Particle Dispenser Nozzle Outer Shutter Rails Prevent Hang-ups
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Solution Overview
Problem
The existing particle dispenser cartridges often hang-up due to interference between short sealing ribs and the dispenser insert, especially during assembly, disassembly, or when the dispenser is misassembled or worn, leading to frequent service technician interventions.
Innovation Solution
The introduction of outer shutter rails on the dispenser nozzle surface, which extend beyond the sealing ribs, helps to prevent hang-ups by biasing the sealing ribs away from the insert, reducing interference and ensuring smooth cartridge rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sealing ribs are made short to reduce interference with the dispenser insert, then ease of assembly is improved, but reliability deteriorates due to hang-up problems during operation
Solution Approach 1:
The patent introduces an intermediary component (the rail structure with extended leading edge) that mediates between the sealing rib and the dispenser insert. This intermediary prevents direct interference between the short sealing rib and the insert, allowing the sealing rib to remain short for ease of assembly while preventing hang-up problems that would reduce reliability
Solution Approach 2:
The patent segments the functional requirements by separating the sealing function (performed by the sealing rib) from the interference prevention function (performed by the extended rail leading edge). This segmentation allows each component to be optimized independently - the sealing rib can be short while the rail provides the extended protection against hang-ups
2Reliability
If sealing ribs are extended to prevent hang-ups, then reliability is improved, but device complexity increases due to additional interference points
Solution Approach 1:
The patent extracts the interference prevention function from the sealing rib itself and places it on a separate structural element (the extended leading edge of the rail). This allows the sealing rib to remain simple while the rail structure provides the extended protection, avoiding the complexity that would result from making the sealing rib itself more complex
3Adaptability or versatility
If the dispenser is designed to tolerate misassembly or wear, then adaptability is improved, but manufacturing precision requirements increase to ensure proper rail alignment
Solution Approach 1:
The patent applies preliminary action by designing the rail structure with extended leading edges that proactively prevent interference before misassembly or wear can cause hang-up problems. This preliminary protective measure allows the dispenser to tolerate misassembly or wear conditions while the extended rails maintain proper alignment and prevent contact issues
Data Source
AI summary
A cylindrical-shaped particle dispenser cartridge includes a dispenser nozzle. The dispenser nozzle outer surface includes sealing ribs that surround an included nozzle opening. The dispenser nozzle is arranged to engage a shutter that slides over the sealing ribs, thus sealing the nozzle opening. When the cartridge rotates about the cartridge axial in a shutter-opening or leading direction (X) with respect to the shutter, the sealing ribs move in a like direction with respect to the shutter, thus unsealing the particle dispenser cartridge nozzle opening. The dispenser cartridge is arranged to dispense particles such as, for example, toner particles. The dispenser nozzle outer surface includes outer shutter rails disposed on inboard and outboard sides of the sealing ribs.