JP2009050973A - Chuck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chuck easily exchanging a holding claw in the front of the chuck and bringing no accuracy deterioration caused by holding force and centrifugal force. <P>SOLUTION: A connecting groove 15 is arranged on a parent claw 10 so as to be released forward and to incline outside the radial direction of the chuck in proportion as it goes in the front of an axis L of the chuck against a holding claw mounting surface 14. A connection section 26 of an fastening body 16 is slidably connected with the connecting groove 15, and a connecting groove 30 of the holding claw 13 is connected with a holding claw connection section 27 of the fastening body 16 parallel to the axis L of the chuck. A bolt head 20 is connected with a connecting recessed section 21 of the parent claw 10, and the fastening body 16 is slantly moved forward by turning a fastening bolt 17 engaged with the fastening body 16 from the front of the chuck, so that the holding claw 13 is press-fitted onto the holding claw mounting surface 14 of the parent claw 10. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides an engaging groove inclined with respect to the grasping claw mounting surface of the parent nail on the parent nail or the grasping nail so that the fastening body can be moved between the engagement groove of the parent nail and the engaging groove of the grasping nail. The present invention also relates to a chuck in which a grasping claw is pressed against a grasping claw mounting surface of a parent nail.

  Conventional chucks are disclosed in Patent Document 1 and Patent Document 2. In the chuck of Patent Document 1, the master jaw (parent claw) is provided with a T-shaped slot (engagement groove) parallel to the support surface (gripping claw mounting surface) along the chuck radial direction of the master jaw, and the top jaw (gripping). The claw is provided with a T-shaped slot (engagement groove) inclined with respect to the support surface. A clamping nut (clamping body) is engaged with the T-shaped slots of the master jaw and the top jaw. An operating screw (clamping bolt) is screwed into the tightening nut, and a flange of the operating screw is engaged with the master jaw. When the operating screw is turned, the tightening nut moves along the T-shaped slot of the top jaw, so that the top jaw is pressed against the support surface by the tightening nut. When crimped, the top jaw is held radially by a stop formed in the master jaw.

  Further, in the chuck of Patent Document 2, a guide groove (engagement groove) extending in the chuck radial direction is provided on the basic jaw (parent claw) at an appropriate angle with respect to the end surface of the basic jaw along the chuck radial direction. There is a guide groove along the radial direction of the chuck in the upper jaw (holding claw). A clamp strip (clamping body) is engaged with each guide groove. A position adjusting screw (clamping bolt) is screwed into the base jaw portion in parallel with the guide groove of the base jaw portion, and a shaft band of the position adjusting screw is inserted into a space in the clamp strip. By tightening the position adjustment screw, the clamp strip moves along the guide groove of the basic jaw, and the teeth of the upper jaw are pressed against the end face of the basic jaw, so that the upper jaw is pressed. Yes.

JP 61-4607 A Japanese Patent Laid-Open No. 3-60904

  In the device described in Patent Document 1, the gripping claw is held in the chuck radial direction by the stop of the parent claw, but the holding portion of the gripping claw by the stop is very small and is supported by the tightening body along the chuck radial direction of the parent claw. If the gripping claw is loosely pressed onto the surface, the gripping claw will not be held by the stop, and the gripping force or centrifugal force acting on the gripping claw will act to remove the gripping claw in the chuck radial direction. There is a risk of coming off the nail. In the case of the one described in Patent Document 2, when the tightening bolt is loose, the contact between the tooth portion of the support surface and the tooth portion of the grasping claw along the radial direction of the chuck of the parent nail is released, and the grasping force Since the centrifugal force acts in the chuck radial direction, there is a possibility that the grasping claw may come off from the parent nail. In addition, in the cases described in Patent Documents 1 and 2, the gripping claw is engaged / disengaged and the tightening bolt is rotated from the chuck radial direction, so that the gripping claw can be replaced only from the front of the chuck. The gripping claw replacement work cannot be easily performed. Moreover, in the thing of patent document 2, although the clamping force which goes to the chuck | radius inward direction of a chuck | zipper radius acts on a clamping body, it grasps | bonds a grasping nail | claw to a parent nail, but grasps | ascertains a workpiece | work. The gripping force and centrifugal force at the time of operation act on the outer side in the chuck radial direction opposite to the tightening force. For this reason, a force in the chuck radial direction acts on the gripping claw, and the gripping claw tends to move outward in the chuck radial direction with respect to the parent claw.

  Therefore, the present invention has been made in view of the above problems, and even when the tightening bolt is loose, there is no fear that the grasping claw will come off from the parent nail, and the grasping claw can be easily replaced from the front of the chuck. It is intended to provide a chuck whose grasping accuracy does not deteriorate even by force or centrifugal force.

  In order to achieve the above object, according to the first aspect of the present invention, the chuck main body is provided with a plurality of master claws so as to be movable in the radial direction, the parent claws and the gripping claws are provided with respective engaging grooves, and one of the engagements is provided. A gripping claw in which a groove is provided to be inclined with respect to the other engagement groove and the gripping claw mounting surface, and a tightening body slidably engaged with the engagement groove of the parent claw is applied to the gripping claw mounting surface In the chuck that is engaged with the engaging groove of the main claw and moves the tightening body to be inclined with respect to the grasping claw mounting surface to press the grasping claw to the grasping claw mounting surface of the parent nail, The mounting surface is composed of an inner peripheral surface along the chuck axis, and the engagement groove of the parent claw is inclined so as to go radially outward toward the chuck front with respect to the grasping claw mounting surface, and the engagement of the parent nail A tightening body that is provided with a screw hole parallel to the engagement groove from the front side in the tightening body engaged with the groove, and a screw portion is screwed into the screw hole of the tightening body on the parent nail. The bolt head of the bolt can be rotated and an engagement recess for restricting movement in the direction of the engagement groove is provided, and the screw portion of the tightening bolt with the bolt head engaged with the engagement recess is the screw hole of the tightening body. The gripping claw is engaged with the fastening body engaged with the engagement groove of the parent claw, the bolt head of the fastening bolt is rotated from the front of the chuck, and the fastening body is moved with respect to the chuck axis. The gripping claw is moved obliquely forward and is crimped to the gripping claw mounting surface of the parent claw.

  According to a second aspect of the present invention, a retaining member for preventing the tightening body from moving backward is provided at the position where the screw hole of the tightening body is detached from the threaded portion of the tightening bolt. It is characterized by being.

  The invention according to claim 3 moves the grasping claw in the chuck axis direction by moving the grasping claw engaged with the tightening body in the radially outward direction and applying it to the grasping claw mounting surface of the parent claw. The regulation part which regulates is provided in the parent nail.

  According to a fourth aspect of the present invention, an engagement groove having a T-shaped cross section is provided at the center of the inner side surface of the parent claw so as to open forward, and the T is slidably fitted into the engagement groove in the fastening body. An engagement part with a letter-shaped cross section is provided, a gripping claw engagement part with a T-shaped section in the chuck rotation axis direction is provided at the inner end of the clamping body, and a clamping claw engagement of the clamping body is provided at the center of the outer peripheral surface of the clamping claw An engagement groove having a T-shaped cross section that is slidably fitted from the front of the chuck is provided at the joint.

  In the invention of claim 1 of the present application, the grasping claw mounting surface of the parent claw is constituted by an inner peripheral surface in a direction along the chuck axis, and the radius of the engagement groove of the parent claw moves toward the front of the chuck with respect to the grasping claw mounting surface. A screw hole parallel to the engagement groove is provided from the front side in the tightening body that is inclined outwardly and is engaged with the engagement groove of the parent claw, and the thread portion is provided in the screw hole of the tightening body in the parent nail. An engagement recess is provided that can turn the bolt head of the tightening bolt to be screwed and restricts movement in the direction of the engagement groove, and tightens the screw portion of the tightening bolt with the bolt head engaged with the engagement recess. The gripping claw is engaged with the fastening body that is screwed into the screw hole of the attachment body, and is engaged with the engagement groove of the parent claw, the bolt head of the fastening bolt is rotated from the front of the chuck, and the fastening body is Since the gripping claw is moved to the front side of the chuck axis to be crimped to the gripping surface of the gripping claw of the parent claw, the bolt head of the tightening bolt is chucked. The tightening body rotationally operated from the front is moved in the radial direction, the replacement of grasping claws simply quickly and easily disengage the grasping claws to clamping member from the front. In addition, the gripping claw is crimped to the gripping claw mounting surface by moving the tightening body obliquely forward with respect to the chuck axis, so that the gripping force and centrifugal force acting on the gripping claw press the gripping claw to the gripping claw mounting surface. Thus, it is possible to increase the accuracy of grasping the workpiece by the grasping claw. Also, the threaded portion of the tightening bolt engaged with the engaging recess of the parent claw in the threaded hole of the tightening body engaged with the engaging groove inclined in the radially outward direction toward the chuck forward. , So that the fastening body can be prevented from being detached from the engagement groove by a grasping force, a centrifugal force, or the like.

Further, in the invention of claim 2 of the present application, a retaining member for preventing the fastening body from moving backward to a position where the screw hole of the fastening body is detached from the screw portion of the fastening bolt can be attached to and detached from the parent nail. Since the rearward movement of the tightening body is prevented by the retaining member, it is possible to prevent the screw hole of the tightening body from being detached from the threaded portion of the tightening bolt. It can be engaged with and disengaged from the tightening body, and the gripping claw can be easily replaced. Further, the fastening body and the fastening bolt can be detached from the parent nail in the detached state of the retaining member.
In the invention of claim 3 of the present application, the gripping claw engaged with the tightening body is moved radially outward and applied to the gripping claw mounting surface of the parent claw, thereby moving the gripping claw in the chuck axis direction. Since the restricting portion to be controlled is provided on the parent nail, the grasping claw engaged with the tightening body can be prevented from coming off from the tightening body, and the grasping performance can be maintained while maintaining the posture of the grasping nail.
In the invention of claim 4 of the present application, an engagement groove having a T-shaped cross section is provided at the center of the inner surface of the parent claw so as to open forward, and the T is slidably fitted into the engagement groove in the fastening body. An engagement part with a letter-shaped cross section is provided, a gripping claw engagement part with a T-shaped section in the chuck rotation axis direction is provided at the inner end of the clamping body, and a clamping claw engagement of the clamping body is provided at the center of the outer peripheral surface of the clamping claw Since the engagement groove with a T-shaped cross section that fits slidably from the front of the chuck is provided at the joint, the center part of the inner surface of the parent claw is attracted by the tightening body and is uniformly pressed against the outer peripheral surface of the grasping claw And the position of the grasping claw can be stabilized.

  Next, an embodiment of the present invention will be described with reference to FIGS. In the chuck 1, the chuck body 2 includes a chuck body 3 and a front cover 4. A drive member 6 is fitted in the internal space 5 of the chuck body 3 so as to be slidable in the chuck axis L direction. The chuck body 3 is formed with a plurality of (four in the present embodiment) insertion holes 7 at equal intervals in the circumferential direction. A plurality of claw guide grooves 8 extending in the chuck radial direction at equal intervals in the circumferential direction are formed in the front cover 4 so as to correspond to the insertion holes 7 of the chuck body 3. A fitting portion 9 of the driving member 6 protrudes from the insertion hole 7 in the claw guide groove 8. A parent claw 10 is slidably fitted in the claw guide groove 8.

  The parent claw 10 is provided with a wedge groove 11 that is inclined so as to go outward in the chuck radius (hereinafter referred to as diagonally forward) toward the front side of the chuck axis L in a portion outside the chuck radius. A wedge portion 12 formed in the fitting portion 9 of the drive member 6 is slidably engaged with the wedge groove 11. Further, in the parent claw 10, an inner peripheral surface in a direction along the chuck axis L in the chuck radius inner direction is configured as a grasping claw mounting surface 14 on which the grasping claw 13 is crimped. The parent claw 10 has an engagement groove 15 having a T-shaped cross section formed in the central portion of the inner peripheral surface, and the engagement groove 15 is formed in parallel with the wedge groove 11, and obliquely forward. It is inclined and opened to the front surface of the parent nail 10. A tightening bolt 17 to be described later is rotated from the opening 15a of the engagement groove 15. Since the engagement groove 15 and the wedge groove 11 are formed in parallel, the chuck 1 can be reduced in size.

  Further, as shown in FIG. 2, a retaining member 18 for preventing the later-described tightening body 16 from moving backward from the chucking axis L to a position where the tightening body 16 is detached from the tightening bolt 17 as shown in FIG. It is provided. The retaining member is a retaining bolt 18, which is screwed onto the parent claw 10 from the chuck radius inward direction to the rearward portion of the chuck axis L at the center of the inner peripheral surface, and the retaining bolt head 19 is tightened. 16 movements are restricted. In addition, the bolt head 20 of the tightening bolt 17 is engaged in the forward direction of the chuck axis L at the center of the inner peripheral surface of the parent claw 10, and the bolt head 20 of the tightening bolt 17 is rotatable and engaged. An engagement recess 21 for restricting movement in the direction of the groove 15 is formed as shown in FIGS. A fastening body 16 is provided in the engagement groove 15 of the parent claw 10 so as to be movable between the retaining bolt 18 and the engagement recess 21. In addition, rear restricting portions 22 and 23 are formed in the front and rear direction portion of the chuck claw L of the parent claw 10 before projecting inward in the chuck radius. The front and rear restricting portions 22 and 23 move the gripping claws 13 engaged with the tightening body 16 to the gripping claw mounting surface 14 of the parent claw 10 when moving the gripping claws 13 outward in the chuck radius direction. The front and rear end surfaces 24 and 25 in the longitudinal direction of the axis L are brought into slidable contact with each other, and the movement of the grasping claw 13 in the longitudinal direction of the chuck axis L is restricted.

  As shown in FIGS. 2 and 4, the tightening body 16 has an engaging portion 26 having a T-shaped cross section that is slidably fitted into the engaging groove 15 of the parent nail 10 at the outer end in the chuck radius direction. It is formed in parallel with the joint groove 15. Further, the clamping body 16 is fitted in the engagement groove 15 of the parent claw 10, and a grasping claw engagement portion 27 having a T-shaped cross section parallel to the chuck axis L is formed at the inner end portion in the chuck radius direction. ing. A screw hole 28 is formed in the tightening body 16 in parallel with the engaging groove 15 of the parent claw 10 from the front side of the chuck axis L. A screw portion 29 of the tightening bolt 17 is screwed into the screw hole 28.

  The fastening body 16 is directed toward the fastening bolt 17 in which the bolt head 20 is engaged with the engaging recess 21 of the parent claw 10, and the engagement groove 15 of the parent claw 10 from the rear side to the front side of the chuck axis L. The engaging portion 26 of the tightening body 16 is engaged with the screw hole 28 of the tightening body 16, and the screw portion 29 of the tightening bolt 17 is screwed into the screw hole 28 of the tightening body 16. The screwed fastening bolt 17 is rotated in the direction of fastening to the fastening body 16 from the opening 15a in front of the chuck 1, and the fastening body 16 is moved along the engagement groove 15 of the parent claw 10 with respect to the chuck axis L. By moving diagonally forward, the fastening body 16 is engaged with the parent claw 10. The engaged tightening body 16 has a chuck axis L at a position where the screw hole 28 of the tightening body 16 is disengaged from the threaded portion 29 of the tightening bolt 17 when the retaining bolt 18 is screwed into the parent claw 10. Movement in the rearward direction is prevented so that it does not normally come off the parent nail 10.

  As shown in FIG. 5, the grasping claw 13 can slide from the front of the chuck to the grasping claw engaging portion 27 of the tightening body 16 at the center portion of the abutting surface 31 of the chuck radius that contacts the grasping claw mounting surface 14. An engagement groove 30 having a T-shaped cross section is provided to be fitted into the. The engaging groove 30 of the grasping claw 13 is formed along the chuck axis L as shown in FIG. The grasping claw 13 is formed with a step portion 32 at the front portion of the chuck axis L of the contact surface 31 in the chuck radius outward direction. The front end surface 24 and the rear end surface 25 of the step portion 32 of the grasping claw 13 are front and rear movement restricting surfaces in the chuck axis L direction, and the front and rear movement restricting surfaces 24 and 25 fasten the grasping claws 13 to the tightening body. 16 is engaged with the gripping claw mounting surface 14 of the parent claw 10 when it is moved outwardly from the chuck radius and slidably contacts the restricting portions 22 and 23 of the parent claw 10, and the gripping claw 13 is moved in the chuck axis L direction. The movement is regulated.

  Next, the replacement operation of the gripping claws 13 of the chuck 1 will be described. First, the removal of the grasping claw 13 will be described. The clamping bolt 17 is rotated from the opening 15a in front of the chuck 1 in the direction of loosening from the clamping body 16, and the clamping body 16 moves in the chuck radius inward while moving the clamping body 16 in the rearward direction of the chuck axis L along the engagement groove 15. (Hereinafter, this moving direction is referred to as diagonally rearward), and the rear end surface of the fastening body 16 is brought into contact with the retaining bolt 18. As shown in FIG. 6, when the tightening body 16 is in contact with the retaining bolt 18, the grasping claw engaging portion 27 of the tightening body 16 moves in the chuck radius direction, so The front end face 24 is disengaged from the front restricting portion 22 of the parent nail 10. In this state, the grasping claw 13 is separated from the parent claw 10 by pulling the grasping claw 13 forward in the chuck axis L (FIG. 7). Next, attachment of the grasping claw 13 will be described. In order to newly attach the grasping claw 13, as shown in FIG. 7, the grasping claw engaging portion 27 is engaged with the engagement groove 30 of the new grasping claw 13 from the front of the chuck axis L, and The grasping claw 13 is moved along the grasping claw engaging portion 27 until the rear movement restricting surface 25 comes into contact with the rear restricting portion 23 of the parent claw 10. Next, the fastening bolt 17 is rotated from the front direction of the chuck axis L in the direction of fastening the fastening bolt 17 to the fastening body 16. By tightening the tightening bolt 17, the tightening body 16 moves obliquely forward along the engaging groove 15 of the parent claw 10, and the grasping claw engaging portion 27 moves along the engaging groove 15. The grasping claw 13 is moved outward from the chuck radius.

  Since the engaging portion 26 and the gripping claw engaging portion 27 of the tightening body 16 are inclined so as to open relatively toward the front of the chuck axis L, the chuck axis when the tightening body 16 moves obliquely forward. The grasping claw engaging portion 27 moves to the outside of the chuck radius with respect to L, and the grasping claw 13 is guided by the front and rear regulating portions 22 and 23 and contacts the grasping claw mounting surface 14. At this time, the front and rear movement restricting surfaces 24 and 25 are fitted in the front restricting portions 22 and 23 in front of the parent claw 10 and the front and rear movement restricting surfaces 24 and 25 in the chuck axis L direction. In the state where the movement to the front is regulated, the front and rear regulating parts 22 and 23 slide in the chuck radius outward direction, and the gripping claw 13 moves in the chuck radius L direction while the movement in the chuck axis L direction is regulated. Is done. Since the grasping claw 13 is restricted from moving in the direction of the chuck axis L, the grasping claw 13 is prevented from being detached from the tightening body 16, and the gripping performance can be maintained while maintaining the posture of the grasping claw 13.

  When the tightening bolt 17 is further rotated and tightened to the tightening body 16, the grasping claw 13 is crimped to the grasping claw mounting surface 14 by moving the tightening body 16 obliquely forward. When the workpiece is grasped in this state, the reaction force from the workpiece acts on the grasping claw 13 in the outward direction of the chuck radius, and a centrifugal force acts at the time of rotation. Therefore, the workpiece grasping accuracy can be increased. Moreover, since the contact surface 31 of the grasping claw 13 can be uniformly pressed against the grasping claw mounting surface 14 of the parent claw 10 by the tightening body 16, the position of the grasping claw 13 can be stabilized.

  When the grasping claw 13 is separated from the parent claw 10 for replacement, the fastening body 16 is prevented from being detached from the fastening bolt 17 by the retaining bolt 18. Since the attached bolt 17 is not removed from the chuck 1, the gripping claw 13 can be easily replaced. As described above, the gripping claw 13 can be easily replaced by rotating the clamping bolt 17 from the front of the chuck and moving the fastening body 16 in the chuck radial direction so that the gripping claw 13 can be easily engaged and disengaged from the front of the chuck. It can be done quickly.

It is a front view which shows the chuck | zipper of this invention. It is the II-II sectional view taken on the line of FIG. It is a front view of a parent nail. It is a front view of a fastening body. It is a top view of a grasping nail. It is a figure which shows the movement state of the holding | grip nail | claw in the chuck | zipper radius inward by the movement of a fastening body. It is explanatory drawing which shows attachment / detachment of a grasping nail | claw.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chuck 2 Chuck main body 10 Parent nail 13 Grasp claw 14 Grasping claw mounting surface 15 Parent nail engagement groove 16 Tightening body 17 Tightening bolt 18 Retaining member 20 Bolt head 21 Engaging recess 22, 23 Restriction part 26 Engagement Part 27 Grasp claw engaging part 28 Screw hole 29 Screw part 30 Grab claw engagement groove L Chuck axis

Claims (4)

A plurality of parent claws are provided in the chuck body so as to be movable in the radial direction, and an engagement groove is provided in each of the parent claw and the grasping claw, and one engagement groove is inclined with respect to the other engagement groove and the grasping claw mounting surface. The clamping body that is slidably engaged with the engaging groove of the parent claw is engaged with the engaging groove of the grasping claw applied to the grasping claw mounting surface, and the clamping body is engaged with the grasping claw mounting surface. In the chuck in which the grasping claw is crimped to the grasping claw mounting surface of the parent claw by moving it incline with respect to the parent claw, the grasping claw mounting surface of the parent nail is configured by an inner peripheral surface in a direction along the chuck axis. The engaging groove of the claw is inclined so as to go outward in the radial direction toward the chuck front with respect to the gripping claw mounting surface, and is parallel to the engaging groove from the front side to the fastening body engaged with the engaging groove of the parent claw. Provided with a screw hole, the bolt head of the tightening bolt that can be screwed into the screw hole of the tightening body on the parent nail can be rotated and moved in the direction of the engaging groove. A tightening bolt that is provided with an engaging recess to be engaged, and a screw portion of a tightening bolt having a bolt head engaged with the engaging recess is screwed into a screw hole of a tightening body and is engaged with an engaging groove of a parent nail. The gripping claw is engaged with the body, the bolt head of the tightening bolt is turned from the front of the chuck, and the clamping body is moved obliquely forward with respect to the chuck axis to crimp the gripping claw to the gripping claw mounting surface of the parent claw. A chuck characterized in that 5. A retaining member for preventing the fastening body from moving backward at a position where the screw hole of the fastening body is detached from the threaded portion of the fastening bolt is detachably provided on the parent nail. The chuck according to 1. By moving the gripping claw engaged with the tightening body to the outside of the radius and applying it to the gripping claw mounting surface of the parental claw, a regulating part is provided on the parental claw that regulates the movement of the gripping claw in the chuck axis direction. The chuck according to claim 1 or 2, wherein An engagement groove having a T-shaped cross section is provided at the center of the inner surface of the parent claw so as to open forward, and an engagement portion having a T-shaped cross section that is slidably fitted into the engagement groove is provided on the fastening body. A gripping claw engagement part with a T-shaped cross section in the chuck rotation axis direction is provided at the inner end of the clamping body, and can be slid from the front of the chuck to the clamping claw engagement part of the clamping body at the center of the outer peripheral surface of the clamping claw The chuck according to any one of claims 1 to 3, further comprising an engagement groove having a T-shaped cross section that is fitted to the chuck.

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