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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.
English (United States)
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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...