Browse Prior Art Database

Mismatch Cassette/Pallet Batch Tracking Scheme

IP.com Disclosure Number: IPCOM000115885D
Original Publication Date: 1995-Jul-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 6 page(s) / 161K

Publishing Venue

IBM

Related People

Bianchini, J: AUTHOR [+9]

Abstract

Disclosed is the architecture for an automated batch tracking technique that allows cassettes and pallets with varying capacities to be used in the manufacturing process for hard disks of varying sizes. This technique optimizes manufacturing throughput while not requiring modification to the manufacturing line.

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

Mismatch Cassette/Pallet Batch Tracking Scheme

      Disclosed is the architecture for an automated batch tracking
technique that allows cassettes and pallets with varying capacities
to be used in the manufacturing process for hard disks of varying
sizes.  This technique optimizes manufacturing throughput while not
requiring modification to the manufacturing line.

      In prior art, other implementations were both manual and
provided inaccurate tracking data for the shop floor control system.

      The sputtering process for hard disk manufacturing requires
that the hard disks be loaded from cassettes of varying quantities
onto a vertical pallet, also holding various quantities.  The
cassette and pallet quantities vary with the size hard disk.

      The following information is collected both prior to and after
the disks go through the sputtering process.
  o  Record the cassette ID where the disks are picked up from
  o  Record the number of disks in each cassette prior to loading and
      identifying any slot in the cassette where a disk is not
present.
  o  Record the pallet ID where the disk is loaded
  o  Identify which disk in the cassette is loaded in which slot in
      the pallet.
  o  Record the slot number in the pallet where the disk is loaded
  o  Record any open pallet slots during transportation between the
      load and the unload operation.
  o  Record the cassette ID where the disks are unloaded
  o  Record the number of disks in each cassette after they are
loaded
      and identifying any slot in the cassette where a disk is not
      present.

      The information gathered during the sputtering operation is
stored in the shop floor controller and is later used to pin point
exactly:
  o  What causes the defect when a disk is found defective.
  o  When a disk may be missing and where it might be.

      Batch tracking is simple if the number of disks carried by the
cassette matches the number of slots in the pallet.  Unfortunately,
these two numbers can not be matched because of the size of the
disks.  As technology causes the disks to become smaller and smaller,
it requires several cassettes of disks for each pallet.  Otherwise,
it limits the throughput and/or requires modification to the
equipment on the manufacturing line prior to and after the sputter.
Therefore, the cassette size and pallet size must be variable and
have capacities independent of each other.

      This disclosure describes a unique technique which allows batch
tracking...