Browse Prior Art Database

Pivotable Ramp Head Load Mechanism for Direct Access Storage Devices

IP.com Disclosure Number: IPCOM000115704D
Original Publication Date: 1995-Jun-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Boigenzahn, JF: AUTHOR [+6]

Abstract

Disclosed is a pivotable ramp mechanism for loading and unloading recording heads from the disk surface in magnetic disk drives.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 99% of the total text.

Pivotable Ramp Head Load Mechanism for Direct Access Storage Devices

      Disclosed is a pivotable ramp mechanism for loading and
unloading recording heads from the disk surface in magnetic disk
drives.

      Conventional head load/unload ramp designs in Direct Access
Storage Devices (DASD) typically rely on the head suspension member
riding up an inclined surface that is fixed to the DASD structure.
However, once the heads are unloaded and parked off of the disk, the
frictional forces between the suspension and the loading ramp can
become significantly large, making subsequent loading operations
difficult.

      By rotatably mounting the loading ramp, the ramp pivots
slightly during the head loading operation.  The rotating action can
create larger forces to break the friction with relatively small
forces from the actuator motor.  Thus for small files with limited
power sources, the current required to load the heads can remain
small while the forces applied to break the head to ramp friction
will be large enough to load the heads.  In addition, lower
frictional forces allow better load velocity control when breaking
the static friction.

      In addition, by allowing the ramp to rotate, a head loading
algorithm that employs a single fixed current or a small range of
currents will work over a wider range of ramp to suspension friction
values.  The result is a more robust design that can handle the large
variations that occur in the manufacture of DA...