System for detecting the accurate positioning of sheets along a

Details System for detecting the accurate positioning of sheets along a System for detecting the accurate positioning of sheets along a

1990-07-16

1991-07-30

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

050354159

ABSTRACT:
An improved sheet-position detection system for apparatus having a sheet feed path and a use location(s). The position detection system includes a first capacitive sensor including a first pair of parallel plate members located in opposing relation on opposite sides of the feed path plane and centered on a desired lead sheet edge position. A second capacitive sensor includes a second pair of parallel plate members that are located in opposing relation on opposite sides of the feed plane and are centered on a desired trail sheet edge position. A bridge circuit applies potentials across the pairs of plate members in a circuit configuration such that output signals of the first and second sensors are subtracted, and when the combined outputs of the first and second sensors is zero, a feed sheet is indicated to be centered between the sensor means.

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: 4738442 (1988-04-01), Rodi et al.

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