Browse Prior Art Database

Disk Stack Centralizing

IP.com Disclosure Number: IPCOM000102089D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Mason, AJ: AUTHOR [+2]

Abstract

A direct access storage disk stack comprises an internal motor-driven hub onto which disks, spacers, clamp ring, filter and screws are assembled. Balancing of each disk in the stack is necessary before clamping the stack and this is achieved without the traditional means of addition or removal of material (weight). The technique is applicable to any mechanism where parts have a common axis of rotation within the assembly and are physically symmetrical about their own axis. Accuracy of alignment may be set to any manufacturing degree required, limited only by the physical tolerances of components, alignment fixturing and a master gauge.

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This is the abbreviated version, containing approximately 77% of the total text.

Disk Stack Centralizing

       A direct access storage disk stack comprises an internal
motor-driven hub onto which disks, spacers, clamp ring, filter and
screws are assembled.  Balancing of each disk in the stack is
necessary before clamping the stack and this is achieved without the
traditional means of addition or removal of material (weight).  The
technique is applicable to any mechanism where parts have a common
axis of rotation within the assembly and are physically symmetrical
about their own axis.  Accuracy of alignment may be set to any
manufacturing degree required, limited only by the physical
tolerances of components, alignment fixturing and a master gauge.

      With reference to Figs. 1 and 2, the basic principle for
centralizing each and every component disk 3 is based on three points
of location 5 symmetrically displaced, 120 degrees apart, about the
common axis of the hub 8 of the disk stack.  A mounting plate 7
supports the three centralizing bearings 5, with associated
centralizing rod 2 holders, and the demountable hub 8.  One annular
cam 1 per disk is supported by bearings 5.

      The sequence of operation is that the cam 1 is rotated by
applying a force F such that the three centralizing rods 2 engage on
their respective cam profiles on three cam 1 and are driven forward
equally towards the center of the common axis, engaging and
positioning the individual disks 3 until the applied force becomes
equalized.  The disks 3 are then he...