A nozzle cleaning device for an ink jet printer containing a plurality of ink reservoirs, the cleaning device including a pressure source and a valve mechanism for selectively coupling the pressure source to the ink reservoirs, wherein the valve mechanism comprises a valve housing, and a piston movable...http://www.google.ca/patents/US7261391?utm_source=gb-gplus-sharePatent US7261391 - Nozzle cleaning device for an ink jet printer
