Liquid Discharge Device Ink Level Stabilization
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Solution Overview
Problem
Existing liquid discharge devices, such as inkjet printers, face challenges in accurately determining the liquid level signal from sensors due to variations in water head differences between the main and sub tanks, leading to inconsistent ink level detection and correction times.
Innovation Solution
A liquid discharge device with a controller that receives a discharge instruction, controls the liquid head, determines a waiting time based on post-discharge liquid information, and accurately determines the signal from the liquid level sensor after this waiting time has elapsed, ensuring precise ink level detection and correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the liquid level sensor determines the signal immediately after discharge completion, then the response time is short, but the liquid level may not have stabilized causing inaccurate detection
Solution Approach 1:
The controller preliminarily determines the waiting time based on discharge information before actually measuring the liquid level. This allows the system to prepare for accurate measurement by calculating the required stabilization time in advance, ensuring the liquid level has settled before detection occurs.
Solution Approach 2:
The system uses feedback from discharge information (such as discharge amount and duration) to dynamically adjust the waiting time. The controller receives feedback about the discharge process and uses this information to determine an appropriate waiting period that ensures liquid level stabilization while minimizing unnecessary delays.
2Adaptability or versatility
If a fixed waiting time is used after discharge, then the control logic is simple, but it cannot adapt to varying discharge amounts causing either delayed detection or premature measurement
Solution Approach 1:
The waiting time is made dynamic rather than fixed. The controller adjusts the waiting time based on discharge information such as the amount of liquid discharged and the duration of discharge. This dynamic adjustment allows the system to adapt to varying discharge conditions while maintaining reasonable control logic complexity.
Solution Approach 2:
The system changes the parameter of waiting time based on discharge parameters. By linking the waiting time to discharge information (such as discharge volume or flow rate), the system achieves adaptability to different discharge scenarios without requiring complex control algorithms.
3Measurement precision
If the sensor detection position is fixed, then the structure is simple, but it cannot accurately detect liquid level when water head difference causes level variations
Solution Approach 1:
The system incorporates feedback from discharge information to determine an appropriate waiting time that allows the liquid level to stabilize. This feedback mechanism enables accurate detection at the fixed sensor position even when water head differences occur during discharge operations.
Solution Approach 2:
The controller preliminarily determines the waiting time based on discharge information before performing the liquid level detection. This preliminary action ensures that the liquid level has stabilized due to water head difference equalization before the sensor takes the measurement, maintaining detection accuracy without changing the sensor position.
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
This solution allows for accurate determination of the liquid level signal, even when the level temporarily descends and ascends, preventing misinterpretation and ensuring efficient ink management and usage.
Implementation Method 1
the ink moves so that the liquid level of the main tank and the liquid level of the sub tank are aligned with the same height by the difference between a water head in the internal space of the main tank and a water head in the internal space of the sub tank
Data Source
AI summary
The liquid discharge device performs a series of process including: controlling a head to discharge ink in response to receiving discharge instruction; calculating a waiting time Tw based on ink discharge amount Dh after completing the discharge of the ink; executes counting process based on a signal received from a liquid level sensor after elapse of the waiting time T2 from the completion of discharging the ink from the head.