Rotary inertia latch for latching a rotary actuator in a disk dr

Details Rotary inertia latch for latching a rotary actuator in a disk dr Rotary inertia latch for latching a rotary actuator in a disk dr

1994-12-20

1996-06-18

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

G11B 554, G11B 2122

Patent

active

055284370

ABSTRACT:
A shock resistant disk drive has a balanced rotary actuator and a disk assembly rotatably mounted to its base. The rotary actuator is latched with its transducer in a parked position relative to the disk assembly, by a monostable balanced rotary inertia latch, also rotatably mounted to the base, which in its monostable latched position is torque coupled in torque opposition to said rotary actuator in parked position. The balanced rotary actuator and the balanced rotary inertia latch, being rotatably mounted to the base, respond to rotary shock in the same rotational sense. The moment of inertia of the balanced rotary inertia latch and the ratio of the opposed torque moment arms in the torque couple are chosen so that in the presence of rotary shock on said base, rotation of said balanced rotary actuator relative to said base and rotation of said balanced rotary inertia latch relative to said base, is zero. A permanent magnet bias is employed to retain the balanced rotary inertia latch in monostable latched position. When the disk assembly is at operating speed and the transducer is stabilized in flight on the disk air bearing, the balanced rotary inertia latch is electromagnetically biased to its unlatched position, in which position the inertia latch is clear of the balanced rotary actuator.

REFERENCES:
patent: 5208713 (1993-05-01), Lindsay
patent: 5296986 (1994-03-01), Morehouse et al.

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