Tension Control On Upper Thread - SunStar SWF/B Series User Manual

TENSION CONTROL ON UPPER THREAD

Proper tension is an important factor in producing quality embroidery. If the upper tension is too loose,
looping and thread breaks may occur. If the tension is too tight, thread and needle breaks may occur as well
as puckering. A balance of 2/3 upper thread and 1/3 lower thread generally indicates good tension.
1) The upper thread tension is controlled by turning
the adjusting nut on the sub-tensions (pre-
tensioners) and the main tension adjusting
device. Turn clockwise to increase the tension
and counterclockwise to decrease the tension.
2) The sub-tension adjusters or pre-tensioners
should control about 2/3 of the tension while the
main tension adjusting units should handle the
other third. The pre-tensioners should be
adjusted so that the upper thread flows smoothly
through the disks and into the rollers of the main
tension adjusting units. The main tensioners are
used to fine tune the tension.
You should have to use some force to pull the thread through the tension units if
adjusted correctly.
The tension should be around 100-120g.
WARNING
3) After the tension is adjusted on both the pre-tensioners and the main tension adjusting units, adjust the
tension settings on the pre-tensioners again if the tension is too light to allow for the upper thread flow.
Adjust the thread tension according to the type of thread used and target fabric.
WARNING
Adjusting nut
Sub tension
adjusting
device
Main
tension
adjusting
device
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