| 摘要 |
PURPOSE:To make it possible to make highly accurate shifting and positioning by making a cam tooth a V-shaped bevel tooth and giving a cam body degree of freedom in vertical and horizontal directions. CONSTITUTION:The cam body 24 forms bevel slopes 30, 32 having bevel angle alphaat the tip in the cam part 25, and cam teeth 31, 33 having the same lead angle theta with the lead 17 of a lead screw 18 are formed on the slope, and cam teeth 31, 33 engage with the lead 17. When vertical deviation is generated to the lead screw 18 within the range of feeding of a carriage 10, the cam part 25 shifts to the state of stable engagement, and consequently, the cam body 24 is titled around a pivot 25. When the cam body 24 is turned around a pivot 50, positional change does not take place as only the convex part 48 of the pin 46 moves on the square hole plane 34.
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