[GeeTwo]

Our rookie robot (Rebound Rumble) had a polycord elevator/conveyor to pick the balls up from the floor, raise them about two feet, then laterally another foot or so to drop it into the trigger cup (a PVC end cap mounted on a pneumatic cylinder), which would then lift the balls into the shooter wheels. We did both runs from the same motor, running (IIRC) four strands of polycord vertically and three horizontally. Thes ran on shafts with notches made by gluing short segments of foam tubing (insulation, I believe) with even shorter gaps between them. The polycord ran behind the balls on the lift and under the balls on the lateral run. We had sheet plastic (lexan?) as the opposite wall for the balls to roll up and over.