G - Physics – 03 – B
Patent
G - Physics
03
B
88/87, 88/88
G03B 23/06 (2006.01) G03B 21/11 (2006.01)
Patent
CA 1122836
ROTARY FILM STRIP HOLDING APPARATUS Abstract of the Disclosure Apparatus for holding film strips of the type having a plurality of miniaturized film images car- ried thereon, wherein the apparatus is to be used with an optical system which illuminates and pro- jects the images on an enlarged scale so that they can be viewed on a projection screen. The appara- tus includes a rotary film holder or cassette having a number of concentric cylindrical segments defining a pair of coaxial cylinders, the segments being pro- vided with grooves to permit insertion of a plurality of film strips in the cassette. The inner segments are longer than the outer segments so that portions of the radially outermost edges of the film strips are exposed and the outer edge of a selected film strip can be engaged by an edge drive wheel to per- mit the selected film strip to be moved partially out of and to be returned to the cassette. The cassette is rotatably mounted by spaced bearings on a projection carried by a stationary support, and a drive wheel coupled to a reversible motor engages the outer periphery of the cassette to rotate it in opposed directions. An optical system on the sup- port is used with an X-Y drive to project an image on the selected film strip onto a screen when the film strip is releasably held in a predetermined focal plane by hold-down means. Control structure coupled with the drive motors of the cassette, the edge drive wheel and the X-Y drive controls such motors to effect operation of the apparatus.
332881
Kool Bram
Moritz Jules G.
Warszawski Janusz
Fetherstonhaugh & Co.
Microform Data Systems Inc.
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