Motor-driven X-type resistance spot welding gun
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United States of America Patent
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May 12, 1998
Grant Date -
N/A
app pub date -
Aug 23, 1996
filing date -
Aug 25, 1995
priority date (Note) -
In Force
status (Latency Note)
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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.
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