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Three causes of skip stitches in vehicle seats processing:

1. Different heights of material layers

The thinner material layers flutter under the presser foot. The material layers that are not held by the presser foot are moving together with the upward stroke of the needle and thus reduce the needle thread loop. This prevents or reduces the loop formation to such an extent that the hook can no longer pick up the loop.

2. Cross seams

In this case the fluttering is caused by the transition between thick and thin (or thin and thick) material layers. Again, the needle thread loop is reduced by the material layers that are no longer held by the presser foot, so that the hook cannot catch the loop.

3. Needle deflection

Another cause of skip stitches is deflection of the needle with extremely thick material layer transitions, which prevents the hook from picking up the loop.

The cause of needle breakage in vehicle seat production:

Extreme needle deflection

With extremely thick material layer transitions, such as sewing over heavy cross seams, the needle is deflected from its correct penetration path. When the point of the needle comes into contact with the hook or other parts of the machine, the needle breaks.

For this case SCHMETZ has the solution: SERV 7 needle

The SERV 7 needle has a conically reinforced blade for higher needle stability and to prevent skip stitches. Moreover, it contributes with its optimized scarf shape to form a reliable loop and to prevent skip stitches even under extreme sewing conditions.

Applications in the manufacture of vehicle seats:

Vehicle seat covers (car, aircraft, train, etc.) · Headrests · Laminated textiles · Material combinations, e.g. textile and plastic profiles, textile and cardboard · Thick and thin layers of material