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5.3.3)
How to Take the Bobbin Case On and Off
Hold knob of the bobbin case and push into the
shuttle until a click sound is heard.
5.3.4) How to Adjust the Tension of the Upper
Thread and the Lower thread
1) Adjusting the Tension of the Upper Thread
When the tension adjusting nuts ③ and ④, of
thread tension adjusting unit ① and sub-tension
adjusting unit ②, are turned clockwise the upper
thread is tightened. And loosens when turned the
other way around.
2) Adjustment of Main Thread Adjusting Device
A. When the tension adjusting nut① for the thread
adjusting device is turned clockwise, the tension
of the upper thread gets stronger. Otherwise, the
tension gets weaker. The thread tension
adjustment can vary depending on sewing fabric,
thread, and number of stitches. Please make the
adjustment in line with the sewing conditions.
B. The thread take-up lever spring's tension can be
adjusted using the groove② at the end of the
thread tension adjusting device shaft. When it is
turned clockwise, the tension of the thread take-
up spring gets stronger, and otherwise, it gets
weaker.
3) Adjusting the Tension of the Lower Thread
The lower thread becomes tight when tension
adjusting screw is turned clockwise, as shown in
the picture. When the screw is turned the other
way the lower thread is loosened.
If the bobbin case and the hook are not accurately assembled, thread might be entangled or the
bobbin case might be ejected during machine operation. Make sure that the bobbin case is
completely inserted into the hook before operating the machine.
Caution
Tension Adjusting
Screw
Tension Adjusting Nut
Bobbin Case
Handle
①
③
④
②
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