An apparatus for molding plastic preforms into plastic containers, includes a plurality of molding stations which are arranged on a movable carrier. The molding stations each include blow molds, within which plastic preforms can be molded into plastic containers by applying a flowable medium, as well as blow mold carriers for holding the blow molds, a clean room which at least partially surrounds the individual molding stations, so that the molding stations can be moved within the clean room, and a locking mechanism at least partially located within the clean room, to lock the two blow mold carrier parts together in a closed condition. The locking mechanism includes a first locking element that cooperates with a second locking element, the first locking element being arranged to be movable by a movement device that is supported by at least one bearing that is at least partially provided outside of the clean room.