| 摘要 |
A ball delivery apparatus, in particular for tennis balls (5), with a ball magazine (2), a ball firing system (3), and a feed system (6) that moves the balls (5) from the ball magazine (2) one by one to the ball firing system (3), the ball firing system (3) firing each ball in accordance with a preprogrammed firing setting that in each instance determines the speed, spin, and/or direction of each ball (5). According to the present invention, the variable feed sequence frequency of the feed system (6) is controlled as a function of the firing settings of the ball firing system (3), a time interval scale for establishing the movement of the next ball through the feed system (6) being associated with each firing setting accepted by the ball firing system (3) for firing a ball (5). The intervals between the balls can be matched to the particular ball characteristics thereby, as happens in an actual game.
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