Motor-driven X-type resistance spot welding gun

Details Motor-driven X-type resistance spot welding gun Motor-driven X-type resistance spot welding gun

1996-08-23

1998-05-12

Nguyen, Matthew V.

Electric heating

Metal heating

For bonding with pressure

B23K 1100

Patent

active

057509530

ABSTRACT:
A motor-driven X-type resistance spot welding gun. A servo-controlled motor torque is converted into force to drive gun arms and into electrode force by using a reduction gear without converting rotational output of the motor into rectilinear motion. The two arms are respectively attached to an output shaft of the reduction gear or a case, and the rotational output of the motor can be converted into swing-wise movement to close and open the arms. The electrode tips on the arms nip a workpiece to apply electrode force to the workpiece, and current is passed through the workpiece to perform spot welding. A motor, a reduction gear and the like are assembled on a common base to form a driving unit so that an arm actuator for the X-type resistance spot welding gun is formed. The same driving unit can be used commonly to various X-type gun models. The independent properties of functions of a bracket for attaching the welding gun to a robot are improved. Since properties of the arm actuator and the bracket are not dependent on a welding unit of the gun (portion through which welding current flows), the production cost for a manufacturer and maintenance cost for a user are reduced.

REFERENCES:
patent: 4531041 (1985-07-01), Larson
patent: 4551605 (1985-11-01), Numata et al.
patent: 4559438 (1985-12-01), Nakadate
patent: 4771160 (1988-09-01), Pitsch et al.
patent: 5252801 (1993-10-01), Angel et al.
Patent Abstracts of Japan, vol. 96, No. 1, 31 Jan. 1996, & JP-A-07 236981 (Dengensha Mfg. Co. Ltd.) 12 Sep. 1995, *Abstract.

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