23
DIFFERENTIAL FEED
The differential feed has two independent feed dogs, one
front (A) and one rear (B).
Each feed dog has an individual feed mechanism which
enables the feeding of material at a different ratio.
POSITIVE DIFFERENTIAL FEED
WHEN SET FOR POSITIVE DIFFERENTIAL FEED, the front
feed dog (A) makes a longer stroke than the rear feed dog
(B).
This has the effect of accumulating material under the
presser foot to offset the wavering on the fabric.
NEGATIVE DIFFERENTIAL FEED
WHEN SET FOR NEGATIVE DIFFERENTIAL FEED, the front
feed dog (A) makes a shorter stroke than the rear feed dog
(B). This has the effect of stretching material under the
presser foot to offset the puckering on the fabric.
Differential feed dogs
B
A
Positive differential feed
Negative differential feed
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