Developing Sleeve Grooves for Stable Upward Developer Feeding
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Solution Overview
Problem
In high-speed image forming processes, the delivery of developer between developing sleeves against the gravitational direction leads to drag phenomena, resulting in insufficient feeding capacity and fluctuations in developer weight ratio, causing image defects like color tint variations.
Innovation Solution
A developing device design featuring a first and second rotatable developing member with opposing rotational axes, where developer is delivered against gravity by a magnetic field, and both members have circumferentially arranged grooves to enhance feeding capacity and prevent drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If developer is delivered from first developing sleeve to second developing sleeve against gravitational direction, then delivery capability is improved, but developer drag occurs and feeding capacity becomes insufficient
Solution Approach 1:
The outer peripheral surface of each developing sleeve is divided into multiple grooves arranged in the circumferential direction. These grooves segment the developer into discrete units, preventing continuous drag and ensuring controlled delivery from the first developing sleeve to the second developing sleeve against gravitational direction.
2Productivity
If feeding capacity of developing sleeves is increased, then developer delivery is improved, but developer drag phenomenon occurs
Solution Approach 1:
The grooves on the developing sleeve surfaces segment the developer into discrete units, preventing continuous drag and ensuring controlled delivery.
Solution Approach 2:
The grooves are specifically positioned on the outer peripheral surfaces of the developing sleeves at locations where developer delivery occurs. This local modification enhances feeding capacity at critical points without affecting other regions, thereby increasing overall feeding capacity while preventing drag.
3Adaptability or versatility
If developer is delivered against gravitational direction, then delivery flexibility is improved, but developer weight ratio becomes unstable
Solution Approach 1:
The grooves segment the developer into discrete units that maintain stable weight ratio during delivery against gravitational direction. This segmentation prevents excessive developer accumulation and ensures consistent weight distribution from the first to the second developing sleeve.
Solution Approach 2:
The groove structure changes the physical parameters of developer delivery by creating discrete, controlled units. This modification stabilizes the developer weight ratio while maintaining the flexibility of delivering against gravitational direction.
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 design suppresses developer drag and maintains stable developer feeding, ensuring consistent image quality by preventing developer drop-off and maintaining the developer weight ratio, thus reducing image defects.
Implementation Method 1
the developer is delivered from the first rotatable developing member to the second rotatable developing member against a gravitational direction by a magnetic field generated between the first magnet and the second magnet
Data Source
AI summary
A developing device includes a developing container, first and second rotatable developing members, a first magnet provided inside the first rotatable developing member, and a second magnet provided inside the second rotatable developing member. A rotational axis of the second rotatable developing member is positioned above a rotational axis of the first rotatable developing member. The developer is delivered from the first rotatable developing member to the second rotatable developing member against a gravitational direction by a magnetic field generated between the first magnet and the second magnet. On an outer peripheral surface of the first rotatable developing member, a plurality of first grooves are formed along a circumferential direction of the first rotatable developing member. On an outer peripheral surface of the second rotatable developing member, a plurality of second groves are formed along a circumferential direction of the second rotatable developing member.