SunStar SWF/B Series User Manual page 30

Threading the sub tension
adjuster
Thread Guide Disk
(Pass through the
middle of shaft)
Wrap thread clockwise
around the thread guide
disk.
2) Upper Thread Tension Adjustment
Thread tension adjustment is critical for producing high quality of the embroidery. A balance of 2/3 upper thread and
1/3 lower thread generally indicates good tension. If the tension is too loose, the upper thread will loop, causing thread
tangles or breaks. If the tension is too tight, puckering may occur as well as thread and needle breaks.
① The upper thread tension is controlled by turning the
adjusting nut on the sub and main tension adjusters. Turn
clockwise to increase the tension and counterclockwise to
decrease the tension.
② The sub-tension adjusters should control about 2/3 of the
thread tension while the main adjuster should handle the
other 1/3. Set the sub-tension adjuster so the upper thread
flows smoothly through the rotary tension disks and into
the rollers of the main tension adjuster.
[ Caution ]
If tension at the sub adjuster is too loose, detector
roller may not rotate well and make wrong
detections.
After adjusting the tension, make sure that tension
of the upper thread should be what can be pulled
with as little as 100-120g of force.
[ Caution ]
After adjusting the tension, pull the upper thread to
see if the detector roller rotates well.
Adjust the tension according to the type of thread
used and target fabric.
Threading detector roller
Thread Sensing
Roller
One turn
Wrap thread around the
detector roller one time.
Threading the main tension
adjuster
One and
half turn
Rotary Tension Disk
Wrap thread 1.5 times
around the main tension
adjuster (in V groove.)
Adjusting nut
sub-tension
adjuster
main
tension
adjuster
Threading around the needle
Thread
Thread guide
hook spring
(lower)
Fix upper thread on the
thread hook spring of the
lower thread guide.
[Fig. 5-10]
[Fig. 5-11]