JPH1029071A - Automatic insert feed device for resistance spot welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically supply an insert material without using an another power source by converting advancing/retreating motion of an electrode into rotary motion with a cam mechanism and feeding an insert with using a roller rotated through a cam mechanism. SOLUTION: The feed devices 67a, 67b, at each welding, convert advancing/ retreating of electrodes 8, 9 for materials 101a, 101b to be welded into rotary motion with using a cam mechanism, rotate a pair of rollers 102a, 102b and feed insert materials 102a, 102b. The feed devices 67a, 67b have a cam mechanism for varying of spot interval and feed the insert material 102a, 102b at one timing for several times up/down motions of the electrodes 8, 9. Further, an uncoil looseness prevention mechanism arranged for reels 111a, 111b presses the surface of the insert material 102a, 102b and prevents uncoiled looseness. Slack is prevented by pressing the part, at which the insert materials 102a, 102b are made free, with the tip of slack prevention mechanisms 143a, 143b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert material in an electric resistance spot welding (hereinafter simply referred to as spot welding) for making indentation during welding less conspicuous between an electrode to be welded and a material to be welded. The present invention relates to a structure of an insert material supply device for supplying the material.

[0002]

2. Description of the Related Art A spot welding method has been widely used as a joining method in an assembling process in mass production of automobiles or the like using a conventional rolled steel sheet because of a very efficient welding method. This is because it is suitable for mass production, and once a welding condition is set, even a layman or a robot can easily perform welding and obtain a stable welding nugget and joint strength.

[0003] The spot welding method is used not only for rolled steel sheets but also for spot welding aluminum and its alloys and Zn-plated steel sheets. In this case, the first or second type of JISZ3234 “Copper electrode material for resistance welding” is used as the electrode material, and the electrode shape is
It is common to use one having a shape determined by JISC9304 “Shape and dimensions of spot welding electrode”.

The reason why these materials are used as electrode materials is that they have higher thermal conductivity and electric conductivity than the material to be welded, so that the electrode and the material to be welded are less likely to be joined at the contact portion.
This is because welding can be performed continuously. At this time, the number of welding points that can be continuously welded, that is, the electrode life, differs depending on the type of the material to be welded.

[0005] The electrode life of an electrode is related to a process called dressing. That is, the tip of the electrode is cut into a predetermined shape before welding or polished to a predetermined surface roughness to prepare the electrode. This is called dressing. The number of hit points at which a weld having the required performance is continuously obtained by one dressing is referred to as the electrode life of the electrode.

[0006] (1) The number of continuous hits until the nugget diameter or the tensile shear strength becomes equal to or less than a specified value. (2) An alloy layer of the electrode and the material to be welded is formed at the tip of the electrode. The phenomenon in which the appearance is impaired by being transferred to the surface is referred to as pickup, but the number of continuous hit points before this occurs,
(3) The number of continuous hits before the phenomenon in which the electrode is welded to the material to be welded and cannot be removed occurs.

Generally, the method (1) is often used. It is said that the electrode life of spot welding on an assembly line of an automobile using a conventional rolled steel sheet by this determination method is 10,000 points or more. As described above, spot welding of a rolled steel sheet has a very long electrode life.On the other hand, the electrode life of aluminum or an aluminum alloy spot welding is said to be 200 to 500 points, and in the case of a Zn-plated steel sheet, 1000-20
It is said that the 00 point is the electrode life.

In the automobile industry, since rolled steel sheets have poor corrosion resistance, recently, plated steel sheets having improved corrosion resistance and paintability by plating steel sheets with Zn or a Zn alloy have come to be used. When this plated steel sheet is subjected to resistance spot welding, heat generated between the electrode and the plated steel sheet causes Zn or Zn.
Since the alloy has a low melting point, it elutes and welds to the electrode, and since the copper or copper alloy as the electrode easily alloys with these metals, an alloy layer of copper and the material to be welded is formed at the electrode tip, which is welded. Pickup that sometimes adheres to the material surface or is stamped and the indentation of the weld is very dirty ((2) above)
Occurs.

Further, since the alloy layer is successively transferred to the welding surface of the material to be welded, the electrodes are consumed. In particular, since the electrode central part is greatly consumed, the electrode tip becomes concave, and accordingly, the nugget diameter and tensile shear strength of the welded part decrease (the above (1)), and the electrode life is reduced to 1000 to 2000 points. Will drop.

When the electrode is cut or polished and the tip shape is again formed into a regular shape (dressing), welding becomes possible again, and the nugget diameter and the tensile shear strength are restored to the original values. Therefore, when spot welding a Zn-plated steel sheet or the like, dressing must be performed more frequently than when a rolled steel sheet is used. Because of the time and expense involved,
The welding cost of the Zn-plated steel sheet is not only higher than the welding of the rolled steel sheet, but also has a problem in that the production capacity is reduced.

On the other hand, the use of aluminum and aluminum alloys as automotive materials is increasing. This is because the energy saving of automobiles is progressing in order to prevent global warming, and it is said that reducing the body weight by 10% can save about 10% of energy. This is because alloys are receiving attention.

Although the melting point of aluminum and aluminum alloy is about 1/2 or less of that of a rolled steel sheet, since the thermal conductivity and the electrical conductivity are about three times that of a rolled steel sheet, the melting point of the aluminum and aluminum alloy is higher than when welding a rolled steel sheet. Weld in a short time.
Furthermore, on the surface of aluminum and an aluminum alloy, an oxide film having an insulating property and a high melting point is formed with a thickness of several tens to several hundreds of micrometers, and this spot has a great effect on spot welding. .

For example, in spot welding, when an electric current flows when an electrode comes into contact with a material, heat is increased due to an insulating film between the electrode and the material, and the electrode itself is heated or the electrode and the material are heated. The alloy is alloyed, and the electrodes are consumed in a system similar to the spot welding of the plated steel sheet described above. Therefore, the electrode life of aluminum and aluminum alloy is 2
It is said to be between 00 and 500 points. With such a short electrode life, dressing of the electrode becomes very frequent, and this is a problem in mass production of automobiles and the like, which is a problem.

As described above, in the electrode, the electrode and the material to be welded form an alloy layer, which is transferred and transferred to the welded portion, the electrode is consumed, the tip shape changes, and the current density and contact of the welded portion are changed. Due to the change in resistance, the production of the weld nugget changes to form a nugget diameter smaller than the standard, and the life is reached. In addition, since the tip of the electrode is deformed, ugly indentation marks are generated on the surface of the material to be welded during welding.

Since the electrode life in spot welding of a Zn-plated steel sheet or an aluminum alloy is extremely inferior to that of a rolled steel sheet as described above, many studies have been made on methods for improving the electrode life. For example, as a method of improving the electrode life most in aluminum alloy spot welding, there is a report that if a chromium copper electrode is processed into a projection shape (pimple shape) and welded, the electrode life is improved to about 6000 points. However, the electrode life of 10,000 or more points of the rolled steel sheet is not reached.

As a method of dramatically improving the electrode life, welding is performed between an electrode and a material to be welded via an insert material (also referred to as a metal tape, a metal foil, a conductive tape, a metal inclusion, or a metal piece). Methods have been considered previously.
For example, JP-B-44-24733, JP-B-49-230
91, JP-B-49-36860, JP-B-49-4521
1, JP-A-50-152947, JP-A-53-7275
1, JP-A-54-76455, JP-A-57-1739
0, JP-A-57-56175, JP-B-58-4195
0, JP-A-61-159288, JP-B-62-5171
0, Japanese Unexamined Patent Publication No.
3, JP-A-64-83380, JP-A-64-8338
2, Japanese Utility Model Laid-Open No. 3-116276, JP-A-4-322886
Etc. Some of these patents disclose a method and apparatus for intermittently supplying conductive tape.

[0017]

However, in all of these methods and apparatuses, since the supply of the insert material uses a power source such as electricity or air separately, the structure of the entire apparatus becomes complicated and the apparatus is relatively large. I had to become. For this reason, not only is the device expensive, but also because wiring and piping are present around the supply device, there have been problems such as being wound around the machine and making it difficult to weld a narrow portion when robotized.

An object of the present invention is to provide a wrought aluminum and aluminum alloy, a metal-plated steel sheet (for example, Zn, Zn
In the case of spot welding in which an insert material is intermittently supplied between an electrode and a material to be welded, and welding is performed through the insert material, a resistance welding method for metal such as alloy plating, Sn, and Sn alloy plating is used. An object of the present invention is to provide an automatic spot feeder for spot welding that can automatically supply a material without using a power source such as electricity, air, or hydraulic pressure.

[0019]

To achieve the above object, the following invention is provided. A first invention provides an electrode (8)
When the material to be welded (101) is pressurized and energized through the tape-shaped conductive insert material (102) due to the forward and backward movement of the electrode to perform electric resistance spot welding, the timing of the forward and backward movement of the electrode is adjusted. A cam mechanism (see FIG. 6) for intermittently and automatically feeding an insert material between an electrode and a material to be welded; A pair of rollers (15, 3) that rotate by the rotation of the cam mechanism and feed the insert material while the material is held therebetween.
2) An automatic insert supply device for spot welding, comprising:

According to a second aspect of the present invention, the cam mechanism is provided on the electrode side via a spring (65), so that the frame (F) is stopped by being pressed by the material to be welded as the electrode advances, and the frame (F). The feed pawl (3
9), the teeth which are engaged with the feed pawl are formed and provided directly on the electrode side, so that the engagement advances as the electrode advances and the engagement slides, and as the electrode retreats, the engagement retreats and the rotation is performed. Ratchet gear feed cam (1
4), the pair of rollers being a feed roller (15) fixed coaxially to the feed cam, and a press roller (32) for holding the insert material between the feed roller and the feed roller. And an automatic insert feeder for spot welding.

According to a third aspect of the present invention, there is provided a cam mechanism for changing the interval between the spot welding spots on the insert material by feeding the insert material in accordance with several forward and backward timings of the electrode (see FIG. 9). An automatic insert feeder for spot welding, comprising:

According to a fourth aspect of the present invention, the hit point interval changing cam mechanism includes a plurality of hit point interval changing cams (16, 17, 18) provided coaxially with the feed cam. Grooves provided at different intervals for each cam, the mounting position is changed so as to be fitted integrally with the feed pawl and engage with any of the plurality of hit point interval changing cams, and fall into the groove. An automatic spot feeder for spot welding, comprising: a hitting interval changing pawl (44), the dimensions of which are set so that the engagement of the feed pawl is allowed only in a state where the feed pawl is engaged.

According to a fifth aspect of the present invention, spot welding is performed by applying pressure to a material to be welded through a tape-shaped conductive insert material (217) by advancing and retracting the electrode, and adjusting the timing of the advance and retreat of the electrode. An automatic insert supply device for automatically and intermittently supplying an insert material between an electrode and a material to be welded; a cam mechanism (see FIG. 11) for changing a forward / backward movement of the electrode into a rotational movement; A take-up reel (212) that rotates by the rotational motion of the cam mechanism and feeds the insert material while the material (217) is wound therearound.

According to a sixth aspect of the present invention, in the cam mechanism, the electrode (8) is guided by a frame (161) provided on the electrode side and the frame through long guide holes (180, 181). The support leg (205) is stopped by being pressed by the material to be welded (101) with the forward movement of the workpiece, a feed pawl (189) provided on the frame side, and teeth meshing with the feed pawl are formed. And a ratchet gear-shaped take-up cam (183), which is provided directly so that the meshing slips with the advance of the electrode and the meshing and rotation is performed with the retreat of the electrode. It is an automatic insert feeder for spot welding.

According to a seventh aspect of the present invention, there is provided a cam mechanism for changing the interval between spot welding points on the insert material by winding the insert material in accordance with the timing of forward and backward movement of the electrode several times. An automatic insert feeder for spot welding.

According to an eighth aspect of the present invention, the hit point interval changing cam mechanism includes a plurality of hit point interval changing cams provided coaxially with the take-up cam, at different intervals for each of the hit point interval changing cams. A groove provided, the mounting position is changed so as to be integrated with the feed pawl, and the mounting position is changed so as to mesh with an arbitrary one of the plurality of hit point interval changing cams. An automatic spot feeder for spot welding, comprising: a nail for changing a hit point interval, the dimensions of which are set so that the nails can be engaged.

According to a ninth aspect of the present invention, there is provided an automatic spot welding mechanism comprising a slack preventing mechanism (143) for preventing a slack of the insert material supplied between the electrode and the material to be welded. It is an insert supply device.

In a tenth aspect, the slack preventing mechanism includes:
A roller (152) for contacting the free portion of the insert material with a small friction, and a spring (148) for urging the roller to move toward the insert material. It is an automatic insert feeder for spot welding. In this column, reference numerals and the like described in parentheses are for facilitating understanding of the technical content, and do not limit the technical scope at all.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be specifically described below. (Embodiment 1) (Schematic of Overall Configuration) FIG. 1 shows a case where an insert feeder according to Embodiment 1 of the present invention is attached to a normal stationary spot welding machine. In this stationary spot welding machine, generally, the upper part of the frame body 4a projects forward,
The frame lower base 4b protrudes forward from underneath, and the entire side surface is substantially U-shaped (FIG. 1B).

The pressure cylinder 2 mounted on the upper side of the U-shape is operated by the solenoid valve 1 to move the pressure ram 5 up and down. At the lower end of the pressure ram 5, an upper arm joint 6
The upper arm 7 is provided so as to be electrically connected to the current-carrying copper plate 12 a via the upper electrode 8 and supports the upper electrode 8.
Welding is performed by lowering and rising (forward and backward) of the upper electrode 8.

The lower side of the U-shape, that is, the lower frame 4
b, a lower arm 10 is provided via a lower arm joint 11 in a state of being electrically connected to the copper plate 12 b for energization, and supports the lower electrode 9. (In this specification, the suffix a of the reference sign means that the member is on the upper electrode side, and the suffix b means that the member is on the lower electrode side. In general, the suffix a is added. The member means that a similar member is also present on the lower electrode side.) The electrodes 8 and 9 are generally hollow and water-cooled, thereby cooling the heat generated by the electrodes due to welding.

The frame body 4a is provided with a controller 3 for setting and controlling welding conditions, a foot switch 13 for outputting a welding start signal, and the like, and a power transformer (rectifier in the case of rectification) not shown is incorporated therein. I have. The electrodes are generally hollow and water-cooled to cool the heat generated by the electrodes due to welding. As the type of the welding device, a single-phase AC welding machine, a single-phase rectifying welding machine, a three-phase rectifying welding machine, a three-phase low-frequency welding machine, an inverter DC welding machine, a condenser welding machine, and the like can be used.

In the case of the present embodiment, an insert supply device is provided in addition to the above configuration (FIG. 2). This insert supply device includes the electrodes 8 and 9 and the material to be welded 101.
a and an insert material 10 having conductivity between
2a and 102b are automatically supplied.
In this apparatus, a pair of upper and lower tape-shaped insert materials 102a, 102b are unwound from a pair of reels 111a, 111b, and a pair of support legs 8a.
6a, 86b, which are held through the tips of
After approaching 1a and 101b and further passing under the electrodes 8 and 9, it is sent while being held through the tips of the feeders 67a and 67b.

The insert material is copper and copper alloy or iron,
Metals such as nickel, titanium, chromium, silver, and gold, or conductive metals such as alloys thereof and carbon, carbon compounds, conductive substances such as carbon mixtures alone, or one of the conductive materials as a core material, A laminated material or a composite material using a seed as a skin material, or a material obtained by electrically or chemically plating another type can be used. The thickness of the insert material is suitably about 10 μm to 1 mm,
The width is related to the contact diameter of the tip of the electrode, and is suitably about 5 to 30 mm.

The feeders 67a and 67b convert the relative vertical movement (forward / backward) of the electrodes 8 and 9 with respect to the materials to be welded 101a and 101b, which is performed each time of welding, into rotary motion using a cam mechanism. The rollers 15a, 32a are rotated to feed the insert materials 102a, 102b. Each of the feeders 67a and 67b has a cam mechanism for changing the interval between hit points. The hit point interval changing cam mechanism has a configuration in which the insert materials 102a and 102b are sent at a timing once every several vertical movements of the electrodes 8 and 9.

The reels 111a and 111b are provided with insert material unraveling prevention mechanisms 123a and 123b, and the tips of the winding unraveling prevention mechanisms 123a and 123b are inserted into the reels 111a and 111b. Has a structure that presses the surface to prevent unraveling. Also, the reels 111a,
For the insert materials 102a and 102b which are unwound from the 111b and become free, the slack preventing mechanisms 143a and 143b are provided, and the slack preventing mechanisms 143 are provided.
a, 143b are inserted into the inserts 102a, 102
The structure is such that the free portion b is pressed.

The main part of the insert supply device is made of metal, synthetic resin, ceramics, etc., and has sufficient strength and durability to withstand continuous use. I do. In addition, if the electrode is directly attached to the electrode, it is not desirable that the electrode is conductive because it shunts the welding current, and therefore, synthetic resin, ceramics, or the like is used as the material.

(Overview of the overall operation) In actual welding, first, insert materials 102a,
102b is pulled out, and the tips of the support legs 86a, 86b,
And after setting through the leading ends of the feeders 67a, 67b, the welding conditions (squeeze time, up slope, energizing time, holding time, welding current, etc.) are set by the controller 3,
The pressing force is set by a pressure setting device of the pressurizing cylinder 2.

Then, the two materials 10 to be welded are to be welded.
1a and 101b are overlapped, and both insert materials 102
a, 102b, the foot switch 13 is depressed to input a signal for starting welding, and the solenoid valve 1 is operated. Then, the air pressurizing cylinder 2 operates, the pressurizing ram 5 moves down, and the upper arm joint 6, the upper arm 7, the upper electrode 8, the support leg 86a, and the feeder 67a also move down and move forward.

Then, between the supporting legs 86a and 86b and between the feeding devices 67a and 67b, the material to be welded 101 is provided.
a and 101b are sandwiched. Thereby, the material to be welded 101
a, 101b, and the insert material 102a,
102b is held. The tips of the electrodes 8 and 9 are
Since it is set farther from the material to be welded than 6a, 86b and the feeding devices 67a, 67b, it has not yet contacted the material to be welded 101a, 101b at that time.

Further, the pressure ram 5 continues to descend. The electrode tip of the upper electrode 8 and the lower electrode 9 is the insert material 1
02a, 102b through the materials to be welded 101a, 101b
b is pressurized, and when the pressure reaches a predetermined pressure, power is supplied to perform welding.

After the welding, the electrodes 8 and 9 are inserted into the inserts 102a and 102b and the materials 101a and 101 to be welded.
b, the pair of rollers 15a and 32a are rotated by the cam mechanism of the feeding devices 67a and 67b,
The inserts 102a and 102b are fed by a predetermined length. As described above, the insert members 102a and 102b can be supplied by using the forward and backward movements of the electrodes 8 and 9, and a separate motor or the like is not required.

At this time, the feeding devices 67a and 67b change the interval between the spots of spot welding by feeding the inserts 102a and 102b once every several vertical movements of the electrodes 8 and 9 by the mechanism for changing the interval between the spots. And insert material 10
The unnecessary consumption of 2a and 102b can be eliminated. Further, the insert materials 102a and 102b are provided with a pair of support legs 86a,
86b is held through the tip of
a, 67b are held through the tips of the supporting legs 8 even if they are slightly welded to the materials to be welded 101a, 101b.
When the materials 6a and 86b separate from the materials to be welded 101a and 101b, there is an effect that the insert materials 102a and 102b are pulled and peeled.

Similarly, the electrodes 8 and 9 correspond to the insert material 102.
Even if they are slightly welded to the electrodes a and 102b, they function to peel off the inserts 102a and 102b from the electrodes 8 and 9 when the electrodes 8 and 9 are retracted and retracted. Further, the insert material unraveling prevention mechanism 123a, 123b is provided for the insert material 1 wound around the reels 111a, 111b.
02a, 102b, the reels 111a, 1
11b prevents the inserts 102a, 102b from coming loose. Also, the slack prevention mechanisms 143a, 1
The tip of 43b presses the free portions of the inserts 102a, 102b to prevent the unwound inserts 102a, 102b from sagging.

(Detailed Description of the Structure of the Insert Material Supplying Apparatus) Next, each part of the insert material supplying apparatus will be described in detail. (Reel 111a) As shown in FIG.
Is attached to a mounting plate 103a fixed to the upper arm joint 6 by a fixing bracket 154. The reel 111b is attached to the lower arm joint 11 with the fixing bracket 1
It is attached to the attachment plate 103b fixed by 55.

Since the reels 111a and 111b are vertically symmetrically arranged and have the same configuration, only the upper reel 111a will be described below (note that the other parts are also arranged vertically symmetrically. Is
Only the upper part will be described).

As shown in FIG. 7, a reel mounting mandrel 110a is formed in a hole 104a formed in the mounting plate 103a.
Is fitted and fixed via a bearing 109a. The cross section of the mounting mandrel 110a has a shape having radial projections, and these projections enter the groove 112a formed at the center of the reel 111a around which the tape-shaped insert material 102a is wound, so that there is no play. It has become.

(Support Leg 86a) The support leg 86a is
Is attached by the attachment fitting 81a (FIGS. 3 and 5). That is, the mandrel 93a is disposed movably in the longitudinal direction within the box-shaped main body of the support leg 86a, and the spring 64a is passed through the upper end of the mandrel 93a protruding outside, and is housed in the mounting hole 82a.

Further, the upper end of the mandrel 93a passes through a small-diameter through hole formed in a not-shown partition formed in the middle of the mounting hole 82a in the longitudinal direction, and a bolt 66a is screwed through a washer 95a. Be included. Thus, the mandrel 93a is fixed to the mounting bracket 81a, and the main body of the support leg 86a is elastically mounted on the mounting bracket 81a via the spring 64a.

Therefore, when the upper electrode 8 is lowered (during welding), the supporting leg 86a is pressed by the material to be welded 101a and becomes shorter, and becomes longer when the upper electrode 8 is separated from the material to be welded 101a. A roller 90a is provided at the lower end of the support leg 86.
A mounting window 89a is formed through the mounting window 89a, and pin holes 8 formed on both inner side surfaces of the mounting window 89a.
7a and 88a are provided with a pin 91 serving as a rotation axis of the roller 90a.
a is fitted.

(Feeding Device 67a) The feeding device 67a has a cam mechanism for changing the vertical movement of the electrode 8 into a rotary motion, and a cam mechanism for changing the interval between hit points. The structure of both mechanisms is shown in FIGS.
A description will be given based on FIGS. 5 and 6 (particularly focusing on FIG. 5).
FIG. 5 is a perspective view of components of the insert supply device. The frame Fa of the feeding device 67a is attached to the electrode 8 by the attachment fitting 77a. The mounting bracket 77a is provided with a mounting hole 80a for mounting the electrode 8 at the center, and is divided into two at the mounting hole 80a. A flange formed on the split part is fitted, a bolt 84a is passed through a bolt through hole 83a formed in the flange, and screwed into a nut 85a.

The mounting device 77a includes a feeder 67a.
A mounting hole 78a for mounting the frame Fa is formed, and a cylindrical portion formed on the upper part of the frame Fa is inserted. FIG. 5 shows a state in which the frame Fa has turned 90 degrees in this cylindrical portion. Frame F
a is a substantially box-shaped frame, in which a U-shaped mounting bracket 54a for mounting cams 14a, 16a, 17a, 18a and rollers 15a described later is disposed.

A mandrel 64a is provided integrally with the mounting bracket 54a, is inserted into a through hole 76a of the frame Fa, and passes through the inside of the cylindrical portion. Further, the spring 65a is passed through and housed in the mounting hole 78a. The mandrel 64a has a small-diameter through hole 79 formed in a partition formed in the middle of the mounting hole 78a in the longitudinal direction.
a, the bolt 66a is screwed into the end.

At this time, the holes 76a and 79a are made smaller than the diameter of the spring 65a so that the frame Fa
When the cylindrical portion is pushed into the hole 78a, the spring 65a is contracted. That is, frame F
a, 16a, 16a, 17a, 18a, roller 15
a, the mounting bracket 54, and the mandrel 64a descend.
Thereby, a relative movement occurs between the frame Fa and the cam 14a.

Shaft through-holes 55a and 56a are formed at both ends of the U-shaped mounting bracket 54a, and the bolt is screwed through a hole of the slider SLa which also serves as a stopper from the inside through which the shaft 53a is passed. Get mixed in. The cams 14a, 16a,
17a, 18a, roller 15a, and rotating bracket 34a
Is provided. That is, the rotating fitting 34a, the cam 14
a, roller 15a, cam 16a, cam 17a, 18a
Correspond to the respective shaft holes 57a, 58a, 59a, 6
0a, 61a, 62a, 63a, the shaft holes 55a, 56a
Attached to.

The feed cam 14a has a ratchet gear-like shape and has eight saw-like teeth. The feed cam 14a and the feed roller 15a are fixed to each other in such a manner that the pins 19 pass through the respective pin holes 20a and 21a so that they cannot rotate relative to each other. The cams 16a, 17a, 18a for adjusting the hit point interval are slightly smaller than the feed cam 14a. A cam 1 that feeds every eight-point welding
In 6a, small teeth are dug in seven places and deep grooves are dug in one place.

The cam 17a fed every four-point welding has small grooves in six places, but deep grooves in two places. And 2
The cam 18a sent for each spot welding has four small teeth,
There are deep trenches dug in places. Cam 16a, cam 17a,
The cams 18a are not connected to each other and are free from each other, and can freely rotate around the shaft 53a.
The feed cam 14a, the feed roller 15a, and the hit point interval adjusting cams 16a, 17a, 18a are all set in the rotating bracket 34a.

The rotating bracket 34a has a substantially rectangular frame shape in plan view, and a pair of shaft through holes 62a and 63a are provided at opposing portions of the frame shape. Further, pin holes 36a and 37a to which the pressing roller 32a is attached by the pins 33a are formed in opposing portions of the frame. A roller 31a for backing up the pressing roller 32a is attached to the support fitting 28a, and a hole 35a through which the male screw portion 27a formed integrally with the support fitting 28a passes is formed in the frame mold. The thumbscrew 25 is screwed into the male screw portion 27a passing through the hole 35a, and a support fitting 28a is attached.

The pawl 39a for moving the feed cam 14a is integrally attached to the pawl base 38a. This nail base 39a
The pin 48 allows the pin hole 49 of the rotating bracket 34a to be inserted.
a, 50a. The pin 48 is provided with a spring 47a, and forcibly presses the pawl base 38a against the cam 14a.

Further, another pawl 42 is provided on the pawl 38a.
a is attached. The pawl table 42a has a pawl 44a that meshes with the hit point interval adjusting cam 16a, 17a, or 18a to change the hit point interval. Claw stand 4
2a is slidably fitted in the groove 41a, and a screw 43a integrally provided on the back is screwed into the wing nut 25a via the washer 46a through the long hole 40a.

The connecting fitting 72a is connected to the rotating fitting 34a by passing the pin 48a of the rotating fitting 34a through the pin hole 73a at one end of the connecting fitting 72a. Also, a pin 97a that has passed through a pin hole 75a on the side surface of the frame Fa penetrates a pin hole 74a opened at the other end of the connection fitting 72a. As a result, the pawl base 38a, the pawl base 42, and the rotating fitting 34a are connected to the frame Fa via the connecting fitting 72a.

(Unwinding prevention mechanism 123a) Reel 1
Since the insert material 102a wound around 11a may be loosened as it is, FIGS.
The unraveling prevention mechanism 123a shown in FIG. That is, in the unraveling prevention mechanism 123a, the pressing roller 133a comes into contact with the insert material 102a wound around the reel 111a with small friction, and the spring 129a urges the pressing roller 133a toward the insert material 102a. Has a mechanism.

The details will be described below.
A female screw is formed in the mounting hole 107a drilled in a, and the rotating part 123a is mounted by a bolt 127a screwed into the female screw. That is, the rotating unit 1
A sleeve-shaped rotating mandrel 117a is inserted into a cylindrical rotating hole 125a formed in 23a, and the bolt 127a is inserted and attached to the rotating mandrel via a washer 126a. Rotating hole 125a of rotating part 123a
A position fixing component storage hole 124a for fixing the mounting position is formed from the outside toward the outside. A steel ball 122a is inserted into the position fixing storage hole 124a, and a spring 127a is inserted from above the hole 122a.
20a is screwed.

The steel ball 122a urged by the spring 121a in this way fits into the position fixing groove 118a formed in the rotary mandrel 121a and fits into the rotating portion 123a.
Is fixed in a predetermined posture position. At the same time, the steel ball 122a climbs over the position fixing groove 118a, and
23a is configured to be freely rotatable around the rotating mandrel 117a and to be able to release the pressing of the insert material.

A spring storing mandrel 128a is inserted inside the rotating portion 123a, and a spring 129a is arranged and stored on the outer periphery. The roller mounting column 130a is placed over the spring 129a, and is mounted on the spring housing mandrel 128a by a fixing screw 135a. In this state, the spring 129a is mounted on the roller mounting column 130.
a is urged forward (to the right in the figure). A pressing roller 133a is attached to the tip of the roller attachment column 130a. That is, the pressing roller 133a receives the pin 132a serving as a rotation shaft, and the pin 132a
Are fitted into the pin holes 131a to perform the mounting.

(Slack prevention mechanism 143a) The slack prevention mechanism contacts the free portion of the insert material 102a as shown in FIG.
The sag is removed by bending the feed path 2a.
This will be described in detail with reference to FIGS. Mounting plate 1
The bolt 139a inserted into the mounting hole 138a formed in the turntable 136a is screwed into the female screw of the mount hole 108a formed in the turntable 1a.
36a is fixed. Rotating mandrel 141a is attached to rotating mandrel mounting holes 137a formed in two parallel flanges of rotating table 136a.

The passage hole 1 through which the rotating shaft 141a passes
The slack preventing mechanism 143a having the rotary mandrel 45a
It is rotatably attached to the center 41a. The slack prevention mechanism 143a has a box shape, and a spring storage mandrel 147a is inserted from the front. A detachment prevention portion 146a formed at the rear end of the spring storage mandrel 147a fits inside the slack prevention mechanism. The screw 140a is screwed into the screw hole 142a formed on the rear side surface of the rotating mandrel 141a, so that the rotating mandrel 141a is prevented from coming off.

When the spring storage mandrel 147a is inserted, the roller mounting column 149a is placed over the stored spring 148a. Then, the mandrel fixing screw 153a is screwed into the spring storage mandrel 147a via the roller mounting column 149a. As a result, the roller mounting column 149a is mounted while being urged by the spring 148a.

At the end of the roller mounting column 149a, a slack adjusting roller 152a is penetrated by a pin 151a serving as a rotating shaft, and both ends of the pin 151a are fitted into a pin hole 150a to perform mounting. Mounting plate 10
3a, passing rollers 114a and 116a supporting the passing insert material 102a are provided with bearings 113, respectively, in order to bend the feed path of the insert material more efficiently.
It is attached by being inserted into the fixing holes 105a and 106a through the holes 115a and 115a.

(Reel Operation) The reel 111a stores the insert material 102a. Insert material 10
The unrolled end of 2a is lightly pulled by the rollers 15a and 32a, so that the insert 109a unwinds smoothly by the action of the bearing 109a. The reel 111a from which the insert material 102a has been unwound and emptied is removed from the reel mounting mandrel 110a, and a new reel 111a in which the next insert material 102a is wound is mounted on the reel mounting mandrel 110a.

(Operation of Support Leg) The support leg 86a is
Is lowered (at the time of welding), the spring 94a is pressed by the material to be welded 101a and contracts and shortens, and elastic pressing is performed. At this time, the insert material 102a is
The insert material 102a is held between the roller 90a at the tip of 6a and the inner and lower surfaces of the mounting window 89a, and is arranged close to the material to be welded 101a to prepare for welding. In addition, as in the case of the support leg 86a, the insert material 1
The feeding device 67a also has the function of holding the wire 02a through the tip and arranging it close to the material to be welded 101a. That is, the insert material 102a is also passed through and held by the grooves 68a and 69a at the tip of the feeder 67a.

When the insert material 102a is fed after welding, smooth feeding is performed by the action of the roller 90a. Even if the upper electrode 8 starts to retreat (rise) (FIG. 3 (A)
Of the insert material 10 held at the tip of the support leg 86a and the feeder 67a.
2a remains for a while close to the material to be welded 101a, and is peeled off from the upper electrode 8.

When the upper electrode 8 continues to retreat, the support leg 86a and the feeder 67a also start to retreat (up),
The insert material 102a held at the tip of the support leg 86a and the feeder 67a is lifted by the inner and lower surfaces of the mounting window 89a, and is peeled off from the material to be welded 101a. In this way, the support leg 86a is
plays a role in peeling a from the material to be welded 101a and the upper electrode 8.

(Detailed Description of Insert Material Feeding Operation by Cam Mechanism of Feeding Device 67a) The operation of the feeding device 67a feeding the insert material 102a by the cam mechanism using the vertical movement of the electrode 8 will be described mainly with reference to FIG. This will be described in detail.

(1) The electrode is at the upper stopping point, the spring 65a is fully extended, and there is no relative movement between the frame Fa of the feeder 67a and the shaft 53a. Therefore, the claw 38a and the connection fitting 7
2a is not in the shape of “ku” and is in a fully extended state. The feed pawl 39 is engaged with the lower tooth “A” of the feed cam 14a.

When the lowering of the electrodes starts and reaches the position (2), the frame Fa comes into contact with the material to be welded 101a and stops, and the shaft 53a continues to lower.
The relative movement between 3a begins. That is, if the upper electrode 8 continues to descend even after the frame Fa contacts the material to be welded 101a, the cylindrical portion of the stopped frame Fa (see FIG. 5) is attached to the fitting 77 of the upper electrode 8 which continues to descend.
The slider SL (see FIG. 5) at both ends of the shaft 53a that enters the mounting hole 78a of FIG.
a, slide 71a.

Then, the rotating bracket 34a having the rotating shaft 53a continuing to descend as the rotation axis of the stopped frame Fa is pulled through the connecting bracket 72a and slightly rotated. When the rotating fitting 34a rotates, the pawl 39a attached to the rotating fitting 34a
And the claw 38a rotates together. Therefore, the connection fitting 72
The letter “a” and the claw 38a are shaped like “ku”. At this time, the feed cam 14a in contact with the insert material 102a and the pressing roller 32a does not rotate, and the feed roller 15a integrated with the feed cam 14a and the other cams 16a, 17a, 18a do not rotate. Therefore, only the pawl 39a is connected to the feed cam 14a.
And moves to the higher tooth "B".

In other words, the stop pin 87 is attached to the frame Fa.
The connecting fitting 72a connected by a rotates the rotating fitting 34a and moves the pawl base 38a and the pawl 39a in the direction of the "B" tooth with the pin 48 as a fulcrum. When the upper electrode 8 further descends to reach the lower stopping point of (3), the angle of the “<” in the connecting metal fitting 72a and the pawl base 38a becomes larger. Then, the pawl 39a meshes with the tooth “B”. At this time, welding is performed.

When the welding is completed and the upper electrode 8 starts to rise,
When it comes to the position (4), the connecting bracket 72a and the pawl base 38a reduce the angle of the "<", and simultaneously, the pawl 39a.
Pushes down the tooth "B" of the meshed feed cam 14a and turns the feed cam 14a counterclockwise. Feed cam 14
The feed roller 15a integrally connected to the feed roller 15a is rotated. Therefore,
The feeding of the insert material 102a sandwiched between the roller 15a and the pressing roller 32a is started. The feed amount l is equal to the distance l around the outer circumference of the feed roller 15a.

As the electrodes rise, the connection fittings 72a
The nail base 38a makes the angle of the "" character smaller, and eventually returns to the fully extended state. Then, the pawl 39a rotates the feed cam 14a by one tooth, and when the upper electrode 8 reaches the upper stopping point (5), the feed of the insert material 102a is completed. That is, when the teeth of the feed cam 14a have rotated by one, the feed roller 15a has rotated by the outer peripheral length L, and the insert material 102a has been fed by the outer peripheral length L.

(Detailed description of the operation of the cam mechanism for changing the interval between the hitting points of the feeding device 67a) Based on FIG. 9, the cam mechanism for changing the interval between the hitting points of the feeding device 67a advances the upper electrode 8 one to eight times. Each time a spot (point) is welded 1 to 8 times by retreating, the insert material 102a is
Will be described in detail.

First, FIG. 9A shows a case where an insert material is fed point by point. That is, the feed pawl 39a is set so as to mesh with the feed cam 14a having eight teeth, and the hit point interval changing pawl 44a is used for the hit point interval changing cam 16a,
17a and 18a are set so as not to mesh with each other ((A) in FIG. 9A), and the feed cam pawl base 38a is set.
And the hitting interval changing claw 42a is fixed with the wing nut 45a. In this case, the state shown in (a) of FIG. 9A is reached, and the feed pawl 39a engages with the teeth of the feed cam 14a each time welding is performed, and feeds the feed cam 14a.

Since the feed cam 14a is integrated with the feed roller 15, the feed roller 15a rotates and feeds the insert material 102a each time welding is performed. That is, if the “<”-shaped movement between the connecting metal fitting 72 a and the claw 38 a is performed eight times, the feed of the insert material 102 a is also performed eight times.

FIG. 9 (2) shows the hitting interval claw 44a.
Is set so as to mesh with the cam 18a for the interval between two hit points. The cam 18a has a diameter that is one turn smaller than the feed cam 14a, and has four deep grooves. In this figure, when the groove portion is "A" and the grooveless portion is "B", there are four "A" and "B" alternately. Further, the hitting interval changing pawl 44a is
This is a claw that is slightly larger than a.

When the hitting interval changing pawl 44a is located at the "B" portion of the cam 18a, the feed pawl 39a does not reach the teeth of the feed cam 14a as shown in (c) of (2).
When the hitting interval changing pawl 44a falls into the groove "A" of the cam 18a ((a) of (2)), the feed pawl 39a reaches the teeth of the feed cam 14a, and the feed cam 1
Move 4a. When the cam 14a rotates, the insert material 102a is fed. That is, even if the movement of the character "ku" is performed eight times, the feed cam 14a does not rotate four times when the pawl 44a is "B", and four times when the finger 44a is "A". 14a will rotate.

(3) is a case where the hitting interval pawl 44a is set on the 4-hitting interval cam 17a. "A"
There are two places and "B" is six places. As described above,
At the time of "A", the feed cam 14a rotates to feed the insert material 102a. (4) sets the hit point interval nail 44a to 8
This is a case where the cams 16a are set on the cams 16a at point intervals. "A" is one place and "B" is seven places. As described above,
At the time of "A", the feed cam 14a rotates to feed the insert material 102a.

(Operation of Unwinding Prevention Mechanism) The operation of the unwinding prevention mechanism 123a will be described with reference to FIGS. The unwinding prevention mechanism 123a includes a roller mounting column 130a urged by a spring 129a.
With the pressing roller 133a at the tip of the reel 111a, 1
The surface of the insert material 102a wound around the 11b is pressed to prevent the insert material 102a from being loosened from the reel 111a.

The unraveling prevention mechanism 123 is provided in FIG.
As shown in (1), a predetermined posture position for pressing the surface of the insert material 102a is fixed by the action of the spring 121a, the steel ball 122a, and the position fixing groove 118a. Steel ball 12
As 2a gets over the position fixing groove 118a, the rotating portion 123a can freely rotate around the rotating mandrel 117a,
The pressing of the insert material 102a can be released.

(Operation of the slack prevention mechanism) The operation of the slack prevention mechanism will be described in detail with reference to FIGS. As shown in FIG. 7, the slack prevention mechanism 143a
The slack adjusting roller 15 attached to the tip of the roller attaching column 149a urged by the spring 148a
2a presses the insert material 102a. The part of the insert material 102a to be pressed is the two passing rollers 11
4a and 116a, it is in a free state, and by this pressing, the running path of the insert material 102a is bent into a laterally V-shaped state. By this bending,
The slack is removed.

Next, a detailed description will be given in order with reference to FIG.
FIG. 1A shows a state in which the upper electrode 8 is at the upper stopping point. In this state, the insert material 102a is
One is fixed by the pressing roller 32a, and the other is fixed by the unraveling prevention mechanism 123a, and there is no slack. In such a state, the spring 148a of the slack prevention mechanism 143a is contracted by the tension of the insert material 102a.

Then, (2) the upper electrode 8 descends,
When the tension of the insert material 102a is lost and the slack occurs, the spring 148a is extended and pushes the roller mounting column 149a to move the roller mounting column 149a leftward in the drawing, thereby acting to eliminate the slack. Then, the upper electrode 8 comes to the lower stopping point,
Welding is performed. Then, as shown in (3), the upper electrode 8
Is raised, the feed roller 15a rotates to feed the insert material 102a, and again, the insert material 10a
Since tension is generated in 2a, the spring 148a contracts. Thus, the sag of the insert material 102a is prevented.

(Embodiment 2) Embodiment 2 will be specifically described with reference to FIGS. FIG. 12 shows a cassette 210a containing insert materials 217a used in the apparatus of the second embodiment. The rotating parts 213a and 214a corresponding to the reel core of the cassette 210a are attached to a mounting mandrel 18 of an insert material supply device (FIG. 10) described later.
2a, 209a and rotated, and insert material 2
Take up and send 17a.

FIG. 10 is a perspective view of an insert material supply device for feeding an insert material 217a by mounting a cassette as shown in FIG. 12 (partly cut away). This insert material supply device has two reels 211a and 212a in a cassette 210a,
This is an insert material supply device of a type in which an insert material 217a wound around 1a is wound and sent to another reel 212a.

This supply device is also the same as the first embodiment in principle, and the forward and backward movement of the electrode 8, that is, the vertical movement is received by the support leg 205a, and the winding drive cam 183a, which is incorporated in the supply device main body frame 161a, Send 1
The rotational movement is changed by 89a, rotating metal fitting 187a, connecting metal fitting 191a, etc., and the insert material 217a is wound up.

FIG. 11 is a perspective view of a component structure for showing a main part of FIG. Structurally, the first embodiment described above is used.
Is the same as That is, the forward / backward movement, that is, the up / down movement of the electrode 8 is changed into the rotational movement by the cam mechanism. This cam mechanism is configured as follows. That is, the mounting bracket 162a mounted on the electrode 8 is fixedly mounted by the bolts 178a and 179a. The main body frame 161a provided integrally with the mounting bracket 162a has a substantially box shape that is long in the vertical direction.

Two vertically long guide holes 180a and 181a are provided on the front and back of the main body frame 161a.
Are formed. These guide holes 180a, 181a
The shaft Sa serving as the rotation shaft of the take-up cam 183a is attached thereto. That is, the shaft Sa formed integrally with the cassette mounting mandrel 182a is inserted from the front guide hole 180a and fitted into the shaft through-hole 185a of the take-up cam 183a.
A male screw that penetrates 1a and is formed at the tip of the penetrated shaft Sa is screwed into a female screw of the shaft nut 184a.

At this time, the shaft Sa is connected to the rotating bracket 187.
a shaft through hole 188a and cam mounting bracket 1
It also passes through the shaft through hole 198a of the shaft 99a. A spring storing mandrel 201a is integrally provided below the cam mounting bracket 199a. A spring stopper 200a is formed at the center of the spring storing mandrel 201a, and stops the upper end of the spring 203a passed through the spring storing mandrel 201a. The lower end of the spring 203a is stopped by the spring stopper 202a formed below the spring storing mandrel, and is also stopped by the support leg 205a.

That is, the spring storing mandrel 201a in which the spring 203a is arranged on the outer periphery is supported by the supporting leg 205a.
Is stored inside. In addition, the spring storage mandrel 20
The lower end of 1a is provided with a mandrel through hole 207 formed in a mandrel fixing partition 206a formed below the inside of the support leg 205a.
a into the nut 204a.
Screwed. Thus, the lower end of the spring 203a is stopped by the mandrel fixing partition 206a. Therefore,
The spring storage mandrel 201a and the support leg 205a are elastically connected.

Below the support leg 205a, a passing roller 208a for passing the insert material 217a is attached by supporting both ends of a pin 209a serving as a rotating shaft. The insert material 217 a
8a and a flange Fa provided at the lower end of the support leg 205a
Pass between. Rotating bracket 1 through which the shaft is passed
A pin hole 193a is formed in 87a, and the pin Pa is passed therethrough. The pin Pa is further communicated with a pin hole 194a of the feed pawl 189a and a pin hole 192a provided at one end of the connection fitting 191a. Further, a spring 190a is provided on the pin Pa, and the feed pawl 190a is
7a, and the feed pawl 190a is urged in the direction of biting the teeth of the winding cam 183a.

A pin 196a is passed through a pin hole 195a formed at the other end of the connection fitting 191a, and the pin 196a is inserted into the pin hole 1 formed in the main body frame 161a.
97a. With the above-described configuration, substantially the same operation as in the above embodiment is performed, and the same operation and effect can be obtained.

That is, as the electrode 8 advances or descends, the support leg 205a is pressed by the material to be welded 101a (see FIG. 2) and stops. Thereafter, the spring storing mandrel 201a and the winding cam 18 are elastically resilient via the spring 203a.
3a also stops. At this time, since the main body frame 161 continues to descend further, the feed pawl 189 provided to the main body frame 161a via the connecting fitting 191a.
a is disengaged from the teeth of the winding cam 183a.

Next, when the electrode 8 retreats, that is, rises, the ratchet gear-like teeth of the take-up cam 183a engage with the feed pawl 189a and are pushed by the feed pawl 189a so as to be pushed. 183a
Rotates (see the counterclockwise arrow in FIG. 10). With this rotation, the shaft Sa and the cassette mounting mandrel 182a rotate, and accordingly, the take-up reel 212a attached to the cassette mounting mandrel 182a rotates to wind up the insert material 217a (not shown) (FIG. 12).

In the first embodiment as well, as in the second embodiment, the electrode 8 is moved forward and backward several times (up and down).
In this case, a cam mechanism for changing the interval between the spot welding spots on the insert material 217a by winding up the insert material 217a at one time can be provided. As the hit point interval changing cam mechanism, almost the same one as in the first embodiment can be used.

As in the second embodiment, the insert material 217a supplied between the electrode 8 and the material to be welded 101a is prevented from unraveling from the reel 211a of the cassette 210a. It is possible to provide a mechanism and a slack prevention mechanism for preventing the unwound insert material 217a from sagging.
The unraveling prevention mechanism at this time is the insert material 217a wound around the reel 211a of the cassette 210a.
Can be configured to press the roller against the surface of the roller. In addition, the slack prevention mechanism has a mandrel 209a of the reel 211a on which the insert material 217a is wound and stored has a double structure of an inner cylinder and an outer cylinder, and the outer cylinder is biased against the inner cylinder by a spring. The outer cylinder may be configured to always bias the reel 211a in a direction opposite to the unwinding direction.

[0105]

As described above, the first, second, third,
According to the fourth, fifth, sixth, seventh, eighth, ninth or tenth aspect of the invention, it is not necessary to separately provide a drive source such as electricity or air as in the related art, and the insert material is utilized by utilizing the forward and backward movement of the electrode. Can be supplied between the electrode and the material to be welded. Therefore, compared to a case where a driving source such as electricity or air is separately provided, electric wiring and piping for air are not required, and the apparatus can be simplified, downsized, lightened, and energy-saving.

According to the second or sixth aspect of the present invention, a simple structure using a ratchet gear-like feed cam can be obtained, and the cost of the apparatus can be reduced. Further, according to the third or seventh aspect, the cost welding interval can be changed according to the material and thickness of the material to be welded or the state of the electrode,
Insert material can be used without waste.

According to the fourth or eighth aspect of the present invention, the spot welding spot interval can be changed by a simple configuration of a cam and a pawl for changing the spot interval, and the cost of the apparatus can be reduced. Further, according to the ninth aspect, by providing the slack preventing mechanism, it is possible to prevent a problem such as a slack of the insert material, and furthermore, a problem such as twisting. Further, according to the tenth aspect, by providing the slack prevention mechanism of a simple mechanism using the roller and the spring, the cost of the apparatus can be reduced.

[Brief description of the drawings]

FIG. 1 shows an entire stationary resistance spot welding machine to which an insert material supply device according to a first embodiment of the present invention is attached, wherein (A) is a front view and (B) is a side view.

FIG. 2 is an enlarged perspective view of the insert material supply device of FIG.

FIG. 3 shows a main part of FIG. 2, (A) is a front view,
(B) is a right side view, and (C) is a left side view.

4A is a sectional view taken along line AA ′ of FIG. 3A, FIG.
3A is a plan view of FIG. 3A, and FIG. 3C is a rear view of FIG.

FIG. 5 is an exploded perspective view of FIG.

FIGS. 6 (1) to (5) are diagrams for sequentially explaining the operation of the right feeding device in FIG. 3 (A).

FIG. 7 is an exploded perspective view of the unwinding prevention mechanism and the slack prevention mechanism of FIG. 2;

FIGS. 8 (1), (2), and (3) are diagrams for sequentially explaining the operation of the slack prevention mechanism of FIG. 7;

9A and 9B are views for explaining the operation of the hit point interval changing cam mechanism shown in FIG. 5, wherein FIG. 9A is a side view showing a state in which the hit point interval changing cam mechanism is not operated, and FIG. B)
(1) Front view of (A), (A) of (2) is a side view of the state where the cam for the interval between two dots is activated, (A) of (2)
Is a front view of (A) of (2), and (C) of (2) is
(2) (a) is a front view showing the role of the cam, (3) (a) is a side view in a state where the cam for the four-dot interval is operated, and (3) (a) is (3) ) (A) front view,
(C) of (3) is a front view showing the role of the cam of (3) (A), (A) of (4) is a side view of a state in which the cam for the interval between 8 dots is operated, (4) (A) in () is (A) in (4)
(4) is a front view showing the role of the cam (A) in (4).

FIG. 10 is a partially cutaway perspective view showing a main part of an insert material supply device of a second embodiment.

FIG. 11 is an exploded perspective view of a main part of FIG.

12 is a perspective view showing a cassette type insert material used in the insert material supply device of FIG. 10;

[Explanation of symbols]

In this description, the suffixes a and b used in the reference numerals are symmetrically arranged, meaning that there are portions having the same shape, structure, function, and the like. (Whole resistance spot welding machine) 1 solenoid valve 2 pressurizing cylinder 3 controller 4a frame body 4b frame lower stand 5 pressurizing ram 6 upper arm joint 7 upper arm 8 upper electrode 9 lower electrode 10 lower arm 11 lower arm joint 12a upper electrode Current-carrying copper plate 12b Lower-electrode current-carrying copper plate 13 Foot switch (feed device) 14a, 14b Feed cam 15a, 15b Insert material feed roller 16a, 16b Cam for eight-dot spacing 17a, 17b Cam for four-dot spacing 18a, 18b Two-dot spacing Cam 19a, 19b Pin for stopping the cam and the roller 20a, 20b Pin hole for the cam 21a, 21b Pin hole for the insert material feed roller 25a, 25b Wing nut 26a, 26b Washer 27a, 27b Male screw part for the support bracket of the backup roller 28a, 28b Backup roller supporting brackets 29a, 29b Backup roller mounting holes 30a, 30b Backup roller mounting holes 31a, 31b Backup rollers 32a, 32b Pressing rollers 33a, 33b Pressing roller pins 34a, 34b Rotating brackets 35a, 35b Backup roller mounting holes 36a, 36b Hold-down roller mounting holes 37a, 37b Hold-down roller mounting holes 38a, 38b Feed cam pawl 39a, 39b Feed cam pawl 40a, 40b Screw through holes 41a, 41b Attachment grooves 42a, 42b Claw stand for changing the hitting interval 43a, 43b Screws for changing the hitting interval 44a, 44b Claws for changing the hitting interval 45a, 45b Wing nuts 46a, 46b Washers 47a , 47b Nail holder holding springs 48a, 48b Nail holder mounting holes 49a, 49b Nail holder mounting holes 50a, 50b Nail holder mounting holes 51a, 51b Nail holder pin holes 52a, 52b Nail holder pin holes 53a, 53b For rollers and cams Shafts 54a, 54b Rollers, cam mounting brackets 55a, 55b Shaft through holes 56a, 56b Shaft through holes 57a, 57b Feed cam shaft through holes 58a, 58b Insert material feed roller shaft through holes 59a, 59b Send every eight-point welding Cam shaft through-holes 60a, 60b Cam shaft through-holes, which are fed every four-point welding 61a, 61b Cam shaft through-holes, which are sent every two-point welding 62a, 62b Shaft through-holes with rotating fittings 63a, 63b Shaft-through with rotating fittings Hole 64a, 64b low Mandrel of cam mounting bracket 65a, 65b spring 66a, 66b bolt 67a, 67b feeder frame 68a, 68b insert material passage groove 69a, 69b insert material passage groove 70a, 70b shaft movement rail groove 71a, 71b shaft movement rail groove 72a, 72b Rotating bracket connecting bracket 73a, 73b Rotating bracket mounting pin hole 74a, 74b Mounting pin hole for feeder frame 75a, 75b Rotating bracket connecting bracket mounting pin hole 76a, 76b Pin 77a, 77b Feeder mounting bracket 78a, 78b Feed Device mounting holes 79a, 79b Roller and cam mounting bracket mandrel through holes 80a, 80b Electrode mounting holes 81a, 81b Support leg mounting brackets 82a, 82b Support leg mounting holes 83a, 83b Bolt through Holes 84a, 84b Bolts 85a, 85b Nuts 86a, 86b Support legs 87a, 87b Roller mounting pin holes 88a, 88b Roller mounting pin holes 89a, 89b Roller mounting windows 90a, 90b Rollers 91a, 91b Pins 92a, 92b Support leg shaft through grooves 93a, 93b Support leg mandrel 94a, 94b Support leg variation spring 95a, 95b Washer 96a, 96b Nut 97a, 97b Contact metal fixing pin (reel for welded material and insert material) 101a, 101b Welded material 102a, 102b Insert material 103a, 103b Reel mounting plate 104a, 104b Reel mounting mandrel bearing fixing hole 105a, 105b Insert material passing roller bearing fixing hole 106a, 106b Insert material passing Roller bearing fixing holes 107a, 107b Insert material retainer mounting holes 108a, 108b Insert material slack adjusting metal fitting mounting holes 109a, 109b Reel mounting mandrel bearings 110a, 110b Reel mounting mandrels 111a, 111b Reel 112a, 112b Reel mounting grooves 113a, 113b Insert material passing roller bearing 114a, 114b Insert material passing roller 115a, 115b Insert material passing roller bearing 116a, 116b Insert material passing roller (winding prevention mechanism) 117a, 117b Insert material presser rotating mandrel 118a, 118b Insert material Holding tool position fixing groove 119a, 119b Insert material holding tool rotating mandrel pin hole 120a, 120b Hole closing screw 121a, 121b Spring 122a, 122b Steel ball 123a, 123b Insert material retainer rotating part 124a, 124b Insert material retainer position fixing component storage hole 125a, 125b Insert material retainer rotating hole 126a, 126b Washer 127a, 127b Bolt 128a, 128b Spring Storage mandrel 129a, 129b Spring 130a, 130b Roller mounting column 131a, 131b Pin hole 132a, 132b Pin 133a, 133b Insert material holding roller 134a, 134b Insert material holding roller pin hole 135a, 135b Spring storage mandrel fixing screw (slack prevention mechanism) 136a 136b Insert material slack adjustment metal fitting rotary table 137a, 137b Insert material slack adjustment metal fitting rotary mandrel Attachment holes 138a, 138b Insert material slack adjustment fitting turntable mounting holes 139a, 139b Insert material slack adjustment fitting turntable mounting bolts 140a, 140b Insert material slack adjustment fitting turntable mounting screws 141a, 141b Insert material slack adjustment fitting rotation mandrel 142a , 142b Insert material slack adjusting metal fittings rotating base mounting screw holes 143a, 143b Insert material slack adjusting metal fittings 144a, 144b Insert material slack adjusting metal fittings angular grooves 145a, 145b Insert material slack adjusting metal fittings rotary mandrel passage holes 146a, 146b Spring prevention parts 147a 147b Spring storage mandrel 148a, 148b Spring 149a, 149b Insert material slack adjusting roller mounting column 150a, 150b Pin hole 1 1a, 151b Pin 152a, 152b Insert material slack adjusting roller 153a, 153b Spring storing mandrel fixing screw 154a, 154b Upper reel mounting plate fixing metal 155a, 155b Lower reel mounting plate fixing metal (Feeding device of the second embodiment) 161a, 161b Main body Frame 162a, 162b Electrode mounting bracket 163a, 163b Electrode mounting hole 164a, 164b Electrode mounting hole 165a, 165b Electrode mounting hole 166a, 166b Electrode mounting hole 178a, 178b Electrode mounting bolt 179a, 179b Electrode mounting bolt 180a, 180b Shaft guide hole 181a , 181b Shaft guide holes 182a, 182b Cassette mounting mandrel (shaft plate) 183a, 183b Take-up cam 18 a, 184b Nut 185a, 185b Shaft through hole 186a, 186b Shaft connection screw hole 187a, 187b Rotating bracket 188a, 188b Shaft through hole 189a, 189b Feeding jaw 190a, 190b Nail spring 191a, 191b Connecting metal fitting 192a, 192b Pin holes 193a, 193b Pin holes 194a, 194b Pin holes 195a, 195b Pin holes 196a, 196b Pins 197a, 197a, 197a, 197b Connection metal fitting pin holes 198a, 198b Shaft through holes 199a, 199b 200a, 200b Spring stopper 201a, 201b Spring storing mandrel 202a, 202b Spring stopper 203a, 203b Spring 04a, 204b Nut 205a, 205b Support leg 206a, 206b Mandrel fixing end 207a, 207b Mandrel through hole 208a, 208b Insert material passing roller 209a, 209b Cassette mounting mandrel 210a, 210b Insert material storage cassette 211a, 211b Insert material take-up reel 212a , 212b Insert material take-up reel 213a, 213b Rotating core 214a, 214b Take-up drive connection core 215a, 215b Insert material guide 216a, 216b Insert material guide 217a, 217b Insert material

Claims (10)

[Claims] When the electrode is pressed and energized through a tape-shaped conductive insert material by conducting and retreating the electrode to conduct electric resistance spot welding, it is synchronized with the timing of the advance and retreat of the electrode. Intermittently, in an automatic insert supply device for automatically supplying an insert material between an electrode and a material to be welded, a cam mechanism for changing a forward / backward movement of the electrode into a rotary motion, and a state in which the insert material is clamped. An automatic insert feeder for resistance spot welding, comprising: a pair of rollers that rotate by the rotation of the cam mechanism and feed the insert material. 2. The cam mechanism is provided on the electrode side via a spring so that the frame is stopped by being pressed by the material to be welded as the electrode advances, a feed pawl provided on the frame side, Similar to a ratchet gear in which the feed pawl is formed with teeth that mesh with it and is provided directly on the electrode side so that the meshing slides forward with the advancement of the electrode and retreats with the retreat of the electrode and retreats with the meshing. A pair of rollers, the pair of rollers being a feed roller fixed coaxially to the feed cam, and a pressing roller for holding an insert material between the feed rollers. The automatic insert supply device for electric resistance spot welding according to claim 1. 3. A spot interval changing cam mechanism for changing an interval between spot welding spots on the insert material by feeding the insert material in synchronization with several forward and backward movements of the electrode. Item 6. An automatic insert supply device for electric resistance spot welding according to item 1 or 2. 4. The hit point interval changing cam mechanism includes: a plurality of hit point interval changing cams provided coaxially with the feed cam; and grooves provided at different intervals for each of the hit point interval changing cams. The mounting position is changed so as to be integrally attached to the feed pawl so as to mesh with any one of the plurality of hit point interval changing cams, and engagement of the feed pawl is allowed only in a state where the cam is dropped into the groove. 4. An automatic insert feeding device for electric resistance spot welding according to claim 3, further comprising: a nail for changing a hit point interval, the size of which is set so as to be performed. 5. An electric resistance spot welding pressurizing and energizing a material to be welded via a tape-shaped conductive insert material by advancing and retracting an electrode, intermittently in accordance with the timing of advance and retreat of the electrode. An automatic insert supply device for automatically supplying an insert material between an electrode and a material to be welded, comprising: a cam mechanism for changing a forward / backward movement of the electrode into a rotary motion; and a cam mechanism with the insert material wound. An automatic insert feeding device for electric resistance spot welding, comprising: a take-up reel that rotates by rotating motion to feed the insert material. 6. The cam mechanism has a frame provided on an electrode side, and a supporting leg which is guided by a long guide hole with respect to the frame to be stopped by being pressed by a material to be welded as the electrode advances. And a feed pawl provided on the frame side, and a tooth that meshes with the feed pawl is formed and provided directly on the support leg, so that the mesh slips with the advance of the electrode, and the mesh with the retreat of the electrode. 6. An automatic insert feeding device for electric resistance spot welding according to claim 5, further comprising: a ratchet gear-shaped winding cam which is rotated by rotation. 7. A spot interval changing cam mechanism for changing an interval between spot welding spots on the insert material by winding up the insert material in accordance with timings of forward and backward movements of the electrode several times. The automatic insert supply device for electric resistance spot welding according to claim 5 or 6. 8. The hit point interval changing cam mechanism includes a plurality of hit point interval changing cams provided coaxially with the take-up cam, and grooves provided at different intervals for each of the hit point interval changing cams. The mounting position is changed so as to be integrated with the feed pawl and engage with an arbitrary one of the plurality of hit point interval changing cams, and the meshing of the feed pawl is only performed in a state where the cam is dropped into the groove. A hitting interval change pawl whose dimensions are set to be acceptable,
The automatic insert feeding device for electric resistance spot welding according to claim 7, comprising: 9. A slack preventing mechanism for preventing a slack of an insert material supplied between the electrode and the material to be welded is provided. The automatic insert feeding device for electric resistance spot welding according to 1. 10. The slack preventing mechanism includes a roller that contacts the free portion of the insert material with a small friction, and a spring that biases the roller to move toward the insert material. The automatic insert supply device for electric resistance spot welding according to claim 9, wherein