19
①
6) How to Take the Bobbin Case On
and Off
7) How to Adjust the Tension of the
Upper Thread and the Lower Thread
[ Fig. 16 ]
Hold knob ① of the bobbin case and push into the
shuttle until a click sound is heard.
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. 17 ]
[ Fig. 18 ]
[ Caution ]
If you start operating the machine when a bobbin
case is not perfectly installed, thread can be tangled
or the bobbin case would come out.
Bobbin Case
②
④
①
③
①
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