Vacuum system control

Details Vacuum system control Vacuum system control

1974-02-22

1976-03-30

Schacher, Richard A.

Advancing material of indeterminate length

With material-responsive control means

To regulate longitudinal movement of material

226 43, 226 45, 226195, B65H 2318

Patent

active

039469204

ABSTRACT:
A control system for one or more vacuum holddown devices for use in an apparatus employing flexible web material in a flattened condition. A plurality of perforated plenums are joined to a manifold connectible to a vacuum producing means. The pressure within the manifold is sensed and must be at a predetermined pressure before the drive system for the web material is activated thereby preventing bulging or buckling of the web material during startup and normal running of the material.

REFERENCES:
patent: 3302900 (1967-02-01), Messamer
patent: 3310249 (1967-03-01), Bryer
patent: 3741116 (1973-06-01), Green

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