PURPOSE: To stably feed an ink sheet without requiring a complicated structure.
CONSTITUTION: A CPU 20 controls the driving of a grid motor 6 so that recording paper 9 can be fed at constant speed in such a state that an ink sheet 8 and the recording paper 9 are brought to a pressure contact state by a thermal head 3 and a platen 7. The CPU 20 drives an ink motor 1 by arbitrarily set voltage Vi1 and measures the value Vg1 of the current flowing to the grid motor 6 at this time. The CPU 20 calculates the optimum driving voltage Vir of the ink motor l on the basis of the measured current value Vg1 so as to generate predetermined tension in the ink sheet at the time of printing and the ink motor 1 is driven by the voltage Vir. By this constitution, since the characteristic of a printing drive system is detected by measuring the value Vg of the current flowing to the grid motor, the printing drive system can be controlled by simple constitution.
ISHII HIROSHI
HANATO HIROYUKI
