| 摘要 |
PURPOSE:To improve efficiency by a method wherein the tip end surface of a driving member is formed along the circumference of a rotary drum with a required space while a plurality of driving blocks is arranged so as to obtain a necessary torque by impressing a pulse type voltage on respective piezo-electric elements. CONSTITUTION:The tip end surface 6a of a driving member 6 is formed along the circumference 1a of a rotary drum 1 with a required gap delta while a plurality of driving blocks (A underbar) is arranged on the circumference 1a of the rotary drum 1. Further, the driving blocks (A underbar) are fixed to a supporting body (q) and a pulse type voltage E is impressed on respective piezo-electric elements 3, 3' to obtain a necessary torque. According to this method, slip frictional motion, caused by the difference of radii due to the width of driving friction surface, may be eliminated and a driving efficiency may be improved. |
