JPH07196145A - Part feed speed control device - Google Patents

Abstract

PURPOSE:To disperse a bumping force of a part so that the part can be received, by supporting opposite sides of a stopper surface of a retractable regulating member for once stopping the part on a supply passage. CONSTITUTION:At first, a through-hole 40 in a regulating member 18 is aligned with a supply passage 6 so as to allow conveying air to ventilate. When a part 1 approaches a regulating member 18, it is returned to a position indicated by the solid line through the operation of an air cylinder 20, and accordingly, a flat stopper surface 39 can receive a coming part. When the part 1 is conveyed at a high speed from a part feeder 5, it is received by the flat stopper surface 39. When the regulating member 18 is retracted, the part 1 passes through the through-hole 40 and is then attracted by a magnet 15 while it drops. Then, it comes a stop at a position indicated by the two-dot chain line, and is held at the front end part of a feed rod 10. Since the regulating member 18 is supported on both sides of its stopper surface 39, the part 1 can be received with the bumping force of the part 1 being dispersed, thereby it is possible to prevent rattling and inferior operation of the regulating member 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling the supply speed of parts, and is particularly suitable for handling projection bolts and stud bolts.

[0002]

2. Description of the Related Art As a prior art closest to the present invention, there is a technique disclosed in Japanese Patent Application Laid-Open No. 5-244644, which was invented by the applicant of the present application. What is disclosed here is that a restricting rod 18 that traverses the inside of the component supply pipe 8 (the same reference numerals as those in the above-mentioned publication are represented here) is installed so as to be able to move forward and backward in a cantilevered state. In addition, the restriction rod 18 is made of a bar material having a circular cross section.

[0003]

In the prior art as described above, since the regulating rod, which is a means for temporarily stopping the component, is cantilevered, the component moves vigorously to the regulating rod. When a collision occurs, an excessively large gap is created between the regulation rod and the inner surface of the hole supporting the regulation rod, which causes rattling in the advancing / retreating operation of the regulation rod, and the position of the regulation rod may be misaligned. The smooth forward / backward movement may be hindered or, in extreme cases, the restriction rod may be damaged. Furthermore, since the control rod is made of a rod with a circular cross section, the part is stopped in an inclined posture when the part collides, so when the part starts the next movement, the inner surface of the part supply pipe There is a risk of getting caught in.

[0004]

[Means for Solving the Problem and Its Action] The present invention was devised to solve the above-mentioned problems.
According to a first aspect of the present invention, a component holding means is provided at the end of the supply passage, and means for temporarily stopping the component is installed in the supply passage at a position separated by a required distance from the means, and the component is temporarily stopped. The means is composed of a retractable restricting member that traverses the supply passage, and the restricting member is supported on both sides of its stopper surface,
Even if the component violently collides with the stopper surface, the impact force is dispersed and received by the restricting member in the both-sided state. A second aspect of the present invention is characterized in that, in the first aspect, the component holding means is formed on the advancing / retreating supply rod, and the advancing / retreating shielding member is installed on the advancing side of the component and the supply rod. When reaching the holding means, the shielding member is closed in advance to prevent falling of parts and intrusion of impurities. Furthermore, the magnetic adverse effect on the parts is prevented. According to a third aspect of the present invention, in the first aspect, the component holding means is a mechanism for elastically holding the component of the stud welding device, and the component holding mechanism is based on the elastic principle by the controlled component speed. Works fine.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Explaining the embodiments of FIGS. 1 to 5, a component 1 dealt with here is an iron projection bolt consisting of a shaft portion 2, a circular flange 3 and a welding projection 4. The component 5 reaches the component holding means 7 from the feeder 5 through the supply passage 6, and 8 is a component supply pipe. A guide pipe 9 is welded to the supply pipe 8 in a direction orthogonal to the component supply pipe 8, and the supply rod 1 is movable in and out of the guide pipe 9.
0 is inserted, and the supply rod 10 is coupled to the piston rod 12 of the air cylinder 11 attached to the end of the guide tube 9.

Although various types of parts holding means 7 are conceivable, a magnetic type is illustrated here. That is, the recess 13 is formed in the upper surface of the tip of the supply rod 10.
The shape is such that the right side is open and the left side is provided with the circular arc portion 14 that matches the flange 3. A magnet (permanent magnet) 15 is embedded in the recess 13 and covered with a protective plate 16. As can be seen from FIGS. 1 and 2, the magnet 15 is arranged so as to be offset toward the arc portion 14, so that the flange 3 fits exactly to the arc portion 14 and the component 1 and the supply rod 10 are connected. The relative position of is always kept uniform. In order to make the magnetic force of the magnet 15 act more strongly on the component 1, the supply rod 10 protection plate 16,
The guide tube 9 and the like are preferably made of non-magnetic stainless steel. When the magnet 15 is of an electromagnet type, although not shown, the supply rod 10 may be made of iron and penetrate the inside of the exciting coil.

The means 17 for temporarily stopping the component is installed at a position separated from the component holding means 7 by a distance of one component, and the regulating member 18 is adopted as a main member of the means 17. There is. This member 18 is formed by forming a thick plate material into a strip shape as is clear from FIGS. 1 and 3.
It is arranged so as to traverse the supply passage 6. Control member 1
Guide case 38 for accommodating 8 in a freely retractable state
Is welded to the component supply pipe 8, and the restricting member 18 can be advanced and retracted in a state where the restricting member 18 fits snugly inside the guide case 38. Reference numeral 19 is a guide case 3.
8 shows a guide hole formed in the inside. Regulation member 18
Has a portion that forms a stopper surface 39, and as is clear from FIG. 3, both left and right sides of the stopper surface 39 are supported by the guide case 38. When the left and right ends of the regulating member 18 are supported by the guide case 38 as viewed in the cross-sectional direction of FIG. 1, more stable support can be obtained in addition to the above-described left and right support of the stopper surface. A passage hole 40 for a component is formed next to the stopper surface 39, and the regulation member 18
Is slid, and when the passage hole 40 is aligned with the supply passage 6, the passage of the carrier air is allowed and the passage of the component 1 is also allowed. An air cylinder 20 is installed for advancing and retracting the regulating member 18, which is fixed to a bracket 21 welded to the guide tube 9, and a piston rod 22 thereof is coupled to the regulating member 18. An elongated notch 23 for allowing the shaft 2 to pass is provided in the lower portion of the component supply pipe 8.

In this embodiment, the component 1 is supplied to the movable electrode 24 of the projection welder,
A receiving hole 25 of the shaft portion 2 is opened in the electrode 24, and a fall prevention magnet 26 is fitted in the back of the receiving hole 25. The fixed electrode 27 forms a pair with the movable electrode 24, on which the steel plate part 28
Is posted. Since the magnetic field is formed around the movable electrode 24 when the movable electrode 24 is descending and the welding current is flowing, the position of the component 1 should not be deviated thereby, so that the shield member 29 is installed. The shielding member 29 is
As is clear from FIGS. 1, 3 and 5, it is composed of a plate-shaped iron member, and the piston rod 31 of the air cylinder 30 is coupled to perform forward / backward movement.
The shielding member 29 is in a state of closing the notch 23 and in a state of covering the tip end side of the supply rod 10, and is installed in a retractable state on the advancing side of the component and the supply rod. The air cylinder 30 is fixed to a bracket 32 welded to the component supply pipe 8 and the guide pipe 9.

Next, the operation will be described. In FIG. 1 and FIG. 3, the component 1 is stopped on the stopper surface 39, but in the following description, the component 1 does not exist in this way. . The parts are delivered one by one from the parts feeder 5, and the power for carrying the parts 1 is jetting of compressed air. Such a carrying method is well known and is not shown. First, the restriction member 18 has its passage hole 40 aligned with the supply passage 6 to allow the flow of the carrier air. By the time the component 1 approaches the restriction member 18, the air cylinder 20 is actuated to move the air as shown in FIG. The stopper surface 39 is returned to the position shown by the solid line and is in a state of waiting for the arrival of the component. Here, when the component 1 is sent at high speed, it is received by the flat stopper surface 39, and the state shown by the solid line in FIGS. 1 and 3 is obtained. Next, when the restricting member 18 is retracted, the component 1 falls through the passage hole 40 while being attracted by the magnet 15 and stops at the position shown by the chain double-dashed line in FIGS. 1 and 3.
Components are held at the tip of the supply rod 10, in other words, at the end of the supply passage 6. Then, after the shielding member 29 is retracted, the supply rod 10 is stopped at the position shown by the chain double-dashed line in FIG. 1, that is, at the position where the shaft portion 2 of the component and the receiving hole 25 of the movable electrode are coaxial with each other. When the movable electrode 24 descends into the receiving hole 25 and the supply rod 10 retracts at the same time, the projection 4 slides on the protective plate 16 and the flange 3 comes out of the recess 13. This time, the shaft portion 2 is attracted by the magnet 26 and the movable electrode 24
Will be held to the side. Then, when the movable electrode 24 descends as it is and the projection 4 is pressed against the steel plate component 28 to be energized, the projection 4 is melted and welding to the steel plate component 28 is completed, and the movable electrode 24 leaves the component 1. Move back to the original position. When a welding current is applied to the movable electrode 24, the shielding member 29 is closed and the next component is pulled out by the magnetic force during energization, or spatter that scatters during welding is supplied to the supply rod 10.
To prevent it from entering the sliding gap part.

In order to obtain the above-described operation sequence, air supply / discharge to / from each air cylinder may be performed by an electric control valve, which can be easily carried out by a normal sequence control. The description is omitted.

The embodiment shown in FIG. 6 is a modified example of the regulating member, in which a small-diameter vent hole 41 is opened at the position of the stopper surface 39, whereby the stopper surface 39 is positioned in the supply passage 6 from the beginning. You can keep it.

The embodiment shown in FIG. 7 is also a modification of the regulating member, in which the passage hole 40 as described above is stopped. Therefore, the stopper surface 39 is supported by the guide holes 19 on both sides thereof. In order to allow the carrier air to pass therethrough, it is advisable to partially retract the supply passage 6 by retracting the regulating member 18 partway.

Next, the embodiment of FIGS. 8 and 9 will be described. This is the case where it is applied to stud welding, and the component 1 has the same shaft portion 2, flange 3 and projection 4 for welding as those described above.
The supply passage 6, the component supply pipe 8, the restricting member 18, the air cylinder 20, the bracket 21, and the like are exactly the same as in the previous embodiment. The component supply pipe 8 is connected to and communicates with the operating pipe 33.
A mechanism 34 for elastically holding the component is installed at the tip of the as a component holding means. This will be described in detail with reference to FIG. 9. An elastic collet 35 forming the mechanism 34 is joined to the actuating tube 33. The elastic collet 35 has an annular base portion 3.
Six to three or four elastic legs 37 extend from each leg, and the legs 37 have a smaller distance from each other toward the tip.
The structures for the steel plate parts and the shielding gas of the other party are not shown. Further, the regulation member 18 is installed at a position relatively close to the elastic collet 35 as shown in FIG.

Explaining the operation of this embodiment, the ON / OFF control of the passage of parts by the regulating member 18 is the same as in the previous embodiment. The component 1 descending from the restricting member 18 advances while the flange 3 pushes and spreads the elastic leg 37, and at the moment when the flange 3 passes through the elastic leg 37, the elastic leg 37 nips the shaft portion 2 properly and as shown in FIG. That's all. After that, the entire working tube 33 descends and stud welding is performed on the steel plate component.

[0015]

According to the present invention, since the regulating member is supported on both sides of the stopper surface, it is possible to disperse and receive the impact force of the component, and therefore, the so-called rattling and the like as described in the prior art. It can prevent malfunction. Since the stopper surface can be formed flat,
The parts can be received with high stability. By installing the passage holes as shown in FIGS. 3 and 4, it is possible to circulate the carrier air and reliably move the components. Further, as shown in FIG. 6, by forming a small-diameter vent hole at the stopper surface, it is possible to allow the carrier air to flow from the beginning with the stopper surface in the standby position.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view showing the entire apparatus.

FIG. 2 is a plan view of a supply rod.

FIG. 3 is a front view of the entire apparatus.

4 is a sectional view taken along line (4)-(4) of FIG.

5 is a sectional view taken along line (5)-(5) of FIG.

FIG. 6 is a vertical sectional side view showing a modified example of the restriction member.

FIG. 7 is a vertical sectional side view showing a modified example of the regulating member.

FIG. 8 is a vertical sectional side view when applied to stud welding.

FIG. 9 is a vertical sectional side view of an elastic collet.

[Explanation of symbols]

 6 Supply Passages 7 and 34 Component Holding Means 17 Means for Temporarily Stopping Components 18 Restricting Member 39 Stopper Surface 10 Supply Rod 29 Shielding Member 34 Mechanism for Elastically Retaining Components

Claims (3)

[Claims] 1. A means for temporarily stopping a component in a supply passage at a position separated from the supply passage by a required distance in a type in which a component holding means is provided at the end of the supply passage,
A supply speed control device for a component, wherein the means for temporarily stopping the component is composed of a retractable regulating member that traverses the supply passage, and the regulating member is supported on both sides of the stopper surface. 2. A component feeding speed according to claim 1, wherein the component holding means is formed on the advancing / retreating supply rod, and a shielding member capable of advancing / retreating is installed on the advancing side of the component and the supply rod. Control device. 3. The component supply speed control device according to claim 1, wherein the component holding means is a mechanism for elastically holding the component of the stud welding device.