Abstract: A compound turret for machine tools such as latches or the like having rotating and non-rotating tooling turrets mounted on a single housing. The compound turret includes a primary drive and a secondary drive. The primary drive includes a compound turret indexing unit operable to index the rotating and non-rotating tooling turrets into the turret operating and turret storage positions. The compound turret indexing unit consists of a harmonic drive that enables the operator to incrementally vary the turret operating position. The harmonic drive achieves high reduction ratios in a single stage thus eliminating the cumbersome gear systems usually implemented to achieve the reduction ratios required. The primary drive further includes a non-rotating tool indexing unit. The non-rotating tool indexing unit is operable to index the non-rotating tooling. The non-rotating tool indexing unit consists of a harmonic drive unit similar to the compound turret indexing unit.

Abstract: A robotic positioning device has a support structure and a tool implement holding member which is positional within the three dimensional space of the support structure. The tool implement holding member is connected to the support structure utilizing five positioning members. Each of these positioning members is connected to the tool implement holding member. Three of the positioning members are connected to the holding member at a first common center of rotation and the other two positioning members are connected to the holding member at a second common center of rotation. Each of the positioning members is attached to the support structure utilizing a connecting member which allows for the positioning member to freely pivot with respect to the support structure and additionally allows the member to move with respect to the support structure axially along an axis of the member. This is accomplished by moving the members axially toward or away from the support structure.

Abstract: A tire manufacturing unit having two tire building drums mounted on respective coaxial and independent half shafts butt connected in a rotary manner so as to define a single continuous shaft supported in a rotary manner on a platform mounted for rotation in successive 180.degree. steps about a horizontal axis; each half shaft having a respective independent driving device, and one of the drums moving, during each rotation step of the platform, between a first and second work position, through a cavity formed in the platform supporting base.

Abstract: A multi-function industrial robot employs an servo motor to select one tool for use from among a plurality of tools mounted on a turret, the base of which is fixed to an end of a vertical spindle and supports a turret shaft that lies at an angle of 45.degree. with respect to the spindle. The turret head on which the tools are mounted is fixed to one end of the turret shaft and it and the tools are configured so that one active tool will be coaxial with the spindle, and a bevel gear mounted at the end of the turret shaft opposite the turret head engages a bevel gear mounted on the robot frame. The spindle can be raised and lowered such that at its uppermost position the two bevel gears engage, and a mechanism that normally prevents rotation of the turret shaft is released so that as the spindle turns the turret-mounted bevel gear revolves about the stationary bevel gear and drives the turret shaft and the turret head for rotation.

Abstract: In a multiple axis electrical discharge machine having a pair of indexable turrets each of which carries a plurality of electrode cartridges each with a supply of electrodes, the improvement of individually releasable electrodes in each cartridge which are configured to be transferred to a tool holder to be precisely positioned therein; the machine further includes a programmable electrode tool holder carousel and opposed tool carriers for moving preselected combinations of tool holders and electrodes between an electrode transfer station and a tool changer for transferring the selected electrode to a servo driven spindle head.

Abstract: A machine tool in which processing can be performed on the workpiece from two directions and in which various types of machining processes other than turning can be performed on the workpiece by means of a turret on which a plurality of tools are mounted. The turret is freely indexible on a tool rest which is mounted on a horizontal guide for horizontal positioning. The horizontal guide is mounted for vertical positioning on a vertical column which is in turn mounted on a horizontal slide member the axis of which is perpendicular to the horizontal guide section supporting the tool rest. A workpiece holder is mounted for free rotation on the frame of the machine tool. The turret may thus be positioned and indexed so as to select one of a variety of processing tools such as a cutting tool, a drill, a milling cutter, or the like, and to perform the processing in either a horizontal or vertical direction.

Abstract: A machine tool has a base (6), a XY table (5) arranged at the base (6) for holding a work (W) thereon in such a way that the XY table (5) can move together with the work (W) in a first direction and a second direction perpendicular to the first direction, means (2, 3) for controlling the XY table (5), an indexing table (17, 67) placed above the XY table (5) in such a manner that the indexing table (17, 67) can move for the indexing purpose, and a plurality of spindle heads (24, 25, 44, 45) attached to the indexing table (17, 67).

Abstract: In accordance with the present invention, there is provided a cutting tool having a cutting tool insert which is automatically rotationally indexable. The cutting tool includes a shank and an indexable cutting tool insert rotatably connected to the shank. The insert includes a plurality of cutting edges and side surfaces therebetween. The cutting tool is also provided with an indexing device, lock pin, cam plate and eccentric cam pin. The indexing device comprises a sliding key and a pair of spring metal legs attached thereto for engaging a serrated portion of the lock pin to which the cutting tool insert is attached. The indexing device is effective for indexing the insert on the lock pin upon rotation of the cam pin which effects a lateral movement of the cam plate along the longitudinal axis of the shank whereby the cam plate engages the sliding key causing it to also move laterally to engage the indexing legs on the lock pin resulting in rotation of the lock pin and the cutting insert attached thereto.

Abstract: A new and improved indexing table for supporting a workpiece on a machine tool and the like includes a base with a workpiece supporting table carried on a support shaft journaled for rotation to index the workpiece for machine tool operations. A drive system is provided for rotating the table in one direction about a longitudinal axis of the support shaft and an indexing wheel is provided on the shaft having a plurality of index slots spaced angularly around the periphery for securing the table in selected indexing positions. A shot pin is provided for engaging selected slots in the wheel to lock the table in a fixed position and when the shot pin is retracted, the table is then permitted to rotate toward a next indexing position.

Abstract: An improved machine tool (10) has a driven cutting tool (T) which is rotatable about an axis (C) extending perpendicular to the axis (B) of rotation of a turret (200) when a toolholder (300) is mounted on an end face (203) of the turret (FIG. 7). The cutting tool is rotatable about an axis extending parallel to the axis of rotation of the turret when the toolholder (300) is mounted on a side face (204) of the turret (FIG. 10). A drive assembly (600) is operable to drive the cutting tool when it is mounted on either the end face (203) or the side face (204) of the turret. The drive assembly (600) extends through the turret and has output at a location disposed between the end and side faces (203, 204) of the turret. A pair of actuators are (400, 500) provided to operate the toolholder (300) to engage and release the cutting tool (T) when the toolholder is mounted on either the end face or side face of the turret.

Abstract: The center comprises a conveyor, a motor-driven carriage equipped with a gripper to move a section (2) over the conveyor, along a numerical axis toward the fixed frame (7) of a machining station, and a vise (11).In accordance with the invention, the machining station includes only the following: two moving elements (16, 21) adapted to move along cross-axes, the first said element (16) being movable relative to the fixed frame (7) and the second (21) being movable relative to the first (16), said second moving element (21) carrying a swivelling spindle head (25) equipped with at least one tool (5).Also, the actuator (22) which controls the movement of each said element is a multipurpose actuator selectively controlled by the main numerical control program to execute either positioning-only commands, or feed-only commands, or combined commands, among others.

Abstract: A turret for an automatic lathe has a coupling sleeve connected with the driven shafts at each of a plurality of tool stations and actuated by a plunger displaceable parallel to the turret axis to couple the sleeve with the driven shaft when the tool is positioned at the working location. All of the driven shafts are continuously rotated by gearing connecting the driven shafts with the drive shaft extending along the axis of the turret.

Abstract: A boring apparatus and process comprising suspending a boring bar for boring a hole in a workpiece for universal pivotal movement in all directions. Then, the workpiece is brought below the boring bar with the axis of the hole being vertical. Thereafter, the boring bar is lowered and eccentrically passed through the hole in the workpiece and slidably and rotatably supported at least at two points thereof axially spaced apart. Then, the boring is effected by the rotation and axial relative movement of the boring bar with respect to the workpiece, with the axis of the boring bar aligned with the axis of the workpiece.

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 machine tool with a vertically reciprocating spindle head has an automatic tool changer including a rotatingly indexable tool support connected to the machine tool frame and vertically movable independently of the spindle head, a first cam-and-crank mechanism activated by spindle head vertical movement to move the tool support with the spindle head during a portion of the tool changing operation, a second cam-and-crank mechanism also activated by spindle head vertical movement for opening and closing a tool holder on the tool support during another portion of the tool changing operation, and a vertical stop for preventing vertical movement of the tool support with the spindle head into the machining region.

Abstract: A cam mechanism includes a continuous rotary shaft connected to a drive source, a cam fixed on the rotary shaft to convert each continuous rotation motion of the rotary shaft to a compound horizontal and vertical motion, and an output member coupled with the cam. The cam comprises a single piece, disc-shaped compound cam having in its upper surface an endless groove formed of continuously-arranged arcuate and non-arcuate groove portions and an endless guide the depth of which from the upper surface of the compound cam varies continuously. The output member is supported displaceably in the horizontal and vertical directions relative to the compound cam and includes at least one roller engaged with the groove and the guide of the compound cam.

Abstract: A drilling machine tool is disclosed having a machine tool body with a movable frame which is movable in the three axial directions X, Y and Z, of a rectangular coordinate system.

Abstract: The machining apparatus includes a machine tool having a primary spindle slide with a transversely extending tool head support rail member thereon which is aligned successively with a tool head load rail mechanism and unload rail mechanism on a side of the machine tool by movement of the primary spindle slide to load or unload a multi-spindle tool head. When the tool head is loaded in operative position on the rail member, the spindles of the tool head are driven by the primary spindle through a gear train in the tool head. An overhead gantry robot conveys tool heads between the load and unlaod rail mechanisms and a stationary tool head storage unit on the side of the machine tool.

Abstract: A robot installation for performing a plurality of assembling or machining operations at a work or assembly station comprises a robot with a rotatable tool support, e.g. a ring or disc, carrying a number of tools. The turning and positioning of the tool support are controlled by control equipment of the robot. The tools are adjustably positioned on the tool support.

Abstract: In a machine tool comprising a column (2) mounted for a horizontal sliding movement, a drive unit (4) mounted on the column for a vertical sliding movement, and a magazine (7) located above the drive unit and mounted on the column for a rotational movement and for a horizontal sliding movement, the magazine is particularly adapted to store a plurality of gang heads (8) and individual tools (9) which may be equipped selectively to the drive unit one by one. The drive unit includes a first clamping device (16) disposed within a spindle (14) thereof and further plural second clamping devices (18) which contributes to clamp each of the heads firmly to the unit so that large-scaled gang heads may be employed.Gang heads and tools may be exchanged quickly between the drive unit and magazine. Portions of workpieces unworkable by large-scaled gang heads may be worked by the individual tools.

Abstract: The head of a plano-milling machine has two jointly rotatable, perpendicularly-related collet spindles journalled on bearings in a box-like housing which can be mounted on the slide of the machine so as to be indexable about the axis of the vertical collet spindle to present the horizontal collet spindle to different vertical faces of a workpiece.The head is journalled to the slide by a combined indexing means and hydrostatic bearing which includes means to lock the head in a chosen angular position. Provision is made for numerical control and automatic tool changing.

Abstract: An apparatus for the variable machining of workpieces is described which consists of a central module, which is constructed as a hollow carrier unit and which takes over the functions of the machine housing, and also of a plurality of horizontal and vertical modules which can be selectively connected with this central module and with one another via predetermined mechanical and electrical interfaces. The central module has an outwardly disposed and rotatably mounted carrier sleeve which can be axially displaced by a restricted amount, which can also be clamped, and which has mounts for tool support units, with the mounts extending over only part of the height of the carrier sleeve and being distributed around its periphery. The inner chamber of the central module is provided with fitted guide surfaces for a vertical module which is constructed as a columnar unit with a base end connection surface and with external guide surfaces complementary to the guide surfaces of the central module.

Abstract: A machining center having an upright boxlike housing which projects upwardly adjacent the rear side of the table through a substantial vertical extent. The housing defines an interior chamber therein in which is positioned a movable support for mounting a plurality of tools. This housing has a pair of sidewalls which, at their front edges, have forwardly projecting protrusions which overhang the table. A slide is mounted on the upper surfaces of the housing and is movable horizontally in perpendicular relationship to the table movement. This slide, on the front end thereof, mounts a tool spindle head for displacement along a vertical axis. The front wall of the boxlike housing has an opening which extends therethrough and projects vertically up through the top wall thereof, so that rearward slidable displacement of the slide permits the spindle head to be moved rearwardly into the interior chamber to provide access to the stored tools.

Abstract: A boring, milling, thread cutting or analogous machine has a frame for a work supporting table and a first carriage which is reciprocable in the X-direction. The first carriage supports an open-and-shut magazine for a supply of spare tools as well as a second carriage which is movable in the Y-direction. The second carriage supports a headstock which is movable with a vertical tool spindle in the Z-direction. The magazine is opened in automatic response to movement of the second carriage in the Y direction and to a predetermined position in which the tool spindle can be relieved of the tool thereon by being lifted upwardly. An indexing mechanism of the magazine then places a selected tool into the path of downward movement of the spindle so that, when the spindle descends, the freshly selected tool is automatically coupled thereto. The second carriage is thereupon moved in the direction of the Y-axis to enable the magazine to become shut.

Abstract: An automatic tool changing mechanism includes a spindle mechanism (11) having at least a spindle (11a) and a first gear (11b) rotatable in unison with the spindle; a spindle motor (12) for rotating the spindle; a tool magazine (20) having at least a storage unit (20b) for storing a plurality of tools (21), a second gear (20c) rotatable in unison with the storage unit, and a slider (20e) slidably mounted on the spindle mechanism; a Z-axis motor (19a) for moving the spindle mechanism in the direction of a Z-axis; a constraining member (23) for constraining the tool magazine against movement thereof in the direction of the Z-axis and a control circuit (102, 103) for controlling the indexing. During machining operation, the first and second gears are brought out of mesh with each other, and the spindle is rotated by the spindle motor at a prescribed speed to enable a tool mounted on the spindle to machine a workpiece.

Abstract: An interchangeable robot end-of-arm tooling system is provided for performing multiple tasks using interchangeable tools within a work cell. The system includes a computer control for the system attached to the robot controller, a quick change adapter, and at least two tools adapted for attachment to the quick change adapter.

Abstract: An automatic tool changer of a machine tool comprises a spindle head (4) rotatably carrying a spindle (2), and a tool magazine (40) having a plurality of tools (42). A pair of gears (46, 48), one on the spindle and the other on the magazine, are provided to drive the magazine to index it by means of the spindle drive motor (6). The two gears (46, 48) are engaged upon the tool changing operation and disengaged upon the machining operation. The Gear engaging and disengaging are effected by the relative axial movement of the spindle head (4) and an associated slider (30) carrying the magazine (40).

Abstract: A drilling machine for use in industrial furniture production includes a drill spindle carrier which is rotatably mounted in a gear block. Two rows of drill spindles are staggered with respect to each other by 90.degree.. Driving pinions of the drill spindles are arranged in recesses of a spacer disk of plastics material, such spacer disk spacing an upper and a lower cover plate of the drill spindle carrier.

Abstract: A portable drill with drill bit storage capability, and with mechanized bit feeding from bit storage to chuck.

Abstract: A boring machine having a work-holding spindle, a turret, and means for mounting a plurality of tools on the turret. A work-handling device is mounted on the turret having means to grip and release a workpiece. The work handling device is capable of loading and unloading the spindle.

Abstract: A machine tool for processing workpieces of various shapes comprises three processing units each mounted on a carriage to move in three axes of coordinates and each being rotatable about a horizontal axis. Each processing unit carries a tool holder having tools and being turnable in two opposite directions. A workpiece is clamped in a workpiece holder so that it is immovable during operation and can be treated at least at three sides thereof simultaneously.

Abstract: A turret lathe having a part gaging probe at one position on the turret. The lathe has a probe cover supported in a holder when the probe is in use. The numerically-controlled lathe mechanism enables the turret to carry the probe over the cover to apply or remove the cover during the cycle of operations.

Abstract: The tool changing mechanism is provided with means for the direct transfer of tools through the working sleeve or spindle. The transfer means preferably have rapid clamping means, which are controlled by the working movement of the spindle or sleeve, so that there is no need for a separate transfer station for the tools from the magazine to the spindle or sleeve, so that much space is saved. The magazine is preferably essentially arranged around the assembly for receiving and guiding the working spindle or sleeve. Preferably, the magazine is substantially located over the projected base surface of the machine working table.

Abstract: A tool changer for an EDM apparatus provided with a reciprocable machining head having a tool holder mounted on the end of the machining head. The tool changer comprises a rotatable indexable turret supporting a plurality of electrode tools each integrally provided with a support member for attachment of the electrode tool/support member assembly to the turret. Successive machining operations are effected by the machining head carrying an appropriate electrode tool, and at the end of each machining operation the electrode tool/support member assembly is attached to the turret.

Abstract: This invention relates to an apparatus for profiling, truing or dressing, with precision, an abrasive millstone, by cutting using diamond tools.The apparatus comprises a truing head 15 consisting of a cylinder 16 which is provided with a series of separate retractable diamond tools 17, each of which is capable of being regidly locked opposite the truing station of the millstone.

Abstract: A machine tool for sequentially machining workpieces with different tools which may be clamped in a spindle of the machine tool, comprising a magazine in which the tools are disposed in a ring pattern and held in holders such that the holder of the tool to be clamped in or unclamped and removed from the spindle is in alignment with the spindle axis during the tool change, is characterized in that the holders of the magazine are distributed about the spindle axis, that each holder is provided with its own drive which moves it into a position where it is aligned with the spindle axis (clamping position) and into a position outside the spindle axis (magazine position) and that the holder remains aligned with the spindle axis while the tool held therein performs a machining operation. This permits a very quick tool change.

Abstract: The present invention is directed to a gang head for a replaceable gang head type machine tool. The machine tool includes a base, a jig table, a driving member mounted on the base and movable to an advance and retract with respect to the jig table, and an annular rail surrounding the driving member. The annular rail has a rear stationary rail and a movable front rail, the movable rail movable to advance and retract with respect to the jig table along the same direction as the driving member. The gang head comprises a base frame mounted on the movable rail, a working unit mounted on the base frame, wherein the working unit is inclined at an angle other than a right angle, with respect to the direction of advance and retraction of the movable rail, an oil pressure pump, and an oil pressure operated cylinder. The oil pressure cylinder being operatively coupled to the working unit for advancing and retracting the working unit with respect to the jig table.

Abstract: In an indexing system for a member such as a turret head of a lathe, in which the member after undergoing an indexing movement is locked by a locking bolt thrust by spring force into a bolt hole in a plate coaxially fixed to the member, a hydraulic cylinder is used to exert a great force for holding the locking bolt positively and unmovably in each bolt hole against any reactive counter force from the side of the member due to a great load. The hydraulic cylinder is controllably actuated by a single hydraulic system containing also a hydraulic motor for driving the member in its indexing movement and a solenoid valve.

Abstract: A fastening apparatus which includes a supporting column with a working station installed on one side at the lower end thereof. Upper and lower annular rails are supported on and coaxially surround the upper portion of the column with a portion of the annular rails being vertically movable. Plural multi-spindle fastening heads are supported on the rails and movable circularly there around. An indexing device is mounted on the upper portion of the column for selectively engaging in moving a desired one of the heads to a position above the working station where the vertically movable portion of the annular rails is provided. A connecting head supported by the upper portion of the column is engageable with the fastening head that is positioned over the working station for supplying power thereto from a separate power source. The movable portion of the annular rails raises and lowers the selected fastening head to perform the fastening operations on the work piece at the working station.

Abstract: An automatic rotational cutting edge changer for use with a tool tip having a plurality of cutting edges. When a sensor detects wear or chipping in the cutting edge in use, the cutting edge changer moves this cutting edge of the tool tip out of the cutting position of the cutting tip and brings a new cutting edge of the same tool tip to the cutting position by keeping the tool tip supported in position on a rotating member and causing the rotating member to be urged in its rotating direction by a lever operated by an actuating device for the cutting edge changer.

Abstract: An automatic tool change machine tool having a vertical column on which a tool stock receiving therein a vertically movable tool bar is mounted. The tool bar is provided with a toolholder receiving means at the lowermost end for the attachment of a toolholder having a cutting tool. The machine tool further has a toolholder magazine storing a plurality of toolholders. The magazine is turned around the vertical column so that one of the toolholders is indexed to a predetermined position where toolholders are attached to and detached from the tool bar in one reciprocal vertical movement of the tool bar.

Abstract: The invention relates to apparatus for the transverse and/or longitudinal machining of wooden workpieces, comprising a workpiece carriage for mounting a workpiece or a plurality of workpieces thereon and adapted to be displaced in the direction of the X-axis of a spatial X-Y-Z coordinate system along at least one transverse machining tool itself adapted to be displaced in the Y- and/or Z-axis for the machining operation. The object of the invention is to provide an apparatus of the above indicated type, which is of simple construction and by means of which the transverse machining of a workpiece can be carried out in a single mounting position of the workpiece and at a single machine location. In order to attain this object, the invention provides that the workpiece carriage comprises a mounting table adapted to be tilted about an axis parallel to the X-axis.

Abstract: A facial relief and seal creates a closed damping chamber between the spindle end face and adjacent tool support plate. A plurality of tools are located on the face plate near the outer periphery. In one embodiment, a viscous medium, such as oil, is provided in the damping chamber. In an alternate embodiment, a visco-elastic material, such as PVC, is provided in the damping chamber. Relative movement between the spindle end face and the tool support plate will cause vibration damping.

Abstract: A novel machining center having a plurality of tools, including adjustable tools incorporating an externally accessible rotatable socket for fine-adjusting the tool bit thereon; a tool drive for actuating each tool; a storage device for storing a plurality of tools, at least one of which is one of the adjustable tools, the storage device being operable to move the tools between first and second positions; an automatic tool changer for transporting a tool in both directions between said first position and the tool drive; a powered wrench engagable with said socket on an adjustable tool disposed in said second position; a numerical controller for controlling the operations of said machining center; and a technique for inputing to the control means information as to the identity of a given adjustable tool requiring adjustment and the amount of adjustment desired, said powered wrench being actuatable to engage said socket of said given adjustable tool in response to said information when the given tool is in said

Abstract: A machining center for at least one of a drilling or milling operation. The machining center includes a machine frame at which an outrigger is attached, with a tool spindle, driveable to execute stroke movements and rotary movements, being mounted to the outrigger. The tool spindle is adapted to be moved from an end position, in alignment with a tool carrier present in the tool magazine and connectible to the tool spindle, axially for being coupled to the tool carrier and then further movable axially for machining of workpieces. The tool spindle is rotatably mounted at a slide arranged at the outrigger and guided along a straight guide extending in parallel to an axis of rotation of the tool spindle. The slide serves for axial movement of the tool spindle for executing axial strokes intended for workpiece machining and for an exchange of a tool carrier. The slide has a zone through which the tool spindle extends, which zone may pass through a gap of the tool magazine.

Abstract: A tool change device, for transferring selected tools between a rotary tool magazine and the rotary spindle of a machine tool. The magazine has a plurality of sector-shaped tool holders, in each of which one tool is stored. Tools are individually loaded or unloaded at a corresponding orientation of the magazine, at which a selected sector-shaped tool holder is in axial alignment with the machine spindle. When in such alignment, the sector-shaped tool holder is moved axially into cooperative relationship with the spindle and tool transfer is effected. Means are provided to lock each of the sector-shaped tool holders into an inactive axial storage position, except when selected.

Abstract: A power tool includes a turret rotatably mounted on a hub, a first shaft rotatably mounted in the hub and a second shaft mounted for rotation in the turret and for aligned rotating engagement with the first shaft in the hub. First and second members, including a resilient member, are provided in the first shaft for engaging the second shaft.

Abstract: A vertical spindle numerically controlled machining center includes a stationary bed or base on which a workpiece holding table is slidably mounted for movement along a first axis. A vertically extending upright or column, having a vertically reciprocal spindlehead slidably mounted thereon, is slidably mounted on the bed for movement along a second axis perpendicular to the first axis so that the spindlehead overlies a portion of the table. Within the upright is a recess adjacent to the bed. A tool storage magazine is located in the recess and is slidably mounted on the bed for movement through the recess along an axis parallel to the second axis. During a tool change cycle, the toolholder then held in the spindle is returned to the tool storage magazine by first moving the spindlehead to the ready position and then moving the tool storage drum toward the spindlehead to engage the tool then held in the spindle.

Abstract: A machine tool has a table, a standard, a head part displaceable on the standard relative to the table, a main spindle arranged in the head part, an electric motor arranged in the head part for driving the main spindle in rotation, a tool changing arrangement arranged in the head part for aligning and coupling a tool with the main spindle, and a rotary element for displacing the head part relative to the table, which rotary element is arranged so that it is rotated by the electric motor and displaces, during the rotation, the head part relative to the table.

Abstract: A vertical-type machining center having a spindle carrier which travels in the vertical direction and a turret capable of both rotation and upward and downward movement provided on the spindle carrier, wherein tools are automatically changed over through rotation of the turret caused by relative movement between the turret and the spindle carrier when the upward movement of the turret is checked by a restraining member. A Z-axis position pulse generator is provided on a spindle mechanism drive member, such as the vertical drive motor or a screw shaft, and is adapted to generate a pulse for each revolution of the drive member. The pulses are counted by a counter which delivers a counted value for use in computing the vertical position of the spindle mechanism. The arrangement is such that the rotational speed of the vertical drive motor is controlled so as to move the spindle mechanism at an optimum speed suitable for the vertical position thereof.