Patent ID: 6150777
Filing Date: 2000-11-21
Classification: G05B,H02K,H02P

Abstract:
A printing mechanism having a direct current motor that generates a positional feedback signal, comprising:a printhead for printing an image;a print media handling system for feeding print media through a print zone;a carriage on which the printhead is disposed, the carriage being configured for travel across the print zone;a direct current motor having a shaft, the direct current motor being configured so that application of a direct current voltage to the motor causes the shaft to rotate and produces a current that varies with time between a maximum magnitude, an intermediate magnitude, less than the maximum magnitude, and a low magnitude, less than the intermediate magnitude, the maximum magnitude being indicative of a position of the shaft of the motor; anda feedback circuit coupled to the direct current motor that utilizes the time varying current magnitude to correct for any inaccuracies in the positioning of the shaft of the direct current motor.