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The following procedure describes how to adjust the thread tensions. After adjusting the tension of the
bobbin thread, adjust the tension of the upper thread for each needle bar.
Adjusting the tension of the
bobbin thread
a
Tie the included weight to the end of the
thread extending from the bobbin case.
b
As shown in the illustration, hold the
bobbin case against a smooth vertical
surface.
• If the thread with the weight attached is slowly pulled
out, the thread tension is correct.
c
Use the included standard screwdriver to
turn the tension-adjusting screw and adjust
the thread tension.
1 Tension-adjusting screw
2 Tighter
3 Looser
Adjusting the Thread Tension of both the Bobbin and
Upper Thread
Note
• Be sure to check the tension of the bobbin thread each time that the bobbin is changed.
Depending on the bobbin thread type and whether a prewound bobbin is used, the tension of the
bobbin thread may differ. For example, when replacing an empty prewound bobbin with one of the
same type, be sure to check the tension of the bobbin thread and adjust the tension if necessary.
• Be sure to adjust the tension of the bobbin thread before adjusting the tension of the upper thread.
Note
• Different weights are used to adjust pre-
wound bobbins and metal bobbins.
Pre-wound bobbins: Only weight (L)
Metal bobbins: Weight (L) and weight (S)
* Weight (S) is included with the optional
bobbin winder.
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