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Positive differential feed
With positive differential feed, the front feed dogs
(A) move further than the rear feed dogs (B). This
"amasses" fabric under the presser foot, preventing
the fabric from becoming wavy.
Negative differential feed
With negative differential feed, the front feed dogs
(A) do not move as much as the rear feed dogs
(B). This stretches fabric under the presser foot,
offsetting unwanted puckering of the fabric.
Differential feed
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