| 摘要 |
A generally improved oscillator for a ball throwing machine is provided wherein the ball throwing machine is mounted on a flat frame member and the drive mechanism of the ball throwing machine is used to actuate a cam, causing the frame member to oscillate. The frame is a rectangular vertically positioned plate extending substantially the length of one of the members forming a T-shaped base. The plate is pivotally mounted to the base through a stub shaft on the base member. The plate has a rotatable camming sprocket that engages a cam follower on the base member to cause oscillation of the plate with respect to the base. A ball magazine is mounted on top of the plate. The magazine feeds balls to a ball throwing arm. There is a spring on the base that biases the rotatable camming sprocket into engagement with a cam follower. The ball throwing machine is wheel mounted. |
