JPH0315270Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a welding process in which a large number of parts fed through a chute are simultaneously separated and fed to a plurality of parts supply heads installed in a spot welding machine. This invention relates to a device for separating supplied parts.

(Prior art and its problems) Conventionally, when welding nuts that are aligned and fed from a parts sorter through a chute are fed to multiple electrodes in a spot welding machine, generally the nuts are fed through a chute. In many cases, a so-called weld nut separating device is used, which separates weld nuts one by one at their terminal ends and transfers them to a nut supply head via a nut supply pipe.

FIG. 1 shows a typical example of the weld nut separating device.

This welding nut separation device 1 includes a nut feeding rod 2
A chute that intersects and communicates with the guide passage 3 is attached to the selector main body 4 which has a guide passage 3, and a nut drop groove is provided at the tip of the feed rod 2 to receive only the leading welding nut at a position intersecting with the chute 5. 6
is provided so that the welding nuts fed into the groove can be fed alternately into the two nut feeding ports 7 and 8 that intersect the passage by forward and backward movement of the nut feeding rod. .

However, this type of conventional device separates the welding nuts sent from the chute one by one into two nut feeding ports by alternately operating two cylinders 9 and 9' connected in series. Therefore, when welding two points at the same time, the two welding nuts cannot be fed to their respective fixed positions without reciprocating the nut feed rod twice.
Welding had to be started after the last welding nut had been supplied, which had the disadvantage that it was difficult for producers to improve their performance. Furthermore, connecting two cylinders in series itself has the disadvantage that the structure becomes complicated and large, resulting in disadvantages in terms of cost and space.

FIG. 2 shows an example of another conventional device.

This type of conventional device has two components in one parts sorter 9.
According to this device, a welding nut separation device 1, 1' which connects the welding nuts fed in alignment through each chute 5, 5' to the terminal end of each chute 1, 1' It is advantageous over the system shown in FIG. 1 in that it can be simultaneously separated from the air and sent to two locations at once. However, the drawbacks of this device are that this type of so-called two-barrel parts feeder is generally complicated and expensive, and in addition, each chute 5, 5' has a nut separating device 1,
1', the problem was that the structure was complicated and the cost was high.

(Purpose of the present invention) Therefore, in order to eliminate the above-mentioned drawbacks, the present device has a parts feed rod that passes through the guide path of the selector body in order to feed multiple parts aligned and fed from the parts sorter through one chute. Separates and supplies multiple parts to multiple positions at the same time by just reciprocating, speeds up separation and supply of multiple parts, and greatly contributes to improving spot welding productivity, simplifying the structure of separating equipment, and reducing costs. The main purpose is to

(Summary of the present invention) The present invention consists of a chute that aligns and sends out parts from a parts sorter, a stopper device that separates the aligned parts into multiple units in the middle of the chute, and a guide passage that communicates from a direction across the chute. The selector body has a selector body, a parts feed rod that moves forward and backward through a guide passage of the selector body, and a drive source therefor, and among the plurality of parts separated by the stopper device, the parts are fed from the chute into the guide passage. The first part that comes in is received by the tip of the above-mentioned feed rod, and
When the next part is moved forward, the feed rod is shifted within the guide path so that the feed rod passes through the rod as it is, so that multiple parts are simultaneously communicated with the guide path. It is characterized by being separately supplied to the supply port.

(Embodiments of the present invention) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a schematic explanatory diagram showing the entire case where the supplied parts separating device according to the present invention is applied to a welding nut supplying device of a spot welding machine.

In this embodiment, the welding nut supply device includes a parts sorter 10 having a vibrating ball 9 into which welding nuts are fed, and a chute 5 which aligns and feeds the welding nuts sent out from the vibrating ball 9 to the outside. , a stopper device 11 separates the welding nuts two by two in the middle of this chute, and a stopper device 11 separates the welding nuts two by two in the middle of this chute, and the welding nuts separated two by two are then simultaneously connected to each nut supply pipe 1.
2, 12', a welding nut separating device 1,
A welding nut supply head 15 having spindles 14, 14' which advance and feed the welding nuts fed through the supply pipes 12, 12' from the received position to the respective pilot pins P ₁ , P ₂ of the back electrode 13. , 15'.

The spot welding machine 16 has two welding guns G ₁ and G ₂ for series welding, a back electrode 13 facing the electrodes E ₁ and E ₂ of each welding gun, and a back electrode 13 that protrudes and retracts from the electrode surface corresponding to each electrode. two pilot pins P ₁ ,
P ₂ , and the welding nut supplied from each welding nut supply head 15 , 15' to each pilot pin P ₁ , P ₂ is applied to the plate 17 to be welded into which this pilot pin is inserted and fixed in position on the electrode surface. Weld nuts N ₁ and N ₂ at the same time.

Next, the stopper device 11 functions as a kind of separating device that separates the group of welding nuts that have been fed in alignment from the vibrating ball 9 through the chute 5, two at a time, and sends them out.

FIG. 4 is an explanatory diagram showing the structure and operation of the stopper device.

The stopper device 11 includes two cylinders 20 and 21 supported by a bracket 29 and an air nozzle 24, and a spring 22 installed inside one of the cylinders 20 is moved in the direction in which the piston rod 18 is inserted into the chute 5 ( The spring 23 installed inside the other cylinder 21 applies a spring force in the direction (b) to pull up the piston rod 19 from within the chute. These two cylinders 20, 21 are operated simultaneously by one solenoid valve, and two piston rods 18, 19 are operated simultaneously.
By alternately inserting and removing the nuts into and out of the chute, the alignment nuts in the chute are separated two by two, and
The separated welding nuts N ₁ and N ₂ are passed through the air nozzle 24.
Welding nut separation device 1 using compressed air spouted from
Transfer to.

FIG. 5 is a sectional view of a main part showing an example of the configuration and operation of the separating device of the present invention using a welding nut as a supply part.

The selector body 26 and the chute 5 are fixed at a substantially right angle, and the guide passage 27 in the selector body and the guide passage 28 of the chute 5 intersect and communicate with each other. In the guide passage 27 of the selector body 26,
A component feed rod 2 of a predetermined size is inserted, and the component feed rod 2 is shifted in the left-right direction in the passage 27 by a cylinder 31 fixed to a support plate 30 of the mounting plate 29'. The selector body 26 includes a component supply port 32 that corresponds to the direction in which the guide passage 28 of the chute 5 extends and communicates with the passage 27 at right angles, and a component supply port 33 that communicates in the forward direction of the passage 27.
and is provided.

FIG. 6 shows the structure of the parts feeding rod 2.

The component feed rod 2 is a rod-shaped rod with a square cross section that fits into the guide passage 28 of the selector main body 26, and has a component feed groove 34 and a component drop groove 35 bored in its tip and middle portions. The feed groove 34 is
Guide passage 27 from chute 5 to selector body 26
Among the specified number of welding nuts N ₁ and N ₂ sent inside, the leading welding nut N ₁ is received on the receiving bottom plate 34a at the retracted position of the feeding rod 2. Further, the drop groove 35 allows the next welding nut N ₂ waiting in the chute to drop directly into the component supply port 32 at the forward position of the feed rod. Air nozzles 36 and 37 are provided in the guide passage 28 of the selector body to blow off each welding nut N ₁ and N ₂ several meters when the feed rod moves forward.

In addition, the welding nut supply head 15 shown in FIG.
15' is installed at similar angles to the respective welding guns G ₁ and G ₂ . Nut supply pipe 1 connected to each component supply port 32, 33 of the separation device 1
2, 12' are connected to nut stops 25, 25' of each supply head 15, 15', respectively.
The spindle 14, 14' of each supply head is advanced by means of a respective cylinder 26' over the nut stop 25, 25' towards the pilot pin P ₁ , P ₂ , during which time a magnetic circuit is formed on the spindle. The structure is such that the welding nut can be supplied to the pilot pin by the suction force that acts and its release.

Next, the operation of the present invention will be explained.

A large number of welding nuts placed in the ball 9 of the parts sorter 10 are fed in alignment through the chute 5 by vibrations applied to the ball. The group of welding nuts sent out from the chute 5 is
Two pieces are separated by the operation of the stopper device 11 shown in B. The two weld nuts N ₁ and N ₂ separated by this stopper device 11 are fed to the next weld nut separation device 1 . Of the two weld nuts sent to the weld nut separation device 1, the first weld nut _N1 is directly fed to the feed groove 34 of the nut feed rod 2 that is waiting in the retreat position, and is received there. . The next welding nut N ₂ then stops in the chute so as to overlap on top of the first welding nut N ₂ .

Next, the cylinder 31 operates and the nut feed rod 2
By moving forward to the left, the first welding nut N ₁ is transferred to the nut supply port 33 , and at the same time, the nut drop groove 35 of the nut feed rod 2 communicates between the guide passage 28 of the chute 5 and the nut supply port 32 . As a result, the next welding nut N ₂ falls directly into the nut drop groove 35 and is supplied to the nut supply port 32, and the welding nuts N ₁ and N ₂ separated and supplied to each nut supply port 32 and 33 are , air nozzle 3
The compressed air injected from 6, 37 is sent into the nut supply heads 15, 15' through the nut supply pipes 12, 12'. Welding nuts N ₁ , N ₂ fed to each nut supply head 15, 15'
are received in the nut stops 25, 25'. Then, the spindles 14, 1 are inserted from above the nut stops 25, 25' by each cylinder 26'.
4' moves forward toward the pilot pins P ₁ and P ₂ , the spindle is magnetized by the magnetic field of the permanent magnet (not shown) provided above the nut stop parts 25 and 25', and the attraction force that acts on this spindle. Attach the welding nut to the pilot pins P ₁ and P ₂ as they are.
When the welding nut is brought to the top and the magnetic force of the spindles 14, 14' is lost, the welding nut is released from the tip of the spindle, and the inner diameter of the nut is fitted into the pilot pin to complete the supply.

After the two welding nuts are supplied at the same time, the two welding nuts _N1 and _N2 are serially welded to the plate 17 by applying pressure and electricity using the two welding guns _G1 and _G2 .

(Effects of the present invention) As described above, according to the present invention, when a plurality of small parts to be welded, such as a welding nut, are fed to a spot welding machine using a parts feeder for welding, the parts sorter Among the plurality of parts that are separated and sent in specified numbers through one chute from When the feed rod is moved forward, the next part is passed through the part groove provided in the feed rod, so multiple cylinders are operated alternately as in the conventional method. Compared to single-separation devices or complicated/expensive double-parts feeders, multiple parts can be separated and fed simultaneously with one movement of the feed rod using a single drive source, and its structure is also unique. Since each groove is simply formed on the part feed rod, conventional equipment can be easily modified, which can lead to separation of multiple parts, faster supply, improved productivity and lower costs for spot welding. be effective.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an example of a conventional component separation device, including a cross section of a main part. FIG. 2 is a plan view, with some parts removed, of a conventional device using a dual parts feeder. Third
The figure is an explanatory diagram schematically showing an example of the application of the device of the present invention. FIGS. 4A and 4B are sectional views showing the structure and operation of the stopper device. 5A and 5B are sectional views of main parts showing the structure and operation of the component separating device according to the present invention. 6th
Drawings A and B are a plan view and a BB sectional view showing the structure of a parts feeding rod. 1...Supplied parts separation device, 2...Parts feeding rod,
5... Shoot, 10... Parts sorter, 11...
Stopper device, 26...Selector body, 27,2
8... Guide passage, 31... Drive source, 32, 33...
...Parts feeding port, 34...Parts feed groove, 35...Parts dropping groove, _N1 , _N2 ...Parts (welding nut).

Claims (1)

[Scope of utility model registration request] A chute for aligning and sending out parts from a parts sorter, a stopper device for separating a group of aligned parts into a specified number in the middle of the chute, a selector body having a guide passage communicating from a direction across the chute, and the selector. The feed rod is equipped with a parts feed rod that moves forward and backward in the guide passage of the main body, and a drive source therefor, and the feed rod carries the first part of the group of parts sent from the chute into the guide passage in its retreated position. By drilling a component feed groove to receive the component and a component dropping groove to allow the next component to pass through at the forward position, and by shifting the feed rod within the guide path, multiple components can be communicated with the guide path at the same time. 1. A supplied parts separating device for a spot welding machine, characterized in that the parts are separated and supplied to a parts feeding port of a spot welding machine.