An ink dispensing roll comprises a generally cylindrical member having a plurality of holes communicating with an interior annular reservoir and a microporous ink impregnated sleeve mounted about the cylindrical member. The annular reservoir is in liquid communication with a larger reservoir charged...http://www.google.com.au/patents/US4913050?utm_source=gb-gplus-sharePatent US4913050 - Self-metering gravity fed ink dispensing roller
