Compact Detachable Fluid Coupling for Inkjet Printheads
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Solution Overview
Problem
Pagewidth printheads in inkjet printers face challenges with ink supply and distribution due to high flow rates and complex conduit systems, leading to issues like nozzle flooding and inconsistent priming, particularly in full-color printing setups where multiple detachable couplings are required for fluid tight seals and user convenience.
Innovation Solution
The integration of a support structure with ink conduits and fluidic dampers containing gas for pressure pulse damping, along with weir formations and pulse dampers distributed along the printhead, helps manage ink flow and pressure spikes, ensuring a compact design and preventing nozzle flooding. Additionally, a detachable fluid coupling with a resilient sleeve and a compact filter design enhance the inkjet printer's fluid management system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple detachable couplings are used for full-color printing, then fluid tight sealing and user convenience are improved, but device complexity and cartridge size increase significantly
Solution Approach 1:
The patent combines multiple coupling functions into a single integrated detachable interface. Instead of having separate couplings for each color channel (CMYK), the invention uses one unified coupling mechanism that handles all ink supply lines, thereby maintaining fluid tight sealing for full-color printing while avoiding the complexity and size increase that would result from multiple separate couplings.
Solution Approach 2:
The detachable coupling is designed as a universal interface that serves multiple functions simultaneously: it provides fluid tight sealing for multiple color channels, enables easy cartridge replacement, and integrates the sealing mechanism across all ink supply lines. This multi-functional design eliminates the need for separate couplings for each color, reducing overall device complexity while maintaining reliability.
2Productivity
If high flow rates are used for high-speed printing, then productivity is improved, but ink supply stability and nozzle flooding control deteriorate
Solution Approach 1:
The patent incorporates a fluid damper in the ink supply system that acts as a cushioning element before pressure pulses can reach the printhead. This damper absorbs and smooths out pressure fluctuations caused by high flow rates, preventing nozzle flooding while maintaining the high productivity required for fast printing speeds.
Solution Approach 2:
The fluid damper serves as an intermediary element between the ink supply and the printhead. It mediates the high flow rate ink supply by filtering and stabilizing the ink flow, removing pressure spikes before they reach the delicate nozzle array, thus ensuring stable ink supply even at high printing speeds.
3Quantity of substance
If complex ink distribution systems are used for pagewidth printheads, then ink coverage is improved, but manufacturing complexity and conduit design difficulty increase
Solution Approach 1:
The patent segments the ink distribution system into modular components: a main ink supply channel and multiple branch channels that distribute ink to different nozzle sections. This segmentation allows for easier manufacturing of each individual conduit section while achieving comprehensive ink coverage across the entire pagewidth printhead array.
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 manages ink flow and pressure pulses, preventing nozzle flooding and ensuring consistent priming across the printhead array, while maintaining a compact design and improving user convenience through efficient fluid communication and sealing mechanisms.
Implementation Method 1
a fluidic damper containing gas for compression by pressure pulses in the ink within the ink conduits to dissipate the pressure pulse
Implementation Method 2
each of the cavities is partially defined by an ink meniscus when the ink conduits of the support structure are primed with ink
Data Source
AI summary
A detachable fluid coupling for connecting an inkjet printhead with an ink supply, the detachable coupling having a fixed valve member defining a valve seat, a sealing collar (146) for sealing engagement with the valve seat (148), a resilient sleeve (126) having one annular end fixed relative to the fixed valve member (128), and the other annular end engaging the sealing collar to bias it into sealing engagement with the valve seat. The coupling also having a conduit opening (150) that is movable relative to the fixed valve member for engaging the sealing collar (146) to unseal it from the valve seat. Unsealing the sealing collar from the valve seat compresses the resilient sleeve (126) such that an intermediate section of the sleeve displaces outwardly relative to the annular ends. With a resilient sleeve that buckles or folds outwardly, the diameter of the coupling is smaller that the conventional couplings that use an annular resilient element that biases the valve shut remaining residual tension. With a smaller outer diameter, the couplings for all the different ink colors can be positioned in a smaller more compact interface.