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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
Document File: 1 page(s) / 28K

Publishing Venue

IBM

Related People

David Bagaoisan: AUTHOR [+2]

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.

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

   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.

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