Roll Hemming; Roll Hemmer; Preparation For Roll Hemming; Standard Thread Tension List For Roll Hemming - JUKI MO-644DN Instruction Manual

Roll hemming

A
B

Roll hemmer

The roll hemmer is built-in to the sewing machine. The fabric edge is automatically rolled and oversewn. The result is a
very fine and narrow edge finishing.

Preparation for roll hemming:

1. Remove the left-hand needle and thread the machine as for 3-thread overlocking.
2. Set the lower knife adjusting knob at "1 - 2".
3. Turn the overlocking width selection knob toward you to align with the red marking in front of the throat plate.
4. Set the stitch length adjusting knob at "1 - 1.5".
* Adjust the thread tensions as desired.
(A): Rolled hem
Rolled hemming stitch sews the fabric edge with the upper looper thread.
(B): Narrow overlock stitch
Narrow overlock stitch is to sew normal overlock stitches of which cutting width is narrower than usual.

Standard thread tension list for roll hemming

◦ Thread tension slightly differs depending on the types of the fabric and thread.
◦ Use the woolly nylon thread or thinner thread for roll hemming to attain the beautiful finish.
◦ Use the thin spun thread thinner than #80.
◦ Woolly nylon thread can be used only for the upper looper.
* Adjust the thread tension as desired.
Thread tension dial val-
ue
Thread to be used
Spun thread #80
Filament thread #80
Wooly nylon thread
①
For rolled hem
Right-hand Upper loop-
needle er
4 - 6 3 - 5
3 - 5
3 - 5
3 - 5
②
(rolled hem, narrow overlock sitich)
Lower loop- Right-hand
er needle
7 - 9
6 - 8
③
MO-654DEN
④
For narrow overlock stitch
Upper loop-
er
4 - 6 5 - 7
3 - 5
3 - 5
3 - 5
MO-644DN
④
Lower loop-
er
4 - 6
3 - 5
26