Developing Device Reverse Transport Blade Magnetic Attraction
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Solution Overview
Problem
Conventional developing devices face challenges in maintaining a constant developer amount due to variations in toner concentration and fluidity, leading to issues such as decreased developing amounts, auger marks, and potential leakage, which existing technologies like trickle development systems struggle to address effectively.
Innovation Solution
Incorporating a developer discharge unit with a reverse transport blade and magnetic attraction unit within a reversing passage, which adjusts the developer discharge based on toner concentration, ensuring consistent developer levels by magnetically attracting the developer in the reverse transport blade or reversing passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a magnetic attraction unit is provided in a conventional developer discharge unit, then the developer amount can be controlled, but the variation in developer amount due to toner concentration changes cannot be suppressed
Solution Approach 1:
The reverse transport blade is configured to rotate around a rotation shaft, enabling dynamic adjustment of developer discharge based on toner concentration variations. This rotational mechanism allows the system to adaptively control the amount of developer discharged, maintaining stable developer levels despite changes in toner concentration and fluidity.
Solution Approach 2:
The magnetic attraction unit acts as an intermediary between the developer and the reverse transport blade, selectively attracting and retaining developer particles. This intermediary mechanism enables precise control over developer discharge by using magnetic forces to regulate the flow of developer from the developing device.
2Device complexity
If the developer discharge unit operates without adjustment, then the structure remains simple, but issues like auger marks and leakage occur due to toner concentration variations
Solution Approach 1:
The system changes operational parameters by adjusting the rotation of the reverse transport blade and the magnetic attraction force based on toner concentration. This parameter adjustment allows the simple structural components to achieve sophisticated control, preventing auger marks and leakage without complicating the overall device structure.
Solution Approach 2:
The reverse transport blade with magnetic attraction unit automatically adjusts developer discharge based on the actual toner concentration and fluidity conditions. The system self-regulates to maintain optimal developer levels, preventing harmful effects like auger marks and leakage through autonomous control rather than requiring complex external intervention mechanisms.
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 stabilizes the developer amount within the developing device, preventing issues like auger marks and leakage by adjusting discharge according to toner concentration, maintaining optimal developing characteristics.
Implementation Method 1
a magnetic attraction unit magnetically attracting the developer in at least one of the reverse transport blade or the reversing passage
Data Source
AI summary
A developing device includes: a developer transport unit that transports a developer containing a toner and a carrier; and a developer discharge unit provided at an end portion on a downstream side along a transport direction of the developer transport unit and including a reverse transport blade that is disposed inside a reversing passage from which a part of the developer is discharged, and rotates around a rotation shaft to transport the developer in a direction opposite to a discharge direction, the developer discharge unit including a magnetic attraction unit magnetically attracting the developer in at least one of the reverse transport blade or the reversing passage.