Inserting Lower Thread - SunStar KM-380BL User Manual

4) Inserting lower thread

KM-380BL
a. Inserting and removing bobbin case (Refer to Figure 11)
- The bobbin case is removed from the hook
(The bobbin is separated when you release the handle .)
- In case of inserting the bobbin case , grab the handle
b. Inserting lower thread (Refer to Figure 11)
- Insert the bobbin to the bobbin case . Then, insert the thread to the thread groove
adjustment plate spring .
c. Adjusting lower thread tension (Refer to Figure 11)
- The lower thread tension becomes stronger by turning the tension adjustment screw
turning the screw counter clockwise.
- Adjust the lower thread tension to a degree that the thread get loosened by its own weight when you fall the bobbin case
grabbing the end of the thread.
KM-390BL
a. Removing bobbin
- Place the needle in the highest position, and then like in Figure 12, open the sliding plate
remove the bobbin .
b. Inserting lower thread
- Insert the bobbin winded up by thread into the bobbin case . As in Figure 13, pull out the lower thread by passing the
thread through the
between the hook and the opener . The adequate length of the pulled-out lower thread over the sliding plate
c. Adjusting lower thread tension
- Like in Figure 13, turning the tension adjustment screw
stronger and counterclockwise makes it weaker.
12
when you grab and pull the bobbin case handle .
[Figure 12]
part of the thread path and under the tension spring plate . Then, Pull the thread end through the gap
and insert.
clockwise makes the lower thread tension winded to the bobbin
[Figure 11]
and place it under the tension
clockwise, and it becomes weaker by
About 50 mm
[Figure 13]
and lift the bobbin holder
is 50mm.
to