W6 W6 N 454D, Manual

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The 3-thread seam
This machine also allows you to sew a 3-thread seam. To do this, only insert the left needle (stitch
width approx. 7 mm) or the right needle (stitch width approx. 5 mm) and set the respective thread
tension. Make sure to retighten the needle clamp after removing a needle.
Correct thread tension Incorrect thread tension
Increase the thread tension for the needle
thread.
Incorrect thread tension Incorrect thread tension
Increase the thread tension for the upper looper
thread and/or decrease it for the lower looper
thread.
Decrease the thread tension for the upper
looper thread and/or increase it for the lower
looper thread.