Winding – tensioning – or guiding – Tension control or brake – Supply controlled
Patent
1996-11-07
1998-09-08
Walsh, Donald P.
Winding, tensioning, or guiding
Tension control or brake
Supply controlled
2424193, 226 972, 2261181, B65H 2030
Patent
active
058033920
ABSTRACT:
A vacuum box (38) is provided with recesses (86, 88, 90, 92) on the inner surfaces (74, 76) of its front and/or back walls (40, 42) along at least two of its interior corners (78, 80, 82, 84); so that, the pressures on opposite sides of the incoming and outgoing spans (64.sub.i, 64.sub.o) of the web (50) are substantially equalized at discrete locations along the lengths of the spans, whereby differential pressure applied to the central curved loop (64) between the spans causes the incoming and outgoing spans to remain substantially out of contact with the side walls (40, 42). The side walls (44, 46) may be provided with chamfers (154, 156) at the interior corners or bores (158; 166-172) and ports (160-164; 174-180) to facilitate equalization of the pressure to facilitate equalizing the pressure on opposite sides of webs having a transverse curl toward a centerline of the box. The box may include web keepers (102) to retain the web during thread-up and a removable, sound insulated closure (130). A method of operating such a vacuum box is taught.
REFERENCES:
patent: 3112473 (1963-11-01), Wicklund et al.
patent: 3217956 (1965-11-01), Nejezchleb
patent: 3266691 (1966-08-01), Welsh
patent: 3499614 (1970-03-01), Badum
patent: 3568907 (1971-03-01), Watson
patent: 3633807 (1972-01-01), Williams
patent: 3754723 (1973-08-01), Meyer
patent: 3863863 (1975-02-01), Ende
patent: 4052022 (1977-10-01), Reijnhard
patent: 4093148 (1978-06-01), Urynowicz et al.
patent: 4113247 (1978-09-01), Phillips
patent: 4331306 (1982-05-01), Epina et al.
patent: 4399958 (1983-08-01), Dupont
patent: 5079569 (1992-01-01), Bunch, Jr.
C. Hawley, "Contoured Vacuum Column", IBM Tech. Discl. Bul., vol. 17, No. 9, Feb. 1975, p. 2567.
V. Nejezchleb, "Decreasing Tape Wear", IBM Tech. Discl. Bul., vol. 5, No. 2, Jul. 1962, p. 11.
Castrignano Frank
Lancy David Harold
Palone Thomas William
Bailey, Sr. Clyde E.
Eastman Kodak Company
Marcelo Emmanuel M.
Walsh Donald P.
LandOfFree
Vacuum box and method of operation for non-contact web transport does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Vacuum box and method of operation for non-contact web transport, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Vacuum box and method of operation for non-contact web transport will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1274696