Abstract: An object of the present invention is to obtain information corresponding to information, which is readable by sight, but no longer visible. The present invention provides a chuck mechanism comprising: a chuck body including an installation surface and a side surface; and a master jaw provided on the installation surface of the chuck body and configured to move in a radial direction of the chuck body, wherein a first marking is provided on the installation surface of the chuck body, the first marking is product information of the chuck mechanism, the product information has a readable form by sight, and at least one second marking is provided on the installation surface or the side surface of the chuck body, the second marking is information including at least the product information of the first marking, and the information of the second marking has a coded form.

Abstract: A spindle of a drilling tool includes a socket portion having a first axial length (a1) of a first diameter (d1) for receiving and attaching a drill bit to the spindle. The spindle includes a fluid conduit having a second diameter (d2) narrower than (d1) for conveying a fluid to the socket portion. An interface space with diameter (d1) is formed between the fluid conduit and the drill bit when the drill bit is installed in the socket portion. A fluid conveyor, having a third diameter (d3) narrower than (d1), connects the fluid conduit to the drill bit to avoid fluid gathering in a periphery of the interface space. The fluid conveyor includes a first O-ring abutting a mouth of the fluid conduit, a second O-ring abutting a mouth of a fluid channel of the drill bit, and a spring between the first and second O-rings.

Abstract: The invention relates to a chuck (1) for a machine tool for machining a tubular workpiece which rotates about a rotational axis (4) that coincides with the centre of the chuck, comprising at least two chucking slides (7a, b, c) that are designed to be positionable radially with respect to the rotational axis (4) in order to release and chuck the workpiece, are arranged on the end side of and in a manner distributed uniformly around the circumference of a chuck head plate (2), and bear chucking jaws (8a, b, c).

Abstract: A locating means (13) adapted to be supported from one element (11) for engagement with another element to retain the two elements in engagement with each other, the locating means comprising a lug (39) to be displaceable between an extended position at which it extends from the locating means and a retracted position at which it is located inward of the extended position, a driving member (29) slidably supported from the one element the lug and driver having at least two opposed faces, the other element having an abutment which is intended in use to be engaged by the lug when the lug is in the extended position and the two elements are in engagement with each other in order to retain the elements in said engagement with each other, the opposed faces being configured such that movement of the driving member relative to the lug causes the displacement of the lug.

Abstract: A graduated rotation control chuck assembly includes a base, a holding-down rod axially slidably mounted in the base, and a graduated rotation control unit, the graduation unit including a rotary shaft, mounted in the base and axially aimed at the holding-down rod to hold with the holding-down rod the workpiece to be processed, the rotary shaft having a first contact portion and a second contact portion, a first piston rod, and a second piston rod axially inserted through the first piston rod and mounted with the first piston rod in the base and being alternatively reciprocated against the first contact portion and second contact portion of the rotary shaft to rotate the rotary shaft step by step at a fixed angle per step.

Abstract: The present invention relates to an electrically driven chuck for holding a chuck of a machine tool, wherein an electrically driven chuck which has no need of any driving means to be exclusively used for a holding chuck, very simplified, and freely adjustable.Chuck fixing means 40 is locking means for locking a chuck body on a headstock 1. Position-deciding pin driving means 42 includes position-deciding part 43 which has piston 44. The insertion of position-deciding part 43 is inserted into position-deciding hole 41 when pressured air is supplied within cylinder 46. When built-in motor 4 is rotatively driven, both main spindle 2 and scroll 17 are rotatively driven, and jaws 30 move to hold or un-hold a work in the radial direction.

Abstract: An adjustable quick change chuck jaw apparatus for attachment to a master jaw in the front face of a rotary chuck allows a machinist to quickly change the chuck jaws from one diameter to another. A generally rectangular jaw body is connected to the master jaw of a rotary chuck and extends radially outward from the central rotational axis of the chuck. A jaw member is slidably mounted on one side of the jaw body to travel longitudinally relative thereto and has a workpiece gripping portion extending perpendicularly outward. A rotatable shaft mounted in the jaw body has a threaded segment configured to become engaged with mating threads on the jaw member when rotated to an engaged position and to become disengaged therefrom when rotated to a disengaged position. A spring biased locking pin in the jaw body allows selective engagement with the shaft to prevent rotation thereof in a locked position and to become disengaged therefrom to allow rotation in an unlocked position.

Abstract: A lap blank and holder assembly includes a lap blank having two spaced apart flat surfaces separated by a given thickness and formed from a material capable of compressing about a member inserted into it. The holder has a projection extending outwardly from a front face thereof and is inserted into the material making up the lap to secure it against rotational and shifting movement while being cut in a surfacing machine. This arrangement further allows the assembly to be placed as an assembly in a finishing machine for subsequent polishing of a cut lens surface in an off-axis polishing procedure.

Abstract: A lap blank and holder assembly includes a lap blank having two spaced apart flat surfaces separated by a given thickness and formed from a material capable of compressing about a member inserted into it. The holder has a projection extending outwardly from a front face thereof and is inserted into the material making up the lap to secure it against rotational and shifting movement while being cut in a surfacing machine. This arrangement further allows the assembly to be placed as an assembly in a finishing machine for subsequent polishing of a cut lens surface in a polishing procedure.

Abstract: A boregrinding chuck assembly includes a plurality of arrow-shaped jaws that each includes a head that is in the shape of an isosceles triangle with the apex angle thereof just slightly less than 360.degree. divided by the total number of jaws in the assembly so that there is a small gap defined between adjacent jaws when such jaws are holding a workpiece in position for a boregrinding operation. Each jaw includes a set of marking lines that are located to define a workpiece-engaging circle that has a diameter just slightly smaller than the outer diameter of the workpiece to securely hold such workpiece when all of the jaws are engaged against the workpiece. The jaws are customized by cutting the heads along the marking lines that are appropriate to the particular workpiece.

Abstract: A chuck comprises a scroll to simultaneously move a plurality of chuck jaw assemblies radially toward and away from a work piece. The chuck jaw assemblies include an inner chuck jaw part in engagement with the scroll and an outer chuck jaw part movable relative to the inner chuck jaw part radially toward and away from the axis. A ball detent mechanism returns to return the outer chuck jaw part to a predetermined or centered location after one work piece has been machined in preparation for work on the next work piece.

Abstract: Apparatus for monitoring or tracking the angular position of a rotating camshaft during grinding or milling of cams on the camshaft. The cams may be milled, but in the apparatus shown, they are ground by abrasive belts which are guided by actuators driven by CNC controlled motors, to obtain the desired cam contours. Monitoring is carried out by a pick-up member engageable with a locating pin on the camshaft. The pick-up member has a slot for receiving the locating pin between a locator pad and a leaf spring. The leaf spring clamps the pin against the locator pad. The pick-up member will closely follow the rotation of the camshaft despite variations in pin size, and feed back the exact rotative position of the camshaft to the CNC controlled motors consistently and accurately.

Abstract: An operation control device is provided for a chuck by which the rotary drive for the chuck is disengaged when the clamping motion leading to clamping of the workpiece in the chuck has not been provided or is not sufficient. The clamp jaws of the chuck are adjustable by a drive member guided axially in the chuch body which is connected to a clamping piston. The operation control device comprises a control piston which is acted on by a compressed medium against the force of a restoring spring and is locked by the drive member against the sliding caused by the compressed medium in a locked position disconnected from the rotary drive if the drive member is positioned in the end safety region of its axial displacement.

Abstract: An improved pull-back chuck is disclosed that detects when a workpiece is properly located against a locating surface of the chuck and when the workpiece is gripped with sufficient force by the jaws. A transducer is disposed within a master jaw in a portion deformable by operating levers of the chuck assembly. When sufficient force is applied to the workpiece by action of the operating levers, a portion of the master jaw deforms causing the transducer to deform and modify an electrical signal in proportion to the pressure. A switch located in an aperture of a locating plate has an actuator that protrudes beyond the locating surface of the locating plate. When a reference surface of the workpiece abuts the locating surface of the locating plate of the chuck, the actuator is depressed by the workpiece and the switch changes electrical condition giving an indication of abutment.

Abstract: To check the flat or planar clamping of a workpiece in the jaws of a chuck, and/or to measure the respective clamping jaws, a pressure responsive signal transmitter is provided in at least one of the contact surfaces of a clamping jaw 6 or in an elastically deformable zone, which can be electrically coupled to measuring instruments provided outside the chuck body, in order to evaluate the signals. This makes it possible to find out, before starting the operation of a machine tool, whether the workpiece is correctly clamped, and with what clamping force.

Abstract: To check the operating conditions of a power chuck, compressed air is supplied to the contact surfaces of the clamping jaws and/or of the workpiece to be clamped. Air passages are provided in the chuck body which open into the contact surfaces. The escaping air makes it possible to find out whether the contact is planar, and thus whether the clamping is exact.

Abstract: Method and apparatus for centrally mounting one circular plate relative to another circular plate. The use of such method and apparatus in conjunction with a device for centering and holding a piece of pottery in a central position relative a potter's wheel axis is described.

Abstract: A workholding device comprises a body 10, a plurality of relatively movable base jaws 12, each base jaw 12 carrying one of a plurality of top jaws 13, such that when the base jaws 12 are moved relative to one another, a workpiece 15 can be gripped by the top jaws 13, and a sensing device 14 positioned to sense force transmitted from a top jaw 13 to a base jaw 12. Preferably a second sensing device 16 is provided to sense centrifugal force to permit compensation for its effect on the top jaws, so that a signal can be obtained which is an accurate measure of the force prevailing between the top jaws 13 and the workpiece 15.

Abstract: A power chuck has a chuck body rotatable about an axis, forming at least one cylinder, and having a front face. A plurality of jaws are displaceable radially on the front face between radially inner and outer end positions by an operating member axially displaceable on the body between a pair of axially offset end positions. Mechanism between the jaws and the member displaces the jaws toward the radial inner positions on displacement of the member in a first axial direction and displaces the jaws toward the radial outer positions on displacement of the member in a second axial direction opposite the first direction on the body. A drive piston the one cylinder of the body is fixed on and axially jointly displaceable with the member and forms in the one cylinder at least one compartment pressurizable to urge the drive piston and the operating member in one of the axial directions.

Abstract: In a clamping unit, particularly in a chuck with exchangeable jaws, one terminal clamping position is reached during opening when the clamping jaws approach the limit of stability. The other end position is reached during closing when the jaws approach the point where they cannot be moved any further. However, both end positions must be so far removed from the rest position or the stop position that a residual clamping stroke remains which insures safe clamping even then in the terminal clamping positions. The terminal clamping positions are different for chucks of varying sizes, and so are the clamping strokes. To adjust the end positions as well as for determining the attainment of these end positions, an apparatus is provided comprising a transmitter device and a sensor device which reacts to approach or contact. Spacing is changeable with the adjustment of the clamping jaws.

Abstract: A mounting for a circular saw which rotatably supports the saw in a grinding machine. The mounting includes a mounting plate, and three roller mounts mounted for movement on the mounting plate in paths that diverge from each other extending outwardly from a common center. Each roller mount mounts a roller which engages the edge in a saw defining the edge of the saw.

Abstract: An improved device for controlling a working machine of the type having a chuck body including a rotary chuck cylinder closed by a cylinder cover to define a substantially closed pressure space and a chuck piston slidably disposed in the pressure space for displacement responsive to a fluid pressure, includes, a pulse generator member axially guided within the chuck body in communication with the pressure space for movement responsive to one of the fluid pressure at a predetermined level and the position of the chuck piston at a predetermined position, or both. A switch is provided outside of the chuck body at a spaced location therefrom for switching the machine off. A control member is displaceably mounted in the chuck body operative to interconnect the pulse generator member responsive to movement of the pulse generator member.