BASF 6106 - Positioning Mechanism

2.1.3.
POSITIONING
MECHANISM
The
main
parts of
the
positioning
mechanism
are
(see
Fig.
2
-
4
)
.
•
Stepper
Motor
•
Spiral
Wheel
•
Carriage
Assembly
The stepper
motor is
a
four
phase
motor and
is
rotated
15°
by
every
step
pulse.
The spiral
wheel
directly
connected
to
the
shaft
of
the
stepper
motor
converts the
rotational
motion
of the
stepper
motor
to
a linear
motion
of
the
read write
head.
The carriage
assembly
consists
of the read/
write
head,
the
head load pressure
arm
and
two
guide bars.
The
read/write
head
is
inser-
ted
in
the carriage
assembly,
which
rides on
the two
guide
bars. The mini disk
is pressed
against the
read/write
-
head load
pressure
arm.
The
head load
pressure, arm is
released
by
the head load
mechanism.
GLIDE
BARS
R/W
-
HEAD
HEAD LOAD
PRESSURE
ARM
STEPPER
MOTOR
SHAFT
FIGURE
2
-
4 .
POSITIONING
MECHANISM
2-3