US Patent 4,262,706 (granted 21 April 1981) to Karl Popp and Heinz Schaub, assigned to Sulzer Brothers Limited of Winterthur, Switzerland. It describes a loom whose tension (whip) roll has bearings that move independently, so the roll can tilt when warp tension differs between the two partial warp beams. Position sensors such as potentiometers detect the tilt and signal separate drive motors to adjust each warp beam's let-off. The scan holds the patent's abstract, claims, description, and two sheets of drawings, including prior-art figures for comparison.