Browse Prior Art Database

Pneumatic Control of Magnetic Recorder Gap

IP.com Disclosure Number: IPCOM000097576D
Original Publication Date: 1961-Mar-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Rutter, DE: AUTHOR

Abstract

The separation of magnetic recorder head 10 from the surface of movable magnetic drum 11 is maintained constant by use of air pressure variable to accommodate variations in the surface of drum 11. Magnetic device 10 is mounted on a block 12 which pivots about shaft 13. One or more orifices 14 in the face of 12, proximate the surface of drum 11 connects with an inner air chamber 15. Air is supplied at constant pressure to chamber 15 by pump 16 connected through pipe 17 to expansible bellows 18 connected to chamber 15 by pipe 19.

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Pneumatic Control of Magnetic Recorder Gap

The separation of magnetic recorder head 10 from the surface of movable magnetic drum 11 is maintained constant by use of air pressure variable to accommodate variations in the surface of drum 11. Magnetic device 10 is mounted on a block 12 which pivots about shaft 13. One or more orifices 14 in the face of 12, proximate the surface of drum 11 connects with an inner air chamber 15. Air is supplied at constant pressure to chamber 15 by pump 16 connected through pipe 17 to expansible bellows 18 connected to chamber 15 by pipe 19.

Bracket 20 is connected to stationary frame member 21 to hold pipe 17 and one side of bellows 18 fixed. Air pressure applied from jet 14 to surface 11 sets the spacing of 10 from that surface. A change in the surface which tends to modify the gap between the surface of 12 and 11 affects the pressure at orifice
14. Pressure change at 14 is reflected inversely at bellows 18. A mechanical expansion or contraction in accordance with the change in pressure at the orifice thus compensates for the variation in the gap. This device is particularly suitable for use where the rate of travel of the surface of 11 is such that laminar air flow is not effective to retain 10 a fixed distance from the drum surface.

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