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Sewing Test
90
Stitch Formation
Upper looper thread (blue) wraps
fabric edge too tightly.
Lower looper thread (red) not
straight along the needle thread.
The seam puckers.
Needle thread (green) forms loops
on bottom side of the fabric.
Measures
> Reduce UL-thread tension (blue).
> Reduce the stitch length SL.
> Increase LL-thread tension (red).
> Increase RN-thread tension (green).
> Set the differential feed between 1 and 0.6 (stretching).
> Reduce LL-thread tension (red).
> Reduce RN-thread tension (green).
> Reduce the stitch length SL.
> Increase RN-thread tension (green).
2022-05 EN 50400685.00A.04
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