PURPOSE: To prevent a recording paper from winding round a pressing roller without giving excessive rotational resistance to the pressing roller by arranging a jamming preventing member on a paper ejection side on the pressing roller so that it may perform pressing and energizing and providing a regulating means for regulating the jamming preventing member's movement to a side where the member separates from the pressing roller so that the quantity of the movement may be specified one.

CONSTITUTION: A paper ejection guide 30 is provided on the paper ejection side on the pressing roller 12 and a guide spring 40 is mounted on the pressing roller 12 side. The pressing and energizing force of the pressing part 42 of the spring 40 is set to be weak lest the excessive rotational resistance should be given to the roller 12. A stopper 34 for regulating the deformation and movement of the pressing part 42 is protrusively provided on the upper surface of the base part 31 of the guide 30. Therefore, even when unexpected force is exerted, a distance between the tip of the pressing part 42 of the spring 40 and the surface of the pressing roller 12 does not get wider than a fixed distance. Thus, the recording paper is prevented from being wound to the pressing roller without giving the excessive rotational resistance to the pressing roller.