19
Adjustments and settings
2
1.5
N(1)
0.7
E
F
Differential feed
There are two feed dogs one front (
C
) and one rear (
D
).
The two feed dogs move independently and the distance
each feed dog travels during one complete movement can
be adjusted. The differential feed prevents fluting or wav
-
ing in knitted or stretch fabrics and movements between
the layers of fabric. It also ensures pucker-free seams in
smooth fabric such as nylon or closely woven fabric.
Adjusting the differential feed
Simply turn the dial in the direction desired for fully variable adjustment
while sewing. Test sew.
G
H
J
I
Effect
Fabric
2
Wave-free seams (G)
Thick wool knits, hand knitted articles, very
stretchy fabrics
1.5
Wave-free seams (H)
Cotton, silk, synthetic jersey, sweatshirt fabrics
and fine knits
N Normal feed (I)
Woven fabrics
0.7 No puckering (J)
Fine nylon jersey, closely woven fabrics, lining
fabric satin, poplin
D
C
To increase
differential feed
amount
To decrease
differential feed
amount
Perfectly flat seams in knits or stretch fabrics.
The distance travelled by the front feed dog should be greater than that of
the rear feed dog. The front feed dog, therefore, feeds an amount of fabric
which the rear feed dog can take up behind the needle without stretching
the fabric. (
E
)
Pucker - free seams in nylon or closely woven fabrics.
The distance travelled by the rear feed dog should be greater than that of
the front feed dog. The front feed dog, therefore, holds the fabric back so
that the rear feed dog can take it up behind the needle without any pucker-
ing. (
F
)
Adjusting the differential feed
The differential feed can be adjusted by simply turning the differential feed
adjustment dial in the direction desired. Always make a trial run. The differential
feed is infinitely variable and can be adjusted while sewing.
*
The thread tension may vary depending on the differential feed adjustment
amount. In such a case, adjust the thread tension with the looper thread ten-
sion fine adjustment knob. (Refer to page 18).