Browse Prior Art Database

Disk Drive with Synchronous Head Tracking

IP.com Disclosure Number: IPCOM000085530D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Porter, TH: AUTHOR [+2]

Abstract

The drive includes gearing 3 for connecting the drive arbor la with the carrier 2 for a magnetic transducer 10, so that transducer 10 makes a spiral track 9a over the surface of disk 9.

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Disk Drive with Synchronous Head Tracking

The drive includes gearing 3 for connecting the drive arbor la with the carrier 2 for a magnetic transducer 10, so that transducer 10 makes a spiral track 9a over the surface of disk 9.

Arbor la constitutes the output shaft of motor 1 which is preferably of the electrical stepping type, and disk 9 is fixed at its center by any suitable means to arbor la. Motor 1 is mounted on a printed-circuit card 6, and electrical components 8 connected with transducer 10 as well as electric plugs 7 are mounted on circuit card 6.

Gearing 3 includes spur gears 3a and 3b rotatably mounted on studs 3c and 3d that are fixed on card 6. Pinion gears 3e and 3f are, respectively, fixed with respect to motor shaft 1a and gear 3a and pinion gears 3e and 3f mesh, respectively, with gears 3a and 3b.

Arm 2 is fixed on gear 3b and overlies the upper surface of disk 9 so that transducer 10 is in contact with the upper surface of disk 9. Spring 4 is connected to arm 2 for taking up any lost motion in gearing 3. Microswitches 5 and 5a are fixed at the opposite ends of the travel of carrier 2, for indicating when carrier 2 has reached either of its limits of travel.

The ratios of gears 3a, 3b, 3e and 3f are so chosen that head 10 always follows the same spiral track 9a across disk 9 as the disk is driven from motor 1. Spring 4 takes up all backlash in gearing 3, thus enabling head 10 to follow track 9a in either rotational direction of disk 9. Motor 1 is...