Abstract: The improved film clamp comprises a base plate having an aperture defined therethrough and over which a film strip is positioned in a plane; a platen having a flat surface and an aperture defined therein and mounted to said base plate with the apertures of said base plate and said platen aligned with each other when the platen is clamped to the base plate; and flexible gripping means positioned around the periphery of the aperture of either said platen, said base plate or both, each of said flexible gripping means including a locating section arranged so as to be inserted into locating slots provided around the periphery of the aperture of either said platen, said base plate or both, said locating slots being, when said base plate and said platen are clamped together, substantially perpendicular to the plane of the film strip and a gripping section angled with respect to said locating section outward from the aperture(s) so as to grip and tension said film strip between said base plate and said platen when th

Abstract: The disclosed invention provides a means for controlling film flatness at r interfaces in the aperture where the film is used as an imaging medium between film holder plates, such as aperture plates. The film is held flat by lateral tension applied outward in all directions from the center portion of the area of the film being viewed by rubberized type O-rings in grooves on each of the aperture plates being clamped against the film by various clamping direct transverse pressure means. The lateral tension is caused by the stretch of the O-ring outward from the center of the aperture by the shape of grooves in the plates constraining any inward movement but providing bias movement of the O-rings outward.

Abstract: A film transport mechanism for an optical printer in which the film is positively clamped and laterally tensioned at the position of the aperture between each film advance step, so that the film lies absolutely flat in the focal plane of the lens system of the printer during exposure. This is achieved by providing registration pins and a pressure pad at one side of the film and a curved blade at the other side that move towards and clamp the film. The blade progressively tensions the film laterally against the pressure pad and registration pins.

Abstract: A device for guiding a film in a cine camera comprises a channelled plate pierced with a window for filming and along the rear face of which is displaced the film. A presser member is disposed behind the film, opposite the filming window in the channelled plate, and means are provided for applying the presser member under pressure against the film and the channelled plate, when the film is stopped during filming, and for eliminating this pressure during the descending movement of the film. The means controlling the pressure exerted by the presser member on the film comprise a periodic magnetic field generator producing, during the descending movement of the film, a magnetic film acting on the presser member, made of ferromagnetic material, to eliminate the pressure of the presser member on the film during the descent thereof.

Abstract: A film transport mechanism including an aperture assembly through which the film is advanced, the aperture assembly defining a film path of a waveform longer or equal to the fundamental modal waveform of the film. The film path may include bristle like strips for damping film waveforms higher than the first mode.

Abstract: A composite projector gate, aperture and light dowser assembly for a cinematograph film projector. The film guide surface through the gate area is curved convex towards the light source, film being held to curved marginal guides by flexible bands anchored before the gate, in the direction of film motion. A quick-release anchor is provided to retain the tension springs. The projection aperture comprises a removable plate in front of which, towards the light source, are spaced-apart heat screens with a horizontally-moving light-dowser blade therebetween in a space in which is provided forced air ventilation.