Blind body positioning mechanism for non pull cord window blind and window blind using the same

A blind body positioning mechanism used in a non pull cord window blind, comprising:

• a transmission unit comprising a casing, two first transmission wheels, a coil spring, two second transmission wheels and at least two transmission cords;
• said two first transmission wheels being rotatably mounted in said casing and meshed with each other, said coil spring being connected between said two first transmission wheels and selectively wound round one said first transmission wheel, said two second transmission wheels being rotatably mounted in said casing and respectively meshed with said first transmission wheels, and said transmission cords respectively fixedly connected to said second transmission;
• said transmission cords wound round said respective second transmission wheels due to rotation of the respective said second transmission wheel;
• and
• a damper unit comprising a damping reel holder, a damper and a damping reel, said damper comprising an oil reservoir and a brake gear;
• said oil reservoir being fixedly mounted in said damping reel holder, said brake gear being pivotally mounted on said oil reservoir, said damping reel being wound with at least one said transmission cord, which is from one said second transmission wheel, said damping reel having one end thereof pivotally connected to said damping reel holder and an opposite end thereof provided with a toothed coupling hole;
• said toothed coupling hole being engaged with said brake gear of said damper;
• wherein the damper provides a damping resistance that is in static balance with an elastic restoring force of the coil spring.