SunStar KM-1172BLX User Manual page 30

6.2.1) Tension adjustment of the lower thread
If you turn screw② on the spring plate① mounted
in hook in a clockwise direction, the lower thread
tension will become stronger and when turned in a
counterclockwise direction, weaker.
6.2.2) Thread Trimming Sub Thread Tension
Adjusting Device
The tension of thread trimming sub thread tension
adjusting device① should be set lower than the
tension of main thread tension adjusting device②.
Turn the nut③ in a clockwise direction to increase
the tension and turn it counter-clockwise to decrease
the tension.
Readjust the tension of main thread tension adjusting device② after adjusting thread trimming sub
thread tension adjusting device.
Caution
6.2.3) Main thread adjusting device
1) The tension of the main thread adjusting devices
① should be set at the minimum as possible.
2) Loops should be created at the center of the
sewing material. Make sure that thread break
does not occur on the ultra light material due to
strong thread tension.
3) Adjust the main thread adjusting devices① to
create stitches at regular length. When the nut is
turned clockwise, the tension increases. When the
nut is turned counter-clockwise, the tension
weakens.
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①
②
③
[Fig. 6-2]
①
②
[Fig. 6-3]
①
[Fig. 6-4]