Unlike other conventional conveyor belt systems, in which it is necessary to apply to the belt a high adherence tension with regard to the transmission drums, in the EUROBELT modular conveyor belt system, with direct and positive traction by means of sprockets, this tension must be the minimum necessary, so that the sprockets get correclty fitted to the belt to work properly.

To achieve this, it is necessary to leave the belt hanging down freely when coming out of the sprockets, once the first support roller has been surpassed, forming a hanging called catenary curve. It will act as a natural take-up, absorbing the changes in length of the belt owing to expansions and contractions. It will apply a tension fixing the belt on the teeth of the sprockets.

Then the belt can rest on return-way rollers, whose distance will be lesser than that of the first catenary, or on wearstrips.


If the conveyor length is under 2 metres, there will be just one catenary that will hang down freely all along the return way. In this case it will not be necessary to place any roller in the return way.


For conveyor lengths over 2 metres, one return roller will be placed near every shaft, at a distance ranging between 200 and 500 mm, and as many rollers as necessary in the middle, so that the spacing among them range between 850 and 1,200 mm.

In the pictures below, we show different examples regarding the arrangement of rollers in the return way to create the catenary curves.

Sometimes we can raise the return way of the belt, being reduced the dimensions of the conveyor structure.

In the construction of conveyors, the distances appearing in the chart below must be respected according to the belt Series and the size of the sprockets. Download here table in PDF format..