JPH0431794B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention is applicable to parts such as projection nuts with welding protrusions, short thick-walled pipes, or bolts with heads. This relates to a feeding device that effectively utilizes forward and backward movement in an inclined state.

(b) Prior art The prior art that is considered to be closest to the present invention is the technology disclosed in Japanese Patent Publication No. 7549/1983 (B23K11/14), and its main points are shown in FIGS. 10 and 1.
It is shown in Figure 1. In this structure, an inner shaft 2 is slidably assembled inside a hollow outer shaft 1, and a magnet (permanent magnet) 4 that attracts a component (projection nut) 3 is fixed to the tip of the inner shaft 2. be. The outer cylinder 5 housing the outer shaft 1 is fixed to a stationary member 6 as shown in the figure, and the outer shaft 1 is inserted into a guide groove 7 provided in the inner surface of the outer cylinder 5 in the stroke direction.
A pin 8 fixed to is inserted. The other sheet metal part 9 is placed on the fixed electrode 10, and the guide pin 11 of the fixed electrode penetrates the hole in the sheet metal part 9 and extends upward.

The end surfaces of both shafts 1 and 2 are aligned on one plane to be flush, and the nut 3 is attracted thereto. In this state, when both shafts advance together and reach a certain point, the advancement of the inner shaft 2 is prohibited, only the outer shaft 1 advances, and the nut 3 is moved to the magnet as shown in Figure 10. 4, the magnetic force on the nut 3 is substantially eliminated. By doing this,
The nut 3 moves away from the lower end surface of the outer shaft 1 and jumps toward the guide pin 11, and the guide pin 11 is fitted into the screw hole of the nut 3, and feeding is completed. .

Although the above-mentioned structure for prohibiting the advancement of the inner shaft 2 is not shown, a restriction pin fixed to the inner shaft 2 is protruded from a long hole in the outer shaft, and both shafts 1 and 2 are advanced by a certain amount. Then, the restriction pin is locked to a stationary member, so that the advancement of the inner shaft 2 is forcibly stopped, and the outer shaft 1 is stopped.
Only the magnet 4 moves forward as shown in Figure 11.
The suction force of the nut is reduced, and the nut is fitted into the guide pin 11 by inertia.

(c) Problems to be resolved by the invention In the prior art as described above, the suction force of the magnet 4 does not act sufficiently on the nut due to the threaded hole in the nut 3, and the inner shaft 2
When attaching the magnet 4 to the magnet, there is a limit to the size of the magnet. Furthermore, since the nut 3 is in contact only with the end surfaces of both shafts 1 and 2, if any external force or vibration occurs, the nut 3 will shift position and the alignment between the screw hole and the guide pin 11 will be impaired. , a phenomenon occurs in which the nut 3 is thrown off by the guide pin 11. In FIG. 11, the section in which the nut moves in the air is indicated by the symbol L.

(d) Means for solving the problem and its effect The present invention was provided in order to solve the above-mentioned problems. is supported in a tilted position with respect to the vertical direction so that it can move forward and backward, and a magnet that applies a suction force to the outer surface of the component protrudes from the supply rod. A component supply passage is installed so that the component enters toward the magnet in a protruding state, and when the supply rod advances and removes the component, the magnet is retracted. The component is received from the underside of the rod by a magnet and held under suction.This allows the component to be stably positioned at the tip of the rod and advances the supply rod, while the magnet moves backward to attract the component. The holding force is released to ensure that the supply to the target location is completed.

(E) Embodiment To explain the embodiments shown in FIGS. 1 to 5, this is a case of a spot welding device as shown in FIG.
2 is placed on the fixed electrode 13, and the guide pin 14 of the electrode protrudes from the steel plate component 12. Reference numeral 15 is a movable electrode installed coaxially with the fixed electrode 13.

The supply unit 16, which constitutes the main part of the supply device according to the present invention, includes a projection nut (in this embodiment, it is a projection nut) 1.
7 supply pipes 18 are connected thereto, and an air cylinder 19 is also connected thereto. The supply rod 20 is supported in an inclined state as shown in the figure with respect to the vertical direction. The nut 17 is in close contact with the end surface of the supply rod 20, as shown by the two-dot chain line in FIG. 1, and there is a protrusion 21 that holds the nut 17 from the outside.
is provided. The illustrated projection 21 is shaped like a U-shaped frame as shown in FIG. The feed rod 20 is suitably made of stainless steel.

The magnet 22 that applies a suction force to the outer surface of the nut 17 is located at a position protruding from the end surface of the supply rod 20, and moreover, the supply rod 20 is inclined.
It is installed below the supply rod 20 and can move forward and backward relative to the supply rod 20. In this embodiment, the supply rod 20 has a double inner and outer structure in order to move the magnet 22 forward and backward, and the supply rod 20 itself has a hollow shaft 25, into which the inner shaft 24 is slidably inserted. It has been done. The magnet 22 is connected to a sliding body 25 that is in contact with the outer surface of a hollow shaft 23, and the inner shaft 24 and the sliding body 25 are integrated via a bolt 26. A long hole 27 is formed in the hollow shaft 23 in the stroke direction, and the bolt 26 passes through this long hole.

The lower end surface of the inner shaft 24 can be brought into 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) therein for applying a light upward attractive force to the nut 17. 28 is embedded.

The supply rod 20 is housed in an outer cylinder 29 with a gap as shown in the figure, and an air cylinder 19 is connected to the upper side of the outer cylinder 29, and a supply pipe 18 is welded to the lower side. A piston rod 30 of the air cylinder 19 is connected to the supply rod 20. A regulating pin 31 is fixed to the inner shaft 24 and projects from the supply rod 20 through an elongated hole 32 opened in the stroke direction of the hollow shaft 23. A coil spring 33 inserted into the hollow shaft 23 exerts its tension on the inner shaft 24, and this tension is regulated by the regulation pin 31 in contact with the lower end of the elongated hole 32.

A drive device 34 is attached to the outer side of the outer cylinder 29 for retracting the magnet 22 after the supply rod 20 advances a predetermined amount and stops, or almost simultaneously with the stop. As this driving device, an electromagnetic solenoid or the like may be used, but here an air cylinder 35 is used, and a locking piece 37 fixed to the piston rod 36 is connected to a long hole 37 formed in the outer cylinder 29 in the stroke direction. It protrudes into the outer cylinder 29 through the cylindrical member 29, and faces the aforementioned restriction pin 31 so as to be able to abut against it.

As is clear from FIG. 2, the supply rod 20 (hollow shaft 23) has an oval cross-sectional shape by forming flat surfaces 39 and 40 on both sides. It fits into the opened through hole 42 and is prevented from rotating. The upper plate 41 is provided with a notch 43 for receiving the sliding body 25.

The supply pipe 18 has a rectangular cross section, and has bifurcated protrusions 45 and 46 by providing a cutout 44 as shown in FIG. Opening/closing plates 49 and 50 are pivotally mounted. In short, one wing piece of the hinge is the opening/closing plate 49,
50, and the other wing piece is fixed to the projecting pieces 45, 46 with bolts 53, 54 as fixed plates 51, 52. The helical springs 55 attached to the pivots 47, 48 (only the pivot 47 side is shown in FIG. 5) give elasticity in the closing direction to the opening/closing plates 49, 50 to maintain the state shown in FIG. 4. are doing. The two-dot chain line in FIG. 5 shows the state in which the opening/closing plate 49 is pushed open.

Since the lower part of the supply rod 20 passes through the through hole 42 as described above, the nut 17 from the supply pipe (component supply passage) 18 is connected to the magnet 2.
It is configured to enter towards 2.

To explain the operation of the embodiment described above, when the nut pushed by compressed air or the like moves inside the supply pipe 18 and reaches near the end of the supply pipe 18, the nut 17 is attracted by the magnet 22. and is introduced into the protrusion 21, as shown by the two-dot chain line in FIGS. 1 and 4. That is, the nut 17 is received by the magnet 22 from below and held by suction. Next, when the supply rod 20 moves forward, the opening/closing plates 49 and 50 are pushed open by the nut 17, and the nut 17 moves forward while being attracted and held by the magnet 22, until it comes right near the guide pin 14 of the fixed electrode. Stop. After that, when the air cylinder 35 is operated and the locking piece 37 is pulled up, the regulating pin 31, the inner shaft 24, the bolt 26
The displacement is transmitted to the sliding body 25 through The nut supply is completed after the guide pin 14 penetrates.

Although the supply rod 20 in FIG. 7 is inclined as shown in FIG. This is a type in which relative retraction of the magnet 22 is obtained by engaging with the member. As this stationary member, a projecting piece 56 that projects inside the outer cylinder 29 is the most easily realized example. In this type of format, magnet 2
Even after the nut 2 stops, the supply rod 20 moves forward, and after the nut 17 is separated from the magnet 22 to some extent, the attractive magnetic force on the nut substantially disappears and the supply rod 20 stops, and at the same time the nut 17 is moved by inertial force. It escapes from the protrusion 21 and is supplied to the guide pin 14. In this embodiment, the magnet 28 as described above is not used and the lower end of the inner shaft 24 is not exposed to the lower surface of the supply rod 20.

In the embodiment shown in FIG. 8, the protrusion at the end of the supply rod is modified.In the previous embodiment, the protrusion 21 was U-shaped, but here it has two protrusions facing each other on the outside of the nut. 57 and 58, instead, the magnet 22 closes the opening as shown in FIG.
It has come to be in direct contact with

Figure 9 is also shown straight, similar to Figure 7.
In this embodiment, the magnet 22 is moved forward and backward by an operating rod 59 placed along the outside of the supply rod 20. In order to ensure smooth sliding with the supply rod 20, an operating rod 59 is provided between the guide tubes 60 and 61. A rod 59 is installed. A coil spring 6 is installed between the flange 62 of the guide tube 60 and the flange 63 of the supply rod.
The tension of the coil spring 64 is received by inserting a pin 66 fixed to the guide cylinder 60 into a groove 65 formed in the stroke direction of the supply rod 20 with a pin 66 interposed therebetween. supply rod 20
As the whole unit moves forward, flange 6
2 is stopped by the protruding piece 56, and the same supply as shown in FIG. 7 is achieved.

(F) Effect According to the present invention, even if the part has a hole such as a nut, suction and holding force is applied to the outer surface of the part and from the bottom, so that the suction and holding force is applied to the outer surface of the part from the bottom. The retention of the parts becomes very stable, and there is no possibility that the parts will come off or become misaligned during the advance of the supply rod. Furthermore, even if the weight or size of the part increases, since the magnet installation position is as described above, the magnet can be installed accordingly, and in this aspect as well, the stable holding of the part is ensured. achieved.

Furthermore, since the relative positions of the magnet and the component supply passage are in the above-mentioned relationship, the component rushes toward the magnet below with great force, so that the component does not get caught on the way. The magnet can be reliably reached, and highly reliable operation can be obtained in this aspect as well. As described above, when the component is firmly held due to the tilted state and the magnet receiving, when the supply rod advances to release the component, the magnet is moved back and the suction force is virtually eliminated. Therefore, the parts can be reliably separated from the supply rod, and supply reliability is extremely high.

[Brief explanation of drawings]

Figures 1 to 9 are examples, in which Figure 1 is a vertical side view, Figure 2 is a 2-2 sectional view of Figure 1, Figure 3 is a three-dimensional view, and Figure 4 is a vertical front view. Figure 5 is a side view of the opening/closing plate, Figure 6 is a side view showing the external appearance of the device, and Figure 7 is a side view of the opening/closing plate.
The figure is a longitudinal side view, FIG. 8 is a three-dimensional view, and FIG. 9 is a side view. Figures 10 and 11 are conventional examples,
Each is a longitudinal side view. 20... Supply rod, 17... Parts, 22...
Magnet, 18... Parts supply passage.

Claims (1)

[Claims] 1. In a device that supplies parts in close contact with the end face of the supply rod, the supply rod is supported in a tilted position with respect to the vertical direction so that it can move forward and backward, and a magnet that applies suction force to the outer surface of the part is attached from the supply rod. A component supply passage is placed below a supply rod which is capable of moving forward and backward into a protruding position and is inclined, and a component supply passage is installed so that the parts can approach the protruding magnet. A tilting advance/retreat type component supply device characterized in that a magnet is moved backward when a component is removed.