| 摘要 |
PURPOSE:To obtain the titled system which utilizes a motor and the voltage dependence of a thermal head, can form a printing circuit which can all control the concentration of printing by means of digital circuits according to simple constitution and can sharply decrease the cost of the circuits. CONSTITUTION:When the synchronism of timing signals (a) generated from a timing generator 3, synchronizing with the revolution of a motor 2 and the conduction time [time obtained by subtracting the pulse width of printing inhibiting pulses (b) from a period of the timing signals (a)] of a thermal head 1 are shown using voltage as a parameter, difference between both is approximately constant. Thus, printing is fixed concentration is enabled because the conduction time necessery for the head 1 is obtained even when line voltage varies by constatly keeping the pulse width of the printing inhibiting pulses (b). |
