JPH06170674A - Workpiece positioning pin - Google Patents

Abstract

PURPOSE:To manufacture a workpiece with space saved further with low cost by corresponding to also the workpiece without a reference hole while a plurality of the workpieces having the reference hole of different diameter can be positioned by a positioning pin of simple mechanism. CONSTITUTION:In a workpiece positioning pin protruded from a workpiece mounting surface 14 to provide a tapered surface 20a in a protruding end 20t for performing positioning of a workpiece by fitting into a positioning reference hole 2A of a rear floor panel 1A serving as the workpiece, the pin 20 is displaceably supported in a fitting direction relating to the rear floor panel 1A. The pin 20 is energized by a coil spring 30 in a direction of protruding from the workpiece mounting surface, so as to protrude the pin 20 from the workpiece mounting surface 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work positioning pin capable of positioning a plurality of works each having a reference hole having a different diameter and capable of handling a work having no reference hole.

[0002]

2. Description of the Related Art One example of conventional positioning pins is
This will be described with reference to FIGS. 5 and 6. 5 or 6, reference numeral 1 denotes a rear floor panel as a work,
Reference numeral 2 indicates a reference hole for positioning which is opened in the rear floor panel 1, and reference numeral 3 indicates a location pin.
The location pin 3 has a tapered taper surface 3a at its protruding end and a cylindrical positioning portion 3b at the other end. The location pin 3 has a positioning portion 3b.
Has an outer diameter slightly smaller than the diameter of the reference hole 2, and is normally fixed on a receiving jig base 5 having a work mounting surface 4 for receiving the surface of the rear floor panel 1. When positioning the rear floor panel 1 in a predetermined process, the rear floor panel 1 is transferred onto the jig base 5 by a transfer device (not shown), the location pin 3 is fitted into the reference hole 2 of the rear floor panel 1, and the positioning portion 3b is positioned. Positioning was performed by abutting on the edge of the reference hole 2.

Further, when a plurality of rear floor panels having reference holes with different diameters at the same position are to be positioned by the same jig, a location pin having an outer diameter corresponding to each reference hole is used as a switching device using an air cylinder or the like. Therefore, the positioning is performed by switching each reference hole.

Further, in the case of positioning a rear floor panel having no reference hole at the same position, in order to avoid contact between the location pin at that position and the surface of the rear floor panel, the location pin is retracted by a switching device. It corresponded.

[0005]

However, since the location pin 3 is fixed to the receiving jig base 5, it can be applied only to the positioning of the rear floor panel having the same reference hole, and the diameter is different at the same position. There is a problem in that it cannot be applied to a plurality of rear floor panels having reference holes or a rear floor panel having no reference holes. Further, when the positioning is performed by the switching device, it is necessary to secure the space and to modify the switching device and the electrical equipment for switching, which causes a problem that the cost becomes extremely high.

Therefore, according to the present invention, in order to solve such a problem, a plurality of works having reference holes with different diameters can be positioned by a positioning pin of a simple mechanism, and also a work without a reference hole can be handled. It is an object of the present invention to provide a work positioning pin which can be manufactured at a low cost and in a small space.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and the invention according to claim 1 is a reference hole for positioning a work, projecting from the work mounting surface. A work positioning pin having a taper surface at a protruding end for positioning a work by inserting the work piece, the pin being displaceably supported in a fitting direction with respect to the work piece, and the pin being projected from the work placement surface. The pin is projected from the work mounting surface by being urged by elastic means.

According to a second aspect of the invention, in the work positioning pin according to the first aspect, there is provided a first reference hole having a first reference hole.
Or the second work having a reference hole having a diameter smaller than that of the first reference hole, when the first work is positioned, the other end side taper surface is aligned with the first reference hole edge. The taper side taper surface abuts the edge of the second reference hole when abutting and positioning the second work.

According to a third aspect of the present invention, in the work positioning pin according to the first or second aspect, a stopper is provided at the other end of the pin, and the protrusion amount of the pin from the work mounting surface is regulated by the stopper. It has been configured.

According to a fourth aspect of the present invention, in the work positioning pin according to the first aspect, when the reference hole is not provided,
The projecting end is in contact with the work surface and is recessed to the same plane as the mounting surface.

The invention according to claim 5 is the invention as defined in claims 1, 2, and 3.
Alternatively, in the work positioning pin described in 4, the top of the protruding end has a flat surface.

[0012]

According to the first aspect of the present invention, with the above-described structure, the work positioning pin biased by the elastic means and protruding from the work mounting surface is fitted into the reference holes having different diameters into which the work positioning pin can be fitted. Then, it is freely displaced in the fitting direction with respect to the work, or is freely displaced in the fitting direction with respect to the work even when the work has no reference hole.

According to the second aspect of the invention, in the work positioning pin according to the first aspect, the first work having the first reference hole or the reference hole having a diameter smaller than that of the first reference hole is provided. Of the second workpieces, when positioning the first workpiece, the other end side tapered surface abuts the first reference hole edge, and when positioning the second workpiece, the tapered side tapered surface becomes the second reference hole. It comes into contact with the hole edge and is freely displaced in the direction of fitting into the work.

According to a third aspect of the invention, in the work positioning pin according to the first or second aspect, a stopper is provided at the other end of the pin, and the amount of protrusion of the pin from the work mounting surface is regulated by the stopper. As a result, in addition to the above-described action, the amount of protrusion of the work positioning pin from the work mounting surface is restricted.

According to the invention described in claim 4, in the work positioning pin according to claim 1, when there is no reference hole, the projecting end of the work positioning pin abuts the work surface and is flush with the mounting surface. Immerse yourself.

According to the fifth aspect of the invention, in the work positioning pin according to the fourth aspect, the work contact surface is not distorted because the pin contacting surface has a flat surface at the top.

[0017]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Constituent elements having the same configurations and functions as those of the prior art are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 shows the construction of a work positioning pin showing an embodiment of the present invention. In the figure, reference numeral 1
0 indicates a work positioning pin. Work positioning pin 1
Reference numeral 0 denotes a rear floor panel 1 as a work, which projects from a panel mounting table 15 having a work mounting surface 14 on its upper surface.
A pin 20 having a tapered taper surface 20a at a projecting end 20t for positioning the rear floor panel 1A by being fitted into the reference hole 2A for positioning A, and the pin 20 is displaceably supported in a fitting direction with respect to the reference hole 2A. At the same time, it is mainly configured by a coil spring 30 as an elastic means for urging the pin 20 in a direction in which it projects from the work mounting surface 14.

The panel mounting table 15 has a flanged cylindrical shape having a flange 15a including the work mounting surface 14 on its upper portion,
Made of metal. A guide hole 15h for guiding the pin 20 in the fitting direction with respect to the reference hole 2A is formed in the inner cylinder portion of the panel mounting table 15. A stepped ring-shaped mounting base support member 16 made of metal is arranged in the outer cylinder of the panel mounting base 15 with a slight gap therebetween. Mounting table support member 16
Is fastened and fixed by a screw (not shown) at a step portion 16a that overlaps the flange 15a. A cylindrical spring support 17 made of a metal having a flange 17 a and having a flange 17 a is disposed below the mounting table support member 16. Spring support 17
Are fastened and fixed by screws (not shown) at the bottom of the mounting table support member 16. At the bottom of the spring support 17,
A cylindrical metal jig base 18 having an insertion hole 18h is arranged, and the bottom of the spring support 17 and the top of the jig base 18 are fastened and fixed by screws (not shown).

As shown in FIG. 2, the tapered surface 2 of the pin 20 is
The maximum diameter of 0a is formed to be at least larger than the diameter of the rear floor panel 1B having the maximum diameter reference hole 2B in the rear floor panel group as the work.

As shown in FIGS. 1 and 2, below the tapered surface 20a of the pin 20, a cylindrical sliding portion 20b and a flange-shaped stopper 20c having a diameter larger than that of the guide hole 15h.
And are formed respectively. A rod-shaped slide member 19 is integrally formed below the stopper 20c so as to move up and down integrally in the insertion hole 18h. As is well known, the tapered surface 20a and the sliding portion 20b of the pin 20 are made of a special steel material subjected to a predetermined heat treatment.

Stopper 20c of pin 20 and spring support 1
A coil spring 30 as an elastic means is provided between the lower part 17d of the inner cylinder 17 and the protruding end 20t of the pin 20.
Is always biased in a direction projecting from the work placement surface 14. Therefore, the tapered surface 20 a of the pin 20 is projected from the work mounting surface 14 by the coil spring 30, and the stopper 20 c is provided on the bottom surface 15 of the panel mounting table 15.
By abutting on b, the amount of protrusion from the work placement surface 14 is regulated.

Next, the operation of the work positioning pin will be described. As shown in FIG. 1, a transport device (not shown)
When the rear floor panel 1A is conveyed and set on the panel mounting table 15 by the, the taper surface 20a of the pin 20 is set.
Is fitted into the reference hole 2A, and the rear floor panel 1A is positioned by contacting the tapered surface 20x at a portion where the diameter of the reference hole 2A and the outer diameter of the tapered surface 20a are the same with the edge of the reference hole 2A. . At the same time, the rear floor panel 1A lowers the pin 20 in the direction of the arrow against the urging force of the coil spring 30 due to its own weight and the pressing force of a clamp (not shown), and the lower surface of the rear floor panel 1A is attached to the panel mounting table 15. The workpiece mounting surface 14 is received and positioned.

The operation of the work positioning pin 10 shown in FIG. 2 differs from the operation shown in FIG. 1 only in that the movement amount for lowering the pin 20 in the direction of the arrow is extremely small.

In the example shown in FIG. 3, the work positioning pin 10 is used.
Another use of is shown. The operation is such that the protruding end 20t of the pin 20 comes into contact with the lower surface of the rear floor panel 1C, which is different only in that there is no reference hole, is displaced in the direction of the arrow, and is recessed to the same surface as the work mounting surface 14, and is not shown. The rear floor panel 1C is positioned by the positioning pin and the clamper.

The example shown in FIG. 4 illustrates another application according to another embodiment. The work positioning pin 10A differs from the pin 20 shown in FIGS. 1 to 3 only in that a flat surface 20p is formed on the top of the projecting end of the pin 20A. Further, the use of the work positioning pin 10A is as shown in FIG.
The difference from the application of the work positioning pin 10 shown in FIG. 2 is that the reference hole 2D of the rear floor panel 1D is set off the center of the tapered surface 20e of the pin 20A and offset.

Next, the operation of FIG. 4 will be described. The rear floor panel 1D is mounted on the flat surface 20p of the pin 20A on the panel mounting table 15 with the set position displaced. At this time, the rear floor panel 1D around the reference hole 2D
Is lowered by the weight of the rear floor panel 1D and the pressing force of a clamp (not shown) against the biasing force of the coil spring 30 to lower the pin 20A in the same manner as in FIGS. It is received by the work mounting surface 14 of the panel mounting table 15. After this, a defective setting of the rear floor panel 1D is detected by a detection device (not shown), and the line is stopped.

The spring load of the coil spring 30 is determined by the edges of the reference holes 2A and 2B of the rear floor panel group, or the rear floor panels 1C and 1D and the tapered surface 20 of the pin 20 or 20A.
a or the projecting ends 20t and 20p are smaller than the weight of each rear floor panel and the load pressed by the pressing force of a clamp (not shown), and the weight of the pin 20 or 20A and the guide hole 15h of the panel mounting table supporting member are slidable. It is set to an appropriate range that is larger than the total frictional force with the moving portion 20b. The use of oilless metal or the like can be recommended to reduce the frictional force between the guide hole 15h and the sliding portion 20b, but what kind of material or means to select is only a matter of design.

Instead of the stopper 20c of this embodiment, the height of the coil spring 30 at the time of mounting may regulate the amount of protrusion of the pins 20 and 20A from the work mounting surface 14.

The elastic means is not limited to the coil spring 30 and may be elastic rubber which is less likely to be permanently deformed.

In short, the work locating pin of the present invention is a work locating pin which has a tapered taper surface at the projecting end which projects from the work mounting surface and fits into the reference hole for positioning the work. It suffices that the pin is supported so as to be displaceable in the fitting direction with respect to the work, and the pin is projected from the work placement surface by being biased by the elastic means in the direction in which the pin is projected from the work placement surface.

[0033]

As described above, according to the present invention, the work positioning pins, which are biased by the elastic means and project from the work mounting surface, have different diameters into which the work positioning pins can be fitted. Positioning multiple workpieces with different diameter reference holes by positioning pins of a simple mechanism by inserting the workpieces in the reference holes or by freely displacing the workpieces in the inserting direction even if there is no work reference hole at the same position. In addition, it can be manufactured at a low cost and space without using a switching device using an air cylinder or the like.

According to the second aspect of the invention, in the work positioning pin according to the first aspect, the first work having the first reference hole or the reference hole having a diameter smaller than that of the first reference hole is provided. Of the second workpieces, when positioning the first workpiece, the other end side tapered surface abuts the first reference hole edge, and when positioning the second workpiece, the tapered side tapered surface becomes the second reference hole. By abutting against the hole edge and freely displacing in the fitting direction with respect to the work, it is possible to position a plurality of works having reference holes with different diameters with a positioning pin of a simple mechanism, and to switch using an air cylinder or the like. It can be manufactured at a low cost and in a small space without using a device.

According to the invention described in claim 3, in the work positioning pin according to claim 1 or 2, a stopper is provided at the other end of the pin, and the projection amount of the pin from the work mounting surface is regulated by the stopper. By virtue of this, in addition to the above-mentioned action, the projection amount of the work positioning pin from the work mounting surface is regulated, so that it is possible to position a plurality of works having reference holes with different diameters by a positioning pin of a simple mechanism. In addition, it can be manufactured at a low space and at low cost without using a switching device using an air cylinder or the like.

According to the invention described in claim 4, in the work positioning pin according to claim 1, when there is no reference hole, the projecting end of the work positioning pin abuts the work surface and is flush with the mounting surface. Since it is recessed, it is possible to provide a work positioning pin that can handle a work without a reference hole, can be manufactured in a small space, and at low cost.

According to the invention of claim 5, claim 1,
In the work positioning pins described in 2, 3, or 4, since the work contact surface is not distorted by having the flat surface on the top of the projecting end, there is no need to correct the work distortion or discard the work.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a work positioning pin showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing an operation when the work positioning pin of FIG. 1 positions a rear floor panel having a reference hole with a maximum diameter.

FIG. 3 is a vertical cross-sectional view showing an operation when the work positioning pin of FIG. 1 corresponds to a rear floor panel having no reference hole.

FIG. 4 is a vertical cross-sectional view showing an operation when the work positioning pin of FIG. 1 corresponds to a rear floor panel in which a core of a reference hole is displaced.

FIG. 5 is a perspective view showing an external shape of a conventional positioning pin.

FIG. 6 is a vertical sectional view showing the operation of FIG.

[Explanation of symbols]

1A, 1B, 1C, 1D Rear floor panel as a work 2A, 2B, 2C, 2D Positioning reference hole 10, 10A Work positioning pin 10a Tapered surface 10p Flat surface formed on the protruding end of the pin 10t Formed on the pin Projecting end 14 Work placement surface 15 Work placement table 20, 20A pin 20c Stopper 30 Coil spring as elastic means

Claims (5)

[Claims] 1. A work positioning pin having a tapered taper surface on a projecting end for positioning a work by projecting from the work mounting surface and fitting the work into a reference hole for positioning the work. A work positioning pin, wherein the work positioning pin is movably supported on the work mounting surface and is biased by elastic means in a direction to project the pin from the work mounting surface so that the pin projects from the work mounting surface. 2. The work positioning pin according to claim 1, wherein the first work having a first reference hole or the second work having a reference hole having a diameter smaller than that of the first reference hole, When positioning the first work, the other end side tapered surface abuts on the first reference hole edge, and when positioning the second work, the tapered side tapered surface causes the second reference hole edge. Work positioning pin characterized by abutting against. 3. The work positioning pin according to claim 1 or 2, wherein a stopper is provided at the other end of the pin, and the protrusion amount of the pin from the work mounting surface is regulated by the stopper. Work positioning pin. 4. The work positioning pin according to claim 1, wherein when the reference hole is not present, the projecting end abuts on the work surface and is recessed to the same plane as the mounting surface. Positioning pin. 5. The work positioning pin according to claim 1, 2, 3 or 4, wherein a flat surface is provided on the top of the protruding end.