Thermal head printer

Abstract

Abstract PURPOSE:To obtain uniform density of printing by selecting the heating time by the number of dots heating at the same time in a thermal dot printer using a battery as a power source. CONSTITUTION:Receiving a printing command from a host computer 1, CPU2 orders a battery voltage detection part 3 to detect the voltage of a dry battery 4. In short, in the CPU2, the output voltage of the dry battery 4 is put in the 4- phase RM of a motor 6 to give a load similar to that during the printing period. The value detected by the detector 3 is stored in RAM8. In priting, CPU2 calculates the change in applied voltage due to the number of dots heating concurrently for letters to be printed on the basis of the detected value, and also determines a proper heating time at applied voltage calculated from a heating time table stored in ROM9.

Inventors

• 👤 Hiroshi Fukui
• 👤 博 福井

Bibliographic Details