| 摘要 |
An automatic lifting device of a roll screen is provided to operate conveniently by automatically moving up the roll screen with pulling a ball chain and automatically stopping the roll screen with releasing the ball chain, and to cut down manufacturing cost by simplifying structure. An automatic lifting device of a roll screen includes a fixing shaft(20) having a support plate(23) with a washer groove(21) and an assembling groove, a transfer unit(30) having an assembling projection(31), a gear(32) and a guide groove(33), an elastic spring(40) installed in a rear part of the transfer unit, a stopper spring(50) installed in front of the transfer unit, a fixing ring(60) having an assembling sill(62) with a fixing groove(61) in which a fitting sill(51) is inserted, a rotating unit(70) having an inclined groove and a sprocket(73) with plural ball grooves(72), and a cover(80) having a fitting blade(81) and a gear. An auxiliary ring is installed in front of the stopper spring, and a fixing blade is formed in the auxiliary ring.
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