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Actuator Spacer Mechanism for Assembling Direct Access Storage Devices

IP.com Disclosure Number: IPCOM000110279D
Original Publication Date: 1992-Nov-01
Included in the Prior Art Database: 2005-Mar-25
Document File: 6 page(s) / 143K

Publishing Venue

IBM

Related People

Barenboim, M: AUTHOR [+6]

Abstract

Described is a hardware implementation of an actuator spacer mechanism. The mechanism is designed to be used in the automatic/simultaneous insertion of multiple head suspension assemblies (HSAs) of direct-access storage devices (DASDs).

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Actuator Spacer Mechanism for Assembling Direct Access Storage Devices

       Described is a hardware implementation of an actuator
spacer mechanism.  The mechanism is designed to be used in the
automatic/simultaneous insertion of multiple head suspension
assemblies (HSAs) of direct-access storage devices (DASDs).

      Typically, the actuator used in DASDs has either single or
multiple HSAs attached to its base or comb.  The number of HSAs
depends on the model and type of disk drive.  One type of actuator
has sixteen HSAs (eight tops and eight bottoms) and represents the
relative position of the HSAs in respect to the mounted disks.  In
prior art, actuators were assembled manually, and the HSAs were
attached to the comb arm by means of a swaging process.  Assembly
fixtures were used to individually merge the HSAs one at a time where
each fixture had a set of spacers to fill the gap between the HSA and
the comb arm.  The HSA was merged to the actuating arm by engaging
the HSAs boss with the arms swage hole.  When all of the HSA's were
merged, the actuator was transferred to a swage operation.  This
merge operation was tedious and time consuming, requiring skilled
operators.  The concept described herein is aimed at removing the
tedious operation by providing an automatic actuator spacer mechanism
for HSAs.

      Fig. 1 shows actuator assembly 1 which consists of eight top
HSAs 2, eight bottom HSAs 3, comb 4 and cable 5.  Separator 6 is used
to prevent HSA heads 7 from touching each other prior to the
installation of actuator 1 into the disk drive mechanism (not shown).
Each comb arm 8 has a sage hole 9 to facilitate the HSA merge and
swage operation.  Comb arms 8 are designed to be positioned close to
each other.  The distance between the arms dictates the shape of HSA
magazine 15 (Fig. 3).  Also, HSA heads 7 (Fig. 1) are marginally
close to each other while being inserted into comb 4 and immediately
prior to the merge, sideways move.  At this point, the distance
between the heads is approximately .005" and can cause the heads to
touch and possibly damage the heads.  Therefore, the use of the
spacer mechanism, in conjunction with magazine 15, eliminates this
head damage problem.

      Figs. 2a and 2b show top HSA 2 and bottom HSA 3, respectively,
prior to installation into comb 4 (Fig. 1).  HSAs 2 (Fig. 2a) and 3
(Fig. 2b) use thin load beam 10 attached to precision mounti...