Patent ID: 7427127

Claim:
A head cartridge, comprising: a liquid-ejecting head for ejecting a predetermined liquid from liquid-ejecting nozzles formed in a nozzle plate of the liquid-ejecting head, the liquid-ejecting head having a liquid chamber comprising a liquid inlet and at least two liquid outlets; a liquid-supplying conduit for supplying the liquid from a single liquid tank to the liquid chamber in the liquid-ejecting head; a valve unit including a valve and disposed on the liquid-supplying conduit; a liquid-refluxing conduit for refluxing the liquid received from the liquid-ejecting head through the at least two liquid outlets to the liquid tank; and a liquid-circulating unit disposed only on the liquid-refluxing conduit and circulating the liquid between the liquid-ejecting head and the liquid tank, wherein, the liquid-circulating unit is driven to generate a negative pressure inside the liquid-ejecting head to circulate the liquid between the liquid-ejecting head and the liquid tank, and the valve unit supplies the liquid from the liquid tank to the liquid-ejecting head by opening the valve when a negative pressure is generated in the liquid-ejecting head.