Differential Feed - JUKI MO-1200QVP Manuel D'instructions

Adjustments and settings
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Differential feed

There are two feed dogs, one front (C) and one rear (D). The two feed
dogs travel independently and the distance each feed dog travels
during one complete movement can be adjusted. The differential feed
prevents fluting or waving in knitted or stretch fabrics and or closely
woven fabric (E).
Perfectly flat seams in knits or stretch fabrics
The distance travelled by the front feed dog should be greater than that
of the rear feed dog. The front feed dog therefore, feeds an amount of
fabric which the rear feed dog can take up behind the needle without
stretching the fabric.
Pucker-free seams in nylon or closely woven fabrics
The distance travelled by the rear feed dog should be greater than
that of the front feed dog. The front feed dog therefore, holds the fabric
back so that the rear feed dog can take it up behind the needle without
any puckering. (F).