Patent ID: 7866792

Claim:
An ink jet printer, comprising: a transportation device that transports a print medium along a first direction within a predetermined plane; a first ink jet head having a first nozzle line, wherein the first nozzle line has a plurality of nozzles for discharging ink, and the nozzles of the first nozzle line are aligned along a direction which intersects with the first direction within the predetermined plane; a second ink jet head having a second nozzle line, wherein the second nozzle line has a plurality of nozzles for discharging ink, and the nozzles of the second nozzle line are aligned along a direction which intersects with the first direction within the predetermined plane; and a head moving device that moves the first ink jet head with respect to the second ink jet head along a direction which intersects with the first direction within the predetermined plane, between a first positional relationship and a second positional relationship, wherein in the first positional relationship, the first nozzle line and the second nozzle line overlap each other along a second direction which is perpendicular to the first direction within the predetermined plane, and each of the nozzles of the first nozzle line and of the second nozzle line are mutually offset along the second direction, and in the second positional relationship, the first nozzle line and the second nozzle line do not overlap along the second direction, in contrast to the first positional relationship.