ENGLISH
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.
Illustration *
: Differential feed dogs
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: Positive differential feed
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: Negative differential feed
42
B
A
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