Vacuum control for sheet applicator machines

Details Vacuum control for sheet applicator machines Vacuum control for sheet applicator machines

1979-01-16

1980-07-01

Saifer, Robert W.

Sheet feeding or delivering

Feeding

Separators

271 12, B65H 308

Patent

active

042103207

ABSTRACT:
A sheet applicator particularly suitable for bag-making machines comprises suction members controlled by a three-way valve to apply a vacuum to them at a sheet withdrawing station and atmospheric pressure when they have been reciprocated to a sheet releasing station. The valve comprises a first chamber communicating with atmospheric pressure and a second chamber of larger diameter than the first communicating with a source of vacuum, the chambers being alternately connected to the suction members by a valve plate displaceable between the chambers to close one of them and open the other. A spring acts on the valve plate with a force insufficient to displace it when it is closing the said second chamber but sufficient to hold it closed when it is closing the first chamber. Actual displacement of the valve plate is effected by a valve rod therefor striking abutments at the sheet withdrawing and sheet releasing stations.

REFERENCES:
patent: 1418145 (1922-05-01), Fischer
patent: 2591116 (1952-04-01), Backhouse
patent: 4002332 (1977-01-01), Hoenigmann

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