Projector for endless film loops - uses two endless drive belts with projections engaging perforations in edge of film

摘要

The endless film projection system is designed for projecting slides. The film (13) is transported by an element which engages into the perforations of the film. The film is guided along a closed path. The length of this path is slightly less than the length of the film. The film path is formed by two endless transport belts (9) which rotate in alignment at a distance from each other equal to the film perforation bands. The two belts (9) each have fitted at the same spot at least a projection. Each of these projections engages into one of the two perforation bands of the film. The front and end of the film being located in each projection.