| 摘要 |
A duplex printer, in which when a first thermal head (1) prints information (24, 35, 45, 55) on a front side (12a, 21a, 22a, 31a, 32a, 41a, 42a, 51a, 52a) as an information printing side of a printing medium (12, 21, 22, 31, 32, 41, 42, 51, 52), a second thermal head (2) repeatedly prints a previously registered and selected fixed pattern or notice information (23, 34, 44, 54) on a back side (12b, 21b, 22b, 31b, 32b, 41b, 42b, 51b, 52b) as an information non-printing side of a printing medium (12, 21, 22, 31, 32, 41, 42, 51, 52) at regular cycle or at an optional timing.
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