Self-calibrating system for detecting media movement by using ca

Details Self-calibrating system for detecting media movement by using ca Self-calibrating system for detecting media movement by using ca

1990-07-16

1991-12-31

Olszewski, Robert P.

Sheet feeding or delivering

Feeding

By means to convey sheet

271227, 271259, 340563, 340675, B65H 702, G08B 1326, G08B 2100

Patent

active

050765663

ABSTRACT:
A sheet movement detection system for apparatus having a sheet feed path includes a first capacitor sensor including a first pair of parallel plate members located in opposing relation on opposite sides of the feed path plane at an upstream position and second capacitor sensor including a second pair of parallel plate members, which are correspondingly sized and spaced to said first plate members, in opposing relation on opposite sides of the feed path plane at a downstream position. The sensors are coupled in a detection circuit which applies potentials across the pairs of plate members so that output signals of the first and second sensing means are subtracted from one another. A position circuit detects the output of the detection circuit during movement of a sheet lead edge through the second sensor and provides a sheet lead-edge position signals indicating the position or velocity of the sheet lead edge.

REFERENCES:
patent: 2673340 (1954-03-01), Johansson et al.
patent: 3230519 (1966-01-01), Metz et al.
patent: 3519922 (1970-07-01), Nash et al.
patent: 3646372 (1972-02-01), Snellman et al.
patent: 4258326 (1981-03-01), Johne
patent: 4276547 (1981-06-01), Bowen et al.
patent: 5035415 (1991-07-01), Lee et al.

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