Abstract: In order to prevent a cutting tool from being detached from the holding device towards a bladed part-side when holding a standard cutting tool in the holding apparatus, a focus was placed on a diameter of a shank of the standard cutting tool which is larger than that of a bladed part-side cylindrical portion. A pressing portion pushes a retaining ring along a slope in a tool inserting hole towards its base end side so that an outer periphery of the retaining ring shrinks and an inner diameter of the retaining ring becomes smaller than the diameter of the shank.

Abstract: A cleaner having a simple configuration and capable of efficiently cleaning an inner surface defining a hollow portion of an object to be cleaned, wherein an outer boundary of a cross section of the hollow portion, which is taken perpendicularly to its central axis, forms an envelope of an approximate curved triangular shape, and a distance between any two parallel tangential lines in contact with the envelope is constant. The cleaner includes cleaning surfaces which can come into contact with the inner surface defining the hollow portion of the object to be cleaned, wherein the cleaning surfaces have a curvature radius equal to or less than the minimum curvature radius of the inner surface of the object when cleaning the inner surface.

Abstract: The cutting tool insert 1 is in a substantially plate form and of polygonal shape and is provided with a major cutting edge 16A (or 16B) extending from one corner 14A (or 14B) toward the other corner 15A (or 15B). The major cutting edge 16A (or 16B) comprises a first edge line and a second edge line that meet to form an obtuse angle, which causes the area where the first and second edge lines meet to protrude slightly outwards, as viewed from above. The first edge line slopes down towards the second edge line so that the distance with a seat face 11 decreases gradually as viewed from the side, and the first edge line forms an obtuse angle with the second edge line causing the top face area to dip down towards the seat face. The first edge line is shorter than the second edge line.

Abstract: The present invention provides a capped collet and a cap attached to the collet, which are capable of efficiently supplying a cooling fluid to a tool according to the type of the tool held therein, and of performing satisfactory cooling. The capped collet comprises: a collet body 10; a cap 11 which is attached to the top-end side of the collet body 10 in an attachable and detachable manner and which allows the tool to pierce therethrough; and a sealing member 12 placed between a tool holder 101 and the cap 11 in order to hermetically seal a space between them. The collet body 10 has a slot 13 formed at least from the top-end side thereof, and an annular projection 21 which is formed on the top-end side and which is coupled with the cap 11. The cap 1 has an annular groove 18 for coupling with the annular projection 21 of the collet body 10, and a cover 22 for covering the end face of the collet body 10 on the top-end side.

Abstract: The present invention provides a cutting tool insert capable of realizing a sufficiently large axial rake angle, exhibiting improved cutting ability, and conducting stable processing with little cutting vibrations, and also provides a cutting tool on which this insert is mounted. Specifically, an insert 1 and a cutting tool 100 on which the insert 1 is mounted are provided. The insert 1 is in a substantially plate form and of polygonal shape and is provided with a major cutting edge 16A (or 16B) extending from one corner 14A (or 14B) toward the other corner 15A (or 15B) as viewed from above. The major cutting edge 16A (or 16B) comprises a first edge line and a second edge line that meet to form an obtuse angle, which causes the area where the first and second edge lines meet to protrude slightly outwards, as viewed from above.

Abstract: The present invention provides a capped collet and a cap attached to the collet, which are capable of efficiently supplying a cooling fluid to a tool according to the type of the tool held therein, and of performing satisfactory cooling. The capped collet comprises: a collet body 10; a cap 11 which is attached to the top-end side of the collet body 10 in an attachable and detachable manner and which allows the tool to pierce therethrough; and a sealing member 12 placed between a tool holder 101 and the cap 11 in order to hermetically seal a space between them. The collet body 10 has a slot 13 formed at least from the top-end side thereof, and an annular projection 21 which is formed on the top-end side and which is coupled with the cap 11. The cap 1 has an annular groove 18 for coupling with the annular projection 21 of the collet body 10, and a cover 22 for covering the end face of the collet body 10 on the top-end side.

Abstract: A tapper mechanism having (i) a rotatable tapper body with a clutch, (ii) a driven shaft having a portion rotatably held coaxially in the tapper body for limited axial motion therein, (iii) an engageable claw connected from the driven shaft for selective engagement with the driven shaft for selectively transmitting torque from the tapper body to the driven shaft upon the axial movement of the driven shaft within the tapper body the transmission of torque from the tapper body to the driven shaft is interrupted by the disengagement of the clutch and the driven shaft is axially moved into a neutral state, (iv) a tap connected from an end of the driven shaft that is remote from the tapper body, (v) an engaging slider disposed between the driven shaft and the engageable claw, the engageable claw and the driven shaft being adapted to rotate together and are axially displaceable relative to each other within the tapper body during such rotation, and (vi) a clutch spring urging the engageable claw away from the clutc

Abstract: A coolant feeder in a tool holder assembly which has a rotary shaft for mounting from the spindle of an associated machine tool, the feeder comprising a stationary support member for journaling the rotary shaft, a stationary coolant feeder ring assembly having a hollow interior is disposed adjacent to the stationary support member, the stationary coolant feeder ring assembly being in fluid communication with a radially extending tool holding passage within the rotary shaft, a coolant coupling device having a hollow interior, a coolant pipe for maintaining fluid communication between the hollow interior of the coolant coupling device, the stationary support member, the passage, and the coolant feeder ring assembly.

Abstract: A transmission device in which planetary gears are disposed on the periphery of a sun gear so that each planetary gear can effect gear transmission and can revolve around the sun gear, and in which an internal gear wheel is disposed so as to wrap round the planetary gears so that the planetary gears can effect gear transmission in association with the internal gear wheel. A sun roller coaxial with the sun gear and capable of freely rotating independently of the sun gear is provided, and planetary rollers are also provided with being respectively coaxial with the planetary gears, freely rotatable independently of the same and having a rolling contact with the sun roller. An outer ring is disposed around the planetary rollers and has a rolling contact with the planetary rollers.

Abstract: An automatic tool-replacement apparatus including the main body of a machine tool on which a plurality of tools can be dismountably mounted. The tools are selectively held by an automatic tool-replacement arm and are mounted on or dismounted from the main body. The arm has a plurality of holding portions for holding the tools. Therefore, a plurality of tools can be mounted on or dismounted from the main body of the machine tool by one-time operation of a single arm. Each holding portion has a pawl for preventing disengagement of the tool positioned therein, this pawl being able to advance toward and retract away from the holding portion.

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 clamping apparatus for clamping the attachment for mounting the tool to the part to which the tool is mounted of the machine tools is disclosed. The attachment for mounting the tool is coaxially provided with the taper extruding shafts which are fitted into the taper hole of the part to which the tool is mounted and the holding shafts the peripheral part on the tip end of which has the holding claw being laterally extruded. The clamping cylindrical article equipped with the claw to be held whose engagement with the holding claw, introduced by the fixed angular amount of forward rotation of the clamping cylindrical article, allows the attachment for mounting the tool to be prevented from coming off, is disposed in the part to which the tool is mounted such that the clamping cylindrical article may be rotatable and axially movable.

Abstract: A chuck allowing to mount a cutting tool on the spindle of a machine tool. The chuck includes an ahead projecting chuck cylinder provided on the one side of a chuck body in a mated fashion to each other, and a tightening rotary sleeve mounted through needle rollers outside the chuck sleeve, in addition, slits configured in the top end part of the chuck cylinder, wherein the rotation of the tightening rotary sleeve causes the slits to contract so that a cutting tool is gripped.

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 chuck assembly for use in a machine tool for holding a tool element comprises a chuck body having a sleeve integrally formed therewith so as to extend in the direction, which sleeve has a support bore defined therein for the receipt and support of the tool element and also has its outer peripheral surface tapered in a direction away from the chuck body, a fastening nut having its inner peripheral surface tapered in complemental relation to the outer peripheral surface of the sleeve and helically rotatably mounted on the sleeve through a plurality of roll bearings, and a reinforcing nut threadingly mounted on the fastening nut and adapted to be engaged under pressure with the chuck body when the fastening nut has been fastened and the reinforcing nut is then fastened.

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.