Strip Centering on welding machines and stitchers
Perfect positioning of the strip
The start and end of a strip are joined together in the inlet area of continuous strip processing lines. This is conducted by means of stitchers or welding machines, depending on the strip material, strip thickness and the type of system used.
Modern stitchers and welding machines include fully automatic centring devices upstream and downstream of the stitcher or welding machine respectively. Mechanical edge centring devices are predominantly used, which always entail the risk of damaging the strip edge. EMG's space-saving solution for aligning the tail end of the strip with the start of the new strip has often proved to be a suitable method, particularly when retrofitting a system.
The illustration shows the space-saving EMG solution for the alignment of the passed strip end to the new strip head. It is very successfully used - especially for retrofitting. The strip width for the passed strip and for the new strip is measured with the optical sensor system BREIMO  in front of the welding or stitching machine. In addition, the position of the head of the new strip is determined with the EVK [2.1] and additionally the angular position of the new strip is determined by taking into account the BREIMO values.
The centring of the passed strip in relation to the strip axis and angular position of the new strip is then carried out via a centring frame , which picks up and centres the strip with one or, in the case of thicker strips, with two clamping bars. The position and angular position of the passed strip is measured using two further EVKs [2.2] and [2.3].
The system can also be designed for bringing the strip head of the new strip in line with the strip tail end of the passed strip.
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