Detection device for paper or film in web form

Details Detection device for paper or film in web form Detection device for paper or film in web form

1976-03-08

1978-06-13

McIntosh, John P.

Electricity: circuit makers and breakers

Special application

Running length, web or strand actuated

19 024, 73159, 118 8, B65H 2514

Patent

active

040950638

ABSTRACT:
The device for detecting local thickening in webs of paper or film is based on the fact that the thickenings are first mechanically sensed and the mechanical sensing is converted by simple means into an electrical signal. The arrangement consists basically of a stationary roller over which the web to be examined is guided and a pivotal sensor roller mounted at a narrow interval from the guide roller. The sensor roller is mounted on two separate pivotal levers and rotates at the same speed as, but in the opposite direction to, the guide roller. The pivotal levers are provided with stops which determine a gap between the guide roller and the sensor roller through which the web is guided. The stops are in the form of contact switches through which the same electrical current successively flows, so that the flow of current is temporarily interrupted when one or both stops is lifted off its support when a thickening passes through the gap.

REFERENCES:
patent: 2836668 (1958-05-01), Remington
patent: 2960731 (1960-11-01), Hogg, Jr. et al.
patent: 3301974 (1967-01-01), Hancock
patent: 3680529 (1972-08-01), Francis
patent: 3763483 (1973-10-01), Urmenyi
patent: 3796094 (1974-03-01), Cook et al.
patent: 3842668 (1974-10-01), Lippke

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