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(1) Bobbin thread tension
Adjust the bobbin thread tension with the thread tension adjusting screw (NO.2) on the
bobbin case (NO.1). The thread tension becomes loose if turn the thread tension adjusting
screw (NO.2) to the counterclockwise, and the thread tension becomes tight if turn it to the
clockwise.
(2) Upper thread tension
Adjust the upper thread tension based on the bobbin thread tension.
For this adjustment, turn the thread tension adjusting nut (NO.3). The upper tread tension
becomes tight if turn the thread tension adjusting nut (NO.3) to the clockwise, and the
upper thread tension becomes loose if turns it to the counterclockwise.
○
○○
○ ×
××
× ×
××
×
Well balanced
tension
The upper thread is tight
or the bobbin thread is loose
The upper thread is loose
or the bobbin thread is tight
1
2
3
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