Baby Lock BL9 (BL9) Instruction and Reference Guide - Manual (Page 24)

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Balancing Needle Thread Tension
z Correct tension
The thread tension is adjusted depending on the
sewing materials, layers of fabric and sewing
method.
* The ideal straight stitch has threads locked
between two layers of fabric, as illustrated
(magnified to show detail).
* For an ideal zigzag stitch, the bobbin thread does
not show on the right side (top side) of the fabric,
and the needle thread shows slightly on the wrong
side (bottomside) of the fabric.
x Needle thread tension is too tight
The bobbin thread (bottom thread) will appear on
the right side (top side) of the fabric.......Loosen
the needle thread tension by moving the dial to a
lower number.
c Needle thread tension is too loose
The needle thread (top thread) will appear on the
wrong side (bottom side) of the fabric.......Tighten
the needle thread tension by moving the dial to a
higher number.
q Needle thread (Top thread)
w Bobbin thread (Bottom thread)
e Right side (Top side) of fabric
r Wrong side (Bottom side) of fabric
t Thread tension dial
y Setting mark
Thread Tension for Zigzag Sewing
To obtain better zigzag stitches, the upper
tension should be slightly weaker than in
the case of straight stitch sewing.
The upper thread should appear slightly
on the reverse side of the fabric.
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