Patent ID: 8529143

Claim:
A printing apparatus comprising: a thermal recording paper conveyance mechanism which conveys thermal recording paper along a paper conveyance path; a first thermal head which is provided along the paper conveyance path, and is arranged to face a first surface side of the paper conveyance path; a first platen roller which is arranged to face the first thermal head across the paper conveyance path; a first spring that presses the first thermal head toward the first platen roller with a first force in a horizontal direction; a second thermal head which is provided along the paper conveyance path and on a supply side of the thermal recording paper with respect to the first thermal head, and is arranged to face a second surface side of the paper conveyance path; a second platen roller which is arranged to face the second thermal head across the paper conveyance path, wherein an outer diameter of the first platen roller is larger than an outer diameter of the second platen roller; a second spring that presses the second thermal head toward the second platen roller with a second force in a vertical direction; a pinch roller which is arranged to face the first platen roller across the paper conveyance path, wherein the pinch roller presses the thermal recording paper toward the first platen roller with a third force in a vertical direction opposite to the second force; a drive mechanism which drives the first platen roller and the second platen roller; and feed operation selecting means for placing priority on a feed operation of one of the platen rollers to a feed operation of the other platen roller, when the first platen roller differs from the second platen roller in a feed speed of the thermal recording paper.