3-Thread Narrow Seam - Bernette Airlock b64 User Manual

Sewing test
64

3-Thread Narrow Seam

With a balanced stitch formation, the looper thread (blue/red) are intertwined at the fabric edge.
The needle thread (green) is identifiable on the top side of the stitch as a straight line and on the bottom side
of the stitch as points.
Stitch pattern
The looper threads are intertwined on the
wrong side of the fabric.
The looper threads are intertwined on the
right side of the fabric.
The right needle thread forms loop on the
wrong side of the fabric.
The fabric edge doesn't curl as intended.
Tab. 2: Optimizing the stitch: 3-Thread Narrow Seam
Recommendation
> Reduce the lower looper thread tension (red).
> Increase the upper looper thread tension (blue).
> Reduce the upper thread tension (blue).
> Increase the lower looper thread tension (red).
> Increase the right needle thread tension
(green).
> Increase the upper looper thread tension (blue).
> Increase the lower looper thread tension (red).
> Increase the cutting width «CW».
> Shorten the stitch length «SL».
> Check the rollhem selector lever position «R».
2020-09 EN 5040064.00A.04