Abstract: A machining unit having a rotary head that bears pivoting tools for machining a non-rotating part centered on a rotational axis of the head. The supports for the pivoting tools are mounted in the head to pivot about respective axes that are parallel to the rotational axis. Each support has a transversely arranged control lever. A control bushing is mounted coaxially on the machining unit and is arranged to slide axially and adopt a first, advanced position or a second, retracted position. At one end of the control bushing bearing is arranged an ellipsoidal control surface so as to cooperate with helical directing surfaces that are connected to the tools in order to execute a plunging movement of the tools. There is provided a phase-offset device, which is arranged to move the control bushing into two, three or four different predetermined angular positions around its axis.

Abstract: The machining unit is composed mainly of three essential elements which are the rotor, the phase displacement device and the tool drive mechanism. The rotor (100) includes a rotating shaft (1) and is equipped, for example, with four bores, extending parallel to the axis of rotation, into which the cutter carrier axles (9a, 9b, 9c and 9d) are supported. A plunge of the cutters into the material to be machined is controlled by the movement of a command sleeve (19) supporting, at its end, two surfaces (20a and 20b) of ellipsoidal form located to move, in conjunction with the inclined surfaces (14a, 14b, 14c and 14d), the command levers of the tool carrier. The command sleeve can occupy two extreme positions and one intermediary position. A phase displacement device includes a pulley (22) and a reverse pulley (25) mounted rotatably on a shaft (31) to allow angular phase change of the command sleeve (19) with respect to the spindle.

Abstract: A metal-working machine (10) comprises a first machining unit including a machining head (12) and means (11) in the form of a clamp for bringing, holding and axially displacing the material to be machine. The machining head (12) carries tools (13 and 14) which rotate and move relative to two axes X.sub.1 and X.sub.2 perpendicular to the axis (15) of the material. The machine also comprises a main turret (16) equipped with machining stations (17) and stations for receiving (18) the parts. In a first option, it comprises a second machining unit (2) carrying machining stations (23). In a second option, it comprises a third machining unit (24) carrying a machining station (26) equipped with a possibly rotating tool (25). In a third option, the machine is completed by an auxiliary turret (20) carrying a machining station (21).

Abstract: A machining unit, in particular in a numerically controlled lathe, has a rotary head equipped with four pivoting tools for machining parts which pass axially through this head without rotating. Each tool is mounted on a respective pivoting support (6a-6d) provided with a helicoidal guiding surface (26a-26d) the axis of which coincides with the pivoting axis (7a-7d) of the support. The four tools are controlled by means of two concentric annular sockets (30, 42) controlled in translation. The inner socket (30) has two outer surfaces which rest against the guiding surfaces (26a, 26b) of two of the supports. The guiding surfaces are helixes of opposite pitch, and therefore one of the corresponding tools moves toward the part as the second tool moves away from it. The outer socket (42) controls the other two tools in the same manner.

Abstract: A device for straightening a rigid wire delivered in coil form for supplying a metal-working machine is compact and easy to control. The wire is stationary in an axial conduit of a rotor supported on a carriage (B) which is moved axially by means of a first hydraulic jack (13). The rotor carries the wire by stationary guides and a central guide which is moved radially (C) between a centered position and an excentric position by means of a second hydraulic jack (62) while the rotor rotates and the carriage advances. The hydraulic fluid collected at the output (71) of the first jack is transmitted directly to an input (66 or 67) of the second jack (62) so as to actuate it at a speed proportional to that of the first.

Abstract: A machine for successively grinding and polishing tools such as gravers of hard metal has grinding and polishing wheels mounted in parallel shafts on a support which can be moved to bring either wheel to face a tool held in a workpiece holder. The polishing wheel can be moved to an extreme position which is precisely set by a micrometer screw so that it comes to occupy exactly the same position formerly occupied by the grinding wheel. Alternatively, the workpiece-carrier can be moved by a cam system to exactly position the tool against the two wheels.