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A rectangular array of disk selection apertures in a tubular spindle enables pneumatic selection of disks for transducing access by combined axial and rotational piston motions.
English (United States)
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Disk Selection and Opening Using Two Degrees of Motion
A rectangular array of disk selection apertures in a tubular spindle enables
pneumatic selection of disks for transducing access by combined axial and
rotational piston motions.
Disk pack internal venting and selection technology to date makes use of
very narrow slits within the thickness of each disk pack spacer. The internal
selection piston travels axially and stops in front of each slit to inject a jet of air.
This technique has two drawbacks: one is the high position accuracy required for
the plunger to align with the chosen slit, and the other is excessive air leakage
since the walls of either the jet or spacer slits are thin.
This invention aims at resolving the deficiencies mentioned. It consists of
designing the spacers with removed, or partially removed, portions such that
when they are stacked, they present on the inside diameter an array of ports of
which a small subset (4 or 6) deliver air between two particular disks; such ports
connect to the disk interstice via serpentine passageways in the tubular spindle.
Selection of a disk consists of choosing a circular row of ports within the
circumferential array and then a set of circumferentially spaced-apart ports within
that row. A piston with two concentric sleeves is used to perform the selecting.
To select a disk, the full piston moves until the chosen row is reached. Then, the
two sleeves are decoupled, and the inner sleeve makes another move to...