Patent ID: 8305588

Claim:
A position-measuring method for positioning a wheel in a mash seam resistance welding process for butt-joining steel strips on a continuous processing line, the method which comprises: a) positioning a rotary roller which is fastened to a movable frame in a measuring position vertically below a reference wheel; b) continuously lowering the reference wheel in a vertical direction so that a lower surface thereof comes into contact with the rotary roller and produces a bearing force on the roller; c) continuously moving the roller in the vertical direction; d) repeatedly measuring a distance between an index that is secured to a measuring arm of the movable frame and an articulated post fixed to the movable frame during the continuous movement; e) comparing the distance with a distance threshold for each of the repeated measurements until the reference wheel reaches a first operating position in which the distance is equal to a predefined factor of the distance threshold; and f) recording the first operating position as a reference point in a system for the vertical movement of the reference wheel.