Device for discharging sheets from the bottom of a stack

Details Device for discharging sheets from the bottom of a stack Device for discharging sheets from the bottom of a stack

1990-03-27

1991-09-24

Olszewski, Robert P.

Sheet feeding or delivering

Feeding

Separators

271 99, 271104, B65H 312

Patent

active

050508539

ABSTRACT:
A pneumatic sheet separating device is provided whereby sheets in a holder can be discharged one by one from the bottom of a stack and wherein the holder is provided with a carrier and lateral supports. The carrier is permanently bent or depressed transversely of the direction of sheet transport such that it is nonplanar. In the vicinity of the deepest part of the bend or depression, the carrier is preferably provided with at least one aperture beneath at least one edge zone of a side edge of the stack of sheets in the holder, wherein a partial vacuum can be created so that the bottom sheet is sucked against the carrier. An air duct is also provided to blow air against the side edge of the stack, as considered with respect to the direction of sheet transport, to create a layer of air at least between the bottom sheet and the stack thereabove. Preferably the air duct is disposed so that the air flow is blown out over the deepest part of the carrier causing the friction between the bottom sheet which is to be discharged and the stack thereabove to be reduced. At the instant that the layer of air forms between the bottom sheet and the stack thereabove, the bottom sheet is discharged by a transport belt.

REFERENCES:
patent: 2812178 (1957-11-01), Hagren
patent: 3099442 (1963-04-01), Wendricks et al.
patent: 3782716 (1974-01-01), Long et al.
patent: 3947018 (1976-03-01), Stange
patent: 4014537 (1977-03-01), Stange
patent: 4462586 (1984-07-01), Browne et al.
patent: 4579330 (1986-04-01), Lehmann
patent: 4616815 (1986-10-01), Vijuk
patent: 4728091 (1988-03-01), Couwenberg
patent: 4887805 (1989-12-01), Herbert et al.

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