Drive device for vertical window blind

A drive device for a vertical window blind, comprising:

• a driving connecting rod having a receiving pin and a first connecting portion, the receiving pin being provided at one end of the driving connecting rod, and the first connecting portion being provided at the other end of the driving connecting rod, wherein the receiving pin is used to receive a window blind operating device so as to axially rotate in a vertical direction by a rotational driving force from the window blind operating device;
• a driving screw rod having a second connecting portion and a driving screw gear, the second connecting portion being provided at one end of the driving screw rod, the driving screw gear being formed on a peripheral surface of the driving screw rod, wherein the second connecting portion of the driving screw rod is connected with the first connecting portion of the driving connecting rod so that the driving screw rod is driven by the driving connecting rod to axially rotate in the vertical direction;
• and
• an open-and-close transmission rod having an open-and-close transmission screw gear, wherein an open-and-close transmission output joint is provided at one end of the open-and-close transmission rod, the open-and-close transmission screw gear is formed on a peripheral surface of the open-and-close transmission rod, the open-and-close transmission screw gear is engaged with the driving screw gear in a manner that a vertically axial rotation is converted to a horizontally axial rotation so that the open-and-close transmission rod is driven by the driving screw rod to axially rotate in a horizontal direction, and the open-and-close transmission output joint is used for connecting with a slat open-and-close control screw of the vertical window blind to drive the slat open-and-close control screw to axially rotate in the horizontal direction,
• wherein the driving connecting rod drives the slat open-and-close control screw to axially rotate in the horizontal direction by the rotational driving force from the window blind operating device, and thereby the slat open-and-close control screw rotates to horizontally open or horizontally close a plurality of slats slidably disposed on the slat open-and-close control screw.