Device to stabilize a notched web in a vacuum box

Details Device to stabilize a notched web in a vacuum box Device to stabilize a notched web in a vacuum box

1989-12-04

1990-07-17

Levy, Stuart S.

Advancing material of indeterminate length

Plural material-moving means

And intermediate storage

226 97, 242182, B65H 2024, G11B 1558

Patent

active

049416065

ABSTRACT:
In a conventional vacuum box a loop of a web material is received in an elongate chamber of the box, and a vacuum at the lower portion of the chamber draws air through the chamber to hold the loop of web material under tension as it moves through the chamber. When the web has one or more notches along a side edge thereof, the web may vibrate excessively and experience a drop in web tension as the notch passes through the bottom of the loop in the box. In order to avoid this problem an endless ring of flexible material is positioned in the vacuum box and within the loop of web material. The ring has a plurality of spaced openings around the circumference of the ring, and they are offset from the side edges of the ring so that the portion of the ring adjacent the openings will cover the notches in the web as the web passes through the bottom of the loop in the vacuum box, thus avoiding the excessive vibration in the web and loss in web tension mentioned above.

REFERENCES:
patent: 2927789 (1960-03-01), Walsh et al.
patent: 2990990 (1961-07-01), Wilkins et al.
patent: 3330557 (1967-07-01), Young
patent: 3807612 (1974-04-01), Eggert
patent: 3871597 (1975-03-01), LaMers
patent: 3883060 (1975-05-01), Scarpa
patent: 3948425 (1976-04-01), Bala
patent: 4218026 (1980-08-01), Stange
patent: 4477822 (1984-10-01), Luoma et al.
patent: 4760946 (1988-08-01), Bassa

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