least approximately parallel manner for effecting the vertical movement of the beam carrier 2 a guiding device 12 is provided which in this exemplary embodiment comprises a rocker 13 which is connected to a machine frame 15 via a rotary bearing 14 the free end of the rocker 13 is connected to the beam carrier 2 with the aid of a coupling kinematic mechanism 16 in this exemplary embodiment the coupling kinematic mechanism 16 is formed by a steering rod 17 and a second rocker 22 the second rocker 22 is held in a pivoting manner on the machine frame 15 at a distance from the first rocker 13 with the aid of a second rotary bearing 23 the free end of the first rocker 13 and the free end of the second rocker 22 are coupled to the steering rod 17 at a distance from each other by means of swivel joints 24 1 and 24 2 respectively the swivel joints 24 1 and 24 2 are formed at an end section of the steering rod 17 the opposite end section of the steering rod 17 is connected to the beam carrier 2 with the aid of a swivel joint 20 the swivel joint 20 is formed at the center of the beam carrier 2 the rocker 13 and the members of the coupling kinematic mechanism 16 are disposed above the beam carrier 2 for this purpose the rotary bearings 14 and 23 are disposed on the machine frame 15 between the connecting rods 7 1 and 7 2 of the vertical drive 5 this arrangement results in a very compact and narrow design the vertical drive 5 and the guiding device 12 thus form.