JPH01148475A - Part feeding method - Google Patents

Abstract

PURPOSE:To always uniformize the position and time from which a part is apart and to stabilize the feeding of parts by forcibly retreat a magnet after the part of the tip part of a feeding rod being stopped by reaching an objective place or nearly simultaneously with this stoppage. CONSTITUTION:When the nut pushed by a compressed air, etc., moves inside a feeding pipe 18 and comes to near the end part of the feeding pipe 18, a nut 17 is led into a projection 21 by being attracted by a magnet 22. When a feeding rod 20 is then advanced, an opening and closing plate is opened by its push and the nut 17 is advanced with being held by being attracted by the magnet 22, and stopped by coming to just close to the guide pin of a fixed electrode. Thereafter, an aircylinder 35 is operated and a locking piece 37 is lifted, then the magnet 22 is separated from the nut 17 with the displacement being transferred to a sliding body 25. Now the attractive magnetic force to the nut 17 is really dissipated, the screw hole of the nut receives the penetration of the guide pin and the nut feeding is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field This invention supplies parts such as a projection nut with an m-wearing protrusion, a short thick-walled pipe, or a bolt with a head. Regarding the supply method for

Prior art The prior art that is considered to be closest to the present invention is the
This is a technique disclosed in Publication No. 7549 (R23K 11/1a), and its main points are shown in FIGS. 9 and 10. In this, an inner shaft 2 is slidably assembled inside a hollow outer shaft 1, and a part (projection nut) is attached to the tip of the inner shaft 2.
A magnet (permanent magnet) 4 that attracts the magnet 5 is fixed. The outer cylinder 5 housing the outer shaft 1 is fixed to a stationary member 6 as shown in the figure, and a pin 8 fixed to the outer shaft 1 is fitted into a guide groove 7 provided in the stroke direction on the inner surface of the outer cylinder 5. be. The counterpart sheet metal part 9 is placed on the fixed electrode 10, and the fixed 4-pole guide pin 1
1 passes through the hole in the sheet metal part 9 and extends upward.

The end surfaces of both shafts 1.2 are aligned on one plane and flush, and the nut 3 is attracted thereto.

In this state, when both shafts advance together and reach a certain point, the inner shaft 2 is prohibited from advancing, and only the outer shaft 2 advances, and the nut 3 becomes magnetized as shown in Figure 10. 4, and the magnetic force on the nut 3 is substantially eliminated. By doing this, the nut 5 moves away from the lower end surface of the outer shaft 1 and jumps toward the guide pin 11,
The supply is completed when the guide pin 11 is fitted into the screw hole of the nut 3. Note that FIG. 10 shows the distance of spatial movement.

Although the ninth structure for prohibiting the advancement of the inner shaft 2 described above is not shown, a regulation pin fixed to the inner shaft 2 is made to protrude from a long hole in the outer shaft,
After both shafts 1.2 have advanced a certain amount, the restriction pin is locked to a stationary member, so that the advancement of the inner shaft 2 is forcibly stopped, and only the outer shaft 1 is moved forward as shown in FIG. 10. As the nut moves forward, the attraction force of the magnet 4 to the nut decreases, and the nut is fitted into the guide pin 11 by inertia.

1/1 Problems to be Solved by the Invention With the prior art as described above, the attractive magnetic force on the nut 6 is substantially eliminated during the transition period when the magnet stops and the outer shaft moves further forward. Therefore, the following problems arise.

In other words, the first problem is that while only the outer shaft is moving, the magnetic force on the nut gradually decreases, and some external force or vibration is applied before the nut reaches the designated location. If it acts on the nut, the nut will inadvertently fall down, resulting in a feeding error. The second problem is that it depends on the phenomenon in which the attractive magnetic force to the nut virtually disappears, so due to variations in the weight of the nut or the stickiness of oil attached to the nut, the nut may be pulled away from the outer shaft. The timing of the separation is not constant, and the length of the nut's spatial movement varies, which poses a problem in stabilizing the supply accuracy.

Since the above-mentioned movement distance is long and short, it is necessary to set the distance to be long to some extent depending on the longest case, and this point also lengthens the aerial movement and causes a supply error.

B) Means for solving the problem and its operation The present invention was provided in order to solve the above-mentioned problems. A magnet that applies a suction force to the side surface is installed in a position protruding from the supply rod so that it can move back and forth, and the magnet is forcibly retreated after the supply rod reaches the target location and stops, or almost simultaneously with this stop. It is characterized by the fact that, by the attraction force of the magnet applied to the outer surface of the part, a constant attraction magnetic force is applied while the supply rod is moving forward, and the attraction magnetic force is increased after the part reaches the target location or almost at the same time. disappears and completes supply to the destination.

(E) Embodiment To explain the embodiments shown in FIGS. 1 to 5, this is a case of a spot welding apparatus as shown in FIG. The id pin 14 of the same electrode protrudes from the steel plate component 12.

Reference numeral 15 is a movable electrode installed coaxially with the fixed electrode 13.

Supply unit 1 incorporating the supply rod according to the present invention
6 is connected to a supply pipe 18 of a projection nut (in this embodiment, a projection nut) 17 and an air cylinder 19 is connected thereto.

A nut 17 is brought into close contact with the end surface of the supply rod 20, as shown by the two-dot chain line in FIG. 1, and a protrusion 21 for holding the nut 17 from the outside is provided. Protrusion 2 shown
1 is shaped like a U-shaped frame as shown in FIG. The feed rod 20 is suitably made of stainless steel.

A magnet 22 that applies an attractive force to the outer surface of the nut 17 is located at a position 9 protruding from the end surface of the supply rod 20 and is movable toward and away from the supply rod 20 .

In this embodiment, in order to move the magnet 22 forward and backward, the supply rod 20t has a double outer circular structure, and the supply rod 20 itself has a hollow shaft 23, and an inner shaft 24 is slidable inside the shaft 23. This is an insert. The magnet 22 is connected to a sliding body 25 that is in contact with the outer surface of the hollow shaft 25C, and the inner shaft 24 and the sliding body 25 are connected to each other by bolts 26.
integrated through. An elongated hole 27 is formed in the hollow shaft 23 in the stroke direction, and the bolt 26 passes through this elongated hole'.

The lower end surface of the inch 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 ninth small magnet that applies a light upward suction force to the nut 17. (Permanent magnet) 28 is embedded.

The supply rod 20 is housed in an outer cylinder 29 with a gap t as shown in the figure, 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.

The piston rod 3o of the air cylinder 19 is the supply rod 2
It is connected to 0. A regulating pin 51 is fixed to the inner shaft 24 and protrudes from the supply rod 20 through a second elongated hole 52 in the stroke direction of the hollow @ 25 . A coil spring 35 inserted into the hollow shaft 23 exerts its tension on the inch shaft 24, and this tension is regulated by the regulating pin 61 hitting the lower end of the elongated hole 32.

The supply rod 20 advances a predetermined amount and stops, that is, after the component reaches the target location or almost simultaneously with this stop, the drive device 11 moves the magnet 22t back.
54 is attached to the outer side of the outer cylinder 29.

This driving device may be an electromagnetic cylinder or the like, but in this case, a 55t air cylinder is used.
A locking piece 37 fixed to the piston rod 36 is attached to the outer cylinder 2.
It protrudes into the outer cylinder 29 through an elongated hole 3B formed in the stroke direction at 9, and faces the aforementioned regulation 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 59 and 40 on both sides, and fits snugly into the through hole 42 formed in the upper plate 41 of the supply pipe 18 to prevent rotation. is being done. The upper plate 41 is provided with a notch 45 for receiving the sliding body 25.

The supply pipe 18 has a rectangular cross section, and a cutout 44t as shown in FIG.
5 and 46'ii are provided and fixed thereto, and opening/closing plates 49 and 50 are pivotally attached to the next pivots 47 and 48. In short, one wing of the hinge serves as an opening/closing plate 49.50, and the other wing serves as a fixed plate 51.52 and is fixed to the protrusion 45.46 with bolts 55.54. Helical spring 55 assembled to pivots 47 and 48 (only the side of pivot 447 is shown in Figure 5)
gives elasticity to the opening/closing plates a9, 50 in the closing direction to maintain the state shown in FIG. 4. The two-dot chain line in FIG. 5 indicates a state in which the opening/closing plate 49 is pushed open.

Following the above description, the operation of the following embodiment will be explained. When the nut pushed by compressed air or the like moves inside the supply pipe 18 and comes near the end of the supply pipe 18, the nut 17 is attracted by the magnet 22. and introduced into the protrusion 21, as shown by the two-dot chain line in FIGS. 1 and 4. Next, when the supply rod 2o moves forward, the opening/closing plate 49 is opened by the nut 17.
．． 50 is pushed open, the nut 17 is attracted and held by the magnet 22 and advances until it comes to a position close to the fixed polarization guide pin 14 and stops. After that, air cylinder 3
5 is activated and the locking piece 57 is pulled up, the regulating pin 5
1. Inner shaft 24, fl moving body 25 via bolt 26'ji
As the displacement is transmitted to the nut 140, the magnet 22 (and the pond magnet 28 at the same time) moves away from the nut 17, so that the attractive magnetic force to the nut 17 is substantially eliminated, and the screw hole of the nut passes through the hole 140. The supply of nuts is completed.

If the supply cycle is such that the supply rod 20 may operate at a relatively low speed, the magnet 22 may be retracted a short time after the supply rod 20 stops; however, the supply cycle may be shortened. In this case, it is appropriate that the magnet 22 is retracted almost simultaneously with the stop of the supply rod 20. "Almost simultaneously" means a wide range of time periods, including immediately before the supply rod 20 stops, completely simultaneously with the stop, and immediately after the stop.

In the embodiment shown in FIG. 7, the protrusion at the end of the supply rod is made with modified metal. In the previous embodiment, the protrusion 21 is double-shaped, but in the embodiment, the protrusion 21 is shaped like two arrows facing each other on the outside of the nut. 56.57, and instead of magnet 22
closes the opening as shown in FIG. 7, so that the magnet 22 comes into direct contact with the nut 17.

In the embodiment shown in Fig. 8, the next work x is placed along the outside of the supply rod 2o.
Since the magnet 22 is moved forward and backward by bA'sa, 62 is used to ensure smooth sliding with the supply rod 2o.
The tension of the coil spring 65 is received by inserting a coil spring 6S'l between the supply rod 20 and a pin 65 fixed to the guide plate 59 in a groove 64 formed in the stroke direction of the supply rod 20. .

After the entire supply rod 20 advances as one and stops at the target location, the same movement operation as described above is performed, and the locking piece 37 forcibly moves the flange 61 back. It is designed to allow

In this embodiment, the tip of the supply rod 20 is not provided with anything corresponding to the projection 21 or the magnet 2B as described above, but only a flat end surface.

(F) Effect: According to the method of the present invention, the magnetic attraction force on the component is maintained at a constant value until the supply rod reaches the target location, so that no external force or vibration of any kind occurs during the movement of the component. Even when acting on the part, the part does not easily come off the tip of the supply rod.

In addition, since the magnet is forcibly retracted after the component at the tip of the supply rod reaches the destination and stops, or almost simultaneously with this stop, the position and timing of the component leaving the supply rod must always be uniform. This enables a stable supply of nine parts. In particular, since the magnetic force is released after the component reaches the target location, it is possible to remove the component at a location close to the guide pin of the pole, for example, thereby completely preventing component feeding errors. .

[Brief explanation of the drawing]

Figures 1 to ＠a are examples, and Figure 1 is a longitudinal sectional side view.
Figure 2 is a <2)-(2) sectional view of Figure 1, Figure 3 is a three-dimensional view, Figure 4 is a longitudinal 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, Figure 7 is a three-dimensional view, and Figure 8 is a side view showing the external appearance of the device.
The figure is a side view. Figures 9 and 10 are conventional examples,
FIG. 3 is a longitudinal side view. 20... Supply rod, 17... Parts, 22... Magnet.

Claims (1)

[Claims] In devices that supply components in close contact with the end surface of a supply rod, a magnet that applies a suction force to the outer surface of the component is installed at a point protruding from the supply rod so that it can move forward and backward, and when the supply rod reaches the destination. A component supply method characterized in that the magnet is forcibly retracted after or almost simultaneously with the stop.