Patent ID: 8139093

Claim:
A thermal printer comprising: a first thermal print head; a first platen roller; a second thermal print head; a second platen roller; a printer frame on which the first thermal print head and second platen roller are mounted; a first arm on which the first platen roller is mounted and which can move between a first closed position where the first platen roller is pressed to the first thermal print head, and a first open position where the first platen roller is separated from the first thermal print head; and a second arm on which the second thermal print head is mounted and which can move between a second closed position where the second thermal print head is pressed to the second platen roller and a second open position where the second thermal print head is separated from the second platen roller; and wherein the second arm moves from the second open position to the second closed position when the first arm moves from the first open position to the first closed position; and the second arm moves from the second closed position to the second open position when the first arm moves from the first closed position to the first open position; wherein the second arm reaches the second closed position before the first arm reaches the first closed position when the first arm moves from the first open position to the first closed position.