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Tape Lifter for Rotating Head Tape Recorder

IP.com Disclosure Number: IPCOM000084978D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Hauke, FE: AUTHOR [+3]

Abstract

In Fig. 1, the pneumatic tape lifter is blowing a wave 22 in tape 10 to lift the tape from head 18. Tape lift is activated during nonread/write times. Tape 10 is helically wrapped about the mandrel 12 and is moving continuously or incrementally about the mandrel, as depicted by arrow 14. Mandrel 12 is preferably an air bearing mandrel. In the middle of the mandrel 12 mounted coaxially with the mandrel is a rotor 16 carrying the magnetic head 18. Magnetic head 18 is moving against the direction of motion of the tape 10, as shown by the dashed arrow 20.

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Tape Lifter for Rotating Head Tape Recorder

In Fig. 1, the pneumatic tape lifter is blowing a wave 22 in tape 10 to lift the tape from head 18. Tape lift is activated during nonread/write times. Tape 10 is helically wrapped about the mandrel 12 and is moving continuously or incrementally about the mandrel, as depicted by arrow 14. Mandrel 12 is preferably an air bearing mandrel. In the middle of the mandrel 12 mounted coaxially with the mandrel is a rotor 16 carrying the magnetic head 18. Magnetic head 18 is moving against the direction of motion of the tape 10, as shown by the dashed arrow 20.

With the tape lifter in operation, a wave 22 extending across the entire width of the tape 10 in the vicinity of the head 18 is created. This wave 22 propagates along the tape about the mandrel 12 as the rotating head 18 moves. The tape lifter about head 18 creates the wave and the wave moves with the head. In effect, a local tape lift in the immediate vicinity of the head is provided, while the rest of the tape 10 remains at its normal air bearing height above the surface of the mandrel 12 and the rotor 16.

The wave 22 is created by the air being forced up around head 18. This extra air produces a pneumatic chimney as it moves toward the edge of the tape 10.

In Fig. 2, a portion of the air bearing rotor 16 is shown with a slotted spherical head 18 mounted therein. A hydrostatic air bearing for the rotor 16 is provided by air flow through holes 24 in the surface of the rot...