Ink Reservoir Vacuum Port Foam Detection Sensor
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Solution Overview
Problem
Inkjet printing systems face catastrophic contamination of the vacuum control system due to ink or foam intrusion, leading to significant downtime and costs, despite existing protection measures.
Innovation Solution
An ink reservoir with a first portion for holding ink and a second portion that includes a vacuum port and a resistive-based temperature sensor to detect ink or foam, triggering an alert to stop printing and prevent further rise into the vacuum supply line, while the second portion's design inhibits froth adhesion and collapse, preventing intrusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a vacuum control system is used to prevent ink drooling, then ink flow control is improved, but the system becomes vulnerable to catastrophic contamination from air infiltration
Solution Approach 1:
The patent introduces an intermediary chamber between the ink supply and the vacuum control system. This chamber acts as a buffer zone where ink level detection occurs, preventing direct contact between ink/foam and the vacuum system while maintaining vacuum control functionality
Solution Approach 2:
The patent implements preliminary detection of ink level and foam formation before they can enter the vacuum system. By detecting ink level changes and foam presence in advance, the system can take preventive action to stop ink flow before contamination occurs
2Reliability
If ink level detection is implemented to prevent foam intrusion, then vacuum system protection is improved, but device complexity increases
Solution Approach 1:
The patent makes the chamber serve multiple functions: it acts as both an ink level detection zone and a foam containment area, and the sensor serves both to detect ink level and trigger shutdown. This multi-functionality reduces the need for separate dedicated components
Solution Approach 2:
The system uses the ink/foam itself as the detection mechanism through the sensor that detects contact with the liquid/foam interface. The harmful substance (foam) directly triggers the protective response, eliminating the need for complex external detection systems
3Device complexity
If foam accumulation is allowed to rise, then ink level monitoring is simplified, but catastrophic contamination becomes more likely
Solution Approach 1:
The patent implements a feedback loop where the sensor continuously monitors the chamber environment and provides real-time information about ink level and foam presence. When foam reaches a certain level, the feedback triggers an automatic shutdown to prevent contamination
Solution Approach 2:
The patent replaces complex mechanical foam detection mechanisms with a simpler sensor-based detection system that detects foam through electrical or optical properties, reducing mechanical complexity while maintaining effective monitoring
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
Prevents or reduces the potential for ink and foam intrusion into the vacuum control system, minimizing downtime and costs associated with system restoration.
Implementation Method 1
The sensor is positioned to receive contact from, and to electronically detect, foam and/or ink that rises out of the first portion and into the chamber
Implementation Method 2
Inkjet printing systems rely on application of a vacuum or negative pressure on the ink supply to help control or prevent drooling of ink at a printhead by causing and maintaining a meniscus in the ink supply line
Implementation Method 3
the chamber of the second portion is sized and shaped to induce a natural reduction or dissipation of froth that results from air infiltration into the ink supplied under vacuum to the printhead
Data Source
AI summary
A reservoir of an ink supply system is described.