Patent ID: 7470095

Claim:
Rotary head for a milling machine spindle, comprising a fork ( 18 ), mounted for rotation around a first axis (C) and having two fork arms ( 21 , 22 ), a spindle device ( 23 ), mounted between said fork arms ( 21 , 22 ) around a second axis (A), for rotation and rotatable relative to said fork ( 18 ), a first drive device ( 32 ), comprising a first torque motor ( 42 ), coupled to said fork ( 18 ) for directly driving and controlling of the rotation of the fork ( 18 ) around the first axis (C), and a second drive device ( 33 ), mounted in said fork ( 18 ) and having a second torque motor ( 57 ) for driving and controlling the rotation of the spindle device ( 23 ) around the second axis (A) and a reduction gear device ( 61 ), positioned between said torque motor ( 57 ) and the spindle device ( 23 ) for transmitting the rotational motion of the second torque motor ( 57 ) to the spindle device ( 23 ) to thereby increase the torque delivered by the second torque motor ( 57 ) to torque values required for the spindle device ( 23 ), said second drive device being completely positioned within one of said fork arms.