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