JP2001300830A - Work positioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To position even a work different in a hole diameter. SOLUTION: A reference part 19 parallel along a central shaft 18 is formed on a side surface of a stepped locating pin 13 of a work positioning device 1. A columnar large diameter part, an intermediate diameter part and a small diameter part are formed in a tip part 17 of the stepped locating pin 13, and the reference part 19 is formed in respective side parts. A width dimension up to the inverse side from the reference part 19 is intermittently enlarged toward the base end. An operating part 32 of a clamp plate 31 is housed in a groove 33 of the stepped locating pin 13, and a pin 36 is inserted into and supported by an elongate hole 35 of the clamp plate 31. The clamp plate 31 is journaled to an operating rod 38 of a clamp driving device 37 to form a link mechanism. The work positioning device 1 is provided with a locating pin driving device 51 for moving the stepped locating pin 13 in the shaft direction to vary a relative position of the stepped locating pin 13 and a claw part 43 of the clamp plate 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work positioning device for positioning a work such as a molded panel.

[0002]

2. Description of the Related Art Conventionally, as a device for positioning a work, there has been known a work positioning device having a locate pin inserted into a locate hole of the work (Japanese Patent Laid-Open No. 11-1999).
No. 235632).

In this work positioning device, a hook-shaped claw whose tip is bent is provided at the base end of the locating pin. The claw is moved downward in a radial direction by a driving device and then moved downward. It is configured to: Accordingly, in a state where the locating pin is inserted into the locating hole, the claw is moved in the radial direction to abut on the opening edge of the locating hole and is moved downward, so that the claw and the claw oppose each other. It is configured such that it can be positioned and fixed in a state where the opening edge of the locating hole is sandwiched by the provided receiving surface.

[0004]

However, in the above-described work positioning device, in the case of a work having a large-diameter locate hole exceeding the range of movement of the claw in the radial direction,
Could not position. Thus, there is a problem that a work positioning device corresponding to the large-diameter locate hole is separately required.

[0005] The present invention has been made in view of such conventional problems, and has as its object to provide a work positioning apparatus that can position even works having different hole diameters. .

[0006]

According to a first aspect of the present invention, there is provided a work positioning apparatus, comprising:
After inserting the locating pin into the hole formed in the work, a claw is projected from a side surface of the locating pin, and the claw is engaged with an opening edge of the hole to position the work. On the side surface, a reference portion that is in contact with the opening edge of the hole is formed in parallel along the center axis of the locating pin, and the width dimension from the reference portion to the side surface located on the opposite side of the reference portion is determined. A drive means for intermittently or continuously forming a large diameter from the distal end to the proximal end of the locate pin while projecting the claw from the reference portion, and moving the locate pin in the axial direction to move the locate pin and the claw. Moving means for changing the relative position with respect to.

That is, when positioning a work,
The locating pin is inserted into the hole of the work, and the locating pin is moved by the moving means to a position where the diameter of the locating pin matches the hole diameter. Then, the work is positioned by the driving means projecting the pawl from the side surface of the locate pin, and locking the pawl to the opening edge of the hole.

According to a second aspect of the present invention, in the workpiece positioning device, a receiving surface for holding the opening edge of the hole together with the claw is provided in a state where the claw is projected by the driving means, and the receiving surface is provided with: It was formed in the shape of a curved surface protruding toward the nail.

That is, the receiving surface for holding the opening edge together with the claw is formed in a curved surface, and makes line contact or point contact with the opening edge.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a work positioning device 1 according to the present embodiment, and shows a state where a work 2 is positioned.

The casing 1 of the work positioning device 1
1, a stepped locating pin 13 inserted into the locating hole 12 of the work 2 is disposed so as to be vertically movable in the longitudinal direction of the casing 11.
Has its tip protruding from the upper surface 14 of the casing 11. The stepped locating pin 13 is composed of a cylindrical body 16 housed in the casing 11 and a tip 17 formed at the tip of the body 16.
On the left side surface in FIG. 1 of the stepped locating pin 13, a reference portion 19 parallel to the central axis 18 of the stepped locating pin 13 is formed from the body portion 16 to the tip portion 17. .

The tip 1 of the stepped locate pin 13
As shown in FIG. 2, a first reduced diameter portion 21 decreases in diameter upward from the body portion 16 and a first reduced diameter portion 2.
1, a large-diameter portion 22, a second reduced-diameter portion 23 that decreases in diameter as going upward from the large-diameter portion 22, and a middle-diameter portion 24 connected to the second reduced-diameter portion 23. A third reduced-diameter portion 25 that decreases in diameter upward from the middle-diameter portion 24;
A small-diameter portion 26 connected to the reduced-diameter portion 25, and a conical portion 27 is formed at the tip of the small-diameter portion 26.
As shown in FIG. 3, the large-diameter portion 22, the middle-diameter portion 24, and the small-diameter portion 26 are formed in a column shape, and each side portion forms the reference portion 19. FIG.
It is arranged eccentrically to the middle left. As shown in FIG. 2, the outer diameter dimension a of the large diameter part 22 is formed to be larger than the outer diameter dimension b of the middle diameter part 24, and the outer diameter dimension b of the middle diameter part 24 is The smaller diameter portion 26 is formed to have a larger diameter than the large diameter dimension c. Thereby, the width dimension from the reference portion 19 to the side surface on the opposite side (right side in FIG. 2) of the reference portion 19 increases intermittently from the distal end to the proximal end of the stepped locating pin 13. Is formed.

As shown in FIG. 1, a clamp plate 31 is provided in the casing 11, and an L-shaped operating portion 32 is integrally formed at the tip of the clamp plate 31. I have. The operating portion 32 is provided with the stepped locate pin 13.
Is formed in a groove 33 formed in the reference portion 19, and a claw portion 34 is formed at the tip thereof which is bent to the side of the stepped locating pin 13. The clamp plate 31 has an elongated hole 35 formed in a crank shape in the vertical direction which is the longitudinal direction of the casing 11. The clamp plate 31 is provided with a pin 36 provided in the casing 11. By being inserted into the hole 35, it is supported movably up and down.

Below the clamp plate 31, a clamp driving device 37 as a driving means composed of an air cylinder is provided along the body 16 of the stepped locating pin 13 (a motor driven type is also possible). A link mechanism is formed by the operation rod 38 from the driving device 37 being pivotally supported on the base end of the clamp plate 31 (an arm type is also possible). Thereby, the clamp driving device 37
By moving the clamp plate 31 upward by projecting the operation rod 38, the claw portion 34 of the clamp plate 31 is brought into the inoperative state 41 in which the claw portion 34 of the clamp plate 31 is accommodated in the stepped locating pin 13 as shown in FIG. It is configured so that it can be formed.
Also, by retreating the operating rod 38 of the clamp driving device 37 and moving the clamp plate 31 downward, the claw portion 34 of the clamp plate 31 is moved from the stepped locating pin 13 as shown by a solid line in FIG. It is configured to be able to form an actuated state 42 which has been protruded and then moved downward. In this operating state 42, a receiving surface 44 for holding the opening edge 43 of the locate hole 12 together with the claw 34 is provided on the upper surface 14 of the casing 11 facing the claw 34. The surface 44 is formed in a spherical shape protruding toward the claw portion 34 as shown in FIG.

As shown in FIG. 1, a locating pin driving device 51 as a moving means for moving the stepped locating pin 13 in the axial direction is provided at the lower part of the work positioning device 1 at the body of the stepped locating pin 13. 16, and the locating pin driving device 51 is provided with the stepped locating pin 13 and the clamp plate 31 by operating an air cylinder (a motor-driven type is also possible) not shown.
The relative position with respect to the claw portion 43 can be changed. Thereby, as shown by the solid line in FIG. 1, the small-diameter portion 26 (see FIG. 2) of the stepped locating pin 13 is located at the claw portion 34 in the first locate state 52, as shown by the dashed line in FIG. 1. In addition, the second locate state 53 in which the middle diameter portion 24 (see FIG. 2) is located at the claw portion 34, and the large diameter portion 22 (see FIG. 2) as shown by a two-dot chain line in FIG. The third locate state 54 located on the claw portion 34 is formed.

Then, on the side of the casing 11,
A work detection sensor 62 is provided via an L-shaped bracket 61 in the vertical direction, which is the longitudinal direction of the casing 11, so that the presence or absence of the work 2 can be detected.

In the present embodiment having the above-described configuration, when positioning the work 2 such as a molded panel, the stepped locating pin 13 is inserted into the locating hole 12 opened in the work 2 and the locating hole 12 is inserted. Is brought into contact with the receiving surface 44 of the upper surface 14 of the casing 11. Next, the locating pin driving device 51 drives the stepped locating pin 13 to move the stepped locating pin 13 to a position where the diameter of the stepped locating pin 13 and the hole diameter of the locating hole 12 match. Thus, even if the locate hole 12 has a larger diameter than the small diameter portion 26 at the tip end side of the stepped locate pin 13, it is possible to form a state in which the diameter of the stepped locate pin 13 matches the hole diameter. Then, the clamp driving device 37 is driven to cause the claw portion 34 to protrude from the stepped locating pin 13 and move downward to form an operating state 42. The locating hole 12 is formed by the claw portion 34 and the receiving surface 44. Is fixed in a state where the opening edge portion 43 is sandwiched.

As described above, even if the hole diameter is large, the claw portion 34 can be securely locked to the opening edge 43 of the locate hole 12. Therefore, even if the workpieces 2 have different hole diameters, they can be positioned without changing the locate pins, and the workpiece positioning apparatus 1 alone can support various hole diameters. In addition, since the positioning is performed in a state where the diameter of the stepped locating pin 13 and the hole diameter match, the positioning in the radial direction can be reliably performed. Further, the stepped locating pin 13 and the clamp plate 31 are disposed movably in the longitudinal direction of the casing 11, and the clamp driving device 37 and the locating pin driving device 51 are provided along the trunk 16 of the stepped locating pin 13. Since the work positioning device 1 can be made slimmer than in the case where a moving mechanism for moving the claw in the lateral direction is provided, the space can be saved.
In addition to being able to perform positioning in a narrow portion, it is possible to reduce restrictions on peripheral equipment such as a gun and a gripper used for work processing. In addition, the driving force can be reduced and abrasion of the clamp plate 31 can be prevented, as compared with the related art in which the claw is moved downward while being pressed against the opening edge of the locate hole 12.

On the other hand, the receiving surface 44 for holding the opening edge 43 together with the claw portion 34 is formed in a spherical shape and can be brought into point contact with the opening edge 43. Accordingly, even when the work 2 is inclined or the shape of the work 2 changes, for example, a curved surface is formed, the work 2 can be reliably clamped correspondingly.

In this embodiment, the work 2
Although the case where the positioning is performed in a state where is supported from below is illustrated and described, the present invention is not limited to this. For example, according to the shape of the work 2, the work 2 is positioned from its side, or Positioning may be performed diagonally from below.

In this embodiment, the receiving surface 4
Although the case where 4 is formed in a spherical shape has been described as an example,
The present invention is not limited to this, and may be a flat surface.
In addition, the receiving surface 44 may not be provided. In this case, the work 2 is positioned in a state where the work 2 is prevented from falling out of the stepped locating pin 13 by being locked by the claw portion 34. Can be.

Further, in the present embodiment, by using the stepped locating pin 13, the locating hole 12
Has been described by taking as an example what can cope with the case of large diameter, medium diameter and small diameter. However, as shown in FIG. 5, a tapered surface 71 having a tapered surface 71 having a larger diameter from the distal end toward the proximal end. By using the attached locating pin 72, the range corresponding to the hole diameter can be expanded.

[0023]

As described above, in the work positioning device according to the first aspect of the present invention, by changing the insertion position of the locating pin inserted into the hole of the work, the hole has a large diameter. Also, it is possible to form a state in which the diameter and the hole diameter of the locating pin match. Therefore, it is possible to cope with various hole diameters, and to position even works having different hole diameters. In addition, since the positioning can be performed in a state where the diameter of the locating pin and the hole diameter match, the positioning in the radial direction can be reliably performed.

Further, in the work positioning device according to the second aspect, the receiving surface holding the opening edge of the hole together with the pawl can be brought into line contact or point contact with the opening edge. Thereby, even when the work to be positioned is inclined or the shape of the work changes, it is possible to cope with these cases.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part showing a stepped locating pin of the embodiment.

FIG. 3 is a plan view of the embodiment.

FIG. 4 is a side view of the embodiment.

FIG. 5 is a side view showing a taper locate pin used in place of the stepped locate pin of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Work positioning device 2 Work 12 Locating hole 13 Stepped locating pin 19 Reference part 22 Large diameter part 24 Medium diameter part 26 Small diameter part 34 Claw part 37 Clamp drive 43 Opening edge 44 Receiving surface 51 Locate pin drive 71 Tapered surface 72 Taper With locate pin

Claims (2)

[Claims] After inserting a locating pin into a hole formed in a work, a claw is protruded from a side surface of the locating pin,
In a work positioning device for positioning the work by locking the claw to an opening edge of the hole, a reference portion abutting on an opening edge of the hole is provided on a side surface of the locate pin along a central axis of the locate pin. While forming the width dimension from the reference portion to the side surface located on the opposite side of the reference portion from the distal end of the locating pin toward the proximal end side, intermittently or continuously with a large diameter, A work positioning apparatus comprising: a driving unit for projecting the claw from the reference portion; and a moving unit for moving the locating pin in an axial direction to change a relative position between the locating pin and the claw. 2. A receiving surface for holding the opening edge of the hole together with the claw in a state where the claw is projected by the driving means, and the receiving surface is formed into a curved shape protruding toward the claw. The workpiece positioning device according to claim 1, wherein the workpiece positioning device is formed.