the magnetic developer in a container frame to move the magnetic developer toward the developing sleeve are disposed on an outer side of a region in a magnetic field region generated by a magnet roller disposed on an inner side of the developing sleeve. The region has a magnetic field strength equal to or larger than a predetermined magnetic flux density at which the magnetic developer can be borne on the surface of the developing sleeve.