Film trap for a motion picture projector

Details Film trap for a motion picture projector Film trap for a motion picture projector

1993-04-28

1994-06-21

Gellner, Michael L.

Optics: motion pictures

Gates

352225, G03B 148

Patent

active

053231937

ABSTRACT:
An improved film trap for a motion picture projector. The film trap includes a runner assembly having first and second runner elements each having a reduced thickness. The reduced thickness of the first and second runner elements enables the first and second runner elements to contact a first side of the filmstrip such that only a portion of the filmstrip which includes the sprocket holes is contacted by the first and second runner elements. The film trap further includes first and second pressure bands having a reduced thickness substantially equivalent to the first and second runner elements thickness. The first and second pressure bands urge the filmstrip against the first and second runner elements by contacting a second side of the filmstrip such that only a portion of the filmstrip which includes the sprocket holes is contacted by the first and second pressure bands. In addition, the film trap includes a pair of tension shoes having a top surface including at least one relief notch and which is coated with a relatively low friction material such as TEFLON.TM.. The reduced thicknesses and the relief notch reduce the contact area between the filmstrip and the first and second runner elements, first and second pressure bands and the tension shoes. The reduction in contact area in conjunction with the TEFLON.TM. coating on the tension shoes reduces the amount of surface damage on the filmstrip incurred by advancing the filmstrip through the film trap. Consequently, the number of times that the filmstrip may be processed through the film trap is substantially increased before replacement of the filmstrip because of surface damage sufficient to hinder reading of the soundtrack by sound reproducing equipment.

REFERENCES:
patent: 1828768 (1931-10-01), Dina
patent: 1966684 (1934-07-01), Pollock
patent: 1991870 (1935-02-01), Schulz
patent: 3735939 (1973-05-01), Inaga
patent: 5048948 (1991-09-01), Johnson
patent: 5088813 (1992-02-01), Wakefield

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