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Alfa 3050 Manuel D'instructions page 20

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Raising and Lowering the Presser Foot
The Presser foot lifter raises and lowers the presser
foot.
You can raise the presser foot about 6 mm (1/4")
higher than the normal up position by exerting more
pressure when lifting the presser foot lifter. This
allows for easy removal of the presser foot and helps
you to place thick fabric under the foot.
Presser foot lifter
1
Normal up position
2
Extra lift
3
Balancing Thread Tension
Auto tension
This machine features an Auto setting in the tension
control, which covers a wide range of sewing
conditions. Set the tension regulating dial at "A" for
general sewing, unless specifically indicated in this
manual.
q
Tension regulating dial
w Setting mark
Balanced tension:
The ideal straight stitch has threads locked between
two layers of fabric.
For an ideal zigzag stitch, the bobbin thread does not
show on the right side of the fabric, and the needle
thread shows slightly on the wrong side of the fabric.
e
Needle thread
r
Bobbin thread
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Right side of the fabric
y
Wrong side of the fabric
Manual tension adjustment
Manual tension adjustment may be needed
depending on the sewing materials, layers of fabric
and other sewing conditions.
Needle thread tension is too tight:
-if the bobbin thread appears on the right side of the
fabric.
Loosen the needle thread tension by moving the dial
to a lower number.
Needle thread tension is too loose:
-if the needle thread appears on the wrong side of the
fabric.
Tighten the needle thread tension by moving the dial
to a higher number.
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