Patent ID: 7333122

Claim:
A method of printing thermal media by aligning an image using a printer, the printer having a thermal printhead, a feeding roller, and an edge detection sensor sequentially disposed in a print proceeding direction, the method comprising the steps of: detecting a front edge of the thermal medium using the edge detection sensor and feeding the thermal medium having a first surface and a second surface in a first direction so that the front edge of the thermal medium moves a first distance from the edge detection sensor, the thermal medium having a print starting position located at a position corresponding to a heating element of the thermal printhead; performing a printing process for the first surface while feeding the medium in a second direction; rotating the thermal printhead so that the thermal printhead faces the second surface of the thermal medium; detecting the front edge of the thermal medium using the edge detection sensor and feeding the thermal medium in the first direction so that the front edge of the thermal medium moves a second distance from the edge detection sensor and the print starting position of the second surface is located at a position corresponding to the heating element of the thermal printhead; and performing a printing process for the second surface while feeding the thermal medium in the second direction.