Advancing material of indeterminate length – With adherence or attraction of material to advancing means – By pneumatic pressure
Patent
1991-01-25
1993-01-05
Stodola, Daniel P.
Advancing material of indeterminate length
With adherence or attraction of material to advancing means
By pneumatic pressure
226196, 277DIG7, B65H 2012
Patent
active
051763052
ABSTRACT:
A device for controlling webs of material, for example photographic films of webs of paper or magnetic tapes, in a so-called twin roller hollow suction means is described, wherein a pressure difference exists between the upper and lower side of the web in the region of the pair of rollers and wherein a respective sealing wedge is arranged according to the invention in the free interior (10) between the rollers (2, 3) on either side outwardly from the outer roller edges such that it passes beneath the edges (17) of the suspended web portion (5), the cross-sectional shape of the rollers is imitated and is at a small distance from the bearing faces of the rollers. In a particularly preferred embodiment, the sealing wedge is hollowed in the shape of a tank and extends transversely to the direction of travel falling away in the direction of the web center (FIG. 3).
REFERENCES:
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Baarfusser Johann
Langer Lothar
Mannaberg Frank
Nentwich Reinhold
BASF Magnetics GmbH
Bowen P.
Stodola Daniel P.
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