Double feeding prevention in a bottom sheet document feeder

Details Double feeding prevention in a bottom sheet document feeder Double feeding prevention in a bottom sheet document feeder

1990-08-24

1991-11-05

Schacher, Richard A.

Sheet feeding or delivering

Feeding

Separators

271123, 271167, B65H 334

Patent

active

050626027

ABSTRACT:
A multifeed resistance system 90 which is a simple and low cost modification of known non-retard type bottom sheet separator/feeders, especially a vacuum feeder 17 in which the stack 14 of sheets is fluffed by an air knife 18 and the front area of the bottom sheet 98 is pulled down by vacuum and fed vacuum out from the bottom of the stack 14 with the corrugating vacuum belt feeder 17 and there fed out of the tray 16 from underneath the stack 14. A limited area of special multifeed resisting or retarding member 92 under the rear area of the stack 14 has been found to be effective in resisting multifeeds, yet not interfere with effective bottom sheet sequential feeding. One or more areas of the double feeding resistance member 92 overly the rear or upstream portion of the stack supporting bottom surface 15 of the stacking tray 16. This is an oriented (one-way) fiber mat, cloth or pad material, the fibers 94 of which are angled upstream (oriented towards the rear of the tray 16). These upstream oriented fibers 94 engage the trail or upstream edge area of the second-from-the-bottom sheet 96 to resist its downstream movement as the bottom-most sheet 98 is being initially separated and fed out.

REFERENCES:
patent: 3640524 (1972-02-01), Fredrickson
patent: 3895791 (1975-07-01), Kramell et al.
patent: 3934869 (1976-01-01), Strobel, Jr.
patent: 4259406 (1981-03-01), Borrelli
patent: 4313599 (1982-02-01), Lohr
patent: 4336929 (1982-06-01), Hanzlik
patent: 4619450 (1986-10-01), Anderson et al.
patent: 4843436 (1989-06-01), Evangelista et al.
Xerox Disclosure Journal, vol. 10, No. 4, Jul./Aug. 1985.
Xerox Serv. Manual, 914/720/420 Copiers & Accessories, pp. 1-5.

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