Differential Feed - Pfaff coverlock 4872 Instruction Manual

Differential feed
The differential feed consists of two feed
dogs (A
+
B), one behind the other, which
feed the fabric. The movement of the front
feed dog (A) and thus the amount of
material to be fed can be regulated using
the regulator wheel 49. The setting range is
between 0.5 and 2.0.
The standard setting is 10, where the
movement of the front feed dog (A) is
synchronized with the rear feed dog (B).
This means that the front feed dog feeds the
same amount of fabric as the rear feed dog.
Note:
The function of the differential feed is
independent of the set stitch length and the
type of fabric being used.
Set the regulator wheel for the differential
feed 49 to 0.5. Here the front feed dog feeds
half as fast as the rear feed dog. This means
that the front feed dog feeds only half as
much fabric as the rear feed dog, causing
the fabric to stretch.
Here you will avoid ruffling in the seam
when working with very light fabrics, such
as silk and taffeta. Instead, a smooth seam
(A) will be achieved.
You can also achieve fashionable effects
with the differential feed dog, for example
the wavelike effect when using a rib knit (B).
A
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