8.
STANDARD ADJUSTMENTS
8.
STAN ADJUSTMENTS
Maintenance and inspection
of
the sewing
machine should only be carried out by qualified
personnel.
Ask your dealer or a qualified electrician
to
carry
out
any maintenar.ce and inspection
of
the
electrical
systern.
If
any safety devices have been rernoved,be
sure
to
m-install
them to their
original positions and check that they
operate
correctly before using the machine.
8-1.
Adjusting the thread controller spring
-14-
power cord from the wall outlet at the
times, otherwise the machine may operate if
treadle
is
by mistake, which could
in
injury. However, the motor will keep
even after the power
is
switched
off
as
a
the motor's inertia.
Wait until the
fully before starting work.
When carrying out inspection,
maintenance
When replacing consumable parts
rotary hook
If the
power
switch needs
to
be
left
on
carrying
out
some adjustment. be
careful to observe
all
safety precautions.
Operating range
of
spring
The standard operating range for spring
CD
is
5-1
Omm.
1.
Loosen the
screw
\2·,
and then turn the thread con
troller spring stop
~
to adjust the operating range.
• For more operating range, move the spring stop
~~?!
to
the right.
• For less operating range, move the spring stop
Qi
to the
left.
2.
Tighten the
screw
(2_:.
Tension
of
the spring
The standard tension for spring
is
0.39-0.78
N (40-80g).
1.
Loosen the tension
thumb
nut
\4;
and
screw@.
2.
Turn the tension stud (§l to adjust the tension.
To
increase the spring tension, slightly turn the tension
stud
®!counterclockwise.
To
decrease the tension, turn the stud clockwise.
3.
After adjustment, tighten the tension thumb nut
0\)
and
screw\!?).
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