Brother PC660LA - Manual (Page 59)

Adjusting the Thread Tension 57
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Adjusting the Thread Tension
The tensions of the upper thread and of the bobbin thread (thread tension) should be adjusted so that they
are equal.
Thread tension
You may need to change the thread tension,
depending on the fabric and thread being used.
■ Correct thread tension
The upper thread and the bobbin thread should
cross near the center of the fabric. Only the upper
thread should be visible from the right side of the
fabric, and only the bobbin thread should be
visible from the wrong side of the fabric.
a Wrong side of fabric
b Right side of fabric
c Upper thread
d Bobbin thread
■ Upper thread is too tight
If the bobbin thread is visible from the right side
of the fabric, the upper thread is too tight.
Note
z If the bobbin thread was incorrectly
threaded, the upper thread may be too tight.
In this case, refer to “Installing the bobbin”
(page 26) and rethread the bobbin thread.
a Wrong side of fabric
b Right side of fabric
c Upper thread
d Bobbin thread
e The bobbin thread is visible from the right side of
the fabric.
■ Upper thread is too loose
If the upper thread is visible from the wrong side
of the fabric, the upper thread is too loose.
Note
z If the upper thread was incorrectly threaded,
the upper thread may be too loose. In this
case, refer to “Upper Threading” (page 28)
and rethread the upper thread.
a Wrong side of fabric
b Right side of fabric
c Upper thread
d Bobbin thread
e The upper thread is visible from the wrong side of
the fabric.
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