Developer Cartridge Shutter Protrusion for Leakage Prevention
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Solution Overview
Problem
Existing developing units for image forming apparatuses face issues with developer leakage and scattering when the developer cartridge is mounted or removed, as developer particles adhere to the circumference of opening passages and can be scattered outside.
Innovation Solution
A developing unit design where a shutter with a protruding portion is used to prevent developer leakage by ensuring that developer particles attached to the shutter's upstream end are blocked from escaping when the shutter moves from an open to a closed position, and a developer cartridge with a movable second frame that includes protruding ends to prevent developer scattering during cartridge removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the shutter is moved from open to closed position during developer cartridge removal, then developer leakage is prevented, but developer particles attached to the shutter's upstream end can scatter outside
Solution Approach 1:
A protruding portion is provided on the shutter to preliminarily block developer particles that may be attached to the upstream end of the shutter opening. This preliminary blocking action prevents developer scattering before it can occur during shutter movement or cartridge removal.
Solution Approach 2:
The protruding portion acts as an intermediary element between the shutter opening and the external environment. It intercepts and contains developer particles that might otherwise scatter, mediating between the internal developer-containing space and the external area.
2Object-affected harmful factors
If the developer cartridge is made with a movable second frame for sealing, then developer leakage is prevented, but the structure becomes more complex
Solution Approach 1:
The developer cartridge is divided into two frames: a first frame that accommodates developer and a second frame that moves to provide sealing. This segmentation allows the sealing function to be separated from the developer storage function, enabling effective leakage prevention while maintaining operational simplicity.
Solution Approach 2:
The second frame is designed to be movable rather than fixed, allowing it to dynamically adjust position for sealing and non-sealing operations. This dynamic structure enables the cartridge to transition between different functional states (open/closed, mounted/unmounted) while maintaining simplicity.
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A developing unit includes a developer cartridge for accommodating developer and including a first opening for enabling communication between an inside of the developer cartridge and an outside of the developer cartridge, a housing including a cartridge housing part and a second opening provided in a position opposite to the first opening and formed toward the cartridge housing part, a shutter including a third opening and being movable between an open position and a closed position, and a protruding portion provided at an upstream end portion of the third opening in a movement direction of the shutter from the open position to the closed position and including a first end at a side close to the first opening and a second end at a side close to the second opening. The first end protrudes more downstream in the movement direction than the second end.