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FOUR THREAD OVEREDGING STITCH USING 2 NEEDLES
6. Adjustments for the Differential Feed Ratio
Refer to the below chart and test stitch performance on a scrap of material you are going to use.
Differential feeding performs the function of
stretching or condensing the edge of the fabric,
since two independent feed dogs, one in front
and one behind the needles, can be adjusted
to feed at differential feed ratio.
The function has the effect of producing a
neat finish of overedging for stretchable and
condensable fabrics.
倩 "N" indicates the neutral position on the
differential feed adjusting dial.
Differential feed
adjusting dial
Fabric
Differential feed
ratio is set "N"
Differential
feed ratio
Result of
adjustment
Stretchable
materials
Knit
Jersey
N-2
Unstretchable and
incondensable
materials
Medium woven
fabrics
N
Condensable
materials
Georgette 0.7-N
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