Abstract: A revolving tool carrying turret for lathes and the like machine tools, comprises a fixed base and a movable tool carrying body, effective to be locked to one another by base ring gears, the fixed base being provided with a central upright thereon is coaxially formed a screw rigid therewith, engaging a nut screw effective to revolve and axially move through a predetermined angle, corresponding to the movement required for unlocking or locking the base ring gears. The central upright supports, at the top end thereof, an electric motor therewith is coupled an epicyclical unit having a first end gear wheel rigid with the tool carrying body and a second end gear wheel rigid with the nut screw, between the two end gear wheels being located one or more planet wheels.

Abstract: An automatic turret for a lathe and the like comprises a fixed base, a control screw mounted to be rotatable and axially non-displaceable, a nut connected to a tool-carrying body, two basic toothed crowns and at least one latch for arresting the tool-carrying body.

Abstract: The invention provides automatic positioning of a tool carrier in a turret for machine tools. The turret comprises a support mounted on a base for rotation and against axial displacement and a tool carrier mounted on the support for rotation therewith. The tool carrier has a guide in alignment with an annular track on the base. A pair of coaxial rings of teeth on the base and the tool carrier are arranged for meshing engagement to locate the tool carrier on the base in a working position, and a bolt is glidably mounted in the guide and is displaceable along the track upon rotation of the tool carrier. The track has a plurality of recesseseach adapted to receive a projecting end of the bolt for locking the tool carrier in position.