Browse Prior Art Database

Disk Stack Assembly Cleaner

IP.com Disclosure Number: IPCOM000121547D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 2 page(s) / 86K

Publishing Venue

IBM

Related People

Keenan, PT: AUTHOR

Abstract

A tool is disclosed for use at the assembly stage of the manufacture of disk files. Under manual or automatic control it cleans and burnishes disk surfaces before read-write heads can contact asperities or contamination that cause test failure or file crashes. Benefits arise by protection of product heads prior to flying-height measurement and glide-test, increased glide-test yield with reduction in product cost and rework to disk after removal from a failed machine. It can simultaneously clean two opposing disk surfaces either at spindle level, file level, or an assembly of individual disks arranged on a spindle spinning together.

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This is the abbreviated version, containing approximately 52% of the total text.

Disk Stack Assembly Cleaner

      A tool is disclosed for use at the assembly stage of the
manufacture of disk files.  Under manual or automatic control it
cleans and burnishes disk surfaces before read-write heads can
contact asperities or contamination that cause test failure or file
crashes.  Benefits arise by protection of product heads prior to
flying-height measurement and glide-test, increased glide-test yield
with reduction in product cost and rework to disk after removal from
a failed machine.  It can simultaneously clean two opposing disk
surfaces either at spindle level, file level, or an assembly of
individual disks arranged on a spindle spinning together.

      The mechanism consists of one or more fingers covered with a
cleaning tape, which are inserted into the spaces between multiple
disk surfaces while spinning.  When in position, air is applied to
each of the fingers which pushes the cleaning tape into contact with
the disk surfaces.  The fingers are then withdrawn from the spinning
disk with the tape still in contact with the surface, so removing the
contaminant which is transferred to the tape.  Flat fingers which
have two channels machined down their length with openings on each
surface of the finger are covered with disk cleaning tape supplied
from a roller or cassette.  On completion of the operation the tape
is replaced with unused tape fed by a spool mechanism.

      The method can be used interactively with head-disk glide test,
and then selectively applied to a surface which a test has defined as
being defective.  In this mode, only one air channel in the finger
need be activated, and only one side of the tape need be applied to
the disk surface. Having two independent air channels, allows the
tape pressure applied to the disk to be adjusted so that equal
pressure is applied to both surfaces.  The surfaces of disks are
magnetically tested using the product heads themselves. If...