JPH1076374A - Work fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a work fixing device capable of surely holding and fixing a work in accordance with plural work contours. SOLUTION: The unit 5A of a work holding device is provided with a pair of lug members 31 which are formed with plural holding parts 30a , 30b , 30c in accordance with the contours W1a , W1b , W1c of plural works, with both ends of the rotary shaft 32 supported rotatably by housings 40, 41. The lug members 31 are each formed with engaging recessed parts 75a , 75b , 75c on the outer circumferential face diagonally from each holding part, and are rotatably driven by a motor 70. The engaging recessed parts are engaged with or released from a wedge member 76 which approaches and recedes against and in the radial direction of the work by driving of a cylinder 77. The holding parts 30a , 30b , 30c of the lug members 31 are positioned so as to be adjusted to the contours W1a , W1b , W1c of the works.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work fixing device, and more particularly, to a work fixing device for fixing a work having a different outer shape by gripping the work.

[0002]

2. Description of the Related Art For example, in friction welding, frictional heat is generated at a joint interface by bringing end faces of workpieces to be joined into contact with each other and performing relative motion while applying pressure, and both works are applied by applying an upset thrust. Join. As the relative motion, generally, a case where the first work is rotated to fix the second work, and a case where the third work is sandwiched between the first and second works, and the first and second works, Alternatively, there is a case where one of the third works is fixed and the other is rotated, or the work is vibrated instead of the rotation.

In general, a friction welding apparatus grips at least one workpiece by gripping the workpiece in a non-rotatable manner, and grips another workpiece so as to face the same axis as the axis of the fixed workpiece. And a work rotating device for rotating the workpiece as a relative motion, and a work surface fixed to the work fixing device and a work surface gripped and rotated by the work rotating device are pressed so as to press each other relatively to each other, and the upset thrust is reduced. And a thrust device for giving. Then, in order to restrict the retreat of the work when pressing the joint surfaces of the work against each other, the work fixing device and the work rotating device are each provided with a stopper member with which the end surface opposite to the joint surface of the work abuts. ing.

In such a friction welding apparatus, in order to join the workpieces with high accuracy, the joining surfaces of the respective workpieces abutting on the stopper members are projected from the workpiece fixing device and the workpiece rotating device by a predetermined length. In addition, it is necessary to hold and fix the work at an accurate position and securely.

As a conventional work fixing device, there is Japanese Utility Model Publication No.
As disclosed in JP-A-5-5634, a pair of gripping tools removably attached to a pair of clamp tables are provided with symmetrical cross-shaped gripping grooves on inner surfaces thereof, and each cross section of the gripping grooves is provided. There is known a gripping tool for a pipe member in a clamping device of a friction welding machine, which has a substantially semicircular concave shape.

In this grasping tool for a pipe member, the diameter of the vertical grasping groove and the lateral grasping groove formed in a cross shape in the grasping tool are made different diameters, and the opposed inner surface of the grasping tool is shifted by 90 °, Two straight pipes can be grasped with a single tool.

Further, as another conventional work fixing device, as disclosed in Japanese Patent Publication No. Hei 4-2351, a pair of sliders are arranged on a bed so as to face each other with a pressure contact axis interposed therebetween. The claw holder is installed on the slider so as to be rotatable about an axis parallel to the pressing axis, and the claw holder is provided with a plurality of clamp claws having different clamping surfaces in a circumferential direction, and is engaged with the claw holder. Further, there is known a clamp device of a friction welding machine provided with a fixing mechanism for fixing or releasing a claw holder to or from a slider by detaching.

[0008] In this clamp device of the friction welding machine, a clamp base is installed on a bed, and a pair of sliders are disposed on the clamp base so as to face each other across a pressure welding axis, and each slider is attached to the clamp base. It is slidably attached to a horizontally fixed guide bar. In the detailed description of the clamp device of the friction welding machine, two clamp devices are installed so as to grip the vicinity of both ends of the work.

The fixing mechanism for fixing or releasing the claw holder with respect to the slider includes an engagement hole formed in the claw holder side at equal intervals in a circumferential direction on a contact sliding surface between the claw holder and the slider. And a positioning pin protruding from the slider so as to be disengageable from the engagement hole. A lock cylinder is formed on the slider, and a pawl holder is attached to the piston rod of the lock cylinder. . Then, when replacing the position of the clamp claw, the piston rod of the lock cylinder is extended in the axial direction to move the claw holder away from the slider. Then, since the positioning pin comes out of the engagement hole, the claw holder is rotated around the axis of the piston rod to change the position of the clamp claw.

[0010]

In the prior art disclosed in Japanese Utility Model Publication No. 45-5634, a gripping tool is formed so that gripping grooves having different diameters are perpendicular to the gripping tool. For this reason, there is a problem that only two different shapes can be handled with respect to the workpiece to be gripped. And when it is necessary to grip a workpiece other than the two types of shapes formed on this gripping tool, the gripping tool must be replaced, and the work must be performed by hand to replace the gripping tool. There is a problem in that the replacement work is complicated. In addition, when the work has a certain length, the work can be gripped only partially, and the work cannot be rotated by securely gripping the work on the same axis as each other. There was a problem that can not be fixed to.

Further, among the above-mentioned conventional techniques,
In the structure disclosed in Japanese Patent Publication No. 2351, since the fixing mechanism is configured to move the claw holder in the axial direction of the piston rod of the lock cylinder, the rotation shaft of the claw holder is configured to support both ends. Therefore, it is attached to the piston rod in a so-called cantilever state. With the claw holder mounted in a cantilevered state, there is a limit in gripping a work with a required gripping force and securely fixing the work in a non-rotatable manner.

Further, in particular, in the device disclosed in Japanese Patent Publication No. 4-2351, a clamp base on which two sliders are disposed is mounted on a bed in order to grip the vicinity of both ends of a work. However, since the distance between the two clamp bases cannot be arbitrarily adjusted, the amount of protrusion from the claw holder may not be appropriate depending on the length of the work. Therefore, there is a problem that the workpiece cannot be gripped corresponding to a plurality of workpiece outer shapes. In addition to this, when replacing the position of the clamp claw, each claw holder installed on the slider is released by detaching the engagement hole from the positioning pin, respectively.
There is a problem that it takes time and effort to perform a rotating operation.

The present invention has been made in view of the above problems, and a first object of the present invention is to provide a work fixing device capable of securely gripping and fixing a work corresponding to a plurality of work outlines. It is in.

It is a second object of the present invention to provide a work fixing device capable of holding and fixing a work in a state where the work is appropriately projected so as to correspond to a work having a plurality of lengths.

[0015]

According to a first aspect of the present invention, a plurality of claw members having a plurality of grip portions formed in accordance with a plurality of workpiece outer shapes are provided. And a unit that rotatably provides a gripper corresponding to a workpiece to be positioned at a workpiece gripping position and supports both ends of a rotation shaft of each claw member so as to approach and separate from the workpiece, respectively. .

In order to achieve the second object,
According to a second aspect of the present invention, in the first aspect, a plurality of units are provided so as to be relatively movable in the axial direction of the workpiece, and at least one unit has a driving unit for rotating the claw member. The other unit can be connected to the driving means so as to rotate the claw member following the driving means.

According to the first aspect of the present invention, the claw member of the unit is rotated so that the grip portion corresponding to the work to be gripped faces the work, and then the claw member is non-rotatably engaged and positioned. . Then, each claw member is moved close to the workpiece, and the workpiece is gripped and fixed by the gripper. Since each claw member is supported at both ends of its rotating shaft, it is possible to reliably grip the work.

In the invention according to claim 2, the unit having the driving means for rotating the claw member and the other unit are moved relatively close to each other, and the claw member of the other unit is rotated by the rotating means. The workpiece is rotated in accordance with the claw member to be gripped, and the gripping portion corresponding to the workpiece to be gripped is positioned so as to face the workpiece.

[0019]

DETAILED DESCRIPTION OF THE INVENTION One embodiment of the work fixing device according to the present invention, by when applied to friction welding apparatus for joining a workpiece W ₁ and the workpiece W _2, based on FIGS. 1 to 6 This will be described in detail. In the drawings, the same reference numerals denote the same or corresponding parts.

First, a friction welding apparatus to which the work fixing device 1 according to the present invention is applied will be described with reference to FIG. The friction welding device in this embodiment is a work W
A workpiece fixing device 1 for fixing by gripping the ₁ non-rotatably, a spindle unit 2 as a work rotating device for rotating by gripping so as to face the workpiece W ₂ on the same axis as the axis of the workpiece W _1, A thrust device 3 for applying an upset thrust while applying pressure so as to press the joining surfaces of the work W ₁ fixed to the work fixing device 1 and the work W _{2 held} and rotated by the spindle unit 2 relatively to each other. And In the following description, the front end surface an end surface serving as a bonding surface of the workpiece W ₁ and the workpiece W _2, and the rear end surface of the end face on the side opposite to the joint surface, and to say, respectively.

As shown in FIG. 1, the spindle unit 2, the main shaft 1 having a chuck 10 for gripping a workpiece W ₂
1, and a rotation servomotor 14 for rotating the main shaft 11 through the gears 12 and 13 or the like, the axial direction of the workpiece W ₂ to the linear guide 15 provided on the base 4 via the slide member 16 (Left and right directions in FIG. 1). A brake disk 17 is provided on the main shaft 11, and the main shaft 11 can be braked by operating a brake caliper 18. To the side where the chuck 10 is provided in the main shaft 11 on the opposite end, a stopper member 19 for restricting the contact with its retracted to the rear end surface of the work W ₂ is provided.

As shown in FIG. 1, in this embodiment, the thrust device 3 is provided with an arm 2 provided on the spindle unit 2.
0 and the press-contact feed shaft 2 inserted through the arm 20
1 and a press-servo motor 22 for rotating the press-feeding feed shaft 21 around an axis. The main unit 2 is relatively moved with respect to the work fixing device 1. An internal thread (not shown) is formed on the arm 20.
A screw groove is formed in the press-contact feed shaft 21, and a female thread portion of the arm 20 is screwed into the screw groove of the press-contact feed shaft 21. The pressing shaft 21 is rotatably supported by a bearing 23. Servo motor 22 for pressure welding
Is driven to rotate the pressure contact shaft 21 around the axis, so that the front end face of the work W ₂ gripped and rotated by the spindle unit 2 is moved with respect to the front end face of the work W ₁ fixed to the work fixing device 1. The main shaft unit 2 in which the arm 20 is screwed to the press-contact shaft 21 is moved so as to be pressed. Moreover, the thrust device 3, as the workpiece W ₂ with respect to the workpiece W ₁ is pressed against a predetermined force, (not shown) position detecting means for detecting a movement of the spindle unit 2
Is provided. In this embodiment, the case where the spindle unit 2 is relatively moved with respect to the workpiece fixing device 1 has been described. However, the present invention is not limited thereto. It can also be configured to be moved in an arbitrary manner.

Next, a work fixing device 1 according to the present invention, which is applied to the friction welding device configured as described above, will be described in detail mainly with reference to FIGS. Incidentally, in this embodiment, the outer shape of the workpiece W ₁ to grip the work fixing device 1, as shown in FIGS. 4 and 5, of circular cross section, different W _1a diameters, W _1b, 3 kinds of W _1c However, the present invention is not limited to this, and the gripping portion may be formed so as to be able to fit two or four or more types of workpieces. The grip portion may be formed so as to be able to grip. Furthermore, the work fixing device 1 according to the present invention
The present invention can be applied to a device other than the friction welding device that requires fixing of a work.

The work fixing device 1 according to the present invention, a plurality of workpiece contour W _1a, W _1b, in accordance with the W _1c plurality of gripping portions 30 _a, 30 _b, 30 a plurality _{of c} is formed of the claw member 31
Are gripping portions 30 _a , 30 _b , corresponding to the workpiece to be gripped.
30 One of the _c but provided rotatably so as to be positioned on the workpiece gripping position, respectively toward and away from rotatably supported by the unit 5A both ends of the rotation shaft 32 of each pawl member 31 with respect to the workpiece W _1, 5B.

Further, the work fixing device 1 according to the present invention comprises:
Units 5A, 5B and provided relatively movable in the axial direction of the workpiece W _1, at least one unit 5A is claw member 3
The other unit 5B is driven by the driving means 33 to rotate the claw member 3.
1 can be connected to the driving means 33 so as to rotate.

As shown in FIG. 3, in this embodiment, the clamp base 35 (see FIG. 1) is provided on the base 4, to the clamp base 35 on the extending in the axial direction of the work W ₁ A rail 36 is provided so as to operate. The clamp base 35, a fixed base 37 of the unit 5A for fixing by gripping the front end of the workpiece W ₁ is provided, the movable base 38 of the unit 5B for fixing by gripping the rear end of the workpiece W ₁ is It is slidably mounted on the rail 36 via a slide member 39. This allows
Unit 5B is in a state of being opposed to the unit 5A, which enables axial movement of the workpiece W _1. The clamp base 35, in contact with the rear end face of the workpiece W _1, the workpiece when the pressed workpiece W ₁ and W ₂ together W
₁ is provided with a stopper member (not shown) for restricting retreat.

As shown in FIGS. 4 and 5, each unit 5A, 5B includes a plurality of workpieces W _1a , W _1b , W
_A plurality of grips 30 _a , 30 _b , 30 according to the outer shape of _1c
c is formed, and a plurality of claw members 31 rotatably supported so that the gripping portions 30 _a , 30 _b , 30 _c corresponding to the workpieces W _1a , W _1b , W _1c to be gripped face the workpiece, A housing 4 for supporting both ends of the rotating shaft 32 of the claw member 31;
And 0,41, so as to grip and release the gripper 30 _a, 30 _b, 30 _c of the pawl member 31 supported by the housing 40, 41 the work W _1a, W _1b, with respect to W _1c,
Pawl member moving means for toward and away from the movement (the code according to the in the figure is omitted), to position the predetermined gripper, i.e. one of the gripping portions 30 _a, 30 _b, 30 _c in the workpiece holding position Positioning means (not shown in the figure).

The pawl member 31 is, in this embodiment, those of pair is provided so as to sandwich the workpiece W ₁ from both sides. Each claw member 31 is formed in a substantially cylindrical shape, and a rotation shaft 32 is provided at the center of the cross section in the radial direction. Then, on the outer peripheral surface of the pawl member 31, three different contours W _1a of the workpiece W ₁ in diameter, W _1b, in accordance with the W _1c three gripper 30 _a, 30 _b, 30 _c is, pawl member 31 are formed so as to extend in the axial direction at appropriate intervals in the circumferential direction.

[0029] The housing 40, 41 as shown in FIG. 2, is provided slidably in the radial direction of the workpiece W ₁ on the fixed and movable base 37. Housing 40,
Reference numerals 41 rotatably support both ends of the rotation shaft 32 of the claw member 31, respectively.

As shown in FIGS. 4 and 5, the claw member moving means includes a cylinder 50 for moving _one housing 40 supporting both ends of the rotation shaft of the claw member toward and away from the workpiece W1, and a link mechanism for toward and away from moving the other of the housing 41 against the workpiece W ₁ in conjunction with the movement of the one of the housing 40. The rod 51 is slidably inserted through the fixed base 37 and the movable base 38 so as to penetrate. An elongated hole 52 is formed at a portion of the fixed and movable bases 37 and 38 where the one housing 40 is provided, and a block 53 for connecting the one housing 40 and the rod 51 is arranged in the elongated hole 52. I have. Fixed and movable base 37,
On one side of the bracket 38, a bracket 54 is provided.
, So that it is pivotable. The other housing 4
A bracket 57 is provided on the outside of 1. Elongated holes 58 and 59 are formed at both ends of the arm 55, and the end of the rod 51 and the elongated hole 58 on one end of the arm 55, and the elongated hole 59 and the bracket 57 on the other end of the arm 55 are respectively formed. It is pivotally connected by pins 60 and 61 so as to be rotatable.

As shown in FIG. 4, the unit 5A, one of the gripping portions 30 _a, 30 _b, 30 _c as a positioning means for positioning the workpiece holding position, the motor that rotates drive the pawl member 31 70 and the grippers 30 _a , 30 _b , 30
and a locking mechanism 71. the rotationally fixed engagement in a position to face the predetermined gripping portion to the workpiece W ₁ of the _c. As the motor 70, a stepping motor or the like that can be rotated to a desired angle is used. As shown in FIGS. 2 and 4, the rotation shaft 32 of the claw member 31 and the motor 7
The zero drive shaft is provided with pulleys 72 and 73, respectively, and a belt 74 is wound around both pulleys 72 and 73. The locking mechanism 71 is provided for each of the grip portions 3 of the claw member 31.
And 0 _a, 30 _b, 30 _c and the engaging recesses are formed, respectively, respectively on the outer peripheral surface of the diagonal _{75 a, 75 b, 75 c} , with respect to the respective engaging recesses 75 _a, 75 _b, 75 _c And a wedge member 76 which is moved forward and backward in the radial direction of the claw member 31. FIG. 4 shows a case where the engaging concave portion 75 _a is located at a position facing the wedge member 76 so as to be engaged with the wedge member 76. The wedge member 76 is inserted into the housings 40 and 41, and the housings 40 and 41 are provided with a cylinder 77 as an actuator for moving the wedge member 76 forward and backward. By moving the wedge member 76 forward and backward with respect to the claw member 31 in the radial direction, both ends of the rotation shaft 32 of the claw member 31 can be supported.

As shown in FIG. 5, the unit 5B is provided with the same locking mechanism as the unit 5A. When the rotating shaft 32 of the claw member 31 of the unit 5A and the rotating shaft 32 of the claw member 31 of the unit 5B face each other, the unit 5B is moved closer to the unit 5A. Engaging mechanisms are provided to engage with each other so that the claw members 31 of the unit 5B follow the rotation of the claw members 31 driven by the motor 70 of 5A. As shown in FIG. 2, the engagement mechanism includes a projecting portion 80 having a rectangular cross section provided on the end face of the rotating shaft 32 of one unit 5A and a projecting portion 80 having a rectangular cross section provided on the end face of the rotating shaft 32 of the other unit 5B. And a fitting concave portion 81 provided so as to fit the portion 80 relatively unrotatably. The engagement mechanism is not limited to this.
Any method can be adopted as long as the two claw members can be relatively non-rotatably and detachably connected.

The mechanism for moving the placed unit 5B in the axial direction of the workpiece W ₁ to the rail 36, the rail 3
6 includes a pair of screw shafts 90 rotatably provided around an axis along the axis 6, and a motor 91 as an actuator for driving the shaft screws 90 to rotate. As shown in FIG. 3, both ends of the screw shaft 90 are pivotally attached to a support 92, and pulleys 93 are provided at one ends. A pulley 94 is also provided on the drive shaft of the motor 91, and a belt 98 is wound around the pulleys 93, 94 via idle pulleys 95, 96, 97, as shown in FIG. As a result, the two screw shafts 90 rotate synchronously.
As the motor 91, a stepping motor or the like that can be rotated to a desired angle can be used. The screw shaft 90 is formed with a trapezoidal screw whose screw thread has a trapezoidal cross section, and is screwed to the movable base 38 of the unit 5B. By driving the motor 91, the double screw shaft 90
There Once a predetermined angle rotation synchronously, unit 5B screwed to the movable base 38 is moved in the axial direction so that it can correspond to the length of the workpiece W _1. The screw shaft 90 also has a function of receiving a thrust at the time of friction welding.

[0034] The work fixing device 1 according to the present invention comprises:
In this embodiment, the unit 5A is a work W ₁
Is fixedly disposed so as to grip the front end of, but unit 5B is described by way of example are movable arranged to grip the trailing end of the workpiece W _1, it is not limited thereto. In addition to this embodiment, the unit 5B fixedly arranged to grip the front end of the workpiece W _1, it may be movable placing unit 5A so as to grip the rear end of the workpiece W _1. Also, depending on the necessity of the work to be fixed, the unit 5A,
The unit may be fixed or movable in addition to 5B.

Next, the work fixing device 1 according to the present invention
Stage replacement for adjusting the gripping portion 30 to the outer shape of the workpiece W _1, and the operation for stages replacement for corresponding to the length of the workpiece W _1, mainly be described with reference to FIG.
First, work information such as the diameters and lengths of the works W ₁ and W ₂ , the offset, and the like are input to a control device (not shown) (S1). The control device drives the motor 91 to rotate the screw shaft 90 synchronously based on the work information, and brings the unit 5B close to the unit 5A (S2). As a result, the fitting concave portion 81 of the unit B fits into the projecting portion 80 of the unit 5A, and the rotating shafts 32 of the claw members 31 of the unit 5A and the unit B are connected to each other. Then, in a state that releases the engagement with the engaging recess 75 of the pawl member 31 of the wedge member 76 by driving the cylinder 77 so that retraction (S3), the outer shape of the work W ₁ by driving the motor 70 of the unit 5A Gripper 30 suitable for
_a, 30 _b, one of the 30 _c rotating the pawl member 31 so as to face the workpiece W ₁ (S4). At this time, since the rotation shaft 32 of the claw member 31 of the unit 5A and the rotation shaft 32 of the claw member 31 of the unit 5B are connected, the claw member 31 of the unit 5B is interlocked with the claw member 31 of the unit 5A. And gripping portions _30a , 3
0 _b, 30 one of _c is positioned to face the workpiece W _1.

[0036] When the position is to fit one of the outer shape of the workpiece W ₁ of the two units 5A, the grip portion 30 _a of the pawl member 31 of 5B, 30 _b, 30 _c, and driven to extend the cylinder 77 , is advanced to the radial direction of the work W ₁ by engaging the wedge member 76 against the engagement recess 75 of the pawl member 31 (S5), the grip of the claw member 31 to position the pawl member 31 so as not to rotate The step change of the unit 30 ends. Then, the motor 91 is driven to drive the two screw shafts 9 provided on the left and right.
1 is synchronously rotated to separate the unit 5B from the unit 5A to a predetermined position (S6).
Ends of the workpiece W ₁ a stage replacement for corresponding to the length (S7).

Next, the workpiece W ₁ is moved to the gripper 3 of the claw member 31.
The operation for gripping and fixing by using a zero will be described. Since this operation is the same for the unit 5A and the unit 5B, the operation of the unit 5A will be described with reference to FIG. In order to close move pawl member 31 to the work W _1, when the cylinder 50 extension drives, block 53 provided on one of the housing 40 to move the elongated hole 52, the sliding rod 51 to the left in FIG. 4 I do. Then, the arm 55 connected to the rod 51 rotates clockwise in FIG. 4 around the pin 56, and presses the other housing 41 provided with the bracket 57. Accordingly, with the approach movement to the workpiece W ₁ of one of the claw member 31, the other pawl member 31 is to approach movement relative to the workpiece W _1. Then, similarly it may release the grip on the workpiece W ₁ of the pawl member 31, by retraction driving the cylinder 50, one of the housing 4
0 in conjunction with the separating from the workpiece W ₁ of the pawl member 31 which is supported by the claw member 31 supported on the other housing 41
Also away from the workpiece W _1.

It should be noted, in this embodiment, configured in conjunction with toward and away from moving relative to the workpiece W ₁ of one of the claw member 31 is toward and away from the movement of the other pawl member 31 with respect to the workpiece W ₁ However, without being limited to this, cylinders are respectively provided on the housings 40 and 41 that support both ends of the rotating shaft 32 of the claw member 31, and the pair of claw members 31 are separately brought close to and away from the workpiece W ₁ . It can also be configured to move away.

[0039]

According to the first aspect of the present invention, a plurality of claw members having a plurality of gripping portions formed in accordance with a plurality of workpiece outer shapes are positioned at a workpiece gripping position corresponding to a workpiece to be gripped. The unit is configured so as to be rotatable so that both ends of the rotating shaft of each claw member are supported so as to be able to approach and separate from the work, respectively. Can be securely held and fixed.

According to the second aspect of the present invention, a plurality of units are provided so as to be relatively movable in the axial direction of the work, and at least one unit has a driving means for rotating the claw member. The other units can be connected to the driving means so as to rotate the claw member following the driving means, so that the unit is properly protruded corresponding to a plurality of lengths of the work. Can be fixed.

[Brief description of the drawings]

FIG. 1 is a front view showing a friction welding device to which a work fixing device according to the present invention is applied.

FIG. 2 is a front view of the work fixing device according to the present invention.

FIG. 3 is a cross-sectional plan view of the work fixing device according to the present invention.

FIG. 4 is an explanatory view of the unit A of the work fixing device according to the present invention as viewed in the direction of line AA in FIG. 3;

FIG. 5 is an explanatory view of a unit B of the work fixing device according to the present invention as viewed in the direction of line BB in FIG. 3;

FIG. 6 is a flowchart showing a control of a step change corresponding to a length of a work of the work fixing device according to the present invention.

[Description of sign]

1 work fixing device 5A, 5B unit 30 _a, 30 _b, 30 _c gripper 31 claw member 32 pivot shaft 33 rotating means 40, 41 the housing 70 motor 71 locking mechanism 75 _a, 75 _b, 75 _c engaging recess 76 Wedge member 77 Cylinder 80 Projecting part 81 Fitting concave part

Claims (2)

[Claims] 1. A plurality of claw members having a plurality of gripping portions formed in accordance with a plurality of workpiece outer shapes are rotatably provided such that a gripping portion corresponding to a workpiece to be gripped is located at a workpiece gripping position. A work fixing device, comprising: a unit that supports both ends of a rotation shaft of a claw member so as to be able to approach and separate from the work, respectively. 2. A plurality of units are provided so as to be relatively movable in the axial direction of a workpiece, at least one unit has a driving unit for rotating a claw member, and the other unit includes the driving unit. The work fixing device according to claim 1, wherein the work fixing device is connectable to the driving means so as to rotate the claw member following the rotation of the work member.