Ink Circulation Control Device for Pressure Fluctuation Suppression
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Solution Overview
Problem
Ink jet printing devices face challenges in suppressing pressure fluctuations of ink circulating in the ink jet head, particularly due to differences in control parameters between non-printing and printing states, leading to inadequate suppression of pressure fluctuations during printing.
Innovation Solution
A control device for an ink circulation system that includes upstream and downstream pumps, pressure sensors, and a processor to apply a pressure difference and perform PID control. The processor switches PID control parameters between jetting and non-jetting states, ensuring proportional, integral, and differential gains are adjusted accordingly to maintain target pressure values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single set of PID control parameters is used for both non-printing and printing states, then the control system is simple, but the pressure fluctuations cannot be suppressed effectively in both states
Solution Approach 1:
The patent applies dynamics by making the PID control parameters variable rather than fixed. The control device dynamically switches between a first set of parameters for non-printing states and a second set of parameters for printing states, allowing the system to adapt to different operational conditions and effectively suppress pressure fluctuations in both scenarios.
Solution Approach 2:
The patent implements parameter changes by establishing different PID control parameter sets corresponding to different operation states. The control device determines the current state (printing or non-printing) and selects appropriate parameters, thereby optimizing pressure control for each specific operational condition.
2Reliability
If PID control parameters are optimized for non-printing state, then pressure fluctuation during non-printing is suppressed, but pressure fluctuation during printing increases and causes dot diameter variation
Solution Approach 1:
The system dynamically adapts its control behavior based on the operational state. During non-printing, one parameter set maintains pressure stability, while during printing, another parameter set is activated to suppress pressure fluctuations that would otherwise cause dot diameter variation, thus maintaining manufacturing precision.
Solution Approach 2:
The patent changes control parameters according to the operational state. When printing is detected, the control device switches to a second parameter set that is optimized for printing conditions, preventing pressure fluctuations from affecting dot diameter consistency, while using a first parameter set during non-printing for general pressure stability.
3Manufacturing precision
If PID control parameters are optimized for printing state, then pressure fluctuation during printing is suppressed, but pressure fluctuation during non-printing increases causing ink stagnation
Solution Approach 1:
The control system dynamically adjusts its parameters based on whether the ink jet head is in printing or non-printing state. This dynamic adaptation ensures that during printing, pressure fluctuations are suppressed for consistent dot diameter, while during non-printing, appropriate parameters prevent ink stagnation and maintain circulation stability.
Solution Approach 2:
The patent implements state-dependent parameter changes where a first parameter set is used for non-printing states to maintain ink circulation stability, and a second parameter set is used for printing states to suppress pressure fluctuations and maintain manufacturing precision.
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
The solution effectively suppresses pressure fluctuations of the ink circulating in the ink jet head regardless of the operation state, thereby maintaining consistent dot diameter and improving image quality.
Implementation Method 1
circulates the ink to the ink jet head by applying a pressure difference between an upstream side and a downstream side of the ink jet head by the upstream side pump and the downstream side pump
Implementation Method 2
an upstream side pressure sensor that measures a pressure in the upstream side flow passage, a downstream side pressure sensor that measures a pressure in the downstream side flow passage
Data Source
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AI summary
Provided are a control device of an ink circulation device, a control method of an ink circulation device, a program, and a printing device that suppress a pressure fluctuation of an ink circulating in an ink jet head regardless of an operation state. Parameters of a PID control of an upstream side pump that supplies an ink stored in an ink tank to an ink jet head are switched between a jetting state in which the ink is jetted from the ink jet head and a non-jetting state different from the jetting state, and in a case in which, in the upstream side pump in the non-jetting state, proportional gain is denoted by Kp1_in, integral gain is denoted by Ki1_in, and differential gain is denoted by Kd1_in, and, in the upstream side pump in the jetting state, proportional gain is denoted by Kp2_in, integral gain is denoted by Ki2_in, and differential gain is denoted by Kd2_in, relationships of Kpl in < Kp2_in, Ki1_in > Ki2_in, and Kd1_in < Kd2_in are satisfied.