JPS6245821Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in welding wire feeding devices.

Conventionally, as shown in FIG. 4, a welding wire feeding device in an automatic welding apparatus has a reel ( (not shown)
A wire pulled out from the wire is inserted, and the wire is fed by forced rotation of the drive roller 7.

However, the wire pulled out from the reel usually has a curl, and in the above device, the wire enters between the rollers 7 and 70 in a slightly twisted state due to this curl, and the wire remains in the twisted state and is unwound. It will be done.

The wire applies a rotational force to the pressure roller 70 to untwist it, but the pressure roller 70 is structured so that it cannot move in the axial direction of the roller shaft.
The twist of the wire 11 between the reel and the pressure roller 70 increases, and in extreme cases there is a risk that the wire will break. Further, the wire 11 is connected to the roller 70,
There was a problem that the twist was released the moment the wire passed through 72 and the tip of the wire 11 swung, causing the tip of the wire to come off the welding position.

In this invention, by disposing a spherical pressure member facing the drive roller so that it can approach and separate and freely rotate, the wire passes between the sphere and the roller, and the twisting of the wire is released. To provide a welding wire feeding device capable of feeding a welding wire in a state in which the twist disappears when the wire is gripped between the wires, thereby preventing cutting due to twisting of the wire and deflection of the tip of the wire.

The present invention will be specifically described below based on embodiments shown in the drawings.

As is well known, the wire feeding device 1 includes a plurality of wire straightening rolls 4, 4, 4, and a welding torch 5 removably attached to a fitting hole 31 at the bottom of a support base 3 attached to a welding head mounting stand 2, as is known in the art. A feeding drive unit 6 is provided in the center.

The feed drive section 6 is constructed by disposing a disc-shaped drive roller 7 and a spherical pressure member 8 facing each other, with a linear transition path of the wire interposed between the straightening roll 4 and the welding torch 5.

The drive roller 7 is rotatably supported by the support base 3, and has a semicircular circumferential groove 71 recessed on its outer periphery, and a guide groove that runs around the roller and runs along the outer diameter of the wire in the center of the circumferential groove 71. 72 have been established.

A drive motor 32 attached to the support base 3 is linked to the drive roller 7 .

A pressing lever 61 is provided on the opposite side of the drive roller 7 across the linear transition path of the wire 11, and the base end of the lever 61 is pivotally fixed to the support base 3 so as to be swingable.

A through hole 62 is formed at the tip of the lever 61, and a pressure adjustment bolt 63 is screwed into the support base 3 by passing through the hole 62 with a sufficient margin.

The lever 61 is urged toward the drive roll 7 by a spring 65 disposed between the lever 61 and a flange 64 protruding from the bolt 63.

A through hole 66 is formed in the center of the lever 61 toward the drive roll 7, and the support tube 9 is removably fitted into the hole 66.

A rotating support 93 is provided on the support tube 9 on the side of the drive roller 7, and a spherical pressure member 8 is provided between the support 93 and the drive roller 7. A wire that fits into the groove 71 and passes through the guide groove 72 is gripped by the roller 7 and the pressure member 8.

The rotation receiver 93 is constructed by disposing a plurality of balls 91 in an annular retainer 92 so as to be freely rotatable, and is supported by a push tube 94 slidably disposed in the support tube 9.

The push tube 94 is urged toward the drive roller 7 by a spring 95, and the spring pressure of the spring 95 can be adjusted by an adjustment screw 96 screwed into the support tube 9.

FIG. 3 shows another embodiment of the rotary receiver 93, in which a spherical hole 98 is formed at the front end of a cylindrical body 97, and a plurality of balls 99 are arranged at the bottom of the hole so as to be freely rotatable. By inserting the pressure member 8 into the spherical hole 98 and slightly constricting the opening edge of the hole 98 inward, the pressure member 8 is prevented from coming off and supported freely in rotation.

The wire 11 pulled out from the reel (not shown) is passed through the correction rollers 4, 4, 4, between the drive roller 7 and the pressure member 8, and is guided to the welding torch 5.

The drive roller 7 rotates while gripping the wire between it and the pressure member, and the wire 11 is sequentially pulled out from the reel and fed to the welding torch 5.

Even if the wire is twisted due to the curling tendency when it is wound on a reel, the pressure member 8 that grips the wire 11 is spherical and is arranged so that it can rotate freely, so that the wire 11 can be twisted. When a rotational force is applied in the direction of untwisting, the pressure member 8 rotates while being in contact with the wire 11, allowing the wire 11 to untwist.

Therefore, the wire 1 is connected between the reel and the pressure member 8.
1 is resolved, and the wire is cut due to increased twist of the wire when passing through the pressure member 8 as in the past, or the twist at the moment of passing through the pressure member 8 is released, and the tip of the wire is twisted. It has excellent practical effects, such as being able to prevent damage from occurring.

It should be noted that the present invention is not limited to the above-mentioned configuration, and it goes without saying that various modifications can be made within the technical scope described in the claims of the utility model registration.

[Brief explanation of the drawing]

FIG. 1 is a front view, FIG. 2 is a sectional view taken along the line of FIG. 1, FIG. 3 is a sectional view of another embodiment of the rotary fitting, and FIG. 4 is an explanatory diagram of a conventional example. 7... Drive roller, 8... Pressure member.

Claims (1)

[Scope of utility model registration request] In an automatic welding device in which the wire is held between a drive roller and a pressure member and fed out to the torch side by rotation of the drive roller, the drive roller has a guide groove on its circumferential surface and is driven in conjunction with a motor to apply pressure. A welding wire feeding device in which the pressure member is a spherical body and is supported so as to be movable toward and away from the drive roller and rotatable.