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Browse Prior Art Database

Splitter Blade for Flexible Disk Pack

IP.com Disclosure Number: IPCOM000082510D
Original Publication Date: 1974-Dec-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 62K

Publishing Venue

IBM

Related People

McGinnis, BW: AUTHOR [+2]

Abstract

A pack of corotating closely spaced floppy type storage disks is opened for transducing access (while rotating) by an aerodynamically shaped blade. Blade shape and angle of approach to the disk surface at the separation interface have varying effect on the disks. After repeated (e.g., several thousand) deflections, burnishing may appear at the outer edge of the contacted disk.

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Splitter Blade for Flexible Disk Pack

A pack of corotating closely spaced floppy type storage disks is opened for transducing access (while rotating) by an aerodynamically shaped blade. Blade shape and angle of approach to the disk surface at the separation interface have varying effect on the disks. After repeated (e.g., several thousand) deflections, burnishing may appear at the outer edge of the contacted disk.

The burnishing problem can be greatly reduced by a blade designed and used as follows. A spear-shaped blade 1 is cut from a section of a thin stainless steel cylinder (Fig. 1) or, even preferably, a cone. The tip 3 is thinned further to allow for contact-free entrance between the closely spaced but not touching disks
6. The leading edge 5 is polished and blended to produce a smooth transition to the tip for gradual engagement with the disks 6.

The blade 1 is mounted (Figs. 2-4) with its tip 3 three-quarters of an inch above the horizontal radius of the disks 6 and its leading edge 5 approximately 60 degrees to the same radius (Fig. 2). It is canted approximately 8 degrees counterclockwise (Fig. 4) relative to the plane of rotation of the undeflected disks, and its hydrodynamic bearing surface 7 is rotated approximately 7 degrees relative to the same plane of disk rotation (Fig. 3).

This construction provides a gradual deflection of the disks 6 at the selected interface (to the right as viewed in Figs. 3, 4), with the deflected disk load uniformly distri...