This patent describes an ink jet printer based around ink jet nozzles which utilize a pump action so as to rapidly refill a nozzle chamber for ejection of subsequent ink drops. The nozzle chamber includes a first actuator for ejecting ink and a second actuator for pumping ink into the nozzle chamber....http://www.google.fr/patents/US6416168?utm_source=gb-gplus-shareBrevet US6416168 - Pump action refill ink jet printing mechanism
