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6) How to Adjust the Tension of the Upper
Thread and the Lower thread
A. 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.
B. Adjusting the Tension of the Lower Thread
The lower thread becomes tight when tension
adjusting screw ① is turned clockwise, as shown in
the picture. When the screw is turned the other way
the lower thread is loosened.
[ Fig. 27 ]
[ Fig. 28 ]
②
④
①
①
③
5) How to Take the Bobbin Case On and Off
Hold knob ① of the bobbin case and push into the
shuttle until a click sound is heard.
[ Caution ]
If you start operating the machine when a bobbin case
is not perfectly installed, thread can be tangled of the
bobbin case would be protruded.
[ Fig. 26 ]
Bobbin Case
①
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