Purpose of Use and Operation Overview

An arm shaft is attached with an eccentric plate connected to a spring and a sprocket (with built-in bearing) which receives rotation from the reducer. The sprocket has a notch (claw) which hits the notch (claw) at the end of the arm and pushes the arm upward. During this period, the cam clutch is overrunning. As the arm shaft rotates, the spring gradually extends. When the arm passes the top dead center, the spring suddenly starts contracting. At this point, the arm throws the ball. After the throw, when the arm reaches the point of degree θ shown below, it suddenly starts reversing due to the contraction force of the spring. The cam clutch then engages to prevent reversing. The arm is held at the stop position and is ready for the next throw. The reverse torque which works during the process involves impactive vibration. A cam clutch with sufficient capacity for such a torque is required.