JPH09174355A - Supply head of part supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply an annular part so as to be rightly fitted to a large diameter part of a guide pin having a step difference. SOLUTION: In this supply head of a part supply device, a part supply chute 2 is installed on a main body block 1, and a cover cylinder 3 is fixed to the tail end of the main body block 1, and a supply rod 4 is arranged inside the cover cylinder so as to be movable in the shaft direction as well as to be insertable into the main body block. A part supply part 5 to supply an annular part is fixed to the tip of the supply rod 4, and an electromagnetic coil 6 is arranged in the main body block so that magnetic force is applied to the part support part. An inserting part 5a having a flange part which has an outside diameter slightly smaller than an inside diameter of the annular part and can be inserted into the annular part, is arranged in the part support part 5, and a guide part 5c having a curved surface smoothly lowering toward the tip is formed on a front upper surface of the inserting part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supply head of a component supply device for supplying an annular component such as a washer to a lower electrode of a welding machine.

[0002]

2. Description of the Related Art Conventionally, as a device for supplying parts such as nuts to a lower electrode of a welding machine, a magnetic rod is disposed diagonally above a lower electrode located below so that a magnetic rod can be driven forward and backward toward the lower electrode. However, there is known an automatic nut feeder in which an electromagnetic coil for magnetizing a magnetic rod is provided and a chute for feeding a component is provided at the tip position of the magnetic rod in the retracted position of the magnetic body. 53-36365
Reference).

[0003]

This component supply device is
When a part such as a nut is magnetically attracted to the tip of the magnetic rod and the magnetic rod is advanced to reach the part just above the guide pin of the lower electrode, the electromagnetic coil is turned off and the part becomes inertial. It works by dropping and fitting an annular component such as a nut on the guide pin. In this case, since the guide pin of the lower electrode has a simple rounded columnar shape, an annular component such as a nut can be relatively easily fitted to the guide pin due to inertial drop when magnetic attraction disappears. .

However, for example, as shown in FIG. 6, when a ring-shaped component such as a washer having a hole having a diameter larger than the hole is concentrically arranged and welded to a plate-like work having the hole,
First, the annular component is fitted to the large diameter portion of the stepped guide pin, and then the plate-shaped work is fitted to the small diameter portion of the guide pin and welded. In such a case, when fitting the annular part to the large-diameter part of the stepped guide pin, the conventional supplying head supplies the annular part onto the guide pin, stops magnetic attraction, and then fits it by inertial drop. In such a case, the annular component is often caught on the upper portion of the step portion, that is, the small diameter portion, and there is a problem that it is difficult to correctly fit the annular component to the large diameter portion of the guide pin.

The present invention has been made in view of the above points, and provides a supply head of a component supply device capable of supplying an annular component so as to be fitted properly to a large diameter portion of a stepped guide pin. With the goal.

[0006]

In order to achieve the above-mentioned object, the supply head of the present invention has a chute for supplying parts attached to a main body block, fixes a cover cylinder to the end of the main body block, and A supply rod is arranged inside the cylinder so that it can move in the axial direction and can be inserted through the main body block, and a component support portion that supports an annular component is fixed to the tip of the supply rod, and an electromagnetic coil is a component inside the main body block. In a supply head of a component supply device for supplying an annular component to a lower electrode, which is disposed so as to give a magnetic force to a support portion and has a guide pin having a small diameter portion and a large diameter portion protruding in the center, a component supporting portion Is provided with an insert portion with an outer diameter that is slightly smaller than the inner diameter of the annular part and that can be inserted into the annular part, and has a curved surface that smoothly descends toward the tip on the front upper surface of the insert part. A guide part is formed, and a recess for accommodating the small diameter part of the guide pin is formed at the center of the tip side of the guide part.When the component support part reaches the lower electrode, the end part of the large diameter part of the guide pin is formed. The guide portion is formed so that the tip of the guide portion is located directly above.

[0007]

[Operation / Effect] In the supply head having such a structure, when the supply rod starts the push-out operation while the annular part is fed into the chute and stopped at the fixed position, the electromagnetic coil is energized, and the part support part A magnetic force is generated in the part, and the part support portion at the tip of the supply rod enters the annular part.

At this time, the annular part is fitted in the insertion part in front of the flange part and is magnetically attracted thereto, and the annular part on the part supporting part advances toward the lower electrode obliquely downward as the supply rod is pushed out. .

Then, when the component support reaches directly above the guide pin of the lower electrode, the advance of the supply rod is stopped and the energization of the electromagnetic coil is stopped. At this time, the component support portion is lowered to a position where the small diameter portion of the guide pin is inserted into the recess, and the bottom surface of the component support portion is located at a fixed position just above the upper surface of the large diameter portion of the guide pin.

At this time, when the magnetic attraction is released, the annular component supported by the insertion portion falls while being guided by the curved surface of the upper surface of the guide portion due to inertial force and gravity, and the large diameter portion of the guide pin. The guide part is formed so that the tip of the guide part is located directly above the end of the guide part, and the tip part of the guide part is located so as to cover the large diameter part of the guide pin. Accurately fitted into the large diameter part.

As described above, even when the annular component is supplied so as to be fitted into the stepped guide pin having the small diameter portion and the large diameter portion, the guide portion of the component support portion at the tip of the supply rod is
In order to guide the parts right above the large diameter part of the guide pin,
The annular component is not caught on the small diameter portion, and the annular component can be reliably and stably fitted into the large diameter portion and placed on the lower electrode.

[0012]

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

FIG. 1 shows a sectional view of a supply head of a component supply device for supplying an annular component B such as a washer to a lower electrode 20 of a welding machine. In this supply head, basically, a chute 2 for supplying components is attached to the tip of the main body block 1, a cover cylinder 3 is fixed to the end of the main body block 1, and a supply rod 4 is fitted and inserted therein. A component support 5 is fixed to the tip of the supply rod 4. The supply rod 4 is connected to the tip of an operating rod of an actuator such as a fluid pressure cylinder (not shown) and moves forward and backward in the axial direction.

The main body block 1 is formed of a non-magnetic material into a substantially cylindrical shape, and an annular electromagnetic coil 6 is disposed inside the main body block 1, and a magnetic material supply rod 4 is inserted into the electromagnetic coil 6. The supply rod 4 is supported by a bearing portion provided in the main body block 1 so as to be slidable in the axial direction, but a flat portion is formed on a part of the outer peripheral portion of the rod 4 to have an irregular cross section.
The rotation of the supply rod 4 is prevented by making the hole of the bearing portion correspond to the cross section.

The component support 5 fixed to the tip of the supply rod 4 is formed of a magnetic material so as to fit inside the annular component B and magnetically attract and support it. That is, as shown in FIGS. 3 to 5, the component support portion 5 has an outer diameter slightly smaller than the inner diameter of the annular component B, and has an insert portion 5a having a circular cross section that can be inserted therein at a substantially central portion. The insertion part 5a
After that, a flange portion 5b having an outer diameter larger than the inner diameter of the annular component B is formed, and the annular component B is fitted and supported by the insertion portion 5a in front of the flange portion 5b when the supply rod 4 is advanced.

Further, at the tip of the insertion portion 5a, the insertion portion 5a
The annular component B supported by the lower electrode 2
A guide portion 5c for feeding to 0 is formed on the upper surface. The guide portion 5c has a curved surface that smoothly descends toward the tip thereof, and has a tip portion that is bifurcated as shown in FIG. That is, the concave portion 5d is formed in the center of the tip side of the guide portion 5c.
Is formed, and when it reaches directly above the lower electrode 20 when the component support portion 5 is advanced, the tip of the guide pin 22 of the lower electrode 20 enters this recess 5d, and the tip portion of the component support portion 5 and its guide pin 22 are formed. It is formed so as to avoid contact with the tip.

Further, as shown in FIG. 6, the tip shape of the guide portion 5c is such that the component support portion 5 advances to the advance end and the lower electrode 2
When it reaches 0, the large diameter portion 22b of the guide pin 22
Is formed so as to be located right above the end position of the. Furthermore, the bottom surface 5e of the guide portion 5c (the inclined surface at the lower end of the tip of the component support portion 5) is positioned substantially horizontally on the upper surface of the large diameter portion 22b of the guide pin 22 when reaching the lower electrode 20. It is formed into a cut shape.

On the other hand, a feed hose 7 for parts is connected to the upper part of the chute 2, and a plate 8 is provided to the lower part of the chute 2.
Is fixed, and the annular part B is fed through the feeding hose 7.
Enters the chute 2 and hits the plate 8 and stops in place. A door 9 is attached to the front surface of the chute 2 via a hinge part 10 so as to be openable and closable, and an annular part B in the chute 2 is provided.
Is stopped and held between the door 9 and the door 9. The door 9 is formed with an opening through which the guide portion 5c of the component support portion 5 can enter.

An opening having the same cross section as that in the main body block 1 is formed in the chute 2, and the component supporting portion 5 is formed from the opening.
Can move forward so that Hinge part 10 of door 9
A spring 11 that biases the door 9 in the closing direction is provided on the door, and the door 9 is biased in the closing direction. When the supply rod 4 and the component support portion 5 move forward, the door 9 is pushed forward by the annular component B or the like and opened forward.

Next, the operation of the supply head of the component supply apparatus having the above structure will be described. The supply head is disposed so as to be inclined downward so that its front portion faces the lower electrode 20 for welding an annular component such as a washer. Lower electrode 2
0 is formed in a cylindrical shape, and the small diameter portion 22
A guide pin 22 having a stepped shape including a and a large diameter portion 22b is provided so as to project.

When the annular component B is fed into the chute 2 through the feed hose 7 and stopped by hitting the plate 8, when an actuator (not shown) starts the pushing operation of the feed rod 4, the electromagnetic coil 6 is energized. Then, the rod 4 and the component support portion 5 are excited, and the component support portion 5 at the tip of the rod 4 enters the annular component B.

At this time, the inside of the annular part B is fitted into the insertion part 5a in front of the flange part 5b and magnetically adsorbed there, and the door 9 is pushed open as it is, and the supply rod 4, the part support part 5, and the annular part. The part B advances toward the lower electrode 20 diagonally below.

Then, as shown in FIG. 6, the supply rod 4
When the component support portion 5 at the tip reaches just above the guide pin 22 of the lower electrode 20, the supply rod 4 is stopped, and the energization of the electromagnetic coil 6 is stopped. At this time, the component support portion 5 is lowered to a position where the small diameter portion 22a of the guide pin 22 is inserted into the recess 5d, and the bottom surface 5e of the component support portion 5 is formed so as to cover the large diameter portion 22b of the guide pin 22. Located on top.

At this time, since the magnetic attraction is released, the annular component B supported by the insertion portion 5a falls while being guided by the upper surface (the front downward curved surface) of the guide portion 5c by inertial force and gravity. To do. The guide portion 5c is formed so that the tip of the guide portion 5c is located directly above the end portion of the large diameter portion 22b of the guide pin 22.
Since the tip of c is positioned so as to cover the large diameter portion 22b of the guide pin 22, the annular component B is satisfactorily guided by the guide portion 5c, and is accurately fitted into the large diameter portion 22b.

After that, the supply rod 4 and the component supporting portion 5 are moved to the main body block 1 by pulling back the actuator.
When returned to the inside, a plate-like work W having a hole having a diameter smaller than the inner diameter of the annular component B is provided in the small diameter portion 22a of the guide pin 22 of the lower electrode 20 by a means (not shown). It is arranged on the annular component B so as to fit into the small diameter portion 22a.

Then, as shown in FIG. 7, the upper electrode 21 having a hole in the lower surface is pressed against the plate-like work W from above, and a current flows between the upper electrode 21 and the lower electrode 20. Then, the plate-shaped work W and the annular component B are welded.

On the other hand, when the component support 5 returns to the main body block 1, the door 9 is closed by the spring 11, and the next annular component B is sent into the shooter 2 and stopped at a fixed position. The same operation is repeated, and the annular component B is sent onto the lower electrode 20.

Even when the annular component B is supplied so that it is fitted into the stepped guide pin 22 having the small diameter portion 22a and the large diameter portion 22b, the guide portion 5c of the component support portion 5 at the tip of the supply rod 4 is provided. , The large diameter portion 22 of the guide pin 22
Since the component B is guided right above the b, the annular component B is not caught in the small diameter portion 22a, and the annular component B is reliably and stably fitted to the large diameter portion 22b and properly placed on the lower electrode 20. be able to.

[Brief description of the drawings]

FIG. 1 is a sectional view of a supply head showing an embodiment of the present invention.

FIG. 2 is a front view of the supply head.

FIG. 3 is a plan view of a component support portion 5.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a front view of a component support portion 5.

FIG. 6 is a side view when supplying the annular component B onto the lower electrode.

FIG. 7 is a cross-sectional view when the lower electrode and the upper electrode are welded together.

[Explanation of symbols]

 1-Body Block 2-Chute 3-Cover Tube 4-Supply Rod 5-Component Support 5a-Insert 5a-Flange 5c-Guide 5d-Concave 5e-Bottom 6-Electromagnetic Coil

Claims (2)

[Claims] 1. A chute for supplying parts is attached to a main body block, a cover cylinder is fixed to an end of the main body block, and a supply rod is axially movable inside the cover cylinder and inside the main body block. It is arranged so that
A component support portion for supporting an annular component is fixed to the tip of the supply rod of the supply rod, and an electromagnetic coil is arranged in the main body block so as to give a magnetic force to the component support portion, and a small diameter portion and a large diameter portion are provided. In a supply head of a component supply device for supplying an annular component to a lower electrode provided with a guide pin protruding in the center, the component support portion has an outer diameter slightly smaller than the inner diameter of the annular component. An insert portion with a flange portion that can be inserted into the component is provided, a guide portion having a curved surface that smoothly descends toward the tip is formed on the front upper surface of the insert portion, and the guide pin is provided at the center of the tip end side of the guide portion. Is formed so as to accommodate the small diameter portion of the guide pin, and when the component support portion reaches the lower electrode, the tip of the guide portion is positioned directly above the end portion of the large diameter portion of the guide pin. The guide portion is formed A supply head of a component supply device characterized by the above. 2. The component supply according to claim 1, wherein the guide portion of the component support portion has a bottom surface which is located substantially horizontally on the upper surface of the large diameter portion of the guide pin when reaching the lower electrode. Supply head of equipment.