PRINTER

PROBLEM TO BE SOLVED: To remove wrinkles by controlling the rotating speed of a heating roller, and extending and flattening a printing sheet on this side of a recording head. SOLUTION: A controller conveys a printing sheet S to the position of a recording head at the required speed for a printing process, changes the speed of a drive section 40 based on the irregularity information from a wrinkle detection section, and corrects the speed of the drive section 40 based on the irregularity information from the wrinkle detection section. A wrinkle removal section is provided with a heating roller 81 and a backup roller 82 excited by a power supply P driven by the drive section 40 at a variable speed. The wrinkle removal section heats the printing sheet S on a conveyance path W between the rollers 81, 82, shifts the printing sheet S toward the recording head, and applies tension to the printing sheet S between it and a constant-speed roller 91. A detection roller 112 fitted to a rocking arm 111 is located on a conveyance base 92 into contact with the printing sheet S, the rotation angle of the rocking arm 111 due to irregularities of wrinkles is detected by an angle sensor 113 and can be reported to the controller.