Abstract: A quick change tool holder of the block tool type wherein a tool nose assembly is releasably secured to a drive member or holder. The tool nose includes a bayonet portion extending axially outward from the rear end thereof which is receivable by an axial opening in a locking assembly housed in the drive member. The bayonet portion is positioned behind a locking ring in the locking assembly, and this locking ring is selectively shiftable axially of the drive member between disengaged and engaged conditions against and under the influence of spring biasing means. In the disengaged condition, the bayonet portion is insertable into and removable from association with the locking assembly. In the engaged condition, the spring biasing means acts against the locking ring to, in turn, act against the bayonet portion for moving the tool nose axially toward the drive member to place teeth on these two components in cooperative engagement to thereby effect a secure interconnection therebetween.

Abstract: A tool (12) is releasably supported on a head (10) by a kinematic support (35) having elements (36,37) provided respectively on the head (10) and the tool (12) and extending in a plane (A--A) transverse to an axis (10A) of the head (10) by a releasable coupling (17) which comprises a first element (21) provided on the head (10) and engaged with a second element (26) provided on the tool. To release the tool (12) from the head (10) the latter is moved to position the tool (12) at a magazine (16) and by such movement to connect the second element (26) with an operating member (41) provided on the magazine (16). Rotation of the second element (26) by the operating member (41) releases the second element (26) from the first element (21) and frees the head (10) for withdrawal in the direction of its axis (10A).

Abstract: A spindle assembly for a metal working lathe includes a generally cylindrical spindle body having a forward end and a rearward end and an internal bore extending longitudinally thereof. An arbor having a forward end connectable to a workpiece is insertable into the bore of the spindle body and has a rearward end provided with a first annular tapered surface. A second annular tapered surface is formed on the arbor at an intermediate position between the forward and rearward ends thereof. The forward end of the spindle body is formed with an interior annular tapered surface configured to seat against the second annular tapered surface of the arbor. A collar member is slidingly insertable within the bore of the spindle body and is formed with an interior annular tapered surface.

Abstract: A tool mounting between a cutting tool, for example a drill, and a machine spindle, comprising a tool element and a tightening device. The tool element consists of a body and an expandable attachment tap. The attachment tap is formed with grooves to receive a gripping implement of a tool interchanging mechanism and with a through opening to receive an end portion of a pull rod. The tightening device comprises a pull rod movably mounted in an inner pipe and forwardly projecting resilient portions. During changing to an other tool the opening at the attachment tap (13) is moved over the end portion by means of the gripping implement while a wall of the opening of the attachment tap slip against the resilient portions until a stop pin on the tool shank engages the end surface of the end portion and the resilient portions snap into recesses in the hole wall.

Abstract: This invention relates to high speed spindles employing a tool holding mechanism which rotates with the spindle. In machining applications utilizing high speed spindles which operate above 20,000 RPM, it is desired to manufacture such spindles so that they maintain their balance. Spindles which employ tool holding mechanisms are required to grasp and release tools between machining operations. Such mechanisms usually employ springs for either holding tools in a collect or returning the release mechanism. This invention discloses two types of springs which are true flexures and are held integral with the spindle shaft. The nature of the design is such that it affords the minimal amount of structural position deviation after each actuation for tool changes, thus minimizing out-of-balance conditions.

Abstract: A composite tool unit comprising a tool shank, a tool head a chuck, a drawbar which is slidable in the longitudinal direction of the tool shank and a pulling shank which projects from the tool head. The drawbar and pulling shank are engaged around by the chuck, which is disposed in the tool shank axially to slide between an opening position and a closure position. The tool shank comprises an inner conical face which tapers in the direction of the drawbar and co-operates with outer conical segments disposed on the clamping jaws. The zones of the drawbar 8 and pulling shank 8 of the tool head engaged around by the chuck have respective projections.

Abstract: A mechanism for retaining tools in the spindle of a machine tool and for ejecting the tools for removal from the spindle. The mechanism is adapted to operate with standard cutting tool holders having a retention knob extending rearwardly and axially. The tool holder is retained in the spindle by a set of locking pins that extend radially through the spindle in a single plane in position to engage the inner side of the knob. A set of release pins of similar construction extend radially through the spindle in another plane in position to engage the outer side of the knob for ejecting the tool holder from its seat in the spindle. A cylindrical cam is slidably disposed about the spindle for axial movement by pneumatic or hydraulic pressure. When the cylindrical cam is moved in one direction it actuates the locking pins inwardly into locking engagement with the retention knob on the tool holders.

Abstract: A tool clamping device for clamping a tool on a main spindle or releasing the same from the main spindle, which includes: a main spindle rotatably supported on a headstock; a push rod extended through the spindle hole of the main spindle so as to be axially slidable, urged rearward by a weak spring and capable of being moved axially for fixing a tool to or releasing the same from the main spindle; a clamping spring for pressing the push rod rearward; a sleeve disposed contiguously with one end of the clamping spring so as to be movable relatively to the push rod; a first interlocking mechanism formed between the push rod and the sleeve so as to interlock the sleeve with the push rod when the sleeve moves in a direction to allow the expansion of the clamping spring and to release the sleeve from the push rod when the sleeve moves in a direction to compress the clamping spring; a second interlocking mechanism capable of being disengaged by the movement of the push rod in a direction to compress the clamping spr

Abstract: A high-speed driving adapter for boring, milling and similar machine tools has a gear housing fixedly connected to a spindle housing of the machine tool. The gear housing rotatably supports a drive shaft having a taper shank disposed in a conical receiving bore in the machine tool spindle. A bearing sleeve is secured to the drive shaft and a tool-receiving spindle is rotatably supported therein and has a conical receiving bore coaxial with the drive shaft for the taper shank of a tool. A sun-and-planet gear arrangement is provided between the drive shaft and tool-receiving spindle. A collet carrier having a center ejecting pin and a collet is axially movable in a coaxial bore in the tool-receiving spindle, the collet having claws which engage an annular groove at an end of the tool taper shank. Several cup springs are arranged concentrically with respect to the collet carrier and urge the collet carrier away from the receiving bore.

Abstract: A tool for a nc machine is provided with a radially displaceable surface slide serving as a tool holder. The tool head is interchangeable by a tool head changing device mounted on the nc machine. The tool head is automatically releasably mounted on the work spindle by means of a clamping cone and a tie rod concentrically disposed within the work spindle and engaging the conical surface of the clamping cone. There is provided a pair of control rods for radially displacing the surface slide and for limiting the radial movement of the surface slide, which control rods are adapted to be automatically separated by releasable clutches for interchanging the tool head (FIG. 1).

Abstract: A tool holder for an industrial robot intended to permit a programmed automatic replacement of tools. The holder and the tool are formed with connecting elements adapted to each other. The holder includes a cylinder housing, in which two pistons, interconnected by a connecting member, are slidably located. This connecting member is formed with a radially oriented, axially elongated opening with two different widths. On either side of the narrower opening part the connecting member is formed with camming surfaces which are inclined relative to an axial plane through the pistons.

Abstract: A chuck which can be clamped into a spindle of a machine tool and which is for use with a cutting tool having a shaft with a circular cross section. The chuck includes a body provided with a central bore having an end region in which the surface of the central bore is conically shaped for receiving the shaft of the cutting tool. The body includes a shaft projecting toward its rear side. The shaft is configured to be clamped into the spindle of the machine tool and is provided with a further bore. A clamping screw is disposed in the further bore of the shaft and has a head which is accessible from the front side of the body. A pull rod is displaceably disposed in the central bore and has a threaded end extending into the end region of the central bore for connection to the shaft of the cutting tool. An attachment mechanism is provided for attaching the pull rod to the clamping screw so that displacement of the clamping screw in the further bore causes displacement of the pull rod in the central bore.

Abstract: An elastomeric sleeve is fitted within a spindle bore over a coaxial spring assembly used to actuate a drawbar clamp. The sleeve takes up the radial clearance space normally provided for the spring assembly, so that as the diameter of the spring assembly changes during compression cycles, the sleeve will be radially compliant and tend to keep the spring assembly centered, thereby minimizing vibrations while the spindle is rotated.

Abstract: A tool holder for use with a mounting system including a spindle having a central frusto-conical bore and a draw bolt positioned centrally in the upper end of the spindle bore. The tool holder includes a central cylindrical main body portion having an annular groove in its upper end; a lower portion extending downwardly from the main body portion and including attachment means for receipt of a suitable tool; and a reduced diameter conical neck portion extending upwardly from the upper end of the main body portion, concentrically within the annular groove, sized to pilot upwardly into the conical bore of the spindle and having a threaded central bore at its upper end threadingly coacting with the lower end of the draw bolt to pull the holder into the spindle.

Abstract: A tool clamping device used with a machine tool is provided for clamping a tool on a tool spindle. In a bore of the tool spindle, there is axially movably received a guide bush which is formed with a recess for permitting steel balls to retract toward radial outward directions. A retainer for holding the steel balls is received in a bore of the guide bush for axial movement relative thereto. The guide bush is connected to a draw bar which is axially movable in the bore of the tool spindle and which is spring-biased toward a rearward direction of the tool spindle. Thus, when the draw bar is spring-drawn toward the rear end of the spindle, the steel balls are restrained from radial outward movements through engagements with the internal surface of the guide bush thereby to clamp the pull stud of the tool.

Abstract: A tool retention mechanism is disclosed for clamping a tool holder knob. An elongate rod member is supported lengthwise in a compartment formed within the center of an elongate housing. A knob clamping assembly is mounted on the outer end of the rod member and is constructed of a circular array of claw fingers that are spring biased to urge them to move radially inward. A first piston is slideably supported on the actuator rod rearwardly of the claw fingers and has a cylindrical collar portion which slides over the claw fingers to retain them in a knob clamping position. A second piston is secured to the inner end portion of the actuator rod and slideably supported in the compartment to define a closed chamber with the inner closed end of the compartment.

Abstract: A device for mounting a turning or milling tool-holder on the slide of a machine-tool, wherein a sleeve is mounted for sliding inside the slide body, said sleeve receiving internally a rotary spindle, and being designed to occupy one position in which it is moved inwards of the body and in which the turning tool-holder is immobilized on the seat of the slide, by means of notchings or serrations, under the action of an axial force exerted by one of the ends of the spindle on the turning tool-holder, and another position in which said sleeve is moved out of the slide body and brought against a centering seat of said body, for which the milling tool-holder is mounted on the end of the spindle which is rotatable under the action of rotating drive means.

Abstract: An automatic draw bar for removably securing machine tools carried by a tool holder within the spindle of a milling machine or the like, in which the tool holder is formed with an internally threaded bore. The spindle is provided with an elongated bore having a recess at its end to receive the shank of the tool holder. A hollow draw bar is slidably carried within the spindle and is exteriorly threaded at one end with a thread engagable with the tool holder interior thread. An elongated draw bar expander slidably carried within the draw bar and responsive to a source of linear power is adapted to couple the threads on the draw bar and tool holder to draw the tool holder into frictional engagement with the spindle upon activation of the power source.

Abstract: A spindle head for a machine tool rotatably carries a tool spindle, which is drivingly connected with an output shaft of a drive motor provided in axial alignment therewith. A drawing bar received in an axial through hole of the tool spindle is urged by means of springs for clamping on the tool spindle a tool being inserted into a front tapered bore of the tool spindle. In order to move the drawing bar against the springs and thereby to unclamp the tool from the tool spindle, an annular cylinder device is provided around the tool spindle. This cylinder device, when supplied with pressurized fluid, moves first and second operating members toward and away from each other in the axial direction of the tool spindle.

Abstract: A high speed motorized spindle is provided with a hollow tool-driving shaft having tool clamping means slidably disposed therein. A piston rod actuates the tool clamping means to slide in one direction to release a tool shank and spring means actuates the tool clamping means to slide in the other direction for gripping the tool shank when the piston rod is withdrawn. The piston rod actuates a collect clamp to clamp the tool-driving shaft against movement from tool unclamping forces when the tool clamping means is slid in the direction to release the tool shank. The tool-driving shaft is releasably oriented in a tool exchange position by a cam plate rotatable therewith being engaged by solenoid actuated cam lock member movably mounted in the housing.

Abstract: A cutting tool assembly comprising a tool holder with a clamping collet and an interchangeable tool insert with a clamping shaft engageable by the clamping collet, matching conical surfaces on the periphery of the tool holder and of the tool insert providing centering as well as axial and radial force transmitting functions, while cooperating spline profiles on the assembly components provide a separate tangential force transmitting function. The clamping collet and the clamping shaft engage each other with multiple conical coupling faces which, under a pulling action of a rod connected to the collet, produce an axial pull on the tool insert while spreading radially between the clamping shaft and the tool holder to produce a radial wedging action. These conical coupling faces may be part of axially spaced identical ridges, the clamping collet expanding radially to clear the ridges for insertion, or they may be flanks of cooperating threads, the clamping collet being rotatable.

Abstract: A method and an apparatus for controlling a radial depth of cut of a rotary cutting tool in a machine tool, in particular in a machining center is disclosed wherein an eccentric mechanism for controlling the radial depth of cut of the tip of the cutting tool is not contained in a main shaft as in a conventional machine tool. Instead, it is provided outside the main shaft, and the radial depth of cut of the tip of the cutter is controlled by a tool holder to be automatically changeably fit to the forward end of the main shaft such that a tool holding shaft mounted to the tool holder by means of an eccentric mechanism so as to have the eccentricity relative thereto be adjustable is adapted to be controlled through a depth of cut central shaft passed through the bore of a draw-bar, concentrically disposed within the bore of the main shaft, by means of a servo-motor through a differential gear mechanism and the eccentric mechanism.

Abstract: A tool holder for boring, milling and the like machine tools has a conical shaft with a support member arranged coaxially on said conical shaft. The conical shaft fits into a conical first receiving bore of the machine tool spindle. The support member has a second conical receiving bore for the conical shaft of a tool. The second conical receiving bore is coaxial with the tool holder conical shaft and is smaller than the first receiving bore of the spindle. The tool holder conical shaft has a coaxial bore, in which is axially movable a collet carrier with a collet. The ends of the collet are constructed as claws and engage an annular groove at the free end of the tool conical shaft. Several axially acting cup-spring packages are arranged in the support member concentrically with respect to the second conical receiving bore. The cup-spring packages act onto the collet carrier through several radially extending support arms for clamping the tool conical shaft in the tool holder.

Abstract: A spindle headstock of a multiple-operation machine tool, whose housing accommodates, in a coaxial and rotatable arrangement, a spindle kinematically coupled to a rotary drive, a tie rod carrying members intended for connection to the shank of a boring head having a swivel carriage, which tie rod is axially adjustable in relation to the spindle, and a bar carrying toothed members for meshing with toothed members mounted on an end of a slide bar whose opposite end serves for radial displacement of the carriage. The bar is kinematically coupled to a drive whereby it is displaced in the axial direction in relation to the spindle. The members of the tie rod, which serve for connection to the shank of the boring head, are mounted on the tie rod so that they can radially reciprocate during location of the tie rod. For radial adjustment of the bar, a bushing is provided on the tie rod, which is axially stationary in relation to the tie rod and kinematically coupled to the spindle and bar.

Abstract: An attachment for fitting a tool to a hollow spindle of a machine tool, in a case where a shank portion of the tool has a taper-size smaller than that of a tapered hole of the spindle, comprises a hollow attachment body to be secured to the lower end of a ram of the machine tool, a sleeve rotatably supported in the attachment body, and an arbor assembly disposed axially movably in the sleeve. The arbor assembly comprises a stud arbor, a pull-stud to be engaged with a collet chuck disposed in the spindle, and a collet chuck to be engaged with a pull-stud of the tool inserted into a tapered hole of the sleeve.

Abstract: A pinless router comprising a router coupled to a movable support arranged and configured such that it has at least one separable portion which may be decoupled from the remainder of the support, a means for vertically moving the router and the support, a helical brush having a large central opening concentric with the router tool and which engages with a work piece when the pinless router is in operation, a means for moving the router together with the support in a horizontal plane, a means for decoupling the separable portion from the remainder of the support and a continuous vacuum applied to the central opening in the brush.In operation, the pinless router is moved downwardly until the brush engages with the surface of the work piece. The routing operation is then substantially performed until just before the routing is completed. The pinless router is then stopped and moved downwardly until the separable portion engages with the work piece.

Abstract: An apparatus and method for installing and removing a tool on a chuck connected to a robot arm. The chuck has a mandrel with two parallel flat sides and two protruding flanges. The tool has a tool coupling member which is supported and held against rotation by a support plate. The tool coupling member is cylindrical and has two lugs spaced apart to allow the flat sides of the mandrel to pass, but to lock over the flanges of the mandrel when the mandrel is rotated relative to the tool coupling member. A cam follower on the chuck follows a guide slot in the support plate to cause the mandrel to rotate relative to the tool coupling member. The cam follower also causes a key on the chuck to mate or disengage a key slot on the tool coupling member.

Abstract: A draw bar for collet chucking spindles having an elongated body with a wrench head, a removable spacer positioned adjacent the head and first and second thread sections at the opposite end of the body, the first section being removed when the threads become worn and the second section being thereby accessible for collet opertion, the spacer being then removed likewise to operate a collet.

Abstract: A collet release device for rotating the draw bar on a milling machine is disclosed. The device includes a pneumatically-driven impact wrench which can be lowered to engage and drive the draw bar in the desired direction. The structure of the device includes a frame which is mounted at the top of the milling machine near the drive head of the draw bar. A carriage, which supports the impact wrench, is slidably mounted on the frame and may be lowered by a pneumatic piston. A single control switch actuates both the impact wrench and the piston. Depressing a first button on the control switch causes the impact wrench to engage the draw bar and rotate in a first direction, while depressing a second button causes the wrench to engage the draw bar and rotate in the opposite direction.

Abstract: A boring tool is disclosed capable of positioning a tool element between a radial cutting position and a radial retracted position out of contact with the finished workpiece bore to avoid tool mark formation on the finished bore during tool withdrawal. The boring tool is simple and low cost in construction and includes a resilient tool-carrying member which extends transversely of the spindle axis in cantilever fashion for deflection by a spindle draw bar relative to a stop means on a fixed support member attachable to the spindle. During boring, the tool-carrying member is in deflecting engagement with the drawbar and, in conjunction with stop means, positions the tool thereon in a radial cutting position. For tool withdrawal, deflecting engagement is released so that the resiliency of the tool-carrying member positions the tool in a radial retracted position out of contact with the finished workpiece bore.

Abstract: A tool holder clamping and unclamping device utilizes a special combination of a Belleville spring biased bolt threading device to actuate a ball detent mechanism to lock a tool holder in the device.

Abstract: A vertical milling and turning machine generally comprises a spindle assembly connected to a drive motor. The spindle assembly comprises a hollow ram provided with a tapered opening at the front end thereof for attaching a turning tool and a hollow spindle provided with a tapered opening coaxial with the former opening at the front end of the spindle and the tapered opening of the spindle has a diameter smaller than that of the later opening. An air supply passage is formed in the ram so as to have an end opening opened towards the tapered opening of the ram and a detecting switch for detecting a pressure in the passage is connected to the air supply passage.

Abstract: An attachment for a vertical milling machine or the like provides a drive arrangement which provides for a selective high-torque drive connection, a low-torque yielding drive connection, or a complete disconnect.

Abstract: The present invention relates to a multi-purpose tool having particular, although not exclusive, use in conjunction with milling machines in which a drawbar is employed to engage and disengage a tool collet wherein the drawbar protrudes above the machine tool and is rotatable to release and secure the collet. The tool of the present invention combines a socket wrench for rotating the drawbar and a mallet for tapping the bar to free up the collet taper. The tool is dynamically balanced about the axis of the center of mass which is fitted to the protruding end of the drawbar. A handle is provided which is extendable to increase the torque or leverage available to the user and the handle itself is weighted to take advantage of centrifugal force to urge the handle towards its retracted position. A beveled pin or wedge device is also provided to inhibit the lowering of the drawbar with the tool still engaged with the protruding end.

Abstract: A mechanical gripping device for rotating jaw chucks or collet chucks. With the known gripping devices, rotationally symmetrical parts can be gripped in a rotating jaw chuck or collet chuck either only from the outside or only from the inside. The invention is based upon the problem of creating a mechanical gripping device for inside and outside gripping. With the invention, in a bore hole of a spindle two axially displaceable disk-shaped spring plates are arranged which are pressed into respective end positions by springs arranged between them. Centrally to the disk-shaped spring plates a slide is arranged which is selectively coupleable with one of the two spring plates.

Abstract: A clamping or chucking apparatus for a shaper cutter for a gear shaping machine, especially a generating shaping machine for fabricating gears, containing an axially to-and-fro movable ram spindle and a shaper cutter holder affixed at one end of the ram spindle and having a contact surface for the shaper cutter. A centering projection protrudes axially away from the contact surface and serves for mounting the shaper cutter. A clamping plate is attached at the end of the centering projection over a clamping mandrel or plug. The coaction of the clamping plate and clamping mandrel serves to clamp the shaper cutter against the contact surface of the shaper cutter holder. The ram spindle is hollow and contains a spring arrangement and a piston. The spring arrangement is prestressed in order to exert an axial clamping force and is operatively connected by a coupling with the shaper cutter holder or shaper cutter.

Abstract: The spindle of a machine tool has a drawbar disposed therein for threaded engagement into and out of the toolholder inserted into the spindle bore to releaseably secure the toolholder within the spindle. Splined on the rearward end of the drawbar distal from the spindle is a spur gear which is shiftable into and out of engagement with a cluster gear driven by the spindle drive motor. When the spur gear on the rearward drawbar end is shifted into engagement with the cluster gear driven by the spindle drive motor, the drawbar will be rotatably threaded either into or out of the toolholder shank by the spindle drive motor and thus, the need for a separate motor to rotatably drive the drawbar is eliminated.

Abstract: An apparatus for chucking and releasing a conical shank of a tool or an additional aggregate on tool machines, particularly drilling and milling machines. The apparatus has a hollow spindle which is supported in a spindle housing and has at its lower end which faces the conical shank a receiving cone for the shank. A draw rod is supported for axial movement limited by a lower and an upper stop, is rotatably movable in the spindle, has at its end which faces the shank threads which can be screwed into threads on the shank, and is connected at its upper end to a drive motor rotor so as to be fixed against rotation but axially movable with respect thereto. Both stops are provided on a sleeve which concentrically surrounds the draw rod. The sleeve is supported on a spring arrangement. It is movable axially downwardly with respect to the spindle under the action of a hydraulically operated piston against the chucking force of the spring arrangement in a direction toward the receiving cone.

Abstract: A chuck has a chuck body adapted to be rotated about an axis and formed centered on the axis with a forwardly open tool-receiving seat. A holding element is displaceable axially in the body between a rear holding position securing a tool in the seat and a front releasing position permitting the tool to be inserted backwardly into and withdrawn forwardly from the seat, with a holding spring urging the element backwardly into the holding position. A piston axially coupled to the holding element has an axially backwardly directed piston face exposed in a chamber formed between this axially backwardly directed face and the forwardly directed face of an actuating member that is urged axially forwardly by a locking spring. A plurality of locking balls are displaceable radially but not axially in the chuck between radially inner locking positions engaged in a groove in the piston and radially outer positions engaged in a groove in the actuating member.

Abstract: A machine tool with an automatic tool change function wherein a rotatable tool spindle carries a movable key engageable with either of a pair of key-ways formed on a tool. A tool changing arm, serving as a tool support device, friction-rotatably supports at least one tool for being selectively inserted within and removed from the tool spindle. When tool changing operation is to be performed, rotation of the spindle is changed to a predetermined speed permitting key-engagement. A first confirming device is provided for confirming the fact that the spindle has reached a first predetermined position during rotation thereof. The tool change arm is then operated to remove the tool from the spindle in response to the first confirming device. A second confirming device is provided for confirming that the spindle has reached a second predetermined position during rotation thereof.

Abstract: Pressurized hydraulic fluid for energizing the collet unclamping mechanism of a machining center is supplied through a first solenoid valve from an accumulator which is charged by a piston pump. The piston pump is attached to the machining center between the Z axis slide and the Z bed so that as the Z axis slide is moved to a home position at the outset of a tool change cycle, the pump charges the accumulator, allowing pressurized hydraulic fluid to be admitted into the collet unclamping cylinder through the solenoid control valve in response to machining center control system commands. Following pressurization of the unclamping mechanism from the accumulator, both the unclamping mechanism and the piston pump drain to the oil sump to reduce any drag on the Z axis slide or on the unclamping mechanism itself.

Abstract: A contact detecting apparatus for detecting the contact between a workpiece and a tool in a machine tool which includes a coil mounted on a spindle head and connected to an AC power source for generating an induced current in a looped secondary circuit including the workpiece, a work table, a machine body, a spindle head, a brush, a clamp bar for clamping the tool on a tool spindle, springs interposed between the spindle and the clamp bar, the tool spindle and the tool, when the workpiece and the tool are moved relatively into contact with each other. The brush is kept contact with the clamp bar at the rotational axis of the tool spindle. A detector is connected between the AC power source and the coil for detecting a change in an electric signal caused by the contact between the workpiece and the tool.

Abstract: A pneumatically powered spindle wrench is disposed and engaged atop the upper terminus of the powered vertical spindle of the vertical milling machine. The powered spindle wrench has a socket shaped and sized to engage the drawbar of the upper spindle terminus on signal. The tool holder is secured in and engaged in the spindle tapered aperture at the lower spindle terminus. On pneumatically powering and rotating the upper drawbar terminus of the spindle, the drawbar is unlocked and the tool holder can be removed from the spindle lower terminus. An electrically powered D.C. motor, and a hydraulically powered motor can also be equivalently substituted for the pneumatic motor drive.

Abstract: In a machine tool with an automatic tool change function, a rotatable tool spindle carries a movable key engageable with a key-way formed on a tool. A tool changing arm, serving as a tool support device, friction-rotatably supports at least one tool for selectively inserting and removing same into and from the tool spindle. When a tool change operation is to be performed, rotation of the spindle is changed into a predetermined speed permitting key-engagement. A detecting device is provided for detecting movement of the movable key to confirm engagement of the movable key with the key-way of the tool. A clamp device clamps the tool inserted into the spindle in response to the detecting device. After the tool is clamped on the spindle, rotation of the spindle is changed into a machining speed. A confirming device is provided for confirming that the spindle is reached at a predetermined angular position during rotation thereof.

Abstract: A tool fastening device comprises a drawbar (21, 22; 47, 48) for clamping a tool holder (10; 40) to a spindle (11; 41) of a machine tool by frictional engagement with a conical bore therein. The drawbar is connected to the tool holder by radially expansible locking means (23; 50) on the drawbar. The locking means is actuated by means of an expansion rod (28; 52). For purposes of facilitating the operation of the expansion rod there is provided forcing means (30; 57) which continuously forces the expansion rod toward the tool holder.

Abstract: In a draw-bar mechanism for moving the collet of a chuck or the like on a spindle of an automatic turning machine toward its axial clamping position and for thereafter closing the collet more slowly with greater force about a tool or workpiece to be clamped, motion is transmitted from an actuating sleeve to a draw bar or like control member by spherical thrust members movably confined between three faces obliquely inclined relative to each other. A first face is fixed relative to the spindle assembly and has one section parallel to the axis and another axially contiguous section obliquely inclined relative to the axis, the two sections merging in an exposed edge. A second face is fixed relative to the control member, and the third face is fixed relative to the actuating sleeve and has two axially consecutive sections obliquely inclined relative to each other.

Abstract: A spindle extension, especially for drilling and milling machines, is required when machining large size workpieces. In order to enable the automatic tool change also when there is mounted the spindle extension with the available tools, the inventive spindle extension is provided with a chucking clamp which possesses a chucking or clamping pin which can be engaged by the chucking clamp of the tool spindle.

Abstract: A milling machine includes a C-shaped frame, tool support member movable in a vertical direction, a saddle member movable in a transverse direction, a work table movable in a longitudinal direction, a tool drive unit, a tool knock-out assembly and two oppositely positioned and removable bearing ways associated with each direction of travel. For the vertical axis the bearing ways are between the C-shaped frame and the tool support member. The tool drive unit includes a hollow tool spindle and a drive motor with a vertically extending output shaft which is rigidly and coaxially connected to the hollow tool spindle. The tool knock-out assembly includes a spring-loaded tool collet assembly and a double-action air cylinder arranged in a surrounding coaxial relationship with the output shaft.

Abstract: A power drawfinger system for selectively locking and releasing a toolholder or arbor in the socket of a power driven machine tool spindle. The system includes a collet device actuated by a power drawbolt using hydraulic means for expanding said device and a resilient member for contracting same to disengage or engage the toolholder. The collet device and drawbar mechanisms are constructed to be fail safe in event of breakage of the collet or loss of power.

Abstract: A machine tool comprises a table mounted on a bed and adapted to be moved in the direction of longitudinal axis of the bed, said table being arranged to be driven or rotated, intermittently indexed and controlled of the turning position thereof; vertical columns installed in a plane extending at right angles to the bed and having vertically sliding rails or vertical slides; a cross rail mounted on said vertical slides so as to be slidably moved in the vertical direction; a saddle mounted on said cross rail so as to be slidably moved in the horizontal direction; said saddle being arranged to slidably move the ram means in a direction at right angles to said cross rail; said ram means having a lower end face on which a turning tool can be fixedly mounted; said ram means having in the front face or the side of the lower end thereof a turret head adapted to be rotated and indexed in a plane extending at right angles to said table face, said turret head having a main spindle which is adapted to be rotated or drive