A storage film feed feeds a storage film from a flexible sleeve open on one side at a rear side in a storage film detection device. The storage film feed has a feed opening with a penetration gap for the storage film and a slide located in the feed opening for fixing the sleeve. The slide is disposed perpendicular to a flat side of the sleeve. The storage film feed further has a stopping member for the slide, the flat side of the sleeve rests against the stopping member when the slide is actuated.