SINGER 14T968DC - Manual (Page 34)

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Differential feed is a system which "stretches" or
"gathers" the fabric, when the amount of feed of front
feed dogs in relation to the rear feed dogs is changed.
The differential feed ratio ranges from 1:0.6~1:2.0.
Adjustment is made by means of the differential feed
adjusting dial pictured at right.
Use of differential feed is very effective in overedging
stretch fabrics and fabrics cut on the bias.
Setting "N" is differential feed adjusting dial
setting for ratio 1:1.
Gathered overedge is most suited for shirring
sleeves, yokes, front and back bodices, skirt hems,
etc. in stretch fabrics such as knits and jersey before
assembling into garment.
Set differential feed adjusting dial below
setting "N". Setting of adjusting dial
depends on material being sewn as well as the
amount of desired gather. Therefore, set dial to suit the
fabric and test sew before sewing your garment.
Note: For normal overedge stitching, set differential
feed adjusting dial to graduation "N".
0.8
0.6
N
1.5
2.0
N
0.8
0.6
2.0
1.5
To set the differential feed adjusting dial for gathering
Gathered Overedge
17. DIFFERENTIAL FEED