Patent ID: 7819143

Claim:
A wire reel utilized in a reinforcing bar binder comprising a control circuit and a storing chamber provided in a main body of the reinforcing bar binder for mounting the wire reel around which a wire for binding a reinforcing-bar is wound, the wire being twisted for binding the reinforcing bar after it is wound around the reinforcing bar, wherein the storing chamber is provided with a first detecting apparatus and a second detecting apparatus; the wire reel is provided with a first to-be-detected portion and a second to-be-detected portion coupled to the control circuit; the first to-be-detected portion is detected by the first detecting apparatus to detect an amount of rotation of the wire reel; and the second to-be-detected portion passing the second detecting apparatus during the amount of rotation of the wire reel detected by the first detecting apparatus is counted by the control circuit, wherein the wire reel is provided with a flange and a round concave portion formed on a central portion of the flange, and the first to-be-detected portion is formed on the flange and the second to-be-detected portion is housed within the round concave portion.