Line thermal head letter printing method is improved to feed ribbon tape synchronously with transfer velocity of print object sheet from immediately after start of printing so as to obtain high quality letter printing. Ribbon tape master roll (6) is driven by stepping motor (18) so as to feed necessary amount of ribbon tape (4). Ribbon tape winding roll (8) is driven via friction transmission so as to wind the ribbon tape (4) at velocity higher than that of transferring print object sheet (2). There occurs no loosening of ribbon tape hot release portion at tip of line thermal head (10) and high quality letter printing is obtained.
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