Inkjet Nozzle Detection via Frequency Segmentation
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Solution Overview
Problem
Continuous inkjet printers with multiple nozzles lack a reliable means to detect nozzle malfunction, such as blockages, which can disrupt printing quality and efficiency.
Innovation Solution
A method and device using distinct stimulation frequencies for each nozzle, with a charge signal detection mechanism that employs spectral components to differentiate and detect the presence of ink jets, allowing for individual nozzle testing and identification of malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple nozzles are used to increase printing speed, then productivity is improved, but the ability to detect individual nozzle malfunctions deteriorates due to signal crosstalk
Solution Approach 1:
The patent divides the detection system into independent channels by assigning a unique stimulation frequency to each nozzle. This segmentation allows the charge signal from each nozzle to be spectrally separated and detected independently, even when multiple nozzles operate simultaneously, thus enabling reliable malfunction detection while maintaining high printing speed with multiple nozzles.
Solution Approach 2:
The patent changes the frequency parameter of the stimulation signal for each nozzle to a distinct value. By varying the stimulation frequency parameter across different nozzles, the system creates spectrally distinguishable charge signals that can be individually analyzed, resolving the detection problem in multi-nozzle configurations while preserving productivity.
2Productivity
If multiple nozzles are stimulated simultaneously, then productivity is improved, but signal differentiation between nozzles becomes difficult
Solution Approach 1:
The patent applies different stimulation frequencies to each nozzle, creating a unique spectral signature for each nozzle's charge signal. This parameter differentiation allows precise measurement and identification of individual nozzle performance even when all nozzles are stimulated simultaneously, maintaining both productivity and measurement precision.
Solution Approach 2:
The patent uses vibrational frequencies in the electrical stimulation signals to create distinguishable patterns for each nozzle. By modulating the charge signals at different frequencies, the system enables precise differentiation of simultaneous signals from multiple nozzles through spectral analysis, resolving the measurement precision issue while maintaining simultaneous operation.
3Device complexity
If a single stimulation frequency is used for all nozzles, then device complexity is reduced, but the ability to identify individual nozzle issues is lost
Solution Approach 1:
The patent introduces frequency variation as an additional control parameter without significantly increasing device complexity. The stimulation system generates multiple frequencies using standard signal generation techniques, and the detection system uses spectral analysis to differentiate nozzles. This approach maintains relatively simple device architecture while enabling individual nozzle identification and monitoring.
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
Enables effective detection of nozzle malfunctions, ensuring print quality and allowing for timely cleaning or maintenance, thereby improving printing efficiency and reliability.
Implementation Method 1
said inkjet is produced or ejected by one of the nozzles, stimulated at a frequency fstim1, then charged at a frequency fTHT
Implementation Method 2
a charge signal, or a representative or image signal of the charge, of the jet is detected
Data Source
AI summary
The invention relates to a method for detecting the presence of a jet from a multi-jet print head of an inkjet printer comprising a plurality of nozzles (4), at least one 1st and one 2nd deviation electrode (14a, 14b) for each jet, in which: the inkjet is produced by one of the nozzles, at a frequency fstim1, and is then charged by a voltage VTHT at a frequency fTHT, fTHT not being an integer multiple or sub-multiple of fstim1; a jet charge signal is detected, derived from sampling, at frequency fstim1, of the voltage at frequency fTHT, at least one spectral component of this signal being used to detect the presence of the jet.