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Vacuum and Pressure Regulators for Tape Drive

IP.com Disclosure Number: IPCOM000083323D
Original Publication Date: 1975-May-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Ho, R: AUTHOR [+2]

Abstract

In a magnetic tape drive, it is desirable to use a pressure regulator to regulate pressure applied to air bearings irrespective of the pressure at an air pressure supply. Similarly, in the tape drive it is desirable to regulate the vacuum in vacuum columns, irrespective of changes in the vacuum at the vacuum source. Changes in the pressure supply and vacuum source are most often caused by environmental changes, one example of which is the difference in barometric pressure as caused by weather variations or changes in altitude.

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Vacuum and Pressure Regulators for Tape Drive

In a magnetic tape drive, it is desirable to use a pressure regulator to regulate pressure applied to air bearings irrespective of the pressure at an air pressure supply. Similarly, in the tape drive it is desirable to regulate the vacuum in vacuum columns, irrespective of changes in the vacuum at the vacuum source. Changes in the pressure supply and vacuum source are most often caused by environmental changes, one example of which is the difference in barometric pressure as caused by weather variations or changes in altitude.

Shown in Fig. 1 is a pressure regulator and in Fig. 2 a vacuum regulator. In Fig. 1 slug 10 rides in closed cylindrical chamber 12.

The bottom of slug 10 is hollow and contains throttle holes 14. The throttle portion of slug 10 rides on lip 16 when the regulator is inactive.

The function of pressure regulator 10 is to maintain the pressure at the load (air bearings in a tape drive) constant, irrespective of variations in air pressure at the source. Air pressure from the source enters port 20. As the pressure in the source goes up, it tends to lift slug 10 upwards in hollow chamber 12. Chamber 12 is maintained substantially at atmospheric pressure because of vents 22 that ring the walls of chamber 12.

As slug 10 moves up, it pulls the throttle portion with it so that throttle holes 14 close down the opening from pressure source port 20 into load port 18. Accordingly, the pressure at the load rema...