The present invention resides in a self-cleaning printer with a print head having an orifice plate defining an ink jet orifice, a cleaning orifice and a drain orifice. The orifice plate further defines an outer surface between the orifices. A source of pressurized cleaning fluid is connected to the cleaning...http://www.google.com.au/patents/US6513903?utm_source=gb-gplus-sharePatent US6513903 - Ink jet print head with capillary flow cleaning
