At Infinity, we manufacture three types of roller conveyors including, powered roller conveyors, power & free roller conveyors, gravity roller conveyors. 1. Powered roller conveyors – These conveyors are driven by the chain and modular construction is standard with an adjustable leg support that eases installation and leveling on site. 2. Gravity roller conveyors – In this type, the material that needs to be conveyed moves down due to gravity over the roller bed.