Dual Dispenser Speed Reduction for Unequal Pump Strokes
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Solution Overview
Problem
Existing dual dispensers with different actuating pin travels fail to simultaneously dispense doses at varying speeds using a common axial piston, necessitating compensation systems or proportional movements.
Innovation Solution
A dual dispenser with reduced speed transmission means between a common axial piston and a second actuating pin, allowing for simultaneous but different speeds of displacement through mechanisms like actuating cams or levers, ensuring the shorter travel pin moves slower than the longer one.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common piston is used to actuate both actuating pins, then the structure is simplified and simultaneous actuation is achieved, but the pins cannot move at different speeds
Solution Approach 1:
A speed reduction mechanism acts as an intermediary between the common piston and the second actuating pin. This intermediary device converts the uniform motion from the common piston into differential motion, allowing the first actuating pin to move faster than the second actuating pin while maintaining simultaneous actuation and simplifying the overall piston structure.
2Adaptability or versatility
If the travel of the second actuating pin is limited to be shorter than the first, then dose proportioning is achieved, but the pins must move at the same speed causing the longer pin to wait
Solution Approach 1:
The speed reduction mechanism introduces dynamic motion control, allowing the second actuating pin to move slower than the first actuating pin during the dispensing cycle. This dynamic speed differentiation eliminates idle waiting time for the longer-travel pin while maintaining the shorter travel distance for dose proportioning, enabling continuous efficient operation.
3Adaptability or versatility
If compensation systems are used to handle different pin travels, then different travels are accommodated, but the system complexity increases with sliding or telescopic connections
Solution Approach 1:
The speed reduction mechanism serves as a simplified intermediary that directly addresses the different travel requirements through differential motion control. Instead of complex sliding or telescopic compensation systems, this mechanism accommodates different pin travels by inherently providing different speeds, thereby reducing overall system complexity while maintaining adaptability.
Data Source
AI summary
A dual dispenser having two pumps, a first pump with a first actuating pin axially displaceable over a first maximum travel, and a second pump with a second actuating pin axially displaceable over a second maximum travel. The dispenser has a common piston axially displaceable and that acts axially and directly on the first actuating pin to drive it over its first maximum travel. The first maximum travel is greater than the second maximum travel. The dispenser includes reduced a speed transmission mechanism acting between the common piston and the second actuating pin to transmit the axial thrust force of the common piston to the second actuating pin with a reduced speed of the second actuating pin with respect to that of the first actuating pin.