Abstract: In the course of continuous movement along a track that is essentially circular, articles undergoing an imprinting process are arranged with their longitudinal axes vertical and passed through a plurality of print stations, individual silk screen stencils at the stations being adjusted to the resulting changes in the position of the article that occur during the imprinting process as the article moves through the printing machine. The silk screen stencils are pivoted for maintaining the line of contact of the silk screen stencils with the article being printed upon on a radius of the circular track through the article being printed upon during movement of the article along the circular track.