A print speed controller

摘要

There is provided a control method and a controller for a thermal print head and a motor using an encoder in a thermal printer, in which the movement of the motor is controlled using an output signal of the encoder fitted to the motor and the period for allowing the thermal print head to heat a medium is synchronized with the output signal of the encoder. The controller includes an encoder for converting movement of the motor into an electrical signal and outputting the electrical signal, and a counter unit for counting variations of the electrical signal and generating and outputting a signal for starting the heating of a medium by the thermal print head whenever the number of variations is equal to a predetermined value.