Manifold for Printhead with Segmented Fluid Path
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Solution Overview
Problem
Inkjet printers face issues with air bubbles entrapped in the ink path due to long flow paths and multiple connections, which negatively impact printing quality.
Innovation Solution
A printhead assembly with a manifold and integral inlet and outlet tubes that minimize the length of the fluid path and reduce the number of connections, using solenoid valves and a recirculation system to control fluid flow and purge air bubbles, ensuring a fluid-tight connection between the manifold and printheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the flow path from ink source to printhead is extended or multiple connections are added, then more printheads can be supplied with ink, but air bubbles become more likely to be entrapped in the ink path
Solution Approach 1:
The system divides the ink supply network into multiple independent flow paths, each with its own inlet tube and fluid inlet valve. This segmentation allows individual control and purging of each printhead's ink path, enabling maintenance of one printhead without affecting others, thus supporting multiple printheads while managing air bubble risks through isolated path management
Solution Approach 2:
The system performs preliminary purging actions through the recirculation system and fluid inlet valves before and during ink supply operations. By proactively removing air bubbles through recirculation before they can cause printing defects, the system enables extended flow paths to multiple printheads while pre-preventing the air bubble entrapment problem
2Adaptability or versatility
If the flow path length is increased to reach more printheads, then system coverage is improved, but the number of potential leak points increases
Solution Approach 1:
The ink supply system is segmented into discrete modular units, with each printhead receiving ink through its own dedicated inlet tube connected to the manifold. This modular segmentation limits the impact of potential leaks to individual tubes rather than compromising the entire system, enabling extended coverage through multiple printheads while containing leak risks within isolated segments
Solution Approach 2:
The manifold serves as an intermediary component that centralizes ink distribution to multiple printheads. By providing a single centralized connection point for all inlet tubes, the manifold reduces the number of external connections and potential leak points compared to a distributed connection system, thus enabling system coverage expansion while minimizing leak risks through centralized management
3Productivity
If multiple connections are added to supply ink to multiple printheads, then ink distribution capability is improved, but the complexity of the fluid path increases
Solution Approach 1:
Multiple individual ink supply connections are merged into a single centralized manifold structure. All inlet tubes from multiple printheads connect to this common manifold, which receives ink from a single ink source. This merging approach maintains the ink distribution capability to multiple printheads while simplifying the overall fluid path architecture by consolidating connections at one central location rather than requiring multiple separate supply lines
4Productivity
If the number of connections in the ink path is increased, then more printheads can be connected, but maintenance and repair difficulty increases
Solution Approach 1:
The system segments the ink supply into independent modular paths, each with its own inlet tube and fluid inlet valve. This segmentation enables isolated maintenance of individual printheads or tubes without requiring disassembly or repair of the entire system. Technicians can access and service specific components independently, making maintenance easier despite having multiple connected printheads
Solution Approach 2:
Individual inlet tubes can be extracted or removed from the manifold for separate servicing or replacement. The modular design allows specific tubes to be taken out for maintenance without affecting other printhead connections, simplifying repair operations while maintaining the ability to connect multiple printheads to the system
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 design reduces air bubble entrapment, improves printing quality, minimizes fluid volume, and simplifies connection and maintenance by reducing the complexity of fluid paths and potential leak points.
Implementation Method 1
Each of the multiple fluid inlet valves can be a solenoid valve
Data Source
AI summary
A printhead assembly is described including multiple printheads, a manifold and multiple inlet tubes. The printheads each include: a fluid inlet to receive fluid into the printhead; and a set of one or more nozzles to deposit fluid on a substrate. The manifold is connected to the printheads and includes: a fluid inlet duct configured to receive fluid for delivery to the printheads; multiple fluid inlet channels for connecting the fluid inlet duct to the printheads; and multiple fluid inlet valves configured to control a flow of fluid from the fluid inlet duct to each of the fluid inlet channels. The inlet tubes each have a proximal end integral to either the manifold or one of the printheads, and a distal end connected to either the manifold or said printhead with a single fluid-tight connection.