SunStar SWF/B Series User Manual page 27

Threading the sub tension
adjuster
Thread guide disk
Wrap the 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 the sub and main thread 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, the
detector roller may not rotate well and make
wrong detections.
After adjusting the tension, check if the upper
thread tension is what can be pulled with little
force of around 100-120g.
[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
and fabric used.
Threading the thread
detector roller
Thread detector roller
Wrap the thread around the
detector roller one time.
Threading the main
tension adjuster
Rotary
tension disk
Wrap the thread 1.5 times
around the rotary tension
disk (V-shaped groove.)
Adjusting nut
Sub-tension
adjuster
Main tension
adjuster
5-9
Threading around the
needle
Thread holder
Thread guide
spring
(lower)
Fix the thread between the
upper thread holder spring
of the (lower) thread guide.
[Fig.5-12]
[Fig.5-13]