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6.2.4) 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.
6.2.5) Operation of thread adjusting device
The main and supplementary thread adjusting
devices①,② are automatically in operation.
※ When trimming or auto presser bar lift③ is
activated, the tension of the main and
supplementary thread adjusting devices is
released. The supplementary thread adjusting
devices① can be turned on/off with the
functional switch④.
6.3) Adjusting upper thread length after
trimming
1) During the trimming process, main thread release
tension is not created but only auxiliary thread
release ① tension is created.
2) The adequate length of upper thread after trimming
is 50 ~ 60mm.
3) Increasing auxiliary thread release ① tension will
make upper thread after trimming short and
decreasing the tension will make it long.
①
②
④
①
②
[Fig. 6-5]
③
[Fig. 6-6]
①
[Fig. 6-7]
29
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