Patent ID: 7997686

Claim:
A nozzle arrangement for an inkjet printhead, the nozzle arrangement comprising: a wafer substrate defining an inlet channel; a nozzle chamber wall and a roof wall positioned on the wafer substrate to define a nozzle chamber in fluid communication with the inlet channel, the roof wall defining an ink ejection port in fluid communication with the nozzle chamber; a paddle positioned in the nozzle chamber and reciprocally displaceable to eject ink from the ejection port; and an actuating arm extending through the nozzle chamber wall and connected to the paddle, the actuating arm comprising an actuating portion having a pair of actuating members, one of the actuating members including a heating circuit, wherein on receipt of an electrical signal to the exclusion of the other actuating member, the actuating arm is displaced in a first direction, and further wherein the actuating arm is comprised of a resiliently flexible material, whereby on cessation of the electrical signal, the actuating arm is displaced in a second direction opposite to the first direction.