Abstract: Lathe with a workpiece spindle (28) defining a Z-axis as well as a tool carrier slide (56) bearing a tool carrier in the form of a tool turret (112) having a turret body and a turret head, the slide being displaceable in the direction of a first axis (X-axis) extending transversely to the Z-axis, whereby workpiece spindle and tool carrier slide are displaceable relative to one another in the direction of the Z-axis, the tool turret is pivotable about a second axis (Y-axis) likewise extending transversely to the Z-axis as well as transversely to the X-axis and the turret head is mounted on the turret body so as to be rotatable about an indexing axis extending transversely to the Y-axis, and with first tool receiving means on the turret head (114) as well as a second tool receiving means (142) mounted on the turret body (110).

Abstract: An automatic lathe having two workpiece spindles each provided with a workpiece clamping device and arranged with coaxial spindle axes. At least one of the workpiece spindles is arranged on a slide guided for displacement in the direction of the spindle axis and displaceable in the direction of the spindle axis by a drive element and a coupling device between the drive element and the slide. In order to compensate for axial movement component of the clamping device during clamping, the coupling device is designed such that in a first condition thereof, the slide is freely displaceable relative to the drive element in the direction of the spindle axis and opposite to the axial movement component of the clamping device. In a second condition of the coupling device, the slide is not displaceable relative to the drive element in the direction of the spindle axis.

Abstract: In order to so improve a bar stock feeding means for machine tools comprising a longitudinal guide means on which several holders which each receive the bar stock in a guide means are held for movement in the longitudinal direction of the longitudinal guide means, and a drive means with which the holders are displaceable from an initial position in which they exhibit a maximum spacing from one another in the longitudinal direction into an end position on the machine tool side in which they exhibit a minimum spacing from one another in the longitudinal direction, that it can be sturdily and structurally simply made, it is proposed that the longitudinal guide means comprise a guide element having a longitudinal thread, that the holders be held in parallel alignment with one another by threaded rings engaging the longitudinal thread, and that the holders be movable in the longitudinal direction between the initial position and the end position by a relatively rotation between the guide element and the threaded r

Abstract: In order to improve a multiple-spindle automatic lathe comprising a working area, a spindle drum having several spindles in different spindle positions, the spindles being adapted to be brought into different spindle stations on a machine frame by rotation of the spindle drum about a spindle drum axis, a bar stock feed means associated with at least one spindle, and a stop arranged in the working area and having a stop surface for bar stock, such that the stop can be arranged so as to save more space, it is proposed that the stop be mounted for rotation concentrically with the spindle drum axis, and that the stop be fixable relative to the spindle drum during bar stock feed in an initial position in which the stop surface intersects a feed direction of the bar stock located in the spindle position associated with this initial position.

Abstract: In a method and a multiple-spindle automatic lathe for machining both sides of workpieces, in order to increase the number of spindle positions available for machining the workpieces, it is suggested that the spindle drum be indexed in single steps, that the feeding of raw workpieces, the removal of finished workpieces and the changeover of half-finished workpieces be carried out in a single spindle position of the spindle drum and that the feeding of raw workpieces and the removal of finished workpieces occur alternately after each drum indexing.

Abstract: In order to improve a machine tool with a motor spindle, including a main motor integrated into a work spindle coaxially with the spindle axis, the main motor, for its part, comprising a rotor and a stator, and with a cooling device for supplying cooling surfaces of the main motor with a gaseous coolant, so that simple and effective cooling of the main motors of the motor spindles is possible, it is proposed that the stator be comprised of stator plates which, for their part, form cooling surfaces, and that the gaseous coolant be conducted directly along the cooling surfaces of the stator plates.

Abstract: In order to improve a machine tool comprising at least one hydraulic drive for working motion or rapid motion operation connected via a supply pipe to a high-pressure network supplied by a high-pressure pump so that the drives can be operated with high pressure for working motion and to a substantial degree with low pressure for rapid motion, it is proposed that a low-pressure network supplied by a low-pressure pump be provided for operating the drive for rapid motion, that a flow-limiting member be arranged between the high-pressure network and the supply pipe for bringing about a pressure drop in the supply pipe during the rapid motion by limiting the flow of a hydraulic medium under high pressure and for maintaining the high pressure to a substantial degree during the working motion, and that the low-pressure network be connected to the supply pipe via a check valve which is open on account of the pressure drop during the rapid motion and closed during the working motion.

Abstract: In a method and a multiple-spindle automatic lathe for machining both sides of workpieces, in order to increase the number of spindle positions available for machining the workpieces, it is suggested that the spindle drum be indexed in single steps, that the feeding of raw workpieces, the removal of finished workpieces and the changeover of half-finished workpieces be carried out in a single spindle position of the spindle drum and that the feeding of raw workpieces and the removal of finished workpieces occur alternately after each drum indexing.

Abstract: A workpiece handling device comprising a carrier mounting a plurality of pivot levers, each of which holds a clamping element. The pivot levers are pivotable about axes extending parallel to one another and their clamping elements are adapted to be synchronously moved towards and away from one another by a drive means common to all the pivot levers. In order to be able to move the clamping elements exactly in radial directions and in straight lines relative to the center of the workpiece and, at the same time, covering a large circular area, it is suggested that a clamping lever bearing the clamping element be articulatedly mounted on each pivot lever pivotable by the common drive means and that a pivoting device engaging each clamping lever be provided for pivoting the clamping lever in relation to the pivot lever in response to the pivoting movement thereof such that the clamping elements move in a manner known per se along straight lines intersecting at a center.

Abstract: Multiple-spindle lathe with a drive shaft which is rotatably and longitudinally displaceably mounted in a headstock, a spindle carrier which is mounted on the headstock for rotation about an indexing axis, and several work spindles which are rotatably mounted in the spindle carrier and comprise at their outer ends chucks and at their inner ends coupling elements for coupling one respective work spindle with the drive shaft.

Abstract: The invention relates to a feeding device for a tool slide of a machine tool of a simple, compact and economical construction comprising an electro-hydraulic linear amplifier easily accommodated in the constructional space of a hydraulically operated tool slide. The valve housing is inserted into the piston rod on the side of the piston remote from the control valve means thereby allowing for a plurality of tool slides to be arranged in a very compact space. The valve means forms a cartridge which can be simply inserted into the cylinder chamber formed by the cylinder housing. The arrangement of the control valve means in the cylinder housing and the rigid connection between the motor and the piston result in compact design and in shorter conduits for the hydraulic fluid between the control valve means and the cylinder chambers thereby leading to a high rigidity of the feeding device.

Abstract: A method of machining a workpiece, which is rotatable about a first axis, by a tool pivotable about a second axis parallel to the first axis and drivable about a third axis perpendicular to the second axis. To allow the circumference of the workpiece to be machined off-center without the necessity of moving the first or the second axis transversely to the plane defined by these two axes, the workpiece and the tool are rotated or pivoted about the first or second axis, respectively, at the same time, in the same direction and at the same angular velocity and, simultaneously the second axis is displaced transversely to the first axis at such a velocity that the equation X.sup.2 =Y.sup.2 +A.sup.2 always applies, wherein X is the distance of the second axis from the first axis, Y is the distance of the first axis from the plane defined by the second and third axes and A is the distance of the second axis from the vertical projection of the first axis onto this plane.

Abstract: A tool carrier for lathes, in particular a tool turret, having a plurality of stations for holding tools, at least one of which is provided with a driven tool spindle designed as a hollow shaft and rotatably mounted in a housing. This tool spindle accommodates a tool chuck which is coaxial to and non-rotatably connected with the tool spindle and is displaceable in axial direction relative to the tool spindle for opening and closing. The tool carrier also has a threaded spindle connected in axial direction with the chuck and a nut arranged thereon for opening and closing the chuck. To simplify the construction only one drive shaft is provided and this shaft is constantly coupled with the nut and connected with the tool spindle via a releasable coupling.

Abstract: Device for changing the attachment jaws of a chuck provided with main jaws, each of which has two axially aligned bolts for exact positioning of the attachment jaws. These bolts engage and fit into bores in the attachment jaw and guide a locking slide means which is displaceable in a radial direction by means of a headless screw inserted into the attachment jaw. A gripping device for the atachment jaws has a screw driving means and a threaded bore for the screw and so the latter is screwed partially out of the attachment jaw and into the gripping device in order to connect gripping device and attachment jaw with one another.

Abstract: The invention relates to a chuck in which the clamping jaws are connected with the chuck body via radially deflectable arms. Two flat parallel arms are preferably provided for each clamping jaw. These arms act like leaf springs and form a parallelogram link arrangement for the associated clamping jaw. The clamping jaws and arms are preferably designed in one piece with the chuck body by forming slots in corresponding projections of the chuck body by means of wire erosion. The clamping jaws are actuated in accordance with the invention via a wedge face arrangement comprising a two-armed lever for each clamping jaw. A short arm of the lever engages the associated clamping jaw whereas a wedge face provided on a distinctly longer arm of the lever interacts with an actuating element, in particular a roller, of the axially displaceable actuating member.

Abstract: The invention relates to a multiple-spindle automatic lathe with several work spindles. In accordance with the invention, each of the work spindles comprises an associated electric motor. Associated with the electric motors are supply devices with at least one stationary means fed from an external voltage source and at least one rotatable means cooperating therewith. Also provided are speed and position control devices comprising per work spindle one rotary angular position detector means each for absolute value angle coding including a detector rotating synchronously with the work spindle and a stationary sensor means.

Abstract: A method of machining a workpiece, which is rotatable about a first axis, by a tool pivotable about a second axis parallel to the first axis and drivable about a third axis perpendicular to the second axis. To allow the circumference of the workpiece to be machined off-center without the necessity of moving the first or the second axis transversely to the plane defined by these two axes, the workpiece and the tool are rotated or pivoted about the first or second axis, respectively, at the same time, in the same direction and at the same angular velocity and, simultaneously, the second axis is displaced transversely to the first axis at such a velocity that the equation X.sup.2 =Y.sup.2 +A.sup.2 always applies, wherein X is the distance of the second axis from the first axis, Y is the distance of the first axis from the plane defined by the second and third axes and A is the distance of the second axis from the vertical projection of the first axis onto this plane.

Abstract: Automatic turret lathe with a synchronous spindle in the tool turret which is drivable in synchronism with the main spindle and comprises a workpiece chuck means. To enable workpieces to also be worked on the rear side, i.e., on the side on which they were severed from a stock rod, while the next workpiece held in the main spindle is already being machined with the aid of a further tool carrier, a third tool carrier is arranged on the side of the tool turret mounted on a compound slide system facing away from the main spindle.

Abstract: A method of machining a workpiece, which is rotatable about a first axis, by a tool pivotable about a second axis parallel to the first axis and drivable about a third axis perpendicular to the second axis. To allow the circumference of the workpiece to be machined off-center without the necessity of moving the first or the second axis transversely to the plane defined by these two axes, the workpiece and the tool are rotated or pivoted about the first .[.or.]. .Iadd.and .Iaddend.second .[.axis.]. .Iadd.axes.Iaddend., respectively, at the same time, in the same direction and at the same angular velocity and, simultaneously, the second axis is displaced transversely to the first axis at such a velocity that the equation X.sup.2 =Y.sup.2 +A.sup.

Abstract: .[.A method of.]. .Iadd.Apparatus for .Iaddend.machining a workpiece, which is rotatable about a first axis, by a tool pivotable about a second axis parallel to the first axis and drivable about a third axis perpendicular to the second axis. To allow the circumference of the workpiece to be machined off-center without the necessity of moving the first or the second axis transversely to the plane defined by these two axes, the workpiece and the tool are rotated or pivoted about the first .[.or.]. .Iadd.and .Iaddend.second .[.axis.]. .Iadd.axes.Iaddend., respectively, at the same time, in the same direction and at the same angular velocity and, simultaneously the second axis is displaced transversely to the first axis at such a velocity that the equation X.sup.2 =Y.sup.2 +A.sup.