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2) Hooking lower thread
Put bobbin into bobbin case. Then, pass a thread
through a thread hole, and hook the thread under a
tension adjusting plate spring.
4.4.2) How to separate bobbin case
Grab the handle of bobbin case, and push it into a hook
until a sound is heard.
Operating machine while the bobbin case does not enter fully can lead to tangled thread or
make bobbin case spring out.
CAUTION
4.4.3) How to adjust tension
1) Adjusting upper thread tension
Turn the tension nut of major and minor thread tension
control ass'y clockwise to strengthen the tension of an
upper thread; turn them counterclockwise to weaken the
tension. To control thread tension, adjust the tension
depending on the sewing conditions such as sewing
materials, threads, and stitch numbers.
18
Strong
Minor thread tension control ass' y
Weak
Strong
Major thread tension control ass' y
Weak
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