Singer One Instruction Manual 17 - Page 46
Idifferential Feed
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DIFFERENTIAL FEED The differential feed has two independent feed dogs, one front (A) and one rear (B). (B) Each feed dog has an individual feed mechanism which enables fabric to feed at different ratios. (A) 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 fabric under the presser foot to prevent the fabric from stretching. 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 the fabric under the presser foot to offset puckering. Illustration * I : Differential feed dogs * II : Positive differential feed *III : Negative differential feed 46 * I (B) (A) * II (B) (A) * III