JPH0417757B2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a power supply device for an X-type gun.

(Prior art) In this type of power supply device for an X-type gun, one terminal of a power supply cable is fixed to one electrode arm of the X-type gun, and the other terminal of the power supply cable has a flexible copper plate. Generally, the electrode arm is connected to the other electrode arm of the X-type gun. However, since the copper plate is subjected to bending action each time the electrode arm operates, there is a risk of fatigue failure due to this repeated bending.

In order to improve the drawbacks of the prior art, the invention of Utility Model Publication No. 58-56070 has been proposed.
In this invention, a flat bearing type power receiving bushing is fitted to the arm of one electrode, an insulating bushing is fitted to the arm of the other electrode, and the shaft passing through both bushings and pivoting both arms is connected to the feeding shaft. In this case, power is supplied from the power supply shaft to one electrode via the power receiving bushing, and the abrasion powder generated between the power supply shaft and the power receiving bushing causes the two parts to weld, or the electrical resistance increases due to the intervention of the abrasion powder. In order to prevent this, a large number of recesses filled with grease are provided on the inner surface of the power receiving bushing, and the grease attracts abrasion powder.

(Problem to be Solved by the Invention) However, even if the improved means described above is used, it is difficult to sufficiently prevent welding because it is impossible for all of the wear particles to be absorbed by the recesses. .
In addition, since the power receiving bushing and the current carrying bearing slide with friction, it is easy for looseness to occur due to wear. If looseness occurs, the contact area decreases, the current density increases, and further welding occurs. It becomes easier.

Furthermore, if looseness occurs, there is no way to remove it from the outside, and the device must be disassembled and repaired.

(Means for Solving the Problems) The present invention aims to improve the above problems, and its means include a pair of electrode arms each having a tip at the tip thereof protruding from the middle portion of each electrode arm. In an X-type gun, which is inserted in an insulated state between the shaft support pieces and is pivotally supported via a support shaft, and a pressure cylinder is provided at the rear of one electrode arm, and the piston rod of the cylinder is connected to the rear of the other electrode arm. , one terminal of a power supply cable is connected to the rear end of the one electrode arm, and the other terminal of the power supply cable is connected to a power supply bar that is insulated and pivotally supported on the support shaft, and the shaft support of the power supply bar is connected to the rear end of the one electrode arm. A ball type feeder is provided between the opposing side surfaces of the shaft support piece of the other electrode arm and the opposite sides of the shaft support piece of the other electrode arm, and a ball type feeder is provided which is pressurized between the side surfaces, and the ball type feeder is used to connect the power feed bar is connected to the other electrode arm.

(Function) With the above configuration, power is supplied directly to one electrode from the power supply cable, and power is supplied to the other electrode via the ball-type feeder provided between the electrode and the side surface of the power supply bar. The ball type feeder supplies electricity through a large number of balls, so it has good electrical conductivity and has little frictional resistance and wear when the arm rotates. Since the ball type feeder is interposed in a pressurized state, even if wear occurs, the connected state is maintained and the conductivity does not change.

(Example) As explained below based on the drawings, the upper electrode arm 2 and the lower electrode arm 3 having the tip 1 at the tip are as follows.
A shaft support piece 5, which is protruded from the middle part of the lower electrode arm 3, is inserted between the bifurcated shaft support pieces 4, 4 which are protruded from the middle part of the upper electrode arm 2. A support shaft 7 is inserted in an insulated state between 5 and 5 through an insulator 6.
The piston rod 9 of the pressure cylinder 8 provided at the rear of the lower electrode arm 3 is pivotally supported by the link 10 provided at the rear of the upper electrode arm 2 to form an X-shaped gun. Furthermore, the positive terminal 12 of the cable 11 is attached to the rear end of the upper electrode arm 2.
At the same time, a power supply bar 14 is connected to the negative terminal 13 of the cable 11, and the other end of the power supply bar 14 is insulatedly supported on the support shaft 7 via the insulator 6, and the other end of the power supply bar 14 is A ball-shaped feeder 15 with a large number of balls interposed on the side surface was provided, and the power feeder bar 14 was connected to the lower electrode arm 3 via the feeder 15 . 16 in the figure is the power supply bar 14 and the power supply electron 15
A disc spring for press-contacting the lower electrode arm 3 to the lower electrode arm 3 is shown.

According to the embodiment of the present invention configured as described above, the upper and lower electrode arms 2 and 3 are opened and closed with low friction by the operation of the pressurizing cylinder 8, and the tip tips 1 and 3 of the upper and lower electrode arms 2 and 3 are opened and closed with low friction.
When the cable 11 is energized with the workpiece being pressurized by the power supply bar 1, the current from the negative terminal 13 is transferred to the power supply bar 1.
4. A ball-shaped feeder 15 flows to the positive terminal 12 via a large number of balls, the lower electrode arm 3 and the upper electrode arm 2, and welds the workpiece.

(Effects of the Invention) According to the present invention, one terminal of the power supply cable is connected to one rear end of the electrode arm, and the other terminal of the power supply cable is pivotally supported on the support shaft in an insulated state. connected to a power supply bar, interposing a large number of balls between the shaft support of the power supply bar and the opposing side surface of the shaft support piece of the other electrode arm;
In addition, since a ball type feeder is provided which is pressurized between the sides, and the power feed bar is connected to the other electrode arm by the ball type feeder, a large number of balls are connected between the power feed bar and the other electrode. Since power is supplied through the
In addition, there is little frictional resistance, so no wear occurs, and even if wear particles are generated, there are large gaps between the balls and between the parts surrounding the balls, so the wear particles separate from the balls and prevent welding. It has the effect of Since the ball type feeder is interposed in a pressurized state, even if it wears out, the connection state is maintained and the conductivity does not change, so it has the advantage of being durable for long-term use.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a side view, and FIG. 2 is a sectional view taken along the line A--A in FIG. 1. DESCRIPTION OF SYMBOLS 1... Chip, 2... Upper electrode arm, 3... Lower electrode arm, 4... Upper shaft support piece, 5... Lower shaft support piece, 7
... Support shaft, 8... Pressure cylinder, 9... Piston rod, 11... Power supply cable, 12... + terminal, 13...
-terminal, 14...power supply bar, 15...power supply, 16...
Disc spring.

Claims (1)

[Claims] 1 A pair of electrode arms with a tip at the tip,
The electrode arm is inserted in an insulated state between the shaft support pieces protruding from the middle of each electrode arm, and is supported via a support shaft.A pressurizing cylinder is provided at the rear of one electrode arm, and the piston rod of the cylinder is connected to the other electrode arm. In the X-type gun connected to the rear, one terminal of a power supply cable is connected to the rear end of the one electrode arm, and the other terminal of the power supply cable is connected to a power supply bar that is insulated and pivotally supported on the support shaft. and a ball-type feeder is provided in which a large number of balls are interposed between the pivot support of the power supply bar and the opposing side surfaces of the pivot support piece of the other electrode arm, and the ball-type feeder is pressurized between the side surfaces. ,
A power supply device for an X-type gun, characterized in that a power supply bar is connected to the other electrode arm by the ball-type power supply.