Abstract: The present disclosure provides a spindle structure including a base, a spindle, a sliding member, a restoring mechanism, and a restriction member. The spindle is rotatably received in the base and forms a receiving room. An end of the receiving room is a blind end communicating exterior via a gas channel. The sliding member is slidably received in the receiving room, and two ends thereof are a piston and a driving portion respectively. A gas cavity is defined between the piston and the blind end. The sliding member tends to move toward the blind end due to the restoring mechanism. The restriction member is connected to the driving portion and radially deforms when the sliding member slides so as to fix or to release the tool-holder. The sliding member slides outward when the gas cavity is injected with gas via the gas channel.

Abstract: A blocking device (1) for a fan that blocks a direction of rotation of a rotor (70), via which a wheel of the fan can be driven. The blocking device has a bearing tube (10), a rotor shaft (60) and a freewheel sleeve (50). The freewheel sleeve (50) is accommodated in the bearing tube (10) and is connected to the rotor shaft (60), which extends through the freewheel sleeve (50), for conjoint rotation. The freewheel sleeve (50) blocks rotation of the rotor shaft (60) at least in relation to the bearing tube (10) in the direction of rotation of the rotor.

Abstract: A rotation brake for stopping rotation of a spindle assembly on a horizontal directional drill. The rotation brake comprises a brake lock that is actuated by a cylinder and spring to interact with a non-rotating brake cap and a rotating pinion, thereby stopping rotation of the pinion. The brake lock is removed from the pinion by applying pressurized fluid to a cylinder such that a cylinder rod moves the brake lock out of a cavity between the brake cap and the pinion. Upon removing fluid pressure from the cylinder, a compressed spring moves the brake lock back to into the cavity, preventing rotation.

Abstract: A machine tool includes: a column; a spindle head supported by the column; a spindle in the spindle head; a draw bar moved upward to clamp a tool to the lower end portion of the spindle and moved downward to release the tool therefrom; a biasing portion biasing the draw bar upward; a cam mechanism including a cam in the column and an arm whose one end slides on a cam surface such that the other end pushes down the draw bar; a measurement portion measuring the position of the draw bar; a storage portion storing a position relationship between the spindle head and the draw bar when the cam mechanism is normal; and an abnormality determination portion determining an abnormality in the cam mechanism based on the position of the draw bar measured with the measurement portion and the relationship stored in the storage portion.

Abstract: A main spindle device includes: a main spindle; a rod accommodated in the main spindle, the rod being capable of moving to an unclamp position in a direction toward the first end, and when the main spindle is holding a tool, being capable of moving to a clamp position in a direction toward a second end; a biasing unit that biases the rod in the direction toward the second end with respect to the main spindle and that biases the rod to the clamp position when a collet is holding the tool; and a biasing force detector that detects a biasing force of the biasing unit which biases the rod in the direction toward the second end after the rod is moved in the direction toward the first end with respect to the main spindle to the unclamp position by force larger than the biasing force of the biasing unit.

Abstract: A servo-driven tool unclamping system for a machine tool contains: a tool changing unit, a tool unclamp unit, and a servo control unit. The tool changing unit includes a cam box, a first servo motor for driving the cam box, a driving shaft driven by the cam box, and a tool change arm driven by the driving shaft. The tool unclamp unit includes a spindle, a transmission assembly, and a second servo motor. The servo control unit includes a main controller, a first servo drive and a second servo drive both electrically connected with and controlled by the main controller. The first servo drive and the second servo drive are also electrically coupled with the first servo motor and the second servo motor and numerically control the tool changing unit and the tool unclamp unit, hence the tool change arm operates, and the spindle clamps and unclamps each tool.

Abstract: A first coupling part interacts with a second coupling part of a tool coupling. The first coupling part has a first body and a conical pin, which extends from the first body along a center axis (x) to an end surface. The conical pin is insertable into a conical seat. The conical pin comprises a cavity, which extends from the end surface and comprises a number of first protuberances, which are separated and arranged at a distance from each other along a circumferential direction in respect to the center axis so that there are formed a corresponding number of first recesses. The first protuberances form a respective first contact surface and interact with a corresponding number of separated, second contact surfaces of a pull member of the second coupling part. The first contact surfaces form an acute angle with the center axis.

Abstract: Disclosed is a spindle device (5) for a machine tool such that draw bar (22) is inserted into spindle (20) which is rotatably supported in housing (12), and draw bar (22) is biased to a rear of spindle (20) by an elastic force of disc springs (23), resulting in tool holder (51) being clamped to spindle (20). Spindle device (5) is equipped with unclamping device (60) that comprises piston (63) which is provided in annular space (55) between spindle (20) and draw bar (22), and which, by means of fluid pressure, causes draw bar (22) to move toward the front of spindle (20) in resistance to the elastic force.

Abstract: A device and method for measuring the clamping force a machine tool exerts on a tool holder that includes a piston or cylinder body defining a bore that slidably receives a piston. A fluid filled pressure chamber is defined between the piston and the body and a pressure gauge carried by the piston communicates with the pressure chamber such that movement in the piston in at least one direction exerts compressive forces on the fluid in the pressure chamber which is communicated to the pressure gauge. A retention knob is coupled to the piston and is engageable by the machine tool such that the clamping force exerted by the machine tool is transmitted to the piston. Hex-shaped structure on the piston that is received by a complementally formed recess in the cylinder body inhibits relative rotation between the piston and the body and facilitates installation and removal of the retention knob.

Abstract: There is provided an attachment structure for a main spindle and a tool holder of a machine tool. The tool holder is attached to the main spindle by a tapered shank portion of the tool holder being inserted into a tapered hole formed in the main spindle of the machine tool. At least one circumferential groove is formed in at least one of the tapered hole and an inner wall of the main spindle.

Abstract: An arrangement for sealing a pressurized coolant system for a drawbar cylinder rod and a spindle drawbar in a machine tool utilizes a stationary mounting plate for supporting a piston plate and a drawbar cylinder rod. A pulley is mounted on the spindle for driving the spindle and a rotary seal that rotates with the spindle is mounted to the spindle. A non-rotating seal is mounted on the mounting plate. A planar sealing surface is formed by the contact between the non-rotating seal and the rotary seal, whereby a reliable fluid seal is formed between the rotating and the non-rotating structures of the pressurized coolant system.

Abstract: According to a tool clamping device for a machine tool, when a draw bar is moved in the axial direction of the main shaft of the tool clamping device, a steel ball moves in the radial direction of the main shaft so as to press the inner wall of the main shaft, forming an impression on the inner wall of the main shaft. This forms an inclined surface for generating a magnification effect for magnifying a spring force.

Abstract: The damping property of a rear rolling bearing (133) is adjusted by controlling a damping force that is applied by damping application means (5, 134) based on, for example, the type of a tool (T). Thus, it is possible to provide the optimum damping properties for various tools that differ in natural vibration, and to suppress the generation of chattering of the various tools. As a result, it is possible to increase the cut amount per unit time to increase the productivity.

Abstract: A spindle attachment includes a device body having an attachment surface detachably attached to an end face of a spindle head. Fixed and movable teeth move the body in a direction of an axial line of the spindle to engage the spindle head and the body so as to freely restrict or release rotation of the body with respect to the spindle head. A coil spring urges the body so that the attachment surface is pressed onto the end face of the spindle head with the fixed and movable teeth ready for engagement. A pressure cylinder causes fluid pressure to act on the attachment surface against the spring force to release engagement between the fixed and movable teeth. A key and a key groove transmit rotation of the spindle to the body with the fluid pressure of the cylinder acting on the attachment surface of the device body.

Abstract: A shaping machine system including a shaping device and a computer is provided. The shaping device includes at least one jig mount body configured for mounting a jig; a shaping tool support body configured for supporting a shaping tool; a first drive device configured for rotating the shaping tool; and a second drive device configured for driving the shaping tool support body or the at least one jig mount body or changing a posture of the shaping tool relative to the workpiece. The computer is configured for controlling the first and second drive devices according to predetermined shaping data. The computer includes a jig position measuring unit configured for measuring a position of the jig; a position error detecting unit configured for detecting a position error of the jig, and a shaping data correcting unit configured for correcting the predetermined shaping data according to a jig position error.

Abstract: A toolholder support member for retaining the shank of a toolholder has a bore to accept the toolholder shank. A retention member extends through the bore wall to engage a perforation extending through the shank or indentation within the shank, thereby retaining the shank within the receiving bore. The retention member is biased to provide resistance for insertion or extraction of the shank within the receiving bore. Furthermore, the retention bore is angled relative to the longitudinal axis of the receiving bore so that the force required to insert the toolholder within the receiving bore is minimized, while the force required to extract the toolholder from the receiving bore is maximized.

Abstract: In the case of a tool clamping device, in particular, for an operating spindle of a processing machine, with an activation element (3) that can be moved by a drive between a first position, in which the tool clamping device is located in a clamped position, and a second position, in which the tool clamping device is located in a released position, a sensor is present in the form of at least one electrical component for detecting a position of the activation element (3). The sensor is integrated structurally into the tool clamping device and at least one section of the activation element (3) directly forms a component of the one or more electrical components, wherein its position influences an electrical property of this component. The component can be an electrical switch whose closed state depends on the position of the activation element (3) in that at least one section of the activation element (3) is electrically conductive and forms a contact electrode of the switch or a part of such an electrode.

Abstract: A shaft cooler (1) for a tool motor spindle (2), which has a rotating shaft (3), a static lance (4), and at least one coolant loop (7), which comprises a coolant inlet (5) and a coolant outlet (6), said shaft cooler being implemented such that the flow of the coolant from the static lance (4) into the rotating shaft (3) is performed via a flow path that includes radially-extending cooling holes (31) to cause the coolant to flow from a radially inside location to a radially outside location.

Abstract: A spindle assembly useful at high rotational speeds including a tool holding and releasing collet mechanism operated by an axially movable drawbar held in its tool holding position by a spring the force of which is overcome by a piston movable between first and second positions. A plurality of arms pivotally secured at one end thereof to a housing with a second end thereof engaging said piston and having a cam surface intermediate the first and second ends thereof engaging an actuator positioned to engage said drawbar, overcome said spring and move the collet mechanism to its tool releasing position. The ratio of the distance between the pivot point and cam surface with respect to the distance between the pivot point and the second end thereof being such to magnify the force of the piston sufficient to overcome the spring force.

Abstract: The invention relates to a spindle, in particular a machine spindle, which is used to machine a work piece by means of a tool which is applied to the spindle, comprising an axially displaceable tension rod (30) which is used to secure the tool to the spindle, and a drive shaft (4) which is driven, in particular, by the motor of the spindle. The drive shaft of the spindle can be connected via a coupling device either to the tension rod (30) for axially displacing the tension rod (30) in order to change tools or to the tool in order to machine the work piece. The tension rod (30) can be axially displaced in a work shaft (1) which is embodied as a hollow shaft. The work shaft (1) can be arrested in relation to the housing (2) of the spindle in a first coupling position in order to axially displace the tension rod (30) within the work shaft (1) by the drive shaft (4). The angle position of the work shaft (1) and the drive shaft (4) can be freely selected in the first coupling position.

Abstract: A spindle device of machine tool includes a pressure sensor (31) that detects a pressing force to a rod (18) by a drive (25), a displacement sensor (32) that detects displacement of the rod (18), a tool clamping-force detector (33) that detects a clamping force to a tool (19) by a collet (20) based on the pressing force to the rod (18) and the displacement of the rod (18), and a spring-replacement-timing determining unit (36) that determines a replacement timing of disc springs (24) based on the tool clamping force and a preset biasing force characteristic value of the disc springs (24), thereby allowing highly accurate determination of a replacement timing of a biasing unit by appropriately detecting a tool clamping force.

Abstract: A chuck for a tubular body having a noncircular outer surface and an interior formed with a gripping formation has a spindle extending along an axis, axially displaceable claws in the spindle each having a pair of opposite ends, and a gripper head engageable with one of the ends of each of the claws in the spindle. This head is displaceable between a holding position in which the claws engage the gripping formation in the tubular-body interior and an open position disengaged from the gripping formation. The jaws move on displacement between the open position and the holding position by engagement of the gripper head with their one ends in a first pivotal movement and then at their other ends in a second pivotal movement to press their other ends against the working spindle.

Abstract: A motor-driven working spindle for a machine tool has a casing in which a shaft is mounted for rotation. The shaft has a receptacle for a tool arranged at its front end. A spindle rotary drive is provided in the casing. Furthermore, a spindle advancing drive coupled with the shaft is provided in the casing.

Abstract: A tool unclamping device is a device capable of unclamping a tool clamped to a spindle of a machine tool, and comprises a casing, an output shaft set on this casing and capable of outputting power necessary for unclamping the tool, a motor serving as a power source capable of supplying power for driving the output shaft, a power transmission mechanism transmitting the power from the motor to the output shaft and a gas cylinder serving as an auxiliary power source capable of supplying auxiliary power to this power transmission mechanism.

Abstract: A device for clamping a stem has a body forming a piston chamber and having an axially outwardly open hole adapted to receive the stem and a plurality of collet jaws in the hole shiftable axially by a piston between an outer releasing position with its axial outer ends radially spread and an inner holding position with the ends more closely radially juxtaposed. The stem is engageable axially in the hole between the jaws and lockable in the body in the inner holding position. A main spring urges the piston and jaws axially inward into the inner position. A cover element has an outer head and is axially shiftable relative to the piston between an extended position with the head engaged radially between the outer ends of the jaws and a retracted position with the head spaced axially inward from the outer ends of the jaws.

Abstract: A machine-tool spindle device includes: a spindle; a front housing for rotatably supporting the spindle; a first drive motor having a first rotor installed securely on the spindle and a first stator installed securely within the front housing; a rear housing installed on a rear end side of the spindle in the front housing; a second drive motor having an annular second rotor which is disposed coaxially to the spindle near a rear end of the spindle and which is supported rotatably within the rear housing, and a second stator installed securely within the rear housing; a connecting mechanism for connecting the rear end of the spindle and the second rotor and releasing the connection; and a clamping mechanism, disposed within the attaching hole of the spindle and within the second rotor, for clamping a tool attached to the spindle.

Abstract: A spindle head device (10) includes a spindle (12) and a tool retaining mechanism (16) detachably retaining a tool holder (14) on the spindle. The tool retaining mechanism includes a tool support member (52) having a receiving recess (50) detachably receiving the shank (46) of the tool holder, a tool clamp member (54) disposed to be displaceable with respect to the tool support member between an operative position and an inoperative position, and a mounting member (56) detachably mounting the tool support member and the tool clamp member to the spindle. The tool clamp member grips the shank of the tool holder and fixedly holds the shank to the receiving recess of the tool support member at an operative position, and, at an inoperative position, releases the shank to allow the tool holder to be attached or detached to or from the receiving recess.

Abstract: An ID tag (27) is attached to a bottom surface (31) of a hollow portion (17) of a tool holder (11) having a hollow taper shank. Concretely, a circular recess (33) is formed on bottom surface (31) of hollow portion (17), and ID tag (27) is attached in recess (33) by means of adhesive or the like. The center of circular recess (33) coincides with a rotation axis of tool holder (11).

Abstract: A shaping machine system is presented. The shaping machine system includes a shaping device including at least one jig mount body for mounting a jig for supporting a workpiece, a shaping tool support body for supporting a shaping tool for shaping the workpiece, a first drive device for rotating the shaping tool, and a second drive device for driving at least one of the shaping tool support body, the jig mount body, or to change a posture of the shaping tool relative to the workpiece. The shaping machine system also includes a computer including an input unit for receiving a jig selection, a shaping tool selection, a shape data reading unit for reading shape data representing a shape of the workpiece after shaping, a shaping data producing unit for producing shaping data for controlling the first and the second drive devices.

Abstract: Disclosed is a spindle device (5) for a machine tool such that draw bar (22) is inserted into spindle (20) which is rotatably supported in housing (12), and draw bar (22) is biased to a rear of spindle (20) by an elastic force of disc springs (23), resulting in tool holder (51) being clamped to spindle (20). Spindle device (5) is equipped with unclamping device (60) that comprises piston (63) which is provided in annular space (55) between spindle (20) and draw bar (22), and which, by means of fluid pressure, causes draw bar (22) to move toward the front of spindle (20) in resistance to the elastic force.

Abstract: The invention relates to a method for operating an actuation device (20), which is used to clamp and loosen a clamping device which comprises a tie bolt which can be adjusted in an axial manner in a machine spindle (3), for actuating a clamping head (6) which co-operates with clamping claws (5). Initially, force is exerted upon the tie bolt (4) by means of an actuation device (20) which is used to clamp in an axial clamping direction, until the axial length thereof is fixed in relation to the machine spindle (3) by means of self-locking. According to the invention, after self-locking is obtained, the effect of the force in the direction of clamping of the actuation element (20) on the tie bolt is stopped and remains blocked while the clamping device is being used, and to release clamping, the tie bolt (4) is displaced by the actuation device (20) in the direction of release which is counter to the clamping direction. The invention relates to a device for carrying out said method.

Abstract: An improved shuck has one end coupling with a fabrication machine through a holding member. The chuck includes a coupling structure, a grip means and a shank. The coupling structure has a first screwing portion at one end and a fastening member at the other end. The grip means has a second screwing portion at one end engageable with the first screwing portion and a plurality of grip jaws at the other end inclined outwards. The coupling structure and the grip means are held in a through hole formed in the shank. The through hole has an internal side to form compact holding of the grip means to firmly hold a tool. After the coupling structure is anchored through the fastening member, the shank can be turned to drive the grip means to move, and the grip jaws can be expanded or contracted to release or grip the tool.

Abstract: The invention relates to an apparatus for holding a workpiece (2) or tool having a tapered collar (1) or the like and having a pull-back rod (4) axially shiftable in a body (3) for actuating a chuck head (6) cooperating with jaws (5). The axial position of the pull-back rod (4) is maintained in a holding position without utilizing the force of a tension spring by a self-locking mechanism.

Abstract: Systems and methods include using a pull stud bolt for connecting a tool holder to a collet in a spindle. The pull stud bolt includes a body configured to receive a tool holder, the body having a longitudinal passage fluidly connected to a cavity, the cavity fluidly connected to a plurality of longitudinal channels; a sealing ring disposed around an end of the longitudinal passage, the sealing ring in contact with the cavity; a spring disposed in the cavity; and a sphere in contact with the spring. The sphere is configured to unblock the end of the longitudinal passage by losing contact with the sealing ring when a first force applied to the sphere from the spring is less than a second force applied by a fluid flowing through the longitudinal passage. The first and second forces are substantially opposite in direction of application.

Abstract: A quill style drilling/milling end effector with high tool positioning accuracy, a pressure foot with fast response in force and displacement feedback, and with automatic mounting and dismounting, normality sensing, and through the tool coolant delivery.

Abstract: It is an object to provide a spindle device of a machine tool which has a simple structure and is capable of having high suction efficiency of cutting chips. A draw bar bringing engaging claws into engagement with a tool holder or releasing the engagement includes an engagement drive part moving the engaging claws to an engagement position with the tool holder; and a draw bar main body connected to the engagement drive part, and the engagement drive part is inserted into the draw bar main body to be detachably connected to an inner surface of the draw bar main body.

Abstract: The invention relates to a spindle for a machine tool, in particular a motor spindle having a housing (2) for accommodating an electric motor (3) and a shaft (6) which can be driven by the latter, in particular having a tool holder for a tool for machining workpieces, wherein at least one data acquisition element (8) for recording operating and/or state data of the spindle is provided, and wherein the data acquisition element is in the form of a radio chip and can be read by radio using a read element (9).

Abstract: The invention relates to a clamping device for removably mounting a tool (3) or a tool fixture in a receiving part (1). Said clamping device comprises several pincers elements (33) which are concentrically arranged around a central axis (32) within the receiving part (1) and are impinged upon by a tension spring (39) so as to be moved into a clamping position in order to brace the tool (3) or the tool fixture. In order to be able to automatically replace a tool without using much force and energy, an axially movable closing element (17) is assigned to the pincers elements (33). Said closing element (17) impinges the pincers elements (33) in a forward position that is advanced in the direction of the pincers elements (33) for mounting purposes in the clamping position thereof, which is swiveled inward by means of the tension spring (39), while being movable into a retracted position with the aid of a detaching device (12, 16, 45, 46, 47) in order to release the pincers elements (3).

Abstract: A machine tool including a bed; a work table horizontally movable on the bed; a column extending from the bed; a spindle head movable on the column; an outer cylinder attached inside the spindle head; a stator of a built-in motor; and a spindle sub-cartridge. The spindle sub-cartridge includes a vertical rotating shaft; a front side bearing having an inner ring fitted to a front end of the rotating shaft and an outer ring fitted to a front housing; a rotor of the built-in motor; a rear side bearing having an inner ring fitted to a rear end of the rotating shaft and an outer ring fitted to a bearing sleeve. The movable range of the spindle head in the vertical direction is longer than a length necessary for inserting the spindle sub-cartridge into the spindle head. The spindle sub-cartridge is can be disassembled and assembled integrally with respect to the spindle head.

Abstract: A bearing unit capable of withstanding a large axial force based on a simple structure including: a bearing 10 having an internal ring 13 fitted to an inside member 2, an outer ring 14 fitted to an outside member 6, lots of rolling elements 15 disposed between the outer ring 14 and the inner ring 13; and a transmitting direction shifting means A transmitting an axial force F from the inner ring 13 to the outside member 6 when the axial force F transmitted from the inside member 2 to the internal ring 13 exceeds a predetermined value or above, and a main spindle device of a machine tool, which is provided with the bearing unit, are provided.

Abstract: A spindle assembly useful at high rotational speeds including a tool holding and releasing collet mechanism operated by an axially movable drawbar held in its tool holding position by a spring the force of which is overcome by a piston movable between first and second positions. A plurality of arms pivotally secured at one end thereof to a housing with a second end thereof engaging said piston and having a cam surface intermediate the first and second ends thereof engaging an actuator positioned to engage said drawbar, overcome said spring and move the collet mechanism to its tool releasing position. The ratio of the distance between the pivot point and cam surface with respect to the distance between the pivot point and the second end thereof being such to magnify the force of the piston sufficient to overcome the spring force.

Abstract: The present invention provides a cartridge-type spindle device having an easily separable structure despite the fact that it comprises a rotary joint for a through spindle coolant device. In the cartridge replacement type spindle device (11), front bearings of the spindle are built in a front housing (23) and rear bearings of the spindle (15) are supported on a rear housing (25) so that, when the front housing (23) is separated from the rear housing (25), the front bearings (17a, 17b), the spindle (15), and the rear bearings (19a, 19b) can be separated from the rear housing (25) integrally with the front housing (23). The rotary joint is disposed in a piston (63) of an unclamp means for unclamping a tool (21, T) mounted to the forward end of the spindle (15), so that a draw bar (51) accompanied by a seal ring can be separated from the rear housing (25) and the rotary joint together with the spindle (15) and the front housing (23).

Abstract: The invention provides an improved seal structure of cutting fluid supplied to a spindle of a milling spindle. The milling spindle 100 comprises a spindle 20 supported within a housing via a bearing 16, and a drawbar 24 having a through coolant passage 22. The cutting fluid C1 passing through the rotary joint 40 and 50 is sent to the through coolant passage 22, but a portion thereof is collected in a drain chamber 105. A rotation member 110 is attached to a rear end portion of the spindle 20, which is equipped with a labyrinth device 150 having a lip seal member 152. An air supply member 120 has two air seal members 142 and 144, and air A1 is sent toward the labyrinth device 150, by which an air seal is formed.

Abstract: The invention provides an improved drain structure of a cutting fluid supplied to a spindle of a milling spindle. The milling spindle 100 comprises a spindle 20 supported within a housing via a bearing 16, and a drawbar 24 having a through coolant passage 22. The cutting fluid C1 passing through the rotary joint 40 and 50 is sent to the through coolant passage 22, but a portion thereof is collected in a drain chamber 110. When the pressure within the drain chamber rises, the drain device 150 pushes open the ball 160 resisting against the spring 170, and the cutting fluid C1 is discharged to the exterior.

Abstract: A motor-driven working spindle for a machine tool has a casing in which a shaft is mounted for rotation. The shaft has a receptacle for a tool arranged at its front end. A spindle rotary drive is provided in the casing. Furthermore, a spindle advancing drive coupled with the shaft is provided in the casing.

Abstract: A tool clamping device of a tool seat is installed on a multifunctional machining center for firmly securing a tool having a steel ball collar and comprises a spindle, a disc-type spring, a draw rod, a hydraulic member and a steel ball. The draw rod is able to slide with respect to the spindle, pressed by the disc-type spring to contact the spindle, and pushed by the hydraulic member to separate from the spindle. The draw rod has a draw ring, and the steel ball is accommodated in the draw ring. The disc-type spring presses the draw rod and makes the draw ring push the steel ball outward and latch the steel ball collar of the tool, whereby the tool is firmly secured. The hydraulic member applies pressure to move the draw ring to accommodate the steel ball, whereby the tool is released.

Abstract: A chip discharge device for a machine tool is provided that has a simple structure, enables automatic replacement of tools, and is suitable for a machine tool in which a spindle head is turned about an axis of turning that is not parallel to the center axis of the spindle. A suction pipe 73 on the first support member side is disposed in parallel to a first axis of turning 191 to be centered on the axis of the through hole 192 of a first support member. A right end of the suction pipe 73 on the first support member side is fixed by bolts to a left end surface of the spindle head 18. An outer circumferential surface of the left end of the suction pipe 73 on the first support member side is connected to be able to relatively rotate to an inner circumferential surface at the lower end of a second communicating pipe 74. A seal mechanism 8 is provided in the connection portion, preventing the external air from being sucked into the second communicating pipe 74.

Abstract: A motor element for a dental medical handpiece or a motor spindle has an elongated shank, rotatably mounted in which there is a drive shaft and a longitudinally-extending rod, a tool-holder for a tool within the rod, and a disconnectable coupling between the rod and the tool-holder. A locking element secures the coupling to prevent the coupling from becoming disconnected from the elongated shank. The locking/unlocking of the coupling is effected by a relative movement between the tool-holder and the tool.

Abstract: A tool unclamping device according to the present invention comprises a motor, a rotary shaft connected to the motor, a cam provided on the rotary shaft, a power transmission member, pressed by the cam to be axially movable, having a recess at the center in the radial direction thereof, a frame so provided as to enclose the power transmission mechanism, a support member inserted into the power transmission mechanism in the radial direction thereof and fixed to the frame, an elastic member set in the recess located between the power transmission member and the support member for urging the power transmission member toward the motor and an output shaft driven by power from the power transmission mechanism for unclamping a tool.

Abstract: A spindle device of machine tool includes a pressure sensor (31) that detects a pressing force to a rod (18) by a drive (25), a displacement sensor (32) that detects displacement of the rod (18), a tool clamping-force detector (33) that detects a clamping force to a tool (19) by a collet (20) based on the pressing force to the rod (18) and the displacement of the rod (18), and a spring-replacement-timing determining unit (36) that determines a replacement timing of disc springs (24) based on the tool clamping force and a preset biasing force characteristic value of the disc springs (24), thereby allowing highly accurate determination of a replacement timing of a biasing unit by appropriately detecting a tool clamping force.