How To Take The Bobbin Case On And Off; How To Adjust The Tension Of The Upper Thread And The Lower Thread - SunStar SPS/D-B1201 Series User Manual

7) How to take the bobbin case on and off

Opening the hook cover, hold the knob ① of
bobbin case and push into the shuttle until
sounding.
If you start operating the machine
when a bobbin case is not perfectly
installed, thread can be tangled of the
Caution
bobbin case would be protruded.

8) 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.
18
①
Bobbin Case
[ Fig. 22 ]
④
②
①
③
[ Fig. 23 ]
①
[ Fig. 24 ]