JP2011167821A - Chuck device and claw member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chuck device and claw member for exchanging a claw relatively easily for a short time while preventing displacement of a workpiece. <P>SOLUTION: The claw member provided at the chuck device includes: a claw body 5 having a dovetail form 10 extending toward a rotating shaft of a stage, a first claw fixing member 6 that configures one end face (15a) of a dovetail groove corresponding to the dovetail form 10, and is fixed to a sliding member to reciprocate with the sliding member, and a second claw fixing member 7 that configures the other end face (16a) of the dovetail groove that is symmetric to one end face (15a), and is fixed to the first claw fixing member 6 by a screw member 18. When the screw member 18 is tightened, distance between one end face (15a) and the other end face (16a) is shortened. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a chuck device and a claw member for sandwiching and fixing a workpiece.

  In general, a machine tool (for example, a lathe) for cutting a workpiece includes a chuck device for fixing the workpiece, and the workpiece is clamped by a plurality of claw members (jaws) provided in the chuck device. The position is fixed. As a conventional chuck device, for example, a chuck device 20 described in Patent Document 1 shown in FIG. 6 is known.

  The chuck device 20 includes a cylindrical stage 21, a sliding member 22 (master jaw) that is provided on the stage 21 and is movable in the radial direction, a T-nut 23 fitted to the sliding member 22, and a T-nut 23. And a claw 24 (top jaw) fitted into the. As shown in the figure, the chuck device 20 includes three sets of a sliding member 22, a T-nut 23, and a claw 24, and clamps a workpiece between the inner ends of the three claws 24. In FIG. 6, one illustration of each of the T nut 23 and the claw 24 is omitted.

  FIG. 7 is a view of the sliding member 22, the T nut 23, and the claw 24 as viewed from the outer peripheral surface side of the stage 21. As shown in the figure, in the chuck device 20, when the screw 25 is tightened, the claw 24 and the T-nut 23 are fixed via the screw 25, and the sliding member 22 pulled up by the head of the T-nut 23. And the claw 24 come into contact with each other on the serrated surfaces 26 and 27, and the sliding member 22, the T-nut 23 and the claw 24 are fixed integrally.

JP 2000-288809 A

  By the way, in the field of the chuck device, the shape of the inner end of the claw 24 is usually processed according to the shape and size of the workpiece in order to fix the workpiece more stably. That is, before cutting the workpiece, the claw 24 is generally removed, processed, attached, checked whether it can be stably fixed, removed, reprocessed, and so on. In addition, today, when the production of a small quantity and a wide variety of products has become mainstream, it is necessary to frequently replace the claws 24 in accordance with the type of workpiece.

  However, in the conventional chuck device 20, the claw 24 and the T-nut 23 (sliding member 22) are firmly fixed by a plurality of screws 25 in order to prevent displacement of the workpiece. It was very time consuming and laborious to perform repeatedly.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a chuck that can replace a claw relatively easily and in a short time while preventing displacement of a workpiece. The object is to provide a device and a claw member.

In order to solve the above-described problems, a chuck device according to the present invention includes a stage that can rotate around a rotation axis, and a plurality of sliding members that are provided on the stage and can reciprocate along a direction toward the rotation axis. Each of the plurality of sliding members, and a plurality of claw members that move together with the sliding member, and a chuck device that clamps a workpiece with the plurality of claw members,
The claw member comprises (a) a claw body having a dovetail shape extending in a direction toward the rotation axis, and (b) one end surface of a dovetail groove corresponding to the dovetail shape, and fixed to the sliding member. A first claw fixing member; and (c) a second claw fixing member that constitutes the other end surface of the dovetail symmetric with the one end surface and is fixed to the first claw fixing member with a screw member,
When the screw member is tightened, the distance between the one end face and the other end face is narrowed.

  According to this configuration, the claw body can be slid along the dovetail and removed by slightly loosening the screw member and slightly increasing the distance between the one end and the other end (width of the dovetail). . Moreover, when attaching a nail | claw main body, it is only necessary to slide and insert the dovetail | claw type | mold of a nail | claw main body in the dovetail groove | channel of the state slightly expanded, and to tighten a screw member. That is, according to this structure, replacement | exchange of a nail | claw main body can be performed easily and for a short time.

  In the chuck device, the first claw fixing member has a protrusion that restricts the claw body from moving in a direction away from the rotation shaft, and the protrusion and the claw body have a flat inclined surface for contacting each other. It is preferable that both the inclined surface of the claw body and the inclined surface of the protruding portion are inclined by a predetermined angle so as to move away from the rotation axis as moving away from the sliding member.

  In this configuration, when the screw member that fixes the first claw fixing member and the second claw fixing member is tightened, when the force toward the first claw fixing member acts on the nail body, the claw body is an inclined surface of the protruding portion. The position of the nail body is finely adjusted in the direction toward the rotation axis while sliding down. Therefore, according to this structure, the nail | claw main body can be positioned with high precision and the position shift of a workpiece can be prevented.

  In the chuck device, the claw body has a first clamping surface and a second clamping surface for clamping the fixing member, and the distance from the rotation axis can be changed between the first clamping surface and the second clamping surface. .

  According to this configuration, since the nail body has a plurality of clamping surfaces having different distances from the rotation axis, it is possible to fix different workpieces of different varieties without replacing the nail body.

In order to solve the above-described problem, a claw member according to the present invention includes a stage that can rotate around a rotation axis, and a plurality of slides that are provided on the stage and that can reciprocate along a direction toward the rotation axis. In the chuck device provided with a moving member, a claw member that is provided on each of the plurality of sliding members and moves together with the sliding member to sandwich the workpiece,
(A) a claw body having a dovetail extending in a direction toward the rotation axis; and (b) a first claw fixing member that constitutes one end surface of a dovetail groove corresponding to the dovetail and is fixed to the sliding member; (C) a second claw fixing member that constitutes the other end surface of the dovetail symmetric with the one end surface and is fixed to the first claw fixing member with a screw member;
When the screw member is tightened, the distance between the one end face and the other end face is narrowed.

  In the claw member, the first claw fixing member has a protrusion that restricts movement of the claw body in a direction away from the rotation shaft, and the protrusion and the claw body have a flat inclined surface for contacting each other. It is preferable that both the inclined surface of the claw body and the inclined surface of the protruding portion are inclined by a predetermined angle so as to move away from the rotation axis as moving away from the sliding member.

  In the claw member, the claw body has a first clamping surface and a second clamping surface for clamping the fixing member, and the distance from the rotation axis can be changed between the first clamping surface and the second clamping surface. .

  ADVANTAGE OF THE INVENTION According to this invention, the chuck | zipper apparatus and claw member which can replace | exchange a nail | claw comparatively easily and in a short time can be provided, preventing the position shift of a workpiece.

It is a perspective view showing one embodiment of a chuck device concerning the present invention. FIG. 2 is a perspective view of a claw member and a sliding member of the chuck device shown in FIG. 1. It is a disassembled perspective view which shows one Embodiment of the nail | claw member which concerns on this invention, Comprising: (A)-(C) is a perspective view of a nail | claw main body, a 1st nail | claw fixing member, and a 2nd claw fixing member, respectively. It is a nail | claw member shown in FIG. 3, Comprising: (A) is the front view seen from the clamping surface side, (B) is the side view seen from the 2nd nail | claw fixing member side. It is a perspective view which shows other embodiment of a nail | claw main body. It is a perspective view of the conventional chuck device. It is the figure which looked at the nail | claw, the T nut, and the sliding member of the conventional chuck device from the outer peripheral surface side of the stage.

  Hereinafter, preferred embodiments of a chuck device and a claw member according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows an embodiment of a chuck device according to the present invention. The chuck device 1 includes a cylindrical stage 2 that can rotate around a rotation axis R, and a sliding member 3 that can be reciprocated while being guided by a groove provided along a direction toward the rotation axis R. Yes. The chuck device 1 is a scroll type chuck, and when a handle (not shown) provided on the stage 2 is turned, all the sliding members 3 are moved simultaneously in conjunction with each other. It may be an independent chuck that can be moved.

  The chuck device 1 further includes a claw member 4 provided on each of the sliding members 3. As will be described later, the claw member 4 is firmly fixed to the sliding member 3 by a plurality of screw members so as not to be displaced. When the sliding member 3 moves, the claw member 4 moves in the same manner.

  As shown in FIG. 1, the stage 2 is provided with three grooves at equal intervals for inserting the sliding member 3. Each groove is provided with one sliding member 3, and each sliding member 3 is provided with one claw member 4. That is, the chuck device 1 includes three sets of the sliding member 3 and the claw member 4 (see FIG. 2), and the workpiece is clamped by the three claw members 4. In FIG. 1, one set of sliding member 3 and claw member 4 is omitted.

  FIG. 3 is a perspective view of each member constituting the claw member 4. As shown in the figure, the claw member 4 is disposed between the claw body 5 for sandwiching the workpiece, the claw body 5 and the sliding member 3, and is fixed to the sliding member 3 and the claw body 5. It is comprised from the 1st nail | claw fixing member 6 and the 2nd nail | claw fixing member 7 which hold | maintain. That is, in this embodiment, the claw body 5 is fixed to the sliding member 3 via the first claw fixing member 6 and the second claw fixing member 7.

  In the following description, the “X direction” is the reciprocating direction of the sliding member 3 and means the radial direction of the stage 2 in this embodiment. The “Y direction” is a direction orthogonal to the X direction, and means the cylindrical tangential direction of the stage 2 in this embodiment. The “Z direction” is a direction orthogonal to the X direction and the Y direction, and means a normal direction perpendicular to the surface of the stage 2 in this embodiment.

  First, the nail body 5 will be described with reference to FIG. The claw body 5 is obtained by cutting a substantially rectangular parallelepiped metal block, has a clamping surface 8 for clamping a workpiece on the X direction front end side, and further has a protrusion 13 described later on the X direction rear end side. And a flat inclined pressing surface 9 for abutting with. The clamping surface 8 is a surface on the YZ plane. On the other hand, the inclined pressing surface 9 is inclined in the X direction by a predetermined angle from the YZ plane. More specifically, the inclined pressing surface 9 is inclined in a direction away from the rotation axis R as the distance from the stage 2 or the sliding member 3 increases (FIG. 4). (See (B)).

  The claw body 5 has a dovetail 10 extending in the X direction. As shown in FIG. 4A, the ant mold 10 is a “tenon” having a YZ sectional view trapezoidal shape, and has a bottom surface 10c on the XY plane, a first inclined side surface 10a, and a second inclined side surface 10b. is doing. In addition, the nail body 5 has a first horizontal pressing surface 11a that makes contact with the first inclined side surface 10a at an acute angle, and a second horizontal pressing surface 11b that makes contact with the second inclined side surface 10b at an acute angle. . The first and second horizontal pressing surfaces 11 a and 11 b are both surfaces on the XY plane, and are parallel to the bottom surface 10 c of the dovetail 10.

  Next, the 1st nail fixing member 6 and the 2nd nail fixing member 7 are demonstrated with reference to FIG. 3 (B) and (C). The first claw fixing member 6 and the second claw fixing member 7 constitute a dovetail corresponding to the dovetail 10 of the claw body 5, and the dovetail 10 of the claw body 5 is sandwiched by the dovetail. On the other hand, the first claw fixing member 6 is fixed to the sliding member 3. Therefore, in this embodiment, the claw body 5 and the sliding member 3 are fixed via the first claw fixing member 6 and the second claw fixing member 7.

  Specifically, the first claw fixing member 6 has a horizontal surface 12, a protruding portion 13 protruding from the horizontal surface 12 in the Z direction, and two through holes 14 provided in the horizontal surface 12. The horizontal plane 12 is a plane on the XY plane, and the through hole 14 is for inserting a screw member for fixing the first claw fixing member 6 and the sliding member 3. Moreover, the protrusion part 13 controls the movement to the X direction of the nail | claw main body 5, and has the flat inclination support surface 13a. The inclined support surface 13a is inclined in the X direction by the same angle as the inclined pressing surface 9 of the claw body 5 (see FIG. 4B).

  The first claw fixing member 6 has a first engagement portion 15 that constitutes one end surface of the dovetail groove and engages with the dovetail mold 10 of the claw body 5. The first engaging portion 15 has a first inclined pressing surface 15a corresponding to the first inclined side surface 10a of the dovetail 10 and a first horizontal support surface 15b corresponding to the first horizontal pressing surface 11a. The angle formed by the first inclined pressing surface 15a and the first horizontal support surface 15b is the same as the angle formed by the first inclined side surface 10a and the first horizontal pressing surface 11a. Further, the first horizontal support surface 15b and the horizontal surface 12 have a slightly larger separation distance in the Z direction than the first horizontal pressing surface 11a and the bottom surface 10c.

  The second claw fixing member 7 has a second engaging portion 16 that engages with the dovetail 10 of the claw body 5. When the second claw fixing member 7 is screwed to the side surface of the first claw fixing member 6, The part 16 constitutes the other end surface of the dovetail. The second engaging portion 16 is configured symmetrically with the first engaging portion 15. That is, the second engaging portion 16 has a second inclined pressing surface 16a corresponding to the second inclined side surface 10b of the dovetail 10 and a second horizontal support surface 16b corresponding to the second horizontal pressing surface 11b. Yes. The angle formed by the second inclined pressing surface 16a and the second horizontal supporting surface 16b is the same as the angle formed by the second inclined side surface 10b and the second horizontal pressing surface 11b. The second horizontal support surface 16b and the horizontal surface 12 have a slightly larger separation distance in the Z direction than the second horizontal pressing surface 11b and the bottom surface 10c.

  As shown in FIG. 3C and FIG. 4A, the second claw fixing member 7 has a support protrusion 17 whose tip shape is a semicircular shape when viewed in the YZ section. It is in contact with the first claw fixing member 6. For this reason, when the screw member 18 that fixes the first claw fixing member 6 and the second claw fixing member 7 is tightened, the second claw fixing member 7 rotates around the center of the semicircle as the rotation shaft 17a, and the dovetail groove The second engaging part 16 constituting the other end face (second inclined pressing face 16a) moves closer to the first engaging part 15 constituting the one end face (first inclined pressing face 15a) of the dovetail. That is, the width of the dovetail narrows, and the dovetail 10 of the claw body 5 is sandwiched.

  As shown in FIG. 4B, the inclined pressing surface 9 of the nail body 5 abuts on the inclined support surface 13 a of the protruding portion 13. As a result, the nail body 5 is positioned in the X direction.

  Then, with reference to FIG. 4, the movement of each part at the time of tightening the screw member 18 is demonstrated.

  As described above, when the screw member 18 is tightened, the second claw fixing member 7 is rotated around the rotation shaft 17 a, and the second inclined pressing surface 16 a of the second engaging portion 16 is the second inclined side surface 10 b of the dovetail 10. Is pressed toward the first engagement portion 15 side. Then, the first inclined side surface 10a of the dovetail 10 comes into contact with the first inclined pressing surface 15a of the first engaging portion 15, and a force that pushes down the entire claw body 5 in the vertical direction (Z direction) works. The pressing force is a force by which the first and second horizontal pressing surfaces 11a and 11b of the nail body 5 press the first and second horizontal supporting surfaces 15b and 16b, but the first and second horizontal pressing surfaces 11a. , 11b in the Z direction does not change even if pressed, and as a result, the claw body 5 is supported by the first and second horizontal support surfaces 15b and 16b and stops being lowered.

  The first horizontal support surface 15b (second horizontal support surface 16b) and the horizontal surface 12 are slightly larger in the Z direction than the first horizontal press surface 11a (second horizontal press surface 11b) and the bottom surface 10c. Therefore, as shown in FIG. 4 (A), the bottom surface 10c of the nail body 5 that has stopped down and the horizontal surface 12 are not in contact with each other and are slightly separated from each other.

  The force that pushes down the nail body 5 also becomes a force that the inclined pressing surface 9 of the nail body 5 presses the inclined support surface 13a of the protruding portion 13 in the vertical direction (Z direction) (see FIG. 4B). When such a force acts on the inclined support surface 13a of the projecting portion 13, a force in the X direction acts on the inclined pressing surface 9 of the claw body 5 due to the reaction. As a result, the claw body 5 slightly slides down on the inclined support surface 13a of the protrusion 13 and moves to an appropriate position in the X direction.

  Here, the inclination angles of the inclined pressing surface 9 and the inclined support surface 13a are preferably set to 2 ° to 45 °. When the inclination angle is set to an angle that deviates from this range, the “sliding-down” does not occur or hardly occurs, and positioning of the nail body 5 becomes difficult.

  As described above, according to the chuck device and the claw member of the present invention, the dovetail mold 10 is sandwiched between the first engagement portion 15 and the second engagement portion 16 that constitute the dovetail groove, and the claw body 5 has the Y direction. In addition, the positioning in the Z direction can be performed with high accuracy, and the positioning of the claw body 5 in the X direction can be performed with high accuracy in relation to the protruding portion 13, thereby preventing the displacement of the workpiece. it can.

  Further, according to the chuck device and the claw member of the present invention, the claw body 5 can be slid along the dovetail groove and removed simply by loosening the screw member 18 and slightly increasing the width of the dovetail groove. Moreover, when attaching the nail | claw main body 5, the dovetail shape 10 of the nail | claw main body 5 should just be slid and inserted in the dovetail groove | channel slightly expanded, and the screw member 18 should just be tightened back. That is, according to the chuck device and the claw member according to the present invention, the claw body 5 can be easily replaced in a short time.

  The preferred embodiments of the chuck device and the claw member according to the present invention have been described above, but the present invention is not limited to the above configuration.

  For example, the nail body may be shaped as shown in FIG. The claw body 5 'has two clamping surfaces 8a and 8b having different distances from the rotation axis R. Therefore, according to the nail body 5 ′, it is possible to deal with different types of workpieces having different sizes and shapes, and the labor for replacing the nail body 5 ′ can be further omitted.

DESCRIPTION OF SYMBOLS 1 Chuck apparatus 2 Stage 3 Sliding member 4 Claw member 5 Claw body 6 First claw fixing member 7 Second claw fixing member 8 Clamping surface 9 Inclined pressing surface 10 Dovetail 10a First inclined side surface 10b Second inclined side surface 10c Bottom surface 11a First horizontal pressing surface 11b Second horizontal pressing surface 12 Horizontal surface 13 Projection portion 14 Through hole 15 First engagement portion 15a First inclined pressing surface 15b First horizontal support surface 16 Second engaging portion 16a Second inclined pressing surface 16b Second horizontal support surface 17 Support protrusion 18 Screw member

Claims (6)

A stage rotatable about a rotation axis, a plurality of sliding members provided on the stage and reciprocally movable along a direction toward the rotation axis, and provided on each of the plurality of sliding members, A chuck device comprising a plurality of claw members that move together with the sliding member, and sandwiching a workpiece with the plurality of claw members,
The claw member is
A claw body having an ant shape extending in a direction toward the rotation axis;
A first claw fixing member that constitutes one end surface of the dovetail groove corresponding to the dovetail shape and is fixed to the sliding member;
A second claw fixing member that constitutes the other end surface of the dovetail symmetric with the one end surface and is fixed to the first claw fixing member with a screw member;
The chuck device, wherein the distance between the one end surface and the other end surface is narrowed when the screw member is tightened. The first claw fixing member has a protrusion that restricts the claw body from moving in a direction away from the rotation shaft,
The protrusion and the nail body have flat inclined surfaces for contacting each other,
The inclined surface of the claw body and the inclined surface of the protruding portion are both inclined by a predetermined angle so as to move away from the rotating shaft as moving away from the sliding member. The chuck apparatus as described. The claw body has a first clamping surface and a second clamping surface for clamping the fixing member,
The chuck device according to claim 1, wherein the first clamping surface and the second clamping surface have different distances from the rotation shaft. A chuck apparatus comprising: a stage rotatable about a rotation axis; and a plurality of sliding members provided on the stage and reciprocally movable along a direction toward the rotation axis. It is a claw member that is provided in each and moves together with the sliding member, and holds the workpiece,
A claw body having an ant shape extending in a direction toward the rotation axis;
A first claw fixing member that constitutes one end surface of the dovetail groove corresponding to the dovetail shape and is fixed to the sliding member;
A second claw fixing member that constitutes the other end surface of the dovetail symmetric with the one end surface and is fixed to the first claw fixing member with a screw member;
When the screw member is tightened, the distance between the one end surface and the other end surface is narrowed. The first claw fixing member has a protrusion that restricts the claw body from moving in a direction away from the rotation shaft,
The protrusion and the nail body have flat inclined surfaces for contacting each other,
The inclined surface of the claw body and the inclined surface of the protrusion are both inclined by a predetermined angle so as to move away from the rotation shaft as moving away from the sliding member. The nail member as described. The claw body has a first clamping surface and a second clamping surface for clamping the fixing member,
The claw member according to claim 4 or 5, wherein the first clamping surface and the second clamping surface are different in distance from the rotation axis.

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