Powder Feed Device Shutter Actuation Mechanism
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Solution Overview
Problem
Existing powder feed devices in image forming apparatuses face issues with toner aggregation and defective feed due to the lack of effective mechanisms to prevent toner from accumulating before initial operation, leading to inefficient transport and potential blockages.
Innovation Solution
A powder feed device with a cylindrical casing and a transport member that includes both a transport portion for moving toner and a non-transport portion to open a shutter, ensuring the toner is only transported when the device is operational, preventing aggregation and ensuring smooth flow by maintaining the shutter in an open position until operation begins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shutter member is added to control powder flow, then toner aggregation is prevented, but device complexity increases
Solution Approach 1:
The shutter member is integrated with the transport member such that the transport member directly drives the shutter member to open/close without requiring separate actuation mechanisms. This merging of functions reduces the number of components while maintaining the shutter control capability needed to prevent toner aggregation.
Solution Approach 2:
The transport member serves dual functions: transporting toner from the housing to the development unit, and simultaneously actuating the shutter member to control powder flow. This multi-functionality eliminates the need for separate shutter actuation mechanisms, reducing device complexity while ensuring reliable toner feed control.
2Reliability
If the shutter remains closed to prevent aggregation, then toner flow is controlled, but transport efficiency decreases
Solution Approach 1:
The shutter member periodically opens and closes in synchronization with the transport member's rotation. The shutter remains closed during periods when no transport is needed to prevent aggregation, and opens during transport cycles to enable efficient toner flow. This periodic action optimizes both flow control and transport efficiency.
Solution Approach 2:
The shutter member is positioned and prepared in advance to open exactly when the transport member arrives at the discharge position. This preliminary positioning ensures that the shutter is already open when toner needs to be discharged, maximizing transport efficiency while maintaining control over when powder flow occurs.
3Device complexity
If the transport member handles both toner transport and shutter actuation, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The transport member is divided into distinct functional segments: a toner transport portion with helical blades for moving powder, and a non-transport portion that engages with the shutter member. This segmentation allows each portion to be optimized for its specific function while maintaining overall simplicity, reducing the need for high-precision manufacturing across the entire component.
Solution Approach 2:
Different portions of the transport member have different functional qualities: the transport portion features helical blades optimized for powder movement, while the non-transport portion has engagement features optimized for shutter actuation. This local differentiation allows each region to be manufactured with appropriate precision levels for its specific function, reducing overall manufacturing complexity.
Data Source
AI summary
A powder feed device includes a casing having an opening for receiving a powder from a powder housing portion housing the powder, at least an inner side of the casing having a cylindrical shape; a transport member that is arranged in the casing, extends in a powder transport direction, and rotates and transports the powder to the fed body; and a shutter member that is arranged at a closed position for closing the opening, receives a force from the transport member by its rotation, and moves to an open position for opening the opening. The transport member includes a transport portion that contributes to the powder transport, and a non-transport portion that does not contribute to the powder transport, and handles the movement of the shutter member to the open position. The shutter member moves to the open position when receiving an effect of the non-transport portion.