Abstract: A printer housing assembly provides dual in-line cartridges separated by a pre-set distance. Drive belts are used to pass documents such as checks at a high rate of speed past the nozzles of the dual cartridges. A delayed firing mechanism is provided between the two cartridges so that each cartridge will print exactly the same marking on the same spot of each document as it passes by. Further enhancements and contrast quality can also be developed by use of multiple cartridges more than just two cartridges which are placed in a specialized phased relationship to develop “dot-on-dot” printing of the same target by each individual cartridge.

Abstract: A document-endorse arrangement has a document transport mechanism wherein documents are advanced down a track past one or more print stations where a jet-print nozzle array projects an ink stream to the document. One or more angled air streams arise from the track. Each air stream is directed downstream of the track at an acute angle of approximately 20 degrees with respect to the track. At least one of the airstreams is upstream of the nozzles and is adapted to pneumatically float each document past the nozzles so as to maintain a prescribed gap between the document and both the track and nozzles. This inhibits contamination of the nozzle from surplus ink and dust.