Patent ID: 6538680
Filing Date: 2003-03-25
Classification: B41J

Abstract:
A thermal printer comprising:a frame having a pair of side wall portions arranged to face each other at a predetermined interval in a paper width direction; a head support member for holding a thermal head; a platen roller attaching/detaching mechanism for detachably and rotatably bearing a platen roller by the pair of side wall portions; a pressing mechanism for bringing a surface of the thermal head into contact with a circumferential surface of the platen roller with predetermined pressing force so that pressing force applied on a shaft end on a driven gear side of the platen roller is made to be within a range of 1.3 to 3.0 times of pressing force applied on the other shaft end; and a gear transmission mechanism for transmitting a rotational driving force of a motor to the driven gear fixed at one end of the platen roller.