Developing Device Toner Leakage Prevention
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Solution Overview
Problem
Increasing the toner supply speed in electrophotographic image forming apparatuses leads to toner leakage between the developing roller and the layer thickness regulation blade, causing inefficiencies and waste.
Innovation Solution
A developing device with a partitioned structure that includes a developer accommodation chamber, a supply chamber, a return chamber, and a partition wall, featuring a developer conveying unit and a returning unit to manage toner distribution and prevent leakage by orthogonal conveyance of toner back to the accommodation chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the toner supply speed is increased to enhance printing performance, then the productivity is improved, but the toner may leak through between the layer thickness regulation blade and the developing roller
Solution Approach 1:
The developing frame is segmented into multiple functional chambers: a developer accommodation chamber, a developer supply chamber, and a developer return chamber. This segmentation isolates the toner supply path from the developing roller area, preventing leakage while maintaining high supply speed. The partition wall separates these chambers to control toner flow directionally.
Solution Approach 2:
A developer conveying unit is introduced as an intermediary mechanism between the developer supply chamber and the developing roller. This unit controls the toner supply process, ensuring that toner is delivered at high speed without causing leakage. The conveying unit acts as a mediator that manages the transition of toner from the supply chamber to the developing roller while preventing uncontrolled flow.
2Productivity
If the toner supply speed is increased from the supply roller to the developing roller, then the productivity is improved, but a large amount of toner stays in the vicinity of the developing roller causing leakage
Solution Approach 1:
The developing frame is divided into distinct chambers: a developer supply chamber for storing and supplying toner, and a developer return chamber for collecting excess toner. This segmentation prevents toner accumulation near the developing roller by providing dedicated zones for toner management, allowing high supply speed without overflow.
Solution Approach 2:
The developer return chamber is designed to recover and return excess toner that is scraped off from the developing roller by the layer thickness regulation blade. This recovery mechanism prevents toner waste and maintains a balanced toner quantity in the system, enabling continuous high-speed operation without accumulation.
3Productivity
If the toner supply speed is increased, then the productivity is improved, but the layer thickness regulation may be compromised due to toner leakage
Solution Approach 1:
The partition wall separates the developer supply chamber from the developing roller area, creating a controlled environment for layer thickness regulation. This segmentation ensures that toner supply dynamics do not interfere with the precision of the layer thickness regulation blade, maintaining uniform layer thickness even at high supply speeds.
Solution Approach 2:
The developer conveying unit serves as an intermediary that delivers toner to the supply roller in a controlled manner. This mediator ensures stable toner supply to the developing roller, preventing fluctuations that could affect layer thickness uniformity, thereby maintaining manufacturing precision during high-speed operation.
Data Source
AI summary
A developing device includes: a developing frame having an opening; a developing roller that is arranged to the opening and is configured to carry developer; a supply roller configured to supply the developer to the developing roller, and a layer thickness regulation member configured to regulate a layer thickness of the developer carried on the developing roller. The developing frame includes: a developer accommodation chamber configured to accommodate the developer; a developer supply chamber configured to supply the developer, which is supplied from the developer accommodation chamber, to the supply roller; a developer return chamber that is arranged above the developer supply chamber and is configured to return the developer, which is scraped off by the layer thickness regulation member, to the developer accommodation chamber. The developer return chamber is provided with a developer returning unit configured to convey the developer to the developer accommodation chamber.