can be provided in each belt system in a further preferred embodiment of the present invention in place of the single pulley 16 for use in the diversion of the plurality of belts 24 a continuous guide roller 51 may be provided which continuous guide roller 51 is extending crosswise to the direction of travel of the conveyor belts as depicted in fig9 at least one such shared guide roller 51 is provided for a plurality of tensioning mechanisms 37 in the preferred embodiment which is shown in fig9 a first guide roller 51 and a second guide roller 52 are provided for all of the tensioning mechanisms 37 the tensioning mechanisms 37 are all arranged on a single support 01 and are all fixed in place by first and second end plates 53 54 which end plates 53 54 are situated at each end in the longitudinal direction of the support 01 as seen in fig9 the two end plates 53 54 are secured to each other by the use of tie rods for example the two end plates 53 54 can also support screw connected bearings for example and especially can support roller bearings which are configured to hold the respective ends of the guide rollers 51 52 at least one of the first and second end plates 53 54 is connected to at least one coupling 57 58 for use in.