Patent ID: 7192205
Filing Date: 2007-03-20
Classification: B41J,Y10S

Abstract:
1. A method for reducing a printing position error, the method comprising the steps of: (a) driving an encoder wheel as many times as a predetermined number of forward counts at a predetermined initial acceleration, thereby making the edge of a printing paper become separated from a sensing unit and conveyed in a forward direction; (b) driving the encoder wheel at the predetermined initial acceleration and conveying the printing paper in a backward direction, thereby making the edge of the printing paper become in contact with the sensing unit and generating a number of backward counts; (c) calculating a difference value between the number of backward counts of the encoder wheel from a start time of the backward driving to a point when the sensing unit detects the edge of the printing paper and the number of forward counts; and (d) repeating the steps (a) through (c) for a designated number of times while varying the predetermined initial acceleration, and setting an initial acceleration corresponding to a smallest value among the difference values as the initial acceleration for driving the encoder wheel.