Inkjet Recording Apparatus Phase Detection Charging Timing
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Solution Overview
Problem
Conventional inkjet recording apparatuses struggle to maintain optimal charging timing for continuous printing on long products like cables, hoses, and pipes, leading to print disorders due to changes in ink viscosity and temperature, and are unable to apply phase detection charging signals effectively during infinite printing.
Innovation Solution
An inkjet recording apparatus that continuously detects the optimum charging timing by using a phase detection charging signal, even during non-printing periods, and applies it to ink particles for character width adjustment to ensure accurate printing on long products by shifting the particulation cycle phase and comparing charged voltages to a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the particulation cycle phase is shifted to detect optimum charging timing during non-printing periods, then charging timing accuracy is improved, but printing speed deteriorates due to time consumption for detection
Solution Approach 1:
The system performs phase detection charging during non-printing periods before actual printing begins, allowing the optimum charging timing to be detected and stored in advance. This preliminary detection ensures that when printing starts, the system already has the optimized charging parameters ready, eliminating the need to slow down printing to perform detection.
Solution Approach 2:
The system continuously updates the optimum charging phase by accumulating charged amount information from successive phase detection charging operations. Even during non-printing periods, the system maintains continuous monitoring and adjustment of charging timing, ensuring that the printing system always operates with current optimal parameters without interrupting the printing flow.
2Measurement precision
If phase detection charging is performed during non-printing periods, then charging timing is optimized, but the non-printing period duration increases
Solution Approach 1:
The system performs phase detection charging with excessive action by conducting multiple phase detection operations during the non-printing period to ensure accurate detection of the optimum charging phase. Although this consumes more time than a single detection would require, it guarantees robust detection under varying conditions such as temperature and ink viscosity changes.
3Productivity
If printing is performed continuously on long products without non-printing periods, then productivity is improved, but the ability to detect and adjust optimum charging timing is lost
Solution Approach 1:
The system implements periodic phase detection charging at predetermined intervals during continuous printing operations. This periodic action allows the system to maintain continuous productivity while still periodically updating the optimum charging timing to adapt to changes in ink properties, temperature, and other environmental factors that may occur during extended printing runs.
Solution Approach 2:
The system uses feedback from charged amount detection during periodic phase detection charging to continuously adjust and update the optimum charging phase. The detected charged amount information is fed back to modify the charging timing, ensuring that the system adapts to changing conditions while maintaining continuous printing operations without complete non-printing periods.
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 allows for continuous, high-quality printing on long products without print disorders by constantly adjusting the charging timing, ensuring the inkjet recording apparatus maintains optimal charging conditions, even during infinite printing scenarios.
Implementation Method 1
a charging electrode to apply two kinds of charging signals to the ink particles
Implementation Method 2
An inkjet recording apparatus is configured to print by subjecting an ink injected from a nozzle to particulation at a constant cycle
Data Source
Figure 1
Figure 2A(a)~2B(b)
Figure 2C
AI summary
An inkjet recording apparatus includes an ink particle generation unit that makes a pressurized ink injected from a nozzle into particles, a charging unit that electrically charges the ink particle of those subjected to particulation, which corresponds to a dot to be printed, a polarizing unit that polarizes the electrically charged ink particle in a polarizing electric field, a collection unit that allows a gutter to collect the ink particle corresponding to the dot that is not printed, and a character forming unit that forms a character as a dot matrix on a printing object. A phase detection charging signal is applied to the ink particle that is not used for printing when forming the dot matrix character so as to detect an optimum charging timing in a process of forming the dot matrix character.