-
When
pulling
the
spring-scale in the normal tape direction,
a
readlng
of 14
ounces
(
ap. 400
gr
)
should
be obtalned. The
correspondlng torque is
5 cm
x 400
gr
=
2000 cmg.
Coarse adjustment can be made by connecting the
splral spring to one of the
three holes
as
shown ln
fig.
7. Por fine-adjustment
the knurled nut B
(
f.le.
7
)
needs to be turned.
Turn the NAB reel
so
that the brake
drum
rotates
in the contrary dlrectlon when,
pulling
the
spring-scale.
7. Brake tenslon ln correct, when
a
reading of 1,5
ounces
(
45
gr
)
is obtalned.
The
corresponding torque ls 5 cm x 45
gr
=
225
cmg.
Adjust
wlth
alignment
screw
A in fig.
7.
8. Repeat
both adjustments alternately, until optimum results
are achieved. The
ratio I
:
I of both braking torques is
accesslble by
means
of
a servocord
which is fasterd
at
the black indlcated lever
(
in fig.
7
).
When
the
stop
key
is
pressed,
electrical as
well
as mechanlcal braking is
applled,
By means
of
a
relay,
DC is injected
for
a
short time into both
spooling
motors, the
braklng torque is
about
four
times
greater
in the
motor
actlng as take-off motor than in the one
acting as take-up
motor.
This ensures rapid braking wlthout spillage.
For
cuing the tape the fast wlnd keys may be depressed
halfway separately or together
and
held
ln
this
position
as
long
as
necessary.
(
The
second
key wlll
act as a brake
)
When the keys
are
released the tape wlll
stop.
To
avold depressing
the
keys too
far,
the hand may be rested on the
deck-plate.
For fast forward
and
rewlnd, the
appropriate key
should
be depressed fully
ard
re-
Ieased
at
once.
The machine can then only be
stopped
by operating the
stop
button.
If a
long length of tape ls
being rewound,
a very hlgh wlnding
speed
may be reached
and the tape
may
be slowed down by depressing the
fast
wird key in the opposite
dlrectlon ard brought almost
to a stand-stlll before operating the stop button.
In
this way, it
ls
possible
to avold tape splll
even
under
the most
extreme condltions. Thls
method
also helps to avold damaglng the tape ends
when fully rewinding
a
tape. A
smooth stop
can be
achieved
even wlth very little experience.
Durinq fast wind, the tape is lifted off the heads to
avoid
head wear
by
means of the tape llftlng
mechanism.
See
C
5
"Tape
Llfting Mechanlsm". Thetape
may,
however, be monitoredduring
fast
wind
for
short
perlods,
by operating the knurled wheel on the left
.
(
Pos
. 6
f.tg
. 2
)
4.
6.
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