An apparatus and method for mounting a
valve stem to the rim of an automotive vehicle wheel includes rims being supplied in series by a conveyor to a gauging
station where the type and / or size of the rim and the location and alignment of an aperture for receiving the
valve stem is determined by a
machine vision
system. An
electronic control system directs a robotic
manipulator to grasp either the
valve stem or the rim, move the valve stem or the rim to a mounting
station, position the valve stem or the rim with respect to the other such that the aperture in the rim is in coaxial alignment with the valve stem, and insert the valve stem through the aperture in the rim. If necessary, a power-actuated nut runner, mounted on the robotic
manipulator or adjacent the mounting
station, is used to tighten a nut over the valve stem. As an alternative to the
machine vision
system, the gauging station can use a rotating table which rotates the wheel about a central axis, and an “electric eye” optical sensor directing a beam of
infrared light onto the rim. As the rim rotates through the beam, the presence or lack of a reflection of the
light beam is used to detect the location of the aperture, and rotation of the table is stopped when the aperture is in alignment with the beam. A probe mounted on the gauging station can be extended to project into the aperture to confirm that the aperture is at the desired position and reposition the rim slightly to provide a precise positioning of the aperture.