Air bladder apparatus for positioning a magnetic head

DETAILED DESCRIPTION I claim: 1.
A magnetic head load-unload device for use with an actuator in the recording and reading of information on a magnetic disk, comprising, a support arm, means for suspending a transducer from said support arm, a transducer coupled to said suspension means, said transducer having a load position and an unload position relative to said support arm, movement of said transducer from said unload position to said load position having the effect of placing to said load position having the effect of placing the transducer in data transfer engagement with a magnetic disk, biasing means for exerting a force with relation to said suspension means in a manner to urge said transducer into one of said load and unload positions, an elastically expandable pneumatic bladder operatively coupled to said biasing means such that expansion of said pneumatic bladder provides a of said pneumatic bladder providing a force to overcome said biasing means, thereby moving said transducer to the other of said load and unload positions, and gas supply means for selectively inflating said pneumatic bladder.
2.
The device of claim 1 wherein said biasing means exerts a force to urge said transducer into an unload position and expansion of said pneumatic bladder provides a load force sufficient to overcome the force of said biasing means.
3.
The device of claim 1 wherein said transducer is a first transducer and said bladder is a first pneumatic bladder said device further comprising a second pneumatic bladder and a second transducer pivotally attached to said support arm and biased into an unload position relative to said support arm, said second transducer having an orientation opposite the orientation of said first transducer, said second pneumatic bladder in transition transfer engagement with said second transducer.
4.
The device of claim 1 wherein said biasing means is a return spring.
5.
The device of claim 1 wherein said transducer is fixed to a resilient suspension flexure attached to said support arm, said resilient suspension flexure having an elasticity to maintain a predetermined gram load force on said magnetic disk when said transducer is in a load position