Rotating shaft of roller screw structure and its driven device

A drive transmitting apparatus comprising:

• (a) a roller screw member including a rotatable central shaft, a plurality of support shafts projecting radially outwardly from said central shaft, said support shafts being arranged at equally spaced intervals along a helical line around said central shaft, a plurality of rollers rotatably mounted on said support shafts, said rollers including bearing means for mounting said rollers on said support shafts, and annular elastic means arranged around at least one end of said support shafts for correcting any error in the positioning of the axes of said shafts and respective rollers relative to said central shaft;
• and
• (b) a rail member arranged adjacent said roller screw member and parallel with the axis of said central shaft, said rail member including a plurality of equally spaced projections having inclined upper surfaces adapted for engagement with the surfaces of said rollers, the inclination of said projection surfaces being equal to that of the helical line of support shafts on said roller screw member;
• (c) one of said roller screw and rail members being adapted for axial movement and the other of said roller screw and rail members being fixed against axial movement, whereby when said central shaft is rotated, said roller surfaces roatatably engage said projection surfaces and said movable member is moved in the axial direction.