JPS6211948B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a welding gun device, and more particularly, a pair of gun arms are pivotally connected to the front end of a holding frame that holds a transformer so as to be openable and closable, and the two arms are connected to each other. The present invention relates to a welding gun device that is connected to each other via a pressure mechanism between them and operated to open and close. Conventionally, in this type of device, a pressurizing mechanism is generally placed behind the gun arm pivot position, and a transformer is placed further behind that. According to this, the pressure mechanism and the gun arm pivot position are connected. As the distance between the gun arm and the transformer becomes relatively short, a large pressure member is required to apply the desired pressure to the gun arm, and the distance between the gun arm and the transformer becomes relatively long, resulting in power loss in the current-carrying path between them. This results in the disadvantage of increased power consumption. An object of the present invention is to provide a device in which the above-mentioned disadvantages are eliminated by arranging the pressure member and the transformer in opposite positions to those of the conventional device. A pair of gun arms are pivoted to open and close,
A welding gun device in which the arms are opened and closed via a pressure mechanism between the arms,
The rear end portions of both arms sandwich the transformer placement portion and extend rearward of the placement portion, and the pressure member is disposed at the extended ends thereof.

Next, the present invention will be explained with reference to the illustrated embodiments.

In the drawings, reference numeral 1 indicates a housing-shaped holding frame rotatably supported between a pair of front and rear movable frames 2, and the holding frame 1
A pair of upper and lower gun arms 4, 4 extending forward are pivotably attached to a pivot shaft 3 horizontally installed at the front end thereof, and side plates 1a on both sides of the holding frame 1,
1a, the transformer 5 is surrounded and held by upper and lower cover plates 1b, 1b, and the terminal plates 5a,
5a are connected to the two gun arms 4, 4 through ounce copper plates 5b, 5b, respectively, and the two gun arms 4, 4 are opened and closed by a pressurizing mechanism 6 between the two gun arms 4, 4. A welding gun device was constructed. The pressurizing mechanism 6 is constructed by connecting a piston rod 6b of a cylinder 6a fixed to one gun arm 4 to the other gun arm 4. According to the present invention, both gun arms 4,
The rear end of 4 is extended rearward of the arrangement part of the transformer 5 by sandwiching the arrangement part of the transformer 5, and the pressure mechanism 6 is attached to the extended end of the arrangement part of the transformer 5.
Place.

In the illustrated gun arms 4, an arm body 4a that extends forward is bolted to a separate lever rod 4b that is pivotally supported by the pivot shaft 3, and a gun arm 4 that extends rearward is bolted to a separate lever rod 4b that is pivotally supported by the pivot shaft 3. The extension part is integrally formed.

Next, to explain its operation, according to the operation of the pressurizing mechanism 6, both gun arms 4, 4 are given opening/closing operations in conjunction with this, and welding is performed while the workpiece is clamped with a predetermined pressurizing force. In this case, according to the present invention, the transformer 5 is disposed in the pivot shaft 3 of both gun arms 4, 4, and the pressurizing mechanism 6 is disposed behind it. The distance between the pressurizing mechanism 6 and the pressurizing mechanism 6 can be relatively long, and the pressurizing mechanism 6 can be made compact with a relatively small capacity to obtain a desired pressurizing force against the workpiece.

Further, the transformer 5 is arranged close to the pivot 3,
By shortening the length of the energizing path to each gun arm 4, power loss in the energizing path can be minimized, and power consumption is reduced.

As described above, according to the present invention, the transformer is disposed behind the pivot position of the gun arm, and the pressurizing mechanism is disposed further behind the transformer, and the transformer is disposed close to the gun arm to reduce power consumption. At the same time, the pressurizing mechanism can be made small, thereby making it possible to reduce the size and weight of the device.

[Brief explanation of the drawing]

FIG. 1 is a side view of an example of the device of the present invention, and FIG. 2 is a plan view thereof. 1... Holding frame, 4... Gun arm, 5... Transformer, 6... Pressure mechanism.

Claims (1)

[Claims] 1. A welding gun device in which a pair of gun arms is pivotally attached to the front end of a holding frame that holds a transformer so that the arms can be opened and closed, and the arms are opened and closed via a pressure mechanism between the two arms. A welding gun device characterized in that rear end portions of both arms sandwich the arranging part of the transformer and extend rearward of the arranging part, and the pressure member is arranged at the extended end.