Liquid Ejecting Device Adaptive Discharge Control
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Solution Overview
Problem
Inkjet printers face issues with ink drying in nozzles due to evaporation when the closed space forming portion is left open, leading to reduced liquid accommodation and frequent printing stops for liquid discharge, which disrupts the printing process.
Innovation Solution
A liquid ejecting device with a closed space forming portion containing a porous member, a discharging portion, and a control system that adjusts the discharge timing based on the number of stops, reducing the prescribed liquid amount as stops increase, and utilizing a second liquid with lower defoaming properties to improve liquid absorption and emission properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the closed space forming portion is left in an opened state, then the liquid can be discharged easily, but solvent evaporation occurs making it difficult for liquid to be discharged
Solution Approach 1:
The control portion performs preliminary action by predicting the number of stops before they occur and pre-adjusting the prescribed value accordingly. This prevents solvent evaporation issues by proactively managing liquid discharge timing based on anticipated stops, ensuring the closed space is properly managed before evaporation can occur.
Solution Approach 2:
The system implements feedback by monitoring actual stop occurrences and using this information to adjust future liquid discharge decisions. The control portion accumulates stop information and uses it to dynamically adjust the prescribed value, creating a closed-loop system that adapts to actual operating conditions and prevents solvent evaporation problems.
2Reliability
If liquid discharge timing is set for reduced accommodation capacity, then liquid can be discharged completely, but printing stops frequently
Solution Approach 1:
The control portion performs preliminary adjustment of the prescribed value based on predicted stop information before stops occur. By pre-calculating the appropriate discharge threshold considering future stops, the system ensures complete liquid discharge while minimizing unnecessary printing interruptions, as the prescribed value is already optimized for the anticipated operating conditions.
Solution Approach 2:
The system dynamically adjusts the prescribed value based on the number of stops. The control portion changes the discharge threshold according to operating conditions - using higher values when stops are anticipated (reducing discharge frequency) and adjusting accordingly to balance complete liquid removal with printing continuity, making the system adaptive rather than static.
3Device complexity
If the prescribed value is kept constant, then control is simple, but it cannot adapt to varying stop conditions affecting liquid accommodation
Solution Approach 1:
The control portion dynamically adjusts the prescribed value based on the number of stops. The system transitions from a static fixed threshold to a dynamic adaptive threshold that automatically modifies the liquid discharge criterion according to predicted and actual stop conditions, enabling the system to adapt to varying operating scenarios while maintaining automated control.
Solution Approach 2:
The system uses feedback from stop information (both predicted and actual) to continuously adjust the prescribed value. The control portion accumulates stop data and uses this feedback loop to optimize the discharge threshold, creating an adaptive control system that responds to operating conditions while maintaining automated decision-making without requiring complex manual intervention.
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 configuration reduces the frequency of printing stops by optimizing liquid discharge timing and amount, maintains nozzle viscosity, and enhances liquid absorption and emission properties, thereby improving printing efficiency and reducing liquid consumption.
Implementation Method 1
a porous member configured to absorb the liquid
Implementation Method 2
a liquid ejecting portion configured to eject liquid from a nozzle
Implementation Method 3
an discharging portion configured to discharge the liquid in the closed space forming portion
Data Source
AI summary
A liquid ejecting device includes a liquid ejecting portion configured to eject liquid from a nozzle, a closed space forming portion having a porous member inside thereof, and configured to form a closed space in which the nozzle opens, an discharging portion configured to discharge the liquid in the closed space forming portion, and a control portion configured to, when an amount of the liquid ejected from the liquid ejecting portion into the closed space forming portion reaches a prescribed value, cause the discharging portion to discharge the liquid in the closed space forming portion, wherein the control unit decreases the prescribed value as the number of stops increases, the number of stops being the number of times the liquid ejecting portion is stopped for a prescribed time or longer at a position other than a closed position where the closed space is formed.