Bernette b68 AIRLOCK - 3-Thread Overlock (LN) + Chainstitch (RC); 3-Thread Overlock (RN) + Chainstitch (RC)

Sewing Test
85
2022-05 EN 50400685.00A.04
Stitch Formation Measures
Chain looper (purple) thread loose
on the bottom side of fabric.
> Increase the CL Thread Tension (purple).
> Check threading path.
3-Thread Overlock (LN) + Chainstitch (RC)
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 (green) forms loops
on bottom side of the fabric.
> Reduce LL-thread tension (red).
> Increase RN-thread tension (green).
Chainstitch needle thread (yellow)
forms loops on the bottom side of
the fabric.
> Increase RC-Thread tension (yellow).
> Reduce the CL Thread Tension (purple).
> Reduce the stitch length SL.
> Check threading path.
Chain looper (purple) thread loose
on the bottom side of fabric.
> Increase the CL Thread Tension (purple).
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 RC-Thread tension (yellow).
> Reduce LN-Thread tension (green.
> Reduce the CL Thread Tension (purple).
> Set the differential feed between 1 and 0.6 (stretching).
> Reduce the stitch length SL.
3-Thread Overlock (RN) + Chainstitch (RC)
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 (green) forms loops
on bottom side of the fabric.
> Reduce LL-thread tension (red).
> Increase RN-thread tension (green).