5-10
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 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.
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.5-12]
[Fig.5-13]
Thread Guide Disk
(Pass through the
middle of shaft)
Rotary Tension Disk
Thread guide
(lower)
Upper thread
holder spring
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 in the groove.
Wrap the thread clockwise
around the thread guide
disk.
Wrap the thread once
around the detector roller
in the groove.
Feed the thread through
the thread guide (lower)
and fix it at the upper
thread holder spring.
Thread Sensing Roller
One turn
Adjusting nut
Sub-tension
adjuster
Main
tension
adjuster
[CAUTION]
①
If tension at the sub adjuster is too loose, the
detector roller may not rotate well and make
wrong detections.
②
After adjusting the tension, check if the upper
thread tension is what can be pulled with little
force of around 100-120g.
[CAUTION]
①
After adjusting the tension, pull the upper thread
to see if the detector roller rotates well.
②
Adjust the tension according to the type of thread
and fabric used.
One and
half turn
