| 摘要 |
A machine for pitching baseballs includes two discs which are mounted on independently rotatable shafts. The discs have urethane at their peripheries. The spacing between the shafts can be adjusted in order to set the width of a gap between the discs. A ball feed mechanism inserts balls into the gap between the discs, which then fling the balls outward in a pitching style which depends upon the orientation of the pitching machine and the relative rotational speeds of the discs. In one embodiment, the ball feed mechanism employs a tubular feed body having a tapered outlet end which is positioned adjacent the gap. A piston in the feed body reciprocates to push the balls out. In another embodiment, the ball feed mechanism is mounted on a chassis having casters and is connected via a flexible hose to a feed nozzle positioned adjacent the gap. A reciprocating slider transfers balls from a storage chamber to an inverted-T tube arrangement, whence they are blown pneumatically through the hose to the feed nozzle.
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