20
4) Inserting upper thread
A. Place the thread take-up lever to the highest position and route the upper thread as in Figure. In case of thread guide on the
needle bar, route the thread as in Figure
①
.
[ Fig. 14 ]
5) Inserting lower thread and adjusting lower thread tension
A. Insert the bobbin
②
into the bobbin case
①
, insert the thread through the thread groove
③
and then make the thread pass under
the tension adjusting spring
④
. Turning the tension adjusting screw
⑤
clockwise will make the tension strong and turning the
screw counter-clockwise will make the tension weak. It is standard that, while you grab the end of the thread coming out of the
thread groove, the bobbin case
①
drops gradually by its own gravity. (See Figure 15)
B. Attaching and detaching bobbin case
Grab the bobbin case handle
⑥
and insert it into the hook. Grab the handle
⑥
and pull the bobbin to detach it. (The bobbin
②
will be detached, when the handle is let go of.) (See Figure 15)
[ Fig. 15 ]
Weak
Strong
④
③
②
①
①
⑤
①
⑥
For general materials
For heavy materials