Image Number 4 for United States Patent #4520853.
A method and apparatus for positioning a filler opening of a drum into alignment with a filler. A wheel on the end of a probe driven by a pneumatic motor is moved in a circular path on the surface of the drum and falls into and is captured by the filler opening. The probe continues to move, rotating the drum and the filler opening toward alignment with the filler. Alignment between the probe and filler is sensed and used to reverse the direction of movement of the probe, causing it to withdraw from the filler opening.