Spring lathe coiler

Spring lathe coiler

Weld Seam Detection in steel strips of a coil winding machine for automotive safety belt retractors.

This application demonstrates the detection of overlapping weld seams of spring steel strips.

The weld seams are not allowed to enter into the spiral winding machine. The distinctive feature of this application is the simultaneous weld seam detection of two strips by using only one eddy current encircling coil.

The spring coil winding machine for belt retractor operates in a start/stop mode to ensure a fixed length for each spring steel strip.

In this process it can happen that the weld seam stops inside the encircling coil. Even in this case the detection is successful because the weld seam detector detects the weld seam both in movement and also at standstill.