part of the cassette as the cassette is in an inclined position the film sheet within the cassette falls out of it as the cassette is opened the film sheet slides downwardly along the inside face of the cassette lid and travels on downwardly towards rollers 26 and 27 which will feed it through the entrance slot of a processing machine 12 a part of which is shown during its descent the film engages the contacts of microswitches 28 and 29 one of these microswitches controls the rotation of a motor 30 which drives the rollers 26 27 via a driving belt the other microswitch activates an identification unit 34 functioning as described hereinafter when the film sheet reaches the nip of rollers 26 27 they are stationary the motor circuit includes a timer 32 which delays effective rotation of the rollers 26 27 until a few seconds after the impact of the film sheet against such rollers if the film sheet is skewed when it contacts the rollers it becomes squared before the resulting rotating movement of the rollers commences consequently it is ensured that the sheet is properly orientated in its own plane before it becomes advanced to the processing machine in a preferred embodiment of the apparatus the time delay between impact of the film against the transporting rollers and the commencement of film advance by such rollers amounts to five seconds if desired the time switch 32 may be of a double cycle type and operates first to start the rollers rotating in reverse sense when the film sheet first contacts the rollers then to stop the rollers and subsequently to start rotation of the rollers forwardly for propelling the film.