Staggered Printhead Array with Bypass Ink Lines
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Solution Overview
Problem
Wide format inkjet printers face challenges such as slow printing speeds, complex maintenance, aerosol generation, and ink delivery issues due to the large array of inkjet nozzles and the need for precise media control, which are not adequately addressed by existing technologies.
Innovation Solution
A printing system with a staggered array of printheads spanning the media path, utilizing a vacuum platen assembly for media transport and service modules for maintenance, and an aerosol collection system to manage ink delivery and aerosol removal, allowing for efficient printing and reduced maintenance complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pagewidth printhead assembly is used to print the entire width of the page simultaneously, then printing speed is significantly increased, but the number of inkjet nozzles and heat generation become excessively high requiring impractical cooling systems
Solution Approach 1:
The printhead assembly is divided into multiple modular printheads (first printhead, second printhead, etc.) arranged in a staggered configuration. Each printhead handles a portion of the print width, reducing the number of nozzles per printhead and consequently lowering heat generation per module while maintaining overall pagewidth printing capability.
Solution Approach 2:
The printheads are arranged in a staggered spatial configuration rather than a linear single-row arrangement. This multi-dimensional layout allows ink ejection zones to be distributed across different positions, reducing concentrated heat generation and enabling better thermal management while achieving full width coverage.
2Area of stationary object
If a large array of inkjet nozzles is used to span the entire media width, then print width coverage is improved, but maintenance complexity increases significantly
Solution Approach 1:
The printhead assembly is segmented into multiple independent modular printheads. Each module can be serviced, replaced, or maintained independently, reducing overall maintenance complexity compared to a single large-array printhead with thousands of nozzles that would require systematic maintenance of the entire array.
Solution Approach 2:
The printhead assembly is configured to be movable relative to the media path, allowing the modular printheads to be repositioned or accessed for maintenance without moving the entire media system. This dynamic configuration simplifies maintenance operations.
3Productivity
If multiple printheads are used to span the media path, then printing speed and width coverage are improved, but ink delivery system complexity increases
Solution Approach 1:
Multiple printheads share a common ink supply system with a single ink reservoir that serves all printhead modules. This universal ink delivery approach reduces the complexity of having separate ink systems for each printhead while still supporting multi-color and high-speed printing requirements.
Solution Approach 2:
A bypass line with a bypass valve acts as an intermediary in the ink delivery system, providing an alternative flow path that can regulate ink distribution to multiple printheads. This mediator component simplifies the overall ink delivery architecture by centralizing flow control.
4Manufacturing precision
If printheads are positioned close to the media for high-resolution printing, then print quality is improved, but aerosol generation increases
Solution Approach 1:
A platen is introduced as an intermediary surface between the printheads and the media. The platen supports the media during printing, allowing optimized printhead positioning while reducing aerosol generation through improved ink transfer efficiency. The platen acts as a mediator that enables high-quality printing with reduced harmful emissions.
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 enables faster printing speeds, simplified maintenance, and effective aerosol management, improving print quality and reducing operational disruptions in wide format printing.
Implementation Method 1
a vacuum platen assembly configured for movement relative to the fixed printhead assembly
Data Source
AI summary
A printing system includes: an ink supply; a feed line coupled to the ink supply; a return line coupled to the ink supply; and a plurality of printhead modules each having an inlet port fluidically coupled to the feed line and an outlet port fluidically coupled to the return line; and bypass lines fluidically coupling the feed line to the return line. A bypass line is open for both priming and printing operations.