Air Pressure Sensor for Refill System Fill Level Detection
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Solution Overview
Problem
Existing printing systems face reliability issues due to false positive signals from differential pressure sensors, leading to incomplete or overfilling of intermediate tanks, which can result in either starving the printing device or contaminating components.
Innovation Solution
Implementing an air pressure sensor to monitor the frequency and slope of air pump cycles, providing an additional level of monitoring to verify the fill state of tanks, ensuring accurate detection of the end of refill and preventing overfilling or underfilling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If differential pressure sensors are used to monitor tank fill levels, then the printing system can detect end of refill and empty states, but false positive signals occur leading to incomplete or overfilling of intermediate tanks
Solution Approach 1:
An air pressure sensor is introduced as an intermediary monitoring device between the air pump and the differential pressure sensor system. This additional sensor provides independent verification of tank fill levels, acting as a mediator to validate readings from the primary differential pressure sensor and eliminate false positive signals that cause incomplete or overfilling of intermediate tanks.
2Productivity
If air pump cycles are monitored using differential pressure sensors, then refill operations can be controlled, but false signals lead to either starving the printing device or contaminating components
Solution Approach 1:
The system implements a feedback mechanism where the air pressure sensor continuously monitors air pressure during refill operations and provides real-time data to verify the fill state of intermediate tanks. This feedback loop ensures that the air pump cycles are properly controlled, preventing both starvation of the printing device (incomplete filling) and component contamination (overfilling), thereby maintaining continuous productive operation.
3Device complexity
If a single differential pressure sensor is used for monitoring, then the system structure remains simple, but the reliability of fill level detection is insufficient
Solution Approach 1:
The patent merges the functionality of multiple monitoring approaches by combining the differential pressure sensor system with an additional air pressure sensor. This combination integrates two different measurement methods into a unified monitoring system that cross-validates readings, significantly improving fill level detection reliability while maintaining relatively simple system architecture through shared control electronics and integrated sensor mounting.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the reliability of tank fill level detection by reducing false positives and ensuring tanks are filled to the desired level, preventing damage to components and maintaining continuous printing operations.
Implementation Method 1
an air pressure sensor to monitor the frequency and slope of air pump cycles
Implementation Method 2
a printhead receives a stream of printing fluid from an intermediate tank which is supplied with ink from a supply tank. Printing fluid can be fed from the intermediate tank to the printhead using an air pump
Data Source
AI summary
A fluid supply device includes a variable fluid volume to contain a supply of fluid and a variable gas volume to receive pressurized gas to pressurize the supply of fluid. A method of monitoring the fluid supply device may include controlling a gas pressure of the pressurized gas to feed the fluid from the fluid volume, the gas pressure varying in a plurality of pressurization cycles; monitoring a parameter of the pressurization cycles; and determining a change in fill state of the fluid volume as a function of the monitored parameter.