| 摘要 |
<p>Head positioning assembly (10) for use with a conventional disk drive (12). The assembly (10) is adapted to position the ready/write head (22) on a rotating diskette (21) and includes a locating disk (30) provided with a cardioid cam groove (32). A cam follower (46) rides within the cam groove (32) and thereby causes a carriage (40) to move radially between a pair of guide rods (42 and 44) to position the read/write head (22). The locating disk (30) is caused to rotate by selectively activating a solenoid (98) which causes an idler assembly (72) to contact the locating disk (32) with a moving idler belt (90). The idler belt (90) is indirectly powered by the same brushless DC motor (16) which powers the disk drive (12). A sensing subassembly (50) senses a zero position aperture (34) and a plurality of track position apertures (36) and acts in conjunction with external circuitry (600) and the solenoid (98) to control the rotation of the locating disk (30). When no rotation is desired the locating disk (30) is restrained by a brake pin (84) engaging one of a series of brake detents (39). The predominant usage of the present invention is in magnetic disk drives in the data processing industry.</p> |
