JPH11179690A - Workpiece holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely hold a workpiece with uniform force, improve work efficiency or conveying dfficiency of the workpiece, without causing its deformation. SOLUTION: This device comprises a holding finger 5, conical or spherical fitting part 5a formed in a tip end of the holding finger 5, operating rod 6 fitted to slide in the holding finger 5, wedge member 7 fixed to a tip end of the operating rod 6 to be formed with a conical or spherical fitting part 7a, a plurality of press members 9a to 9c fitted between the holding finger 5 and the wedge member 7 to be arranged movably in a radial direction, and an elastic ring 10 mounted in the periphery of each press member. In this way, relating to a workpiece 1 having a shaft hole 1c, by pressing an internal peripheral surface of the shaft hole by the press member, the workpiece is held.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a work holding device for detachably holding a work on an automatic processing line for works such as small precision parts or a work transfer line for small works.

[0002]

2. Description of the Related Art For example, precision parts that require processing accuracy on the order of microns, such as a magnetic head carriage of a hard disk drive (HDD) for a computer,
A method of cutting and polishing a product formed by extruding or drawing aluminum is employed.

FIG. 9 is a perspective view of the carriage.
The carriage 1 includes a base 1a, and a plurality of plate portions (arm portions) 1b integrally formed in a comb shape so as to extend in parallel from the base 1a, and a number of slits 1f are formed between the plate portions 1b. It has a structure. In addition, 1
g and 1h are holes for passing screws. A shaft hole 1c for supporting the carriage 1 is formed in the base portion 1a, and a head mounting hole 1d for mounting a magnetic head and a plate mounting portion 1d are formed at the tip of each plate portion 1b.
An opening 1e for reducing the weight of b is formed by cutting. Then, the plurality of arms 1b move so as to project between the plurality of disks of the HDD, and the magnetic head reads the information of the disks. Burrs are generated by cutting on the outer periphery of each plate portion 1b and the corners of the shaft holes 1c and 1d and the opening 1e. If assembled as it is, the burrs contact the disk to scratch the disk surface, Since there is a problem that burrs are caught in the gap or cutting chips fall on the disk and the disk or the head is damaged, it is necessary to surely perform deburring and chamfering of each part.

[0004]

When the deburring and chamfering of the carriage are performed on an automated line, the base 1a of the carriage 1 may be gripped by a robot hand. For example, in Japanese Utility Model Publication No. 4-17353, The three chuck claws 14 are enlarged in diameter by the wedge member 13 to hold the work.
4 is supported by the support plate 19 with the pins 143, so that the structure is complicated and large, and there is a drawback that it cannot enter a small hole. Further, in the deburring and chamfering process of the carriage, since a strong force acts on the carriage, it is difficult to hold the carriage at the position. However, there is a problem in that the carriage made of is deformed. This problem is the same in an automatic processing line for work of small precision parts or the like or in a work transfer line for small work parts or the like.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and can reliably hold a work with a uniform force without deforming the work, thereby improving the work efficiency or the transfer efficiency of the work. It is an object to provide a work holding device.

[0006]

According to a first aspect of the present invention, there is provided a workpiece holding apparatus comprising: a holding finger; and a conical or spherical shape formed at a tip of the holding finger. A fitting portion 5a, an operating rod 6 slidably fitted in the holding finger, and a wedge member 7 fixed to the tip of the operating rod 6 and having a conical or spherical fitting portion 7a formed thereon A plurality of pressing members 9a to 9c fitted between the holding finger 5 and the wedge member 7 and movably arranged in the radial direction, and an elastic ring 10 mounted on the outer periphery of each pressing member. The invention according to claim 2, wherein the work is held by pressing the inner peripheral surface of the shaft hole by the pressing member against the work 1 having the shaft hole 1c. Projecting part 5a of the finger 5 Guide member 17 which is provided to
And a guide groove 15 formed at the other end of each of the pressing members 9a to 9c, wherein the guide member 17 is engaged with the guide groove 15. The invention according to claim 3, wherein And a guide pin 19 provided so as to protrude from the fitting portion 5a of the holding finger 5, and the guide pin 19 is disposed between the adjacent pressing members 9a to 9c. According to a fourth aspect of the present invention, in the first aspect, between the wedge member 7 and the holding finger 5,
Intermediate body 30 having fitting portions 5a, 7a on upper and lower surfaces
Is mounted between the wedge member 7 and the intermediate body 30 and between the wedge member 7 and the intermediate body 30.
Pressing members 9a to 9
9c is mounted, the invention according to claim 5, wherein the holding finger 5, a plurality of pressing members 21a to 21d formed on the tip side of the holding finger, and the inner peripheral surface of these pressing members , An elastic ring 22 attached to the outer periphery of the distal end of each pressing member, an operating rod 6 slidably fitted in the holding finger, and a distal end of the operating rod. And a conical fitting portion 6a fitted to the tapered surface of the pressing member, and pressing the inner peripheral surface of the shaft hole by the pressing member against the work 1 having the shaft hole 1c. The invention according to claim 6 is characterized in that the pressing members 9a to 9c, 21a to 2
It is characterized in that fluid is supplied to the shaft hole of the work from inside 1d. Note that the numbers added to the above configuration are compared with the drawings for easy understanding of the present invention, and the present invention is not limited thereto.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of a work holding device according to the present invention. FIG. 1 (A) is an axial sectional view of the work holding device, and FIG. 1 (B) is BB of FIG.
It is sectional drawing seen in the arrow direction along the line.

In FIG. 1A, a work holding device 2
Is connected to a cylinder 3, a piston 4 fitted reciprocally in the cylinder 3 and driven by hydraulic pressure or pneumatic pressure, a cylindrical holding finger 5 fixed to the cylinder 3, and one end connected to the piston 4. Operating rod 6 slidably fitted in holding finger 5 and operating rod 6
A wedge member 7 fixed to the other end by a screw, and a pressing unit 9 fitted to the tip of the holding finger 5 and the wedge member 7 and disposed around the operating rod 6.

A conical fitting portion 5a is integrally formed at the tip of the holding finger 5, and a step 5c for work locking is formed below the fitting portion 5a. On the lower surface of the wedge member 7, an inverted conical fitting portion 7a is formed.
As shown in FIG. 1B, the pressing unit 9 includes three pressing members 9a, 9b, 9 disposed around the operating rod 6.
c, and two rows of grooves are formed on the outer periphery of each of the pressing members 9a to 9c.
0 is fitted, and each of the pressing members 9 a to 9
9c does not come off.

FIG. 2 shows the details of the pressing member of FIG. 1, and FIG. 2 (A) is a side view of the pressing member, FIG. 2 (B) is a diagram viewed from the direction B of FIG. FIG. 2C is a view of FIG. 2A viewed from above. Since the pressing members 9a to 9c in FIG. 1 have the same shape, the pressing member 9a will be described.

As described above, the outer periphery of the pressing member 9a
Grooves 11 are formed in the rows. The pressing member 9a has an arcuate curved vertical surface portion 12 formed at an inner peripheral side central portion thereof,
Inverted conical portion 13 formed at one end of vertical surface portion 12
A conical portion 14 formed at the other end of the vertical surface portion 12,
The conical portion 14 has a guide groove 15 formed in a vertical direction. In addition, the fitting portion 5a of the holding finger 5,
The shapes of the fitting portion 7a of the wedge member and the inverted conical portions 13 and 14 of the pressing members 9a to 9c are designed to be the same.

FIG. 3A is a front view showing the tip of the holding finger shown in FIG. 1, and FIG. 3B is an enlarged sectional view showing the engagement state between the holding finger and the pressing member. FIG.
In (A), three key grooves 16 penetrating the rod insertion hole 5b are formed on the outer periphery of the fitting portion 5a at the tip of the holding finger 5. Then, as shown in FIG. 3 (B), a key (guide member) 17 is inserted into the key groove 16 and fixed with an adhesive.
a to 9c are engaged with the guide grooves 15 of the pressing members 9a to 9c.
9c is configured to slide smoothly in the axial direction.

FIG. 4 shows the operation of this embodiment having the above configuration.
Will be described with reference to FIG. 4 shows a state where the work is held from the state shown in FIG. 1, FIG. 4 (A) is an axial sectional view of the work holding device, and FIG. 4 (B) is along the line BB in FIG. 4 (A). FIG.

FIG. 1 shows a state in which the operating rod 6 of the holding finger 5 is inserted into the shaft hole 1c of the work 1. When the piston 4 is retracted from this state as shown by the arrow in FIG. The fitting portion 7a of the member 7 has pressing members 9a to 9c.
And at the same time, the inverted conical portions 14 at the other ends of the pressing members 9a to 9c are fitted along the fitting portions 5a of the holding fingers 5. At this time, since the guide member 17 fixed to the fitting portion 5a of the holding finger 5 is engaged with the guide groove 15 of the pressing members 9a to 9c, each of the pressing members 9a to 9c moves along the fitting portion 5a. The sliding movement of the wedge member 7 in the axial direction causes the pressing members 9a to 9c to move the elastic ring 1 by the action of the fitting portion 7a of the wedge member 7 and the fitting portion 5a of the holding finger 5.
The work 1 is uniformly pressed against the inner peripheral surface of the shaft hole 1c of the work 1 as shown in FIG. 4, so that the work 1 can be reliably held. At this time, the holding force of the work can be freely adjusted by controlling the hydraulic or pneumatic pressure. When the holding of the work 1 is released, when the piston 4 is advanced, the fitting portion 7a of the wedge member 7 retreats from the inverted conical portion 13 of the pressing members 9a to 9c, so that the pressing members 9a to 9c 10
Moves inward, and the holding of the work 1 is released.

In the above-described embodiment, the pressing unit 9 is divided into three parts. However, the present invention is not limited to this. It is important that the pressing unit 9 is divided into plural parts.
Further, in the above embodiment, the fitting portion 5a of the holding finger 5, the fitting portion 7a of the wedge member 7, and the pressing members 9a to
Although the shape of the conical portions 13 and 14 of 9c is a conical shape, the shape may be a curved surface such as a spherical surface, that is, a surface in which each portion is at least in line contact.

Next, another embodiment of the work holding device of the present invention will be described. In the following description of the embodiment, the same components as those of the above-described embodiment will be denoted by the same reference numerals, and description thereof will be omitted.

FIG. 5 shows another embodiment of the work holding device of the present invention. FIG. 5 (A) is a sectional view taken along the line AA of FIG. B) is B in FIG.
It is sectional drawing seen in the arrow direction along the -B line. In the present embodiment, concave portions 18 are formed at both inner end portions of the pressing members 9a to 9c, and three guide pins 19 are erected on the fitting portion 5a of the holding finger 5, and the guide pins 1 are provided.
9 faces between the concave portions 18 of the adjacent pressing members 9a to 9c. According to the present embodiment, each of the pressing members 9 a to 9 c can be smoothly slid in the axial direction along the guide pin 19 with a simple configuration.

FIG. 6 is a sectional view showing another embodiment of the work holding device of the present invention. In the present embodiment, an intermediate body 30 having a conical fitting portion 5a on the upper surface and an inverted conical fitting portion 7a on the lower surface is mounted between the wedge member 7 and the holding finger 5, A pressing member 9 is provided between the wedge member 7 and the intermediate body 30 and between the intermediate body and the holding finger 5 respectively.
a to 9c are attached. As a result, a plurality of works can be held by one device.

7 and 8 show another embodiment of the work holding device of the present invention. FIG. 7 (A) is an axial sectional view of the work holding device, and FIG. 7 (B) is FIG. 7 (A). 8 is an axial sectional view showing a state where the work is held from the state shown in FIG. 7 in the direction of the arrow along the line BB.

In FIG. 7A, the work holding device 2
Is connected to a cylinder 3, a piston 4 fitted reciprocally in the cylinder 3 and driven by hydraulic pressure or pneumatic pressure, a cylindrical holding finger 5 fixed to the cylinder 3, and one end connected to the piston 4. And an operating rod 6 slidably fitted in the holding finger 5.

The holding finger 5 has an annular base 20 fixed to the piston 3 side and a step 5c for work locking.
And four pressing members 21a, 21b, 21c, and 21d formed on the distal end side from the base portion 20, and an elastic ring 22 is attached to an outer peripheral portion of the distal end of each of the pressing members 21a to 21d. 22 is fixedly fastened by a cap 23. It is designed such that when each of the pressing members 21a to 21d is tightened, a gap 27 is formed between each of the pressing members 21a to 21d. Each pressing member 21a-2
1d, an inner peripheral surface is formed with a tapered surface 25 whose diameter decreases toward the tip, and a fluid supply hole 20a for oil, air or water is formed in the base 20, and a fluid supply hole 2a is formed.
0a is connected to a pump not shown.

On the other hand, a conical fitting portion 6a, which is fitted to the tapered surface 25 of the pressing members 21a to 21d, is integrally formed at the tip of the operating rod 6. A fluid passage 26 is provided between the operating rod 6 and the lower part of the holding finger 5.
Are formed. Further, a fluid passage 6b is formed in the center of the operating rod 6 in a radial direction, and a fluid passage 6c communicated with the fluid passage 6b and opened on the upper surface.
Are formed in the axial direction.

FIG. 8 shows the operation of the present embodiment having the above configuration.
Will be described with reference to FIG. FIG. 7 shows the holding finger 5.
7A is inserted into the shaft hole 1c of the work 1, and when the piston 4 is advanced from this state as shown by the arrow in FIG. 7A, the fitting portion 6a of the operating rod 6 causes the pressing members 21a to
8D, the pressing members 21a to 21c are radially expanded against the elastic ring 22 by the axial movement of the operating rod 6, and finally, as shown in FIG.
As shown in (1), the workpiece 1 is uniformly pressed against the inner peripheral surface of the shaft hole 1c, and the workpiece 1 can be reliably held.
At this time, the holding force of the work 1 can be freely adjusted by controlling the hydraulic or pneumatic pressure. When the holding finger 5 is inserted into the shaft hole 1c of the work 1, after the fluid is ejected from the fluid supply hole 20a, the fluid passages 26, 6b, 6c and the gap 27 into the shaft hole 1c of the work 1,
Foreign substances such as burrs which are discharged to the outside through the holes 1g and 1h and adhere to the shaft hole 1c at the time of processing the work are removed, thereby preventing the work 1 from being stuck by the burrs.

It should be noted that the fluid supply system of the present embodiment can be employed in each of the above embodiments. In that case,
A fluid passage may be formed in the holding finger 5.

Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications can be made. For example, in the above embodiment, the holding of the magnetic head carriage has been described as an example.
The present invention is not limited to this, and can be applied to any work having a shaft hole or any work in which a hole is formed.

[0026]

As is apparent from the above description, according to the present invention, it is possible to reliably hold a work with a uniform force without deforming the work, and to improve the work efficiency or the transfer efficiency of the work. it can.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a work holding device of the present invention,
FIG. 1A is an axial sectional view of the work holding device, and FIG.
FIG. 2B is a cross-sectional view taken along the line BB of FIG.

2 (A) is a side view of the pressing member, FIG. 2 (B) is a diagram viewed from a direction B of FIG. 2 (A), and FIG. 2 (C). FIG. 2B is a diagram of FIG. 2A as viewed from above.

3 (A) is a front view showing a tip of the holding finger of FIG. 1, and FIG. 3 (B) is an enlarged sectional view showing an engagement state between the holding finger and a pressing member.

FIG. 4 shows a state where the work is held from the state of FIG. 1,
FIG. 4A is an axial sectional view of the work holding device, and FIG.
FIG. 4B is a cross-sectional view taken along the line BB of FIG.

5A and 5B show another embodiment of the work holding device of the present invention, and FIG. 5A is a cross-sectional view taken along the line AA of FIG. FIG. 6 is a cross-sectional view taken along the line BB of FIG.

FIG. 6 is a sectional view showing another embodiment of the work holding device of the present invention.

7A and 7B show another embodiment of the work holding device of the present invention. FIG. 7A is an axial sectional view of the work holding device, and FIG.
FIG. 7B is a cross-sectional view taken along the line BB of FIG.

8 is an axial sectional view showing a state where the work is held from the state of FIG. 7;

FIG. 9 is a perspective view showing an example of a work to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Work, 1c ... Shaft hole 5 ... Holding finger, 5a ... Fitting part 6 ... Operating rod, 6a ... Fitting part 7 ... Wedge member, 7a ... Fitting part 9a-9c, 21a-21d ... Pressing member 10 , 22 ... elastic ring 15 ... guide groove 17 ... guide member 19 ... guide pin 23 ... tapered surface 30 ... intermediate

Claims (6)

[Claims] A holding finger; a conical or spherical fitting portion formed at a tip of the holding finger; an operating rod slidably fitted in the holding finger; A wedge member fixed to the distal end of the operating rod and formed with a conical or spherical fitting portion; and a plurality of wedge members fitted between the holding fingers and the wedge member and movably disposed in the radial direction. It is characterized by comprising a pressing member, an elastic ring attached to the outer periphery of each pressing member, and holding the work by pressing the inner peripheral surface of the shaft hole by the pressing member against the work having the shaft hole. Work holding device. A guide member provided to protrude from a fitting portion of the holding finger; and a guide groove formed at the other end of the pressing member, wherein the guide member is engaged with the guide groove. The work holding device according to claim 1, wherein: 3. The apparatus according to claim 1, further comprising a guide pin provided so as to protrude from a fitting portion of said holding finger, said guide pin being disposed between adjacent pressing members.
The work holding device as described in the above. 4. Between the wedge member and the holding finger,
2. The workpiece according to claim 1, wherein an intermediate body having fitting portions on the upper surface and the lower surface is mounted, and a pressing member is mounted between the wedge member and the intermediate body and between the intermediate body and the holding finger. Holding device. 5. A holding finger, a plurality of pressing members formed on the distal end side of the holding finger, a tapered surface formed on an inner peripheral surface of the pressing member, and an outer peripheral portion of a distal end of each pressing member. An attached elastic ring, an operating rod slidably fitted in the holding finger, and a conical fitting formed at the distal end of the operating rod and fitted to the tapered surface of the pressing member. A work holding device, comprising: a joint portion; and pressing the inner peripheral surface of the shaft hole by the pressing member against the work having the shaft hole. 6. The work holding device according to claim 1, wherein a fluid is supplied to the shaft hole of the work from inside the pressing member.