21
B. Adjusting lower thread tension
As in Figure, turning clockwise the tension adjustment nut
①
of the bobbin case makes the lower thread tension
stronger and turning counter clockwise makes it weaker.
[ Fig. 17 ]
[ Fig. 18 ]
③
②
④
①
①
7) Adjusting tensions of upper and lower
thread
A. Adjusting upper thread tension
As in Figure, turning clockwise the tension adjustment nuts
③
,
④
of the major thread control assembly
①
and the
auxiliary thread control assembly
②
respectively makes the
upper thread tension stronger and turning counter clockwise
makes it weaker.
6) Attaching and detaching bobbin case
Hold the grip of the bobbin case
①
and insert it into the hook
until a click is heard.
[ Caution ]
If the machine operates without bobbin case fully
inserted, the thread may get tangled or bobbin case may
be detached.
[ Fig. 16 ]
Bobbin case
①
