Summary

A small book press uses Safetinex light curtains for finger protection to monitor the press opening. Whenever a person’s hand is detected between the sender and the receiver unit, the book press will not operate; hence it will not present any hazardous situation to the operator.

Avantages pour le client

  • Meets highest safety requirements economically
  • Simple to combine with additional mechanical fencing when necessary
  • Reliable and adaptable
  • Easy to install
  • Fail-safe electronic design

Avantages spécifiques du produit

  • Certified CE, TÜV, and UL
  • IP 65 and IP 67 class protection
  • Category 4, PL e according to EN/ISO 13849-1
  • Type 4 according to EN/IEC 61496-1 and -2

Customer Application

With a pressing power of several tonnes, whenever the book press is operating, reaching inside the machine will most certainly result in serious injury to the person’s fingers or hand. The machine opening therefore needs to be monitored, preferably without mechanically blocking access.

Since the book pressing process can be instantly stopped in every operating phase by an electric signal, this application is suitable for protection by an active opto-electronic protective device. In addition, there is no danger from ejecting pieces and therefore no need for physical fencing.

Customer Solution

The Safetinex YBB-14 finger protection series satisfies the application perfectly. A pair of YBB-14#4-0150-G012 light curtains is installed to monitor the machine opening and prevent injuries due to reaching in during operation or starting the machine before fingers are at a safe distance from the press. A basic YRB-0131-241 safety relay is used in manual restart mode as the system switching device. The reliability of this protection system is guaranteed by a fail-safe electronic design with permanent autocontrol.

It is interesting to see that the machine opening is some centimeters higher than the protective height of the mounted safety light curtain. So in order to prevent reaching over the protective field and into the book press without detection, additional mechanical fencing (by means of a simple piece of Plexiglas) was mounted in this sensitive area.