Patent ID: 8070256
Filing Date: 2011-12-06
Classification: B41J

Abstract:
1. An ink jet printer, comprising: an ink jet head comprising a first black nozzle column including a plurality of nozzles, a second black nozzle column including a plurality of nozzles and a color nozzle column including a plurality of nozzles; and a carriage that equips with the ink jet head, the carriage moving from a first side to a second side and from the second side to the first side; wherein the first black nozzle column discharges the black ink while the carriage is moving from the first side to the second side and does not discharge the black ink while the carriage is moving from the second side to the first side; wherein the second black nozzle column discharges the black ink while the carriage is moving from the first side to the second side and does not discharge the black ink while the carriage is moving from the second side to the first side; and wherein the single color nozzle column discharges the different colors of ink while the carriage is moving from the first side to the second side and from the second side to the first side.