Bidirectional printing system of serial dot printer

Abstract

Abstract PURPOSE:To obtain a printing with a better dot alignment by providing a fixed delay time for controlling determined by making it to correspond to variations in the ambient temperature between a step command and a dot command during the printing action. CONSTITUTION:A thermal head 5 moves from line to line to print a dot pattern every row. At the same time the ambient temperature is detected with a sensor 7 and inputted into a muCPU 1 via an analog-digital conversion circuit 6 to correct deviation in the dot printing position based on the data. This correction is made by selecting a value N of delay by the step and a timer value NA corresponding to the delay within one step from a table stored in a memory. This gives a delay time corresponding to the ambient temperature between a step command and a dot printing command to correct positional deviation within one dot interval completely. In addition, the sensor 7 serves to control the application of power to the head as a feed back thereby accomplishing the printing of a dot pattern at a uniform concentration.

Inventors

• 👤 Tomoyuki Haganuma
• 👤 芳賀沼　友行

Bibliographic Details