FELLA has been designing implements for tractors for more than 90 years. These include mowers, hay rakes and swathers. The swather works by using eight, ten or twelve tine arms to rake together stalk material that has already been mown or spread out to form a swathe. All swathers made by this supplier work exclusively using rotary technology, i.e. exploit the benefit of high area performance. "The bearings for the prongs are a part of the complex control system the most important function of the machine," clarifies the design manager. "If these get damaged, the rotary rake stops working. And this must not happen at any time during the harvest. Even at the test stage we recognised that we needed an anti-rotation feature," recalls designer Dipl. Ing. (FH) Jürgen Riedel.