4. PREPARATION BEFORE SEWING
4-5. Thread tension
[Thread tension reference]
Specifications
Heavy-weight materials (-01) Medium-weight materials (-02)
Upper thread
Lower thread
Upper thread tension
(N)
Lower thread tension (N)
Pre-tension (N)
Needle
Normal sewing speed
4-5-1. Lower thread tension
Stron
Weaker
(1)---i-i--/fi'c---'c,
)
4-5-2. Upper thread tension
#20
or
similar
#20
or
similar
1.4-1
.8
0.1 - 0.6
DP x
17
#19
2,000 rpm
#50
or
similar
#50
or
similar
0.8-
1.2
0.2 - 0.3
0.1
- 0.3
DP x 5 #16
2,000 rpm
Ad
just the thread tension to the weakest possible tension by
turning the thread tension nut (1) until the bobbin case will
not drop
by
its own weight while the thread end coming out
of
the bobb
in
case is held.
1. Turn the tension nut (1) (main tension) to adjust the
tension as appropriate for the material be
in
g sewn.
2. Use the tension nut (2) (sub tension) to adjust the upper
thread trailing
le
ng
th to about 40 mm.
20
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
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