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Random Access Tape Storage with Constant Access Time

IP.com Disclosure Number: IPCOM000086075D
Original Publication Date: 1976-Jul-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Rausch, F: AUTHOR

Abstract

This magnetic storage consists of an endless magnetic tape or flat wire 1 helically wound around two drums 2, 3. As shown in Fig. 1, the last winding of the tape or wire on drum 2 is connected to the first winding on this drum via pulleys 4, 5. Drum 3 is driven by motor 6. Endless wire 1 is arranged in 256 spaced windings, each of which forming 256 elongated track sections 7, 8 in an upper and a lower plane between the drums 2, 3.

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Random Access Tape Storage with Constant Access Time

This magnetic storage consists of an endless magnetic tape or flat wire 1 helically wound around two drums 2, 3. As shown in Fig. 1, the last winding of the tape or wire on drum 2 is connected to the first winding on this drum via pulleys 4, 5. Drum 3 is driven by motor 6. Endless wire 1 is arranged in 256 spaced windings, each of which forming 256 elongated track sections 7, 8 in an upper and a lower plane between the drums 2, 3.

Each track section 7 is accessible by lifting the respective wire into contact with magnetic read/write head 9 common to all or at least a number of wires and arranged at a distance to the plane of track sections 7. A similar magnetic head 10 may be arranged on the opposite side to be contacted by lifting track section 8 of a wire in the lower plane.

Wire sections 7 pass through channels 11 of selection device 12. Each channel 11 contains a U-shaped selection foil 13 (Figs. 2, 3) having loops 14 on the edges of its legs 15 to carry wire section 7.

Each foil 13, locked in its inoperative position under the tension of springs 16, is provided with recesses 17, 18 which by their shape (17 = 1, 18 = 0) represent a binary code. There are eight recesses representing 256 binary values in each foil 13.

Associated with each recess is a selection rod 19, which is common to all selection foils 13 and which is adjustable to the respective binary values by driving means 20, so that at a given binar...