| 摘要 |
To provide a thermal printer which can prevent the lifting phenomenon of the platen roller without reducing the printing speed. There is provided a thermal printer comprising: a frame (1) having a pair of side wall portions (2a and 2b) arranged to face each other at a predetermined interval in a paper width direction; a head support member (4) for holding a thermal head (3); a platen roller attaching/detaching mechanism (A) for detachably and rotatably bearing a platen roller (10) by the above-described pair of side wall portions; a pressing mechanism (B, coil springs S1 and S2) for bringing a surface of the above-described thermal head into contact with a circumferential surface of the above-described platen roller; and a gear transmission mechanism (G1) for transmitting a rotational driving force of a motor (M) to a driven gear (G2) fixed at one end of the above-described platen roller, wherein pressing force applied on a shaft end on the driven gear side of the above-described platen roller by the above-described pressing mechanism is made to be within a range of 1.3 to 3.0 times of pressing force applied on the other shaft end.
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