Patent ID: 7661811

Claim:
An ink jet printer comprising: a printing medium conveying section for conveying a printing medium, the printing medium conveying section including: a first conveying belt; and a second conveying belt kept at a predetermined interval from the first conveying belt; a discharge performance recovery section for recovering ink discharge performance of nozzles of a printing head, the discharge performance recovery section including: a first discharge performance recovery section between the first conveying belt and the second conveying belt; and a second discharge performance recovery section adjacent to the first discharge performance recovery section and sandwiching the second conveying belt therebetween; and the printing head which includes first, second, third and fourth nozzle groups, and in a first position, the first nozzle group faces the first conveying belt, the second nozzle group faces the first discharge performance recovery section, the third nozzle group faces the second conveying belt, and the fourth nozzle group faces the second discharge performance recovery section, wherein the discharge performance recovery section is configured to: move the printing head to the first position to recover ink discharge performance of the second nozzle group and the fourth nozzle group; move the printing head in a direction intersecting a conveying direction of the printing medium from the first position to a second position where the first nozzle group faces the first discharge performance recovery section and the third nozzle group faces the second discharge performance recovery section; and recover ink discharge performances of the first nozzle group and the third nozzle group in the second position.