20. Differential feed
* There are two feed dogs one front and one rear.
The two feed dogs move independently and
the distance each feed dog travels during one
complete movement can be adjusted.
(1) Stretching effect
* To stretch the fabric select a number from N to 5 in
the section “ “.
* This prevents fine nylon jerseys or closely woven
fabrics from puckering.
(2) Pushing effect
* To prevent waving or to gather select a number from
N to 8 in the section “ “.
* This prevents waving or fluting in knits or puckers
in fine woven fabrics. It also can be used to gather
single layers of fine woven fabric.
Note:
When sewing without differential feed the dial should
be on position N.
(3) Gathering
* Use the differential feed to gather a single layer
of fabric.
For example sleeve heads, yokes, lace edging or
frills.
Adjustment:
Stitch: 4-thread overlock
Differential feed: 8
Stitch length: N-4
Thread tension: 3-5
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