Blind body actuator for non-cord window blind assembly

A blind body actuator for a cordless window blind assembly, comprising:

• a casing;
• a winding mechanism comprising two winding wheels and a volute spring, said two winding wheels being rotatably mounted in said casing and meshed with each other, said volute spring being connected to said two winding wheels and capable of wound around one of said winding wheels;
• two lift-cord wheels being rotatably mounted in said casing and respectively meshed one respective said winding wheel;
• two guide units being mounted in said casing and respectively disposed adjacent to said lift-cord wheels, each of said guide units comprising a first cylinder roller rotatably mounted in said casing, each of said first cylinder rollers, said winding wheels, and said lift-cord wheels having an axle respectively, and said axles of said first cylinder rollers, said winding wheels, and said lift-cord wheels being parallel to each other;
• and
• two lift cords respectively wound around said first cylinder rollers of said guide units respectively, each of said lift cords having one end thereof connected to one respective said lift-cord wheel so that each said lift cord is capable of being wound around or unwound around the respective said lift-cord wheel by the rotation of the respective said lift-cord wheels, each of said lift cords having an opposite end thereof extended out of said casing.