Support mechanism

A support mechanism, comprising:

• a fixed body member;
• a rotating unit, mounted to the fixed body member, used for rotating with respect to the fixed body member;
• a moving unit, disposed at the fixed body member, including a ball screw spline shaft, a ball screw nut and a ball spline nut, the ball screw nut being rotatably disposed at the ball screw spline shaft, the ball spline nut being rotatably disposed also at the ball screw spline shaft, the ball screw spline shaft being moved together with the rotating unit;
• and
• a driving unit, disposed at the fixed body member, including a first driving member and a second driving member, the first driving member being to rotate the ball screw nut, the second driving member being to rotate the ball spline nut;
• wherein, with different rotation pairs of the ball screw nut and the ball spline nut to the ball screw spline shaft, the ball screw spline shaft is driven to correspondingly move, and the ball screw spline shaft is further driven to move the rotating unit;
• wherein the fixed body member includes a first bevel gear, and the rotating unit includes a second bevel gear;
• wherein, when the rotating unit rotates axially about the ball screw spline shaft, a rotation angle of the rotating unit with respect to the fixed body member is adjusted through meshing between the first bevel gear and the second bevel gear.