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Disclosed is an axis-coupling device for fast and accurate control of a rotary actuator in a disk file system with an external rotary sensor.
English (United States)
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This is the abbreviated version, containing approximately
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Accurate Axis Coupler for Rotary Actuator Control
Disclosed is an axis-coupling device for fast and accurate control of a rotary
actuator in a disk file system with an external rotary sensor.
An external rotary sensor (encoder) is applied to a head positioner on the
manufacturing line of a magnetic disk system which has a rotary actuator. The
sensor is fixed to an actuator pivot shaft through an axis coupler, and detects the
rotary angle of the actuator which is driven by a Voice Coil Motor (VCM) as
shown in Fig. 1. Here, the requirements to the axis coupler are high resonant
frequency, controlled low vertical force, very low horizontal force, and fine axis
alignment for accurate position sense without interference of mechanical force.
The coupling system is shown in Fig. 2. An elevator lifts up the coupling
device to the stopper height. Then, a floated stage horizontally moves free.
There is a tapered joint on the top of a coupler cylinder. The joint follows the
VCM axis, and the floated stage makes self alignment between the VCM axis
and that of encoder. The coupler cylinder slides on a V-groove of the encoder
axis with a ball bearing. The vertical coupling force is kept constant according to
tension of a coil spring and the stopper height. This coupling method naturally
makes these sequences only by lifting the elevator. The floated stage is locked
by clipping a metal sheet which is horizontally rigid but vertically compliant. This
coupler has high torsional s...