Winding mechanism of blind

A winding mechanism mountable at a groove of a head rail of a blind, the blind further including a bottom stiffener strip and a sheet of drapery material coupled between the head rail and the stiffener strip, comprising:

• a cord reel provided on the head rail;
• a line having one end tied off at a first position of the stiffener strip, passed one side of the sheet of drapery material, the head rail, and the other side of the sheet of drapery material, and having the other end tied off at a second position of the stiffener strip, the other end of the line formed as a bight section proximate the cord reel;
• a cord wound around the cord reel and coupled to the bight section of the line;
• a first drum rotated with the cord reel;
• a second drum;
• a tape spring interconnected the first drum and the second drum, the spring including two worm sections together formed an S, the spring adapted to exert a force to support the weight of the sheet of drapery material wherein in a downward pulling of the stiffener strip the cord reel rotates to release the line and the cord for lowering the sheet of drapery material with one worm section being further wound and the other worm section being loosened as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from a fully raised position to a fully lowered position in response to stopping the cord reel;
• and
• a retaining member including an elongate seat engaged with a bottom surface of the stiffener strip, and two upwardly curved snapping edges along front end rear edges of the seat for clamping the stiffener strip;
• wherein in an upward pulling of the stiffener strip the cord reel rotates in an opposite direction to wind the line and the cord for lifting the sheet of drapery material with one worm section being loosened and the other worm section being further wound as a counterweight of the sheet of drapery material so as to reach a balance, thereby maintaining the sheet of drapery material at any one of a plurality of positions from the fully raised position to the fully lowered position in response to stopping the cord reel.