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, and to the second winder, the downward pulling section goes from a second tensioning wheel, over the movable pulley, and to a first tensioning wheel, the first connecting section connects the upward lifting section to the downward pulling section, and the second connecting section connects the downward pulling section to the upward lifting section.