safety bracket movably supported relative to the doors and or the positionable machine parts and configured such that it can only be closed when all the doors are closed and all the machine parts are at an operating position and a central safety switch which monitors the position of the central safety bracket application_number US 201414302062 A description the present invention was realized for simplifying and thus improving and rendering safer the protection mechanisms of machines with fast moving and rotating components for protection against collisions with objects or operating staff it is a central concept of the present disclosure to monitor and secure closable inspection openings and inspection positions of machine components by a central safety bracket in combination with a central safety switch that is in the closed condition of the safety bracket it will be impossible to open the inspection doors or to change the position of machine parts vice versa the safety bracket cannot be closed and the machine cannot be started when doors are open and machine parts do not occupy their operating position this concept will exemplarily be described in the following description on the basis of a cold glue unit used for applying labels to bottles and other containers this concept of the present disclosure.