JPH0780557B2 - Parts supply rod - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention is applicable to a projection nut having a welding projection, a pipe with a short wall thickness, or a component such as a bolt with a head. It relates to a supply rod for supplying.

(B) Conventional Technology The conventional technology that is considered to be the closest to the present invention is disclosed in Japanese Patent Publication No. 59-754.
This is the technology disclosed in Japanese Patent Publication No. 9 (R23K11 / 14), and its main points are shown in FIGS. 10 and 11. The inner shaft 2 is slidably assembled in a hollow outer shaft 1, and a magnet (permanent magnet) 4 for adsorbing a component (projection nut) 3 is fixed to the tip of the inner shaft 2. is there. Outer Shaft 1
The outer cylinder 5 accommodating the above is fixed to the stationary member 6 as shown in the drawing, and the pin 8 fixed to the outer shaft 1 is fitted in the guide groove 7 provided in the inner surface of the outer cylinder 5 in the stroke direction. The counterpart sheet metal component 9 is placed on the fixed electrode 10, and the guide pin 11 of the fixed electrode penetrates the hole of the sheet metal component 9 and extends upward.

Both shafts 1 and 2 have their end faces aligned on one plane and flush with each other, and the nut 3 is adsorbed thereto. In this state, when both shafts advance as a unit and reach a certain point, the inner shaft 2 is prohibited from advancing, only the outer shaft 2 advances, and as shown in FIG. 11, the nut 3 is magnetized. 4, the magnetic force on the nut 3 is substantially eliminated. By doing this, Nut 3
Is the guide pin 11 away from the lower end surface of the outer shaft 1.
The guide pin 11 is moved in such a manner that it jumps to the position of, and the guide pin 11 is fitted into the screw hole of the nut 3 to complete the supply.

Although the structure for prohibiting the advance of the inner shaft 2 described above is not shown, the restriction pin fixed to the inner shaft 2 is projected from the long hole formed in the outer shaft,
After both the shafts 1 and 2 have advanced by a certain amount, the restriction pin is locked to the stationary member, whereby the expansion of the inner shaft 2 is forcibly stopped, and only the outer shaft 1 is shown in FIG. Then, the nut attracting force of the magnet 4 is lowered, and the nut 4 is fitted into the guide pin 11 by inertia.

(C) Problems to be Solved by the Invention In the above-described conventional technique, the suction force of the magnet 4 does not sufficiently act on the nut 3 due to the screw hole of the nut 3, and the inner shaft 2 is When the magnet 4 is attached, the size of the magnet is limited. Further, since the nut 3 is in contact only with the end faces of both the shafts 1 and 2, if any external force or vibration occurs, the nut 3 will be displaced and the matching between the screw hole and the guide pin 11 will be lost. A phenomenon occurs in which the nut 3 is repelled by the guide pin 11.

(D) Means for Solving Problems and Their Actions The present invention is provided to solve the above-mentioned problems, and in the case of supplying components by closely contacting them with the end surface of the supply rod, A magnet that gives a trading force to the outer surface of the part is installed in a position that can advance and retreat to the part protruding from the supply rod, and a projection that holds the outside of the part is provided at the tip of the supply rod. The other part has an open portion that is open to face each other and is configured to surround the component, and further, the magnet is installed at a position for pulling the component into the protrusion,
Due to the shape of the protrusion as described above, the component is positively introduced from the supply pipe to a place like a box formed by the protrusion with a magnet, and the attractive force of the magnet applied to the outer surface of the component and the component are By holding the surrounding projections, the parts are almost constrained, the parts are stably positioned at the rod tip and directed toward the target location, and the retracting action of the magnet releases the suction holding force to the parts. And complete the supply to the destination.

(E) Embodiment The embodiment of FIGS. 1 to 5 will be described. This is the case of the spot welding apparatus as shown in FIG. 6, in which the counterpart steel plate component 12 is the fixed electrode 13 The guide pin 14 of the electrode placed on the upper side is in a state of protruding from the steel plate component 12. Reference numeral 15 is a movable electrode installed coaxially with the fixed electrode 13.

Supply unit 16 incorporating the supply rod according to the invention
A supply pipe 18 of a projection nut 17 (which is a case of the projection nut in this embodiment) 17 is connected to the air cylinder 19, and an air cylinder 19 is also connected to the supply pipe 18. A nut 17 is closely attached to the end surface of the supply rod 20 as shown by the two-dot chain line in FIG. 1, and a projection 21 for holding the nut 17 from the outside is provided. The protrusion 21 shown in the drawing has a shape like a U-shaped frame as shown in FIG. That is, an open portion 21d that is open facing the supply pipe 18 is provided, and the other portion is a portion 21b provided on the left and right of the deepest portion 21a when viewed from the open portion 21d in a form of surrounding the component, 2c from 21c
1 is configured. The supply rod 20 is suitably made of stainless steel.

The magnet 22 that applies suction force to the outer surface of the nut 17 is located at a position projecting from the end surface of the supply rod 20, and
It is possible to move forward and backward with respect to 20. In this embodiment, the supply rod 20 has a double structure of the inner and outer sides for advancing and retracting the magnet 22, and the supply rod 20 itself is a hollow shaft 23, and the inner shaft 24 is slidably inserted therein. I am doing it. The magnet 22 is coupled to a sliding body 25 that is in contact with the outer surface of the hollow shaft 23, and the inner shaft 24 and the sliding body 25 are integrated via a bolt 26. An elongated hole 27 is formed in the hollow shaft 23 in the stroke direction, and the bolt 26 penetrates the elongated hole. By arranging the magnet 22 as described above, an attractive magnetic force acts such that the magnet 22 pulls the nut 17 into the protrusion 21.

The lower end surface of the inner shaft 24 can be in close contact with the nut 17 so as to form the same plane as the lower end surface of the hollow shaft 23, and there is a small magnet (permanent magnet) for giving the nut 17 a light upward pulling force. 28 embedded.

The supply rod 20 is accommodated in the outer cylinder 29 with a gap as shown in the drawing, and the air cylinder 19 is coupled to the upper side of the outer cylinder 29.
A supply pipe 18 is welded to the lower side. The piston rod 30 of the air cylinder 19 is connected to the supply rod 20. A restriction pin 31 is fixed to the inner shaft 24, which penetrates a long hole 32 opened in the stroke direction of the hollow shaft 23 to supply the feed rod 20.
Protruding from. The coil spring 33 inserted in the hollow shaft 23 exerts its tension on the inner shaft 24, and the tension is regulated by the regulation pin 31 hitting the lower end of the elongated hole 32.

A drive unit 34 is attached to the outer portion of the outer cylinder 29 for retracting the magnet 22 after the supply rod 20 has advanced by a predetermined amount and stopped, or almost at the same time as the stop. Although an electromagnetic solenoid or the like may be used as this drive device, an air cylinder 35 is used here, and a locking piece 37 fixed to the piston rod 36 has a long hole 38 formed in the outer cylinder 29 in the stroke direction. Project into the outer tube 29 through the
They are facing each other so that they can collide with 31.

As apparent from FIG. 2, the supply rod 20 (hollow shaft 23)
Since the flat surfaces 39 and 40 are formed on both sides, the cross section has an oval cross-section, and the detent is tightly fitted into the through hole 42 formed in the upper plate 41 of the supply pipe 18 to prevent detent. Has been done. The upper plate 41 is provided with a notch 43 that receives the sliding body 25.

The supply pipe 18 has a rectangular cross section, and by providing a cutout portion 44 as shown in FIG. 1 at its end portion, bifurcated protrusions 45 and 46 are provided, and the pivot shafts 47 and 48 fixed thereto are opened and closed. Boards 49 and 50 are pivotally attached. In short, one of the wings of the hinge is the opening / closing plate 49,50.
The other wing piece or fixing plate 51, 52 is fixed to the projecting piece 45, 46 with bolts 53, 54. The spiral spring 55 (only the side of the pivot shaft 47 is shown in FIG. 5) assembled to the pivot shafts 47 and 48 gives the opening and closing plates 49 and 50 elastic force in the closing direction to maintain the state as shown in FIG. is doing. The two-dot chain line in FIG. 5 shows the state where the opening / closing plate 49 is pushed open. The open portion 21d of the protrusion 21 is arranged so as to face the above-mentioned cutout portion 44.

Explaining the operation of the embodiment described above, when the nut pushed by compressed air or the like moves in the supply pipe 18 and reaches the vicinity of the end of the supply pipe 18, the nut 17 is magnetized.
Suctioned at 22 and introduced into the protrusion 21,
It is as shown by the two-dot chain line in the figure. Next, when the supply rod 20 moves forward, the nuts 17 push the open / close plates 49, 50 open, and the nut 17 advances with the magnet 22 attracted and held, and comes close to the guide pin 14 of the fixed electrode. Stop. After that, when the air cylinder 35 operates and the locking piece 37 is pulled up, the displacement is transmitted to the sliding body 25 via the regulation pin 31, the inner shaft 24, and the bolt 26, and the magnet 22 (and the other magnet 28 at the same time). Goes away from Natto 17, so
The attractive magnetic force on the nut 17 is substantially eliminated, the screw hole of the nut receives the penetration of the guide pin 14, and the nut supply is completed.

The embodiment shown in FIG. 7 is for the case where the above-mentioned drive device is stopped, and is a type in which the relative retraction of the magnet 22 is obtained by the restriction pin 31 engaging with the stop member. As the stationary member, the protruding piece 56 that protrudes inside the outer cylinder 29 is an example that can be most easily realized. In the case of such a type, the supply rod 20 advances even after the magnet 22 has stopped, and the suction magnetic force to the nut is substantially eliminated after the nut 17 is separated from the magnet 22 to some extent.
At the same time when the nut 20 stops, the nut escapes from the protrusion 21 by the inertial force and is supplied to the guide pin 14. In this embodiment, the magnet 28 as described above is stopped and the lower end of the inner shaft 24 is not exposed on the lower surface of the supply rod 20.

In the embodiment shown in FIG. 8, the projection at the end of the supply rod is modified. In the previous embodiment, the projection 21 is U-shaped, but here the two projections are in the opposite state on the outside of the nut. part
57, 58 and the magnet 22 form a U-shaped protrusion
It is said to be 67. The magnet 22 is the part 57,
The inner part of 58 is closed, while the code 21d
The open part shown by is provided. Therefore, the magnet 22
Comes into direct contact with the nut 17.

The embodiment shown in FIG. 9 is an operating rod along the outside of the supply rod 20.
The magnet 22 moves the magnet 22 forward and backward, and an operating rod 59 is provided between the guide cylinders 60 and 61 in order to smooth the slidability with the supply rod 20. A groove formed in the stroke direction of the supply rod 20 by interposing a coil spring 64 between the flange 62 of the guide cylinder 60 and the flange 63 of the supply rod.
The tension of the coil spring 64 is received by inserting the pin 66 fixed to the guide cylinder 60 into the inside of 65. When the entire supply rod 20 is integrally advanced and advanced, the flange 62 is stopped by the projecting piece 56, and the same supply as in FIG. 7 is achieved.

(F) Effect According to the present invention, the projection has an open portion that is open facing the supply pipe of the component, and the other portion surrounds the component, and the magnet projects the component. Since it is installed in a position projecting from the supply rod so that it can be pulled inward, it can smoothly move into the protrusion while being attracted by the magnet, and stops adsorbing while being surrounded by the protrusion. Therefore, the position of the end surface of the supply rod is not displaced, and the parts can be held accurately. Since the magnet is a magnet protruding from the outside of the supply rod, its size can be set as large as necessary, and the attracting magnetic force will not be insufficient. Further, since the projection for holding the component fulfills the holding function, the magnet can be made smaller by that much. As described above, since the outside of the component is held by being surrounded by the protrusions, even if some external force or vibration acts on the component, the suction position of the component may shift or may accidentally fall off. There is no such thing.

[Brief description of drawings]

1 to 9 show an embodiment, and FIG. 1 is a vertical side view,
FIG. 2 is a sectional view taken along line (2)-(2) of FIG. 1, FIG. 3 is a three-dimensional view, FIG. 4 is a vertical sectional front view, FIG. 5 is a side view of the opening / closing plate, and FIG. The side view shown, FIG. 7 is a vertical side view, FIG. 8 is a three-dimensional view, and FIG. 9 is a side view. Figure 10 and
FIG. 11 is a conventional example, and is a vertical side view. 20 …… Supply rod, 17 …… Parts, 22 …… Magnet, 2
1,67 …… Protrusion.

Claims (1)

[Claims] 1. A supply rod in which a component is closely attached to an end face of a supply rod, and a magnet which gives an attractive force to an outer surface of the component is installed in a position projecting from the supply rod so as to be able to move forward and backward, and a tip of the supply rod. Is provided with a protrusion that holds the outside of the component, and the protrusion has an opening that is open facing the supply pipe of the component, and the other portion is configured to surround the component. The magnet is installed at a position where the magnet is pulled into the protrusion, and the magnet is a component supply rod.