| 摘要 |
A thermal printer unit includes a thermal head assembly (42) and a platen roller (43). The thermal head assembly includes a frame (50) having platen roller receiving parts (55, 56) receiving both ends of the platen roller, respectively; a thermal head (70) mounted on the frame; and a spring member (80) mounted on the frame and applying a head pressure to the thermal head. Each platen roller receiving part comprises: a vertical groove part (55a) having an opening at the top thereof; a horizontal groove part (55b) extending from the bottom of the vertical groove part in a direction such as to be away from the thermal head; and a projection part (55d) formed relatively by the vertical groove part and horizontal groove part, located above the horizontal groove part, and projecting from a recess part of the horizontal groove part toward the thermal head. Both ends of the platen roller are inserted into the horizontal groove parts, respectively, and, also, are pressed by the spring member via the thermal head into the recess parts thereof, respectively. <IMAGE> |
