Turret tool holder

A turret tool rest including:

• an engagement means for positioning the turret at a predetermined angular position in an engaged state of engaging elements on the turret side and the support base side of the turret, and for allowing rotation of the turret in a disengaged state of the both engaging elements;
• a clutch member engageable with a drive section side engaging body of a turret drive section that rotationally drives the turret, for transmitting a driving power to the turret drive section;
• and
• a moving mechanism for moving the engagement element during the movement of the clutch member, in coordination with the clutch member at a lower speed than the moving speed of the clutch member, such that the clutch member and the driving-portion-side engaging body are brought into an engaged state before the engagement elements are disengaged from each other, and the engagement means is switched to a disengaged state after a free rotation of the turret has been restricted, wherein the moving mechanism comprises:
• a rotatably supported drive shaft;
• a first feed screw mechanism and a second feed screw mechanism rotatable corresponding to the rotational drive of the drive shaft, for moving the clutch member and the engagement element;
• and
• a coordination mechanism arranged between the drive shaft and the first feed screw mechanism or the second feed screw mechanism, for moving the engagement element in response to the rotational drive of the drive shaft, with a feed amount smaller than the feed amount of the clutch member.