Patent ID: 7585047

Claim:
A nozzle arrangement for a pagewidth inkjet printhead assembly, the nozzle arrangement comprising: a substrate that defines an ink supply channel; walls defining an ink chamber in fluid communication with the ink supply channel and an ink ejection port in fluid communication with the fluid chamber and having an ink spreading prevention rim; a thermal actuator mechanism arranged in the substrate and configured to eject ink from the chamber via the ejection port, the mechanism having a thermal actuator arm capable of deflection as a result of relative thermal expansion; and control logic architecture on the substrate for controlling the thermal actuator arm, the architecture having a number of successive shift registers each having a data input and a data output, a transfer register arranged to receive the data output from a last shift register, and a firing control gate having an enabling input and a gate data input receiving an output from the transfer register, the gate operatively driving the thermal actuator according to the enabling and gate data inputs.