thereof from the axis of rotation of the driving member 60 in the direction away from said axis when the roller 70 moves along the section of the wavy surface having the profile of its section with a variable angle of ascent the value of the translational component of motion of the intermediate member is decreasing to zero and then increases up to the value possessed by the translational component at the end of the preceding period but in the direction towards the axis of rotation of the driving member when said roller moves along the section of the wavy surface having the profile of its section with a constant angle of ascent in this case it may be called the angle of descent the value of the translational component is proportional to the distance of the intermediate member away from the axis of rotation of the driving member and is directed towards said axis lastly when the roller moves along the wavy surface having the profile of its section with a variable angle of ascent the value of the translational component of motion of the intermediate member in the direction towards the axis of rotation of the driving member decreases to zero and then increases to the value possessed by.