2.11. Ball collecting system can be
operated by counterclockwise rotate canvas and
conveying belt to keep a tennis ball. The canvas
conveying belt composes of parallel metal sheet placed
at the bottom .The metal sheet is positioned 6.35 cm.
away from the belt and the distance is corresponding to
one tennis ball .The process starts from a power system
which installed with chain to move the gearwheel and
roller; as a result, the belt can keep the balls more
effectively .The machine can contain 120 to 140 balls
and the ability of a ball picking up is 80 balls per
minute as shown in Figure. 1