by varying the relative speeds of the conveyors forming the series

Full Title

Article or material-handling devices associated with conveyors; Methods employing such devices > Devices influencing the relative position or the attitude of articles during transit by conveyors (during feeding B65G47/14) > arranging the articles, e.g. varying spacing between individual articles > during transit by a series of conveyors > by varying the relative speeds of the conveyors forming the series