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1
6. HOW TO ADJUST THE THREAD TENSION
Bobbin
Bobbin case
Bobbin thread
tension adjustment
screw
2
Adjusting needle thread tension
First, adjust the right- and left-hands bobbin
thread tenson.
Then n accordance wth the bobbn thread
tension obtained, adjust the right- and
left-hand sides needle threads tension
approprately by turnng thread tenson
adjustments nuts
1
and
2
respectvely.
Turnng the nuts clockwse wll ncrease
the thread tenson or turnng them
counterclockwse to decrease t.
1
Adjusting bobbin thread tension
Turn bobbin thread tension adjustment screw
clockwse to ncrease the bobbn thread
tenson or turn the screw counterclockwse to
decrease t.
As shown in the left-hand figure, standard
bobbn thread tenson s 0.25 to 0.35N when
measurng wth the tenson gauge.