Liquid ejection device

A liquid ejection device comprising:

• an ejector configured to eject a liquid in a continuous flow, form the continuous flow into droplets, and cause a collision with an object in a form of the droplets;
• a liquid feeder;
• a liquid channel coupling the ejector and the liquid feeder;
• and
• a controller, wherein
• the liquid feeder includes
• a liquid reservoir having a liquid reservoir chamber coupled to the liquid channel and configured to reserve the liquid,
• a displacement part dividing the liquid reservoir into the liquid reservoir chamber, a first pressure chamber, and a second pressure chamber and displaced relative to the liquid reservoir to change a volume of the liquid reservoir chamber, a volume of the first pressure chamber, and a volume of the second pressure chamber, and
• a drive unit displacing the displacement part relative to the liquid reservoir,
• the displacement part is placed to increase the volume of the liquid reservoir chamber when displaced to increase the volume of the first pressure chamber relative to the volume of the liquid reservoir, and decrease the volume of the liquid reservoir chamber when displaced to increase the volume of the second pressure chamber relative to the volume of the liquid reservoir,
• the controller controls the drive unit to displace the displacement part to increase the volume of the first pressure chamber at a suction operation of suctioning the liquid into the liquid reservoir chamber, and controls the drive unit to displace the displacement part to increase the volume of the second pressure chamber at an ejection operation of ejecting the liquid from the ejector, and
• the drive unit has a coil spring disposed inside at least one of the first pressure chamber or the second pressure chamber and displaces the displacement part relative to the liquid reservoir by an elastic force of the coil spring.