Operating instructions

6.5 Needle-thread tension tolerance range

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 w ithin 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.

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Press the “Check” field in the “Thread-tension measuring device”

window.

–

Press the “ELTEX” field.

–

Enter the appropriate values of the rupture seam in both the “Lower

limit” and “Upper limit” fields.

The entered tolerance range is indicated in w indow 2 within two

lines.

–

Enter the values for minimum and maximum s peed.

–

Enter stitch length and stroke height.

–

Press the “Sew” field.

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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

displayedinfield3.

–

The average thread tension value calculated is displayed in the

“Average” field 2.