A computer controlled ink jet printing system for printing messages in dot matrix format on objects such as cartons or the like as they move along conveyor lines past printing stations, and which includes one or more print head controls. The system further includes a plurality of print heads, at least...http://www.google.com/patents/US4608575?utm_source=gb-gplus-sharePatent US4608575 - Computer controlled multi-tasking ink jet printing system
