Patent ID: 7246883

Claim:
A printhead chip for an inkjet printhead, the printhead chip comprising: a substrate; and a plurality of nozzle arrangements positioned on the substrate, each nozzle arrangement comprising: a nozzle chamber structure that defines a nozzle chamber in which ink is received; an ink-ejecting member that is positioned in the nozzle chamber and is displaceable in the nozzle chamber to eject ink from the nozzle chamber; at least one actuator that is positioned on the substrate, the, or each, actuator having a working position that is displaceable with respect to the substrate when the actuator receives a drive signal; a sealing structure that is positioned on the substrate and is interposed between the, or each, actuator and the ink-ejecting member to inhibit a passage of ink between the ink-ejecting member and the actuator; and a motion transmitting structure that bridges the sealing structure, the motion transmitting structure comprising an effort formation that is connected to the working portion of the actuator, a load formation that is connected to the ink-ejecting member and a lever arm formation that interconnects the effort formation and the load formation, the lever arm formation being pivotal with respect to the nozzle chamber structure so that reciprocal movement of the working portion of the actuator is accommodated by pivotal movement of the lever arm formation with the result that the ink-ejecting member is reciprocally displaced towards and away from the ink ejection port.