Patent ID: 7651184

Claim:
A liquid droplet ejecting apparatus comprising: a main tank mounting portion to which a main tank for storing liquid is removably mounted; a sub-tank which is connected to a main tank in a state where the main tank is mounted to the main tank mounting portion; an ejecting head including a passage which is connected to the sub-tank to guide the liquid delivered from the sub-tank to a nozzle and an ejecting pressure applying device which applies a feed pressure to the liquid inside the passage toward the nozzle to eject the liquid from the nozzle; a main tank detector which detects that the main tank is mounted to the main tank mounting portion; a suction pump which applies a negative pressure to an air layer inside the sub-tank to discharge air from inside the sub-tank to outside; and a controller configured to control the suction pump and the ejecting pressure applying device, based on information from the main tank detector; wherein the controller causes the suction pump to discharge the air from inside the sub-tank to outside and causes the ejecting pressure applying device to eject the liquid from the nozzle, when the main tank detector detects that the main tank is mounted to the main tank mounting portion.