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Access Opening Arrangement for Flexible Disk Pack

IP.com Disclosure Number: IPCOM000085858D
Original Publication Date: 1976-Jun-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 63K

Publishing Venue

IBM

Related People

Orlando, AW: AUTHOR

Abstract

Multiple flexible disks held uniformly spaced in a rotating pack, at spacing intervals too small for recording access, are separated for access by flexing the pack at a desired access position. The air pressure between the unflexed disks may be controlled to produce a bistable effect, by which the pack can be flexed open at any position in response to a transient force and maintain a stable rotational configuration.

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Access Opening Arrangement for Flexible Disk Pack

Multiple flexible disks held uniformly spaced in a rotating pack, at spacing intervals too small for recording access, are separated for access by flexing the pack at a desired access position. The air pressure between the unflexed disks may be controlled to produce a bistable effect, by which the pack can be flexed open at any position in response to a transient force and maintain a stable rotational configuration.

The illustrated flexible disk pack utilizes disks D having concentrically configured cuts for improved flexibility, as described in the IBM Technical Disclosure Bulletin, Vol. 19, No. 1, June 1976, page 171. The pack can be opened for access in the bistable mode utilizing inertial pressure differences as described below.

The disks D are separated by not shown smaller diameter permeable spacers allowing for centrifugal circulation of air. The disks and spacers are stacked on hollow spindle S in an alternating sequence and clamped at the hub by nut 1. Spindle S has openings SO for circulating air to the spacers. The assembly is confined between corotating end plates 2, 3. Plate 3 is arranged to be axially shiftable relative to the disks D by a fast-acting actuator mechanism, not shown. Air is circulated through the spindle openings and spacers into the interdisk spaces. The pressure is controlled for bistable mode operation while the disks are rotated in unflexed orbits.

The schematically illustrated tri...