JPS6431652A - Printing of dot line printer - Google Patents

Abstract

PURPOSE:To achieve reduction of consumption power of all hammer banks, by a method wherein in the case of high density printing, hammer coils are divided into odd number ones and even number ones, the odd number ones and the even number ones are further respectively divided into two groups, and they are combined to be printed. CONSTITUTION:By shuttles on the first time and the second time 24 pieces of odd release coils 4 of No. 1, 5, 9...93 of upper and lower hammer banks 2 are respectively excited, and after a hammer bank 3 has moved by half dot, 24 pieces of even release coils 4 of No. 2, 6,...94 of upper and lower hammer banks 1 are respectively excited. By the shuttles on the third time and the fourth time remaining 24 pieces of odd release coils 4 of No. 3, 7,...95 of the upper and lower hammer banks 2 are respectively excited, and after the hammer bank 3 has moved by half dot, remaining 24 pieces of even release coils 4 of No. 4, 8,...96 of the upper and lower hammer banks 1 are respectively excited. By this method the number of release coils 4 excited at the same time is 24: a half of 48 that is the number by a conventional method. Then, influence by magnetic interference decreases and reduction of exciting current is achieved. Therefore, power consumption of the all hammer banks 3 can be reduced.