Combination roller blind with fine adjustment function for shading

A combination roller blind with a fine adjustment function for shading comprised of:

• a headrail whose upper face is fixedly installed on a ceiling or a window frame and formed by a front portion and an upper portion of certain length and width joined at a right angle, wherein open side faces of the headrail are sealed by inserting side covers;
• a blind roll whose ends are rotatably fixed to a pair of fixed axes, where an axis end of each of the axis is fixed in place by a bottom end of a fixed frame whose top end is fixed to the upper portion of the headrail;
• a plurality of light-transmissive sections and a plurality of light-blocking sections are formed alternatingly in a lengthwise direction on a blind sheet, wherein one end of the blind sheet is fixed to the blind roll for winding or unwinding, and the other end of the blind sheet is fine-adjustably fixed to a rearward face of the upper portion of the headrail to allow winding or unwinding;
• a weight installed at a U-shaped bottom curve of the blind sheet guides the rising of the blind sheet and maintains tension thereof when the blind roll is rotated;
• a fine-adjusting means installed to span the rearward face of the upper portion of the headrail, the other end of the blind sheet fixed there to, wherein the fine-adjusting means to be wound or unwound and be rotated a certain distance to fine-adjust the blind sheet so that one or more of the light-transmissive sections overlap and then one or more of the light transmissive sections do not overlap as the fine-adjusting means is wound or unwound;
• a roller assembled to wrap around the fixed axes to rotate the blind roll to move the blind sheet;
• and
• an adjusting cord is provided as a loop-type cord which wraps around the circumference of the roller to raise or lower the blind sheet,
• wherein the fine-adjusting means is comprised of:
• an adjustment housing is provided as a hollow tube whose upper edge is fixed to a rear section of the upper portion of the headrail, and on which a downward-inclined lower portion facing the front portion of the headrail is cut out over a certain distance in a circumferential direction;
• a fine-adjustable winding bar is provided as a hollow tube whose internal space is divided into two parts, each internal space of the two divided parts of the fine-adjustable winding bar has a cut-out, wherein a certain length of the blind sheet is fixedly inserted into either of the cut-outs so that the fine-adjustable winding bar may be rotated to wind or unwind the blind sheet around the fine-adjustable winding bar;
• an adjusting hole penetratingly formed through a rearward top corner of one of the side covers communicates with the internal space of the adjustment housing;
• and
• a fine-adjusting tool fixedly inserted into the adjusting hole such that one end of the fine-adjusting tool is inserted into the internal space of one of the divided parts of the fine-adjustable winding bar opposite the space into which the blind sheet is inserted, and the fine-adjusting tool is detached from the adjusting hole by a certain length and rotated to cause the fine-adjustable winding bar to rotate in interlock.