Patent ID: 8534587

Claim:
An automatic positioning winder comprising a lower cover ( 1 ), an upper cover ( 2 ) fixed to said lower cover ( 1 ), a winding device provided between said lower ( 1 ) and upper covers ( 2 ), entering and outgoing line holes ( 10 , 11 ) formed in the lateral walls of the lower and upper covers respectively; characterized in that: said winding device consists of a central pillar ( 34 ) provided in center of an upper portion of the lower cover ( 1 ), a turning wheel ( 4 ) sleeved on the central pillar ( 34 ), a brake component ( 50 ) provided in the upper portion of the lower cover ( 1 ) and a vulture spring ( 6 ) fixed inside of the turning wheel ( 4 ); an annular groove ( 7 ) having a flat bottom is formed on the bottom portion of the turning wheel ( 4 ); said annular groove ( 7 ) includes a positioning device ( 8 ) for forming a guiding groove ( 9 ) inside the annular groove ( 7 ); the brake component ( 50 ) has a hook portion ( 500 ) moving relatively along said guiding groove ( 9 ) as the turning wheel ( 4 ) rotating; said guiding groove ( 9 ) includes a flat bottom and the hook ( 500 ) of said brake component moves along the lateral wall of the guiding groove ( 9 ) to change its moving direction; a circular convex portion ( 14 ) and a wedge shape convex portion ( 15 ) are provided in the guiding groove ( 9 ), forming an outer raceway ( 17 ) and an inner raceway ( 18 ); said circular ( 14 ) and wedge shape ( 15 ) convex are spaced by an inlet channel ( 19 ) and an outlet channel ( 20 ), and an end of the wedge shape convex ( 15 ) includes a concave opening ( 21 ) connecting the outlet channel ( 20 ); a turning radius (R 1 ) of said inlet channel ( 19 ) is greater than a turning radius (R 2 ) of an inner side of a tip end of the opening ( 21 ) and a turning radius (R 3 ) of the concave opening ( 21 ) is greater than a turning radius (R 4 ) of an inner side of a tip end of said circular convex ( 14 ), which is close to said outlet channel ( 20 ).