Jam detector

Details Jam detector Jam detector

1977-11-25

1980-05-20

Stoner, Jr., Bruce H.

Sheet feeding or delivering

Feeding

With means to interrupt feeding

271178, B65H 4308, B65H 714

Patent

active

042035899

ABSTRACT:
A jam detector comprising a sensor for producing a first signal which indicates the presence of a document at a predetermined position in a document path and a second signal which indicates the absence of a document at the predetermined position in the document path. The presence and absence indicating signals are sampled at regular intervals of document motion along the document path and the resultant signals are applied in a preferred embodiment to a bidirectional counter to increment for presence signals and decrement for absence signals. These presence and absence signal indications are accumulated in the counter and a jam indication is produced when the accumulated count reaches a predetermined value.

REFERENCES:
patent: 3136423 (1964-06-01), Delplace et al.
patent: 3193283 (1965-07-01), Smith
patent: 3390878 (1968-07-01), MacNeill et al.
patent: 3778629 (1973-12-01), Terryn
patent: 3779440 (1973-12-01), Casale et al.
patent: 3815895 (1974-06-01), Dufour
patent: 3927878 (1975-12-01), Bolsenga et al.
patent: 3944933 (1976-03-01), Gallet
patent: 4022460 (1977-05-01), Pritchett

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