Patent ID: 7571874

Claim:
A wire winding device comprising: a case defining a first receiving groove, a second receiving groove, and a sliding channel communicating the first receiving groove with the second receiving groove; a reel received in the case and configured for winding a wire thereon by rotation of the reel in a winding direction perpendicular to an axial direction of the reel, the reel comprising at least one guiding protrusion configured for alternatively shifting into the first receiving groove and the second receiving groove by guidance of the sliding channel; a restricting member arranged on the case and configured for hindering/releasing the reel; and a resilient member configured for interconnecting the case and the reel and tending to rotate the reel in the winding direction and being movable with the reel in the axial direction of the reel when the reel starts to rotate; wherein the reel is movable in the axial direction between a first position where the at least one guiding protrusion passes through the sliding channel from the first receiving groove into the second receiving groove and the restricting member blocks the reel from rotating in the winding direction but allows the reel to rotate in an unwinding direction counter to the winding direction to unwind the wire, and a second position where the at least one guiding protrusion passes through the sliding channel from the second receiving groove into the first receiving groove and the restricting member releases the reel to allow the reel to freely rotate in the winding direction during resilient release of the resilient member.