| 摘要 |
<p>A dot type printing head for use in a serial printer comprising dot-forming means (12,13) for forming 2N rows of dots (P1-P12; P13-P24; P25-P36; P37-P48) where N is a positive integer of 2 pr more, each row of dots being spaced from an adjacent row by a substantially fixed interval (23) in the carriage moving direction (X) of the printer and being shifted with respect to the adjacent row in the paper feeding direction (Y) of the printer, the dots in each row being arranged at substantially N dot pitches in the paper feeding direction (Y); and driving means (6,10,14,16; 7,11,15,17) for driving the dot-forming means (12,13) characterised in that the driving means (6,10,14,16; 7,11,15,17) effect printing of various rows of dots (P1-P12; P13-P24; P25-P36; P37-P48) at different timings, each row of dots (P13-P24, P37-P48 in Figures 2 and 4; D,E,F in Figure 5) which is printed at an even numbered timing being given a predetermined shift of not more than 1/3 dot in the paper feeding direction (Y) with respect to a selected previous row of dots (P1-P12, P25-P36 in Figures 2 and 4; A,B,C in Figure 5) in the carriage moving direction (X) which is printed at an odd numbered timing; successive rows of dots (P1-P12, P25-P36 in Figures 2 and 4; A,B,C in Figure 5) which are printed at the odd numbered timings, and successive rows of dots (P13-P24, P37-P48 in Figures 2 and 4; D,E,F in Figure 5) which are printed at the even numbered timings being relatively shifted in the paper feeding direction (Y) by one dot.</p> |
