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2) Adjusting thread take up lever spring tension
Adjust major thread tension control ass'y shaft by turning
a bolt with a driver. Turn the bolt clockwise to strengthen
the tension of a thread take up lever spring; turn it
counterclockwise to weaken the tension. (Standard
moving length: 6~8mm, tension: 30~50g)
3) Adjusting lower thread tension
Turn tension adjusting screw of bobbin case clockwise
to strengthen the tension of lower thread; turn it
counterclockwise to weaken the tension.
4.4.4) How to wind lower thread
1) Insert bobbin to bobbin winder drive shaft of bobbin
winder base attached to a top cover.
2) Attach bobbin winder lever on bobbin, and press pedal to
operate machine.
3) After bobbin winder lever falls from bobbin, use a
bobbin winder knife to cut the thread.
Strong
Weak
Thread take up lever spring
Weak
Strong
Tension adjusting
screw
19
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