Arrangement for controlling the rolling of a cylindrical object

Apparatus for controlling rolling motion of a cylindrical object, comprising:

• a fixed plane having an upper surface and an underside and formed with guides that are spaced apart along a direction of rolling motion of the cylindrical object and provide a path from the upper surface of the plane to the underside of the plane,
• an elongate pressure element having first and second opposite ends separated by a medial segment, the medial segment of the pressure element being located on the upper surface of the fixed plane and the first and second ends of the pressure element being guided to the underside of the plane via the first and second guides respectively,
• a control means having first and second connections, the control means being operable selectively for providing a pressure medium under pressure discharging the pressure medium to a lower pressure, and
• a connection means for connecting one of the first and second connections of the control means to the first end of the elongate pressure element and for connecting the other of the first and second connections to the second end of the elongate pressure element, for selectively filling the pressure element with a pressure medium through at least one of the first and second ends and for draining the pressure medium from the pressure element through at least one of the first and second ends.