Apparatus and techniques are disclosed for aligning the operation of the ink jet printhead cartridges of a multiple printhead ink jet swath printer that includes a print carriage that is movable along a horizontal carriage scan axis, (b) first and second ink jet printhead cartridges supported by the...http://www.google.de/patents/US6241334?utm_source=gb-gplus-sharePatent US6241334 - Automatic print cartridge alignment sensor system
