Patent ID: 7794032

Claim:
A liquid ejecting apparatus comprising: a liquid ejecting head that can eject liquid; a pressure pump that discharges pressurized air during operation; at least one liquid container that contains liquid; a pressurized-air feed channel that feeds the liquid container with the pressurized air discharged from the pressure pump; a liquid feed channel that feeds the liquid ejecting head with the liquid discharged from the liquid container in accordance with the pressure of the pressurized air that is fed to the liquid container through the pressurized-air feed channel; a hydraulic-pressure measuring device disposed in a no pressure region that is not under the pressure of the pressurized air, for measuring the pressure of the liquid fed from the liquid container to the liquid ejecting head; a determining section that determines a low liquid condition when the hydraulic-pressure measuring device detects a value lower than a threshold hydraulic pressure, predetermined as the lower limit of the hydraulic pressure necessary for feeding the liquid from the liquid container to the liquid ejecting head during the period from the start to the end of the operation of the pressure pump or immediately after the operation stops; and a controller that controls the operation of the pressure pump on the basis of the measurement of the hydraulic-pressure measuring device.