5-11
Adjusting nut
Sub-tension
adjuster
Main
tension
adjuster
2) Upper Thread Tension Adjustment
①
The upper thread tension is controlled by the
sub and main thread tension adjusters. Turn
clockwise to increase the tension and counter-
clockwise 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.
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.
[Fig.5-13]
[Fig.5-14]
Thread Guide Disk
(Pass through the
middle of shaft)
Rotary Tension Disk
Thread holder
spring
Thread guide
(lower)
Threading the sub
tension adjuster
Threading the main
tension adjuster
Threading the thread
detector roller
Threading around the
needle
Wrap the thread 1.5 times
around the rotary tension
disk (V-shaped groove.)
Wrap the thread
clockwise around the
thread guide disk.
Wrap the thread around
the detector roller one
time.
Fix the upper thread
between the thread
holder spring of the lower
thread guide.
Thread Sensing
Roller
One turn
One and
half turn
