| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that it is impossible to continue a printing work without replacing the main tank when a main tank is at an end status. SOLUTION: When the ink use-up urgent printing is selected, pressure inside the sub-tank 35 is detected, and when the pressure inside the sub-tank 35 is not within a normal range to allow the recording head 34 to eject liquid droplets, whether the ejected amount of ink is equal to or larger than a predetermined threshold is determined, if the ejected amount of ink is smaller than the predetermined threshold, the air introducing mechanism 207 of the sub-tank 35 is opened and introduces outside air to the sub-tank 35 to thereby raise the pressure inside the sub-tank 35, and the air introducing mechanism 207 is then closed, thereafter, the pressure inside the sub-tank 35 is reduced by causing the recording head 34 to carry out non-image forming liquid droplet ejection, the pressure inside the sub-tank 35 becomes within the normal range, thereafter, printing operation is carried out. COPYRIGHT: (C)2011,JPO&INPIT |
