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Adjusting the Thread Tension 85

Adjusting the Thread Tension

The following procedure describes how to adjust the thread tension if the correct thread tension as described on
page 45 was not used. After adjusting the tension of the bobbin thread, adjust the tension of the upper thread for
each needle bar.

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.

Adjusting the tension of the
bobbin thread

Tie the included weight to the end of the
thread extending from the bobbin case.

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.

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.

Use the included standard screwdriver to turn
the tension-adjusting screw and adjust the
thread tension.

1 Tension-adjusting screw
2 Tighter
3 Looser

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