12
4) Inserting lower thread
KM-380BL
a. Inserting and removing bobbin case (Refer to Figure 11)
- The bobbin case
is removed from the hook when you grab and pull the bobbin case handle .
(The bobbin
is separated when you release the handle .)
- In case of inserting the bobbin case
, grab the handle and insert.
b. Inserting lower thread (Refer to Figure 11)
- Insert the bobbin
to the bobbin case . Then, insert the thread to the thread groove and place it under the tension
adjustment plate spring
.
c. Adjusting lower thread tension (Refer to Figure 11)
- The lower thread tension becomes stronger by turning the tension adjustment screw
clockwise, and it becomes weaker by
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
and lift the bobbin holder to
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
part of the thread path and under the tension spring plate . Then, Pull the thread end through the gap
between the hook and the opener . The adequate length of the pulled-out lower thread over the sliding plate is 50mm.
c. Adjusting lower thread tension
- Like in Figure 13, turning the tension adjustment screw
clockwise makes the lower thread tension winded to the bobbin
stronger and counterclockwise makes it weaker.
[Figure 12] [Figure 13]
About 50 mm
[Figure 11]
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