Optics: motion pictures – Removable film strip magazine type – Magazines
Patent
1991-03-27
1993-09-07
Hayes, Monroe H.
Optics: motion pictures
Removable film strip magazine type
Magazines
352156, 242193, 242194, G03B 2302
Patent
active
052433692
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a film cassette.
Film cassettes are known with sequentially arranged housing parts to receive the film supply reel as well as the film takeup reel, said cassettes optionally having their own drive or a drive couplable with the drive motor of the motion picture camera. A window-shaped opening serves to conduct the film from the film cassette to the motion picture camera, where it is exposed and then conveyed past the window back into the film cassette. A gasket between the film cassette and the motion picture camera provides a light-tight transition. The link between the film cassette and motion picture camera is provided by a locking device which permits a releasable coupling between the film cassette and the motion picture camera.
One disadvantage of known film cassettes with sequentially arranged housing parts to receive the film supply container and film takeup container consists in their considerable lengthwise dimensions, which can pose problems especially with long film lengths. For this reason, film cassettes with housing halves arranged side by side have been produced in which the housing halves to receive the film supply container and the film takeup container are arranged side by side, resulting in a limited structural length of the film cassette. The greater width of the film cassette generally does not pose a problem since the motion picture camera has a minimum width in any event.
However, the problem with film cassettes with housing halves mounted side by side is the guidance of the film in the vicinity of the cassette window, so that there is a risk of the film being damaged, considerable noise being generated, and the film jamming in the vicinity of the deflecting device.
FR-A-1,458,630 teaches a motion picture camera with a film cassette, which consists of a one-piece housing with a film supply reel and a film takeup reel to receive the exposed or unexposed film. In addition, the motion picture camera has a film path with a cassette window and a cassette drive. To guide the film from the film supply reel to the film takeup reel, a manually producible turning loop is provided by which the film is twisted through 360.degree.. This manual turning loop must be produced each time a cassette is connected to or disconnected from the motion picture camera so that the film is guided from the film supply reel to the film takeup reel which is arranged coaxially with respect to the film supply reel. This results in inadvertent exposure of considerable film lengths and to a cumbersome and time-consuming procedure.
The goal of the invention is to provide a film cassette of the species recited at the outset, in which the film is transported from one housing half to the other housing half of the film cassette with limited friction and hence limited noise production and without risk of jamming or damage to the surface of the film and in which the film is guided from the film supply reel to the film takeup reel without manual intervention.
The solution according to the invention ensures a gentle, nearly noise-free, and safe transport of the film from one housing half to the cassette window and via the motion picture camera back to the other cassette half with minimum friction and without twisting or crossing of the film relative to the film plane and permits automatic guidance of the film from the film supply reel to the film takeup real located coaxially with respect to the film supply reel, so that no inadvertent exposure of the film occurs, and simple and safe handling is ensured.
One advantageous improvement on the solution according to the invention is characterized by the fact that the turning loop device consists of a shell against which the outer surface of the film abuts and which has a uniform twist of 360.degree., with the film inlet and outlet being arranged so that the side edges of the film enter the sleeve parallel to one another and emerge from the sleeve in the same manner. This design of the solution according to the invention ensures that the outer surface of the
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patent: 1428480 (1922-09-01), Giroux
patent: 1708087 (1929-04-01), Friess
patent: 2476705 (1949-07-01), Coutant et al.
patent: 3278252 (1966-10-01), Wagner et al.
patent: 3398909 (1968-08-01), Jotzoff
patent: 3537780 (1970-11-01), Angenieux
patent: 3719417 (1973-03-01), Lecoeur
patent: 3829203 (1974-08-01), Novak
Arnold & Richter Cine Technik GmbH & Co.
Hayes Monroe H.
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