Browse Prior Art Database

Application of Position Sense Indicia to Flexible Disks

IP.com Disclosure Number: IPCOM000086097D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Kendall, FT: AUTHOR [+2]

Abstract

The illustrated fixture applies locating magnetic indicia to the periphery of floppy-type storage disks, which are to be utilized in a random-access multidisk file of the type disclosed in US Patent No. 3,936,880 to McGinnis et al. Such indicia, together with partial openings in the pack produced by an external air jet, are utilized in presently known fashion to quickly verify the address of an interface to be selectively expanded for storage transducing access. The expansion is accomplished, in the manner taught in the above-referenced patent, by reducing internal pressure between the disks from above a critical bistable threshold to below the threshold.

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Application of Position Sense Indicia to Flexible Disks

The illustrated fixture applies locating magnetic indicia to the periphery of floppy-type storage disks, which are to be utilized in a random-access multidisk file of the type disclosed in US Patent No. 3,936,880 to McGinnis et al. Such indicia, together with partial openings in the pack produced by an external air jet, are utilized in presently known fashion to quickly verify the address of an interface to be selectively expanded for storage transducing access. The expansion is accomplished, in the manner taught in the above-referenced patent, by reducing internal pressure between the disks from above a critical bistable threshold to below the threshold.

As shown in Figs. 1 and 2, the disk 1 to be marked is laid on the fixture 2 in a predetermined angular orientation determined by locating pins 3. The pins 3 fit through a ventilation opening 4 and central opening 5 in the disk 1. After the disk is mounted the fixture is moved (Fig. 3) against the resistance of spring 6, causing the disk 1 to positively contact the aligned bar magnet 7 supported on stationary frame 8. Guide plate 9 is elevated to provide "buckling" clearance for the disk 1, and thereby ensure positive contact between the disk and magnet 7 when the fixture is moved to the extreme position determined by stop collar 10.

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