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Device for Detecting Different Diskettes

IP.com Disclosure Number: IPCOM000082523D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Steele, SG: AUTHOR [+2]

Abstract

Plunger 5 pivotally mounted with respect to cover 7 of the illustrated disk drive, differentiates between the diskette 1 having the opening 3 therethrough through which plunger 5 may move and the diskette 2 having no such opening therethrough.

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Device for Detecting Different Diskettes

Plunger 5 pivotally mounted with respect to cover 7 of the illustrated disk drive, differentiates between the diskette 1 having the opening 3 therethrough through which plunger 5 may move and the diskette 2 having no such opening therethrough.

The two diskettes 1 and 2 are physically identical, and each has a magnetic disk 15 rotatably disposed in a square containing envelope 18. It is assumed that the disk 15 in one of the diskettes 1 and 2 may have both of its sides read or written upon, while the disk 15 in the other of the diskettes 1 and 2 may have only side read or written upon.

The diskette 1 or 2 is inserted in the disk drive as shown in Fig. 2, being dropped into opposite slots 16 provided in frame 11. Disk 15 is then gripped between opposing rotatable parts, not shown, to be drivingly rotated, and a magnetic head, not shown, extending through one or both slots 17 then reads or writes upon disk 15 after cover 7 has been swung about its pivot 8 in direction A to closed position.

Plunger 5 is attached onto plate 4 which is pivoted at 19 with respect to cover
7. Spring 6 extends between cover 7 and plate 4, making spring 6 and parts 4 and 7 an overcenter device 20.

In operation, overcenter device 20 is normally extended, with plate 4 and plunger 5 being pivoted clockwise with respect to cover 7 as seen in Fig. 2, when cover 7 is in the open position. Depending on the particular type of diskette (1 or
2) inserted, whe...