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Bimetallic Mechanism for Loading and Unloading Magnetic Heads

IP.com Disclosure Number: IPCOM000051642D
Original Publication Date: 1981-Feb-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Dreyfus, RW: AUTHOR [+2]

Abstract

This mechanism includes bimetallic suspension 10 on which magnetic hea 12 is fixed for the purpose of loading and unloading head 12 with respect to magnetic disk 14.

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Bimetallic Mechanism for Loading and Unloading Magnetic Heads

This mechanism includes bimetallic suspension 10 on which magnetic hea 12 is fixed for the purpose of loading and unloading head 12 with respect to magnetic disk 14.

Disk 14, which may be of the rigid type, is rotatably disposed on axis 16. Suspension 10 includes layers 10a and 10b which are fixed together and which have different temperature coefficients of expansion. Head 12 is fixed to the lower surface of layer 10b either directly or with the use of a suitable flexible trunnion (not shown), allowing pivotal movement of head 12 with respect to layer 10b. Layers 10a and 10b are heated electrically by the application of an emf from battery 18 controlled by switch 20.

Head 12 may be unloaded with respect to disk 14, as shown in Fig. 1, by closing switch 20 which allows current to flow through layers 10a and 10b, heating these layers. Suspension 10 will then be arced upwardly so as to withdraw head 12 from close proximity to disk 14. Head 12 may be moved into operative relationship with respect to disk 14 so as to be in close proximity to disk 14, preferably with a flying height above disk 14, by opening switch 20 which allows layers 10a and 10b to cool to ambient temperature. Suspension 10 then straightens, as shown in Fig. 2, and moves head 12 into operative relationship with respect to disk 14.

Alternately, suspension 10 may be so arranged that head 12 is held in operative relationship with respect t...