Singer 14J250 Stylist II Serger Instruction Manual - Page 47

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. 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) * II (B) * III (A) (A) (A)

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46
*
I
*
II
*
III
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 fabric to feed at different ratios.
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
(A)
(A)
(A)
(B)
(B)
(B)