JP2000197975A - Welding gun - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a defect disabling energizing when striking a duct pin into a duct by a welding gun and when a pin is rotated depending of a striking condition. SOLUTION: A bearing for electrode is arranged to the center part of a magnet base embedding a permanent magnet to the head part of a welding gun, an electrode shaft 6 wound with a coil spring is inserted into the bearing for electrode, the head of the electrode shaft 6 is extendably slightly protruded, the other end of the electrode shaft 6 is connected to a bellow arranged in a welding gun body, the other end of the electrode 6 is engagedly/disengagedly connected to a microswitch operating rod.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding gun used for welding duct pins and the like.

[0002]

2. Description of the Related Art Conventional welding guns for ducts have been constructed using a plate spring-like power supply contact. If the pin is rotated by a slight amount, the power cannot be supplied.

[0003] Further, due to its structure, a fixed shaft is provided, so that it has a drawback such that a dash force is not applied at the time of hitting the pin.

[0004]

Means for Solving the Problems and Embodiments An electrode bearing is provided at the center of a magnet pedestal having a permanent magnet embedded in the head of a welding gun, and an electrode shaft on which a coil spring is wound is fitted to the electrode bearing. The head of the electrode shaft 6 is slightly protruded so as to be able to move in and out, and the other end of the electrode shaft is movably fitted in a bellows provided in the body of the welding gun. The end is configured to be freely detachable from the micro switch operating rod.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. An electrode bearing 4 is provided at the center of a magnet base 3 having a permanent magnet 2 embedded in a head 1 'of a welding gun 1. An electrode shaft 6 around which a coil spring 5 is wound is fitted on the bearing 4, and the head 6 'of the electrode shaft 6 is protruded by the width of the clearance a so that the head 6' of the electrode shaft is within the dimension of the clearance a. Is configured to be movable, the other end of the electrode shaft 6 is connected to a bellows 7 provided in the body of the welding gun 1, and the end of the electrode shaft 6 is configured to be detachable from the micro switch operating rod 8. It is at least composed.

In the drawing, reference numeral 9 denotes a fitting concave portion which is fitted when the head 6 'of the electrode shaft 6 coming in and out is pressed by the duct pin 10, reference numeral 11 denotes a micro switch, reference numeral 12 denotes a pressure spring, and reference numeral 13 denotes a pressurizing spring. A pressure spring adjustment nut, 14 is a stopper, 15 is a handle of a welding gun, 16 is a power supply section provided on both sides to improve the energizing effect, and 17 is a pressure adjustment knob.

[0007]

As described above, according to the present invention, only one electrode shaft 6 is provided at the center, and the head 6 'of the electrode shaft is configured so as to be able to move in and out as the duct pin 10 presses it. The head is immersed in the recess 9 and the duct pin 10 is attracted to and adhered to the permanent magnet 2 provided on the magnet pedestal 3 so that the duct pin does not rotate around, so that the energization of the duct pin is stopped or the spark is stopped. Not only can the casting be performed in an ideal condition without generation, but also the power can be supplied directly through the bellows 7 with a completely new idea in place of the fixed shaft, so not only the power supply plate becomes unnecessary, but also Since a fixed shaft is not required, there is an extremely remarkable effect that the dash force and the instantaneous force at the time of hitting the pin are good.

[Brief description of the drawings]

FIG. 1 is an explanatory view in a state where an internal structure is exposed.

FIG. 2 is an explanatory view showing an internal structure exposed, an upper half in an unpressurized state, and a lower half in a pressurized state.

FIG. 3 is a partial explanatory diagram.

FIG. 4 is a partial explanatory view in a use state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Welding gun 1 'Head of welding gun 2 Permanent magnet 3 Magnet base 4 Electrode bearing 5 Coil spring 6 Electrode shaft 6' Head of electrode shaft a Clearance 7 Bellows 8 Micro switch operating rod 9 Depression 10 Duct pin 11 Micro switch 12 Pressure spring 13 Pressure spring adjustment nut 14 Stopper 15 Welding gun handle 16 Power supply unit 17 Pressure adjustment knob

Claims (1)

[Claims] An electrode bearing is provided at the center of a magnet pedestal in which a permanent magnet is embedded in the head of a welding gun, and an electrode shaft on which a coil spring is wound is fitted around the electrode bearing. The head is configured to protrude slightly so that it can freely enter and exit, the other end of the electrode shaft is connected to a bellows provided in the body of the welding gun, and the other end of the electrode shaft is configured to be detachable from the micro switch operating rod. Welding gun characterized by the following.