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Bi-Directional Rotary Actuator Inertial Latch with Magnetic Fringe Field Reset Feature

IP.com Disclosure Number: IPCOM000014538D
Original Publication Date: 1999-Dec-01
Included in the Prior Art Database: 2003-Jun-19

Publishing Venue

IBM

Related People

Authors:
David Bagaoisan Robert Reinhart

Abstract

There is disclosed a two piece actuator latch that is designed to close during a rotational shock event in both clockwise and counter clockwise directions. The advantage of using this type of latch design is that it is only used during rotational shock events. Nominally the inertial latch is open so that the actuator can swing freely on to the disks from the ramp (figure 1). This enables a more controlled servo loading operation on to the data zones. During a non-operational clockwise rotational shock, the inertial latch long lever reacts to the event and begins to rotate the inertial latch short lever (figure 2) which catches the actuator yoke arm and prevents unintentioanl loading of the actuator on to the data zones. During a non-operational counter clockwise rotational shock, the inertial latch long lever reacts to the event and begins to rotate the inertial short lever (figure 3) which catches the actuator yoke arm and prevents the unintentional loading of the actuator. In order to reset the latch, the actuator is biased against the OD crashstop and the magnetic member such as stainless steel ball is molded into the inertial short lever will reset the assembly to the nominal open position (figure 1) by the use of the magnetic fringe field of the VCM magnets. 1