Patent ID: 6129464
Filing Date: 2000-10-10
Classification: B41J

Abstract:
A printing device comprising: a print head for printing an image on an image recording medium; a carriage mounted for movement along the image recording medium and supporting thereon the print head; a carriage guide for guiding the carriage during movement thereof; a motor for drivingly moving the carriage; a linear encoder having a plurality of division lines; a sensor supported by the carriage for movement therewith and for reading the division lines of the linear encoder to detect a running position of the carriage; a running position memorizing device for receiving pulse signals from the sensor corresponding to the division lines read and for calculating a running position of the carriage in accordance with the sensor pulse signals; and an error detection/correction circuit for receiving the pulse signals from the sensor, detecting a reading error by the sensor corresponding to an error in the detection of the running position of the carriage, and outputting an error correction signal to the running position memorizing device; wherein the running position memorizing device calculates a correct running position of the carriage in accordance with the error correction signal from the error detection/correction circuit, and the print head prints an image on the image recording medium in accordance with an output from the running position memorizing device.