Abstract: A contact detecting system in a machine tool, used in combination with a switch-contained touch sensor seared in a spindle of the machine tool having a movable stylus for making an usually closed switch open by moving itself due to contact with an object such as a workpiece to be detected, which can obtain an output from a sensor unit when the stylus is brought into contact with the workpiece.

Abstract: A device for supporting a stylus in a touch sensor comprises a casing, a stylus having its one end part protruding out of the casing for detecting an object, and a spring for pressing an inner base part of the stylus housed concentrically in the casing outwards from behind wherein a ball is provided at each of three abaxial positions on one of the mutually opposite faces of the stylus inner base part and an end part of the casing while an engaged part with which the ball is allowed to come into contact is configured at each of three corresponding positions on the other of said opposite faces, the three engaged parts are configured respectively into different shapes so the stylus can be kept steady in the casing.

Abstract: A collet chuck including a chuck body, a collet which is fitted into the chuck body thereof, a fastening nut for chucking a cutting tool which is screwed into the main body of the chuck when the fastening nut is attachably connected to the collet and the collet is adapted to be reduced in diameter and wherein an external flange is provided around the collet, a pair of internal flanges are provided on the fastening nut, and fitting of these flanges into one another permits the collet and the fastening nut to be detachably connected to one another while a pair of notched portions opposite each are formed on the inward flanges of the fastening nut so that mounting and detaching can be easily performed.

Abstract: A milling cutter having an internal thread in the end face of a shank thereof for preventing accidental detachment, wherein a small-diameter thread part provided in one end of an adapter is screwed in to the internal thread set forth above while a large-diameter thread part, or a large-diameter rod part provided in the other end of the adapter is screwed in to an internal thread, or inserted into a hole respectively arranged on the axis of a chuck, the rod part being secured with a set screw.

Abstract: A tapper for loading a spindle of machine tools with a tap. The tapper proper has a shaft to be driven, which is supported under floating axially by means of a pair of springs the pressurizing direction of which are opposite to each other, built-in. Cutting oil is pressurized to be fed from the outside of the tapper proper through oil passages, respectively which are provided on the tapper proper and the shaft to be driven to a oil hole and, in that case, the oil passages are formed such that the resultant hydraulic pressure does not give rise to an action of breaking the floating state of the shaft to be driven.

Abstract: A contact detecting system for detecting the contact of a tool element, supported by a main shaft of a machine, with a workpiece comprises exciting and detecting coil assemblies, an electric power source for supplying a high frequency electric current to the exciting coil assembly to cause the latter to produce an induction current flowing in a loop circuit constituted by the machine shaft, the tool element and a framework of the machine, and a detector unit for generating a detection signal indicative of the actual contact of the tool element with the workpiece when the detector unit has detected the presence of a current component, which has resulted from the induction current generated by the exciting coil assembly, in the output signal from the detecting coil assembly.

Abstract: An interchangeable machine tool holder unit for use in a machining apparatus for the support of a machining element, for example, a cutting bit, which includes an elongated rotary body adapted to be driven in one direction about the longitudinal axis thereof, a tool holder supported in end-to-end fashion by the rotary body for movement in a direction radially of the rotary body, an axially displaceable member axially displaceably carried inside the rotary body, and an indexing mechanism for causing the axially displaceable member to move in the axial direction each time the rotary body undergoes one complete rotation to permit the tool holder to move in the radial direction.

Abstract: A tool holder assembly which comprises a tool holder adapted to be connected with a machine spindle for rotation together therewith, a stationary support member for rotatably supporting the tool holder and adapted to be connected to a fixed portion of the machine, a fluid supply circuit defined in the tool holder for the supply of a cutting fluid from an external source thereof towards a fluid discharge passage defined in a machine tool replaceably carried by the tool holder, and a vane-type displacement pump for forcibly pumping the cutting fluid from the fluid supply circuit to the fluid discharge passage in the machine tool for pouring the cutting fluid onto the workpiece being machined by the cutting tool. The displacement pump has its rotor constituted by a portion of the tool holder, and a pump casing constituted by a portion of the stationary support member.

Abstract: A touch sensor which is used to examine the machining accuracy of articles to be worked or used in a numerical control tool machine with an automatic tool converter (ATC) known as the machining center comprising a sensor rod which contacts the workpiece and detects the position to be worked, a plunger which shifts the displacement of the sensor rod to a rectilinear motion, a globe joint portion which is provided between the sensor rod and the plunger, a flange portion provided at the rear end portion of the sensor rod and a sensing device connected to the flange portion. In the touch sensor of the present invention, the displacement of the sensor rod is detected with the sensing device through the flange portion, the detecting signals are transmitted to a memory or the numerical control tool machine and in this way the machining accuracy of the workpiece or position to be worked can be detected automatically and exactly.

Abstract: A tool-holder chuck for receiving therein a tool holder provided with various tools such as end mills or drills, etc., e.g. in a milling machine, which chuck can be changed easily when necessary, comprising a clamp including a nut which is threaded to a chuck body, a clamp ring which can move only in the coaxial direction against the body, and a plurality of rolling members that transmit at least the coaxial movement of the nut to the clamp ring when it is screwed in, projections on the tool holder being pressed inward by the coaxial movement of the clamp ring as a result of screwing of the nut, and a taper spindle of the holder, that interlocks with a tapered bore of the chuck body. In this way direct sliding friction against the projections is eliminated, and the tool holder can be clamped tightly, with relatively small screwing force of the nut, utilizing the sliding friction between the nut and the clamp ring.