Browse Prior Art Database

Single Motor Drive

IP.com Disclosure Number: IPCOM000046906D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Zell, MN: AUTHOR

Abstract

The figures illustrate a single motor system in a flexible disk drive that provides both the accessing function, where the head is driven by a 360Πcam, and the media drive function. Fig. 1 is a plan view and Fig. 2 is an elevation showing a DC motor 5 with an output shaft 6 which drives both an access cam 7 and the spindle 8 which carries the medium 9. As shown in Fig. 1, the head carriage 11 mounted to the base 12 by a pair of flexure springs 13, is moved to a desired track location by a 360Πcam 7. Motor shaft 6 drives the access cam 7 through a one-way clutch 15 and drives the spindle 8 through a second one-way clutch 16. The two clutches 15, 16 are assembled 180Πout of phase such that when the DC motor 5 drives access cam 7, the one-way clutch 15 driving spindle 8 is in its free-wheel mode, thus not driving the spindle.

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Single Motor Drive

The figures illustrate a single motor system in a flexible disk drive that provides both the accessing function, where the head is driven by a 360OE cam, and the media drive function. Fig. 1 is a plan view and Fig. 2 is an elevation showing a DC motor 5 with an output shaft 6 which drives both an access cam 7 and the spindle 8 which carries the medium 9. As shown in Fig. 1, the head carriage 11 mounted to the base 12 by a pair of flexure springs 13, is moved to a desired track location by a 360OE cam 7. Motor shaft 6 drives the access cam 7 through a one-way clutch 15 and drives the spindle 8 through a second one-way clutch
16. The two clutches 15, 16 are assembled 180OE out of phase such that when the DC motor 5 drives access cam 7, the one-way clutch 15 driving spindle 8 is in its free-wheel mode, thus not driving the spindle. When the DC motor 5 is rotated in the opposite direction, driving the spindle, the access cam 7 does not rotate because its clutch 15 is in its free-wheel mode. A detent 18 on access cam 7 ensures the cam will not rotate when its clutch 15 is free-wheeling due to drag friction in the clutch. A read/write operation would be as follows. The DC motor 5 is rotated in the proper direction to engage access cam clutch 15 which drives access cam 7 and, in turn, drives the head carriage 11 to position it at the proper track location. The DC motor 5 is then reversed, driving spindle 8, and normal read/write operations can then oc...