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Eliminating Wobble in a Flexible Disk Pack

IP.com Disclosure Number: IPCOM000083578D
Original Publication Date: 1975-Jun-01
Included in the Prior Art Database: 2005-Mar-01
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Barbeau, RA: AUTHOR [+2]

Abstract

Apertured flexible disks are assembled in a file (or pack) subassembly of hundreds of disks, by alternately stacking flexible storage disks and short-diameter spacer elements on a retaining plate connected with means for holding the disks. A second retaining plate is placed over the completed stack and the subassembly is clamped centrally as a unit.

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Eliminating Wobble in a Flexible Disk Pack

Apertured flexible disks are assembled in a file (or pack) subassembly of hundreds of disks, by alternately stacking flexible storage disks and short- diameter spacer elements on a retaining plate connected with means for holding the disks. A second retaining plate is placed over the completed stack and the subassembly is clamped centrally as a unit.

In operation the subassembly is rotated as a unit with the axis horizontal, and air is circulated centrally through the aligned disk apertures and radially through the spacers. The circulating air is used to stabilize the rotation of the disks.

In the rotating subassembly the unrestrained peripheral edges of the disks trace irregular paths (wobble), due to stresses imposed by the clamping procedure. This condition may be corrected by using the following clamping procedure.

The disks are stacked and clamped as explained above and the clamped subassembly is placed in a nonrotating holding fixture with the axis horizontal. Air under pressure is supplied to the interior space formed by the disk apertures and circulated via the spacers through spaces between the nonrotating disks.

While air is being circulated in this manner, the clamping force is released and then reapplied. During the release the circulating air straightens the disks and spacers relieving the bending stresses caused by the initial clamping, and the subassembly retains its nonstressed condition when it is reclam...