LIQUID CIRCULATION DEVICE, LIQUID DISCHARGE DEVICE AND CONTROL METHOD OF THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a liquid circulation device capable of securing high liquid discharge performance, and further to provide a liquid discharge device and a control method of the liquid discharge device.SOLUTION: A liquid circulation device comprises: a liquid chamber; a circulation section; a liquid replenishment section; a gas control section; and a control section. The liquid chamber is connected to a liquid discharge section discharging liquid and constituted so as to be able to hold the liquid. The circulation section circulates the liquid through a flow passage including the liquid chamber and the liquid discharge section. The liquid replenishment section replenishes the liquid chamber with the liquid. The gas control section is constituted so as to be able to pressurize or depressurize the liquid chamber. The control section replenishes the liquid chamber with the liquid by the liquid replenishment section when a pressure of the liquid discharge section is within a predetermined reference range and less than a predetermined threshold value, pressurizes the liquid discharge section by pressurizing the liquid chamber by the gas control section when the pressure is less than the reference range, and depressurizes the liquid discharge section by depressurizing the liquid chamber by the gas control section when the pressure is greater than the reference range.SELECTED DRAWING: Figure 13