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2. Upper Thread Tension Adjustment
1) Arm thread guide (upper)
Arm thread guide (upper)① tension should be set lower
than the tension of the main thread tension control device
②. If you turn the nut③ clockwise, the tension would
increase. If you turn the nut counterclockwise, the tension
would decrease.
·After the upper arm thread guide is adjusted, the tension of the main thread adjusting devices② should
be reset.
Notice
2) Main thread adjusting device pulley
(1) The tension of the main thread adjusting devices①
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.
3) Supplementary thread adjusting device
(1) The supplementary thread adjusting devices① play a
supplementary role in strengthening thread tension in
a prompt manner.
(2) The tension of the supplementary thread adjusting
devices① should be set lower than that of the main
thread adjusting devices②. The tension can be turned
on/off with the functional switch.
(3) The tension of the supplementary thread adjusting
device gets stronger when it is turned clockwise. It
gets weaker when the device is turned counter-
clockwise.
26
①
③
②
①
②
①
[ Figure 33 ]
[ Figure 34 ]
[ Figure 35 ]
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