Apparatus for sensing sheets

Details Apparatus for sensing sheets Apparatus for sensing sheets

1989-05-26

1991-04-16

Schacher, Richard A.

Sheet feeding or delivering

Feeding

With means to interrupt feeding

271110, B65H 702

Patent

active

050076280

ABSTRACT:
Apparatus for sensing the passage of sheets (1) through a nip formed by rollers (5 and 6), includes a core (14), moving with the shaft of one of the rollers, and a flat coil (15) connected to an oscillator circuit for sensing the deflection of one roller relative to the other. The oscillator circuit (18) provides a train of signals the frequency of which varies with the amount of the relative deflection of the rollers, and a counter (19) counts the signals from the oscillator in a fixed time interval. A store (22) stores counts representing the relative deflections of the rollers in a cycle of movement of the rollers when no sheet is present. The difference between a subsequent count and a stored count for a corresponding position in the cycle of rotation of the rollers is compared with a predetermined threshold, to establish the presence or absence of a sheet between the rollers.

REFERENCES:
patent: 4068385 (1978-01-01), Mitzel
patent: 4420747 (1983-12-01), Kistner
patent: 4506880 (1985-03-01), Dixon
patent: 4527793 (1985-07-01), Bottcher
patent: 4560159 (1985-12-01), Staub
patent: 4700368 (1987-10-01), Munn

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