An ink jet printer includes a print head having a plurality of piezoelectric driving elements selectively energizable to cause ejection of droplets of ink through nozzles in a nozzle plate. Ink is supplied to the print head from an ink reservoir which is connected to a bellows device. The ink reservoir...http://www.google.com.au/patents/US4412232?utm_source=gb-gplus-sharePatent US4412232 - Ink jet printer
