| 摘要 |
PURPOSE:To achieve a linear motion of a main shaft only in a motor itself without necessity of any member in the shaft for a stator by engaging a main shaft antirotation cap within a notch for anti-rotation of the main shaft. CONSTITUTION:Since the feed threads 4a of a main shaft 4 are engaged with female threads 2a of a bearing sleeve 2, the rotary motion of a rotor 1 is converted into a linear motion of the main shaft 4. However, when the shaft 4 is rotated for a stator 5, i.e., when the rotor 1 and the shaft 4 rotates integral ly, this conversion does not occur. Thus, the shaft 4 is disabled to rotate by a cap 13 for an anti-rotation of the main shaft secured to a rearing retaining member 8, i.e., the stator 3 and a D-cut notch 4b formed on the shaft 4, and converted to the rotary motion of the rotor 1 by a sole motor without using an external main shaft anti-rotation member. |
