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7.8) Adjustment of Main Thread Adjusting
Device
1) Turn the tension adjusting nut ⓐ for the thread
adjusting device clockwise and the tension of the upper
thread gets stronger, and vice versa. Thread tension is
adjusted depending on sewing conditions including
fabric, thread, and stitch count. Therefore, adjust the
thread tension in line with situations.
2) The tension of the thread take-up spring can be
adjusted by inserting the screwdriver into the nut (b) on
the thread tension adjusting device shaft. When the nut
is turned clockwise, the thread tension spring tension
gets stronger, and vice versa.
7.9) Adjustment of Upper Thread Sensing
Device
1) With no thread placed on the thread take-up spring,
loosen the thread sensing plate screw and set the thread
take-up spring to contact the thread take-up sensing
plate. Then fasten the tightening screw.
2) When the thread take-up spring’s stroke is changed,
adjust the location of the thread sensing plate to make
sure that the thread take-up spring and the thread
sensing plate contact each other.
7.10) Thread Winder Adjustment
1) The wound thread volume on the bobbin can be
adjusted using the thread winder adjusting plate. When
the bobbin thread volume is high, loosen the tightening
screw and move the thread winder adjusting plate in
the A direction. When the wound thread volume on the
bobbin is small, turn the thread winder adjusting plate
in the B direction.
Tension adjusting nut
Thread sensing plate
Tightening screw
Thread take-up spring
Bobbin
Thread Winder Adjusting Plate
Make sure that the thread sensing plate does not contact other metals than the thread take-up
spring. If it does, thread might not be properly detected.
Caution
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