| 摘要 |
PROBLEM TO BE SOLVED: To enable smooth conveyance of a thermal paper even if outer diameters of platens are not strictly managed in the case of driving the two platens by the same driving motor. SOLUTION: The double-side printing thermal printer comprises a feeding mechanism 23 which supplies the thermal paper P along a paper conveyance path 22, a first thermal head 51 set along the paper conveyance path 22, a first platen 52 arranged by holding the paper conveyance path 22 between it and the first thermal head 51, a second thermal head 61 set along the paper conveyance path 22, and a second platen 62 arranged by holding the paper conveyance path 22 between it and the second thermal head 61. A product of the outer diameter and a rotating angle of the first platen 52 is formed larger than a product of the outer diameter and a rotating angle of the second platen 62. A driving force to the thermal paper P from the first platen 52 is set larger than a driving force to the thermal paper P from the second platen 62. COPYRIGHT: (C)2008,JPO&INPIT
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