Parallel-Substrate Inkjet Printing With Misalignment Detection
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Solution Overview
Problem
Large format media printers often misposition or misalign print substrates during loading, leading to incorrect printing and waste, which existing technologies fail to address effectively.
Innovation Solution
A method and printer system that determines the orientation, dimension, and position of each print substrate before printing, allowing only correctly aligned substrates to be printed while preventing printing on misaligned ones, thereby reducing waste and maintaining productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If printing continues on misaligned substrates, then productivity is maintained, but printing quality deteriorates and waste increases
Solution Approach 1:
The system performs alignment detection and evaluation before the printing operation. The detection unit measures substrate position and orientation in advance, and the control unit determines whether alignment is within acceptable tolerances before initiating printing, preventing misaligned printing from occurring in the first place
Solution Approach 2:
The system implements a feedback loop where alignment detection results are fed back to the control unit, which then makes real-time decisions about whether to proceed with printing. This closed-loop control ensures that only properly aligned substrates are printed, maintaining precision without sacrificing productivity
2Manufacturing precision
If printing is stopped to correct misaligned substrates, then print quality is maintained, but productivity decreases
Solution Approach 1:
The system extracts or removes misaligned substrates from the printing process by identifying them through detection and preventing printing on them. This allows the printing process to continue uninterrupted on properly aligned substrates while isolating and setting aside only the problematic substrates for later correction
Solution Approach 2:
The printing process maintains continuous operation on correctly aligned substrates without interruption. By detecting and filtering out only misaligned substrates, the system ensures that the useful printing action continues uninterrupted, maximizing productivity while maintaining quality
3Manufacturing precision
If misaligned substrates are discarded and re-printed, then print quality is ensured, but material waste increases and time is lost
Solution Approach 1:
Instead of discarding misaligned substrates, the system recovers them by identifying through detection and setting aside for later repositioning and re-printing. This approach allows substrates to be reused rather than wasted, reducing material loss while still ensuring print quality
4Manufacturing precision
If alignment detection and prevention systems are added, then print quality improves, but device complexity increases
Solution Approach 1:
The system replaces complex mechanical alignment adjustment mechanisms with an automated detection and control system. Instead of requiring manual or mechanical intervention to align substrates, optical or sensor-based detection units automatically measure alignment and the control unit manages the printing decision, simplifying the overall system architecture
Data Source
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AI summary
To maintain high productivity and to reduce waste in a wide format printer, a method is provided, which comprises the steps of: - conveying a plurality of print substrates (M1-M14) in parallel past a printing assembly (7) in a transport direction (X), characterized by the steps of: - determining an orientation, position, and/or dimension of each substrate (M1-M14) with respect to a respective reference, - preventing printing on those (M2) of the parallel print substrates (M1-M14) of which the orientation, position, and/or dimension has been determined to substantially deviate from the respective reference as they pass the printing assembly (7).