Browse Prior Art Database

Clamping Device for Magnetic Diskettes

IP.com Disclosure Number: IPCOM000089582D
Original Publication Date: 1977-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Lightner, GE: AUTHOR [+2]

Abstract

In disk drives for recording or reading with respect to magnetic diskettes, such as the type disclosed in U. S. Patent 3,668,658, a mechanism is required to flatten and hold the diskette in the area of the diskette contacted by magnetic read/write heads. The clamping device includes a bail 10 carrying a pad 12 and a leaf spring 14 between the bail 10 and pad 12 for flattening and clamping the magnetic diskette 16 on a fixed platen 18.

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Clamping Device for Magnetic Diskettes

In disk drives for recording or reading with respect to magnetic diskettes, such as the type disclosed in U. S. Patent 3,668,658, a mechanism is required to flatten and hold the diskette in the area of the diskette contacted by magnetic read/write heads. The clamping device includes a bail 10 carrying a pad 12 and a leaf spring 14 between the bail 10 and pad 12 for flattening and clamping the magnetic diskette 16 on a fixed platen 18.

Bail 10 is pivoted about point 20, and may be actuated by any suitable power mechanism effective on a protruding finger 22 formed on bail 10. Guides 24 and 26 are fixed with respect to pad 12 and extend through spring 14 and bail 10 for locating pad 12 with respect to bail 10.

In operation, a diskette 16 is loaded between platen 18 and bail 10, and bail 10 is then rotated about point 20 toward diskette 16. Pad 12 contacts diskette 16, while bail 10 continues to travel for a short distance. This additional travel causes spring 14 to deflect, which flattens diskette 16 against platen 18.

A foam-rubber pad has previously been used in lieu of spring 14, and due to replacing the foam pad with leaf spring 14, advantageously the spring rate is not affected by change in the environment, the bail force is uniform due to the ability to design a flat spring rate into a leaf spring, and aging does not affect the rate of spring 14. In addition, the double action of spring 14 by its two opposite ends helps t...