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Accessing Mechanism for a Stack of Magnetic Disks

IP.com Disclosure Number: IPCOM000082686D
Original Publication Date: 1975-Jan-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Elliott, JF: AUTHOR [+3]

Abstract

A single electric motor 66, preferably of the stepping type, is connected by clutches 68 and 70 for pivoting a magnetic access arm 72 into a stack of rotatable magnetic disks 74, and for preliminaries moving a carriage 60 carrying arm 72 alongside of the stack of disks 74, so that arm 72 may enter between a particular desired pair of the disks 74.

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Accessing Mechanism for a Stack of Magnetic Disks

A single electric motor 66, preferably of the stepping type, is connected by clutches 68 and 70 for pivoting a magnetic access arm 72 into a stack of rotatable magnetic disks 74, and for preliminaries moving a carriage 60 carrying arm 72 alongside of the stack of disks 74, so that arm 72 may enter between a particular desired pair of the disks 74.

Carriage 60 slides on a fixed shaft 80 extending parallel with the axis of the stack of disks 74 and also slides with respect to a fixed lead screw 50. Access arm 72 is rotatably mounted with respect to carriage 60, and clutch 70 connects one end of motor 66 with the access arm for swinging arm 72 about its pivot.

Carriage 60 embraces a carriage 52 which is rotatable about fixed lead screw
50. Carriage 52 carries a roll 54 having an external thread 54a engageable with the threads on lead screw 50, a bearing roll 56 disposed at about 120 degrees about the center of screw 50, with respect to roll 54, and a spring pressed roll 82 for maintaining rolls 54 and 56 in engagement with screw 50. Gears 58 and 84 are fixed to carriage 52, and gears 62 and 64, respectively, mesh with gears 58 and 84. Gears 64 and 62 are selectively driven from the lower end of motor 66 by the two-position clutch 68.

With access arm 72 being out-of-line with respect to disks 74, carriage 60 and arm 72 are moved in a direction parallel with the axis of rotation of disks 74, by engaging clutch 68 in ei...