Definitions

One of the most important functions when punching from coil is the correct feed of the strip of material between 2 working strokes. If the strip is not fed forward enough, the parts punched at the following stroke are usually scrap. Especially with high-speed machines, the available time for the feed is tight; the feed must be ready before the tool closes again. Therefore, in most punching tools, sensors such as photoelectric barriers or inductors are mounted in the proper locations to check that the strip has been forwarded sufficiently. The query may, for example, be done at the front cutting edge of the strip or at an inserted reference edge in the strip. Decisive for the test accuracy is that the position of the sensor is set as accurately as possible to the sensing edge. For extremely precise feed controls, analog light barriers are availalbe, which provide an analog, proportional measurement signal depending on the degree of coverage of the light beam.

The processing of binary sensors and a convenient operation and setting of queries and query times via touch-screen are part of modern punching monitoring systems.