Browse Prior Art Database

Actuator for Magnetic Disk Stack Access Arm

IP.com Disclosure Number: IPCOM000085706D
Original Publication Date: 1976-May-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 3 page(s) / 67K

Publishing Venue

IBM

Related People

Wanek, DJ: AUTHOR

Abstract

Actuator 20 utilizing only a single electric motor 22, is effective for moving an access arm 24 carrying an electrical transducer 26 either in direction A radially of a stack of magnetic disks 28 toward and away from the center 28a of the stack or else in the direction B parallel with the center 28a of the stack when access arm 24 is located outside of the peripheries of disks 28.

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Actuator for Magnetic Disk Stack Access Arm

Actuator 20 utilizing only a single electric motor 22, is effective for moving an access arm 24 carrying an electrical transducer 26 either in direction A radially of a stack of magnetic disks 28 toward and away from the center 28a of the stack or else in the direction B parallel with the center 28a of the stack when access arm 24 is located outside of the peripheries of disks 28.

Actuator 20 is composed of vertical guide rod 30, lead screw 32 drivingly connected to motor 22 which is preferably of the electrical stepping type, base casting 34 to which stepping motor 22 is fixed and with respect to which one end of rod 30 is attached, support casting 36 to which the other end of rod 30 is attached and rotatably mounting the end of lead screw 32 remote from motor 22, carriage 38 slidably disposed on rod 30, and a horizontal rod 40 carrying access arm 24 and slidably disposed within carriage 38.

Carriage 38 is provided with bushings 42 for slideably mounting carriage 38 on rod 30, and is provided with bushing 44 for providing easy longitudinal movement of rod 40 with respect to carriage 38. Lead screw nut 46 is rotatably disposed in and is carried by carriage 38 and has a threaded connection with lead screw 32. Nut 46 has tapered spaced fingers 47 on its lower end which surround lead screw 32, and a locking plate 48 has an internal surface 48a which is tapered similarly to the outer surfaces of the fingers 47 and is adapted to engage with the fingers 47.

Spring 50 forces plate 48 into locking engagement with fingers 47, and electric coil 52 is positioned below plate 48 and pulls plate 48 against the action of spring 50 out of engagement with fingers 47 and into to engagement with surface 38a of carriage 38, to thus in effect lock plate 48 to carriage 38.

Nut 46 is provided with a rubber tire 54 on its periphery, and...