A METHOD FOR CONTROLLING LINE FEED MOTOR OF 9-PIN PRINTER

摘要

A control method features feeding paper without back lash using stepping motor, gear train and S/W when feeding 1/144 inch after one pass for near letter quality (NLQ) printing (or 144dpi printing). Upon setting line feeding number, the CPU (10) sends a signal to motor driver (40) via IN/OUT port (30) so that the stepping motor (50) rotates N-step more in forward direction and N-step in reverse direction to remove back lash in compensating manner using gear train (60) and platen (70).