JPH0516997B2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to a device for supplying parts such as projection nuts having welding protrusions and cap nuts having similar protrusions. It can be used regardless of the presence or absence of wood.

(b) Prior art FIG. 17 shows a guide pin 2 at the tip of a supply rod 1, which is connected to a projection nut 3.
Nuts are supplied while the nut is inserted into a screw hole, and the nut is held by suction and held by an electromagnet 4 fixed to a stationary member during feeding.

In addition, the one shown in FIG. 16 is for fitting an oil seal 5 onto a shaft 6, and a hollow outer shaft 7 is used.
and an inner shaft 8 are combined in a slidable manner, and when the oil seal 5 fitted on the inner shaft 8 abuts against the shaft 6, only the outer shaft 7 is relatively lowered. The oil seal 5 is forcibly moved toward the shaft 6 side.

(c) Problems to be Solved by the Invention In the conventional example shown in FIG. 17, as the supply rod 1 advances downward, the nut 3 becomes farther away from the electromagnet 4, so that the electromagnetic attraction force on the nut 3 decreases. decreases and some kind of vibration acts on it,
The nut 3 may accidentally fall before reaching the destination. In addition, because of this concern, it is necessary to always insert the guide pin 2 into the screw hole, so there is a problem that it cannot be used with cap nuts or nuts with lids that do not have through holes. .

In the conventional example shown in FIG. 16, it is difficult to accurately hold the oil seal 5 at the tip of the inner shaft 8. Since the oil seal 5 has some dimensional variation in its inner diameter, the degree of fitting to the inner shaft 8 varies, and in the worst case, the oil seal 5 may fall off by itself.

As described above, the present invention prevents instability in component retention due to electromagnets, reliably obtains applicability to components without through holes, and provides component retention in a double-structured supply rod. The challenge is to resolve this uncertainty.

(d) Means for Solving the Problems and Their Effects The present invention was provided to solve the above-mentioned problems, and provides a system in which a supply rod is slidable inside a hollow outer shaft. It consists of a fitted inner shaft, a magnet is provided at the tip of the inner shaft to attract and hold the component, and a protrusion is provided at the tip of the outer shaft to hold the component in a state surrounding the outside of the component. This protrusion is provided with a notch that serves as an entrance for the part to enter into the protrusion, and the part is forcibly pushed out by applying relative displacement to both shafts near the part supply point. The parts that enter the protrusion from the notch that serves as the entrance are held at the tip of the supply rod in a surrounded state, and the parts that enter the protrusion are held at the tip of the supply rod at the point where the supply rod advances. It is supplied to a predetermined location by being pushed away by a mechanical advance, and the structure of the protrusion and its role are particularly important features.

(E) Embodiment FIGS. 1 to 3 are vertical sectional views showing the basic principle on which the present invention is based, in which the supply rod 9 is in a state where it can slide inside the hollow outer shaft 10. A magnet 12 is fixed to the tip of the inner shaft 11. The inner shaft 11 receives elasticity in the extrusion direction by a coil spring 13, and the inner shaft 11
The regulating pin 14 fixed to the outer shaft 10
The lower limit position of the inner shaft 11 is determined by the contact with the lower part of the elongated hole 15 .
The outer shaft is made of a non-magnetic material such as stainless steel.

An actuating rod 16 is connected to lower the entire supply rod 9, and the rod 16 is moved forward and backward by the output of a fluid cylinder (not shown). A stopper member 17 fixed to a stationary member receives the regulating pin 14, and a magnetic component 18 is attached to the tip of the supply rod 9.
is attracted and held by the magnet 12.

In FIG. 2, the entire supply rod 9 is being advanced, and the regulating pin 14 is approaching the stopper member 17. When the supply rod 9 advances sufficiently, the regulating pin 14 is moved to the stopper member 17.
, so the advancement of the inner shaft 11 itself stops there, but the outer shaft 10 continues to advance while compressing the coil spring 13, so the component 18 is forcibly moved against the magnet 1.
2, thereby causing the magnet 12 to
The suction force decreases, and finally the component 18 is separated from the tip of the outer shaft 10 and fed into the recess 20 of the counterpart component 19, as shown in FIG.

The parts indicated by the reference numeral 18 include the projection nut 22 with the lid 21 shown in FIGS. 4 and 5, and the cap nut 2 shown in FIG.
3, where the through hole is not open, is typical, but as can be easily understood from the configuration and operation described below, the present invention is effective even when the through hole is open. It can be utilized.

FIG. 7 is an enlarged view of the tip of the supply rod 9, and FIG. 8 shows an annular protrusion 24 provided on the end surface of the outer shaft 10 to prevent the nut 18 being sucked and held from slipping. be.

Next, the embodiments shown in FIGS. 9 to 15 will be described. As shown in FIG. 9, this is a case of spot welding equipment, in which the mating steel plate part 28 is placed on a fixed electrode 29, and the guide pin 30 of the electrode is moved from the steel plate part 28. It is in an outstanding state. Reference numeral 31 is a movable electrode installed coaxially with the fixed electrode 29.

A component supply pipe 33 is connected to the supply unit 32, and an operating cylinder 34 is also connected thereto. The details of the supply unit 32 are shown in FIG. 10. The outer shaft 10 is connected to the operating rod 16 of the air cylinder 34, and the inner shaft 11 is installed inside the outer shaft 10. The regulating pin 14 is connected to the outside through the elongated hole 15. It stands out. Actuation rod 1
6 moves forward, both shafts 10 and 11 move down as one without causing any relative displacement, but at this time, the regulating pin 14 moves inside the elongated hole 36 of the outer cylinder 35, When it hits the lower end 17 of the hole 36 (corresponding to the stopper member 17), the inner shaft 11 remains stopped and only the outer shaft 10 moves forward, resulting in the above-described operation. Note that the outer cylinder 35 is an air cylinder 34.
are strongly connected.

The end of the supply pipe 33 is bifurcated as shown in FIG. 11, and a guide plate 37 is fixed to the end face thereof. An outer cylinder 35 is welded to the upper side of the end of the supply pipe 33, thereby forming a temporary locking chamber 38 for the nut 18 at the forked portion described above.
It is open downwards. As is clear from FIG. 12, the opening/closing plate 4 has pivots 39 and 40 on the left and right sides.
1 and 42 are provided, and the first
It is given elasticity in the closing direction as shown in Figure 2.

A magnet 43 is embedded in the guide plate 37 to promote the entry of the nut 18 into the temporary fixing chamber 38 and to temporarily fix the nut.

Next, the lower end of the supply rod 9 will be explained according to FIGS. 13 to 15. The end of the outer shaft 10 is provided with a notch 44 that becomes the entrance of the nut 18, and the opposite side By providing the notch 25 in the nut 18, a pair of arcuate protrusions 45 and 46 are formed, which hold the nut 18 in a state surrounding it (see FIGS. 13 and 14). There is. Note that it is also possible to stop the notch 25 and leave only one horseshoe-shaped protrusion. The locking step portion 47 is formed by making the protrusions 45 and 46 slightly thinner, and in order to bring the guide plate 37 closer to the center of the nut 18, one side of the outer shaft 10 is made flat. This part is especially shown in Figures 10 and 13.
It is designated by the reference numeral 48 as is clear from the figure.
In order to adjust the position of the lower end 17 of the elongated hole according to the situation, a sliding ring 49 is fitted to the outer cylinder 35, and the positioning is performed with a bolt 50 after adjustment.

When the supply rod 9 is at its most retracted position, its protrusions 45 and 46 protrude into the temporary locking chamber 38, and the nut 18 that has passed through the supply pipe 33 passes through the notch 44 while being attracted by the magnet 43. The nut 18 is then stopped between the protrusions 45 and 46, and the outside of the nut 18 is held. In this case, since the nut 18 is also attracted upward by the magnet 12 on the inner shaft side, the upper surface of the nut is attached to the locking step 4.
7, the corners of the nut also come into contact with the inner surfaces of the protrusions 45 and 46 due to the suction force of the magnet 43, thereby positioning the nut in the temporary fixing chamber 38.

When the nut 18 enters, the notch 4
4 must pass smoothly, the attraction force of the magnets 12 and 43 is set to a stronger value for the latter. By doing this, the suction force toward the guide plate 37 side becomes dominant, and the nut can be entered into the temporary fixing chamber 38, that is, between the protrusions 45 and 46 with a strong force, and the other magnet The vertical positioning is achieved by the suction force exerted by the nut 12, and the nut is temporarily locked in the correct position.

As mentioned above, the basic principles shown in Figs. 1 to 8 have been converted into practical structures in the concrete examples shown in Figs. 9 to 15. This is the same as that described in FIGS.

(f) Effects According to the present invention, the component is attracted by the magnet fixed to the inner shaft of the supply rod, and the outside of the component is held in a state surrounded by the protrusion at the tip of the outer shaft. Therefore, the parts will not fall off to the target location without permission, and will be reliably supplied regardless of whether or not the parts are perforated. In addition, the protrusion has a notch that serves as the entrance, so
Parts can be reliably entered and a stable holding state can be obtained. Since entry into the protrusion and retention are performed simultaneously without requiring any special positioning, rapid operation is realized in a short period of time, which is extremely advantageous for improving productivity. By applying a relative sliding displacement to both the inner and outer shafts that are slidably combined, the part is forcibly pushed away from the magnet, and the part is pushed just before the target location. parts are reliably released, thus ensuring reliable parts supply. As described above, the present invention provides the first
This definitely solves the uneasy problems in Figures 6 and 17.

[Brief explanation of the drawing]

Figures 1 to 15 show embodiments of the present invention, Figures 1 to 3 are longitudinal sectional side views showing the principle structure in the order of operation, and Figures 4 and 5 are of the projection nut. A side view and a plan view, FIG. 6 is a vertical sectional view of the cap nut, FIGS. 7 and 8 are vertical sectional views showing the tip of the supply rod, and FIG. 9 is a side view when applied to a spot welding machine. , FIG. 10 shows the supply unit 32
FIG. 11 is a cross-sectional plan view showing the tip of the supply pipe, FIG. 12 is a 12-12 sectional view of FIG. 10, and FIG. 13 is a bottom end view of the outer shaft.
Figure 14 is a 14-14 sectional view of Figure 13, and 15
The figure is a three-dimensional view showing the lower end of the outer shaft 10. FIG. 16 and FIG. 17 are conventional examples, and are longitudinal sectional views, respectively. 9... Supply rod, 10... Outer shaft, 11... Inner shaft, 18... Parts,
12...Magnet, 44...Notch, 45,4
6... Protrusion.

Claims (1)

[Claims] 1 The supply rod is composed of a hollow outer shaft and an inner shaft slidably fitted inside the inner shaft, and a magnet is provided at the tip of the inner shaft to attract and hold the parts, and the tip of the outer shaft A protrusion is formed to hold the part in a state surrounding the outside of the part, and this protrusion is provided with a notch that serves as an entrance for the part to enter into the protrusion. 1. A component supply device characterized in that the component is forcibly pushed out by applying relative displacement to a shaft.