Warning
As the machine was set to the optimal status at the moment of factory shipping, do not adjust the machine
status optionally and when exchanging the parts, please change with the genuine parts that the company
authorizes.
1) Thread Tension Adjustment
A. Lower Thread Tension
Adjust tension of lower thread by turning the thread
tension adjusting screw
①
of bobbin case. Turning to the
clockwise direction, tension gets strong and turning to the
opposite direction, it gets weak.
[ Fig. 22 ]
[ Fig. 23 ]
Adjust tension of upper thread after adjusting the tension
of lower thread.
1. Put down the presser foot.
2. Adjust by turning tension adjusting nut
②
.
3. After adjusting tension of upper thread, check whether
rotary dish
③
rotates with the upper thread by pulling
the upper thread to the arrowed direction.
·
In case that it does not rotate, tighten the auxiliary
thread tension adjusting stud
④
.
B. Upper Thread Tension
[ Note ]
If tension of auxiliary thread adjusting device stud④ is too
weak, thread slides and so rotary dish③ becomes not to
rotate.
Auxiliary thread adjusting device stud should be adjust as
weak as possible that rotary dish③ rotates smoothly.
Use thread tension adjusting spring in accessory box in
case use thick thread or adjust upper thread tension
(Recommend three ply or thicker thread)
Strong
①
②
③
④
Weak
Strong
Strong
Weak
Weak
22
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