Abstract: An automatic throwing machine (10) includes a throwing arm (18) rotated by a worm gear (78) driven by a worm (76) carried on a rod (42). The rod is driven by an electric motor (32). An extension spring (68) is extensible as the arm is moved to store energy in the spring and create a torque on the throwing arm. The arm is configured for objects such as clay pigeons (P), baseballs (B), and hockey pucks (H) and the like. When the spring reaches an over-center position, the throwing arm is rapidly rotated to launch the object along a desired trajectory. A control (112) controls operation of the motor. A passive infrared detector (110) identifies people (X) near the device and controls the direction of discharge of the object so the object is thrown toward, or away from, the person depending upon the object being thrown. The detector further provides an interlock to prevent object release if there is a person in the direction the object is thrown who should not be there.