Bottom sheet separator-feeder with sheet stack levitation

Details Bottom sheet separator-feeder with sheet stack levitation Bottom sheet separator-feeder with sheet stack levitation

1997-10-14

1999-08-10

Skaggs, H. Grant

Sheet feeding or delivering

Feeding

Separators

271 35, 271146, 271166, B65H 316

Patent

active

059346620

ABSTRACT:
A bottom sheet feeding system for feeding individual image substrate sheets for reproduction apparatus out from under a stack of such sheets by intermittently feeding the bottom sheet out from under the overlying stack of sheets in a sheet stacking tray with a bottom sheet feeder, which may be electrostatic, while that stack of sheets is intermittently at least partially levitated relative to the bottom sheet to substantially reduce the gravitational force of the overlying stack of sheets normally bearing down on the bottom sheet to resist the separation and feeding of the bottom sheet out from under the rest of the stack. This intermittent stack levitation may be accomplished by appropriate cyclical transducer system forces applied to the bottom of the stacking tray at a frequency coordinated with intermittent feeding of the bottom sheet out from under the stack.

REFERENCES:
patent: 3357325 (1967-12-01), Eichorn et al.
patent: 3612512 (1971-10-01), Lang
patent: 3642362 (1972-02-01), Mueller
patent: 3717801 (1973-02-01), Silverberg
patent: 3976370 (1976-08-01), Goel et al.
patent: 4397459 (1983-08-01), Silverberg et al.
patent: 4526357 (1985-07-01), Kuehnle et al.
patent: 4955598 (1990-09-01), Hiroshige et al.
patent: 5026040 (1991-06-01), Gilbert
Xerox Disclosure Journal vol. 16, No. 2, Mar./Apr. 199, p. 81, "Ultrasonic Sheet Separation", by Martin, et al.

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