| 摘要 |
PURPOSE:To align printed characters on one straight line while aligning impact timings of all hammers, by a method wherein elements each for detecting the impact timing of each hammer are provided on a type drum and the flight time of the hammer is regulated. CONSTITUTION:Piezoelectric elements 7 each corresponding to one line are embedded in the type drum of a type line printer corresponding to each figure to fabricate a maintenance command. The operation of the maintenance command prints the part of the piezoelectric element 7 at every one figure and repeated to the max. numbers of figures of the apparatus. When a magnet is excited at every each figure by this operation, the count-up of a counter 10 is started by the signal from a control circuit 13 and, when the piezoelectric element 7 of the type drum 1 is struck by a hammer 5, the counter 10 is stopped through rotary shaft and a brush 9. The difference of the value of the counter 10 at this time and a reference flight time value is taken by difference circuit 11 and an exciting drive power source 6 is driven by timing shifted corresponding to the difference value thereof. |
