| 主权项 |
1. A moving mechanism comprising:
a drive shaft rotatable about an axis; and a traction nut configured to hold the drive shaft therein and extending in a direction orthogonal to the axis of the drive shaft, wherein the traction nut is configured to switch between a friction-contact state of being in friction-contact with the drive shaft and a disengaged state of being disengaged from the drive shaft, the traction nut comprising:
twist rollers pivotally supported so as to be rotatable in a state of defining an inclination angle with respect to the axis of the drive shaft, the inclination angle being equivalent to a lead angle,an open/close lever configured to switch between the friction-contact state and the disengaged state of the traction nut, anda biasing tool configured to generate a biasing force such that the traction nut is brought into friction-contact with the drive shaft, wherein:
when the drive shaft is rotated in a state where the traction nut is in friction-contact with the drive shaft, the traction nut precisely moves along the drive shaft depending on the lead angle,in a state where the traction nut is disengaged from the drive shaft, the traction nut freely and roughly moves along the drive shaft, the rough movement being less precise than the precise movement,the open/close lever is configured to place the traction nut in the disengaged state against the biasing force of the biasing tool, in response to user operation, andthe traction nut returns to the friction-contact state due to the biasing force of the biasing tool, when the user releases the open/close lever. |
