Browse Prior Art Database

Flexible Disk Selections

IP.com Disclosure Number: IPCOM000088595D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Kleczkowski, SP: AUTHOR [+2]

Abstract

In storage apparatus employing stacked, flexible, coaxially rotating disks, an access opening for inserting a transducer to a record surface has to be created, for example, between disks 10 and 11. Among the controlling factors, which includes air flow control between the adjacent disks through radial slots in the supporting tubular spindle, jets of air from the selecting piston ensure that an access opening is precisely achieved between two selected disks. When an actuator for moving the piston axially of the tubular spindle includes a voice-coil actuator, supplying a jet pulse to the piston, this can cause it to axially move and thereby cause disk selection errors. Such errors can be eliminated by providing a neutralizer portion in addition to the feed portion of the jet supplying jet tube.

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Flexible Disk Selections

In storage apparatus employing stacked, flexible, coaxially rotating disks, an access opening for inserting a transducer to a record surface has to be created, for example, between disks 10 and 11. Among the controlling factors, which includes air flow control between the adjacent disks through radial slots in the supporting tubular spindle, jets of air from the selecting piston ensure that an access opening is precisely achieved between two selected disks. When an actuator for moving the piston axially of the tubular spindle includes a voice-coil actuator, supplying a jet pulse to the piston, this can cause it to axially move and thereby cause disk selection errors. Such errors can be eliminated by providing a neutralizer portion in addition to the feed portion of the jet supplying jet tube.

In one constructed embodiment, a jet air plenum was constructed at one axial end of the tubular spindle between an inner and an outer air seal. The jet tube had an orifice inlet disposed a predetermined distance from the axial extremity of the jet tube, which constitutes a neutralizer portion. The spacing of the jet tube between the inlet orifice and the piston constitutes a feed portion. Upon a jet of air entering the jet tube through the inlet, substantially equal and opposite impulse forces A and B are created. These forces substantially cancel each other. The size of the inlet is such that the neutralizer portion need not be as long as the feed p...