Abstract: A tool holder is equipped with a tip run-out correction mechanism for correcting run-out of the tip of the tool. The tip run-out correction mechanism includes an annular stepped portion formed on a cylindrical support portion of a holder body; a ring member rotatably fitted onto the annular stepped portion; an eccentric cam disposed within the ring member, the eccentric cam extending radially through the ring member and being rotatable about a radially extending axis; and a pin disposed within the ring member to be movable along a direction parallel to the center axis of a flange portion of the holder body. One end of the pin is in contact with the eccentric cam, and the other end of the pin is in contact with a rear end face of a clamp sleeve which clamps a tool inserted into a chuck sleeve of the holder body.

Abstract: A wrench includes a wrench body having a ring portion and a handle portion. A retainer that holds a plurality of wedge members is disposed inside the ring portion. Wedge guide grooves are formed on the inner circumferential surface of the ring portion. Each of the wedge guide grooves has a free region which maintains the corresponding wedge member in a free state, and left-hand and right-hand wedge regions each of which maintains the corresponding wedge member in a caught state. The wrench is provided with a changeover mechanism for moving the retainer to a position at which the wedge member faces the corresponding free region, a position at which the wedge member faces the corresponding left-hand wedge region, or a position at which the wedge member faces the corresponding right-hand wedge region.

Abstract: A tool holder is equipped with a tip run-out correction mechanism for correcting run-out of the tip of the tool. The tip run-out correction mechanism includes an annular stepped portion formed on a cylindrical support portion of a holder body; a ring member rotatably fitted onto the annular stepped portion; an eccentric cam disposed within the ring member, the eccentric cam extending radially through the ring member and being rotatable about a radially extending axis; and a pin disposed within the ring member to be movable along a direction parallel to the center axis of a flange portion of the holder body. One end of the pin is in contact with the eccentric cam, and the other end of the pin is in contact with a rear end face of a clamp sleeve which clamps a tool inserted into a chuck sleeve of the holder body.

Abstract: A wrench includes a wrench body having a ring portion and a handle portion. A retainer that holds a plurality of wedge members is disposed inside the ring portion. Wedge guide grooves are formed on the inner circumferential surface of the ring portion. Each of the wedge guide grooves has a free region which maintains the corresponding wedge member in a free state, and left-hand and right-hand wedge regions each of which maintains the corresponding wedge member in a caught state. The wrench is provided with a changeover mechanism for moving the retainer to a position at which the wedge member faces the corresponding free region, a position at which the wedge member faces the corresponding left-hand wedge region, or a position at which the wedge member faces the corresponding right-hand wedge region.

Abstract: A tool holder is equipped with a tip run-out correction mechanism for correcting run-out of the tip of the tool. The tip run-out correction mechanism includes an annular stepped portion formed on a cylindrical support portion of a holder body; a ring member rotatably fitted onto the annular stepped portion; an eccentric cam disposed within the ring member, the eccentric cam extending radially through the ring member and being rotatable about a radially extending axis; and a pin disposed within the ring member to be movable along a direction parallel to the center axis of a flange portion of the holder body. One end of the pin is in contact with the eccentric cam, and the other end of the pin is in contact with a rear end face of a clamp sleeve which clamps a tool inserted into a chuck sleeve of the holder body.

Abstract: A chuck includes a holder body, a clamp sleeve, and a large number of needle rollers. The holder body has a shank portion, a flange, and a chuck sleeve. The clamp sleeve is fitted onto the outer circumference of the chuck sleeve such that the clamp sleeve is rotatable and axially movable relative to the chuck sleeve. The needle rollers are disposed between the chuck sleeve and the clamp sleeve over the entire circumference. The clamp sleeve is rotated to cause the needle rollers to revolve spirally along the outer circumferential surface of the chuck sleeve while rotating about their own axes in order to decrease and restore the diameter of the chuck sleeve. A thrust member is disposed between the end surface of the flange opposite the shank portion and a corresponding end surface of the clamp sleeve.

Abstract: In order to provide a tool holder which greatly reduces frictional resistance between a locknut and a taper collet, and eliminates a twisting of the taper collet during tightening of the locknut, in a tool holder comprising a locknut 13 which pushes a taper collet 12 into a tapered hole 115 of a collet chuck body 11 to chuck a cutting tool 15, between a reference end 123 of the tape collet 12 and a collet supporting portion 131 opposed thereto, interposed is a bearing washer 14 to reduce frictional resistance between both contact surfaces. To both surfaces of this bearing washer 14, namely, to the respective surfaces which come into contact with the reference end 123 and collet supporting portion 131, surface treatment by any of ion nitriding, DLC (Diamond-Like Carbon) coating, and TiN coating is applied.

Abstract: In order to provide a tool holder which greatly reduces frictional resistance between a locknut and a taper collet, and eliminates a twisting of the taper collet during tightening of the locknut, in a tool holder comprising a locknut 13 which pushes a taper collet 12 into a tapered hole 115 of a collet chuck body 11 to chuck a cutting tool 15, between a reference end 123 of the tape collet 12 and a collet supporting portion 131 opposed thereto, interposed is a bearing washer 14 to reduce frictional resistance between both contact surfaces. To both surfaces of this bearing washer 14, namely, to the respective surfaces which come into contact with the reference end 123 and collet supporting portion 131, surface treatment by any of ion nitriding, DLC (Diamond-Like Carbon) coating, and TiN coating is applied.

Abstract: A wrench includes a wrench body having a ring portion and a handle portion. A retainer that holds a plurality of wedge members at predetermined intervals in a circumferential direction of the ring portion is disposed inside the ring portion. Wedge guide grooves are formed on the inner circumferential surface of the ring portion to be arranged at intervals corresponding to those of the wedge members. Each of the wedge guide grooves has a free region which maintains the corresponding wedge member in a free state in which the wedge member moves freely between a bottom surface of the corresponding wedge guide groove and the outer circumferential surface of a fastening member, and left-hand and right-hand wedge regions each of which maintains the corresponding wedge member in a caught state in which the wedge member is caught between the bottom surface of the corresponding wedge guide groove and the outer circumferential surface of the fastening member.

Abstract: A tool holder includes a holder body which in turn includes a flange portion. A plurality of threaded holes are formed in the flange portion. A weight balance adjustment member(s) is removably screwed into an appropriate threaded hole(s). The adjustment member includes a coming-out prevention mechanism for preventing the same from coming out of the threaded hole. In another tool holder, weight balance adjustment members are removably screwed into all the threaded holes, each of the adjustment members includes a coming-out prevention mechanism for preventing the same from coming out of the threaded hole, and a detachment prevention member is provided on the outer circumferential surface of the flange portion in order to prevent detachment of the adjustment members.

Abstract: A tool holder is equipped with a tip run-out correction mechanism for correcting run-out of the tip of the tool. The tip run-out correction mechanism includes an annular stepped portion formed on a cylindrical support portion of a holder body; a ring member rotatably fitted onto the annular stepped portion; an eccentric cam disposed within the ring member, the eccentric cam extending radially through the ring member and being rotatable about a radially extending axis; and a pin disposed within the ring member to be movable along a direction parallel to the center axis of a flange portion of the holder body. One end of the pin is in contact with the eccentric cam, and the other end of the pin is in contact with a rear end face of a clamp sleeve which clamps a tool inserted into a chuck sleeve of the holder body.

Abstract: An end mill chucking structure for chucking an end mill having a relatively small diameter and used, for example, for deep milling of a die. The end mill chucking structure includes an end mill holder and an end mill. A holder body has a taper hole formed therein. The end mill includes an end mill body and a cutting tip provided at an end portion of the end mill body. A portion of the end mill body located opposite the cutting tip serves as a tapered shank portion. The shank portion and the rest of the end mill body are bounded by a shoulder extending outward from the surface of the shank portion. The shank portion is press-fitted or shrink-fitted into the taper hole such that the end face of the holder body abuts the shoulder of the end mill body, through application to the holder body of heat at a temperature lower than a conventional shrink-fitting temperature.

Abstract: A tool holder includes a holder body which in turn includes a shank portion, a flange portion, and a tool attachment portion; a taper cone fitted to the shank portion; an elastic member interposed between a rear-end face of the flange portion and a front-end face of the taper cone; and a stopper member disposed on the shank portion so as to support a rear-end face of the taper cone. The outer surface of the taper cone is tapered at an angle equal to that at which the wall surface of a taper hole formed in a spindle of a machine tool is tapered. The inner surface of the taper cone and the outer surface of the shank portion are equally tapered at an angle smaller than the angle at which the outer surface of the taper cone is tapered. Through drawing of the holder body, the taper cone expands radially to thereby be tightly held within the taper hole. A spacer is bonded to the end face of the spindle so as to eliminate a gap which is formed between the flange portion and a spindle.

Abstract: A tool holder includes a holder body which in turn includes a shank portion, a flange portion, and a tool attachment portion; a taper cone fitted to the shank portion; an elastic member interposed between a rear-end face of the flange portion and a front-end face of the taper cone; and a stopper member disposed on the shank portion so as to support a rear-end face of the taper cone. The outer surface of the taper cone is tapered at an angle equal to that at which the wall surface of a taper hole formed in a spindle of a machine tool is tapered. The inner surface of the taper cone and the outer surface of the shank portion are equally tapered at an angle smaller than the angle at which the outer surface of the taper cone is tapered. Through drawing of the holder body, the taper cone expands radially to thereby be tightly held within the taper hole. A spacer is bonded to the end face of the spindle so as to eliminate a gap which is formed between the flange portion and a spindle.

Abstract: A chuck includes a holder body, a clamp sleeve, and a large number of needle rollers. The holder body has a shank portion, a flange formed at one end of the shank portion, and a chuck sleeve that extends from the flange in the direction away from the shank portion. The clamp sleeve is fitted onto the outer circumference of the chuck sleeve such that the clamp sleeve is rotatable and axially movable relative to the chuck sleeve. The needle rollers are disposed between the chuck sleeve and the clamp sleeve over the entire circumference. The clamp sleeve is rotated to cause the needle rollers to revolve spirally along the outer circumferential surface of the chuck sleeve while rotating about their own axes in order to decrease and restore the diameter of the chuck sleeve. In the chuck, a groove having a predetermined depth is formed in the end surface of the flange opposite the shank portion such that the groove surrounds the base end of the chuck sleeve through which the chuck sleeve is joined with the flange.

Abstract: An article clamping apparatus is designed to compulsorily open the front end portions of divided pieces of a collet and to allow the divided pieces of the collet to securely hold a pull stud of a tool holder. A draw bar is fitted into a spindle of the machine tool, and a support sleeve is disposed to surround the draw bar via the collet. A separator is disposed on the front side of the support sleeve and fixed to the spindle together with the support sleeve. The positioning plates provided on the separator are engaged with slit grooves of the support sleeve and inserted between the divided pieces of the collet. Upon advancement of the draw bar, the divided pieces are advanced, so that the front end slat surfaces of the divided pieces contact the slant surfaces of the collet opening projections provided on the separator so as to compulsorily open the front portions of the divided pieces.

Abstract: A tool holder includes a sleeve to be fitted into a tapered bore of a main spindle of a machine tool, a shank portion inserted into the sleeve so as to be axially movable relative to the sleeve, a flange formed integrally with the shank portion which abuts an end face of the main spindle and an elastic device placed between the flange and the sleeve. The sleeve is formed with a slit which extends axially through a portion of the peripheral wall. The slit is provided with an elastic device.

Abstract: A tool holder has a main sleeve to be attached to a tapered bore of a spindle of a machine tool, and a subholder which is coupled with the main sleeve and to which a tool is attached. The tapered shank of the main sleeve is inserted into the tapered bore of the spindle having a taper of 7/24. The main sleeve has a tapered hole having a taper of 1/10. A tapered sleeve which is elastically deformable in the radial direction is fitted onto the outer circumference surface of a shank portion of a subholder body of the subholder. The subholder is coupled with the main sleeve such that the outer circumferential surface of the tapered sleeve having a taper of 1/10 intimately contacts the circumferential surface of the tapered hole and the rear end surface of a flange of the subholder body intimately contacts the forward end surface of the main sleeve. This structure prevents the generation of vibrations during machining.

Abstract: A clamp device is provided which is operable with extreme ease for clamping and unclamping a rotary shaft portion under remote control and which is capable of exerting a great clamping force and unlikely to displace the shaft axis. The clamp device includes a fixed sleeve (10) radially elastically deformable, rotatably supporting the shaft portion (7) and having a tapered surface (12) over a periphery thereof on the opposite side of a shaft supporting portion (11) thereof, a rotatable clamp member (17) having a tapered surface fitting to the sleeve tapered surface (12) with rollers (15) provided therebetween, the rollers being arranged as inclined with respect to the axis of the sleeve, and a drive unit (23) for rotating the clamp member.

Abstract: A clamp device is provided which is operable with extreme ease for clamping and unclamping a rotary shaft portion under remote control and which is capable of exerting a great clamping force and is unlikely to displace the shaft axis. The clamp device includes a fixed sleeve radially elastically deformable, rotatably supporting the shaft portion and having a tapered surface over a radially outer periphery, a rotatable clamp member having a tapered surface fitting to the sleeve tapered surface with rollers provided between the clamp member and the tapered surface the rollers being arranged as inclined with respect to the axis of the sleeve, and a drive unit for rotating the clamp member.