Feed ; Main ; Differential - Page 11

9

English

Differential feed

This serger is equipped with two sets of feed dogs 
under the presser foot to move the fabric through 
the machine. The differential feed controls the 
movement of both the front and the rear feed dogs. 
When set at 1, the feed dogs are moving at the 
same speed (ratio of 1). When the differential feed 
ratio is set at less than 1, the front feed dogs move 
slower than the rear feed dogs, stretching the 
fabric as it is sewn. This is effective on lightweight 
fabric that may pucker. When the differential feed 
ratio is set at greater than 1, the front feed dogs 
move faster than the rear feed dogs, gathering 
the fabric as it is sewn. This function assists in 
removing the rippling when serging stretch fabrics.

Differential feed adjustment

Feed 

ratio

Main 

feed 

(rear)

Differential 

feed (front)

Effect

Application

0.7 - 1.0

Material is 

pulled tight.

Prevents thin 

materials 

from 

puckering

1.0

Without 

differential 

feed.

Normal 

sewing

1.0 - 2.0

Material is 

gathered 

or pushed 

together.

Prevents 

stretch 

materials 

from 

stretching or 

puckering

The normal setting is 1.0 on the differential feed 
adjustment dial.
To adjust the diffrerential feed, turn the dial on the 
right bottom of the body.

1

2

<A>

1

 Less than 1.0   

2

 Greater than 1.0   <A> Selection mark

An example

When stretch material is sewn without using the 
differential feed, the edge will be wavy.

To get smooth finish, adjust the feed ratio from 1.0 
toward 2.0.  
(The feed ratio required depends on the elasticity 
of the material.)
The more elastic the material, the further toward 
2.0 the differential feed ratio should be set. Test 
sew with a scrap of the fabric to find the correct 
adjustment.

CAUTION

When sewing thick non-stretchable material such 
as denim, do not use the differential feed as it may 
damage the fabric.

Adjusting the presser foot pressure

Turn the pressure adjustment screw on the top 
left of the machine. You can adjust by referring the 
value on the screw.
The normal setting is "2".

1

2

<A>

1

 Less pressure

2

 More pressure

<A> Selection mark