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21. Diff erential feed
The differential feed prevents seams from becoming wavy on knit fabrics
and prevents layers of fabric from slipping. It also prevents lightweight fab-
rics from puckering.
21.1. Functionality
The machine has two sets of feed dogs, one front set (A) and one rear set
(B). Both of these sets move independently. Due to the feed, both sets of
feed dogs can move at different speeds.
The feed can be set from 0.7 (negative feed) to 2.0 (positive feed).
B
21.2. Positive diff erential 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, prevent-
ing the fabric from becoming wavy.
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