Adjustable roller shades

An adjustable roller shade, comprising:

• a roller shade fabric winding shaft, wherein a roller shade fabric wound on the roller shade fabric winding shaft forms an upper edge of the adjustable roller shade;
• a weight attached to a bottom of the roller shade fabric forming a lower edge of the adjustable roller shade;
• a movable pulley fixedly attached to a first end of the roller shade fabric winding shaft;
• a traction rope wound around the movable pulley, wherein the traction rope comprises an upward lifting section, a first connecting section, a downward pulling section, and a second connecting section forming a closed loop;
• and
• a first winder and a second winder, wherein the upward lifting section goes from the first winder, under the movable pulley, connects to the first connecting section over the second winder, the first connecting section connects to the downward pulling section under a second tensioning wheel, the downward pulling section goes over the movable pulley, connects to the second connecting section under a first tensioning wheel, the second connecting section connects to the upward lifting section over the first winder, forming a complete loop.