JPH0731925Y2 - Collet chuck - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a collet chuck used for clamping a work piece such as a round bar or a pipe.

[Prior Art] Conventionally, as a device for clamping the round bar, the pipe, etc., a three-jaw chuck 200 as shown in FIG. 18, a three-way collet chuck 201 as shown in FIGS. 19 and 20, etc. There is. These devices are used for workpieces such as round bars and pipes.
The workpiece 202 is held by sandwiching or grasping the end portion of the workpiece with a three-claw 203, a slit collet 204, or the like.

[Problems to be Solved by the Invention] However, the above-mentioned conventional technique has the following problems. That is, the three-jaw chuck 200 and the three-way collet chuck 201 hold or grip the end portion of the workpiece 202 such as a pipe from three directions or the entire outer circumference. Therefore, when processing the end of the workpiece 202 such as a pipe, and also in the direction different from the end by 180 degrees, the three-jaw chuck 200 performs processing on the end of the workpiece 202. However, since the end of the work piece 202 is clamped by the three claws 203 at different positions by 120 degrees, the end of the work piece 202 can be processed by 180 degrees at different positions. There is a problem in that it is necessary to re-pinch the work piece 202 after performing the processing, which complicates the work process and is very troublesome. On the other hand, in the case of the three-way collet chuck 201, the end of the workpiece 202 such as a pipe is
Since it is gripped from the entire outer periphery, there is a problem that the end portion of the workpiece 202 cannot be processed in the first place.

[Means for Solving the Problem] Therefore, the present invention was made in order to solve the problems of the above-mentioned prior art, and its purpose is to provide an end portion of a workpiece such as a round bar or a pipe. It is an object of the present invention to provide a collet chuck capable of being processed so that it can be processed from a position different by 180 degrees in a state that the end is processed so that it can be processed.

That is, according to the invention, a claw member that clamps an end of a chucked member only from a direction different by 180 degrees and exposes an end of the chucked member in a direction orthogonal to the sandwiching direction, and the claw member can be retracted and retracted. And a holder member that holds the claw member so as to prevent the claw member from rotating and coming off, and exposes an end of the member to be chucked in a direction orthogonal to the holding direction of the claw member. A pair of claw portions provided with an abutting portion for immersing the claw member in the holder member by abutting the tip end surface of the chucked member, while sandwiching the end portion of the claw member only from 180 degrees different directions, A pair of leaf springs connected so as to bias the pair of claws in a direction in which they are separated from each other, and a connecting portion that connects the base end portions of the pair of leaf springs, and the holder member, The claw member is immersed And a guide surface for moving the claw portions so that the pair of claw portions sandwich the chucked member, and the claw member is provided with the pair of claw portions projecting outward from the holder member and opened with respect to each other. When the chucking operation of the chuck member is started and the tip end surfaces of the chucked members are brought into contact with the abutting portions of the pair of claw portions, the claw portions are retracted into the holder member, and the pair of claw portions inside the holder member. When the pair of claws are moved into the holder member, the pair of claws are moved so as to hold the chucked member by the guide surface of the holder member. Is configured to complete.

[Operation] In the present invention, the tip end surface of the chucked member is brought into contact with the abutting surface of the claw portion to immerse the claw member in the holder member, and at that time, the pair of claw portions guide the holder member. The chucked member is moved so as to be clamped by the surface, and the end portion of the chucked member is clamped by the pair of claw portions. Since these claw portions sandwich the chucked member from directions different by 180 degrees, the end portions of the chucked member can be processed from positions different by 180 degrees.

Further, according to the present invention, the claw member is held in the holder member so as to be retractable, and the claw member starts the chucking operation of the chucked member with the pair of claw portions projecting outward from the holder member and opened to each other. Since the above-mentioned claw member moves from a state in which the pair of claw portions project outward from the holder member to a state in which the claw member is retracted in the holder member, the amount of movement of the claw member should be large. Even if the chucked member is sandwiched only from directions different by 180 degrees, the chucked member can be reliably chucked while the end portion of the chucked member is exposed to the outside and can be processed.

Moreover, in this invention, since the chucking operation of the chucked member is started in the state where the pair of claw portions of the claw member protrudes outward from the holder member and are opened to each other, the chucking operation of the chucked member is started in a pair. The claws are opened in a taper shape, and the ends of the chucked member are guided by the claws that open in a taper shape to ensure that the ends of the chucked member are abutted against the abutting parts of the claws. The chucking operation of the chucked member can be reliably performed even if the chucked member is sandwiched only from the directions different by 180 degrees.

Further, in this invention, since the tapered claw portion has a function of guiding the end portion of the chucked member, it is necessary to form a tapered surface for guiding the end portion of the chucked member on the tip end surface of the claw portion. The entire length of the claw portion can be contributed to the clamping of the chucked member, and the chucked member can be chucked with a sufficient clamping force even if the chucked member is clamped only from 180 ° different directions. Is possible,
It is possible to reliably prevent the chucked member from falling off during processing.

[Embodiment] The present invention will be described below based on an illustrated embodiment.

FIG. 2 shows a laser processing apparatus to which the collet chuck according to the present invention can be applied. In the figure, reference numeral 1 indicates a base frame having a substantially front gate shape installed in a work place for processing. In this base frame 1,
Two laser processing heads 2 and 3 are mounted, and laser light can be guided to these processing heads 2 and 3 from a laser light source such as a carbon dioxide gas laser (not shown). Further, one processing head 2 is attached to the base frame 1 in a fixed state, and the other processing head 3 is attached to the base frame 1 so as to be slidable in one direction along the horizontal direction. . Then, the processing head 3 is moved in the horizontal direction (X direction) by the feed screw 4.
The position can be adjusted. In the figure, reference numeral 5 indicates an operation portion for operating the feed screw 4.

An object to be processed by a laser beam is arranged below the two processing heads 2 and 3. That is, the workpiece 6 is placed on the base 6 installed on the floor,
An XY table 7 for moving in the Y direction is placed, and a base 8 holding a workpiece is mounted on the XY table 7.

As shown in FIG. 3, the base 8 can hold ten pipes 9, 9 ... As workpieces at the same time.
On the base 8, collet chucks 10 and 10 for holding the ends of the pipes 9 and 9 and tail centers 11 and 11, respectively.
Are arranged so as to face each other, and two sets of such collet chucks 10, 10 ... And tail centers 11, 11 ... Are arranged along the longitudinal direction of the base plate 8. .

The collet chucks 10, 10 ... and the tail centers 11, 11
... are the bases 8 as shown in FIGS. 3 and 4, respectively.
5 on the mounting boards 12 and 12 installed upright with a predetermined interval
They are installed individually. Also, the above collet chuck 1
0, 10 ... are rotatably mounted on the mounting board 12,
Pipes 9 and 9 held by the collet chucks 10 and 10.
180 degrees, and at the end of these pipes 9, 9 ...
It is possible to process from different directions by 80 degrees.
On the other hand, a mounting board on which the tail centers 11, 11 ... Are mounted.
As shown in FIG. 5, 12 is movable by an air cylinder 13 ', and the movement of the tail centers 11, 11 ... Allows the collet chucks 10, 10 ... of the pipes 9, 9 ... Is held and released.

1 and 6 show an embodiment of a collet chuck according to the present invention. This collet chuck is
For example, it is used as the collet chucks 10, 10 ...

The collet chuck 10 includes a claw member 70 and a holder member 71, as shown in FIGS. 1 and 6. Claw member
70 is the end of the pipe 9 as the member to be chucked,
It has a pair of claws 72, 72 which are sandwiched at positions facing each other. The claws 72, 72 are formed in a flat plate shape, and the inner side surface 73 thereof is formed in an arc shape in consideration of a radius of curvature in consideration of a fitting margin with respect to an outer diameter of the pipe 9 to be clamped. The outer side surface 74 is formed in an arc shape having a larger radius of curvature than the inner side surface 73. Further, the diameter of the outer surface 74 on the base end side is tapered to be smaller. further,
An abutting portion 75 for abutting the tip of the pipe 9 is provided on the base end portion of the inner side surface 73 of the claw portion 72.
75 is projected inward so as to be orthogonal to the inner side surface 73. And, between the abutting portion 75 and the inner side surface 73,
An escape portion 76, which is cut out laterally, is interposed.

Leaf springs 77, 77 are connected to the base ends of the claws 72, 72, and the base ends of the leaf springs 77, 77 are fixed to a rectangular parallelepiped connecting part 78. The claws 72, 72 are leaf springs 77, 77.
Are urged in directions away from each other. Also,
In order to prevent rotation of the claw member 70, the leaf spring portions 77, 77 are
Grooves 79, 79 for inserting a pin to be described later are formed long.

The claw member 70 is mounted on the holder member 71 so as to be retractable. The holder member 71 is composed of a base end portion 80 formed in a cylindrical shape and a flat plate-like tip end portion 81, and a flange portion 82 is provided between the base end portion 80 and the tip end portion 81. ing. A concave portion 83 for accommodating the leaf spring portion 77 and the connecting portion 78 of the claw member 70 is formed in the distal end portion 81 and the proximal end portion 80. It has a freely movable shape. Further, on the inner surface of the rotating end of the tip portion 81,
The claw member 70 moves in the direction to be retracted, and the connecting portion 78 of the claw member 70 moves to the fifth position.
As shown in Figure (b), move the claw member
By guiding the claws 72 of the 70 and the outer surface 74 of the 72,
Guide surfaces 84, 84 for holding the pipe 9 by the 72, 72 so as to chuck the pipe 9 are formed. This guide surface 84, 84
Is formed in an arc shape having a curvature radius larger than the curvature radius of the outer side surface 74 of the claw portion 72 by the fitting margin.

Further, a hole 86 for inserting the pin 85 is formed in the tip portion 81, and in a state where the pin 85 is inserted through the hole 86, the pin 87 is screwed into the hole 86. 85 is prevented from coming off. As described above, the pin 85 is fitted in the grooves 79, 79 provided in the leaf spring portions 77, 77 of the claw member 70, and prevents the claw member 70 from rotating while allowing the claw member 70 to move in the retracted direction. It is supposed to do.

Further, at the base end of the base end portion 80, a through hole 88 for pushing the claw member 70 in the protruding direction by a piston member described later.
Has been drilled.

As shown in FIG. 6, the holder member 71 is detachably attached to the cylinder member 89. This cylinder member 89
Is formed in a substantially cylindrical shape, and a cylindrical recess 90 for mounting the holder member 71 is opened at the tip thereof. A groove 91 for positioning is formed on the outer peripheral surface of the base end portion 80 of the holder member 71. When the holder member 71 is fitted in the recess 90, it is aligned with the groove 91 for positioning and bolted.
By screwing 92 and fixing with nut 93,
It is mounted in place. Therefore, these bolts 92 and nuts 93 allow the collet chuck 10 to be exchanged for another size.

A piston member 94 is slidably housed inside the cylinder member 89, and the piston member 94 is sealed by a seal member 94a mounted on the outer peripheral surface thereof. The piston member 94 has a discharge end portion 95 at one end, and the shaft portion 95 is mounted in the recess 90 through a through hole 96 formed at the tip end side of the cylinder member 89. The claw member 70 of the collet chuck 10 can be pushed in the protruding direction. In the figure, 97 indicates a boss attached to the through hole 96.

A set screw 97, which is the stroke end of the piston member 94, is screwed to the base end of the cylinder member 89.

Further, the cylinder member 89 is rotatably held in the housing 98. That is, bearings 99 and 99 are mounted on the outer circumference of the cylinder member 89, and the cylinder member 89 is rotatable via the bearings 99 and 99. By rotating the cylinder member 89, the collet chuck 10 is also rotatable. Further, the housing 98 is provided with an air insertion port 100 into which air for reciprocating the piston member 94 is inserted.
In the figure, 89a indicates a seal member provided on the outer peripheral surface of the cylinder member 89.

Further, a nut 101 for preventing the cylinder member 89 from falling off is screwed to the base end of the cylinder member 89.

Further, a pulley 102 for rotationally driving the cylinder member 89 is fixed to the outer periphery of the cylinder member 89 on the front end side. As shown in FIG. 7, the pulley 102 is rotatably driven at a predetermined timing by a belt 103 wound around the pulley 102. The collet chuck 10 fixed to the cylinder member 89 is rotatable.

Then, in order to perform cutting processing such as grooving on the ends of the pipes 9, 9, ..., The pipes 9, 9, ...
The XY table 7 is moved to a predetermined position while being held by 10, 10 ... and the tail centers 11, 11 ..., and the end portions of the pipes 9 and 9 (A and B in FIG. 3) to be processed first are processed.
Position) is aligned with the optical axis position of the laser light of the processing heads 2 and 3. In this state, the processing heads 2 and 3 irradiate the ends of the pipes 9 and 9 with laser light spots to start processing, and the XY table 7 is moved along the processing shape by an NC controller (not shown). , Pipe 9, 9
For example, cutting processing as shown in FIG. After that, move the XY table 7 and move all the pipes 9, 9
The same processing is sequentially applied to.

The processing head that performs laser processing as described above is
At least one comprises a head body, a laser beam focusing section, and a focusing section moving means, the head body has a laser optical waveguide inside, and the laser beam focusing section is focused inside. An optical lens, and the condensing unit moving means,
It is configured to include a condensing unit fine movement means for finely moving the laser light condensing unit with respect to the head main body in a direction perpendicular to the traveling direction of the laser light passing through the waveguide.

In this embodiment, both processing heads 2 and 3 have the same configuration, and the configuration of the processing head 3 will be described here. Moreover, both processing heads do not necessarily have to have the same configuration, and one processing head, for example, the processing head 2 does not need to be provided with the condensing portion moving means.

As shown in FIG. 9, the head body 13 of the processing head 3 includes a supply pipe 14, a flange member 15, and a holding member 16.
And a tubular member 17, the head body 13 is
It has a laser optical waveguide 18 inside. Supply pipe 14
Is attached to the base frame 1 by a feed screw 4 so as to be movable in the X direction.
Laser light is supplied from a laser light source (not shown) so as to pass through the center of the inside. The laser light is supplied to the center of the inside of the supply pipe 14 even when the position is moved by the feed screw 4.

Also, a flange portion provided at the tip of the supply pipe 14
A flange member 15 is fastened to 19 by a bolt 20, and the flange member 15 is formed in a tubular shape having an opening 21 having an inner diameter slightly larger than that of the supply pipe 14.
On the end surface of the flange member 15, concave grooves 23, 23 ... For fitting one ends of coil springs 22, 22 ...
However, six holes are provided along the circumferential direction.

Further, a holding member 16 for holding the tubular member 17 in a tiltable manner is fastened to the flange member 15 with bolts 24. The holding member 16 is formed in a pipe shape having a large outer diameter similar to the outer diameter of the flange portion 19 of the supply pipe, and a flange portion 25 is provided at a tip portion thereof so as to project inward in the inner circumferential direction. And this flange part 25
An annular holding portion 26 is formed inside.

Further, a detection ring 28 is fixed to the outer surface of the flange portion 25 with a screw 29 via an insulating ring 27, and the detection ring 28 is arranged concentrically with the supply pipe 14.

The tubular member 17 whose proximal end portion is inserted into the holding member 16 is formed in a pipe shape whose outer diameter is smaller than the inner diameter of the detection ring 28 by about 0.2 to 0.3 mm and whose inner diameter is equal to that of the supply pipe 14. There is. A tubular member is provided on the proximal end side of the tubular member 17.
A fulcrum member 30 for holding 17 in a tiltable manner on a holding member 16
Is screwed on. The outer peripheral end 30a of this fulcrum member 30 is
It is formed in a circular arc shape with a predetermined radius of curvature,
The outer peripheral end 30a is housed so as to contact the inner peripheral surface of the holding portion 26 of the holding member 16. In the figure, 31 denotes a lock nut screwed to the base end of the tubular member 17 in order to prevent the fulcrum member 16 from loosening.

When an undesired external force is applied to the tip of the processing head 3, the outer peripheral end 30a of the fulcrum member 30 in the same direction as the direction in which the external force is applied is used as a fulcrum to support the operation of the processing head 3 as shown in FIGS. As shown in, the tip of the processing head 3 tilts.

Further, return coil springs 22, 22, ... Are housed on the back side of the fulcrum member 30 so that the tip of the processing head 3 returns to the normal position when the external force ceases to act. . That is, on the back side of the fulcrum member 30, as shown in FIG. 12, an annular spring seat 32 is abutted,
The spring seat 32 has six coil springs 22, 22 ...
Are formed with concave grooves 33, 33 ... Further, the other ends of the coil springs 22, 22 ... Are fitted in the concave grooves 23, 23 ... Of the flange member 15. Then, the resilient force of the coil springs 22, 22 urges the fulcrum member 30 in a direction of pressing the fulcrum member 30 against the inner surface of the flange portion 25 of the holding member 16, thereby returning the tip end portion of the processing head 3 to a normal position. It is designed to let you.

The coil springs 22, 22, ... By acting on the back surface of the fulcrum member 30 via the spring seat 32, even when the fulcrum member 30 or the tubular member 17 is rotated during assembly,
Spring seat 32 holding one end of the coil springs 22, 22 ...
However, since it slides in the radial direction with respect to the fulcrum member 30 and the force in the twisting direction does not act on the coil springs 22, 22, ..., It is possible to prevent the coil springs 22, 22 ,.

Further, a flange portion provided at the tip of the tubular member 17
As shown in FIG. 13, a laser beam focusing unit 35 of the processing head 3 is attached to the unit 34 so as to be slidable in the horizontal direction.
In addition, the laser light condensing unit 35 includes a lens case 36,
The lens holder 46, the lock nut 50, the slide case 52, the nozzle holder 56, and the nozzle 62 are provided.

That is, the lens case 36 is formed in the shape of a relatively thick pipe having an inner diameter slightly larger than that of the tubular member 17. At the base end of the lens case 36, a thick flange portion 36a is provided. And the tubular member 1
As shown in FIG. 14, key grooves 37, 37 are formed in parallel with each other on the opposing surfaces of the flange portion 34 of 7 and the flange portion 36a of the lens case 36. Is
The elongated rectangular parallelepiped keys 38, 38 are fitted. Therefore, the lens case 36 is slidable in the horizontal direction by the keys 38, 38 and the key grooves 37, 37.

The direction in which the lens case 36, that is, the laser beam focusing portion 35 of the processing head slides, is a direction (Y direction) orthogonal to the moving direction (X direction) of the entire processing head 3, as shown in FIG. ing. The flange portion of the tubular member 17
34 and the flange 36a of the lens case 36 are
It is connected slidably in the horizontal direction by 9… and is prevented from coming off.

Further, at one end of the flange portion 34 of the tubular member 17, an arm portion 40 fastened by a bolt 41 is provided to project laterally, and this arm portion 40 has a micro head of a micrometer.
42 is installed. As is well known, the micro head 42 rotates the operating portion 43 to move the moving shaft 44.
Is moved in the unit of μm, and the moving shaft 44 is configured to move only in the moving direction and not to rotate in the circumferential direction. The moving shaft 44 of the micro head 42 is connected to the lens case 36, and the lens case 36 can be slid along the Y direction by operating the operating portion 44 of the micro head 42. In the figure, reference numeral 45 designates a passage for cooling gas supply which is formed in the lens case 36.

A lens holder 46 is screwed onto the inner peripheral surface of the front end of the lens case 36. The lens holder 46 is formed in a cylindrical shape, and a flange portion 47 is provided at the tip end portion thereof so as to protrude toward the inner circumference. Further, in the lens holder 46, a condenser lens 48 for focusing the laser light in a spot shape is housed so as to abut the flange portion 47, and the condenser lens 48 includes a packing 49 and a lens. It is fixed by the clamper 50. As the condensing lens 48, for example, a carbon dioxide gas condensing lens made of ZnSe is used. Further, as the packing 49, as shown in FIG. 15, a cylindrical member made of metal such as aluminum is provided with a large number of notches in the circumferential direction.
By inserting 49a ..., it is possible to absorb the deformation in the axial direction.
This is for absorbing the force applied to the condenser lens 48 when the thermal expansion of the like.

In addition, the lock nut is attached to the outer periphery of the tip of the lens case 36.
50 is screwed on. The lock nut 50 forms an annular passage 51 with the lens holder 46 in a state where the lock nut 50 is screwed to the outer periphery of the front end portion of the lens case 36, and the front end portion serves to attach the slide case 52. . That is, the flange portion 53 is provided at the tip of the lock nut 50 so as to project inward.
With the flange portion 54 projecting outwardly engaged with the base end portion of the slide case 52, the lock nut 50 is screwed to the lens case 36, so that the base end portion of the slide case 52 becomes the lens. The holder 46 can be mounted in contact with the front end surface of the holder 46.

Further, a plurality of recessed grooves 55, 55 ... Are bored in the circumferential direction at the base end portion of the slide case 52, and the cooling case is introduced from the cooling gas supply passage 45 through the passage 51. Gas
It can be supplied to the tip of the processing head 3 through the concave grooves 55, 55 ....

Further, in the slide case 52, a substantially cylindrical nozzle holder 56 is fitted slidably in the vertical direction,
A screw 57 for position adjustment is screwed into the nozzle holder 56. The inside of the nozzle holder 56 is tapered inward and mirror-finished. Further, an O-ring 58 is attached to the outer periphery of the base end portion of the nozzle holder 56 to prevent the cooling gas from leaking when the nozzle holder 56 slides in the vertical direction.

A front circular groove 59 is formed at the tip of the nozzle holder 56, and a disk-shaped nozzle adjuster 60 is slidably accommodated in the groove 59 in the horizontal direction. Further, the concave groove 59 is covered with a cover 61 in a state where the nozzle adjuster 60 is accommodated. A tapered nozzle 62 is fixed to the nozzle adjuster 60,
The nozzle 62 is made of brass or the like in order to reflect the laser light efficiently. In addition, the nozzle holder 56
As shown in FIG. 16, four adjusting screws 63, 63 ... Are screwed at positions facing each other, and by moving the nozzle adjuster 60 by these adjusting screws 63, 63. The position of the nozzle 62 can be adjusted.

The material of the constituent members of the processing heads 2 and 3 is not particularly limited, but it is preferable to use aluminum or the like in consideration of the weight, the reflection characteristics of laser light, and the like.

In the above structure, the collet chuck according to this embodiment is used to process the end of a pipe or the like as follows. That is, as shown in FIG. 5 (a), with the end portion of the pipe 9 which is the member to be chucked fitted and held by the tail center 11, the mounting board 12 to which the tail center 11 is attached is attached to the air cylinder 13 '. To move in the pushing direction. Then, the tip of the pipe 9 is abutted against the abutting portions 75 of the open claws 72, 72 of the collet chuck 10, and the claw member 70 is retracted into the recess 83 of the holder member 71.
At that time, the claw portions 72, 72 of the claw member 70 are arranged in the manner shown in FIG.
As shown in (c), the outer surfaces 74, 74 have holder members 71.
The pipe 9 is guided by guide surfaces 84, 84 formed on the inner surface of the distal end of the pipe and moves so as to sandwich the pipe 9. Then, with the claw member 70 completely retracted into the recess 83 of the holder member 71, the pipe 9 has an outer peripheral surface formed by the claw portions 72, 72.
It is clamped from 0 degree different direction.

In this state, as shown in FIG. 4, the end portion of the pipe 9 can be subjected to predetermined processing by the laser processing head 2 or 3.

Next, in order to process the pipe 9 from different directions by 180 degrees, the belt 103 wound around the pulley 102 is driven by a driving means (not shown) so that the belt 103 is hooked as shown in FIG. The rotated pulley 102 is rotated 180 degrees. Then, the pipe 9 can be processed from directions different by 180 degrees. FIG. 8 shows the processed pipe.

Then, the processed pipe 9 is attached to the collet chuck 10
5 (c), air is inserted into the cylinder member 89 from the air insertion port 100, and the piston member 94 is moved to the right in the figure by the pressure of the air to move the piston member 94 to the right. The connecting portion of the claw member 70 by the shaft portion 95 of
Push 78. Then, the claw member 70 protrudes from the recess 83 of the holder member 71, and the claw portions 72, 72 cause the leaf spring portion 77,
The elastic force of 77 moves in the separating direction to release the pinched state of the end portion of the pipe 9.

In this way, by bringing the tip end surface of the pipe 9 as the member to be chucked into contact with the abutting portions 75, 75 of the claw portions 72, 72, the claw member 70 is retracted into the holder member 71, and at that time, The claws 72, 72 are moved so as to clamp the pipe 9 by the guide surfaces 84, 84 of the holder member 71, and the end of the pipe 9 is clamped by the pair of claws 72, 72. These claws 72,
72 holds the pipe 9 from 180 degrees different direction,
The end of the pipe 9 can be processed from a position different by 180 degrees.

[Advantages of the Invention] The present invention has the above-mentioned configuration and operation, and clamps the end of the chucked member only from a direction different by 180 degrees, and the end of the chucked member in the direction orthogonal to the clamping direction is clamped. A claw member to be exposed and a holder that holds the claw member so as to be retractable and capable of preventing the claw member from rotating and coming off, and exposing an end of a chucked member in a direction orthogonal to a direction in which the claw member is sandwiched. Since it is composed of members, it is possible to hold the end of the work piece such as a round bar or pipe so that it can be processed from a position different from 180 degrees while still holding the end so that it can be processed. A collet chuck capable of being provided can be provided.

Further, according to the present invention, the claw member is held in the holder member so as to be retractable, and the claw member starts the chucking operation of the chucked member with the pair of claw portions projecting outward from the holder member and opened to each other. Since the above-mentioned claw member moves from a state in which the pair of claw portions project outward from the holder member to a state in which the claw member is retracted in the holder member, the amount of movement of the claw member should be large. Even if the chucked member is sandwiched only from directions different by 180 degrees, the chucked member can be reliably chucked while the end portion of the chucked member is exposed to the outside and can be processed.

Moreover, in this invention, since the chucking operation of the chucked member is started in the state where the pair of claw portions of the claw member protrudes outward from the holder member and are opened to each other, the chucking operation of the chucked member is started in a pair. The claws are opened in a taper shape, and the ends of the chucked member are guided by the claws that open in a taper shape to ensure that the ends of the chucked member are abutted against the abutting parts of the claws. The chucking operation of the chucked member can be reliably performed even if the chucked member is sandwiched only from the directions different by 180 degrees.

Further, in this invention, since the tapered claw portion has a function of guiding the end portion of the chucked member, it is necessary to form a tapered surface for guiding the end portion of the chucked member on the tip end surface of the claw portion. The entire length of the claw portion can be contributed to the clamping of the chucked member, and the chucked member can be chucked with a sufficient clamping force even if the chucked member is clamped only from 180 ° different directions. Is possible,
It is possible to reliably prevent the chucked member from falling off during processing.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a collet chuck according to the present invention, FIG. 2 is a structural view showing a laser processing device, and FIG. 3 is a plan view showing a state in which a chucked member is held. FIG. 4 is a side view showing a processed portion of a chucked member, FIGS. 5 (a) to 5 (c) are sectional views showing the operation of the collet chuck, and FIG. 6 is a sectional view showing the collet chuck. Figure is a front view showing the mechanism for rotating the pulley, Figure 8 is a perspective view showing the machined pipe, Figure 9 is a sectional view showing the laser machining head, and Figure 10 is the tilted state of the laser machining head. Partially broken front view,
11 (a) and 11 (b) are enlarged cross-sectional views of a main part showing different states of FIG. 10, FIGS. 12 and 14 are exploded perspective views of the laser processing head, and FIG. 13 is a laser processing head. Partial perspective view, Fig. 15 is a front view showing packing, Fig. 16
Figure is a bottom view of the laser processing head, Figure 17 is a side view showing the processed part of the chucked member, Figures 18 and 19 are front views showing a conventional chuck, respectively, and Figure 20 is a cross section of Figure 19. It is a figure. [Explanation of Codes] 9 ... Pipe 10 ... Collet chuck 70 ... Claw member 71 ... Holder member 72 ... Claw 77 ... Connection part

Claims (1)

[Scope of utility model registration request] 1. A claw member for clamping an end of a member to be chucked only from a direction different from 180 degrees and exposing an end of the member to be chucked in a direction orthogonal to the clamping direction; And a holder member that holds the claw member so as to prevent the claw member from rotating and coming off, and exposes an end portion of the chucked member in a direction orthogonal to the holding direction of the claw member. A pair of claw portions provided with an abutting portion for immersing the claw member in the holder member by abutting the end portions only from directions different from each other by 180 degrees and contacting the tip end surface of the chucked member, and A pair of leaf springs connected so as to bias the pair of claws in a direction of separating from each other, and a connecting portion that connects the base end portions of the pair of leaf springs, and the holder member is a claw. When the member is immersed, The pair of claws is provided with a guide surface for moving the claws so as to sandwich the chucked member, and the claw member has a pair of claws protruding outwardly from the holder member and opened with respect to the chucked member. The chuck operation is started, and the tip portions of the chucked member are brought into contact with the abutting portions of the pair of claw portions to immerse the claw portions in the holder member, and the pair of claw portions are sunk in the holder member. At this time, the pair of claw portions are moved so as to sandwich the chucked member by the guide surface of the holder member, and the chucking operation of the chucked member is completed with the pair of claw portions retracted into the holder member. Collet chuck characterized by.