PURPOSE: To feed adequately a photosensitive material and to eliminate the waste in the photosensitive material by providing an automatic feed mechanism which sets the movement extent of the photosensitive material such as a photographic film, electrocopying photosensitive body or the like according to the size of apertures.

CONSTITUTION: Projections 10aW10c are provided in respectively different positions of apertures 6aW6c having light transmission parts of the sizes different according to the size of an original. Micro-switches SWaWSWc are provided in the positions corresponding to the projections when they are inserted into a camera. A motor M is run by a film winding signal MDS. If it is assumed that the aperture 6a is inserted into the camera, the switch SWa is closed to conduct a transistor Tr1 after the time determined by the dark constant element of Ra C, thereby energizing a solenoid S. A clutch is then disengaged to stop the film winding and the film is fed by an much as the length corresponding to the size of the opening of the aperture 6a.