Patent ID: 7234244

Claim:
A method for determining a position of an end head used in rolls of packing paper, cellulose, or board relative to a grab transporting the end head, when the end head is attached to the grab, comprising: transporting a detector along a circular curve assumed to be intersected by a circular curve defined by an edge of an end head; measuring an angle position of the detector on the circular curve of its transport path; detecting intersection points between the circular curve traveled by the detector and the edge of the end head; calculating a position of a center point of the end head on the basis of: a) a radius of the circular curve traveled by the detector and the position of the center point of the circular curve traveled by the detector, b) a position of a tool point of the grab, c) an assumed radius of the end head, and d) positions of the detected intersection points; and calculating a position of the center point of the end head in the set of coordinates of the grab.