Patent ID: 8579528
Filing Date: 2013-11-12
Classification: B41J

Abstract:
1. A thermal printer comprising: a main frame; a thermal head that is installed in the main frame; a platen roller that is removably installed in the main frame and that has a roller shaft and a platen bearing mounted on the shaft; a head urging member that urges the thermal head against the platen roller in a first direction from a first side to a second side; a bearing insertion slot that is formed in the main frame; and a lock lever that urges the platen bearing in a second direction from the second side to the first side and that locks the platen bearing in the bearing insertion slot; wherein the bearing insertion slot has a flat bottom surface which is extended in the first direction, a first side surface that is extended from the first side of the bottom surface, and a second side surface that is extended from the second side of the bottom surface; the lock lever has a contact surface that contacts with the platen bearing, the contact surface being a concave surface, and a curvature of the contact surface being less than a curvature of an outside diameter of the platen bearing; when the lock lever is in a locked position locking the platen bearing in the insertion slot, the roller shaft of the platen roller contacts the first side surface, the second side surface, and the flat bottom surface; and when the lock lever is in an unlocked position in which the platen bearing is not locked in the insertion slot, the roller shaft of the platen roller contacts the second side surface and the flat bottom surface and does not contact the first side surface.