Apparatus for separating and conveying the uppermost sheet of a

Details Apparatus for separating and conveying the uppermost sheet of a Apparatus for separating and conveying the uppermost sheet of a

1986-03-12

1988-07-26

Skaggs, H. Grant

Sheet feeding or delivering

Feeding

Separator and conveyor

271107, 271 93, B65H 510

Patent

active

047595370

ABSTRACT:
In order to be able in a simple manner to supply one or more suction pick devices periodically moved relative to the surface of a stack with driving energy, the suction pick-up device is connected to an air volume or source having substantially constant negative pressure over overpressure, and a valve assembly that periodically connects the suction pick-up device to the outside air. The valve assembly is incorporated in the connecting line between the suction pick-up device and the air volume. The valve assembly may be embodied with a control piston that is subject to the action of a restoring force, by a pneumatic multi-way valve having a regulattable frequency, or by a magnetic valve connected to a regulattable frequency generator. With the aid of a regulating device for the cross section of the vent opening, it is possible to generate an amplitude of the suction pick-up device movement that becomes progressively smaller from stroke to stroke after the movable suction pick-up device has been switched on, until it attains a complete standstill.

REFERENCES:
patent: 2163274 (1939-06-01), Dixon
patent: 3764133 (1973-10-01), Gray et al.
patent: 4146217 (1979-03-01), Barker et al.
patent: 4327906 (1982-05-01), Frohlich et al.
patent: 4591140 (1986-05-01), Illig et al.

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