Browse Prior Art Database

Record Disk Selection

IP.com Disclosure Number: IPCOM000084956D
Original Publication Date: 1976-Feb-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Griffiths, DE: AUTHOR [+2]

Abstract

Record storage apparatus having a plurality of spaced-apart, coaxial, commonly rotating, record storage disks are accessed via an axially enlarged access opening by a radially inwardly moving head carried by a suitable carriage. The access opening is generated from a tubular support spindle by altering airflow from the spindle to the outer peripheral portion. That is, blocking airflow by an axially movable piston inside the support spindle causes record storage disks in area A to axially move toward each other, while record disks in other portions of the stack of disks remain evenly spaced apart. To ensure access opening occurs at the right disk location, a plurality of air jets in the piston provides momentary pulses of air at the access opening desired axial position.

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Record Disk Selection

Record storage apparatus having a plurality of spaced-apart, coaxial, commonly rotating, record storage disks are accessed via an axially enlarged access opening by a radially inwardly moving head carried by a suitable carriage. The access opening is generated from a tubular support spindle by altering airflow from the spindle to the outer peripheral portion. That is, blocking airflow by an axially movable piston inside the support spindle causes record storage disks in area A to axially move toward each other, while record disks in other portions of the stack of disks remain evenly spaced apart. To ensure access opening occurs at the right disk location, a plurality of air jets in the piston provides momentary pulses of air at the access opening desired axial position.

For accurately positioning the piston and the air jets for reliably generating an access opening, the piston is made nonrotatable and is suitably supported either in a cantilevered or suspended manner inside the tubular spindle. A light source carried by the carriage supplies light through the interstices between adjacent record storage disks. The tubular spindle has a radial port intermediate each record disk for passage of air.

The light from the source passes through these radial ports and impinges upon a mask having a pitch equal to the pitch of the annular washer/spacers supporting the record disks. A suitable photosensor disposed behind the mask senses light/dark areas...