Abstract: Apparatus for handling or producing packs made of packaging material, it being the case that folding elements, pressure-exerting elements, push rods, slides etc. act on blanks of the packaging material. In order to convert any possible incorrect positioning of the moveable elements, in particular of the push rods, immediately into an error signal, a folding turret (10) is assigned a stationary monitoring unit (32) which is equipped with mechanical actuating elements, namely contact lugs (29,30,31). In the event of any possible incorrect positioning, one of the contact lugs (29,30,31) is actuated with the effect of a switching movement.