Abstract: A compound bow comprises a bow handle that a user holds with his or her hand. A pair of bow blades are combined with both ends of the bow handle, of which at least one bow blade is rotatably combined with the bow handle. A pair of pulleys are rotatably combined with respective rear ends of the pair of the bow blades so as to rotate around a rotating axis of each pulley. A bow string extends between the pair of pulleys and is pulled for discharge of an arrow. A blade rotating unit rotates the bow blade and is rotatably combined with the bow handle, in order to adjust or release tension of the bow string by adjusting distance between the pair of the pulleys in the case of controlling the tension of the bow string or disjointing or repairing the bow.

Abstract: A compound bow comprises a bow handle that a user holds with his or her hand. A pair of bow blades are combined with both ends of the bow handle, of which at least one bow blade is rotatably combined with the bow handle. A pair of pulleys are rotatably combined with respective rear ends of the pair of the bow blades so as to rotate around a rotating axis of each pulley. A bow string extends between the pair of pulleys and is pulled for discharge of an arrow. A blade rotating unit rotates the bow blade and is rotatably combined with the bow handle, in order to adjust or release tension of the bow string by adjusting distance between the pair of the pulleys in the case of controlling the tension of the bow string or disjointing or repairing the bow.

Abstract: A compound bow reduces the force required to draw a bowstring and increases the propulsive force when shooting an arrow. The bow comprises a main body having a handle grasped, and a pair of limbs coupled to the ends of the handle; a dual pulley including a main pulley rotatably installed on a rotation shaft fixed to one end of the main body, and an auxiliary pulley having a radius greater than that of the main pulley and rotatably installed on the rotation shaft; a cam installed to the main pulley; a balance cable; a stopper member; a cam cable; a driven pulley rotatably fixed to the other end of the main body; and a bowstring.