Precision-surface with dynamically-stiff air film provided by de

Details Precision-surface with dynamically-stiff air film provided by de Precision-surface with dynamically-stiff air film provided by de

1974-12-16

1976-10-05

Knowles, Allen N.

Advancing material of indeterminate length

By fluid current

And web storage

226196, 308DIG1, B65H 1732

Patent

active

039840395

ABSTRACT:
A precision-surface is constructed to support magnetic tape on a dynamically-stiff air film above the surface. The precision-surface is achieved by using relatively thick stock material for the bearing. The bearing may be ground to the precise contour and dimensions for the desired tape path. A thin stiff air film between the bearing surface and the tape is provided by deep pools in the bearing surface. The bottom of each pool contains a single small hole in the order of 0.010 inch (0.254 mm.) in diameter for supplying air under pressure to the pool. The small holes are placed in the bottom of the pools preferably by using a thin foil with the holes etched therein and bonding the foil inside the rigid bearing so that the foil becomes the bottom of the pools. The total cross-sectional area of pools on the bearing surface is limited to a small percentage of the area of the bearing surface as the compressibility of the air in the pools can affect the stiffness of the air film.

REFERENCES:
patent: 2908495 (1959-10-01), Andrews et al.
patent: 3313462 (1967-04-01), Smith, Jr.
patent: 3485429 (1969-12-01), Hutzenlaub
patent: 3567093 (1971-03-01), Johnson
patent: 3649381 (1972-03-01), Mayhew
patent: 3761002 (1973-09-01), Baumann et al.

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