Routing Upper Thread; Adjusting Upper Thread Tension - SunStar KM-380BL User Manual

▶Turn off the power switch when routing the upper thread.
If the operator mistakenly presses down on the pedal while switched on, the machine will start
automatically and can cause physical injuries.
▶When using the clutch motor, be aware that the motor will continue to rotate for a while even
after the power is switched off due to inertia.
Start to work on the sewing machine only after the motor has come to a complete stop.

5) Routing upper thread

KM-380BL/390BL
Place the thread take-up lever to the highest position and hang
the upper thread like in Figure 14.

6) Adjusting upper thread tension

KM-380BL/390BL
A. Adjusting the upper thread tension
- Like in Figure 15, turning the tension adjustment nut
thread tension stronger and counterclockwise makes it weaker.
B. Adjusting the thread take up
a. Adjusting the thread take up stroke
- As in Figure 15, loosen the stopper fastening screw , and turn the thread take up spring stopper
make the operational scope of the thread take up spring
Caution
of the thread tension control assembly clockwise makes the upper
bigger, and clockwise to make it smaller.
good swing
when the upper thread tension is strong
when the upper thread tension is weak
[Figure 14]
counter clockwise to
[Figure 15]
13