Definitions

Punching tools are often tested by special sensor scannings to find out whether the finished stamped parts have actually left the tool after the working stroke. Here mostly inductive sensors are used in flat or annular form, which are mounted in the ejection zone of the tools and switch in the presence of metal. If the stamped part passes the sensor in the specified crank angle range, the sensor switches and signals "ok". If the signal fails, the last stamped part is probably still in the tool and can do considerable damage during the following stroke. The machine must now be stopped immediately and the cause of the error must be eliminated.

Modern monitoring systems offer different query models for ejection control in order to be able to react appropriately to all peculiarities of the part ejection. In some tools, the finished stamped parts are still in an ejection chute and fall rather irregular from the tool. In this case, for example, the query can be set so that at least every 3 strokes one or more parts must have passed the ejection sensor.