Shutter Assembly with Decoupling Lever for Toner Leakage Prevention
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Solution Overview
Problem
Toner leakage during shipment of electrophotographic imaging devices is a persistent issue due to jostling of shutters, leading to spills and potential print defects, with existing solutions like removable plugs and seals being costly and unreliable.
Innovation Solution
A shutter assembly with a lever and latch mechanism that allows the toner entry port to remain sealed during shipping, decoupling from the shutter to prevent toner leakage, and automatically reconfiguring to the open position upon installation, ensuring effective toner containment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shipping separators such as removable plugs, seals, foams, and/or tape are used to prevent toner leakage during shipment, then toner containment is improved, but cost increases and reliability decreases due to assembly variation and improper removal
Solution Approach 1:
The invention extracts the sealing function from separate shipping separators and integrates it into the shutter assembly itself. The shutter acts as both the operational component for toner transfer and the sealing component during shipping, eliminating the need for separate plugs, seals, foams, and tape.
Solution Approach 2:
The shutter assembly serves multiple functions: it controls toner transfer during normal operation and provides sealing during shipping. This multi-functionality reduces the number of separate components needed and simplifies the overall system while improving reliability.
2Reliability
If removable plugs, seals, and/or foams are used to seal toner ports during shipment, then toner leakage is prevented, but assembly variation upon installation by human operators may still result in toner leaks
Solution Approach 1:
The shutter assembly is designed to be self-sealing through its own structure. The lever mechanism automatically positions the shutter to seal the toner port during shipping without requiring separate sealing components or precise manual assembly, eliminating assembly variation issues.
3Reliability
If shipping box size is increased to accommodate toner cartridges left out of imaging devices during shipment, then toner leakage is prevented, but packaging cost and shipping cost increase
Solution Approach 1:
The shutter is pre-configured to the closed position during shipping, allowing the toner cartridge to remain installed in the imaging device during transport. This preliminary sealing action prevents the need for increased box size and reduces shipping costs while maintaining toner containment.
4Ease of operation
If the shutter remains coupled to the lever during toner cartridge removal, then the shutter may close prematurely, but decoupling the shutter complicates the mechanism
Solution Approach 1:
The shutter assembly transitions from a static coupled state to a dynamic decoupled state based on operational needs. The spring mechanism automatically couples the shutter to the lever during toner cartridge installation and decouples it during removal, providing the necessary dynamic behavior without excessive complexity.
Data Source
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AI summary
A developer unit (34) including a housing having an opening and defining a volume forming a toner chamber. A shutter (305) is disposed on the housing and rotatably mounted relative to the opening (205) thereof. The shutter includes an aperture (425) and is operative to retain toner within the developer unit in a substantially sealed manner when in a closed orientation in which the aperture is not aligned with the opening of the housing, and to allow toner to flow into the toner chamber through the opening of the housing when in an open orientation in which the aperture is aligned with the opening of the housing. A lever (315) is selectively coupled to the shutter and rotationally mounted to the housing such that when the lever is coupled to the shutter, rotation of the lever causes rotation of the shutter between the open and closed orientations, and when the lever is decoupled from the shutter, the lever is rotatable relative to the housing without causing the shutter to rotate.