英语翻译
In our prior British Patent No.588,506 there is described a roller comprising a frame,stub axles supported in the frame from the roller body and a centralling disposed out of balance shaft having an eccentric mass,which shaft is mounted in bearings secured to the roller body and resiliently supported from the frame,so that on rotation of the shaft by an engine carried on the frame,vibrations will be imparted to the roller in its frame.