of the container determines the length by which the container is advanced at each work step this is effected by a push drive means movable in direction of arrow c in and out of contact with the containers and embodied by a feed beam 60 grasping all the containers of the conveyor section between two flanges 61 62 which protrude from its ends and displacing the containers in each instance by the length 1 in the area between turn stations 63 64 disposed at the left and right ends respectively the turn stations 63 64 are interconnected by a rotary shaft 67 so that the pivot movement can be introduced by way of a common shaft they are each provided with a turning plate 65 which has the same profile as the slide rail 56 so that the turning plate fits into the undercut slot 53 of the holders 50 the turning plate 65 is carried by a rocking lever 66 which can be swung about the horizontal rotary shaft 67 into a vertical position in the direction of arrow x in fig5 to a second or 34 vertical 34 conveyor section along which the holders 50 are displaceable in a position rotated through 90 u00b0 on a slide rail 68 carried by a frame 69 the slide rail 68 also has a profile which fits into the untercut slot 53 of each holder also the second conveyor section is provided with a feed beam 70 corresponding to feed beam 60 and being of the same design.