Sewing Test
77
2022-05 EN 50400685.00A.04
8.4 Optimizing Stitches
4-Thread Overlock with Integrated Safety Seam
Stitch Formation Measures
Looper threads (red/blue) form
loops on the bottom side of fabric.
> Reduce LL-thread tension (red).
> Increase UL-thread tension (blue).
Looper threads (red/blue) form
loops on the top side of fabric.
> Reduce UL-thread tension (blue).
> Increase LL-thread tension (red).
Needle thread (yellow) forms loops
on bottom side of the fabric.
> Reduce LL-thread tension (red).
> Increase LN-thread tension (yellow).
Needle thread (green) forms loops
on bottom side of the fabric.
> Increase RN-thread tension (green).
The fabric edge forms a tunnel or
curls.
> Reduce UL-thread tension (blue).
> Reduce LL-thread tension (red).
> Increase the mtc micro thread control.
> Reduce the cutting width CW.
> Check the rolled hem selection N/R position.
The seam puckers.
> Reduce LN-thread tension (yellow).
> Reduce RN-thread tension (green).
> Set the differential feed between 1 and 0.6 (stretching).
> Reduce the stitch length SL.
3-Thread Super Stretch
Stitch Formation Measures
Looper thread (red) wraps fabric
edge too loosely.
> Increase LL-thread tension (red).
> Reduce the mtc mircro thread control.
> Increase the cutting width CW.
Looper thread (red) wraps fabric
edge too tightly.
> Reduce LL-thread tension (red).
> Increase the mtc micro thread control.
> Reduce the cutting width CW.
> Check the rolled hem selection N/R position.
The fabric edge forms a tunnel or
curls.
> Reduce LL-thread tension (red).
> Increase the mtc micro thread control.
> Reduce the cutting width CW.
> Check the rolled hem selection N/R position.
Needle thread (yellow) forms loops
on bottom side of the fabric.
> Reduce LL-thread tension (red).
> Increase LN-thread tension (yellow).
Needle thread (green) forms loops
on bottom side of the fabric.
> Increase RN-thread tension (green).
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