| 摘要 |
PROBLEM TO BE SOLVED: To provide a rotary driving device for switching the rotating speed of a tool holder. SOLUTION: This rotary driving device is provided with an output drive shaft 10 for supporting the tool holder 17, and the output drive shaft 10 is enabled to move in the first and second axial directions depending on the preset drive. The output drive shaft 10 is connected to a power drive type first drive gear wheel 14 in the first axial position, and connected to a co-axial tubular shaft in the second axial position. The coaxial tubular shaft is driven through a worm drive 32 by a power drive type second drive gear wheel 15. |
