| 摘要 |
<p>PURPOSE:To suppress the generation of printing blur at the time of the change of applied history by setting the energy applied to a heating element having to receive the supply of a current corresponding to the applied history up to the previous time of the heating element and setting the upper limit value of the set applied energy corresponding to the applied history. CONSTITUTION:When the printing key of a keyboard 3 is pushed and the command of the start of printing is issued, environmental temp. is judged from the output of a thermistor 46 and the color kind of a printing ribbon is discriminated by a tape color sensor 44. When applied history is 'the presence of previous dots' and 'the presence of present dots' or 'the absence of previous dots' and 'the presence of present dots', pulse current supply times T1, T2 are read and T1 is set to a main pulse current supply time TM and the value calculated by subtracting Tl from T2 is set to a history pulse current supply time RT. TM is compared with a rated current supply time Tc1 and, in the case of TM>Tc1, the rated current supply time Tc1 is set as a new main pulse current supply time TM.</p> |
