Patent ID: 7988267

Claim:
An ink jet printer comprising: a recording head for discharging a plurality of inks from a plurality of nozzles to print on a recording medium; a tank having a plurality of storage chambers for respectively storing the plurality of inks to be supplied to the recording head; a plurality of air discharge passages for discharging air in the plurality of storage chambers respectively to outside; a plurality of air discharge valves provided respectively in the air discharge passages so as to be opened and closed; and an open/close unit provided outside the tank for opening and closing the air discharge valves; wherein the first air discharge valve of the plurality of air discharge valves and the open/close unit are located in such a positional relationship that the first air discharge valve is opened and closed at a timing which is delayed with respect to the second air discharge valve of the plurality of air discharge valves; wherein the open/close unit has a plurality of air discharge rods for opening and closing the plurality of air discharge valves correspondingly, further comprising: an actuator for driving the air discharge rods simultaneously; and wherein one or more of the air discharge rods of the plurality of air discharge rods are different in length from the other air discharge rod(s).