Patent ID: 7018026

Claim:
An ink-jet printhead comprising: a main frame; a head unit fixed to the main frame, the head unit including: a plurality of nozzles from which ink is ejected; a plurality of pressure chambers each provided for a corresponding one of the plurality of nozzles; a common ink chamber that distributes the ink to the plurality of pressure chambers; an actuator that selectively applies ejection energy to the ink in the plurality of pressure chambers; an ink supply port connected to the common ink chamber; and a cylindrical member having a hollow and attached to the ink supply port; a coupling member having an ink supply passage; and an elastic tube connecting the coupling member to the cylindrical member; wherein the main frame is provided with a through-hole toward which the cylindrical member is projecting, and the coupling member is fixed to the main frame on a side opposite from the head unit such that the ink supply passage of the coupling member partially forms an ink path passing from an ink source, through the through-hole, to the hollow of the cylindrical member and such that when the ink source is not connected to the coupling member the coupling member remains fixed to the main frame.