MODEL 3128
8
BOBBIN TENSION
TO CHECK:
Set the bobbin in the bobbin case and pass the thread (cotton #50) through the tension spring.
The bobbin thread tension should be 45 - 55g when pulling the thread in the direction of "A".
If the tension is out of the range, adjust it as follows:
ADJUSTMENT PROCEDURE:
1. Turn the adjusting screw "B" in the direction of "C" when the bobbin thread tension is too
tight.
2. Turn the adjusting screw "B" in the direction of "D" when the bobbin thread tension is too
loose.
MECHANICAL ADJUSTMENT
COTTON THREAD #50
A
B
C
D
