Abstract:
The present invention provides a multifunctional dual roll bind having a roll screen and a roll screen used therefor. The screen is divided into upper and lower portions, so that the entire screen blocks the light by user&#39;s manipulation; the upper portion is solely opened/adjusted while the lower portion is selectively blocked light. Simultaneously, the upper and lower portions are possibly opened partially to satisfy the user&#39;s demands. The roll screen of the present invention comprises: a first adjustment unit forms on a starting part; a third adjustment unit forms on an ending part; a second adjustment unit forms between the first adjustment unit and the third adjustment unit. The first adjustment unit has alternatively formed the first translucent mesh part and the sight and light blocking part with a predetermined range and width; the third adjustment unit has alternatively formed the third translucent mesh part and the sight and light blocking part with a predetermined range and width; and the second adjustment unit has alternatively formed the second translucent mesh part and the sight and light blocking part with a predetermined range and width, which is at least two times wider than the first or third sight and light blocking parts.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
       [0001]    The present invention relates to a multifunctional double roll blind having a roll screen and a roll screen used therefor. More particularly, the multifunctional double roll blind having a roll screen and a roll screen used therefor is divided into an upper side and a lower side, which can be independently opened and closed by a single double roll blind manipulation. Thereby, the variously implementing opening and closing of the blind is operated in response to user&#39;s choice. 
       2. Description of the Related Art 
       [0002]    In general, the curtains and blinds are installed at the windows or entrance of a building to purposely use for blocking the light, blocking the outside sight, preventing the noise, and preventing the cold. In addition to this practicality, the curtains and blinds are used as an important element of the interior decoration for improving the aesthetics of the interior according to a blend of colors which may be harmonized with an inner wall or glass. 
         [0003]    The blinds include a vertical blind, a venetian blind, a roman shade, a roll blind, a double roll blind, and the like. 
         [0004]    Among the blinds, the double roll blind has a form in which the fabric is rolled up by winding the roll of the upper housing, and recently, a fabric in which portions having a mesh structure (the objects on the opposite side are visible) and portions having a light-blocking structure (the objects on the opposite side are not visible) are repeatedly formed with predetermined widths has been configured and released. 
         [0005]    That is, the double roll blind adjusts the light-blocking degree according to the degree of overlapping the front fabric and the rear fabric, and for example, has a structure in which light is maximally emitted when the front mesh structure and the rear mesh structure are matched (aligned in parallel) with each other, and has a structure in which the light is entirely blocked when the front light-blocking structure and the rear light-blocking structure are mismatched with each other, thereby adjusting the light-blocking degree and fully introducing the light by entirely rolling up the fabric of the double roll blind. 
         [0006]    The fabric to be applied to such a double roll blind is fabricated by weaving through a weaving machine, mainly fabricated by a weaving machine equipped with a warp beam of which warps are wound at regular intervals, and the wefts of the mesh portion are coarsely supplied and crossed in a vertical direction in a wrap direction to have a net structure to be transparently transmitted, and the light-blocking structure portion configures the light blocking structure in which the wefts are densely supplied and crossed in a direction perpendicular to the warp direction. 
         [0007]    In recent years, as illustrated in  FIG. 1 , a double roll blind capable of adjusting a light amount and a viewing angle partially transmitted by a roll screen formed by alternately forming transparent portions and sight and light blocking part has been developed. Further, portions through which the objects on the opposite side are visible are formed by translucent mesh part  241   a , and portions through which the objects on the opposite side are not visible are formed by sight and light blocking part  241   b.    
         [0008]    However, in the double roll blind according to the first related art as described above, when the screen is almost deployed, while the upper portion implements the sight or transmission of light by user&#39;s manipulation, only the lower portion may not block the light, and thus, there is a problem in that the demands of the user are not satisfied. 
         [0009]    Meanwhile, as the second related art for solving the above problems, there are Korean Patent Application Publication No. 10-2011-0009062 (screen for roll blind and multifunctional double roll blind having roll screen) and Korean Utility Model Publication No. 20-2013-0006983 (multifunctional double roll blind having roll screen) which are developed by the present inventors. 
         [0010]    The second related art is to provide a multifunctional double roll blind having a roll screen in which a window is divided into the upper portion and the lower portion to entirely light-blocking the screen or selectively light-blocking only the lower portion by user&#39;s manipulation, thereby satisfying user&#39;s demands. 
         [0011]    In the accompanying drawings,  FIG. 2  is a perspective view illustrating a use state of a multifunctional double roll blind having a roll screen according to the second related art and  FIG. 3  is a partially cross-sectional view illustrating drivers of the multifunctional double roll blind having a roll screen according to the second related art and the present invention. 
         [0012]    As illustrated in  FIGS. 2 and 3 , a multifunctional double roll blind  200  having a roll screen according to the second related art includes a housing  210  which is fixed to a ceiling with a window or a wall surface through a fixing bracket (not illustrated) and provided so that a lower surface is opened, a winding rod  230  of which one end is rotatably connected to both sides of the housing  210  and the other end is rotatably installed via an ascending/descending means  220  to be rotatably provided so as to operating the ascending/descending means  220  in winding and unwinding directions, and a roll screen  240  of which one end is fixed and wound on the winding rod  230 , the other end is fixed to the housing  210  to be unwound and wound by rotating the winding rod  230 , thereby blocking the outside partially or entirely so as to cover the whole or only the lower portion of light or prevent the whole or only the lower portion of the inside of the interior from being viewed from the outside and enabling ventilation. 
         [0013]    Herein, on the roll screen  240 , a twist preventing member  250  is provided, in which the roll screen  240  is unwound and wound without twist by maintaining tension when the roll screen  240  is unwound from and wound on the winding rod  230  by rotating the winding rod  230  by manipulation of the ascending/descending means  220 . 
         [0014]    In more detail, the housing  210  is configured by a horizontal plate  210   a  which is fixed to the ceiling or wall surface of the window through a fixing bracket, a cover plate  210   b  which is extending downward from the front end of the horizontal plate  210   a  to cover the roll screen  240  wound on the winding rod  230 , a fixing piece  210   c  which is bent and extended upward and downward from the rear end of the horizontal plate  210   a  to fix the other end of the roll screen  240  fixed and wound on one end to the winding rod  230 , and left and right fixing pins  210   d  and  210   e  of which one end is fixed to both ends of the horizontal plate  210   a  through a screw and a lower end is integrally formed with a bent piece (not illustrated) bent inward so that the ascending/descending means  220  is installable to rotate the winding rod  230  by user&#39;s manipulation by connecting one end of the winding rod  230  and the other end of the winding rod  230 . 
         [0015]    The ascending/descending means  220  is a conventional general well-known technique which is installed on the inner surface of the right fixing member  210   e  to rotate the winding rod  230  according to the user&#39;s manipulation, and the description thereof will be briefly described as follows. 
         [0016]    That is, the ascending/descending means  220  is configured by an ascending fixing piece  220   a  which is fixably provided by penetrating the bent piece of the right fixing piece  210   e  to the center so as to be installed in the inside of the right surface of the housing  210 , an ascending rotation piece  220   b  of which one end is rotatably provided at the ascending fixing piece  220   a  and locking holes (not illustrated) are formed in a circumferential direction at regular intervals on the outer circumferential surface, and an ascending/descending driving rope  220   c  which winds the outer circumferential surface of the ascending rotation piece  220   b  to rotate the ascending rotation piece  220   b  in response to user pulling in one direction and the other direction. 
         [0017]    The winding rod  230  is formed to have a circular section, and one end is rotatably connected to a bent piece (not illustrated) of the left fixing piece  210   d  of the housing  210  through a hinge piece (not illustrated) and the other end is fixed and connected to the ascending rotation piece  220   b  of the ascending/descending means  220 , and a cutting groove  230   a  for inserting and fixing one end of the roll screen  240  is cut in a longitudinal direction on the outer circumferential surface. 
         [0018]    The roll screen  240  is configured by adjustment units  241  in which mesh portions  241   a  and sight and light blocking part  241   b  in which portions through which objects on the opposite side are visible and portions through which objects on the opposite side are not visible are alternately repeated at a predetermined range with a predetermined width are formed at the upper portion and the lower portion with respect to the entire length, and a blocking portion  242  which is formed between the adjustment units to block the outside. The adjustment units  241  of the roll screen  240  formed at the upper portion and the lower portion are wound on the twist preventing member  250  to entirely block the light or block only the lower portion by partially or entirely blocking the outside in response to operating the ascending/descending means  220  in unwinding and winding directions as illustrated in  FIGS. 2 and 3 , thereby preventing the inside of the interior from being seen from the outside from the whole or middle portion to the lower portion. Accordingly, the lengths of the adjustment units  241  formed at the upper portion and the lower portion of the entire length are the same as each other by about ¼, and the blocking portion  242  is formed in a section of about 2/4 obtained by subtracting the lengths of the adjustment units  241  formed at the upper portion and the lower portion from the entire length. 
         [0019]    That is, the roll screen  240  is formed at a section of about ¼ of the lengths of the upper portion and the lower portion with respect to the entire length and the blocking portion  242  is formed in a section of about 2/4 with respect to the entire length. 
         [0020]    In more detail, the roll screen  240  is configured by a first adjustment unit  241 ′ formed at the start portion in the entire length direction, a second adjustment unit  241  formed at the end portion, and a blocking portion  242  formed between the first adjustment unit  241 ′ and the second adjustment unit  241  to block the outside. The first adjustment unit  241 ′ and the second adjustment unit  241  of the roll screen  240  formed at the start portion and the end portion are wound on the twist preventing member  250  to entirely block the light or block only the lower portion by partially or entirely blocking the outside in response to operating the ascending/descending means  220  in unwinding and winding directions or preventing the inside of the interior from being seen from the outside from the whole or middle portion to the lower portion. Accordingly, the lengths of the first adjustment unit  241 ′ and the second adjustment unit  241  formed at the start portion and the end portion of the entire length are the same as each other by about ¼, and the blocking portion  242  is formed in a section of about 2/4 obtained by subtracting the lengths of the first adjustment unit  241 ′ and the second adjustment unit  241  formed at the start portion and the end portion from the entire length. 
         [0021]    Meanwhile, the blocking portion  242  is integrally formed by weaving the adjustment units  241  by weaving as described above, but is not limited thereto, and the blocking portion  242  is woven to correspond to the width of the woven roll screen so that the both ends thereof are fixed to the screen in which the translucent mesh part and the sight and light blocking part are alternately woven through a fixing means or fusion or sewing. 
         [0022]    After the multifunctional double roll blind having the roll screen according to the second related art configured as such is fixed to the ceiling of the window, when the roll screen  240  of the roll blind  200  intends to be adjusted to block the light or prevent the inside of the interior from being seen from the outside and enable ventilation, as illustrated in  FIG. 2  of the accompanying drawings, first, the user grips the ascending/descending driving rope  220   c  of the ascending/descending means  220  and pulls the driving rope  220   c  downward. 
         [0023]    When the ascending/descending driving rope  220   c  is pulled downward, the ascending rotation piece  220   b  of the ascending/descending means  220  is rotated, and as a result, the winding rod  230  having one end and the other end rotatably mounted on the housing  210  and the ascending/descending rotation piece  220   b  is rotated in one direction, that is, in a direction in which the roll screen  240  wound on the winding rod  230  is unwound. 
         [0024]    The roll screen  240  is tensioned downward by the self-weight of the twist preventing member  250  in response to the rotation of the winding rod  240  and unwound without twist. 
         [0025]    As such, by using the roll screen  240  wound on the winding rod  230  while the roll screen  240  is unwound from the winding rod  230 , when the upper portion of the window may be provided to see light, outer air, and the outside and the lower portion is blocked not to see the outside, the user gripes the ascending/descending driving rope  220   c  and pulls the driving rope  220   c  downward, and thus, the blocking portion  242  of the wound roll screen  240  is positioned at the lower portion of the roll screen  240 , and then as illustrated in  FIG. 2 , the upper portion of the window can see the light, outer air, and the outside and the lower portion is blocked not to see the outside. 
         [0026]    Further, when the user gripes the ascending/descending driving rope  220   c  and pulls the driving rope  220   c  downward, the adjustment units  241  and the blocking portion  242  may block the entire window. 
         [0027]    That is, when the roll screen  240  is fully wound, the window is fully opened, when the roll screen  240  is unwound only by ¼ or less, the light-blocking degree of only a part of the upper portion is adjusted and the rest is fully opened according to the degree of overlapping of the translucent mesh part and the sight and light blocking part of the first adjustment unit at the start portion. In addition, when the roll screen  240  is unwound by ¼ or more, the light-blocking degree is entirely adjusted according to the degree of overlapping of the translucent mesh part and the sight and light blocking part of the first adjustment unit at the start portion and the sight and light blocking part, and when the roll screen  240  is almost unwound, the middle portion to the lower portion are blocked by the light-blocking portion or the light-blocking degree from the middle portion to the upper portion is adjusted according to the degree of overlapping of the first adjustment unit at the start portion and the second adjustment unit at the end portion. 
         [0028]    As such, the multifunctional dual roll blind having the roll screen of the second related art can use the roll screen as desired by user&#39;s manipulation, thereby satisfying the user&#39;s demands. 
         [0029]    However, in the multifunctional double roll blind having the roll screen according to the second related art, there is one limitation, and it is common to block the lower portion in the interior and adjust lighting of the upper portion, but when only the lower portion is desired to be partially opened (for example, if the user wants to look outside while sitting on a chair), there is no way to deal with the case. 
       SUMMARY OF THE INVENTION 
       [0030]    The present invention has invented in an effort to provide a multifunctional dual roll bind having a roll screen and a roll screen used therefor, in which the screen is divided into upper and lower portions such that the entire screen can be blocked the light by the user&#39;s manipulation or the upper portion can solely be opened/adjusted while only the lower portion is selectively blocked the light, and the upper and lower portions can be partially opened at the same time, thereby further satisfying the user&#39;s demands. 
         [0031]    An aspect of the present invention provides a multifunctional double roll blind having a roll screen including: a housing ( 310 ) fixed to a ceiling including a window or a wall surface; a winding rod ( 330 ) rotatably provided by an ascending/descending means ( 320 ) in the housing ( 310 ); a roll screen ( 340 ), of which one end is fixed to the winding rod ( 330 ) and the other end is fixed to the housing ( 310 ) for winding or unwinding by rotating the winding rod ( 330 ); a twist preventing member ( 350 ) is for un-twisting the roll screen ( 340 ) by tensioning the roll screen ( 340 ) when the winding rod ( 330 ) is rotating for winding or unwinding manipulation by the ascending or descending means ( 320 ); the roll screen ( 340 ) is configured to a first adjustment unit ( 341 ) formed at a starting part, a third adjustment unit ( 343 ) formed at an ending part, a second adjustment unit ( 342 ) formed between the first adjustment unit ( 341 ) and the third adjustment unit ( 343 ); the first adjustment unit ( 341 ) has alternatively formed a plurality of first translucent mesh part ( 341   a ) and a plurality of first sight and light blocking parts ( 341   b ) with a predetermined range and width; the third adjustment unit ( 341 ) has alternatively formed a plurality of third translucent mesh part ( 343   a ) and a plurality of third sight and light blocking parts ( 343   b ) with a predetermined range and width; the second adjustment unit ( 342 ) has alternatively formed a plurality of second translucent mesh parts ( 342   a ) and a plurality of second sight and light blocking parts ( 342   b ) with a predetermined range and width; the first translucent mesh part ( 341   a ), the second translucent mesh part ( 342   a ) and the third translucent mesh part ( 343   a ) have the same width (a); the first sight and light blocking part ( 341   b ) and the third sight and light blocking part ( 343   b ) have the same width (b); the first sight and light blocking part ( 341   b ) has the width (b) of one to five cm larger than the width (a) of the first translucent mesh part ( 341   a ); the width (c) of the second sight and light blocking part ( 342   b ) has a width (c=a+2b) obtained the width (a) of the first translucent mesh part ( 341   a ) adding to the twice of the width (b) of the first sight and light blocking part ( 341   b ); each of the length of the first adjustment unit ( 341 ) and the length of the third adjustment unit ( 343 ) is one-sixth (⅙) or more of the entire length of the roll screen and one-third (⅓) or less of the entire length of the roll screen, the plurality of first sight and light blocking parts ( 341   b ) consist of at least four sets; one first translucent mesh part is inserted between the plurality of first sight and light blocking parts; that is, one first translucent mesh part and one first sight and light blocking part are alternatively arranged at the starting part, which is one ending part of the entire screen; the plurality of third sight and light blocking parts ( 343   b ) has same number of the first sight and light blocking parts; one third translucent mesh part is inserted between the plurality of third sight and light blocking parts; that is, one third translucent mesh part and one third sight and light blocking part are alternatively arranged at the end part, which is the other ending part of the entire screen; the plurality of second sight and light blocking parts ( 341   b ) is consisted of at least even number of four set; one second translucent mesh part is inserted between the plurality of second sight and light blocking parts; that is, one second translucent mesh part and one second sight and light blocking part are alternatively arranged at the center of the entire screen; and one translucent mesh part is inserted between the first sight and light blocking part ( 341   b ) and the second sight and light blocking part ( 342   b ) located at the boundary of the first adjustment unit and the second adjustment unit; and one translucent mesh part is also inserted between the third sight and light blocking part ( 343   b ) and the second sight and light blocking part ( 342   b ) located at the boundary of the third adjustment unit and the second adjustment unit. (a) when the roll screen is fully deployed or almost deployed, the roll screen will be symmetry in both front and rear portions; when the front translucent mesh part is matched to the rear translucent mesh part in both upper and lower portions, the roll screen will be an open mode in both upper and lower portions; (b) in the previous state (a), the rear translucent mesh part matches to the front sight and light blocking part, while the front translucent mesh part is matching to the rear sight and light blocking part, the roll screen will be a blocking mode in both upper and lower portions depending on the winding or unwinding of the ascending/descending driving rope; (c) in the previous state (b), the front and rear translucent mesh parts are matched each other in the upper portion, while the front translucent mesh part is matched to the rear sight and light blocking part in the lower portion; then, the roll screen will be the open mode in the upper portion and the blocking mode in the lower portion depending on the winding or unwinding of the ascending/descending driving rope; and the roll screen is possibly set to an intermediate mode between the state (a) and state (b), and the intermediate mode between the state (b) and the state (c). 
         [0032]    Preferably, a width (c) of the second light-blocking portion  342   b  have a width (c=a+2b) obtained by adding a width a of the first mesh portion  341   a  to the twice of a width (b) of the first light-blocking portion  341   b.    
         [0033]    Further, preferably, the width b of the first light-blocking portion  341   b  may be 2 to 5 cm larger than the width a of the first mesh portion  341   a.    
         [0034]    More preferably, the width b of the first light-blocking portion  341   b  may be 2.5 to 4 cm larger than the width a of the first mesh portion  341   a.    
         [0035]    Further, preferably, lengths of the first adjustment unit  341  and the third adjustment unit  343  may be ⅙ or more and ⅓ or less of the entire length of the roll screen, respectively. 
         [0036]    Another exemplary embodiment of the present invention provides a roll screen used in a multifunctional double roll blind including: a first adjustment unit  341  formed at a start portion, a third adjustment unit  343  formed at an end portion, and a second adjustment unit  342  formed between the first adjustment unit  341  and the third adjustment unit  343 , in which the first adjustment unit  341  has first translucent mesh part  341   a  and first sight and light blocking part  341   b  alternatively formed with a predetermined range and width; the third adjustment unit  341  has third translucent mesh part  343   a , and third sight and light blocking part  343   b  alternately formed with a predetermined range and width; the second adjustment unit  342  has second translucent mesh part  342   a  and second sight and light blocking part  342   b  alternatively formed with a predetermined range and width; the first mesh portion  341   a , the second mesh portion  342   a , and the third mesh portion  343   a  have same width; the width of the first light-blocking portion  341   b  and the third light-blocking portion  343   b  are same; width c of the second light-blocking portion  342   b  has a width (c=a+2b) obtained by adding a width (a) of the first mesh portion  341   a  to the twice of width (b) of the first light-blocking portion  341   b , and length of the first adjustment unit  341  and the third adjustment unit  343  are ⅙ or more and ⅓ or less of the entire length of the roll screen, respectively. 
         [0037]    Preferably, the roll screen is integrally woven and the translucent mesh part is made of air permeable material. 
         [0038]    As described above, according to the multifunctional double roll blind having the roll screen and the roll screen used therefor of the present invention, the screen is divided into the upper and lower portions, so that the entire screen can blocked the light by the user&#39;s manipulation or the upper portion is independently opened/adjusted while the lower portion is blocked the light, and it is also possible to open the upper and lower portions partially, at same time to satisfy the user&#39;s demands. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0039]      FIG. 1  is a perspective view illustrating a use state of a multifunctional double roll blind having a roll screen according to the first related art. 
           [0040]      FIG. 2  is a perspective view illustrating a use state of a multifunctional double roll blind having a roll screen according to the second related art. 
           [0041]      FIG. 3  is a partially cross-sectional view illustrating drivers of the multifunctional double roll blind having a roll screen according to the second related art and the present invention. 
           [0042]      FIG. 4  is a perspective view illustrating a use state of a multifunctional double roll blind having a roll screen according to the present invention. 
           [0043]      FIG. 5  is a perspective view illustrating another use state of the multifunctional double roll blind having a roll screen according to the present invention. 
           [0044]      FIG. 6  is a perspective view illustrating yet another use state of the multifunctional double roll blind having a roll screen according to the present invention. 
           [0045]      FIG. 7  is a perspective view illustrating a use state of a multifunctional double roll blind having a roll screen according to another exemplary embodiment of the present invention. 
           [0046]      FIG. 8  is a perspective view illustrating another use state of the multifunctional double roll blind having a roll screen according to another exemplary embodiment of the present invention. 
           [0047]      FIG. 9  is a perspective view illustrating yet another use state of the multifunctional double roll blind having a roll screen according to another exemplary embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0048]    Hereinafter, an exemplary embodiment of a multifunction double roll blind having a roll screen and a roll screen used therefor according to the present invention will be described with reference to  FIGS. 3 to 6  in detail. 
         [0049]    First, it should be noted that the same elements or components in the drawings will be designated by the same reference numerals. In describing the present invention, a detailed description of publicly known functions or configurations incorporated herein will be omitted so as not to make the subject matter of the present invention unclear. 
         [0050]    In the accompanying drawings,  FIGS. 3 to 6  are perspective views illustrating use states of a multifunction double roll blind having a roll screen according to the present invention,  FIG. 4  is a perspective view illustrating a use state in which the entire screen is partially opened,  FIG. 5  is a perspective view illustrating a use state in which the entire screen is closed, and  FIG. 6  is a perspective view illustrating a use state in which an upper portion is partially opened and a lower portion is closed. 
         [0051]    In order to simplify the description and clarify the difference from the second related art, in  FIGS. 3 to 6  of the accompanying drawings, parts having similar functions to those of the double roll screen according to the second related art are designated like reference numerals and the detailed description thereof will be omitted or briefly described. 
         [0052]    As illustrated in  FIGS. 3 to 6 , a multifunctional double roll blind  300  having a roll screen according to the present invention includes a housing  310  which is fixed to a ceiling with a window or a wall surface through a fixing bracket (not illustrated) and provided so that a lower surface is opened, a winding rod  330  of which one end is rotatably connected to both sides of the housing  310  and the other end is rotatably installed via an ascending/descending means  320  to be rotatably provided so as to operating the ascending/descending means  320  in winding and unwinding directions, and a roll screen  340  of which one end is fixed and wound on the winding rod  330 , the other end is fixed to the housing  310  to be wound and unwound by rotating the winding rod  330 , thereby blocking the outside partially or entirely so as to cover the whole or only the lower portion of light or prevent the whole or only the lower portion of the inside of the interior from being viewed from the outside and enabling ventilation. 
         [0053]    Herein, like that of the second related art, at the lower end of the double roll screen  340 , a twist preventing member  350  is provided, in which when the roll screen  340  is unwound from and wound on the winding rod  330  by rotating the winding rod  330  by manipulation of the ascending/descending means  320 , the roll screen  340  is wound and unwound without twist by maintaining tension downward by self weight. 
         [0054]    In more detail, the housing  310  is configured by a horizontal plate  310   a  which is fixed to the ceiling or wall surface of the window through a fixing bracket, a cover plate  310   b  which is extending downward from the front end of the horizontal plate  310   a  to cover the roll screen  340  wound on the winding rod  330 , a fixing piece  310   c  which is bent and extended upward and downward from the rear end of the horizontal plate  310   a  to fix the other end of the roll screen  340  fixed and wound on one end to the winding rod  330 , and left and right fixing pins  310   d  and  310   e  of which one end is fixed to both ends of the horizontal plate  310   a  through a screw and a lower end is integrally formed with a bent piece (not illustrated) bent inward so that the ascending/descending means  320  is installable to rotate the winding rod  330  by user&#39;s manipulation by connecting one end of the winding rod  330  and the other end of the winding rod  330 . 
         [0055]    The ascending/descending means  320  is a conventional general well-known technique which is installed on the inner surface of the right fixing member  310   e  to rotate the winding rod  330  according to the user&#39;s manipulation. Like the second related art, the ascending/descending means  320  is configured by an ascending fixing piece  320   a  which is fixably provided by penetrating the bent piece of the right fixing piece  310   e  to the center so as to be installed in the inside of the right surface of the housing  310 , an ascending rotation piece  320   b  of which one end is rotatably provided at the ascending fixing piece  320   a  and locking holes (not illustrated) are formed in a circumferential direction at regular intervals on the outer circumferential surface, and an ascending/descending driving rope  320   c  which winds the outer circumferential surface of the ascending rotation piece  320   b  to rotate the ascending rotation piece  320   b  in response to user pulling in one direction and the other direction. 
         [0056]    The winding rod  330  is formed to have a circular section, and one end is rotatably connected to a bent piece (not illustrated) of the left fixing piece  310   d  of the housing  310  through a hinge piece (not illustrated) and the other end is fixed and connected to the ascending rotation piece  320   b  of the ascending/descending means  320 , and a cutting groove  330   a  for inserting and fixing one end of the roll screen  340  is cut in a longitudinal direction on the outer circumferential surface. 
         [0057]    The roll screen  340  is woven to one by continuously forming a first adjustment unit  341 , a second adjustment unit  342 , and a third adjustment unit  343 , and the first adjustment unit  341  has first translucent mesh part  341   a , through which objects on the opposite side are visible, and first sight and light blocking part  341   b , through which objects on the opposite side are not visible, which are woven repeatedly to alternate with each other over a predetermined range at a predetermined width and formed at the staring portion in the entire length, and one end thereof is fixed to the fixing piece  310   c.    
         [0058]    The third adjustment unit  341  also has third translucent mesh part  343   a , through which objects on the opposite side are visible, and third sight and light blocking part  343   b , through which objects on the opposite side are not visible, which are woven repeatedly to alternately with each other over a predetermined range at a predetermined width, but formed at the end portion in the entire length, and one end thereof is fixed to the cutting groove  330   a . The first translucent mesh part  341   a  and the first sight and light blocking part  341   b  correspond to the third translucent mesh part  343   a  and the first sight and light blocking part  343   b.    
         [0059]    Meanwhile, the second adjustment unit  342  also has second translucent mesh part  342   a , through which objects on the opposite side are visible, and second sight and light blocking part  342   b , through which objects on the opposite side are not visible, which are woven repeatedly to alternate with each other over a predetermined range at a predetermined width, but formed in the middle portion between the staring portion and the end portion in the entire length and one end is continued in the first adjustment unit  341  and the other end is continued in the third adjustment unit  343 . 
         [0060]    The second translucent mesh part  342   a  correspond to the first translucent mesh part  341   a , but the second light-blocking portion  342   b  is formed to have a width larger than that of the first light-blocking portion  341   b.    
         [0061]    Preferably, widths a of the first to third translucent mesh part  341   a ,  342   a , and  343   a  are the same as each other, widths b of the first to third sight and light blocking part  341   b  and  343   b  are slightly larger (preferably 2 to 5 cm larger, more preferably 2.5 to 4 cm larger, and most preferably 3.0 cm larger) than the widths a of the translucent mesh part (that is, b=a+3.0). In addition, when the first sight and light blocking part  341   b  and the third translucent mesh part  343   a  are in contact with each other in the front and rear directions when the first sight and light blocking part  341   b  and the third sight and light blocking part  343   b  block the light together, the first sight and light blocking part  341   b  and the third sight and light blocking part  343   b  overlap each other by about 1.5 cm at the upper and lower sides to fully block the light. 
         [0062]    However, it is preferred that the second light-blocking portion  242   b  has a width by a length obtained by adding the width of the first mesh portion  341   a  to twice the width of the first light-shielding portion  341   b  (i.e., c=a+2b), and the second light-blocking portion further needs the purpose of blocking the lower portion of the window. 
         [0063]    This will be described in detail again with reference to  FIGS. 5 and 6 . 
         [0064]    In any case, the error needs not to exceed ±5% in the above relationship of the width a of the mesh portion, the width b of the first light-blocking portion, and the width c of the second light-blocking portion. 
         [0065]    For example, the width a of the mesh portion may be 5 cm, the width b of the first light-blocking portion may be 8.0 cm, and the width c of the second light-blocking portion may be 21 cm. 
         [0066]    As a result, the roll screen  340  formed at the start portion and the end portion is wound on the winding rod  330  to entirely block the light or block only the lower portion by partially or entirely blocking the outside in response to operating the ascending/descending means  320  in unwinding and winding directions as illustrated in  FIGS. 4 to 6 , thereby preventing the inside of the interior from being seen from the outside from the whole or middle portion to the lower portion. As a result, the lengths of the first adjustment unit  341  and the third adjustment unit  343  formed at the start portion and the end portion of the entire length are about ¼ the same as each other, and the second adjustment unit  342  is formed in a section of about 2/4 obtained by subtracting the length of the first adjusting portion  341  formed at the upper portion and the lower portion from the entire length. 
         [0067]    However, the lengths of the first adjustment unit  341  and the third adjustment unit  343  are not necessarily limited to about ¼, and the lengths of the first adjustment unit  341  and the third adjustment unit  343  is formed to be slightly larger or slightly smaller than ¼. If the lengths of the first adjustment unit  341  and the third adjustment unit  343  are smaller than ⅙, a ratio of the upper portion to the entire blind height is less than ⅓ when the blind is fully deployed, which is not preferable, and if the lengths of the first adjustment unit  341  and the third adjustment unit  343  are larger than ⅓, the ratio of the upper portion to the entire blind height exceeds ⅔ when the blind is fully deployed, which is not preferable. That is, the lengths of the first adjustment unit  341  and the third adjustment unit  343  are preferably ⅙ or more and ⅓ or less, and more preferably about ¼. 
         [0068]    That is, most preferably, the roll screen  340  has the first adjustment unit  341  and the third adjustment unit  343  formed in an interval of about ¼ of the start and end portions with respect to the entire length, and the second adjustment unit  342  formed to have a length of about 2/4 of the entire length in the middle portion. 
         [0069]    More particularly, the roll screen  340  is configured by the first adjustment unit  341  formed at the start portion and the third adjustment unit  343  formed at the end portion with respect to the entire length direction and the second adjustment unit  342  formed between the first adjustment unit  341  and the third adjustment unit  343 . The first adjustment unit  341  and the third adjustment unit  343  of the roll screen  340  formed at the start portion and the end portion are wound on the winding rod  330  to entirely block the light or block only the lower portion by partially or entirely blocking the outside in response to operating the ascending/descending means  320  in unwinding and winding directions or preventing the inside of the interior from being seen from the outside from the whole or middle portion to the lower portion. Accordingly, the lengths of the first adjustment unit  341  and the third adjustment unit  343  formed at the start portion and the end portion of the entire length are about ¼ the same as each other, and the second adjustment unit  342  is formed in a section of about 2/4 obtained by subtracting the length of the first adjusting portion  341  formed at the upper portion and the lower portion from the entire length. 
         [0070]    Meanwhile, the second adjustment unit  342  is integrally formed by weaving the first and third adjustment units by weaving as described above, but is not limited thereto, and the second adjustment unit  342  is woven to correspond to the width of the woven roll screen so that the both ends thereof are fixed to the screen in which the translucent mesh part and the sight and light blocking part are alternately woven through a fixing means or fusion or sewing. 
         [0071]    When describing the operation of the multifunctional double roll blind having the roll screen according to the present invention, after the multifunctional double roll blind having the roll screen according to the present invention is fixed to the ceiling of the window, when the roll screen  340  of the roll blind  300  intends to be adjusted to block the light or prevent the inside of the interior from being seen from the outside and enable ventilation, as illustrated in  FIG. 4  of the accompanying drawings, first, the user grips the ascending/descending driving rope  320   c  and pulls the driving rope  320   c  downward. 
         [0072]    When the ascending/descending driving rope  320   c  is pulled downward, the ascending rotation piece  320   b  of the ascending/descending means  320  is rotated, and as a result, the winding rod  330  having one end and the other end rotatably mounted on the housing  310  and the ascending/descending rotation piece  320   b  is rotated in one direction, that is, in a direction in which the roll screen  340  wound on the winding rod  330  is unwound. 
         [0073]    The roll screen  340  is tensioned downward by the self-weight of the twist preventing member  350  in response to the rotation of the winding rod  340  and unwound without twist. 
         [0074]    (1) As such, by using the roll screen  340  wound on the winding rod  330  while the roll screen  340  is unwound from the winding rod  330  as described above, the upper portion of the window transmits light and outer air and can see the outside in the interior and the lower portion is blocked not to see the outside, the user gripes the ascending/descending driving rope  320   c  and pulls the driving rope  320   c  downward so that the first translucent mesh part  341   a  and the second translucent mesh part  342   a  of the wound roll screen  340  are matched with each other and the second translucent mesh part  342   a  are matched with the second sight and light blocking part  342   b  (see  FIG. 6 ). In this case, the first sight and light blocking part  341   b  and the third sight and light blocking part  343   b  are also matched with each other, but since the second sight and light blocking part  342   b  are formed to have a long width, the second sight and light blocking part on the front surface are matched with some of the second translucent mesh part  342   a  and the second sight and light blocking part  342   b  on the rear surface. 
         [0075]    Accordingly, as illustrated in  FIG. 6 , the roll screen is deployed, and like the above example, when the width a of the mesh portion is 5 cm, the width b of the first light-blocking portion is 8.0 cm, and the width c of the second light-blocking portion is 21 cm, the roll screen becomes an upper-opened and lower-blocked mode in which the upper portion is matched with the first and third translucent mesh part and opened and the lower portion is blocked. In some cases, the winding rod may be slightly rotated to partially match the first and third translucent mesh part with each other to be in an upper partial open mode. 
         [0076]    (2) Meanwhile, when the winding rod  330  is further or less rotated as illustrated in  FIG. 5 , that is, when the upper first translucent mesh part  341   a  and the second translucent mesh part  342   b  are matched with each other and the first sight and light blocking part  341   b  and the second translucent mesh part  342   a  are matched with each other, the second translucent mesh part  342   a  are still blocked by the second sight and light blocking part  342   b  with large widths, and thus, the roll screen may be in an upper and lower blocking mode in which the upper portion of the window is blocked and the lower portion is blocked. 
         [0077]    (3) On the other hand, in the upper and lower blocking mode, when the winding rod  330  is further or less rotated as illustrated in  FIG. 4 , that is, when the upper first translucent mesh part  341   a  and the third translucent mesh part  343   a  are matched with each other and the second translucent mesh part  342   a  are also matched with other second translucent mesh part  342   a , and thus, the roll screen may be in an upper and lower open mode in which the upper portion of the window is opened and the lower portion is opened. 
         [0078]    However, in this case, the upper portion has a structure in which 21 cm blocking is repeated, but the lower portion has a structure in which 5 cm opening and 21 cm blocking are repeated. Also, in some cases, the winding rod is slightly further rotated to partially match the first and third translucent mesh part with each other and partially match the second translucent mesh part with each other to be in an upper and lower partial open mode. 
         [0079]    As such, while the roll screen is almost deployed, i) according the double roll blind in the first related art, two modes in which the whole portion is opened or the whole portion is closed are enabled (that is, the whole portion can be integrally adjusted), ii) even in the double roll blind according to the second related art in  FIG. 2 , only two modes in which the upper portion is opened and the lower portion is closed or the whole portion is closed are enabled (that is, while the lower portion is closed, only the upper portion can be adjusted), but iii) according to the double roll blind according to the present invention, three modes in which the upper portion is opened and the lower portion is closed, the whole portion is closed, and the whole portion is opened are enabled (that is, the whole portion can be integrally adjusted, and while the lower portion is closed, only the upper portion can be adjusted). 
         [0080]    Of course, considering the fact that in the second related art of  FIG. 2 , the privacy protection is almost performed in the lower portion, while only the lower portion is closed, only the upper portion may be adjusted so that it is closer to the user&#39;s need. Even in the second related art of  FIG. 2 , when the whole portion is opened, it is achieved by fully winding the roll blind, but in this case, there is a disadvantage in that the upper and lower portions need to be fully opened, and furthermore, there is an inconvenience that the blind needs to be driven for a long time to be fully deployed and fully wound. However, according to the present invention, if only about 6.5 cm in the maximum deployed state (in an upper-adjustment lower-closed mode) of  FIG. 6  is wound, the state of  FIG. 5  (a full closed mode) is enabled and when only about 6.5 cm is further wound, the state of  FIG. 4  (a full control mode) is enabled. 
         [0081]    Of course, there may be a case where the upper portion is closed and only the lower portion is opened, and in this case, the screen may be achieved only by winding and unwinding only the middle portion. Even in this case, in the second related art of  FIG. 2 , only the upper portion is closed, but according to the present invention, there is an additional advantage in that the upper portion may be adjusted to a partially opened state. Of course, even in the double roll blind of the first related art, while the lower portion is fully opened, the upper portion may be adjusted, but in the double roll blind of the first related art, only the lower portion is not closed at all. As a result, the present invention can achieve both advantages of the blind of the first related art and the blind of the second related art of  FIG. 2 . 
         [0082]    For reference, if the full closed mode of  FIG. 5  is achieved, it is necessary to wind about 6.5 cm in the fully deployed state and lift the lower end of the twist preventing member  350  having a weight by about 3.25 cm. However, since the width of the window frame is usually about 7 to 8 cm, even if the lower end of the screen ascends about 3.25 cm from the rim of the window, there is no problem in fully closing the window. 
         [0083]    As described above, the multifunctional dual roll blind having the roll screen of the present invention can use various desired roll screens by a simple manipulation of the user with only one double roll blind, thereby satisfying the user&#39;s demands. 
         [0084]    Meanwhile, in the first exemplary embodiment of  FIGS. 4 to 6 , while the roll screen is maximally deployed as illustrated in  FIG. 6 , the lower-closed upper-opened state is implemented,  6 , and when about 6.5 cm is wound in the full closed mode of  FIG. 5  is implemented, and when about 6.5 cm is further wound, the full adjustment mode of  FIG. 4  is implemented, but another second exemplary embodiment for implementing winding and unwinding of the roll screen in an opposite direction is also possible. 
         [0085]      FIG. 7  is a perspective view illustrating a use state of a multifunctional double roll blind having a roll screen according to another exemplary embodiment of the present invention,  FIG. 8  is a perspective view illustrating another use state of the multifunctional double roll blind having a roll screen according to another exemplary embodiment of the present invention, and  FIG. 9  is a perspective view illustrating yet another use state of the multifunctional double roll blind having a roll screen according to another exemplary embodiment of the present invention. 
         [0086]    In the exemplary embodiment, the full adjustment mode is implemented in a state in which the roll screen is maximally deployed as illustrated in  FIG. 7 , and when about 6.5 cm is wound in the maximum deployed state (a full adjustment mode) in  FIG. 7 , the full adjustment mode of  FIG. 8  is implemented, and when about 6.5 cm is further wound, the lower-closed and upper-opened mode of  FIG. 9  is implemented, and thus, the roll screen needs to be wound and unwound in the opposite direction to that of the first exemplary embodiment. 
         [0087]    In the case of the first exemplary embodiment, it is preferable to complete sealing in that the lower portion is closed when fully deployed, whereas in the second exemplary embodiment, the screen has a symmetrical structure, and thus there is an advantage of it is preferable when cutting a long woven fabric to a required length. Hereinabove, it is described that the roll screen is woven to have the translucent mesh part and the sight and light blocking part, but the translucent mesh part are not necessarily made of a woven material having air permeability and other transparent materials do not depart from the scope of the technical spirit of the present invention. However, in the case of the material having air permeability, it is more preferable because it is possible to exhibit not only lighting and a vision but also ventilation purpose of inner and outer parts. In addition, when the translucent mesh part and the sight and light blocking part are woven integrally, it is preferred that winding and unwinding are more natural and a thin screen is enabled, but it is not necessarily limited thereto. 
         [0088]    The aforementioned present invention is not limited to the aforementioned exemplary embodiments and the accompanying drawings, and it will be obvious to those skilled in the technical field to which the present invention pertains that various substitutions, modifications, and changes may be made within the scope without departing from the technical spirit of the present invention.