JPH06335779A - Seam welding equipment - Google Patents

Abstract

PURPOSE:To smoothly rotate a rotary roller electrode by supporting a conductive shaft freely rotarably by radial bearings and providing a rotary energizing body between the conductive shaft and a power feeding member. CONSTITUTION:The conductive shaft 2 of the roller electrode 1 is fixed on inner rings of the radial bearings 6 and 7 and arranged inside a through hole 3A of an electrode holder member 3. In order to insulate electrically between the electrode holder member 3 and the radial bearings 6 and 7, and electric insulating tube 8 is fitted to the through hole 3A inside. There is a shallow conical recessed part 2B on the center of the other end 2A of the conductive shaft 2. There is a shallow conical recessed part 9B on the center of the tip 9A of the power feeding member 9 and a ball which is the rotary energizing body 10 is arranged between the recessed parts 2B and 9B. The power feeding member 9 is pressed on the conductive shaft 2 via the rotary energizing body 10 by a pressurizing member 12 such as a coil spring to ensure energizing. While a seam welding current is passed to packaging, the roller electrode 1 can be rotated smoothly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seam welding device for sealing a case and a lid that house circuit elements or electronic circuits in the manufacture of electronic parts such as crystal oscillators and semiconductor integrated circuits.

[0002]

2. Description of the Related Art As is generally known, crystal oscillators and semiconductor elements are easily affected by the external environment, and therefore many are hermetically sealed in packages. In such a package, the rectangular case is hermetically sealed by parallel seam welding in which a rectangular case temporarily attached with a lid reciprocates between roller electrodes arranged in parallel. This example will be described with reference to the parallel seam welding apparatus disclosed in Japanese Patent Publication No. 56-2416. As shown in FIG. 4, first, a rectangular case 21 accommodating a circuit element or an electronic circuit is mounted on a rotary table 22. Then, the square-shaped seal frame 24 on the square-shaped case 21 is covered with the square-shaped lid 23, and then the drive switch is turned on. As a result, the pair of roll-shaped electrodes 25, 25 descend to the rectangular seal frame 24 and hold down the rectangular lid 23.

Next, while the pair of roll-shaped electrodes 25, 25 are energized, the rotary table 22 moves in the direction of the arrow (to the front),
The long side is sealed. When the sealing of the long side is completed, the rotary table 22 is turned by 90 ° and then moves in the direction of the arrow (hand), and similarly, the sealing of the short side is completed. Then, the turntable 22 turns 90 ° and returns to the original position. In addition, many others have been devised, such as one in which the shape of the roll-shaped electrodes 25, 25 is devised, and one in which a rectangular case is improved.

FIG. 5 shows a supporting structure and a current-carrying structure of a roll-shaped electrode, that is, a roller electrode of a conventional seam welding apparatus used for such seam welding.
The roller electrode 1 is fixed to one end of the cylindrical conductive shaft 2. The cylindrical conductive shaft 2 is inserted into and supported by the through hole 3A of the electrode holder member 3 and is rotated by sliding friction. Here, the diameter of the columnar conductive shaft 2 is slightly smaller than the diameter of the through hole 3A of the electrode holder member 3, and conductive grease is injected into the space between the columnar conductive shaft 2 and the electrode holder member 3, for example. Sliding friction with the inner wall of the through hole 3A of No. 3 is reduced.

However, in order for the cylindrical conductive shaft 2 and the roller electrode 1 to perform a stable rotating operation, the cylindrical conductive shaft 2 is set to be relatively long, and if it is long, conductive grease is injected. Since the frictional force becomes large and the rotation of the roller electrode 1 cannot be performed smoothly, the outer shape of the intermediate portion of the cylindrical conductive shaft 2 is made smaller than that of the other portion, and the intermediate portion of the through hole 3A of the electrode holder member 3 is formed. The diameter is small so that the void 3B is formed without contacting the wall surface. A retaining member 4 is fixed to the other end of the columnar conductive shaft 2, and the axial movement of the columnar conductive shaft 2 is restricted between the roller electrode 1 and the electrode holder member 3. There is a collar 5 for.

Although not shown here, the electrode holder member 3 can be moved up and down by a vertical movement mechanism, and can be moved horizontally by a traveling device that can move in the front and back directions of the drawing. As described above, during seam welding, the electrode holder member 3 descends downward, and the electrode holder member 3 moves horizontally while the roller electrode 1 pressurizes the object to be welded, which causes friction with the object to be welded. The roller electrode 1 moves on the workpiece while rotating. Therefore, during seam welding, the welding current is
It flows through the cylindrical conductive shaft 2 and the roller electrode 1 to the object to be welded.

[0007]

However, in such a mechanism, the cylindrical conductive shaft 2 and the electrode holder member 3 are used.
Since the cylindrical conductive shaft 2 is frictionally rotated with respect to the electrode holder member 3 in a state in which a pressing force is applied between
There is a drawback that the frictional force between them cannot be made small enough, and therefore the shaft has to be replaced frequently because of its short life, and conductive grease is injected between them to remedy the drawback to some extent. Although the frictional force is reduced to some extent, the conductive grease flows out,
Welded objects were stained and the surroundings were also polluted, and no reliable product was obtained.

The present invention solves such a conventional problem and smoothes the rotation of the roller electrode which rotates while supplying a seam welding current to the packaging, and at the same time, provides a sufficiently reliable seam welding apparatus. It is intended to be provided.

[0009]

In order to solve the above-mentioned problems, the present invention provides an apparatus for seam welding a case and a lid which house predetermined circuit elements or electronic circuits,
A roller electrode fixed to one end side of the cylindrical conductive shaft, a radial bearing supporting the cylindrical conductive shaft, an electrode holder member holding the radial bearing, and a power feeding member for supplying electric power for seam welding, A rotating current-carrying member provided between the power-supplying member and the tip end surface of the cylindrical conductive shaft; and a pressure member for pressing the power-supplying member so that the power-supplying member applies a predetermined pressure to the rotating current-carrying member. I have it.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. First, referring to FIG. 1, an embodiment of the present invention will be described. A cylindrical conductive shaft 2 having a roller electrode 1 made of copper or the like having good conductivity inserted at one end is a pair of ordinary radial bearings 6, 6.
It is fixed to the inner ring of 7 and these radial bearings 6 and 7
Is arranged in the through hole 3A of the electrode holder member 3. In order to electrically insulate the electrode holder member 3 and the pair of radial bearings 6, 7 from each other, an electrically insulating tube 8 is provided to the electrode holder member 3
Is installed in the through hole 3A of the
A pair of radial bearings 6 and 7 are inserted therein. The one end of the electrically insulating tube 8 has a small diameter to prevent the radial bearing 6 from falling off.

In this embodiment, the radial bearing 6,
Since an electrically insulating tube 8 is used as the material 7 made of a metal material, when the radial bearings 6, 7 are made of a ceramic material or an electrically insulating resin, or when the outer rings of the radial bearings 6, 7 are made of rubber. In the case where such an electrically insulating material is attached, the electrically insulating tube 8 can be omitted. In addition, in order to improve heat dissipation, the electrode holder member 3
Although a metal material with good electrical conductivity such as brass was used, if it is not necessary to take heat dissipation into consideration, such as when the welding current is small, an electrically insulating material such as synthetic resin may be used. Can use a metal radial bearing without using the electrically insulating tube 8.

Here, the electrode holder member 3 and the radial bearings 6 and 7 are electrically insulated from each other because when the welding current flows from the radial bearings 6 and 7 through the electrode holder member 3 to another member, a large power loss occurs. At the same time, the service life of the bearings 6 and 7 is shortened due to electrolytic corrosion due to differences in metal materials.

The other end 2A of the cylindrical conductive shaft 2 has a large diameter, and a shallow conical recess 2B is provided at the center of the end surface. Further, the tip portion 9A of the power feeding member 9
Also has a large diameter, and a recess 2B is formed in the center of the tip surface.
A shallow conical recess 9B, which is almost the same as the above, is provided. The recesses 2B and the recesses 9B face each other in a substantially coincident manner, and a ball, which is the rotary electric conductor 10, is arranged between the recesses. Thus, by sandwiching the ball, which is the rotary conductor 10, between the recesses 2B and the recesses 9B, which are substantially the same in shallow conical shape, the ball, which is the rotary conductor 10, and the wall of the recess 2B,
The contact area with the wall of the recess 9B is increased, so
The end face of the other end 2A of the cylindrical conductive shaft 2 and the power feeding member 9
The energization area can be made much larger than in the case where the end surface of the tip portion 9A is flat.

Since the depths of the recesses 2B and 9B are smaller than the radius of the ball, the end surface of the other end 2A of the cylindrical conductive shaft 2 and the tip 9 of the feeding member 9 are formed.
It is separated from the end face of A, and electrically, the power feeding member 9 passes through the ball, which is the rotating current-carrying body 10, through the cylindrical conductive shaft 2
Be combined with.

The power feeding member 9 is supported by an electrically insulating bracket 11 made of synthetic resin or the like, and the other end portion 2A of the cylindrical conductive shaft 2, the tip end portion 9A of the power feeding member 9 and the rotary conductive member 10 are mounted on the bracket 11. Located inside. The inner diameter of the bracket 11 is somewhat larger than the outer shape of the other end 2A of the cylindrical conductive shaft 2, and the cylindrical conductive shaft 2 can rotate without being hindered by the inner wall of the bracket 11. Further, the inner diameter of the bracket 11 is equal to the power feeding member 9
It is slightly larger than the outer shape of the front end portion 9A, and the bracket 11 supports the power feeding member 9 so that it can slide in the axial direction. The bracket 11 is fixed to another member (not shown).

A pressure member 12 such as a compression coil spring is provided in the space formed between the inner wall of the bracket 11 and the power feeding member 9, and this compression coil spring is rotated and electrically energized with the tip portion 9A of the power feeding member 9. Between the body 10 and the ball,
Also, it plays a role of applying a pressing force in a predetermined range between the ball, which is the rotating electric conductor 10, and the other end 2A of the cylindrical conductive shaft 2. If the pressing force of the pressing member 12, that is, the pressing force of the power supply member 9 and the cylindrical conductive shaft 2 in the axial direction is too strong, the friction between the rotating current-carrying body 10 and the cylindrical conductive shaft 2 increases, and the roller electrode 1 Becomes difficult to rotate, and if the pressing force of the pressing member 12 is too weak, the contact between the rotating current-carrying body 10 and the cylindrical conductive shaft 2 becomes unfavorable, which causes a problem that the welding current hardly flows. The power is supplied to the power supply member 9 extending outward from the bracket 11 through a welding transformer (not shown).

A conductive grease 13 is injected into the space between the tip portion 9A of the power feeding member 9 on which the rotary electric conductor 10 is arranged and the other end portion 2A of the cylindrical conductive shaft 2. The conductive grease 13 is applied between the tip portion 9A of the power supply member 9 and the ball, which is the rotating conductor 10, and the rotating conductor 1.
The rotating current-carrying body 1 without substantially reducing the conductive state between the ball which is 0 and the other end 2A of the cylindrical conductive shaft 2.
This is for smoothly rotating 0.

Here, a shield plate for preventing leakage of grease injected to keep smooth rotation of the balls of the bearing for a long time and sealing for preventing dust from entering is provided on the inner and outer ring sides. The provided radial bearing is general, and by using such a bearing as the radial bearings 6 and 7, the conductive grease 13 is blocked by the radial bearings 6 and 7 and does not leak to the roller electrode 1 side. . Bracket 1
An O-ring 14 provided between the power feeding member 9 and the power feeding member 9 prevents the conductive grease 13 from leaking to the outside of the bracket 11 through the power feeding member 9.

In the seam welding apparatus having such a structure, the cylindrical conductive shaft 2 supporting the roller electrode 1 is supported by the radial bearings 6 and 7, and the end surface thereof is the rotating electric conductor 10. Since the ball can also rotate due to the rotation of the end face while being in contact with the roller, the frictional force when the roller electrode 1 rotates is sufficiently smaller than the conventional one, and the roller electrode 1 is rotatable. Further, since the welding current is fed to the roller electrode 1 through the non-rotating power feeding member 9, the ball which is the rotating current-carrying body 10, and the cylindrical conductive shaft 2, there is substantially no power loss from the non-rotating power feeding member 9 to the rotating member. Power can be supplied without occurring.

Next, another embodiment of the present invention will be described with reference to FIG. In the figure, the same symbols as those shown in FIG. 1 indicate corresponding members. This embodiment differs from the embodiment shown in FIG. 1 in that the other end 2A of the cylindrical conductive shaft 2 is
And the shape of the tip portion 9A of the power feeding member 9 and the rotary electric conductor 10
Only these will be explained. The other end surface 2A of the cylindrical conductive shaft 2 and the end surface 9A of the power feeding member 9 are circular flat surfaces. The rotating electric body 10 includes a plurality of balls 10A made of a metal material and a retainer member 10B that holds the plurality of balls 10A at regular intervals.

The retainer member 10B has a plurality of holes larger than the diameter of the ball 10A at regular intervals, and holds one ball 10A in each of these holes. Ball 10
A is sandwiched between the flat surface of the other end portion 2A of the cylindrical conductive shaft 2 and the flat surface of the tip portion 9A of the power feeding member 9, and the ball 10A also rotates with the rotation of the cylindrical conductive shaft 2 and does not rotate. The tip end 9A of the power feeding member 9 and the rotating columnar conductive shaft 2 are coupled with each other by minute friction. The other end 2A of the cylindrical conductive shaft 2 and the tip 9A of the power feeding member 9
Of course, a shallow groove on which the ball 10A rolls may be formed on each end face.

In the embodiment of FIG. 2, a plurality of balls 10
Instead of the rotary electric conductor 10 composed of A and the retainer member 10B that holds the plurality of balls 10A at regular intervals, a normal thrust bearing as shown in FIG. 3A may be used as the rotary electric conductor 10. . The thrust bearing mainly includes a plurality of balls 10A made of a metal material, a retainer member 10B that holds the plurality of balls 10A at regular intervals, and first and second balls 10A that sandwich the ball 10A from both sides.
Consisting of metal bearing rings 10C, 10D of
The bearing rings 10C and 10D of the columnar conductive shaft 2 of FIG.
Even if the structure is sandwiched between the other end 2A and the tip 9A of the power feeding member 9, the same effect can be obtained.

Alternatively, a pivot bearing structure as shown in FIG. 3 (B) may be used. A plurality of metal balls 10A are arranged in a metal container 10E, and a window 10 is provided at the center.
A shield plate 10G having F is fixed to the upper end of the metal container 10E. The other end 2A of the cylindrical conductive shaft 2
Has a conical shape. Therefore, the metal container 10E
The bottom surface of the power feeding member 9 is brought into contact with the flat surface of the tip portion 9A, and the conical other end portion 2A of the cylindrical conductive shaft 2 is attached to the shield plate 1.
It is inserted through the 0G window 10F and pressed against the plurality of balls 10A with an appropriate pressure. With such a structure, a commercially available bearing can be used, and the same effect as that of the above embodiment can be obtained.

[0024]

As described above, according to the present invention, a sufficiently reliable seam welding apparatus can be provided while smoothing the rotation of the roller electrode that rotates while applying a seam welding current to the packaging. Can be provided.

[Brief description of drawings]

FIG. 1 is a diagram for explaining one embodiment of a seam welding device according to the present invention.

FIG. 2 is a diagram for explaining another embodiment of the seam welding apparatus according to the present invention.

FIG. 3 is a view for explaining another embodiment of the seam welding device according to the present invention.

FIG. 4 is a diagram for explaining conventional seam welding.

FIG. 5 is a diagram for explaining a conventional seam welding device.

[Explanation of symbols]

 1 ... Roller electrode 2 ... Cylindrical conductive shaft 3 ... Electrode holder member 3 6,7 ... Radial bearing 8 ... Electrically insulating tube 9 ... Feeding member 10 ... ... Rotating electrical conductor 11 ... Bracket 12 ... Pressurizing member 13 ... Conductive grease 14 ... O ring

Front page continuation (72) Inventor Shizuo Negishi 1-18-1 Takada, Toshima-ku, Tokyo Inside Origin Electric Co., Ltd.

Claims (2)

[Claims] 1. A roller electrode fixed to one end of a cylindrical conductive shaft and a cylindrical conductive shaft rotating in a device for seam welding a case containing a predetermined circuit element or an electronic circuit and a lid. One or more radial bearings that are freely supported; an electrode holder member that holds the radial bearings; a power supply member that applies electric power for seam welding to the case and lid through the cylindrical conductive shaft and roller electrode; A rotating current-carrying member provided between the power-supplying member and the other end of the cylindrical conductive shaft; and a pressing member that pressurizes the power-supplying member so that the power-supplying member applies a predetermined pressing force to the rotating current-carrying member. A seam welding device characterized by having. 2. The rotating electric body is composed of a single ball, and is supported by a conical recess formed on the tip surface of the power supply member and a conical recess formed on the other end of the cylindrical conductive shaft. The seam welding apparatus according to claim 1, wherein: