A loading device adapted to be provided in a machine tool includes a rail portion and a loader configured to travel along the rail portion, wherein the loader includes a pivoting portion and an arm portion extending and contracting with respect to the pivoting portion, and the arm portion includes a hand portion that holds a workpiece.

A machine tool capable of reducing the time required to transfer a workpiece includes a spindle chuck provided to a spindle that rotates about an axis, and capable of holding a workpiece to be worked on, a temporary placement chuck capable of holding a workpiece, a tool post driver to move the temporary placement chuck relatively to a facing position in which the spindle-side workpiece holder and the workpiece holder for temporary placement are able to transfer or receive a workpiece to or from each other, and to a separated position in which the spindle-side workpiece holder and the workpiece holder for temporary placement are able to transfer or receive a workpiece individually, and a loader including a spindle-corresponding workpiece holder and a temporary placement-corresponding workpiece holder disposed to face the spindle chuck and the temporary placement chuck in the separated position, respectively.

A bar material supplying device includes a feed rod having a leading end provided with a finger chuck, a feed rod servomotor and an air cylinder device that move the feed rod in a longitudinal direction to insert and pull the bar material into and from the finger chuck, and an NC device that controls driving of the feed rod servomotor and driving of the air cylinder device. The NC device controls the driving of the feed rod servomotor and the driving of the air cylinder device to move the feed rod in an operation of inserting and pulling the bar material into and from the finger chuck, and operates as an error allowable device that allows an error of an operation amount of the feed rod servomotor motor in the operation of inserting and pulling the bar material into and from the finger chuck.

Bar feeder (1) comprising a guide channel (10) centred on an invariable guide axis (A-A), characterised in that the guide channel (10) is adjustable and is formed by an adjustable guide element which can define a guide channel with a constant centre (C) corresponding to a bar diameter comprised between a maximum bar diameter (DMax) in a first position (P1) and a minimum bar diameter (DMin) in a second position (P2) under the action of a device for adjusting the diameter of the guide channel (2).

A material bar magazine for guiding material bars on an automatic lathe and a system having such a magazine and automatic lathe having at least one headstock that is displaceable along a longitudinal axis of the material bar magazine, where the material bar magazine includes a material bar-guiding channel system having a channel opening system. Further, the channel system of the material bar magazine has a first, outer guide channel and a second, inner guide channel mounted inside the first guide channel such that it can move relative thereto along the longitudinal direction, the second, inner guide channel couplable or coupled to the headstock of the automatic lathe for moving the second, inner guide channel as a result of a change in position of the headstock along a longitudinal axis of the material bar magazine in overrun condition synchronously therewith along the longitudinal axis and relative to the first guide channel.

A quick coupling unit for bar loader clamps includes an end shaft that can be accommodated rotatably within a corresponding seat of a tubular body that is integral with the bar pusher of said loader and an element for stable coupling to the terminal stem of the respective clamp. The element includes a sleeve provided with a recess whose shape and dimensions are complementary to those of an insert which can be accommodated in said recess. The quick coupling unit also includes a locking ring having a variable inside diameter that surmounts said sleeve, the rotation of the ring to a first configuration defines clamping of the insert within the recess and locking of the stem, and to a second configuration defining radial freedom of the insert and free exit of the stem.

A self-centring device for supporting and guiding bars to be fed to a machine tool, including: a guide body having a through opening, supported rotatably and rotating in a controlled manner around an axis perpendicular to an advancement direction of the bars to be guided, so as to vary the angular orientation thereof around the axis; the guide body is configured to receive and maintain in position the rotating and advancing bars, a return member configured to oppose a suitable preselectable resistance to the rotation of the guide body around the axis so as to maintain a firm coupling and contact of the guide body with the advancing bar, a manual selector member configured to adjust a position and control the angular movement of the guide body. The manual selector member includes a screw arrangement cooperating with an oscillation limiting element to set an angular rest position of the guide body in function of the geometry of the bar to be received and guided to said machine tool.

An apparatus for feeding bars to a machine tool includes a rotary drum provided with a plurality of guide units distributed circumferentially and extending parallel to a longitudinal axis, each guide unit having two parts that are reciprocally movable and openable, by a respective lever to receive a respective bar to be advanced to the machine tool. An actuator element is provided and configured to act directly on a specific lever to open the corresponding guide unit. A support assembly is provided for receiving and supporting a plurality of bars in a position adjacent to the drum. A loading unit includes a lifting device that is movable from a lower position to an upper position to pick up one or more bars from the support assembly and lift the bars to the upper position. The loading unit further includes a selector unit for selecting a single bar at a time when the lifting device is in the upper position to transfer the bar to a respective guide unit.

Method of producing a body (1) for bar feeders, wherein it comprises a first molding step (A) carried out with the aid of a first molding material (M1) in a mold (20) jointly with an overmolding step (B) of a countermold (50), the shape of the mold (20) and/or the shape impressions of the countermold being conceived to achieve in an integral way at least one structural and/or functional element of the said bar feeder.

An apparatus includes a self-centring device for centring and guiding a bar, tube or the like to be advanced to a spindle of a machine tool, includes a hollow containing body with through opening having a longitudinal axis, for receiving a bar to be fed along an advancement direction to the spindle; in the body an inner sliding surface is defined that is tilted with respect to the longitudinal axis; centring and guiding elements are provided housed in the hollow body and shaped for coming into contact with the bar and exert thereupon a distributed centring and guiding action; the centring and guiding elements that are slidable along the inner surface for the distance thereof from the longitudinal axis to adapt to different bar diameters; in the body an elastic member is housed to urge the centring and guiding elements to the position of minimal reciprocal distance so as to induce and maintain, during operation, the centring and guiding elements in contact with the surface of the bar. An advancement device is further disclosed for the bar, having a supporting and guiding member configured for restingly receiving, from a first side, a bar and configured for guiding said bar along an advancement direction, a movable grasping member mobile from a disengaged position, further from the member to be separated from the bar, to a locking position, nearer said supporting member to press longitudinally the bar from a second opposite side against the supporting member; advancement motor device is configured for rotating the supporting and guiding member and/or the movable grasping member in the locking position to draggingly advance the bar along the advancement direction.