Pneumatic Toner Replenishment for Multi-Unit Image Formation
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Solution Overview
Problem
Existing electrophotographic image forming apparatuses face challenges in efficiently replenishing developing containers with toner without replacing the development container, which can complicate the toner replenishment process.
Innovation Solution
The image forming apparatus incorporates a first and second developing unit with respective developing containers and rollers, a pump unit for air conveyance, and detachable toner containers with intake and discharge ports, allowing toner to be replenished through air flow via dedicated passages to the developing units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If toner containers are detachably attached to replenish developing containers, then toner replenishment becomes easier without replacing development containers, but the structure becomes more complex with additional components like intake ports, discharge ports, and passages
Solution Approach 1:
The toner container is divided into separate functional components: a toner storage chamber, an intake port for air entry, a discharge port for toner ejection, and internal passages for air flow. This segmentation allows each component to be optimized independently while maintaining ease of replenishment operation.
Solution Approach 2:
Air acts as an intermediary medium to transport toner from the toner container to the developing container. The air flow through the intake port, along the passages, and out the discharge port creates a pneumatic conveyance system that simplifies the replenishment process without requiring direct mechanical contact or complex transfer mechanisms.
2Productivity
If air is used to convey toner through passages, then toner can be efficiently replenished to developing units, but the toner container structure becomes more complex with filters and multiple chambers
Solution Approach 1:
The patent employs pneumatic principles by using air flow to convey toner through the container and into the developing unit. The air pressure differential created by the intake and discharge ports drives the toner through the passages, providing efficient and automated replenishment without mechanical intervention.
Solution Approach 2:
A filter is incorporated into the toner container structure to allow air passage while preventing toner leakage. This porous filtering mechanism enables the dual function of air intake and toner containment, maintaining replenishment efficiency while managing the structural complexity through a single integrated component.
3Productivity
If the discharge port opens in a direction intersecting the alignment direction of chambers, then toner discharge is optimized, but the overall apparatus size increases
Solution Approach 1:
The discharge port is oriented in a direction that intersects with the chamber alignment direction, utilizing three-dimensional spatial arrangement to optimize toner discharge. This angular orientation allows the air flow to effectively reach the developing unit while maintaining a compact overall footprint, avoiding the need for larger linear extensions.
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 enables efficient toner replenishment without detaching the developing units, facilitating easy maintenance and miniaturization of the apparatus while ensuring seamless toner supply to all developing units.
Implementation Method 1
a pump unit configured to send out air... the first toner discharged from the first discharge port is passed through the first passage to replenish the first developing container by the air discharged from the first discharge port and flowed into the first passage
Implementation Method 2
a filter configured to prevent passage of the toner and allow passage of air
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3B
AI summary
An image forming apparatus includes an apparatus main body that includes first and second developing units, an air pump unit, a first toner container accommodating the first toner and including a first intake port and a first discharge port, a second container accommodating the second toner and including a second intake port and a second discharge port, a first passage communicating with the first discharge port and extending to the first developing container, and a second passage communicating with the second discharge port and extending to the second developing container. The first toner is passed through the first passage to replenish the first developing container by the air discharged from the first discharge port and flowed into the first passage. The second toner is passed through the second passage to replenish the second developing container by the air discharged from the second discharge port and flowed into the second passage.