Browse Prior Art Database

Sub-Miniature Disk Outside Diameter Gripper

IP.com Disclosure Number: IPCOM000114512D
Original Publication Date: 1994-Sep-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 4 page(s) / 80K

Publishing Venue

IBM

Related People

Mello, T: AUTHOR [+3]

Abstract

A subminiature disk Outside Diameter (OD) gripper design was required for use with a Rotational Transport Assembly (RTA) to load and unload hard storage disks 95mm and smaller in diameter during manufacture and testing. In prior art, disk grippers were designed to handle disks with 65mm and larger diameters. As a result, the commercially available grippers intended for very much larger disks were not suited for handling the smaller disks that have come into use with the industry trend toward ever-increasing density and miniaturization. For one thing, grippers designed to handle relatively large, thick disks can cause damage to thinner ones; for another, the relatively higher mass of the components of large grippers limits the speed at which they move--and consequently on the throughput of the RTA.

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

Sub-Miniature Disk Outside Diameter Gripper

      A subminiature disk Outside Diameter (OD) gripper design was
required for use with a Rotational Transport Assembly (RTA) to load
and unload hard storage disks 95mm and smaller in diameter during
manufacture and testing.  In prior art, disk grippers were designed
to handle disks with 65mm and larger diameters.  As a result, the
commercially available grippers intended for very much larger disks
were not suited for handling the smaller disks that have come into
use with the industry trend toward ever-increasing density and
miniaturization.  For one thing, grippers designed to handle
relatively large, thick disks can cause damage to thinner ones; for
another, the relatively higher mass of the components of large
grippers limits the speed at which they move--and consequently on the
throughput of the RTA.  By satisfying these design requirements, the
Subminiature Disk OD Gripper (SDOG) has enabled the RTA to achieve
significant increases in throughput.

      Fig. 1 shows the components of the SDOG.  Air pressure applied
to the inlet port 1 forces non-rotating pistons 2 and 3 outward,
moving finger 4 to the open position.  When air pressure is removed,
spring 5 pushes piston 3 against the stop 6, moving the buttons 7
until they contact the left side of the disk 8.  Using this as a
reference position, a tension adjustment device 8 ensure safe
handling of the disk by controlling movement of piston 2 so that the
button...