Sewing test
65
2020-09 EN 5040064.00A.04
3-thread super-stretch / 2-thread wrapped overlock
With a balanced stitch formation, the Looper Thread (red) loops around the cutting edge.
The Needle Threads (green/yellow) create two straight lines of stitches on the right side of the stitch and
appear as dots on the wrong side of the stitch.
The elasticity of the 3-thread super-stretch can be increased by shortening the stitch length or by
reducing the Needle Thread Tension depending on the material and application.
Stitch pattern Solution
The Looper Thread is too loose around the
fabric edge.
> Increase the Lower Looper Thread Tension
(red).
> Increase the mtc Mircro Thread Control.
The Looper Thread is too tight around the
fabric edge.
> Reduce the Lower Looper Thread Tension (red).
> Increase the mtc Mircro Thread Control.
> Reduce the Cutting Width «CW».
> Check the Rolled Hem Selection Lever position
«N».
The Needle Thread forms loops on the wrong
side of the fabric.
> Increase the Needle Thread Tension (yellow,
green).
> Reduce the Lower Looper Thread Tension (red).
The fabric edge forms a tunnel or curls.
> Reduce the Lower Looper Thread Tension (red).
> Increase the mtc Mircro Thread Control.
> Reduce the Cutting Width «CW».
> Check the Rolled Hem Selection Lever position
«N».
The seam puckers.
> Reduce the Left Needle Thread Tension
(yellow).
> Increase the Right Needle Thread Tension
(green).
> Set the Differential Feed between 1 and 0.6
(Stretching).
> Shorten the Stitch Length «SL».
Tab.3: Optimizing the stitch: 3-thread super-stretch / 2-thread wrapped overlock
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