Patent ID: 7549458

Claim:
An automatic winding device of a roll screen, comprising: a fixing shaft formed with a washer recess at a front portion and a supporting plate at a rear portion, the supporting plate having a coupling recess; a feeding member mounted around the fixing shaft, the feeding member being formed with a coupling protrusion at an outer surface of a rear portion, teeth at a front end, and a guiding slot near the teeth; a first spring mounted inside the rear portion of the feeding member; a second spring mounted at a front of the fixing shaft, the second spring being formed with a connecting bar inserted in the guiding slot of the feeding member; a fixing ring mounted at the front of the fixing shaft, the fixing ring being formed with coupling pieces and a coupling slit provided between the coupling pieces into which the connecting bar of the second spring is inserted; a rotating member formed with slanted grooves at an inner surface in which the coupling protrusion of the feeding member is fitted and a sprocket having a plurality of ball recesses at an outer surface; and a housing mounted around the rotating member, the housing being formed with wings at an outer surface and teeth at an inner surface of a front portion.