Patent ID: 6619365
Filing Date: 2003-09-16
Classification: E06B

Abstract:
A plug-in transmission mechanism mounted in a motor-driven Venetian blind for controlling lifting of slats and bottom rail of the Venetian blind and tilting of slats of the Venetian blind, comprising at least one cord roll-up unit and a driving unit adapted to drive said cord roll-up unit, wherein said cord roll-up unit comprises:an amplitude modulation set, said amplitude modulation set comprising an amplitude modulation lift cord connected to the slats and bottom rail of the Venetian blind and adapted to lift/lower the slats and bottom rail of the Venetian blind, a support, and an amplitude modulation wheel rotatably mounted in said support and coupled to said driving unit for free rotation relative to said support to roll up/let off said amplitude modulation lift cord upon operation of said driving unit, said amplitude modulation wheel comprising a longitudinal groove; a frequency modulation set, said frequency modulation set comprising a frequency modulation lift cord adapted to tilt the slats of the Venetian blind, and a frequency modulation wheel sleeved onto said amplitude modulation wheel and adapted to roll up/let off said frequency modulation lift cord, said frequency modulation wheel comprising a notch; and a linkage, said linkage comprising a link mounted in the groove of said amplitude modulation wheel and the notch of said frequency modulation wheel to couple said frequency modulation wheel to said amplitude modulation wheel for synchronous rotation, and a stop block adapted to limit the angle of rotation of said frequency modulation wheel and to force said link away from said frequency modulation wheel when said amplitude modulation wheel rotates to a predetermined position.