Belt conveyors consists of a driving pulley at the head end, and take up pulley at the tail end, both being accommodated in a steel frame. An endless belt connects the two pulleys on both runs and supported by suitable roller type supports, called the idlers. At the upper side of the conveyor also called the carrying side, because the pay load is carried on this side, the belt is supported by idler. At the other side also called the return side because usually there is no pay load, the belt is supported by idlers. In some designs the belt is supported by a stationery runway instead of idlers. In some special installations both the upper and lower sides transport loads (usually unit load) simultaneously in opposite directions. The driving pulley receives its rotation from drive unit. The material to be conveyed is loaded on the belt by one or more feed hoppers mounted over the conveyor belt line normally placed at the tail end side. The load conveyed by the moving belt is discharged over the driving pulley into discharge spout. However discharge can be arranged at any point along the conveying run by means of special discharge devices. At the tail end side a device called the take up arrangement is attached with the take up pulley to keep the belt under a minimum tension so that the belt does not slip over the pulleys due to extension of its length. Belt cleaner removes material adhering to the outer belt face. It is usually located near the driving pulley.