| 摘要 |
A ball pitching device includes a pivotable pitching arm spring biased in a ball pitching direction by a spring and pivoted in a direction opposite the ball pitching direction by a rotating member engaging a cam surface of the pitching arm. The pitching arm is pivoted to a ball engaging position, and a ball to be pitched is delivered from a ball chamber for engagement by the pitching arm. After the ball is delivered for engagement by the pitching arm, the rotating member disengages the pitching arm cam surface allowing the spring to return the pitching arm toward the stop position engaging and propelling the ball in the ball pitching direction.
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