Patent ID: 7360574

Claim:
A device for controlling a blind comprising a vertically-deployable panel made up of horizontal slats supported by ribbon ladders and terminated by a horizontal bottom end bar of position that is determined by means of at least two cords suitable for being wound on a horizontal driven roller of a top module that transforms rotary movement of a horizontal drive roller into rotary movement in a determined direction of said horizontal driven roller, wherein said top module comprises first and second epicyclic gear trains disposed in series, each gear train presenting a set of parallel-shafted planet gears meshing with a respective ring disposed around a rotary planet carrier, the planet carrier of one of said gear trains receiving one of the ends of said shafts, while the planet carrier of the other one of said gear trains receives the other ends of said shafts, the direction of rotation of the planet gears of one of said gear trains being reversed relative to that of the planet gears of the other one of said gear trains by mutual meshing, the planet gears of the second rotary planet carrier being rotated by the horizontal drive roller, while the second rotary planet carrier is constrained to rotate with the horizontal driven roller.