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"Flat Drive
Belt;'--
The Key To
Further Improvement In Wow-And-
Flutter
vibration,
Kenwood
engineers decided
to
incorporate
two separate
belts: one
solely
for
driving the capstan; the other
for
driving the
take-up
reel.
As a result
of this two-belt system, the KX-I030
provides low
wow-and-flutter
as
well
as
accurate
and
stable
rotation
of
the
capstan,
regardless of
tape accumulation
on
the
take-up reel
of the cassette.
Ordinary
one-belt
drive
system
!
Motor
pulley
Take-up
reel,
Feed;ng,C§)
Kenwood's
two-belt
drive
system
Capstan Roundness
Accuracy
-
The Final Step In
Reducing Wow-
And-Flutter
The
capstan used in
Kenwood's
KX-
1030
is
machined to
the critical round-
ness tolerance
of
0.1 microns,
thus
reducing
another
important
cause of
wow-and-flutter. The capstan roundness
chart illustrated
here indicates clearly
the degree
of roundness achieved in
Kenwood capstans.
Capstan
accuracy must
be maintained
indefinitely,
and not only
when
the
cassette
deck
leaves the factory.
In
order
to maintain this
built-in
accuracy,
Kenwood engineers
have
incorporated
a
triangular capstan support system. This
three-point
support
(as
opposed
to
single or
dual-support systems
used
by
other
manufacturers)
can
withstand
shocks
from
any
direction
without
affecting the
mechanical
stability of the
capstan system. Thus, long
term
relia-
bility
and
low wow-and-flutter
per-
formance
are assured through
many
years
of continued use.
The drive .system used to transfer
rota-
tional
energy
from
the
motor to
the
flywheel can be used to further reduce
undesirable
wow-and-flutter.
A round
cross-sectional type of
belt,
such as
that
used in most
cassette decks, does not
provide
sufficient contact surface
to be
used in a precision cassette deck such
as
the
KX-I030. In'
order to
reduce
slip-
page and vibration caused
by
the
subtle,
irregular motion
that takes
place
be-
tween
the
flywheel and
the drive belt,
Kenwood
engineers
elected
to
use a
flat
belt
having
a
width of
5 millimeters.
This belt
not
only reduces slippage
because of
its
large contact
surface,
but
also absorbs vibration
caused
by the
irregular
motion
inherent
in
the
remainder of
the drive
system.
Unlike flywheels
with V-grooves gouged
into their
surfaces, the flat,
polished
surface
of
the
flywheel used in the
KX-I030
provides
exact
concentricity
required
for
precise
rotation.
Such
accurate
roundness
is
difficult if
not
impossible to
achieve
with
conventional,
V-grooved
flywheels.
Flywheel
with V·Shaped Groove
KX-1030
Flywheel
Kenwood's
triangular capstan
shaft
support.
Capstan Roundness
Chart
A
Double
Dolby
System
Because the record
amplifier and play-
back amplifier
of
the KX-I030
are
completely
independent
of each
other
in order
to accommodate
simultaneous
tape
monitoring
in
the
three-head
system,
separate
Dolby
encode
and
decode
circuits have also
been incorpo-
rated. Each
of
the
four
circuits involved
is therefore
precisely
calibrated
to
perform
its
assigned function.
Play
Head
p.
8.
EQ AM
P
--[:::>--1
PB.Dolby
~OutPut
AEC
Head
REC EQ AMP
.
Erase
"
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~I ~
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0""
~
---0
Input
BIAS
ose.
Tape.
Double Dolby System
Vertical Tape Transport Using
Independent Belt Drive System
Further Improv~s The Wow-And-
Flutter Characteristics Of
The
KX-I030
In most cassette
decks employing
a
single-motor
drive, one
belt
is
used
to
drive
the
tape
as
well
as
the take-up
reel.
In such
systems,
so long as there is no
tape
on
the
take-up
reel
side,
the
cap-
stan
drive
system
operates
without
interruption.
However, as tape
accumu-
lates on the
take-up
side,
irregularities
or
"bumps"
in the action of
the
take-up
reel
may
affect the operation of
the
capstan drive.
In
order to
reduce wow
created
by
such
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