Abstract: An improved tool pulling force magnification mechanism for use in a spindle is disclosed. It comprises: (a) a draw bar contained in the hollow portion of the spindle shaft, the draw bar having a front end and a back relative to a tool to be pulled; (b) a spring sleeved on the draw bar at the back end thereof, (c) a slider located at the back end of the draw bar behind the spring to receive a squeezing force therefrom, the slider is provided with a first ring slot having a first forwardly tapered surface on an outer surface thereof; (d) a second ring slot having a second forwardly tapered surface formed on an external surface of the hollow portion of the shaft near the first forwardly tapered ring slot; and (e) a recess provided at the back end of the draw bar having an end face.

Abstract: In a vertical machining center, a spindle-drive sleeve is axially immovable in the machine frame, but rotates about its longitudinal axis to rotate a spindle mounted in the sleeve for rotation by the sleeve while axially slidable independent of the sleeve. A linear drive, non-rotating ball screw connected to the upper end of the spindle is driven axially by a rotationally powered, axially anchored ball nut to advance and retract the spindle in the sleeve. A drawbar coupling system extends inside the spindle from the top to the bottom to connect to any one of various toolholders in an index disk which is rotatable for positioning toolholders sequentially in line with the spindle axis. A pneumatically actuated drawbar operator shaft extends inside and coaxially with the ball screw from the top to the bottom. The shaft actuator is mounted to the top of the ball screw and drives the shaft axially inside the screw when a toolholder is to be approached for connection.

Abstract: The device for transferring a pressure medium has a stationary outer component with first pressure medium channels and an inner, rotatably drivable component inside the stationary outer component radially spaced at a distance from the stationary outer component. The inner component has second pressure medium channels. The outer component is connected to the housing of a machine tool and the inner component is connected to the machine spindle. A first and a second intermediate member in the form of an annulus are provided. The first and second intermediate members are positioned fixedly in the space between the inner and the outer components for bridging the distance between them. The first intermediate member has at least one first connecting channel and the second intermediate member has at least one second connecting channel.

Abstract: A coupling system between a tool system module, such as, for example, a tool receptacle, and a machine tool, such as, for example, a spindle. In order to provide for rapid initiation and release of the connection between these components while making large axial forces available, this incorporates a clamping system with an operating rod, by means of which a wedge drive is controlled, with which clamping elements that are provided in one of the parts that are to be coupled can be forced essentially radially outwards into suitably configured recesses in the other part that is to be coupled.

Abstract: A holder for a tool or workpiece has a tubular working spindle centered on and rotatable about an axis, an elongated pulling element axially displaceable in the spindle and having a front end provided with holder jaws and a rear end with a forwardly directed face perpendicular to the axis. An actuating body axially displaceable in the spindle forward of the element face has an outwardly directed and rearwardly inwardly inclined face. A spring between the spindle and the body urges the body continuously backward. At least one wedge in the spindle between the body and the element face has a rear end face flatly abuttable with the element face, an inclined inner face flatly abuttable with the body face, and a forwardly outwardly inclined front end face.

Abstract: A main shaft locating mechanism for change of tool, comprising a locating seat disposed with an eccentric, and a splined shaft disposed with a disk having an eccentric locating pin corresponding to the eccentric hole of the locating seat and adapted to axially fit thereinto. The disk and eccentric locating pin are formed with several orifices from which high pressure gas is injected, forming a gas pad between the eccentric locating pin and the locating seat to greatly reduce friction therebetween before the eccentric locating pin is fitted with the locating seat, whereby the main shaft stops rotating before the the tool is loosened. After the main shaft is stopped and located and the tool is loosened, the direction of the high pressure gas is changed to blow into the mandrel so as to clear up cutting chips accumulated therein for facilitating next tool-changing operation.

Abstract: An ultrasonic machining device 10 is attached to a movable carriage 3, and has a borehole 11 to whose free end a differential screw 14 is threaded. To clamp a tool 20, first the device is returned to a neutral position whereat a wrench 25, which is mounted stationarily in a frame 2, engages the differential screw which rests on a shoulder of the wrench with low prestress. The wrench is then rotated until the screw projects a specific amount beyond the end of the device. The tool is then threaded onto the screw until it abuts the device 10, and finally the screw is tightened by a pneumatic cylinder 32.

Abstract: A coupling system between a tool system module, such as, for example, a tool receptacle, and a machine tool, such as, for example, a spindle. In order to provide for rapid initiation and release of the connection between these components while making large axial forces available, this incorporates a clamping system with an operating rod, by means of which a wedge drive is controlled, with which clamping elements that are provided in one of the parts that are to be coupled can be forced essentially radially outwards into suitably configured recesses in the other part that is to be coupled.

Abstract: The tool spindle has a drive plate on which a cutter is mounted. Drive keys on the drive plate engage slots in the cutter so that the cutter rotates with the drive plate. A clamp bar is provided to clamp the cutter against the drive plate. The cutter is formed with clearances which register with the clamp bar when the cutter is rotated relative to the clamp bar, so that the cutter may be removed from the drive plate. A new cutter is then reverse rotated into a position in which it may be clamped by the clamp bar. A spring holds the clamp bar in its clamping position. The quick change system also includes two or more locking fingers which are activated by centrifugal force to maintain the cutter clamped to the drive plate even in the event of failure of the spring which normally holds the clamp bar in its clamping position.

Abstract: A tool clamping and releasing device comprises an axially movable tie rod and a shifting apparatus for the tie rod actuated by cup springs. The shifting apparatus comprises a sliding collar subject at one end to the action of the cup springs and which is provided with cams on the opposite end. A rotary collar has pins engaging the cams so that axial movement of the sliding collar rotates the rotary collar, which has a ramp; the tie rod has a cooperating ramp, so that axial movement of the sliding collar causes rotation of the rotary collar and axial movement of the tie rod.

Abstract: An improved tool holding apparatus includes a collet chuck or a steel ball chuck that clamps a pull bolt, which defines the forward end portion of a tool, by resilient force applied thereto from a coned disc spring. The tool holding apparatus further includes a temporary clamping device which is buried in a sleeve to temporarily clamp the pull bolt. A clamping force applied by the temporary clamping device is set at such a level that an arm can draw the tool from a main spindle by gripping the rear end portion of the tool.

Abstract: A toolholder for securing a tool in the collet of a mill, the collet having a fluted open end wherein the toolholder is a pair of concentrically arranged cylinders, one cylinder inside the other and each having flutes. The inner cylinder has an axial bore for receiving the shank off the tool so that the flared end of the spindle squeezes the fluted ends of the pair of cylinders and the shank of the tool so as to secure the shank of the tool concentric with the collet and spindle of the mill.

Abstract: A machine tool system includes a clamping unit installable on the head of a cutting machine, and a tool holder insertable into the clamping unit. The clamping unit includes an annular guide member and a sleeve telescoped onto the guide member. A flat drive key is positioned in an axial slot in the sleeve to establish a driving connection between the clamping unit and the tool holder. The tool holder is wedged into the clamping unit by means of radially-movable wedge lock elements and an axially movable drawbar.

Abstract: A machine tool equipped with an automatic tool changing device, including a tool support having a clamping mechanism for holding a cutting tool, a tool transfer device having a tool gripper for transferring the tool to and from the tool support at a tool change position, and a device for moving the tool support and the tool transfer device in a direction perpendicular to the axis of the tool held on the tool support, the tool changing device including a mechanism for converting a first relative movement of the gripper and the tool support toward each other, into a movement of the clamping mechanism for unclamping the tool from the tool support, and converting a second relative movement of the gripper and the tool support away from each other, into a movement of the clamping mechanism for clamping the tool to the tool support, wherein the gripper has a pair of jaws shaped for engagement with the tool held on the tool support before the tool is unclamped, and for permitting completion of the first relative move

Abstract: An assembly for releasably connecting the machine draw rod to a chuck draw rod both of which rotate about an axis, the assembly including a female member having a first end operatively attached to the machine draw rod member and defining a receptacle, the receptacle having at least one locking recess. A male member has a first end operatively attached to the chuck draw rod and includes an insertion portion opposite the first end which is adapted to be inserted into the receptacle. The insertion portion defines at least one detent opening. The male member includes at least one detent ball positioned within one detent opening and which is movable from an unlocked position to a locked position with respect to the locking recess when the insertion portion is inserted into the receptacle. The male member also includes a plunger for moving the detent balls from the unlocked position into the locked position when the plunger is in a forward position.

Abstract: A quill is rotated in a spindle and carries a tool which is rotated with the quill about a common axis. The tool is held in a bore in the quill by a combination of a tool receiver, a drawbar and an attachment member which is shrunk fit to the tool. The overhang of the tool is greatly reduced and tilting takes place through the base of the attachment member rather than through edge loading of the tool in a bore.

Abstract: A spindle extension, especially for drilling and milling operations is desirable to complete many modern die molds or to protect the host machine spindle from undesirable wear. The inventive spindle extension contains its own pull stud draw bar assembly that works in tandem with the host machine power draw bar that is easily activated to provide quick and secure tool changes. Surrogate and long-reach embodiments are disclosed.

Abstract: A mechanical chuck for clamping the shank of a tool comprises a receiver having a forwardly open, rearwardly tapering socket. A pull rod is mounted for front-to-rear reciprocation in the socket. The pull rod is connectible to the tool shank. A plurality of pins are mounted in the receiver for front-to-rear movement therein. Rear ends of the pins engage the pull rod. A nut is threaded on the outside of the socket so that when rotated, the nut displaces the pins rearwardly. The pins displace the pull rod and shank rearwardly, so that the shank is tightly engaged in the socket.

Abstract: A driving device for driving a head of a rod in a milling machine includes a board slidable up and down relative to the milling machine, a driving mechanism disposed on the board, a socket secured to the lower end of the driving mechanism and located above the head of the rod, a cylinder disposed on the bolt, a piston fixed on top of the bolt and slidably engaged in the cylinder. The socket is engaged with the head of the rod when the board and the driving mechanism are moved downward by the cylinder.

Abstract: A ball lock assembly having a cutting head and a locking component including a lock rod carrying at least one locking member. A positioning assembly operatively connects to the lock rod so that one can move the lock rod between a locked position and an unlocked position. In the locked position the locking member engages the cutting head to hold the cutting head to the locking component. In the unlocked position the locking member does not engage the cutting head so that the cutting head is not held to the locking component.

Abstract: A clamping device for individual tools has a spindle and a pulling member nnected inside the spindle. The pulling member has a conical clamping and centering element projection from the spindle. A tool holder has an end face with a recess, the recess having at least one conical mantle surface. The conical mantle surface cooperates with the conical clamping and centering element for clamping and centering the tool holder at the spindle.

Abstract: A connection system for connecting an interchangeable tool head to the spindle of a numerically controlled machine includes radially displaceable wedge members which when actuated radially to an outer clamping position provide for a clamping connection between the spindle and the tool head. When actuated to an inner release position the system allows for withdrawal of the tool head from the spindle. The wedge members are displaced by a central actuating rod connected to the wedge members via cam means such that the wedge members are positively driven by the cam means in both radial directions of movement.

Abstract: For changing the tool disk connected detachably and rotatably to the housing of a tool turret, a work-locating fixture is provided. The tool disk can be moved out of its work setting in which it is coupled with the drive shaft for rotation by a rotary drive. The tool disk movement is in the axial direction of the drive shaft away from the housing until the tool disk reaches transfer position. The drive shaft and a tie rod coupled to the drive shaft are then rotated by the rotary drive out of a connected setting into a detached setting. In the detached setting, the connection between the tie rod, which tie rod is slidable in its axial position relative to the housing and the tool disk, is disconnected, so that the tie rod can then be lifted out of the tool disk.

Abstract: A shank (10) for retaining a tool or touch probe in the socket (S) of a machine tool spindle comprises 6 areas of surface which, in use, bear against the wall of the socket (S). The areas of surface are provided by three balls (34) resiliently supported for movement radial to a shank axis (A) on small flange section (26) (FIG. 2 ) at one end of the shank (10), and three further balls (36) embedded in the other end of the shank (10). As the shank is drawn into the socket (S) the small flange sections (26) deform allowing the balls (34) to move radially inward until the surface of balls (36) engage the wall of the socket (S). A pull-up stud (38), supported on a frusto-conical block (40) is connected to the shank by a plunger (42) and compression spring (46). Retraction of the shank into the socket by pull-up stud (38) against the resilience of the small flange sections (26), causes the plunger ( 42) to compress spring (46) until the block (40) bears firmly against the wall of the socket (S).

Abstract: A mechanism for clamping a cutting tool holder in a socket formed in an end face of a clamping unit in a cutting machine. An axially movable drawbar has a multiple number of flat surfaces obliquely angled to the drawbar axis for exerting cam forces on individual wedge elements that are slidably guided for outward movement into wedge lock engagements with an inturned flange on the tool holder. The wedge elements exert axial forces on the tool holder internal flange for simultaneously achieving a relatively tight fit of the tool holder in the associated socket and a seating of the tool holder against an end face of the clamping unit. The mechanism can be used in rotary or non-rotary machines.

Abstract: A coupling system for selectively locking a tool to a toolholder, in which the locking mechanism carried by the toolholder has a cross-sectionally compact structure and provides release assist when the tool is being removed from the toolholder. The body of the toolholder has an axial drawbar bore in which a drawbar selectively slides. The forward end of the drawbar bore in combination with the forward end of the drawbar form a tool profile cavity which is contoured to seatably receive a tool profile of the tool. The drawbar is hollow and is provided with a pair of apertures. The locking mechanism within the drawbar comprises a pair of locking fingers which are pivotally mounted on a common pivot pin connected with the body. Each locking finger may rotate so as to be retracted within the drawbar or erupt out of the apertures in the drawbar. Rotation of the locking fingers is effected by interaction between the apertures and the locking fingers as the drawbar is axially moved in the drawbar bore.

Abstract: A spindle unit comprising a solid shaft main spindle of a highly rigid material such as cemented carbide, with the main spindle being rotatably supported in a spindle head by bearings less apt to generate heat. A tool-clamping device including an adapter attached to a front end of the main spindle, and a tool holder carries a rotary tool. On of the adapter and the holder comprises a short columnar lug, with the other of the adapter and holder comprising a cylindrical hole shrinkage-fitted on the lug. The member having the hole is made of a material having a coefficient of thermal expansion lower than a coefficient of thermal expansion of the other member. The tool-clamping device further comprises heating and cooling devices for heating and cooling the member having the hole.

Abstract: An apparatus is provided for transmitting rotation about and translation along a first axis from a driver to a toolholder with a spindle along an axis non-parallel from the first axis. A shaft is rotatably mounted within a sleeve which is slidably mounted within a bore along the first axis. The sleeve has an inclined surface at one end which when the sleeve is translated engages an interface member to provide displacement.

Abstract: An actuation member (B) supported by a housing (A) is actuated for clamping upwardly by means of a spring force and actuated downwardly for unclamping by means of an actuation means (D). A piston (11) is inserted into a cylinder (10) fixedly secured to the upper portion of the housing (A), and a liquid sealing chamber (12) is formed below the piston (11). The piston (11) is fixedly secured to the actuation member (B). When the actuation member (B) is held in the clamped condition, a liquid sealing valve (15) is closed so as to seal an oil (L) within the liquid sealing chamber (12). Whereby, in case that a pulling down force larger than the clamping spring force is imposed to the actuation member (B), a pressure generated within the liquid sealing chamber (12) serves to prevent the piston (11) from lowering, against the pulling down force.

Abstract: A machine tool that includes a rotary spindle having a radially movable cutter element. An axially movable drawbar within the spindle is used to move the cutter element to its retracted or extended position. A harmonic drive unit is carried on the spindle for imparting rotary movement to a cam element that has a driving connection with the drawbar. The harmonic drive unit can be controlled through a remotely-operated brake that is adapted to be selectively engaged with a reaction member that forms part of the harmonic drive unit.

Abstract: A spindle and Z-axis unit comprises a spindle housing and a hollow rotor shaft rotatable and axially movable with respect to the spindle housing. The rotor shaft carries a collet at its lower end for chucking a machine tool such as a drill bit. The tool is changed in the collet by pneumatic actuation of a diaphragm which actuates a push rod within the rotor shaft to move the collect axially against a spring bias to clamp and unclamp the tool. The shaft is moved in the Z-direction along with a thrust bearing assembly by a screw nut which actuates a road to move the rotor shaft in the Z-direction to drill a workpiece after a pressure foot has first been moved to clamp the workpiece with respect to the spindle. Thus, the moving weight or mass previously attributable to parts such as a spindle saddle and spindle housing can be eliminated without impairing the reliability and chucking force of the collet mechanism.

Abstract: The present invention relates to a spindle unit of a machine tool in which tools changing is available and especially relates to a spindle unit by which a tool in a tool holder can be quickly and safely clamped and unclamped. This spindle unit is characterized in that an operating hole along with the centerline axis of a rotary spindle is provided therein for fixing (or clamping) a tool, a draw bar furnished with a cylindrical body along with the inner circumferential face of the operating hole is provided therein, the lower portion of the cylindrical body is formed on the inclination face of a wedge body, and a tool is clamped by guiding a ball by which the pull stud of a tool holder is engaged, along with the inclination of the inclination face of the wedge body, that is, by movement of the ball toward the center of the spindle, and is unclamped by the reverse movement of the ball.

Abstract: Adapter structure for and method of securing a draw bar actuated tool to a spindle having an actuating draw bar extending therethrough. The structure includes coupling members for securing the adapter structure to the actuating draw bar and to the tool draw bar and structure permitting relative rotation between the tool and spindle with the actuating draw bar and tool draw bar securely engaged. In one embodiment, the adapter structure is entirely separate from the tool while in another embodiment, the adapter structure includes a modified tool and tool draw bar.The method of the invention includes the steps of securing a tool including a tool draw bar therein to an actuating draw bar extending through a spindle, rotating the tool and tool draw bar with respect to the actuating draw bar to align securing means on the spindle and tool without relative axial movement between the draw bars and subsequently securing the tool to the spindle.

Abstract: A boring device adapted to mount boring tools for automatic tool changing, in which an eccentric mounting of relatively rotatable inner spindle 11 and main spindle (2) allows radial adjustment of the tool. Relative rotation of inner and outer spindles is accomplished by axial driving of a threaded bolt (22) by an actuator motor (67), causing rotation of a nut (19) fixed to the inner spindle (11). Continued overtravel of the threaded bolt (22) past an adjustment range (47) and safety range (51) causes releasing operation of a spring biased pull rod (36) which releases a tool clamping mechanism (14) to allow automatic tool changing.

Abstract: A clamping assembly for releasably holding a tool holder having a shank includes a tool support member having a bore extending along a longitudinal axis. A locking mechanism is disposed in the axial bore for securing the tool holder to the support member. The locking mechanism includes a lock rod having first and second contact surfaces mounted in the support member. The lock rod moves along the longitudinal axis between a locked position and a release position. A wedge rod is mounted in the support member for reciprocal movement along an axis angularly disposed with respect to the longitudinal axis. The wedge rod has first and second wedge surfaces which incline in parallel fashion from opposite edges of the wedge rod. First and second force transmitting elements are interposed between the wedge surfaces of the wedge body and the contact surfaces of the lock rod.

Abstract: An actuating arrangement for a tool clamping device (1) has a clamping bar (3) which is axially displaceable in a clamping direction in a machine tool spindle (2) under the effect of a spring arrangement (11), and a wedge transmission assembly (9) which is operable between the spindle and the clamping bar, with freely movable balls which bear respectively against three cone surfaces of which the first is provided on a clamping sleeve (10) which is axially displaceable in the clamping direction on the clamping bar under the force of the spring arrangement (11), the second is provided on a clamping ring (12) connected to the clamping bar (3) and the third is provided on a support ring (13) which is arrangd stationarily with respect to the spindle. Provided on the support ring is a fourth cone surface (18) which is inclined relative to the axis of the clamping bar in opposite relationship to the third cone surface.

Abstract: Apparatus for machining a valve seat and valve stem guide all from the valve seat side of a head or block. The valve seat is machined in one pass by a single point cutting tool which is moved on two axes and, the valve guide bore is machined by a reamer. The movements of the single point cutting tool and reamer are numerically controlled.

Abstract: A spindle device providing a hydraulic system for moving a drawbar in a tool holding direction. The drawbar extends through a spindle shaft and is slidably provided therein. A piston is fixedly connected to the drawbar, and a pressure chamber is defined by the spindle shaft, the drawbar and the piston. Upon application of hydraulic pressure in the pressure chamber, the piston as well as the draw bar are moved in the tool holding direction. In one embodiment, at least one free piston is provided in the pressure chamber for dividing the same into first and second pressure chambers. The hydraulic pressure is applied to the first chamber to urge the free piston toward the second pressure chamber in which a liquid is hermetically accumulated. The liquid pressure within the second pressure chamber is increasable higher than the hydraulic pressure for urging the piston toward the tool holding direction with an increased force.

Abstract: A tool clamping device comprises an axial sleeve having a forwardly tapering internal surface. A radially compressible ring is disposed on the internal surface. An axially compressible spring opposes axial movement of the ring while permitting axial rearward movement of the sleeve whereby the tapering surface of the sleeve compresses the ring radially inwardly into coupling engagement with a groove formed in a tool holder.

Abstract: A rotary chuck for axially clamping a tool includes a spindle terminus forming part of a rotary machine tool spindle; a clamping element holder immobilized in the central bore of the spindle terminus; and a plurality of clamping elements circumferentially evenly distributed about the holder. Each clamping element is a one-armed spreading lever having a first end pivotally supported in the holder to provide for a pivotal movement of each clamping element in a plane containing the spindle axis. Each clamping element has a second end having a radially outwardly swung clamping position in which each second end is adapted to be clamped against an inner shoulder of a hollow tool shank received in the spindle bore for axially pulling the tool into engagement with a frontal end face of the spindle terminus. Each second end has a radially inwardly swung releasing position in which the tool is released from the chuck.

Abstract: In apparatus for driving a spindle of a machine tool, the spindle being rotatably supported in a spindle housing and received in a took mounting opening adapted to be inserted with a pull stud at a front end thereof, including a took clamping drawbar provided with a collet for clamping the pull stud at a front end of the drawbar, and a device for axially moving the drawbar, there is provided a device interposed between the inner surface of the spindle and the outer periphery of the drawbar for transmitting a torque from the drawbar to the spindle. The drawbar is connected to a source of drive of the spindle.

Abstract: A device for locking a tool to a cutting machine. During a locking action a drawbar is rotated to bring a radial lock pin into registry with oppositely directed bayonet slots formed in a tool that has been inserted into a pocket in the end face of a tool holder; a spring acts on the drawbar to move the lock pin into the bayonet slots. The lock pin is carried on a nose element that is threaded onto the drawbar for drawing the lock pin toward the drawbar to achieve an axial lock force between the tool and the tool holder. Tapered frusto-conical surfaces on the tool and holder produce a self-centering tapered sticking lock action. The oppositely directed bayonet slots allow the tool to be forceably dislodged from the sticking taper when the drawbar is rotated in a reverse direction.

Abstract: In a wedge ring mechanism for providing a collet clamping force in a machine tool spindle, a sleeve member retains a plurality of steel balls. A mechanical advantage is realized as the balls are wedged between obliquely inclined surfaces. The sleeve member is provided with a plurality of cylindrical passageways so that positive control over the motion of the balls is maintained at all times during both engagement and release of the collet clamping force, thereby obviating the need to pinch out the balls during release.

Abstract: The actuating arrangement for a tool clamping device (1) has a clamping bar (3) which is axially displaceable in a clamping direction in a machine tool spindle (2) under the effect of a spring arrangement (11) and a firsst wedge transmission assembly (9) which is operable between the spindle and the clamping bar, with freely movable balls which bear respectively against three cone surfaces. They are disposed on a clamping sleeve (13) which is axially displaceable on the clamping bar, on a clamping ring (14) connected to the clamping bar (3), and on a support ring (15) which is arranged stationarily with respect to the spindle. The spring arrangement (11) acts by way of a pressure sleeve (12) which is axially displaceable on the clamping bar.

Abstract: The present invention relates to a system for attaching a tool holder to a machine tool which includes an automatic hook-up of an electrical, pneumatic or hydraulic connector to supply power to the tool holder. The system includes an attaching sleeve slidably mounted on the tool holder mounting stud. A spring interposed between the mounting stud and the attaching sleeve exerts a biasing force on the attaching sleeve. The power connector is separable and has a portion attached to the machine tool and a mating portion movably attached to the tool holder. A pin interconnects the attaching sleeve and the movable mating portion of the connector.

Abstract: In a chuck for axially clamping two machine parts which are releasable from each other, on the first machine part (1) are provided a hollow centring attachment (3), a contact face (6) surrounding the attachment, and an annular groove (8) formed on the inside of the attachment (3) and comprising a groove flank (9) tapering conically towards the free end of the attachment. The second machine part (2) comprises a holding bore (4) which is adapted to the attachment (3) and which is surrounded by an end face (7) against which the contact face (6) can be pressed. In the second machine part are provided several clamping jaws (10) which are each supported by a first end (10a) against a groove flank (12) in the second machine part (2).

Abstract: A tool is to be automatically connected to a robot arm in well-defined angular position such that a sufficiently high torque is transmitted. The robot arm has a conical recess extending over a tool cone. A threaded sleeve is rectilinearly guided in the tool cone and displaceable with respect to a spring. A flange of the threaded sleeve engages an annular shoulder. A threaded spindle extending with a threaded head in a recess is mounted in the robot arm. The threaded spindle first pushes the threaded sleeve back against the action of the spring, such that the spindle engages the threaded sleeve with a well-defined force. Then the threaded head is screwed into the threaded sleeve and through the flange pulls the tool and the robot arm against each other by rectilinear movement. The conical surfaces and of the recess and the tool cone ensure the torque transmission.

Abstract: A tool mounting apparatus for fixedly mounting a tool, an abrasive wheel and the like to a spindle of a machine such as a machine tool, by making use of a resilient means incorporated into the spindle. The resilient means is constituted to create a resilient force by compressing a sealingly enclosed high elastic fluid.

Abstract: A tool clamping device for machine tools comprises a draw bar that is axially displaceable inside a machine spindle and a locking element arranged in cooperation with the draw bar. The device becomes secured to a toolholder by effecting a relative movement between the draw bar and the locking element to effect a lateral displacement of the locking element into locking engagement with a shaft portion of the toolholder. Continued axial movement of the draw bar is transmitted as axial movement to the toolholder.

Abstract: The invention relates to a tool holding system for automatic tool changing in a machine tool, stamping machine or other such machine, wherein the machine has a spindle which has at its free end a gripping means in the form of a sleeve for a tool which can be inserted and removed by a tool changing system, while a draw rod actuating the sleeve by axial displacement is guided in the spindle, and the tool having at the spindle end a tool holding head with an inverted centering frustum cone which can be engaged by a conical inner surface of the sleeve in its clamping position in order to clamp the tool against the spindle.