| 摘要 |
Accumulation of foreign matter on the surface of a thermal head that can cause printing defects can be reliably prevented. The downstream edge of a surface of the thermal head is substantially flush with the downstream end of a paper nipping area and a platen roller in the thermal printer. The downstream end extending from the downstream edge perpendicular to the back side is connected to a through-hole formed in a heat sink. Foreign matter on a liner-less label paper clings to the downstream end of the thermal head after passing the paper nipping area, and is then fed along the downstream end into the through-hole on the back. Foreign matter does not accumulate on the surface of the thermal head, and problems such as streaking and other printing defects caused by foreign matter on the surface of the thermal head do not occur.
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