The absolute filter and high efficiency blower
are
components of the air system and are
mounted into the base casting.
In addition, duct work, either integral with the base casting
or formed by suitable cover plates, provides the means for
channeling the filtered air into
the
area
of the disk and heads.
The
air system provides a highly filtered air flow into the
area
of
the disks and disk cartridge. Operational characteristics of the flying head type
of
magnetic
head
employed in the disk drive require that the air bearing formed between the
head
and the disk surface
be
relatively free of particle contamination. Therefore, the
filtered air flow provided by the air system causes a continual flow of clean air
to
purge
this
area
of the disks and ensure correct operation of this air bearing. The air cushion
which causes the heads to
fly above the surface of the disk is dependent only upon the
surface velocity of the disk and not
upon.
the air flow through the filter.
The
spindle assembly mounts into the base casting and provides the central axis of
rotation for the disks. This spindle is a precision machined assembly utilizing
ball
bearings which
are
pre-loaded to provide a runout of less than several hundred micro
inches. The assembly contains the phase lock ring which is used for sectoring the lower
disk and for the spindle speed control.
It also provides a mounting location for the lower
disk in dual disk drives. A permanent magnet clutch, used to engage the hub of the
removable-cartridge, is mounted
on
top of the spindle hub. A precision ground cone is
also on the top of the spindle hub
to
accurately center the cartridge
hUb.
The hub of the
spindle assembly acts
as
an
air pump
to
pump the filtered air Into the area of the cartridge.
The
drive motor is mounted
on
a mounting plate which,
in
turn, is mounted
to
the base
casting.
The
drive motor provides the power
to
rotate the disks at the prescribed speed
and
drive the blower in the air system. This motor is a multiple winding, permanent split phase
induction motor which is used to drive the spindle and the blower through a belt drive
system. The drive train components consist of the
pulleys at the spindle, the blower shaft,
the motor, and the tension idler. The necessity of having a belt tension adjustment is
avoided by spring-loading the tension idler to maintain a constant belt tension.
The
design of the 03000 disk drive provides maximum commonality
of
mechanical
components between top load and front load models.
The
major difference between top
load
and
front load machines is
in
that
area
which receives or adapts the cartridge to the
disk drive.
In
top load models, the cartridge adapter is a machined aluminum alloy casting which
mounts
to
the top of the base casting. Mounted
on
this adapter is the cartridge lock
mechanism with
an
arm that pivots out over the top of the cartridge dust cover.
The
position of this arm is sensed with a snap-action switch. The arm
can
be
locked or
unlocked by a solenoid arrangement fitted to the adapter. Also mounted on the adapter are
booms for supporting the magnetic transducers.
In
front load models, a receiver assembly is fitted to the top
of
the
base
casting
and
is
pivoted from supports attached to the base casting. This arrangement provides a
mechanism for properly locating the cartridge into the disk drive.
It is also the mechanism
for disengaging the cartridge hub from the magnetic clutch on the spindle. A link
arm
which is integral with the
bezel
assembly provides the camming action to disengage the
cartridge hub from the magnetic clutch.
4-3
6300
To Next Page
Loading...