Overlapping Printheads With Air-Guided Aerosol Extraction
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Solution Overview
Problem
Existing printing units face challenges in optimizing aerosol extraction and airflow through the print zone, leading to suboptimal print quality, particularly in high PPS (printhead-paper-spacing) printing.
Innovation Solution
A printing unit design featuring elongate printheads with aerosol extractors positioned downstream and air guides projecting from the base plate to direct airflow unidirectionally parallel to the media feed direction, minimizing suction from lateral regions and ensuring uniform airflow across the print zones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If aerosol extractors are positioned downstream of the printhead, then aerosol extraction efficiency is improved, but airflow uniformity through the print zone deteriorates
Solution Approach 1:
Air guides are introduced as intermediary components between the printhead and aerosol extractor. These air guides direct airflow in a controlled manner, ensuring uniform air supply to the print zone while maintaining the downstream position of the aerosol extractor for efficient aerosol removal. The air guides act as mediators that reconcile the conflicting requirements of airflow uniformity and aerosol extraction efficiency.
Solution Approach 2:
The airflow path is segmented into distinct zones using air guides. The air guides create separate flow paths that direct air from the upstream region through the print zone to the aerosol extractor. This segmentation allows independent optimization of airflow distribution in the print zone and aerosol removal efficiency downstream.
2Manufacturing precision
If media feed alignment precision is increased, then printing quality is improved, but setup costs increase
Solution Approach 1:
The system uses the existing media feed alignment mechanisms to achieve proper positioning without requiring additional complex alignment procedures. The air guides and aerosol extractors are positioned relative to the printhead in a manner that leverages the existing media feed path geometry, allowing the system to self-align during normal operation rather than requiring costly manual setup.
3Speed
If printhead-paper-spacing is increased, then printing speed is improved, but print quality deteriorates
Solution Approach 1:
The system uses pneumatic principles by introducing controlled airflow through the print zone using air guides. This airflow helps maintain consistent contact between the printhead and media even at increased paper spacing, preventing quality degradation while allowing higher printing speeds. The pneumatic pressure distribution ensures uniform ink deposition across the print zone.
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 design achieves optimal airflow and aerosol extraction, improving print quality by reducing nozzle dehydration variations and minimizing keep-wet-spitting requirements, resulting in more uniform printing across the media feed path.
Implementation Method 1
an aerosol extractor positioned downstream of the printhead relative to a media feed direction, the aerosol extractor providing an airflow through a print zone associated with the printhead
Implementation Method 2
air guides projecting from a lower surface of the base plate towards the media feed path, wherein the air guides are positioned at opposite ends of the printhead and comprise respective guide walls for directing the airflow towards the aerosol extractor
Data Source
AI summary
A printing unit includes: a unit chassis for mounting over a media feed path; first and second elongate printheads mounted on the unit chassis and positioned in an overlapping arrangement across the media feed path; a first aerosol extractor positioned downstream of the first printhead relative to the media feed direction; and a second aerosol extractor positioned downstream of the second printhead and the first aerosol extractor relative to the media feed direction. The first and second aerosol extractors are positioned at a same distance from their respective first and second printheads.