Abstract: A film transporting arrangement of a camera has a film transporting handle, a perforation wheel, a polygonal disk connected with the perforation wheel and having a plurality of surfaces and a number of corners corresponding to the number of teeth of the perforation wheel, and two arresting arms pretensioned relative to one another and arranged so that they engage the surfaces formed between two neighboring corners of the polygonal disk and correspond to these surfaces so as to press the polygonal disk, and thereby the perforation wheel, to a respective angular position.

Abstract: A motion-picture film cassette has a pay-out spool and a take-up spool mounted coaxially, but at opposite sides of a divider wall. Film travels in one direction through the wall from the pay-out spool to the take-up spool. An anti-reversing device is provided to prevent reverse movement of the film and/or spools; it includes an annulus of holes in the wall, surrounding the axis of the spools, and a resiliently yieldable finger projecting from that surface of the take-up spool which faces the wall. The finger ratchets over the holes when the take-up spool turns in take-up direction but engages in a respective one of the holes to block reverse movement when the take-up spool attempts to turn in the opposite direction.

Abstract: Apparatus for pivoting a shutter or a filter between two end positions in a photographic copying machine has two magnetic systems one of which moves the shutter or filter during the last stage of movement from one to the other end position and thereupon holds the shutter or filter in the selected end position. The other magnetic system initiates the movement of shutter or filter from the one to the other end position and accelerates it during movement to a neutral position midway between the two end positions. The other system is deactivated while the shutter or filter moves between the neutral and other end positions. Each system can include an electromagnet. Alternatively, the other system employs two electromagnets and the one system then uses a permanent magnet which shares the movements of the shutter or filter.