Head Drive Device Jetting Frequency Control for Droplet Velocity Stability
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Solution Overview
Problem
Existing ink jet printing technologies face challenges in maintaining continuous jetting stability and efficient droplet ejection due to excessive acceleration of subsequent liquid droplets relative to preceding ones, leading to instability and reduced productivity in single-pass type printing machines.
Innovation Solution
A head drive device that acquires and generates a drive waveform with jetting frequencies set based on drop velocity information, ensuring that the subsequent droplet is not accelerated relative to the preceding droplet by adjusting the jetting frequency within specific bands, thereby stabilizing continuous jetting and optimizing droplet ejection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a pulse or pulse group within the one-pixel cycle is connected such that the jetting head and the liquid resonate, then efficient liquid droplet jetting is achieved, but the subsequent liquid droplet is excessively accelerated with respect to the preceding liquid droplet, impairing the stability of continuous liquid droplet jetting
Solution Approach 1:
The patent changes the drive waveform parameters by introducing a cancel pulse with specific polarity, width, and timing relative to the jetting pulse. This parameter adjustment suppresses the excessive acceleration of subsequent liquid droplets while maintaining efficient jetting through resonance, thereby resolving the contradiction between productivity and jetting stability.
Solution Approach 2:
The cancel pulse is applied in advance before the subsequent jetting pulse to counteract the residual vibration and excessive acceleration from the preceding droplet ejection. This preliminary anti-action prepares the system for stable subsequent droplet jetting by eliminating the harmful effects of previous pulses, thus maintaining both efficiency and stability.
2Productivity
If the jetting frequency is increased to shorten the pixel cycle, then productivity is improved, but the stability of continuous jetting is compromised due to excessive acceleration of subsequent droplets
Solution Approach 1:
The patent employs periodic cancel pulses at specific intervals within the pixel cycle to continuously suppress excessive droplet acceleration. This periodic intervention allows maintaining high jetting frequency for productivity while ensuring stable continuous jetting through regular correction of vibration effects.
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
This approach ensures both continuous jetting stability and efficient droplet ejection, enhancing the productivity of single-pass type ink jet printing machines by maintaining consistent droplet velocities and reducing jetting abnormalities.
Implementation Method 1
a drive method of applying resonance between a jetting head and a liquid is effective
Data Source
AI summary
A drive waveform acquisition unit that acquires a drive waveform, a drive voltage generation unit that generates the drive voltage, a jetting frequency setting unit that sets a jetting frequency on the basis of drop velocity information representing a relationship between the jetting frequency and a drop velocity in a single-shot, and a drive voltage supply unit that supplies the drive voltage to the jetting head are included. The jetting frequency setting unit sets a jetting frequency at which the drop velocity is a second velocity equal to or less than a first velocity in the drop velocity information as the jetting frequency of the jetting head.