Abstract: A projection device comprising a film projector and a loop box for a continuous film in which the projector includes a sprocket for feeding the continuous loop of film through a film gate which may be of the customary type. The loop box comprises a frame having transversely and longitudinally spaced upper and lower shaft supports, a plurality of shafts journaled in each of said upper and lower shaft supports, a plurality of pulleys rotatably mounted on each of the shafts by means of ball bearings and means to drive each shaft in the direction which the rollers mounted thereon move when the film loop is advanced through the film gate by the drive sprocket.

Abstract: Method and apparatus are disclosed for cleaning endless strips of motion picture film, magnetic tape, magnetic film, or the like contained in a reel formed on a rotatable hub housed in a casing, wherein cleaning is accomplished without opening the casing or removing the reel of film or magnetic tape therefrom. Successive portions of the film or tape stored in the reel are withdrawn as a continuous strip from the center of the reel. The strip is then continuously fed through an access opening in said casing to form a loop outside of the casing, wherein the strip is subjected to a cleaning means. The strip from the loop is introduced back through said opening to guide means within said casing. The guide means directs the strip of film or tape past an operational opening in the casing which is separate and apart from the access opening. The strip is then continuously returned to the reel.