cylinder arrangement or pressure cylinder 16 is pivotably connected via a further hinge joint or hinge arrangement 17 with a fixed or stationary support 18 now at the same end of the input of infeed section 5 there is advantageously provided a roll back stop device 19 which safeguards against undesired rolling back of the trolleys 7 after they have moved onto the corresponding rail 5a of the input section as far as the construction of the trolleys 7 is concerned it will be seen that in the exemplary illustrated embodiment each such trolley consists of a supporting member 20 and the branch rods or leg members 21 and 23 which are each connected to the aforesaid supporting member 20 the rolls 9 rotatably supported by the branch rods or leg members 21 and 23 a first distance bumper rod 22 connected with the branch rod 21 and provided with a bumper guard or bumper surface 22a fig5 and a distance bumper rod 24 connected with the other branch rod 23 and provided with a bumper guard or bumper surface 24a as best seen by referring to fig7 the distance a between the bumper guard 22a and the bumper guard 24a amounts to for instance three times the bobbin gauge b fig5 and 8 the term 34 bobbin gauge 34 designating the distance from the lengthwise axis of one bobbin.