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28. DIFFERENTIAL FEED
The differential feed system consists of two sets of
feed teeth arranged one behind the other. Both feed
teeth work independently of each other to give
perfect results when sewing on speciality fabrics.
When the amount of feed by the front feed teeth is
changed in relation to the feed by the rear feed
teeth it will "stretch" or "gather" the fabric.
Use the differential feed to prevent stretching of knit
fabrics and puckering of lightweight fabrics.
For overlock stitching on normal fabric, set the
differential feed adjusting dial to N.
(1) GATHERED OVERLOCK (STRETCH, KNIT
FABRICS)
When overlocking stretch fabric, such as knits and
jersey, adjust the differential feed to a value
between N and 2.0. The setting depends on the
material being sewn as well as the desired amount
of gathering. Test sew with different settings before
sewing on your garment.
(2) STRETCH OVERLOCK (LIGHTWEIGHT
FABRICS)
When overlocking light woven or loosely knit fabrics,
such as silk and silky knitwear, adjust the differential
feed to a value between 0.6 and N. When sewing,
apply gentle tension to the fabric by holding the
seam lightly in front and back of the presser foot.
The setting depends on the material being sewn as
well as the desired amount of stretching. Test sew
with different settings before sewing on your
garment.
0.6
0.8
N
1.5
2.0
Fabric
Stretch Fabric
( Knit, Jersey)
Non-Stretch
Fabric ( Chino,
denim)
Light weight
Fabric ( Silk,
silky, knitwear)
1 6
8
Adjustment
Differentiial Feed-N
N-2.0
N
0.6-N
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