Abstract: A rotatable tool-holder turret for lathes, work-centers and the like, comprises a stationary base body with a cavity which extends along a longitudinal axis, a tool-holder table rotatable relative to the stationary base body, an element with teeth for locking and releasing the rotatable table relative to the stationary body, a drive mechanism for moving the table between working positions spaced angularly around the longitudinal axis, as well as a compressed air operated cylinder-piston for moving the locking and release element axially. The turret includes a mechanism for amplifying the axial thrust generated by preloaded springs, the mechanism holding the locking element mechanically in the position in which the turret is locked, by a plurality of balls which are movable radially relative to the longitudinal axis of the turret and which can be inserted between and released from facing walls, including at least one conical wall of the locking element and of a wall of a second, stationary tubular element.

Abstract: A tool-carrier turret having a high displacement speed, particularly for lathes and work centres the rotatable table of which is provided with a plurality of supports for fixed tools and a plurality of supports for tools of the rotating type. The turret is provided with a single motor for driving the rotating tools and for displacement of the table through respective mechanical transmissions, as well as a device for commuting the drive from the electric motor to one or other of the mechanical transmissions in synchronism with the device for locking and releasing the table. An encoder is connected to the drive shaft of the rotatable table via a mechanical coupling which makes it possible to obtain a complete rotation of the encoder shaft for each angular displacement of the table between two successive tools.