| 摘要 |
<p>PURPOSE:To prevent a thermal head from overheating, by a method wherein when the number of picture elements printed in any one of divided sections is larger than a predetermined value, printing in the subsequent sections in the same scanning for printing is conducted in a divided manner. CONSTITUTION:When printing with a relatively high printing density as shown in Fig. 1, a printing-restricting signal is supplied into a printing-controlling part when the printing proceeds to the second section N2. Accordingly, starting from the third section N3 subsequent to the second section N2, driving singals for printing are extracted from printing data for every other dot row, and are supplied from the printing-controlling part to the thermal head to scan the head one time, whereby printing of a bar graph part starting from the third section N3 is conducted for every other dot row, as shown in Fig. 2. Then, synchronously with the completion of the first-time scanning, the thermal head is returned without feeding the paper, then printing signals related to the dot rows which have been skipped in the preceding printing are supplied, and the second- time scanning is conducted to print an image shown in Fig. 3, thereby completing the printing of the image shown in Fig. 1.</p> |
