A throwing mechanism that is located at an upper part of the chassis onto which at least one weight is attached and provides throwing the weight attached thereto. A base is located at a lower part of the chassis and onto which a weight is thrown by the throwing mechanism, at least one position adjuster is located on the base and provides aligning on the base the weight thrown onto the base so that it faces the throwing mechanism, and a control unit which enables to operate the position adjuster to move the base upwards so as to re-attach the weight to the throwing mechanism, and thus to test the throwing mechanism automatically.