JP2009142940A - Rocking chuck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rocking chuck wherein a gripping pawl has reliable and smooth opening operation to allow easy mounting/demounting of a workpiece. <P>SOLUTION: With an increase in the sliding resistance of a movable part of the rocking chuck or in the load of the gripping pawl 32 due to an increase in the mass and with no need for each gripping pawl 32 to be opened up to a predetermined position, a thrust face 14b of a cam member 14 can thrust a protruded portion 28c which is formed with a curved face and provided on a jaw portion 28b of each pawl opening/closing member 28 to force the opening operation of each pawl opening/closing member 28, when a driving member 9 is moved forward. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a swing type chuck in which a gripping claw is gripped / released by swinging a claw opening / closing member having a gripping claw at its tip in the chuck radial direction.

  Conventionally, a plurality of claw opening / closing members pivotally supported by a support shaft are provided on the chuck body so as to be swingable in the chuck radial direction, and a gripping claw is attached to the tip of each claw opening / closing member, and is on the chuck axis of the chuck body. Each claw opening / closing member is moved in the chuck radial direction by the movement in the chuck axial direction of the driving member that supports the claw opening / closing member provided slidable back and forth and the biasing force of the operation member provided slidable on each claw opening / closing member. As a chuck that is swung to perform gripping / release operation of the gripping claw, for example, a swinging compensating chuck described in Non-Patent Document 1 and a chuck described in Japanese Patent Application No. 2007-118196 are known. ing.

“Toyo Kogyo Howa Power Chuck Catalog CAT.4053L”, Toyoka Industries Co., Ltd., P49

In the swing chuck described in Japanese Patent Application No. 2007-118196, the sliding force of each movable part such as the claw opening / closing member and the driving member, and the urging force by the operating member is insufficient due to an increase in load due to an increase in mass of the grasping claw. If the moving parts become stuck due to insufficient or deteriorated lubricating oil, dust generated due to rust or wear, etc. Since it was not opened, there was a risk of hindering the attachment / detachment of the workpiece. In particular, when a workpiece is automatically attached or detached by a robot or an autoloader, depending on the positioning accuracy of the robot or the autoloader, there is a possibility that the gripping claw and the workpiece may interfere with each other when the workpiece is attached, and the attachment becomes impossible. As a countermeasure against this, it is conceivable to increase the urging force by the actuating member. However, an increase in wear of both members due to an increase in contact surface pressure between the engaged portion of the claw opening / closing member and the cam surface of the driving member, Since it acts in a direction that hinders the gripping operation, the gripping force may be reduced, which is not preferable.
In view of the above-described problems, an object of the present invention is to provide a swing type chuck that can easily and easily attach and detach a work by reliably and smoothly opening a grasping claw.

  According to the present invention, a plurality of claw opening / closing members pivotally supported by a support shaft are provided on the chuck body so as to be swingable in the chuck radial direction, and a gripping claw is attached to the tip of each claw opening / closing member. Each claw opening / closing member is chucked by the movement in the chuck axial direction of the drive member provided slidable back and forth on the wire and the urging force of the operating member supporting the claw opening / closing member provided slidable on each claw opening / closing member. In a swing type chuck that swings in the radial direction to grip and release the gripping claw, the gripping claw is forcibly released by engagement of the claw opening / closing member and the drive member in the gripping claw opening operation means. It is characterized by having a function. (Claim 1)

  In the grasping claw forcibly opening means of the present invention, each claw opening / closing member has a jaw portion, and the jaw portion is pressed by a pressing surface provided on the driving member by moving the driving member in the chuck axial direction. The grasping claw attached to each claw opening / closing member is forcibly opened. (Claim 2)

  Moreover, the jaw part of the said nail | claw opening-and-closing member of this invention is provided with the convex part formed in the curved surface, It is characterized by the above-mentioned. (Claim 3)

According to the invention of claim 1 of the present application, the biasing force by the spring member is insufficient due to the sliding resistance of each movable part such as the claw opening / closing member, the driving member, or the load due to the increase in the mass of the grasping claw, Even if the movable part is stuck and the movable parts are fixed, the grasping claw by the engagement of the claw opening / closing member and the drive member as the thrust related to the grasping claw opening operation, in addition to the biasing force of the operating member Since the forcible opening means is provided, the grasping claw is reliably opened and the workpiece can be easily attached and detached.
Further, according to the invention of claim 2 of the present application, a jaw is formed on each claw opening and closing member, and the jaw is pressed by a pressing surface provided on the driving member by moving the driving member in the chuck axis direction, Since the grasping claws attached to the respective claw opening / closing members are forcibly opened, each grasping claw can be reliably opened.
According to the invention of claim 3 of the present application, since the jaw portion of the claw opening / closing member is provided with a convex portion formed with a curved surface, the grasping claw can be smoothly opened.

  Embodiments of the present invention will be described with reference to the drawings. A chuck body 2 of the oscillating chuck 1 (hereinafter referred to as “chuck 1”) includes a front body 3 and a back plate 4. The front body 3 and the back plate 4 each have a recessed inner central portion, and the rear portion of the front body 3 is closed by a back plate 4 by a mounting bolt (not shown), and a cylindrical inner space 5a and a rectangular interior are formed in the center. An internal space 5 consisting of a space 5b is formed. The cylindrical internal space 5a serves as a receiving portion for a cam member 14 which is a constituent member of a drive member 9 described later, and a plurality of (in the embodiment of the present invention) arranged radially at equal intervals around the circumference. Three rectangular internal spaces 5b are formed. The back plate 4 is provided with a seal member 6 at a fitting portion with the front body 3 to prevent intrusion of cutting fluid or the like from the outside and outflow of lubricating oil accumulated in the internal space 5.

  Support holes 7 and 8 are formed on the chuck axis CL of the front body 3 and the back plate 4, and the drive member 9 slides back and forth in the chuck axis CL direction across the support holes 7 and 8. It is installed freely. The drive member 9 includes a cylindrical member 10 having a flange portion 10a on the outer diameter and a stepped hole 10b on the inner side, a screw member 11, a nut member 12, a tightening member 13, and a cam member 14. Yes. The cam member 14 is sandwiched between the fastening member 13 and the flange portion 10a of the cylindrical member 10 so as to be slidable in the chuck radial direction on the outer periphery of the intermediate portion of the cylindrical member 10. An inclined cam surface 14 a that engages with the action portion 28 a of the rear end portion of the claw opening / closing member 28 is formed on the outer diameter of the cam member 14 to support the claw opening / closing member 28.

  In the large diameter hole 10c of the stepped hole 10b drilled on the chuck axis CL at the center of the cylindrical member 10, the support hole 7 drilled in the front body 3 is closed from the front surface of the front body 3. The guide member 15 is inserted, the stepped outer diameter portion 15 a is fitted into the front stepped hole 7 a of the support hole 7, and is fixed to the front body 3 with mounting bolts 16. A spring member 18 and a shaft member 19 urged forward in the direction of the chuck axis CL by its thrust force are slidably inserted into the receiving hole 17 formed on the chuck axis CL of the guide member 15. 19 is stopped by the end surface 21 a of the guide member 21 fixed to the guide member 15 with the mounting bolt 20, and the tip 19 a is guided by the through hole 21 b of the guide member 21. The shaft member 19 is the center 19 in the chuck provided to allow the workpiece W to be machined with reference to the center hole CH by inserting the tip end portion 19a into the center hole CH of the workpiece W. The cylindrical member 10 is rotated by a key 22 fitted to the guide member 15 so as to be slidable back and forth in the chuck axis CL direction.

  Sealing members 23 and 24 are interposed in the fitting portion between the guide member 15 and the front body 3 and the sliding portion of the shaft member 19 to prevent the ingress of cutting fluid and the like from the outside and the outflow of the lubricating oil inside. is doing. Further, a support hole 8 that is a fitting portion between the tightening member 13 and the back plate 4, a fitting portion between the tightening member 13 and the tubular member 10, and a support that is a fitting portion between the tubular member 10 and the front body 3. Seal members 25, 26, and 27 are also interposed in the hole 7 to prevent the lubricating oil from flowing out of the internal space 5.

  Three rectangular internal spaces 5 b arranged radially at equal intervals in the circumferential direction at the center of the front body 3 serve as receiving holes 29 for the claw opening / closing member 28. Each accommodation hole 29 includes an opening 30 provided to open forward. Each claw opening / closing member 28 is accommodated in each accommodation hole 29.

  Each claw opening / closing member 28 is pivotally supported by a support shaft 31 provided so as to cross the accommodation hole 29 formed in the front body 3 so as to be swingable in the chuck radial direction. A grasping claw 32 is fixed to the tip projecting from 30 with a mounting bolt 33. The rear end portion of each claw opening / closing member 28 is an action portion 28a that engages with the cam surface 14a. The gripping claw 32 is gripped by swinging the claw opening / closing member 28 inward in the chuck radial direction. In front of the action portion 28a of each claw opening / closing member 28, a jaw portion 28b provided with a convex portion 28c formed in a curved surface is formed.

  At the rear end of each claw opening / closing member 28, an operating member 34 that is biased toward the outside in the chuck radial direction by an internal spring member 36 is provided, and an action portion 28a at the rear end of each claw opening / closing member 28 is provided. It is pressed against the cam surface 14 a of the cam member 14 by the thrust of the spring member 36. The tip of the sliding member 35 of the operating member 34 is stopped by a screw member 37 screwed to the front body 3. When the cam member 14 moves forward by the action of the actuating member 34, the claw opening / closing member 28 swings outward in the chuck radial direction to open the grasping claw 32. In addition to the opening operation of the pawl opening / closing members 28, the actuating member 34 supports the center of the cam member 14 that is slidable in the chuck radial direction when the pawl opening / closing members 28 are opened on the chuck axis CL (centering). Function).

  A tip portion of each claw opening / closing member 28 is formed in a spherical portion 38, and a guide member 39 for guiding the spherical portion 38 of each claw opening / closing member 28 is inserted into the opening 30 of the accommodation hole 29. The guide member 39 includes a spherical inner peripheral surface 40 that can slide relative to the spherical portion 38 on the distal end portion side of the claw opening / closing member 28. The opening 30 of the accommodation hole 29 and the fitting portion of the guide member 39 and the sliding portion between the inner peripheral surface 40 of the guide member 39 and the spherical portion 38 of the claw opening / closing member 28 enter the cutting fluid or the like from the outside. In addition, seal members 41 and 42 for preventing the lubricating oil from flowing out from the internal space 5 are interposed.

  The chuck 1 configured as described above is fixed to the front end of the main shaft portion 44 such as a lathe by a mounting bolt 43 provided on the chuck main body 2 so that the chuck main body 2 rotates with the rotation of the main shaft portion 44. The drive member 9 is connected via a connecting rod 45 to a piston (not shown) of a rotary cylinder (not shown) installed at the rear end of the main shaft portion 44, and the drive member 9 is moved in the chuck axis CL direction by the operation of the piston. It is designed to move back and forth.

  The grasping / releasing operation of the grasping claw 32 will be described. Each gripping claw 32 is gripped by operating the piston to retract the drive member 9, so that the action portion 28 a of each claw opening / closing member 28 rotates around the support shaft 31 on the cam surface 14 a of the cam member 14. As a result, the claw opening / closing members 28 are swung and the grasping claws 32 are moved inward in the chuck radial direction. Each grasping claw 32 grasps the workpiece W and the grasping operation of the grasping claw 32 is completed in the state shown in FIG.

  Each grasping claw 32 is opened by operating the piston to advance the drive member 9. When the drive member 9 is advanced, the cam surface 14a of the cam member 14 is separated from the action portion 28a of each claw opening / closing member 28, and the driving force of the piston is cut off. As the cam surface 14a advances, the action portion 28a of the claw opening / closing member 28 is rotated about the support shaft 31 by the urging force of the operating member 34 and is pushed down inward in the chuck radial direction, and each claw opening / closing member 28 swings. The grasping claw 32 moves outward in the chuck radial direction. Further, the drive member 9 that has advanced further has the flange portion 10a of the cylindrical member 10 stopped at the inner end surface 3a of the front body 3, and the opening operation of the grasping claw 32 is completed in the state shown in FIG.

  As shown in FIG. 4, the chuck 1 is moved forward by the drive member 9 even if the urging force of the actuating member 34 is insufficient or the claw opening / closing member 28 is stuck and each grasping claw 32 is not opened to a predetermined position. The pressing surface 14b of the cam member 14 presses the convex portion 28c of the jaw portion 28b formed on each claw opening / closing member 28 to forcibly swing each claw opening / closing member 28 so that each grasping claw 32 opens. It is like that.

The chuck 1 configured as described above can surely open the gripping claws 32 to a predetermined position, so that the workpiece W can be easily attached and detached, and the attachment and removal work can be performed efficiently. In particular, when a long workpiece is automatically attached or detached by a robot or autoloader, automation is easy because it does not require high positioning accuracy of the robot or autoloader.
Moreover, since the convex part 28c of the jaw part 28b formed in each nail | claw opening / closing member 28 is formed in the curved surface, it can be made to line-smoothly with the press surface 14b of the cam member 14 to contact | abut, and the grasping nail | claw 32 Can be smoothly opened.
Moreover, since the solution of this embodiment is a simple structure, it can be implemented at low cost.

The convex portion 28c formed of a curved surface may be integrally formed with the claw opening / closing member 28 as in this embodiment, or may be fixed to the jaw portion 28b formed on the claw opening / closing member 28 as a separate body. Good. By doing so, it becomes possible to divert and use the claw opening / closing member 28 of the existing swing chuck, which is economical.
Further, the convex portion 28c formed with a curved surface may be provided as a pressed portion on the jaw portion 28b formed on the claw opening / closing member 28 as in the present embodiment, or the jaw portion 28b may be a flat surface, You may provide in the press surface 14b of a certain cam member 14. FIG.

It is a front view of the chuck | zipper which shows embodiment of this invention. It is the II-II sectional view taken on the line of FIG. 1, and the figure which showed the holding | grip state of the grasping nail | claw. It is the II-II sectional view taken on the line of FIG. 1, and the figure which showed the open state of the grasping nail | claw. It is the II-II sectional view taken on the line of FIG. 1, and the figure which showed the state by which the grasping nail | claw is not open | released to a predetermined position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chuck 2 Chuck main body 9 Drive member 14b Press surface 28 Claw opening / closing member 28b Jaw part 28c Convex part 31 Supporting shaft 32 Grasp claw 34 Actuating member CL Chuck axis W Workpiece CH Center hole

Claims (3)

A plurality of claw opening / closing members pivotally supported by a support shaft are provided on the chuck body so as to be swingable in the chuck radial direction. A gripping claw is attached to the tip of each claw opening / closing member, and slides back and forth on the chuck axis of the chuck body. Each claw opening / closing member is swayed in the chuck radial direction by the movement of the driving member supporting the claw opening / closing member movably provided in the chuck axial direction and the biasing force of the operation member slidably provided on each claw opening / closing member. In the swing type chuck that moves and moves the grasping claw, the grasping claw opening operation means has a grasping claw forcibly opening function by engaging the claw opening / closing member and the drive member. A swing type chuck characterized by that. The grasping claw forcibly opening means forms a jaw on each claw opening / closing member, and presses the jaw with a pressing surface provided on the driving member by movement of the driving member in the chuck axis direction. 2. The swing chuck according to claim 1, wherein the grasping claw attached to the forcible is forcibly opened. The swing chuck according to claim 2, wherein the jaw portion of the claw opening / closing member is provided with a convex portion formed of a curved surface.

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