Abstract: A welding gun electrode reshaping device includes a head with satellites supported by a satellite holder to identify between them opposing seats for the gun electrode tip. The satellite holder is powered to be rotated around the seats to move the satellites around the electrode tip zone and cause reshaping of the electrode tip. In the seats there is a support member for the electrode tip with a surface designed for simultaneous smoothing of a ‘lense’ zone on the electrode tip. A movement mechanism enables positioning of the head in an operational zone.

Abstract: A plant for assembly of bodies with work stations and conveyance devices for conveying bodies between work stations. The conveyance devices include reference members assembled transitorily on the conveyance devices to support the body on the conveyance devices during transfer between work stations. Grasping devices are assembled in the work stations for grasping the reference members and positioning them accurately while temporarily disengaging them from the conveyance devices to accurately position the body supported on the reference members in the station space. The reference members include a grasping device to grasp the body and holding it steadily against them when operated by actuators assembled in the work station.

Abstract: A motor vehicle body assembly and welding station comprises a pair of facing tool (12) support conformators (11) designed to work on the body and taken between them by a conveyor system (14). The conformators are movable between a rest position in which the body is free to enter and exit the station and a work position in which the tools are near the body to work on it. At least some of the tools (12) comprise measurement means (20) for the relative position of facing body parts and the conformators have an intermediate position between said work and rest positions. On command control means (19) take the conformator into said intermediate position and activate the measurement means (20) to determine the agreement of body dimensions with predetermined measurement intervals and issue acceptance or rejection signals (22) for the body on the basis of the survey result.