Browse Prior Art Database

Double Ended Spring Crash Stop with Offset for Disk Files

IP.com Disclosure Number: IPCOM000100592D
Original Publication Date: 1990-May-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Dominguez, M: AUTHOR [+3]

Abstract

Disclosed is a crash stop device that optimizes the use of disk real estate and the deceleration 'g' forces of a head/arm/carriage assembly. Included in the design is a simple and effective method that eliminates damage to the data tracks during the start and stop operations. Protection is also provided to the data tracks during shipment of the HDA.

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This is the abbreviated version, containing approximately 79% of the total text.

Double Ended Spring Crash Stop with Offset for Disk Files

       Disclosed is a crash stop device that optimizes the use
of disk real estate and the deceleration 'g' forces of a
head/arm/carriage assembly.  Included in the design is a simple and
effective method that eliminates damage to the data tracks during the
start and stop operations. Protection is also provided to the data
tracks during shipment of the HDA.

      A preloaded compression spring is used to control the maximum
'g' forces during crash stops while minimizing the crash stop travel
and disk real estate.  The disk surface under the head during crash
stop cannot be used for data; it is therefore beneficial to keep the
crash stop travel to a minimum.

      A requirement of the crash stop device to to provide a
predetermined offset of the carriage/head/arm assembly during the
spin-up duration of the disk file, and until the heads are flying.
The offset is determined by the amount required for the head rails to
use a different portion of the disk during take-off.

      During file start-up, the carriage is biased against the O.D.
crash stop of the rod (not shown).  This bias is provided by
energizing the VCM with just enough current to compress the offset
spring and rod assembly (see the figure) until the O.D. stop flange
is against the counterbore in the housing.  The offset spring is a
light spring and operates between the O.D. stop flange and the
shoulder in the housing bore (see the f...