Winding Lower Thread; Routing Lower Thread - SunStar KM-857 Series User Manual

3) Winding lower thread

(1) Winding the lower thread
A) Insert the thread into the hole ①, and put it around the
back of tension adjustment plate ② to the front side.
B) Bring the thread towards the bobbin ③, and wind it
around 5~6 times starting from the bottom.
C) Push the lever ④ to make the pulley ⑤ touch the V-
belt, and then operate the machine.
D) When the lower thread is fully wound to the bobbin,
pulley ⑤ will automatically detach from the V-belt.
E) The adequate amount of thread wound to the bobbin
is about 80%. [See figure 21]
(2) Adjustment of lower thread winding.
A) If the lower thread winds irregularly, unfasten the screw ⑥, and adjust by moving to the left and right. Fasten back the
screw ⑥ when the adjustment is complete.
B) The amount of lower thread wound increases when the adjusting screw ⑦ is turned clockwise, and decreases when
turned counter clockwise.
C) The tension of the lower thread wound to the bobbin grows when the nut ⑧ is turned clockwise, and drops when
turned counter clockwise.

4) Routing lower thread

[Applied Model Types]
A. KM-857
B. KM-867
A. Insert the bobbin ① into the hook ②.
B. Insert the thread through "A" part of the hook ②, and pull it out
from the end of the lower thread tension adjustment plate ③.
C. The adequate length of the pulled-out lower thread is 50mm.
▶When adjusting the tension of the lower thread, be sure to switch off the power supply. If
the user steps on the pedal by mistake, the machine will start automatically, and this might
lead to physical injuries.
▶When using the clutch motor, remember that the motor revolves for a while even after
switching off the power supply due to inertia. Make sure to start working only after the
motor has come to a complete stop.
①
②
"A"
③
⑤
Caution
[Applied Model Types]
A. KM-857-7
B. KM-867-7
③
A. Insert the bobbin ① into the bobbin case ②.
B. Insert the thread through "A" part of the hook ②, and pull it out
from the end of the lower thread tension adjustment plate ③.
C. Pass the pulled-out thread through "B" of the bobbin case ②, and
insert it into the hook.
D. The adequate length of the pulled-out lower thread is 50mm.
②
①
⑧
⑥
③
⑦
80%
④
[Figure 21]
"B"
②
"A"
①
17