Method and apparatus for detecting paper drive malfunctioning in

Details Method and apparatus for detecting paper drive malfunctioning in Method and apparatus for detecting paper drive malfunctioning in

1975-02-18

1976-05-25

Schacher, Richard A.

Advancing material of indeterminate length

Processes

226 11, 226 25, 226 43, 226 45, B65H 2502

Patent

active

039587355

ABSTRACT:
A drive shaft of an automatic printer engages tractors which, in turn, pull a paper web across a print mechanism. Located on the drive shaft is a drive shaft position cam which is fixed to the shaft and rotates therewith. Additionally, located upon the drive shaft for limited rotational movement thereon is a second cam. The shape of the second cam is similar to the shape of the first cam and formed integral with the second cam is a frictional surface engaged by the paper. During normal paper drive, the cams are out of registration and rotate in unison. In response to a paper jam condition, the first cam driven by the paper locks and the cams are forced into registration actuating a switch, the plunger of which rides on both of the cams. The switch signal thus serves to interrupt the paper drive mechanism in response to a paper jam condition.

REFERENCES:
patent: 1988980 (1935-01-01), Debrie
patent: 3071332 (1963-01-01), Dain
patent: 3077966 (1963-02-01), Cohn
patent: 3659081 (1972-04-01), Piccione
patent: 3862385 (1975-01-01), Johnson

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