Nozzle arrangement for an ink jet printhead including volume-reducing actuators

An ink jet printhead which comprises

• a substrate;
• a plurality of nozzle arrangements positioned on the substrate, each nozzle arrangement comprising
• a roof wall, floor and side walls that define a nozzle chamber;
• and
• an actuator that is arranged on the substrate for facilitating the ejection of ink from the nozzle chamber of the nozzle arrangement, the actuator comprising
• at least one actuating member that is mounted on the substrate and is operatively positioned with respect to the nozzle chamber to define at least part of one of the roof wall, floor and side walls of the nozzle chamber, the, or each, actuating member being displaceable between an inoperative condition and an operative condition to reduce a volume of the nozzle chamber so that ink is ejected from the nozzle chamber;
• and
• an actuating mechanism for displacing the, or each, actuating member between the inoperative and operative conditions.