Impacting limiting device for resistance Spot, Projection or roller welding machines actuated by an electrical actuator

摘要

An impact limiting device for resistance spot, projection or roller welding machine, with actuation by an electrical actuator controlled by an electronic control unit, of the type that comprises a fixed arm (4) and a movable arm (5) provided with respective electrodes (7) that can be clamped onto the parts to be welded (8), characterized in that it comprises elastic means (11), interposed between the movable arm (5) and the electrical actuator (9), which are preloaded with a force that is slightly greater than the maximum working force of the welding machine (2) and are suitable to limit, in abnormal welding conditions, the maximum mechanical stress on the arms (4, 5) and the actuator (9) for a time interval sufficient to allow the unit to restore the correct working force.