frame and a second and third track 12555 being disposed laterally to the first track the carriage 12552 has at least two axes of rotation 12557 12558 a first axle 12557 driving at least one first wheel 12554 in the first guiding track 12556 and a second axle 12558 driving at least one second and at least one third wheel 12553 in the second and third guiding track 12555 respectively the two axes of rotation 12557 12558 are perpendicular in this way all the desired degrees of freedom are advantageously achieved double vertical horizontal pivoting of the carriage about the axes of rotation u2014 such as a local ball joint effect u2014 and horizontal linear guiding in the direction of a strip edge the invention can provide that the two axes of rotation 12557 12558 are exactly intersecting which facilitates the double pivoting of the carriage relative to the frame about a single axis but also about two axes simultaneously each guiding track comprises a bottom and two sides said sides are parallel to the axis of rotation of the wheel moved in said guiding track the wheel linked to the axis of rotation consequently has at least part of its circumference in contact with or stopped by one of the sides of the track in particular the second and third wheels 12553 each roll with a small amount of play in a guiding space 12555 where they are free to pivot about the axis 12557 of the first wheel 12554 the first wheel 12554 rolls with a small amount of.