| 摘要 |
PROBLEM TO BE SOLVED: To enhance printing speed without sacrifice of print accuracy by arranging a plurality of print heads in the printing direction while shifting each print head sequentially in the printing direction by an amount corresponding to a plurality of intervals of ink nozzle thereby constituting a set of ink jet heads. SOLUTION: A print head 1 comprises a large number of ink nozzles 5 opening linearly in the print window thereof wherein a plurality of print heads, e.g. three print heads 1a-1c, are arranged in the printing direction as a set of an ink jet head A. The print heads 1a-1c are shifted sequentially by one third of the interval L of the ink nozzle 5 in the print width direction. Since a print 3 of the ink jet head A has a dot pitch L2 equal to L1 /3 and the dot pitch in the print width direction is denser as compared with a single print head 1, print accuracy can be enhanced in the print width direction. |
