PURPOSE: To easily adjust the clearance between a press roller and the glass surface of an image sensor so as to improve the workability by providing rotatable rollers for securing the clearance between the press roller and glass surface of the image sensor.

CONSTITUTION: Idle rollers 27 composed of hard rubber, etc., are fitted to a shaft 21 which is coaxial to a press roller 18 on both sides of the roller 18. The rollers 27 are larger in radius than the roller 18 and the difference is corresponding to an appropriate clearance between the roller 18 and the glass surface of an image sensor 17 so that the rollers 27 can rotate irrespective of the roller 18. When a slip 10 is carried to an image reading mechanism 16, sensors 20c and 20c detect the leading edge of the slip 10. A control section receives signals from the sensors 20c and 20d and energizes a solenoid 25 to operate. The solenoid 24 attracts a spring 24 in the direction shown by the arrow C' and a bracket 22 rotates around a shaft 23 in the direction shown by the arrow B'.