Multi-Needle Ink Injection Timing for Filter Pressure Control
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Solution Overview
Problem
Existing methods for injecting liquids into liquid storage containers, such as ink tanks for print heads, face complexity in controlling liquid pressure on filters, leading to potential leaks during filling.
Innovation Solution
A method using multiple injection needles to inject liquids into a liquid holding member, where the timing and flow rates of the injections are controlled to create a meeting surface closer to one needle than others, increasing pressure on the filter and preventing leaks without increasing ink volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid injection pressure is increased to ensure efficient filling, then filling speed improves, but liquid may leak through ejection openings of the print head
Solution Approach 1:
The invention divides the liquid injection process into multiple segments by using multiple injection needles positioned at different locations (above and below the filter). This segmentation allows independent control of injection pressure and flow for each needle, enabling efficient filling while preventing leaks through coordinated pressure management.
Solution Approach 2:
The invention applies different injection pressures and flow rates to different injection needles based on their local positions relative to the filter. The injection needle above the filter operates at a lower pressure to prevent leakage, while needles below the filter can operate at higher pressures for efficient filling, creating localized quality differences in the injection process.
2Productivity
If multiple injection needles are used to increase filling efficiency, then filling speed improves, but control of liquid pressure on the filter becomes complex
Solution Approach 1:
The invention performs preliminary positioning of multiple injection needles at specific locations relative to the filter before the filling process begins. This preliminary arrangement establishes a predetermined flow pattern where liquid from needles above and below the filter meets at a controlled interface, simplifying the overall pressure control strategy during filling.
Solution Approach 2:
The invention creates an equipotential liquid interface (meeting surface) where liquid from multiple injection needles converges at a balanced pressure point between needles above and below the filter. This equipotential approach equalizes pressure distribution at the liquid-liquid interface, simplifying control while maintaining efficient filling from multiple needles.
3Productivity
If injection needle is positioned above the filter, then liquid can be injected efficiently, but pressure control becomes difficult and may cause leakage
Solution Approach 1:
The invention employs asymmetric positioning and control of injection needles relative to the filter, with different numbers of needles above and below the filter and different injection parameters for each position. This asymmetric configuration allows optimized injection efficiency from needles above the filter while maintaining reliability through compensatory control from needles below the filter.
Solution Approach 2:
The invention uses injection needles positioned below the filter as a counterbalancing mechanism to offset the pressure and flow from needles above the filter. By coordinating the injection parameters of needles on both sides of the filter, the system creates a balanced pressure distribution that prevents leakage while maintaining high injection efficiency.
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 approach allows for effective control of liquid pressure on the filter, ensuring efficient filling without leaks, by varying the timing and flow rates of ink injections from multiple needles, thus optimizing the filling process.
Implementation Method 1
a meeting surface between a liquid injected from the injection needle above the filter and a liquid injected from an injection needle adjacent to the injection needle above the filter is located closer to the injection needle above the filter than the injection needle adjacent to the injection needle above the filter
Data Source
AI summary
A meeting surface between inks injected from the injection needles can be made closer to the filter by varying the timings of the ink injections from the plurality of injection needles, whereby larger pressure is applied to the filter. When pressure is applied which is larger than the ink holding force of the filter generated from the surface tension of the inks, the inks pass through the filter to fill space from an ink supply path to an ink path in a print head. In this manner, ink pressure on the filter can be appropriately controlled without increasing the amount of the ink from the injection needle above the filter. As a result, the inks pass through the filter to fill the ink path in the print head, and the inks can be prevented from leaking from ejection openings at the time of filling the inks.