Abstract: A conveyor apparatus made up of a plurality of pairs of links which are pivotally interconnected and which are entrained around and co-operable with first and second index members to define an endless path. The index members move in synchronism at different speeds and guide means are provided to control movement of the links between the first and second indexing members. The differential speed of the indexing members results in the links moving at different speeds when on the two indexing members and this is made possible by the links pivoting so they close up with one another when on the slower moving of the two indexing members. The ability for the parts of the conveyor to move at different speeds is particularly useful for example in many types of manufacturing operations. One use of the apparatus is in arraying sheet material into a series of superimposed plies. For this purpose a plurality of rollers are provided to interconnect two of said endless chains. Thus, the rollers move in an endless path.