Browse Prior Art Database

Disk Selecting Piston

IP.com Disclosure Number: IPCOM000088597D
Original Publication Date: 1977-Jul-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Griffiths, DE: AUTHOR [+3]

Abstract

In a storage apparatus having a stack of flexible disks, it ~s desired to efficiently select a disk for recording or transducing access by axially moving an adjacent disk away from the disk to be recorded upon. This is done by a combination of pressure and vacuum changes in the stack of disks immediately adjacent the disk to be accessed.

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Disk Selecting Piston

In a storage apparatus having a stack of flexible disks, it ~s desired to efficiently select a disk for recording or transducing access by axially moving an adjacent disk away from the disk to be recorded upon. This is done by a combination of pressure and vacuum changes in the stack of disks immediately adjacent the disk to be accessed.

A piston is axially movably disposed inside a tubular spindle. The tubular spindle supports a plurality of record storage disks and consists of a plurality of laminated spacers each having an air passage for movement of air radially outwardly or inwardly from between adjacent ones of the record storage disks. The front wall of the piston is placed adjacent a disk to be accessed. Then, to select a disk, pressurized air is first applied through a pressure tube to flow radially outwardly through the jet ports adjacent selected air passages. The jet of air flowing outwardly thereof initiates partial axial movement of disk B from adjacent disk A. Then, after the jet of air is established. a vacuum (radial inward airflow) is induced through the vacuum tube via a small annular plenum formed between the piston and an inner surface of the tubular spindle. Four holes are placed between the vacuum tube and the annular plenum for ensuring good airflow for symmetrical axial movement of disk B. The second jet port adjacent the rear wall provides axial separation of disk C from disk D.

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