3034D
常見問題&故障排除 |
Differential feed adjustment
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.
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.
Less than 1.0
Greater than 1.0
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.
When sewing thick non-stretchable material such as denim, do not use the differential feed as it may damage the fabric.