Duplexed redundant print engines

摘要

A print engine for a printer includes a first printhead and a second printhead. Both printheads include a plurality of inkjet nozzles. The printheads are matched so that defective nozzles in one printhead are substituted by corresponding, non-defective nozzles in the other printhead. The print engine includes a transfer roller displaceable into and out of abutment with the printheads for inhibiting evaporation of ink from the printheads when no printing is occurring.