PURPOSE: To prevent a recording medium from floating by a method wherein a lower region area of the recording medium is ensured by pinching certainly the recording medium between a paper feed roller and a pressure roller just under a printing pin, and further the recording medium is deflected to a flat platen surface with a paper guide plate to be made parallel with the flat platen surface.

CONSTITUTION: A flat platen 8 arranged in parallel with a printing pin 1 is made freely rotatable with a rotary support 19. Further, an emboss 8a part is pulled with a spring 20 below the printing pin 1 so as to abut against a paper guide plate 6. Furthermore, a pressure roller 5 arranged near the printing pin 1 is held with a spring 18 to be brought into pressure contact with a paper feed roller 7 by specific force. A recording medium 21 pinched between the paper feed roller 7 and the pressure roller 5 is certainly sent to be arranged near the printing pin 1. Then, the recording medium 21 is deflected to a surface of the flat platen 8 to be made parallel thereto with the paper guide plate 6 covering to just under the printing pin 1 on an outer periphery of the paper feed roller 7.