A process camera apparatus for forming a halftone image and a line image on a photosensitive material such as a positive or negative film. The apparatus comprises a base; a transparent platen provided on the base; a light-shielding cover covering the upper side of the transparent platen such as to form a light-shielded region on the transparent platen; a screen device including a contact screen and a screen frame for supporting the contact screen, the screen device being withdrawably disposed on the portion of the transparent platen within the light-shielded region; a pair of rollers disposed adjacent one end of the base and adapted for conveying the photosensitive material into the light-shielded region; and a light-shielded condition maintaining device adapted to maintain the light-shielded condition in the light-shielded region when the screen device is being taken out from the light-shielded region. The apparatus may be provided with a guide plate for guiding the photosensitive material while the same is being fed onto the transparent platen by the pair of rollers.
