Multi-Printhead Substrate Segmentation for High-Speed Inkjet Printing
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Solution Overview
Problem
Inkjet printing technologies face limitations in increasing print speed while maintaining quality and cost-effectiveness, particularly due to constraints on swath height, scanning rate, overtravel, and interlacing, which result in suboptimal print speeds and quality, especially in large format and high-resolution printing.
Innovation Solution
The method involves subdividing the substrate into multiple regions, each printed by dedicated printheads or printhead arrays, using novel print algorithms to hide errors and reduce interlacing, enabling simultaneous double-sided printing and improving print speed without significant cost increases by employing existing components and minimizing manufacturing tooling costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If scanning head inkjet systems increase swath height or scanning rate to improve print speed, then productivity increases, but manufacturing precision and print quality deteriorate due to paper flatness issues and mechanical limitations
Solution Approach 1:
The patent divides the substrate into multiple disjoint regions and assigns different printheads or printhead arrays to print each region simultaneously. This segmentation allows parallel printing operations without requiring increased swath height or scanning rate, thus maintaining print quality while improving overall productivity through concurrent processing of multiple regions.
2Manufacturing precision
If interlacing is increased to maintain image quality, then manufacturing precision improves, but productivity decreases due to multiple scan interruptions
Solution Approach 1:
By segmenting the substrate into multiple regions printed by different printheads simultaneously, the patent eliminates the need for interlacing within each region. Each printhead prints its assigned region in a single continuous scan without interruptions, maintaining image quality while dramatically improving print speed through parallel processing.
Solution Approach 2:
The patent enables continuous printing action by assigning dedicated printheads to specific regions, eliminating the scan interruptions required for interlacing. Each printhead operates continuously across its assigned region without needing to interrupt and reposition, maintaining manufacturing precision while maximizing productivity.
3Productivity
If multiple printheads are used to increase print speed, then productivity improves, but device complexity increases
Solution Approach 1:
The patent segments the printing task across multiple printheads, each handling a specific substrate region. This segmentation strategy improves productivity through parallel processing while managing device complexity by organizing printheads in a modular architecture where each unit operates independently on its assigned region.
Solution Approach 2:
The patent employs multiple printheads that can be configured to print different regions of the substrate, providing multi-functionality. Each printhead serves multiple purposes: printing its assigned region, potentially serving as a backup for other regions, and enabling flexible substrate size accommodation, thus improving productivity without proportionally increasing complexity.
Data Source
AI summary
A method and apparatus for subdividing and printing regions of a substrate with multiple print heads or multiple print head assemblies which substantially decreases printing time is described. The method includes a feathering method which reduces overlap artifacts which is useful in any printing situation where adjacent regions are printed that could be misaligned, offset, or have slightly different colors.