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4-6. Adjusting the thread tension
❶
❶
❷ ❷
B
(1) Adjusting the needle thread tension
Thread tension controller No. 1 ❶
When the tension disk of active tension ❸ is
loosened, a small amount of tension that is suffi-
cient to control thread trimming has to remain.
The remaining tension is produced by tension
controller ❶ . It is possible to determine the
length of thread trailing from the needle after
automatic thread trimming by adjusting nut ❷
of the thread tension controller. The length of
thread trailing from the needle is reduced by
turning nut ❷ clockwise (+). It is increased by
turning nut ❷ counterclockwise (-).
Active tension ❸
❸ ❸
The tension of active tension ❸ (tension of the
thread coming out of the needle eyelet) should
be set as low as possible so that the threads
intertwine at the center of the material (Fig. A).
If the thread tension is excessively high when
sewing a light-weight material, the material may
become wrinkled or thread may break.
Adjust the tension by changing A and B.
The adjustment range is from 0 to 100. The higher
the adjustment value, the higher the tension.
[Application range of A and B]
Save the tension setting of A in the pattern data.
The set value will be automatically changed if you
change over the pattern data.
A
The tension setting of B applies to all patterns. How-
ever, it is not saved in the pattern data. This means
that the setting of B will not be changed even if you
Fig. A
change over the pattern data.
Refer to the next page for detailed instructions on
how to use active tension ❸ .
Fig. B
Fig. A: Threads are interlaced together accurately at
Fig. C
Fig. B: Needle thread tension is too low or bobbin
Fig. C: Needle thread tension is too high or bobbin
– 31 –
the center of material thickness.
thread tension is too high.
thread tension is too low.
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