| 摘要 |
PROBLEM TO BE SOLVED: To ensure the print of an equal quality to the print obtained at a clogging-free normal printing time by previously detecting a clogging in the nozzle of a printing head and scanning crosswise with the printing head through operating only a usable nozzle group and at the same time, feeding sheets lengthwise by feed width equal to the longitudinal width of the nozzle group and performing the printing process. SOLUTION: When a clogging detection means 2 detects a clogging in either of nozzles, a means 3 for deciding a nozzle to be used decides a clogging-free usable nozzle group from among nozzle arrays based on the detection results recorded in a head information recording means 6. Further, a sheet feed width decision means 4 calculates the feed width of the sheet based on nozzle information recorded in the head information recording means 6, and performs a main scanning of data with a printing head so as to print output data generated by a data generation means 5, while using the usable nozzle group alone. At the same time, the means 4 feeds the sheet longitudinally only by the calculated feed width of the sheet to carry out the printing process. |
