Liquid Ejection Apparatus Ink Mixing Prevention
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Solution Overview
Problem
In inkjet recording apparatuses, the mixing of different ink colors during the filling process can lead to backward flow and contamination of the liquid path, causing ejection failures and affecting recording quality.
Innovation Solution
A liquid ejection apparatus with a cap member that covers multiple ejection orifices and a pressure control mechanism to manage the flow between first and second liquid tanks, preventing ink mixing by controlling pressures and using a flow path switching unit to isolate and connect the tanks, ensuring efficient ink filling without color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different types of liquids are stored in separate tanks and flow across ejection orifices, then the liquid ejection apparatus can perform multi-color recording, but the liquids may mix during the filling process causing contamination and ejection failures
Solution Approach 1:
The liquid path is segmented into separate flow regions for different liquids, with each liquid confined to its own tank and flow channel. The cap member creates separate sealed spaces for each ejection orifice, preventing cross-contamination while enabling multi-color recording through controlled liquid flow paths.
Solution Approach 2:
A cap member is introduced as an intermediary component that covers the ejection orifices and forms sealed spaces. This cap member acts as a barrier that prevents liquid mixing during filling while allowing controlled liquid ejection, thus maintaining reliability during multi-color recording operations.
2Reliability
If a cap member covers multiple ejection orifices to prevent liquid outflow, then ink filling reliability is improved, but different ink colors may mix in the sealed space causing contamination
Solution Approach 1:
The sealed space under the cap member is segmented into separate regions corresponding to each ejection orifice. Each liquid type is confined to its own region through controlled flow paths from separate tanks, preventing color mixing while maintaining the sealing function of the cap member during filling operations.
Solution Approach 2:
Different local conditions are created within the sealed space by establishing separate flow paths and pressure zones for each liquid type. Each ejection orifice region maintains its own liquid type through localized pressure control and flow path design, preventing contamination while preserving the cap member's protective function.
3Productivity
If pressure is applied to fill liquid tanks, then filling speed is improved, but uncontrolled pressure may cause liquid to flow backward and mix colors
Solution Approach 1:
The pressure control system dynamically adjusts pressure levels for each liquid tank independently. During filling, pressure is applied to accelerate liquid flow, but the system maintains dynamic control to prevent backward flow and mixing. The cap member's sealed spaces also dynamically isolate different liquids during pressure changes, ensuring purity while maintaining high filling speed.
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
The solution effectively prevents ink mixing and ensures reliable filling of the liquid path, reducing the risk of ejection failures and improving recording quality by maintaining separate ink flows for each color.
Implementation Method 1
a pressure control mechanism which simultaneously pressurizes the first and second liquid tanks
Data Source
AI summary
A liquid ejection apparatus includes a plurality of liquid ejection units ejecting different types of liquids. Each liquid ejection unit includes an ejection orifice which ejects a liquid, first and second liquid tanks which store the liquid, and a liquid flow path which connects the first liquid tank and the second liquid tank to each other across the ejection orifice. The liquid ejection apparatus further includes a cap member which covers of the ejection orifices of the plurality of liquid ejection units and forms a space sealed between the ejection orifices of the plurality of liquid ejection units and the cap member, and a pressure control mechanism which simultaneously pressurizes the first and second liquid tanks.