Developing Device Magnet Brush Airflow Control
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Solution Overview
Problem
In developing devices using a two-component developer, excessive discharge of developer occurs due to airflow, leading to inefficient developer supply and potential blockages, especially when the regulation portion is defective, and increased speed exacerbates this issue.
Innovation Solution
A developing device with a developer container divided into two chambers, utilizing a first conveyance screw with blade portions to convey developer and a discharge path with a magnet positioned downstream of the discharge port to attract and accumulate developer, reducing airflow and excessive discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a regulation portion is provided to regulate airflow from the discharge port, then excessive discharge of developer is suppressed, but a small gap is generated in the path to the discharge port which allows air to flow out and causes excess discharge at higher speeds
Solution Approach 1:
A magnet is introduced as an intermediary substance in the discharge path. The magnet attracts and accumulates developer particles, forming a magnetic brush that physically blocks the discharge port. This intermediary mechanism prevents airflow through the discharge port without requiring complex mechanical regulation structures, thereby suppressing excessive developer discharge while maintaining a simple device structure.
Solution Approach 2:
The invention changes the physical state and distribution of developer particles by applying a magnetic field. The magnet alters the developer's position and density parameters by attracting particles to form a dense magnetic brush at the discharge port, transforming the developer from a free-flowing state to a controlled, accumulated state that effectively seals the discharge path.
2Productivity
If the speed of the developing device is increased to improve productivity, then output is enhanced, but air flows out through small gaps causing excess discharge of developer
Solution Approach 1:
The magnet serves as a speed-independent intermediary that maintains effective sealing of the discharge port regardless of device speed. While mechanical regulation portions fail at higher speeds due to centrifugal forces and timing issues, the magnetic field continuously holds developer particles in place, forming a dynamic seal that adapts to varying operational speeds without allowing excess developer discharge.
Solution Approach 2:
The invention replaces mechanical regulation mechanisms with a magnetic field-based system. Instead of relying on mechanical components that may have gaps or fail at high speeds, the magnetic field provides a non-contact, gap-free sealing mechanism that effectively prevents airflow and developer discharge across a wide range of operating speeds, thereby maintaining productivity without substance loss.
3Quantity of substance
If the discharge port is blocked to prevent excessive discharge, then developer level is maintained, but the path for developer to be discharged is obstructed
Solution Approach 1:
The magnet creates a localized accumulation of developer particles precisely at the discharge port, forming a magnetic brush with specific spatial distribution. This local quality change allows the developer to block the discharge port where needed while maintaining discharge capability through controlled mechanisms, thereby maintaining developer level without completely obstructing the discharge path.
Solution Approach 2:
The magnetic brush formed by the magnet is a dynamic structure that can adjust its position and density based on operational conditions. During normal operation, the magnetic brush maintains a balance that allows controlled discharge while preventing excessive loss. The system dynamically adapts to maintain both developer level and discharge functionality, rather than providing a static blockage.
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 effectively suppresses excessive developer discharge by blocking airflow and maintaining an appropriate developer level, ensuring consistent supply even at higher speeds.
Implementation Method 1
a magnet disposed downstream of an upstream end of the discharge port in the first direction so as to overlap with the discharge port in the first direction
Implementation Method 2
The magnet is disposed downstream of an upstream end of the discharge port in the first direction so as to overlap with the discharge port in the first direction
Data Source
AI summary
A developing device includes a first conveyance screw including a first blade portion and a second blade portion, the first blade portion configured to convey the developer in a first direction, the second blade portion being disposed downstream of the first blade portion in the first direction and configured to convey the developer in a second direction, a discharge path through which the developer passes to be discharged through a discharge port, and a magnet. The first conveyance screw includes a third blade portion disposed in the discharge path and configured to convey the developer in the first direction. The discharge port is disposed downstream of an upstream end of the third blade portion in the first direction. The magnet is disposed downstream of an upstream end of the discharge port in the first direction so as to overlap with the discharge port in the first direction.