Abstract: An actuating mechanism for angles of light of a vertical curtain, and more particularly, an actuating mechanism for adjusting angles of incoming light of a curtain having vertical slats, includes a rotating gear indirectly disposed between an interlocking gear and a driving gear thereof. The driving gear is disposed with deviation. Using an elastic clutch escape function and various diameters of the driving gear, the aforesaid structure is able to adapt to different torsion requirements for full breadth light shielding effects, as well as safe applications.