Apparatus for sensing notches

Details Apparatus for sensing notches Apparatus for sensing notches

1976-01-23

1977-04-12

Schacher, Richard A.

Advancing material of indeterminate length

With material-responsive control means

Detector means

200 6114, B65H 2502

Patent

active

040170144

ABSTRACT:
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.

REFERENCES:
patent: 1488512 (1924-04-01), Outrey
patent: 1950692 (1934-03-01), Owens
patent: 2011272 (1935-08-01), Duggan
patent: 2166551 (1939-07-01), Perry
patent: 3696981 (1972-10-01), Levy

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