| 摘要 |
An adjustable pitching machine is disclosed which generates a rise ball, or a drop ball, or a curve, or a slider, or a forkball, or a fastball, or other suitable pitches, or to produce a ground ball with or without topspin or side spin, or a fly ball with or without topspin, or side spin for fielding and fly ball practice. The pitching machine may also pitch tennis balls without topspin or sidespin to a tennis player during practice. The pitching machine may include a shield to prevent the hitter, or fielder or tennis player from observing the settings of the pitching machine and preparing for the next pitch prior to pitch delivery.
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