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4-6.
Thread
Tension
Adjustment
Set
the
balance
of
the tension
as
weak
as
possible.
To
tighten
the
tension,
turn
tension
dial
to
a
higher
number.
To
loosen
the
tension,
turn
tension
dial
to
a
lower
number.
®
Left
needle
thread
tension
©
Right
needle
thread
tension
©
Upper
looper
thread
teqsion
Lower
looper
thread
tension
(2)
Unbalanced
upper
looper
thread
wraps
round
and
over
the
back:
Tighten
the
thread
tension
of
the
upper
looper
(Dial
©)or
loosen
the
thread
tension
of
the
lower
looper
(Dial
©).
(1)
Correct
tension.
•
Lower
looper
thread
and upper
thread
should
be
well
balanced
with
same
tension.
(Both
looper
threads
should
make
crosses
at
the
edge
of
the
fabric.)
•
Needle
thread
should
not
be
slacken,
or
pulled.
looper
thread
Right
needle
thread
Upper
looper
thread
—13—