A printing data processing apparatus for performing printing operations on an object to be printed is provided, which includes a plurality of printhead modules arranged in parallel, wherein each of the printhead modules has equal number of parallel printheads, each of the printheads has at least one...http://www.google.com.au/patents/US7637578?utm_source=gb-gplus-sharePatent US7637578 - Printing data processing apparatus and method therefor
