Treatment machine for containers and methods for monitoring the treatment machine

describes a treatment machine for containers, in particular for printing of the containers, with a transport means for transporting the containers along a transport path and a method for monitoring the treatment machine. According to the invention a stationary scanning device is provided at least for scanning a profile line portion of an envelope, which is the properly transported by a container type and / or set by properly mounted Rustelementen. Further, the scanning device is configured such that it outputs a control signal upon exceeding the lateral profile line portion in the direction of a treatment unit.