Needle-Thread Tension Tolerance Range - Duerkopp Adler 550-767 Operating Instructions Manual

6.5

Needle-thread tension tolerance range

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In monitored seam ranges, the needle-thread tension values are
compared during operations with a pre-set tolerance range. If these
values deviate from the tolerance range more often than they should,
the seam is designated as a bad seam.
Adjusting the thread tension to within the tolerance range
The needle-thread tension value is affected by many factors such as
sewing speed, material, sewing yarn, seam range etc. The upper and
lower needle-thread tension limits can be set via the "ELTEX" function.
–
Press the "Check" field in the "Thread-tension measuring device"
window.
–
Press the "ELTEX" field.
3
2
–
Enter the appropriate values of the rupture seam in both the "Lower
limit" and "Upper limit" fields.
The entered tolerance range is indicated in window 2 within two
lines.
–
Enter the values for minimum and maximum speed.
–
Enter stitch length and stroke height.
–
Press the "Sew" field.
–
Carry out a test seam with thread-cutting.
The adjusted upper-thread tension is displayed in window 1.?
It must be within the two lines indicating upper an lower tension.
–
Adjust the upper-thread tension, press the "Sew" field and sew
another test seam.
–
Check the needle-thread tension in window 1.
–
The needle-thread tension values of each individual stitch are
displayed in field 3.
–
The average thread tension value calculated is displayed in the
"Average" field 2.
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