Machine for controlling the shape of a reel of web product

A machine for controlling the shape of a reel of web product, the machine comprising:

• at least one pick-up zone for at least one reel to be evaluated;
• a moving apparatus for moving said at least one reel along a moving path from said pick-up zone toward an unloading zone;
• and
• an evaluation apparatus for evaluating one or more geometric parameters of the reel, said evaluation apparatus being configured to act in at least one evaluation zone provided at least in part along said moving path of the reel, wherein said evaluation apparatus comprises at least one distance measurement sensor, wherein during a relative movement of the reel with respect to the distance measurement sensor, said distance measurement sensor is adapted to read the respective distance from the reel, wherein said evaluation apparatus further comprises a device for detecting the position of the reel, in the direction of relative movement, with respect to said distance sensor, so that for each distance reading carried out by a distance sensor the relative position of the reel in said direction of movement is also known, and therefore the combination of the distance information acquired by the distance measurement sensor from the reel and of the information relating to the position of the reel in the direction of movement allows information on the geometry of the reel to be obtained, wherein said machine comprises a regulation device for regulating the position of said at least one measurement distance sensor in the evaluation zone of the reel, said regulation device comprising at least one regulation direction of the position of the sensor, wherein said position regulation device further comprises a further device for indicating the position of the distance measurement sensor along said regulation direction.