27
990D
Thread tension dials are already adjusted for general sewing at factory, however, if you
want to adjust much stronger or weaker fr special sewing, it can be adjusted as follows:
To adjust:
1. Pull out the thread tension dial.
2. Turn the dial knob leading screw to adjust the thread tension to direction of:
A to get weaker thread tension.
B to get stronger thread tension.
3. Set the tension dial number “3” with stopper, and insert the thread tension dial.
Correct setting for general sewing:
When each dial is set at “3” and No. 50 polyester filament thread is used, the thread
should be as follows;
Needle (Left) :
33~53 g
Needle (right):
14~24 g
Upper looper:
11~21 g
Lower looper:
23~33 g
When each dial is set at “9” and No. 50 polyester filament thread is used, the thread
tension should be as follows;
Needle (Left) :
150 g or more
Needle (right):
57 g or more
Upper looper:
45 g or more
Lower looper:
140 g or more
TO ADJUST THE THREAD TENSION DIALS
Stopper
Direction A
Direction B
Dial knob leading screw
Thread tension dial
