Developer Replenishment Layout for Stable Toner Concentration
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Solution Overview
Problem
In developing devices using a two-component developer, the magnetic carrier deteriorates due to mechanical stress, leading to degraded charging performance as it is stirred with toner, and existing solutions fail to effectively manage the distribution and discharge of fresh developer.
Innovation Solution
A developing device with a development container featuring separate conveyance chambers, a developer replenishment port, and a discharge port, along with conveyance members and blades, ensures uniform distribution and controlled discharge of developer, maintaining developer quality and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the magnetic carrier is stirred with toner inside the development container during development operations, then the toner is supplied to the image carrier, but the magnetic carrier deteriorates due to mechanical stress and charging performance degrades
Solution Approach 1:
The patent implements a developer replenishment system that discharges worn magnetic carriers from the development container and replenishes them with fresh developer containing new magnetic carriers and toner. This discards the deteriorated magnetic carriers that have lost charging performance and recovers the developing function by introducing fresh components, thereby resolving the contradiction between continuous toner supply and magnetic carrier deterioration.
2Reliability
If fresh developer is replenished in the development container, then the magnetic carrier charging performance is restored, but excess developer must be discharged which complicates the system structure
Solution Approach 1:
The patent merges the replenishment and discharge operations into a unified system. The replenishment blade and discharge mechanism are integrated such that fresh developer is introduced and excess developer is discharged through a coordinated action, reducing the number of separate components and simplifying the overall system structure while maintaining the ability to restore magnetic carrier charging performance.
Solution Approach 2:
The development container is designed with multi-functionality, serving both as the developing chamber and as the receptacle for replenishment and discharge operations. The same container that holds the developer during development also accommodates the replenishment blade and discharge mechanism, eliminating the need for separate dedicated structures and reducing system complexity.
3Stability of the object's composition
If the developer replenishment port is positioned to allow developer to fall into both conveyance chambers, then uniform toner concentration is achieved, but the port structure becomes more complex
Solution Approach 1:
The replenishment port is segmented into multiple opening portions that are strategically positioned to allow fresh developer to fall into both the first and second conveyance chambers. This segmentation of the port structure enables uniform distribution of developer across different chambers without requiring a complex overall port design, achieving toner concentration uniformity while maintaining structural simplicity.
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 enhances developer dispersing and discharging performance, preventing uneven toner concentration and maintaining charging performance by effectively integrating fresh developer into the system while managing excess discharge.
Implementation Method 1
a first conveyance blade formed on an outer circumferential surface of the first rotation shaft, and conveys, while stirring, the developer in the first conveyance chamber in a first direction
Implementation Method 2
a second conveyance blade formed on an outer circumferential surface of the second rotation shaft, and conveys, while stirring, the developer in the second conveyance chamber in a second direction that is opposite to the first direction
Implementation Method 3
The regulation blade is formed downstream of the second conveyance blade with respect to the second direction, and conveys the developer in a direction opposite to the second conveyance blade
Implementation Method 4
The discharge blade is formed downstream of the regulation blade with respect to the second direction, and conveys the developer in a same direction as the second conveyance blade to discharge the developer through the developer discharge port
Data Source
AI summary
A developing device includes a development container, a first conveyance member, a second conveyance member, and a developer carrier. The second conveyance member includes a regulation blade that is formed downstream of a second conveyance blade with respect to a second direction which is a conveyance direction of the developer, and that conveys the developer in a direction opposite to the second conveyance blade. A developer replenishment port is formed in an upper surface of the development container, and at least part of an opening length thereof in the second direction is included in a regulation area which is an area inside a second conveyance chamber where the regulation blade is disposed. At least part of the developer replenished through the developer replenishment port falls into both a first conveyance chamber and the regulation area.