An ink-jet recording apparatus applies a pressure, which is higher than atmospheric pressure, to an ink supply. A recording head includes a nozzle for jetting ink droplets. A valve is disposed between the pressurized ink supply and the nozzle in order to control the ink flow to the nozzle. The valve...http://www.google.com.au/patents/US4628330?utm_source=gb-gplus-sharePatent US4628330 - Ink-jet recording apparatus
