Purpose of use and operation explanation

The arm shaft is fitted with eccentric disk connected to a spring and a sprocket (with built-in bearing) that is rotated by a reducer. The sprocket has a notch (claw) that hits a notch (claw) on the end face of the arm and pushes the arm up. During this time, the cam clutch is running idle.
The spring gradually expands as the arm rotates, and when it passes the top dead center, it begins to contract rapidly, at which point the arm releases the ball.
After the pitch is finished, when the arm reaches the angle θ shown below, the contraction force of the spring causes it to suddenly reverse, but the cam clutch engages to prevent this. The arm is stopped at the stopping position, allowing the pitcher to immediately begin the next pitching motion. The reversing torque that acts at this time is a torque that accompanies shocking vibrations, and a cam clutch is required to counter this.