Browse Prior Art Database

Rifling Device

IP.com Disclosure Number: IPCOM000081569D
Original Publication Date: 1974-Jun-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

McGinnis, BW: AUTHOR

Abstract

Air directed in a laminar flow towards the periphery of a pack of corotating flexible magnetic storage discs, serves to create an opening at the pack position underlying the air nozzle. The air nozzle 1 (Figs. 1-3) comprises intake passage 2, plenum chamber 3, baffle 4 within chamber 3, restricting chamber 5 and exit orifice 6. The baffle 4 and restricting chamber 5 serve to provide a relatively laminar type of air flow from the orifice 6.

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Rifling Device

Air directed in a laminar flow towards the periphery of a pack of corotating flexible magnetic storage discs, serves to create an opening at the pack position underlying the air nozzle. The air nozzle 1 (Figs. 1-3) comprises intake passage 2, plenum chamber 3, baffle 4 within chamber 3, restricting chamber 5 and exit orifice 6. The baffle 4 and restricting chamber 5 serve to provide a relatively laminar type of air flow from the orifice 6.

For discs 7 (Figs. 4,5) approximately 0.0017'' thick and 12'' in diameter, a suitable orifice 6 would be 0.005'' wide and have a length of at least 2 or 3 inches parallel to the rotational path of the discs 7 (Fig. 4). As the orifice 6 is moved parallel to the axis of disc rotation in close proximity to the discs 7 (0.030- 0.060'' from the disc edges) air under slight pressure (for instance 2-3 psi) is directed through the nozzle 1 to the discs, causing a wedged shaped opening 8 (Fig. 4) to form in the adjacent disc interface. The opening 8 is aligned with the nozzle 1 and "moves" through the pack as the nozzle is moved over the pack. The width of this opening 8 is dependent upon the rate of rotation of the discs 7, the diameter and thickness of the aggregate disc pack, the air pressure applied, and the spacing of the discs (i.e., solid pack or spaced pack). Experimentally, a randomly positionable wedge approximately 0.125'' in width is formed in a pack of 300 discs, having the above-referenced dimensions (aggreg...