Necchi Lock 181 - Adjusting Thread Tensions

Lower
looper
thread
Upper
looper
thread
Left
needle
thread
Fig. 1
Right
needle
thread
Top side
Under side
Just right.
Lower
looper
thread
Fig. 2
Top side
Under side
Upper
looper
thread
Upper looper thread pulled to
under side.
Increase upper looper thread
tension and/or decrease lower
looper tension.
Lower looper thread pulled to
top side.
Increase lower looper thread
tension and/or decrease upper
looper tension.
Fig. 3
Top side
Upper
looper
thread
Lower
looper
thread
Left needle thread loose and
visible on under side of fabric.
Under side
Under side
Right
needle
thread
Fig. 5
Top side
Right needle thread loose and
visible on under side of fabric.
Increase left needle thread
tension and/or decrease either
or both looper threads.
Increase right needle thread
tension.
Decrease needle tension.
Just right.
Lower looper thread pulled to under side.
Needle thread pulled to top side.
Increase needle thread tension.
Under side
Left
needle
thread
Fig. 4
Top side
ADJUSTING THREAD TENSIONS
Turning tension dial to a higher number gives a tighter
thread tension. Turning tension dial to a lower number gives
a looser thread tension. The higher the number, the tighter
the tension.
Test each thread tension on a scrap of the fabric you plan to
use.
FOUR-THREAD USE
TWO-THREAD USE
20
Decrease tension
Increase tension
4
Under side
Fig. 2
Top side
Lower
looper
thread
Needle
thread
Under side
Fig. 3
Top side
Lower
looper
thread
Under side
Fig. 1
Top side
Lower
looper
thread
Needle
thread
Needle
thread