Apparatus for sensing notches

Details Apparatus for sensing notches Apparatus for sensing notches

G - Physics

03

B

340/123

G03B 21/50 (2006.01) G03B 27/62 (2006.01) G03D 15/00 (2006.01)

Patent

CA 1074418

- 1 - APPARATUS FOR SENSING NOTCHES Abstract of the Invention A device for sensing notches in an edge of a longitudinally transported film strip has a two-armed lever pivoted at a point to one side of the film path to deflect in the film plane. One arm carries at its end a spring biased roller which rotates freely against the moving unnotched film edge but which is biased into engagement with a notch to deflect the lever. The other lever arm is contacted by the actuating button of a microswitch the internal spring of which biases the lever to a quiescent position. A preselected deflection of the lever from this position actuates the microswitch to indicate the presence of a notch. Stops limit the deflection of the lever which is essentially normal to the direction of film movement, deflecting from a just obtuse to a just acute angle when entrained by a notch. The microswitch may be replaced by a photoelectric switching arrangement.

244588

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