may also be separated from each other such positioning may also apply correspondingly to molding tools 10 a mounted opposite each other as is also to be seen in fig2 a monitoring assembly 50 is provided it is spring loaded and may be displaced longitudinally from its locking position illustrated in fig2 into a release position preferably from the exterior by an actuator in particular one in the form of a pneumatic cylinder or the like the body of rotation 26 accordingly has on the external circumference side a first recess 52 corresponding to the closing position of the molding tools 10 10 a if locking occurs in this locking position that is if parts of the monitoring assembly 50 are engaged in the associated recess 52 in the body of rotation 26 it is made certain that a locking position has been assumed along the closing separation line i i by the molding tools 10 10 a and that the machine control unit then recognizes that a reliable molding process is possible if as a result of an error the proper closing position is not assumed the monitoring assembly 50 ascertains this and the molding process could be halted without damage to the molding device the reset opening position area for the molding tools 10 10 a may also be monitored synchronously by the monitoring assembly 50 by a recess not shown positioned diametrically opposite recess 52 in addition the drive shaft 46 is mounted on the end side so as to be rotatable by additional bearings 54 in the machine frame.