| 摘要 |
PROBLEM TO BE SOLVED: To provide a feeding mechanism capable of switching between coarse motion and micromotion and having excellent operability.SOLUTION: A traction nut part includes a twist roller rotatably journaled thereto at a gradient angle equivalent to a lead angle with respect to an axis line of a drive shaft. The traction nut part includes an opening/closing lever for switching the traction nut part between a frictional contact state and a separation state with respect to the drive shaft. Further, the traction nut part includes a spring that generates energizing force such that the traction nut part comes into fractional contact with the drive shaft. The opening/closing lever makes the traction nut part separate therefrom against the energizing force of the spring, by a user's operation and, when the user releases the opening/closing lever, the traction nut part returns to the frictional contact state by the energizing force of the spring. |
