PURPOSE: To prevent an image receiving sheet, specially, its rear end part from being stained by pressing the pressure rollers when the front end of a latent image reaches the position of the pressure roller and releasing the rollers from being pressed when the rear end of the latent image passes the position of the pressure rollers.

CONSTITUTION: A buffer roller 3 is moved as shown by an arrow A to draw a photosensitive sheet 2 out of the supply shaft 1a of a cartridge and the sheet is exposed at an exposure part P1 to reflected light from an original 4a to form the latent image on the sheet 2. When the exposure is finished, the roller 3 is moved as shown by an arrow B to feed the sheet 2 to a pressure development part P2 and the sheet is superposed upon the image receiving sheet 8 and pressed between pressure rollers 6a and 6b to perform pressure development processing. When the latent image front end of the sheet 2 reaches the development part P2, the sheet is pressed while the rollers 6a and 6b are rotated and when the latent image tail end reaches the development part P2, the sheet is released from being pressed to prevent dye from sticking on the rear end part of the sheet 8.