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Chapter Two
2.1
Mechanism Explanation
The
1540/1541
mechanism
is
installed
in
the
system
horizontally,
however
the
drive
will
fuction
if
mounted
vertically.
The
mechanical
parts
of
the
drive
include
an
aluminum
chassis,
a
stepping
motor,
head
positioning
assembly,
drive motor,
a hub and
spindle
assembly
for
centering
and
retaining
the
media
during
operation.
The magnetic head is of a glass ceramic construction.
2.2
Function explanation
The
drive
is
itself
an
independent
memory
device.
The drive
is
composed
of
a
media
clamp
rotating jnechanism,
ahead
positioning
mechanism
and
an eject mechanism.
When the
front door opens,
the
media can be inserted. All positioning operation excluding insertion
and
removal
of
the
media
are
controlled
by
the
internal
guide
mechanism.
Closing the front door causes the media clamp mechanism
to operate.
Two operations are performed in the following order:
a)
The media is centered.
b)
The media
is clamped and retained between the spindle and the
hub.
The
spindle
and
hub
rotate
at
300
r.p.m.
through
a
closed-loop
control circuit employing a D.C. motor/tachometer.
It is important
that
the
relationship between the head and the media
is maintained
correctly
during
operation.
For
this
purpose,
a pressure pad
is
used
to hold and press down the media (about 12g)
from the opposite
side
of
the
head,
to maintain
the correct
contact with
the head.
This
head
assembly
is
coupled
by
a
metal
band
to
a
four
phase
stepping motor the performs the track positioning.
One step of the
stepping motor corresponds to a 1/2 track movement.
Use of a high
speed
stepping
motor
and
metal
band
drive,
this
series
of
disk
drives can perform access operations at a very high speed.
2.3
Assembly procedure
2.3.1 The.housing assembly; install the eject pin and the spindle.
2.3.2 The housing assembly; on the reverse side install the spindle
pulley.
4
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