Browse Prior Art Database

Variable Radius Air Bearing

IP.com Disclosure Number: IPCOM000078133D
Original Publication Date: 1972-Nov-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Baumann, GW: AUTHOR

Abstract

This unitary pressurized air bearing supports a web of magnetic tape, as it moves bidirectionally through a variable radius tape path.

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Variable Radius Air Bearing

This unitary pressurized air bearing supports a web of magnetic tape, as it moves bidirectionally through a variable radius tape path.

The air bearing is formed of a single housing having an internal wall 1 separating the housing into two pressure chambers 2 and 3. The housing has a uniform cross section, as shown in Fig. 2, and is slightly wider than the width of tape 4, for example, slightly wider than one-half inch. Chambers 2 and 3 include air bearing surfaces 5 and 6, respectively. Surfaces 5 and 6 provide a small and a large radius air bearing surface, respectively, and include a porous surface or hole pattern designed to support the tape on a cushion of air as it moves bidirectionally, as indicated by arrow 7.

An air-pressure source is connected to chamber 2 by conduit 8. Wall 1 is a porous wall or, alternatively, includes a pressure-dropping orifice 9 which meters the flow of air from chamber 2 into chamber 3. In this manner, a high pressure in chamber 2 supplies the small-radius portion 5 of the air bearing, and a lower pressure in chamber 3 supplies the large-radius portion 6 of the air bearing.

An air bearing of this type having more than two radii includes a number of internal walls 1 to provide a separate chamber for each radius. The chambers are then connected in air-flow series in the order of increasing radii.

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