Abstract: A jig system with hydraulic expansion clamp mechanism for clamping a work piece includes a plate that is manufactured integrally as one piece using three-dimensional printing. The plate is formed with an expansion chamber that is defined by a surrounding wall for allowing the work piece to extend therethrough, an inlet that is fluidly connected to a hydraulic source that supplies pressurized fluid, and a passage that is fluidly connected to the inlet and the expansion chamber. When pressurized fluid is supplied into the passage from the inlet, the expansion chamber is caused to expand and move the surrounding wall inwardly into contact with the work piece.

Abstract: A guide bush adjusting device includes a drawbar (a mobile body) displaceable relative to a guide bush sleeve (cylindrical body). The drawbar is formed from a screw connection member (a connection member) which is connected to a guide bush housed in the guide bush sleeve (a cylindrical body), and an operation member configured to displace the screw connection member. The guide bush adjusting device adjusts an inner diameter of the guide bush by releasing the operation member from its fixation, displacing the drawbar, moving the guide bush with respect to the guide bush sleeve via the drawbar to thereby position the guide bush, and fixing the operation member of the drawbar (mobile body) at a predetermined position.

Abstract: The invention relates to a workholder (10) for holding a workpiece to be processed in a machine tool, which workholder (10) is in the form of a annular body (12) having a central through hole (14), said annular body (12) having at least one weakened area (18, 20; 34, 36, 38, 40; 50, 52, 54, 56) obtained by material removal, as well as at least one pressure chamber (22; 42, 44; 58, 60) assigned to said at least one weakened area (18, 20; 34, 36, 38, 40; 50, 52, 54, 56) that can be charged with a pressurized fluid. Said at least one weakened area (18, 20; 34, 36, 38, 40; 50, 52, 54, 56) is dimensioned and arranged so as to cause said annular body (12) to be elastically deformable in an axial and/or a radial direction (a, r). As a result, with pressure acting on said pressure chamber (22; 42, 44; 58, 60), said annular body (12) can then be deformed elastically in a well-defined manner in an axial and/or a radial direction (a, r).

Abstract: A chuck assembly includes a chuck base configured to interface with a spindle of a machine tool, a cartridge including a receiving opening for receiving a workpiece to be worked using the machine tool, and clamping jaws disposed proximate to a working end of the chuck base to hold the cartridge therebetween. The cartridge further comprises a multi-axis clamping and locating assembly that simultaneously positions the workpiece and clamps the workpiece responsive to insertion of the workpiece into the receiving opening such that at least a portion of the workpiece that is to be worked via the machine tool is aligned with an axis of rotation of the chuck assembly.

Abstract: A system, in certain embodiments, includes a cutting tool, a drive and a chuck rotatable by the drive. The chuck includes multiple actuator arms, multiple jaws and multiple spring-loaded lock pins coupling the respective jaws to the respective actuator arms.

Abstract: A clamping device for fixing a machined part to a processing axis in a machine tool including the processing axis, a clamping head which is rotatable thereabout and with clamping elements floatably arranged thereon.

Abstract: A floating chuck mechanism provided at a workhead that is arranged at a processing apparatus for sandwiching a cylindrical-shaped workpiece by means of two center members along a rotational axis, the floating chuck mechanism causing the workpiece to rotate about the rotational axis and correcting an eccentricity between the rotational axis and a center of an outer diameter of the workpiece, includes a chuck body portion including plurality of clamp jaws for holding the workpiece from the outer peripheral side thereof, and a chuck base portion fixed to the workhead so as to rotate therewith, the chuck base portion including a fixed portion fixed to the workhead and a slide portion slidable along a slide surface perpendicular to the rotational axis. The chuck body portion is fixed to the slide portion and sliding along the slide surface so as to correct the eccentricity.

Abstract: A chuck (1) for angular offset woodturning including a first member (2) adapted to be secured to a lathe, and a second member (3) adapted to support a work piece and secured to the first member in such that the second member is oriented with respect to the first member between at least two configurations. The first member having a first axis (4) coaxial with an axis of rotation of the lathe and the second member having a second axis (5), and in one of the configurations the second axis is coaxial with the first axis, and in the other configuration the second axis is angularly offset. The chuck further includes a releasable fastening member (12) incorporating alignment members allowing the second member to be secured in one of the two configurations and that in the other configuration the second axis lies relative to said first axis at one of a number of predetermined angular offsets.

Abstract: A workholding chuck can use actuating members that pivot within a non-split unitary front bearing. The non-split unitary front bearing can include pockets in its central bore that can allow a spherical section of an actuator arm to be inserted into the bearing. The spherical section can include radially recessed areas to facilitate the insertion into the bearing. The jaws can be retained to the actuator arms through the use of a quick-release assembly. The quick-release assembly allows the jaws to easily and quickly be changed to allow the chuck to grasp different workpieces.

Abstract: A floating chuck mechanism provided at a workhead that is arranged at a processing apparatus for sandwiching a cylindrical-shaped workpiece by means of two center members along a rotational axis, the floating chuck mechanism causing the workpiece to rotate about the rotational axis and correcting an eccentricity between the rotational axis and a center of an outer diameter of the workpiece, includes a chuck body portion including plurality of clamp jaws for holding the workpiece from the outer peripheral side thereof, and a chuck base portion fixed to the workhead so as to rotate therewith, the chuck base portion including a fixed portion fixed to the workhead and a slide portion slidable along a slide surface perpendicular to the rotational axis. The chuck body portion is fixed to the slide portion and sliding along the slide surface so as to correct the eccentricity.

Abstract: An apparatus that includes a rotatable single wafer holding bracket with one or more wafer supports disposed on the single wafer holding bracket, wherein the one or more wafer supports position a center of a wafer to be off-center from an axis of rotation of the single wafer holding bracket.

Abstract: An eccentric work piece holder supports a work piece in alignment during rotary operations. First-, second- and third aligning members, associated with the rotary axis of a rotary unit, provides pivoting movements relative to the rotary axis while bearing the work piece. These pivoting movements of the aligning members enable the work piece to be aligned during rotary operations.

Abstract: A chuck has a chuck body rotatable about a main axis and a plate displaceable axially on the body between an outer position and an inner position. Springs urge the plate into the outer position. A locking element on the body can move between a blocking position preventing displacement of the plate from the outer position into the inner position and a freeing position permitting such displacement. A plurality of jaw holders angularly spaced about the axis are fixed axially on the plate and each have radially displaceable outer and inner ends. A piston axially displaceable in the body has cam formations engaging the jaw-holder inner ends for radially displacing the jaw-holder outer ends on axial displacement of the piston.

Abstract: A method of alignably supporting an eccentric work piece for rotary movements uses a work piece holder that supports the work piece in alignment during rotary operations. A plurality of cooperating aligning members mounted along the rotary axis of a rotary unit, provides pivoting movements relative to the rotary axis while bearing the work piece. These pivoting movements of the aligning members enable the work piece to be aligned during rotary operations.

Abstract: A method of alignably supporting an eccentric work piece for rotary movements uses a work piece holder that supports the work piece in alignment during rotary operations. A plurality of cooperating aligning members mounted along the rotary axis of a rotary unit, provides pivoting movements relative to the rotary axis while bearing the work piece. These pivoting movements of the aligning members enable the work piece to be aligned during rotary operations.

Abstract: An eccentric work piece holder supports a work piece in alignment during rotary operations. First-, second- and third aligning members, associated with the rotary axis of a rotary unit, provides pivoting movements relative to the rotary axis while bearing the work piece. These pivoting movements of the aligning members enable the work piece to be aligned during rotary operations.

Abstract: The chuck comprises jaws which, in addition to their radial movement, can each swivel around an axis essentially parallel to the axis of the chuck, and where this axis glides in a radial slideway of the chuck in order to allow said radial movement. This swivelling action ensures that the working surfaces of the jaws or of shoes sitting on them which are adapted to the outer shape of the workpiece will sit evenly on the workpiece even when the latter is mounted between centers and as a consequence its rotation axis does not coincide exactly with that of the chuck.

Abstract: An equalizing chuck assembly for heavy duty application includes a chucking assembly having a plurality of rocker arms operably connected to an actuator by a plurality of toggle links. Jaw members are disposed on one end of the rocker arms and a counterweight is disposed on an opposite end of the rocker arms. The equalizing chuck assembly utilizes a plurality of equalizing plates interconnected between the actuator and the rocker arm to provide a degree of adjustment to accommodate eccentricities within the workpiece to be held by the chucking assembly.

Abstract: The chuck comprises jaws which, in addition to their radial movement, can each swivel around an axis essentially parallel to the axis of the chuck, thus ensuring that the working surfaces of the jaws or of shoes sitting on them which are adapted to the outer shape of the workpiece will sit evenly on the workpiece even when the latter is mounted between centers and as a consequence its rotation axis does not coincide exactly with that of the chuck.

Abstract: An equalizing chuck assembly for heavy duty application includes a chucking assembly having a plurality of rocker arms operably connected to an actuator by a plurality of toggle links. Jaw members are disposed on one end of the rocker arms and a counterweight is disposed on an opposite end of the rocker arms. The equalizing chuck assembly utilizes a plurality of equalizing plates interconnected between the actuator and the rocker arm to provide a degree of adjustment to accommodate eccentricities within the workpiece to be held by the chucking assembly.

Abstract: A clamping device for objects, has a housing, at least two clamping jaws which is radially displaceably guided relative to a longitudinal central axis, actuating elements associated with the clamping jaws for actuating the latter, clamping pistons displaceable in a cylinder chamber and acted for clamping of the clamping jaws by a pressure medium under pressure at least in one working direction, the actuating element being in operative communication with the clamping piston at least in a working position, at least one central adjusting device displaceably arranged in the housing and acting on the actuating elements, abutment means including an abutment for each of the actuating element against which each of the actuating elements can abut, the actuating elements being formed as angular levers which are turnably held in the housing and engage at one end with associated one of the clamping pistons and on the other hand with an associated one of the clamping jaws.

Abstract: There is provided a chuck having four radial jaw grooves, two pairs of opposed jaws movably provided in the grooves, a first rotary vane actuator for actuating one pair of the opposed jaws, and a second rotary actuator for actuating the other pair of the opposed jaws, an inlet for admitting fluid into chambers of the actuators, and an outlet for discharging fluid from the chambers. The first and second vane actuators are opearated by the fluid admitted from the one inlet such that the two pairs of opposed jaws are differentially actuated by said first and second rotary vane actuators. The first rotary vane actuator includes a first pressure chamber and the second rotary vane actuator includes a second pressure chamber, in which the first and second pressure chambers are in fluid communication via at least one fluid-conducting path.

Abstract: A lathe chuck has a chuck body rotatable about an axis and having a plurality of angularly equispaced and axially forwardly open angled guides, a set of first jaws in some of the guides, and a set of second jaws in the other guides alternating with the first jaws. Respective first and second actuating plates coupled to the respective sets of jaws are axially displaceable to radially displace the jaws in the guides. An actuating shaft axially is displaceable in the body. A rocker connects the shaft with the plates for limited relative axial movement of the plates so that the first jaws can engage the workpiece before the second jaws. The actuating shaft has a tubular front end, a core shaft is axially connected to one of the plates and coaxially received in the actuating-shaft end, and a tube shaft is axially connected to the other of the plates and coaxially surrounds the actuating-shaft end. This actuating-shaft end in turn has a radially throughgoing hole through which the rocker extends.

Abstract: The clamping chuck comprises six jaw carrier arms (4) that are operated two by two by one and the same compensator (5). Each compensator hinges with a pulling member (3) centered on the axis of the chuck and sliding axially in its main body (1) through the action of a traction rod (11). The pulling member is provided with pairs of wings (14a, 14b) extending on either side of the central portion of the compensator (5). Application to clamping chucks for high speed machining.

Abstract: The invention provides a chuck including a plurality of jaws (8), each of which is fixed to the forward end of a jaw carrier arm (5), said arm (5) being borne by a pivot joint (6) mounted on the body (1) of the chuck and the rotation of which imparts to the jaw (8) an essentially radial movement, said rotation being controlled by radially displacing a sliding member (4) pushing a truncated sphere (10) housed between said sliding member (4) and a recess provided in the arm (5) to the rear of said pivot joint (6). Furthermore, said truncated sphere (10) is capable of sliding over the plane surface of contact with the sliding member (4), said jaw carrier arm (5) then sliding in the pivot joint (6) in an essentially axial direction, while being drawn rearwards by a return spring (7). Application to the clamping of a piece while pressing it axially against its stops.

Abstract: A chuck adapter attachable to a fixed chuck mechanism for converting the fixed chuck mechanism to a compensating chuck mechanism includes an attachment plate for connection to the head of the fixed chuck mechanism. The attachment plate includes a plurality of slots formed therein for alignment with respective drive jaws on the fixed chuck head. A plurality of adapter jaws are provided, each movable along a respective one of the plate slots, each adapter jaw including a movable clamping pin extending therefrom, and each adapter jaw including a hydraulic displacement member which reacts to movement of the clamping pin. A hydraulic circuit is provided in fluid communication with each of the hydraulic displacement members for maintaining substantially the same clamping force on each of the clamping pins as the clamping pins move.

Abstract: Each of master jaws (17) has a middle spherical part guided for sliding movement by a spherical guide surface (16) formed in a chuck body (2), a round back end part (19) extended slidably through a spherical bearing member (12) supported on a support member (10) attached to a middle part of a driving member (5). Each master jaw (17) is provided with a through hole (26) extending between the front and the back end thereof and a sliding member (30) is inserted in the through hole of the master jaw (17) through the front end of the same so as to come into sliding contact with a stopper (36) attached to a chuck body (2). Therefore, the state of sliding contact between the sliding member (30) and the stopper (36) can be adjusted on the side of the front part of the chuck and work for adjusting the state of sliding contact can be easily achieved.

Abstract: The present invention is directed to a chucking system. The body of the chucking system preferably houses cam plates which may be driven manually by an independent worm shaft, or hydraulically by a piston/gear rack in lieu of a worm shaft. A face plate preferably houses four master jaws. The jaws may be engaged to the cam plates by pins. The jaws may be moved inward and outward preferably by rotation of the cam plates due to the ascending/descending slope of the slots in the cam plates. Each set of two jaws may be driven independently of the other because of the two separate cam plate mechanisms. The top cam plate is preferably held concentrically to the bottom cam plate by a needle bearing. The entire cam plate may “sandwich” pivot on a center tube which may be anchored in the base of the body and the top face plate.

Abstract: An equalizing power chuck includes a body, a plurality of work engaging jaws, and a plurality of rocker arms carrying the jaws. The rocker arms extend axially along an axis and have a mounting portion at one axial end for the jaws and an end portion at the other axial end. The equalizing power chuck also includes a plurality of swivel mountings connecting the rocker arms to the body, a plurality of slide members receiving the end portions of the rocker arms, a reciprocal actuator disposed centrally of the rocker arms, and a plurality of carrier members pivotally secured to the actuator. Each of the carrier members operatively cooperates with a pair of the slide members such that reciprocatory movement of the actuator moves the carrier members and correspondingly the slide members to move pairs of the jaws simultaneously relative to each other to engage a work-piece therebetween and allows the pairs of the jaws to pivot until a pressure exerted on the work-piece by the work engaging jaws is equalized.

Abstract: A tool holder includes a holder body having a first section to be attached to a machine and a second section coaxially exteding from the first section, a ring in which part of the holder body is received, and an assembling device for removably assembling the ring to the holder body. The holder body further has a contacting portion facing the machine side and with which at least part of the ring is brought into contact.

Abstract: A plurality of clamping motion elements with clamping jaws are moved out of an initial position towards a workpiece under a low operating pressure and caused to bear thereagainst. When all the clamping jaws bear uniformly against the workpiece, a full clamping pressure is applied to clamp the workpiece fast in position.

Abstract: A chuck has a chuck body, an actuating element limitedly axially displaceable in the body, a first set of guide pistons axially fixed in the actuating element, angularly spaced about the axis, and each forming a guide passage extending at a small acute angle to the chuck axis, and a second set of guide pistons limitedly axially movable in the actuating element, angularly spaced about the axis, interleaved with the axially fixed guide pistons, and each forming a guide passage extending at a small acute angle to the chuck axis. Respective jaw bolts slidable in the passages each have an outer end projecting forward from the chuck body and a rear end axially coupled to the chuck body. The outer ends of the jaw bolts of the axially fixed pistons define a fixed-jaw circle centered on the chuck axis and the outer ends of the jaw bolts of the axially movable pistons define a movable-jaw circle centered on the axis.

Abstract: Clamping is ensured by at least two pivoting arms one end of which co-operates with a half draw member (10a, 10b) via a link having a truncated sphere (19) and an inclined plane (10). The draw member is mounted coaxially outside a locking ring (9) displaceable through the action of a traction rod (5). The system of transmission between the ring and the draw member is provided with compensating and locking means constituted by a guide (11), a compensating disk (13) and an adjusting member (14) co-operating with an oblique face of the compensating disk.

Abstract: An equalizing chuck includes a body, a plurality of work engaging jaws, and a plurality of rocker arms carrying the jaws. The rocker arms extends axially along an axis and have a mounting portion at one axial end for the jaws and an end portion at the other axial end. The equalizing chuck also includes a plurality of swivel mountings connecting the rocker arms to the body, a plurality of slide members receiving the end portions of the rocker arms, a reciprocal actuator disposed centrally of the rocker arms, and a plurality of segments slidably secured to the actuator. The segments are operative to move in a radial manner with respect to a centerline of the body and operatively cooperate with the slide members such that reciprocatory movement of the actuator moves the segments and correspondingly the slide members to move the jaws relative to each other.

Abstract: This invention relates to a gripping jaw (1) comprising: a body (4); a traction rod (6) sliding axially in the body (4); at least one jaw holder (3) sliding radially in the body (4); and a transmission system (7,8) converting axial translation of the traction rod (6) into the radial translation of each jaw holder (3). Each jaw holder (3) is fitted with a guiding member (10) guided radially along a groove (14) recessed within the chuck (1), the member being uniquely free to swivel axially in relation to the jaw holder.

Abstract: A method and apparatus for a self compensating and geometrically centering jaw type chuck for engaging and retaining a workpiece, particularly an asymmetric workpiece, wherein a geometric center of the workpiece is aligned with a rotation axis of the chuck. The chuck includes two opposing jaws each of which is rotatable about a pivot pin extending from a radially adjustable jaw slide. Each jaw includes an outer end that is slidably and rotatably coupled to a rotatable ring symmetrically disposed about the rotation axis by a synchronizing pin having a first end rotatably disposed on the rotatable ring, and a second end, slidably engagable with the outer end of the jaw. The rotation of one jaw about the pivot pin rotates, in synchronism, the rotatable ring and the other jaw to maintain the geometric center of the asymmetric workpiece in alignment with the rotation axis of the chuck. The jaw slides are radially adjustable to open and close the jaws by reciprocating a piston along the rotation axis of the chuck.

Abstract: Workpiece chucking apparatus includes a chuck body mounting a first plurality of prepositioning lock-up fingers and a second plurality of gripping fingers. The lock-up fingers are biased together radially outwardly or inwardly into engagement with a peripheral wall of a workpiece to initially locate and support the wall of the workpiece in a centered position with respect to a central axis of the chucking apparatus. An inflatable bladder flexes the remaining gripping fingers into gripping engagement with the peripheral wall to further radially support the wall in preparation for machining, without disturbing the prepositioning of the workpiece.

Abstract: Workpiece chucking apparatus includes a chuck body mounting a first plurality of lock-up fingers and a second plurality of gripping fingers. The lock-up fingers are individually biased radially outward into engagement with a peripheral wall of a workpiece to initially support the workpiece in a predetermined position irrespective of the eccentricity of the peripheral wall with respect to other portions of the workpiece which are first located concentrically with the chuck axis. An inflatable bladder flexes the remaining gripping fingers into gripping engagement with the peripheral wall to further radially support the wall in preparation for machining, without disturbing the prepositioning of the workpiece.

Abstract: A chuck for gripping workpieces to be machined has a chuck body with a workpiece support surface for supporting a workpiece to be machined. Generally radially movable centering and gripping collet fingers are concentrically supported by the chuck body. An inflatable bladder is further mounted on the chuck body in generally concentric relationship with the fingers. Control mechanism is provided for initially radially moving the centering fingers to cause them to move radially and center said workpiece, and then supplies a fluid under pressure to inflate the bladder and move the gripping fingers generally radially to fully grip the centered workpiece.

Abstract: A guide bush is described, having a bush-holder and a quill integral with the bush support. The device has a clamp capable of rotating a workpiece, means for opening and closing the clamp and regulating means adapted to monitor the opening and closing means in order to compensate for changes in the dimensional tolerances of the workpiece, wherein the bush regulating means are adapted to operate the opening and closing means of the clamping means very quickly as a direct result of variations in the dimensional tolerances of the workpiece in order to provide a substantially constant pressure of the clamp on the workpiece. The bush is for use with a machine tool such as a travelling headstock automatic lathe.

Abstract: A power chuck includes a body, a plurality of work engaging jaws, a plurality of rocker arms carrying the jaws, and a plurality of swivel mountings connecting the rocker arms to the body. The power chuck also includes a plurality of slide members connected to and matingly engaging the rocker arms and a reciprocable actuator disposed centrally of the rocker arms and operatively cooperating with the slide members. Reciprocatory movement of the actuator along the slide members rocks the rocker arms in the swivel mountings and moves the jaws radially relative to each other.

Abstract: A chuck with four differential jaws capable of holding an object of an irregular shape with even fixing force from four jaws by driving all four jaws disposed in a cross at right angle at the same time by a single operation. In the first type chuck, two jaws each are held opposingly on a front face of a chuck body, and these jaws are driven by a differential mechanism through jaw driving cams. The differential mechanism comprises a driving cam movable by movement of a drawing bar in axial direction along the axis and rotatable around the axis and a set of outer and inner differential cams each having a long hole provided so as to engage with the driving cam at the same time. These differential cams transmit an even fixing force to the jaws. The jaw driving cams are formed to be capable of conversion to types for inward fixing, outward fixing, and positioning.

Abstract: A chuck jaw is provided having a pivotally mounted gripper mounted to the base jaw. Each end of the gripper serves as a chuck point, so that a three-jaw chuck can be used to provide six chuck points. Preferably, rollers are provided at each chuck point of the gripper to ensure even distribution of forces around the workpiece. In addition, spring plungers preferably are provided to limit the degree of pivoting of the gripper relative to the base jaw when a workpiece is not mounted on the chuck.