Diaphragm Control Unit for Large Format Inkjet Print Head Maintenance
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Solution Overview
Problem
In large format printing, tilting the beam array during maintenance causes ink to flow out of the print heads, leading to waste and inefficiency, and existing control valves are bulky, increasing pressure drops and material usage.
Innovation Solution
A compact diaphragm control unit is positioned in the ink flow pathway between the secondary ink tank and print heads, which can be activated to obstruct ink flow during maintenance, using external air pressure to move a diaphragm and maintain hydraulic pressure, minimizing pressure drops and allowing for a shorter pathway.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a traditional control valve is used to obstruct ink flow during maintenance, then ink wastage is prevented, but the valve increases pressure drops and requires more material usage
Solution Approach 1:
The invention extracts the essential function of flow obstruction from a traditional bulky valve and implements it using a diaphragm that can be selectively activated. The diaphragm is integrated directly into the ink pathway, eliminating the need for separate valve components while maintaining the ability to prevent ink wastage during maintenance operations.
Solution Approach 2:
The invention uses a flexible diaphragm membrane to control ink flow instead of a rigid traditional valve. The diaphragm can be deformed or positioned to obstruct flow when needed, while its thin-film nature minimizes pressure drops and material usage compared to conventional valve bodies.
2Loss of substance
If a traditional control valve is used to obstruct ink flow, then ink wastage is prevented, but the device complexity and material usage increase
Solution Approach 1:
The invention extracts the flow control function from a complex traditional valve assembly and implements it using a simple diaphragm mechanism integrated into the ink pathway. This reduces device complexity while maintaining the ability to prevent ink wastage during maintenance.
Solution Approach 2:
The flexible diaphragm provides a simple yet effective flow obstruction mechanism that replaces complex valve assemblies. The diaphragm's ability to deform and seal the pathway uses minimal material and structural complexity while achieving the same ink wastage prevention function.
3Ease of operation
If the beam array is tilted during maintenance, then accessibility is improved, but ink flows out of the print heads causing wastage
Solution Approach 1:
The invention implements preliminary action by providing a control mechanism that can be activated before maintenance begins. The diaphragm can be positioned to obstruct ink flow in advance, preventing wastage that would otherwise occur when the beam array is tilted for maintenance access.
Solution Approach 2:
The diaphragm acts as an intermediary element between the ink reservoir and the print heads, controlling flow independently of the beam array position. This mediator allows maintenance personnel to tilt the beam array for accessibility without causing ink wastage, as the diaphragm prevents flow when activated.
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
Prevents ink wastage during maintenance, reduces pressure drops, and allows for a more compact and efficient ink pathway, minimizing material usage and risk of corrosion, while maintaining ink flow control.
Implementation Method 1
The diaphragm control unit can be activated to obstruct ink flow during maintenance, using external air pressure to move a diaphragm and maintain hydraulic pressure, minimizing pressure drops
Implementation Method 2
The geometry of the diaphragm control box maintains a hydraulic pressure between a first channel of the pathway and a second channel of the pathway, minimizing pressure drops
Data Source
Figure 1
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AI summary
Controlling an ink flow to a print head includes using a diaphragm positioned within a pathway to obstruct the ink flow.