Duplex printer

A duplex printer comprising:

• a conveying mechanism which pulls out and conveys a printing medium in which the printing medium is wound and a first side and second side thereof are thermal recording sides, the conveying mechanism being configured to store the printing medium, and the printing medium being cut by each piece of printing data that has been printed;
• a first thermal head which contacts the first side of the conveying printing medium, and prints information included in printing data;
• a second thermal head which contacts the second side of the printing medium, and prints specified information on the second side repeatedly;
• a memory which stores the printing data and one or more fixed pattern and notice information;
• a printing style setting unit which selects and sets a printing style for the printing data, and the fixed pattern or notice information becoming the specified information;
• and
• a drive control unit which controls conveyance of the printing medium and printing of the first thermal head and the second thermal head,
• wherein when a plurality of pieces printing data are printed on the first side of the printing medium consecutively by the first thermal the drive control unit is configured to start the printing of the fixed pattern or notice information on the second side from the beginning in order by the second thermal head, in sychronization with the timing that a head of the conveyed printing medium contacts the second thermal head, and to perform control so that on the back side, the fixed pattern or notice information is printed from the beginning at all times, and the printing by the second thermal head is completed in light of the area of the printing medium to be printed by the first thermal head for conformity of the printed area.