a self - service change redemption machine has a coin hopper area for receiving batches of mixed coinage and a powered mechanism for transporting them to an intake opening into the machine for sorting , counting and directing coins into a plurality of coin receptacles . the transport mechanism has a pivotable cover for preventing access to a portion of the feed path leading into the machine and , if the cover is lifted , the powered mechanism will be stopped . the mechanism is designed to prevent jamming of the coins in the hopper area or along the feed path .