Abstract: A disclosed example tool changer for changing a tool on a spindle of a machine tool comprises a tool drum having a plurality of tool holders to hold tools. The example tool changer also includes an axle carrier on which the tool drum is rotatably supported to align the tool holders with the spindle. A first coupling portion is rotatably supported on the axle carrier. At least one first gear stage is provided via which the first coupling portion is connected to the tool drum. The first coupling portion is adapted to be coupled or uncoupled with a second coupling portion rotatably supported on a spindle stock of the machine tool and connected to the spindle of the machine tool via at least one second gear stage. The tool drum is adapted to be driven, when the first and second coupling portions are in a coupled state, by the spindle of the machine tool via the at least one second gear stage, the second and first coupling portions and the at least one first gear stage to align the tool holders.

Abstract: Disclosed examples relate to loading devices for loading bars for machining in machine tools. A disclosed example loading device is adapted to move a bar from a starting position to an end position and to feed the bar from the end position to the machine tool, comprising a rest portion for supplying the loading device with at least one bar lying on the rest portion in the starting position, and a movable transport for transporting the bar from the starting position to the end position. The transport is adapted to transport the bar downward in a downward movement due to its gravity along a downwardly inclined guiding portion, the bar being supported by a first support portion of the transport.

Abstract: A securing device for a workpiece spindle of a lathe includes a spindle housing having a plane surface and rotatably supporting a workpiece spindle, a brake disk non-rotatably connectable with the workpiece spindle, a clamping device for fixing the brake disk and mounted on the spindle housing, the brake disk being formed as a disk which is rigid in a circumferential direction and is bending-resistant in a direction of a spindle axis, the disk being pressable by the clamping device against the plane surface of the spindle housing.

Abstract: A process for determining the presence or the dimensions or the correct positioning of a tool which is clamped in the main clamping device of a numerically controlled machine tool opposite which a displaceable component of the machine is arranged, wherein for a displacement of the component towards the workpiece an intended position value is predetermined and the actual position value of the component is continuously determined repetitively, is further developed so that this can be done more simply.

Abstract: A drive for workpiece spindle of a machine tool comprises a drive motor to be arranged on the free end of a workpiece spindle, a motor housing, a rotor to be mounted on the workpiece spindle and a stator arranged in the motor housing. The motor housing is connectable with a spindle box and has a motor cover. Cooling medium passages extend between the motor housing and the motor cover, between the rotor and the workpiece spindle and between the spindle box and the rotor.

Abstract: In a machine tool with an inclined machine bed in which two independently movable cross slides are provided, which carry turret heads with tool receivers automatically interchangeable tool grippers are adapted to bring the tools in predetermined positions into respective tool receivers.

Abstract: An indexable revolving turret has a rotary tool carrier which is movable to a plurality of angularly spaced indexed positions, and an indexing shaft which is connected with the tool carrier for indexing the same to the respective ones of these positions. Cooperating spur gears are provided on the tool carrier and on the housing and become disengaged preliminarily to indexing of the tool carrier. A control shaft is driven by a drive so as to be rotated by the same and transmits motion to a Maltese-cross drive, an input member of which is mounted on and rotatable with the control shaft. The indexing shaft can be moved axially of itself, thereby moving the tool carrier into and out of indexing position, and for this purpose a cam drum is mounted on the control shaft and the cam follower slides in a cam groove of the cam drum and is connected with the indexing shaft so as to move the same into and out of an indexing position, depending upon the angular position of the cam drum.

Abstract: A multi-station machine tool wherein the bed of the frame supports two spaced-apart upright columns and the columns support an indexible shaft for a turret which is disposed between the columns. The turret has several sets of clamping jaws for elongated rod-shaped workpieces which are introduced and removed at a first station or which are introduced at a first station and removed at a second station. The number of stations may greatly exceed two, and each column supports several spindles including at least one rotary and axially movable tool spindle and at least one axially movable and preferably rotary work spindle. Each spindle in one of the carriers is coaxial with a spindle in the other carrier, and the turret indexes the workpieces in such a way that they come to rest between successive or selected pairs of coaxial spindles.

Abstract: A machine tool wherein the carrier for several rotary work spindles is separably mounted on a base in such a way that the chucks of two spindles are spaced apart by equal distances from horizontal ways for two side slides each of which mounts a carriage for an indexible tool turret. If the treatment of a workpiece at one of the working stations takes up more time than the treatment of a workpiece at the other working station, the tools which have completed the treatment of a workpiece at the other station are moved to the one station to cooperate with the other tools in rapidly completing the treatment of the workpiece at the one station. The carrier may be a box-like structure with two spindles or a drum having more than two work spindles and being indexible in a headstock, which is separably secured to the base.

Abstract: A mechanism for moving a cross slide in a multiple-spindle automatic machine has a rotary face cam which is driven by a gear and is angularly adjustable with respect to the gear, a first lever which is pivotable on a first shaft parallel to the axis of the cam and which has a first arm carrying a roller follower for the cam and a second arm having a slot for a sliding block which is mounted on a pin-shaped carrier. The carrier extends through one or more slots of a second lever which is rigid with a second shaft, and the carrier can be fixed to the second shaft in a selected position by means of washers and nuts. The second shaft is rigid with a gear segment which meshes with a toothed rack affixed to and adjustable lengthwise of the slide. The first lever may be a bell crank lever or a straight two-armed lever, and the second lever may have a single arm with a single slot for the carrier of the sliding block or a bifurcated arm with two aligned slots for the carrier.

Abstract: A turret head for a rotary turning machine having a base rotatably mounted on a cross-slide for movement about a first axis. The turret head is mounted to the base for rotatable movement relative thereto about a second axis that is inclined to the first axis by an angle .alpha.. The turret head includes two rings or annular arrays of tool holders. Each ring has its tools disposed so that their axes lie on the surface of an imaginary cone having a vertex angle of 2.beta., such that .alpha. + .beta. = 90.degree.. The two imaginary cones have their axes coincide with the second axis and preferably the vertices of the cones coincide, so that the cones are mirror images of each other.