JP2003340576A - Seam welding head - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a welding head mechanism with a stable welding current supply structure so as to enable a metal foil to be seam welded. <P>SOLUTION: A stable power is supplied by pushing split brushes uniformly to a rotary shaft and a secondary conductor by one spring force by the shaft and a conical structure of a pushing cup. Its insulation is formed by a chemical treatment or the like so that the rotary shaft is set to a stably holding state. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seam welding head having a structure for supplying a stable welding current from a fixed secondary conductor to a rotating shaft for welding rotation, which is required when seam welding a metal foil.

[0002]

2. Description of the Related Art In a conventional seam welding head, current is collected from the outer peripheral surface of a rotating shaft that is rotating like a current collecting brush of a motor. In this structure, a plurality of spring forces bring a brush close to the entire surface of the outer circumference of the rotating shaft to supply electric power.

[0003]

In the conventional structure, the brush area can be easily increased when supplying a large current. However, with this structure, it was very difficult to make the spring forces that press each brush uniform, and this was a cause of fluctuations in the supply current. This fluctuation range can be absorbed in welding thick materials, but it was a problem in welding metal foil. The amount of power supply is slightly higher than the specified value and the welding is broken. This will be repeated.

[0004]

[Means for Solving the Problems] Since the flow of electricity is affected by the electric resistance due to the contact pressure, a structure that can make the contact force on the power supply surface uniform was sought. Therefore, as a solution when stable power supply is required like metal foil, we decided to use one spring force to give a uniform contact force to the power supply contact surface. With the conical portion on the rotating shaft side and the conical portion on the pushing cup side, the split brush is in close contact with the secondary conductor and also with the rotating shaft side.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION One spring force is used as a contact force between a secondary conductor side and a rotating shaft side by a component force of a rotating shaft and a conical portion of a push cup. With this structure, a uniform component force is supplied in all directions. In addition, the structure for fixing the rotating shaft did not use an insulating material such as a soft bake material, but the insulation of the chemical treatment was measured and it was possible to firmly fix it on the metal surface. Thus, it was possible to stabilize the welding current supplied by the uniform contact pressure.

[0006]

[Effects of the Invention] Thanks to this stable welding current, not only special materials with narrow fluctuation range of welding current can be seam welded by simple work, but also seam welding can be performed up to vacuum sealing and gas sealing of metal foil. Became.

[Brief description of drawings]

1 is a sectional view of the seam welding head of the application.

[Fig. 2] Principle of seam welding machine

FIG. 3 is a conceptual diagram of a conventional general seam welding head.

[Explanation of symbols]

Drawing-1 1 electrode plate 2 rotation axes 3 split brush 4 push cup 5 springs 6 bearing case Drawing-2 1 Upper electrode 2 Lower electrode 3 welding transformer

Claims (2)

[Claims] 1. A seam welding head having a structure in which a brush divided by a cone on a rotary shaft side and a cone on a push cup side is pressed against a secondary conductor to guide a welding current from the secondary conductor to the rotary shaft. 2. A seam welding head in which insulation of a bearing case holding a rotary shaft is formed by chemical treatment or the like.