Developer Retainer Gap Configuration for Toner Scattering
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Solution Overview
Problem
Existing image forming devices face challenges in suppressing toner scattering due to air pressure increases within the developing device, which affects the efficiency and quality of toner distribution and image formation.
Innovation Solution
The design incorporates a developer retainer with specific gap configurations between the developer carrier, image carrier, and container, along with an air circulation path, to manage air flow and prevent toner scattering by optimizing air suction and discharge, including the use of a brush to reduce toner concentration in air flows.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If air flow is increased to remove toner, then toner scattering is suppressed, but air pressure increase causes toner scattering
Solution Approach 1:
The developing device is divided into multiple sealed chambers (first developing chamber, second developing chamber, third developing chamber) separated by partition walls. Each chamber has independent air flow control with dedicated suction ports and discharge ports, allowing localized air pressure management without causing overall pressure increase that would scatter toner.
Solution Approach 2:
A brush member is introduced as an intermediary component in the air flow path. The brush member reduces toner concentration in the air flow by removing excess toner particles, thereby suppressing toner scattering while maintaining necessary air flow for developer circulation and heat dissipation.
2Reliability
If air suction is increased to maintain air flow, then toner scattering is suppressed, but developer distribution is affected
Solution Approach 1:
Different regions of the developing device have different air flow characteristics tailored to their specific functions. The first, second, and third developing chambers have optimized air suction and discharge arrangements that locally balance air flow rates to maintain appropriate developer distribution in each region while collectively suppressing toner scattering.
Solution Approach 2:
The air flow control system operates as a feedback mechanism where air is continuously circulated through the developing chambers, suctioned at controlled rates, and discharged through designated ports. This cyclic air flow maintains stable developer distribution while removing scattered toner, creating a self-regulating system that balances developer circulation with toner scattering suppression.
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 suppresses toner scattering, maintaining optimal air flow and toner distribution, thereby enhancing the quality and efficiency of the image forming process.
Implementation Method 1
a brush to reduce toner concentration in air flows
Implementation Method 2
an air circulation path, to manage air flow and prevent toner scattering by optimizing air suction and discharge
Data Source
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AI summary
An image forming system includes: an image carrier to rotate; a developer carrier to rotate; a container to contain the developer carrier; and a developer retainer separated from the rotatable developer carrier by a first gap of closest proximity, separated from the rotatable image carrier by a second gap of closest proximity, and separated from the container by a third gap of closest proximity. The first gap is smaller than the second gap and the third gap.