A method for cleaning nozzles in an ink jet printer includes the steps of: ejecting ink from a first plurality of the nozzles that are not frequently used in printing every first period; and ejecting ink from a second plurality of the nozzles which are frequently used in printing every second...http://www.google.de/patents/US5805182?utm_source=gb-gplus-sharePatent US5805182 - Method and apparatus for cleaning nozzles in an ink jet printer
