Patent ID: 6910516

Claim:
A take-up drive mechanism for a blind comprising: a) a drive shaft adapted to be rotatably located in a head rail of the blind; b) a worm gear unit adapted to be located between the drive shaft and a slot tilt rod of the blind; c) a transmission amplifier adapted to be located between the drive shaft and the slot tilt rod of the blind; d) a cut-off block having a slide piece extending outwardly on an exterior thereof, the drive shaft being slidably inserted through the cut-off block; and e) a cord retracting reel having: i) a through hole; ii) a plurality of cut-off grooves; and iii) an external thread, wherein the cut-off block being inserted into the through hole of the cord retracting reel, the slide piece being inserted into the cut-off grooves, the thread having a reel cord of the blind wound thereon to selectively adjust a height of slats of the blind, the cord retracting reel having a rotation controlled by a rotation of the drive shaft.