CN108729833B - Folding curtain - Google Patents

Abstract

The pleated curtain with light leakage suppression and high design is provided; the pleated curtain of the invention is provided with an upper curtain cloth (6U) and a lower curtain cloth (6L) which can be respectively lifted through a plurality of lifting ropes (3U, 3L), and is composed of: a first lifting rope (3U (or 3L)) in the lifting ropes (3U and 3L) is inserted into the through hole (4U) of the upper curtain cloth (6U), and a second lifting rope (3L (or 3U)) in the lifting ropes (3U and 3L) is not inserted into the through hole (4U) of the upper curtain cloth (6U).

Description

Folding curtain

Technical Field

The present invention relates to a blind curtain in which a curtain fabric that can be bent in the vertical direction is suspended and supported from an upper frame and lifted to adjust the amount of lighting.

Background

The blind is suspended and supported from the upper beam and can be bent in the vertical direction, and the blind is lifted and lowered by an operating device so as to be capable of adaptively adjusting the lighting amount.

Generally, for a blind in which a piece of cord is suspended and supported from a head rail, the cord is a curtain fabric (a shade fabric) or a lace fabric (a daylighting fabric), and the amount of daylighting is adjusted by folding the cord.

In addition, as one of the pleated blinds, the curtain fabric which can be bent in the vertical direction in a zigzag manner is composed of an upper curtain fabric and a lower curtain fabric which are made of different fabrics, the lower end edge of the upper curtain fabric and the upper end edge of the lower curtain fabric are mounted on a middle rail, and the middle rail and the bottom rail are suspended and supported through independent lifting ropes.

In the pleated blind having the upper cord and the lower cord, the upper cord is a daylighting fabric and the lower cord is a shade fabric, or conversely, various combinations of fabrics such as the upper cord is a shade fabric and the lower cord is a daylighting fabric may be separated by the intermediate rail. Then, the lighting amount can be adjusted by folding either one or both of the upper curtain cloth and the lower curtain cloth, thereby increasing the degree of freedom in adjusting the lighting amount. The number of intermediate rails is not limited to one, and a combination of three or more intermediate rails may be used.

There is disclosed a pleated curtain in which one through hole is provided in an upper curtain cloth for an upper lift cord and a lower lift cord that can lift and lower the upper curtain cloth and the lower curtain cloth, respectively, and two cords of the upper lift cord and the lower lift cord are inserted into the one through hole (see, for example, patent document 1).

Further, there is disclosed a pleated curtain in which two through holes are provided in parallel in the left-right direction in an upper curtain cloth for an upper lifting cord and a lower lifting cord that can lift the upper curtain cloth and the lower curtain cloth, respectively, and the upper lifting cord and the lower lifting cord are inserted into the two through holes, respectively (for example, see patent document 2).

Documents of the prior art

[ patent document ]

[ patent document 1 ] Japanese patent laid-open No. 2002-332785

[ patent document 2 ] Japanese patent laid-open No. 2002-115474

As described above, in the configuration of patent document 1, when the pleated cover having the upper curtain cloth and the lower curtain cloth is configured, one through hole is provided in the upper curtain cloth, and two ropes of the upper lifting rope and the lower lifting rope are inserted into the one through hole.

In the configuration of patent document 2, when a pleated cover having an upper curtain cloth and a lower curtain cloth is configured, two through holes are provided in parallel in the left-right direction in the upper curtain cloth, and an upper lifting cord and a lower lifting cord are inserted into the two through holes, respectively.

However, in these proposals, the size or number of the through holes in the upper cord is increased, and there is a problem that light leakage due to these through holes is increased.

Therefore, in a pleated curtain having an upper curtain and a lower curtain, a proposal for suppressing light leakage caused by a through hole provided in the curtain is desired. Further, since the arrangement of the lift cords also hinders design, a solution for constructing a pleated curtain with high design is desired.

Disclosure of Invention

In view of the above problems, the present invention provides a pleated curtain that suppresses light leakage and has particularly high design properties.

According to a first aspect of the present invention, there is provided a blind including an upper curtain and a lower curtain which are respectively movable up and down by a plurality of lift cords, wherein a first lift cord for moving one of the upper curtain and the lower curtain up and down is inserted into a through hole of the upper curtain, and a second lift cord for moving the other of the upper curtain and the lower curtain up and down is not inserted into the through hole of the upper curtain.

Further, the blind of the first aspect of the present invention is characterized in that: the second lifting rope is inserted into the through hole of the lower curtain cloth.

Further, the blind of the first aspect of the present invention is characterized in that: the specified value of the diameter of the through hole is set to 1.8mm, and the specified values of the diameters of the first lifting rope and the second lifting rope are set to 0.7 mm.

Further, the blind of the first aspect of the present invention is characterized in that: the through hole of the upper curtain cloth is formed at a position deviated from the approximate center of the upper curtain cloth in the front-back direction.

Further, the blind of the first aspect of the present invention is characterized in that: the through-hole of the upper curtain cloth is formed at a position offset in the front-rear direction with respect to the through-hole of the lower curtain cloth.

Further, the blind of the first aspect of the present invention is characterized in that: the second lift cord is inserted into a ring-shaped support cord provided on the space holding cord.

Further, a blind according to a second aspect of the present invention is a blind including an upper fabric and a lower fabric which are respectively movable up and down by a plurality of lift cords, wherein a first lift cord for moving up and down the upper fabric is inserted into a through hole of the upper fabric, and a second lift cord for moving up and down the lower fabric is inserted into a through hole formed at a position shifted rearward from a center of a width in a front-rear direction of the lower fabric, without being inserted into the through hole of the upper fabric.

Further, a blind according to a third aspect of the present invention is a blind including an upper cord and a lower cord that are respectively movable up and down by a plurality of lift cords, wherein a first lift cord for lifting and lowering the upper cord is inserted into a through hole of the upper cord, the lower cord is offset rearward from the upper cord, and a second lift cord for lifting and lowering the lower cord is inserted into a through hole of the lower cord without being inserted into the through hole of the upper cord.

Further, a blind according to a fourth aspect of the present invention is a blind including an upper cord and a lower cord that are respectively movable up and down by a plurality of lift cords, wherein a first lift cord for lifting and lowering the upper cord is inserted into a through hole of the upper cord, the lower cord is formed to have a width in a front-rear direction larger than that of the upper cord, and a second lift cord for lifting and lowering the lower cord is inserted into the through hole of the lower cord without being inserted into the through hole of the upper cord.

Further, a pleated curtain according to a fifth aspect of the present invention is a pleated curtain including an upper fabric and a lower fabric that are respectively movable up and down by a plurality of lift cords, wherein a first lift cord for moving up and down the upper fabric is inserted into a through hole of the upper fabric, and a second lift cord for moving up and down the lower fabric is inserted into a through hole formed in an engaging piece provided at a rear end portion of each of the layers of the lower fabric that are folded in a zigzag manner in a vertical direction.

Further, a pleated curtain according to a sixth aspect of the present invention is a pleated curtain including an upper curtain and a lower curtain that are respectively movable up and down by a plurality of lift cords, wherein a first lift cord for moving up and down the upper curtain is inserted into a through hole of the upper curtain, and a second lift cord for moving up and down the lower curtain is inserted into a through hole formed in each layer of the lower curtain that is folded in a zigzag manner in a vertical direction, without being inserted into the through hole of the upper curtain, and the through hole of each layer of the lower curtain includes a through hole formed at a position that is offset from a front rear side toward a lower side from an uppermost layer.

Further, a pleated curtain according to a seventh aspect of the present invention is a pleated curtain including an upper fabric and a lower fabric that are respectively movable up and down by a plurality of lift cords, wherein a first lift cord for moving up and down the upper fabric is inserted into a through hole of the upper fabric, and a second lift cord for moving up and down the lower fabric is inserted into a through hole provided below a predetermined layer of the lower fabric, which is a predetermined layer including an uppermost layer of the plurality of layers of the lower fabric, while hanging down behind the predetermined layer, without being inserted into the through hole of the upper fabric.

(effect of the invention)

According to the present invention, a pleated curtain that suppresses light leakage and has high design properties in particular can be configured.

Drawings

Fig. 1 shows a front view of a schematic structure of a pleated curtain according to a first embodiment of the present invention.

Fig. 2 (a) and (b) are respectively a front view and a side view partially showing a schematic structure of the pleated curtain according to the first embodiment of the present invention.

Fig. 3 (a) and (b) are a schematic enlarged side view of the periphery of the curtain of an example of the pleated curtain according to the first embodiment of the present invention, and a schematic enlarged side view of the periphery of the curtain of a further modified example, respectively.

Fig. 4 (a) and (b) are a front view and a side view, respectively, partially showing a schematic structure of a blind according to a comparative example of the related art, which can be compared with the first embodiment of the present invention.

Fig. 5 (a) and (b) are enlarged side views of the periphery of the upper curtain of an example of the pleated cover according to the first embodiment of the present invention (a state where the support cords of the pitch-retaining cords are in contact with the fabric of the upper curtain), and the periphery of the upper curtain of the pleated cover according to a comparative example of the related art (a state where the support cords of the pitch-retaining cords are in contact with the fabric of the upper curtain).

Fig. 6 (a) and (b) are enlarged side views of the periphery of the upper cord (in a state where the support cords of the pitch holding cords and the fabric of the upper cord are not in contact) of an example of the pleated cover according to the first embodiment of the present invention, and enlarged side views of the periphery of the upper cord (in a state where the support cords of the pitch holding cords and the fabric of the upper cord are not in contact) in the pleated cover according to a comparative example based on the related art.

Fig. 7 (a), (b), and (c) are enlarged side views of the periphery of the upper fabric (the support cords of the pitch holding cords and the fabric of the upper fabric are in a non-contact state) of the blind according to the modified example of the first embodiment of the present invention.

Fig. 8 (a) and (b) are respectively an enlarged side view of the periphery of the cord fabric of an example of the pleated blind according to the second embodiment of the present invention and an enlarged side view of the periphery of the cord fabric of a modified example thereof.

Fig. 9 (a) and (b) are respectively an enlarged side view of the periphery of the cord fabric of an example of the pleated blind according to the third embodiment of the present invention and an enlarged side view of the periphery of the cord fabric of a modified example thereof.

Fig. 10 (a) and (b) are respectively an enlarged side view of the periphery of the cord fabric of an example of the pleated blind according to the fourth embodiment of the present invention and an enlarged side view of the periphery of the cord fabric of a modified example thereof.

Fig. 11 (a) and (b) are a schematic enlarged side view of the periphery of the curtain of an example of the pleated curtain according to the fourth embodiment of the present invention, and a schematic enlarged side view of the periphery of the curtain of a further modified example, respectively.

Fig. 12 (a) and (b) are schematic enlarged side views of the periphery of the blind of examples 1 and 2, respectively, according to still another embodiment of the present invention.

Fig. 13 (a) and (b) are schematic enlarged side views of the periphery of the blind of examples 3 and 4, respectively, according to further another embodiment of the present invention.

Fig. 14 (a) and (b) are schematic enlarged side views of the periphery of the blind of examples 5 and 6, respectively, according to still another embodiment of the present invention.

(symbol description)

1 Upper Beam

2 bracket

3U upside lifting rope

3L lower side lifting rope

4U, 4L through hole

5 middle rail

6 cord fabric

6U upper curtain cloth

6L lower curtain cloth

7 bottom rail

Detailed Description

Hereinafter, a pleated curtain according to embodiments of the present invention will be described with reference to the accompanying drawings. In the present specification, with respect to the front view of the pleated cover shown in fig. 1, the suspension directions of the curtain above and below the drawing based on the curtain are defined as the upper direction (or upper side) and the lower direction (or lower side), the left direction of the drawing is defined as the left side of the pleated cover, and the right direction of the drawing is defined as the right side of the pleated cover, respectively. In addition, the front view side in fig. 1 is visually recognized as the front side (indoor side), and the opposite side is the rear side (outdoor side).

[ first embodiment ]

First, a pleated curtain of the first embodiment having an upper fabric 6U and a lower fabric 6L will be described with reference to fig. 1 and 2. Fig. 1 is a front view showing a schematic structure of a pleated curtain according to a first embodiment of the present invention. Fig. 2 (a) and (b) are a front view and a side view, respectively, partially showing a schematic structure of a pleated curtain according to a first embodiment of the present invention.

The upper curtain cloth 6U of the blind of the first embodiment is suspended from the upper frame 1 and is bendable in a zigzag shape, and the lower end of the curtain cloth 6U is attached to the upper surface of the intermediate rail 5.

Similarly, the upper end of the lower cord 6L, which is bendable in a zigzag shape, is attached to the lower surface of the intermediate rail 5, and the lower end of the lower cord 6L is attached to the bottom rail 7.

The upper beam 1 has both ends respectively suspending and supporting the first and second operating ropes 9L, 9U. The first operation cord 9L performs the following operations: a plurality of (two in this example) lower lifting ropes 3L for lifting the bottom rail 7 are led out from the rope lead-out opening 1a of the upper beam 1 or led into the upper beam 1. The second operation cord 9U performs the following operations: a plurality of (two in this example) upper side elevating cords 3U for elevating the intermediate rail 5 are led out from the cord leading-out port 1b of the upper beam 1 or led into the upper beam 1.

One end of each lower lift rope 3L is connected to a first operation rope 9L via a rope balancer 8L, and the other end of each lower lift rope 3L is guided into the upper beam 1 via a brake device (not shown) provided in the upper beam 1, and is turned downward via a support member 10 (see fig. 2 b) of a support pulley 10a disposed at an appropriate position in the upper beam 1. Then, the other end of each lower lifting rope 3L turned downward is drawn out from the upper beam 1, is hung on the back surface of the upper fabric 6U while being routed through the back surface of the intermediate rail 5 without being inserted into the through hole 4U provided in the upper fabric 6U, passes through the lower fabric 6L by being inserted into the through hole 4L provided in the lower fabric 6L, and is connected to the bottom rail 7.

Therefore, when the first operating cord 9L is operated to draw the lower lift cord 3L out of the upper frame 1, the bottom rail 7 is lifted, and when the first operating cord 9L is released to brake the lock of the brake device, the lower lift cord 3L is prevented from being drawn into the upper frame 1, and the bottom rail 7 can be suspended and supported at a desired position.

Further, after the lock of the brake device is released by slightly pulling out the lower lift cord 3L from the upper beam 1 by operating the first operating cord 9L, the lower lift cord 3L is pulled into the upper beam 1 by releasing the first operating cord 9L, and the bottom rail 7 can be lowered by the weight of the bottom rail 7.

One end of each upper lift rope 3U is connected to a second operation rope 9U via a rope balancer 8U, and the other end of each upper lift rope 3U is guided into the upper beam 1 via a brake device (not shown) provided in the upper beam 1, and is then turned downward via a support member of a support pulley disposed at an appropriate position in the upper beam 1. Then, the other end of each upper lifting rope 3U turned downward penetrates the upper curtain 6U by being inserted into the through hole 4U provided in the upper curtain 6U, and is connected to the intermediate rail 5.

Therefore, when the upper lift cord 3U is drawn out from the upper beam 1 by operating the second operation cord 9U, the intermediate rail 5 is lifted, and the lock of the brake device is braked by releasing the second operation cord 9U, whereby the upper lift cord 3U is prevented from being drawn into the upper beam 1, and the intermediate rail 5 can be suspended and supported at a desired position.

Further, after the lock of the brake device is released by slightly pulling out the upper lift cord 3U from the upper beam 1 by operating the second operating cord 9U, the upper lift cord 3U is pulled into the upper beam 1 by releasing the second operating cord 9U, and the middle rail 5 can be lowered by the weight of the middle rail 5.

In the pleated cover of the first embodiment configured as described above, when the bottom rail 7 is lowered with the upper curtain 6U folded between the upper member 1 and the intermediate rail 5 by raising the intermediate rail 5 directly below the upper member 1, the lower curtain 6L is suspended and supported from the upper member 1.

When the intermediate rail 5 is lowered above the bottom rail 7 in a state where the bottom rail 7 is lowered to the lower limit, the lower curtain 6L is folded between the intermediate rail 5 and the bottom rail 7, and the upper curtain 6U is suspended and supported between the upper beam 1 and the intermediate rail 5. Therefore, for example, when the upper fabric 6U is a daylighting fabric and the lower fabric 6L is a shade fabric, the degree of freedom in adjusting the daylighting amount can be increased.

Then, when the bottom rail 7 is lowered to the lower limit and the middle rail 5 is positioned between the upper beam 1 and the bottom rail 7, a soft light can be introduced through the upper curtain cloth 6U which is a lighting fabric.

When the bottom rail 7 is lifted to the upper limit and released, the first operation cord 9L is operated to lift the bottom rail 7 without lifting the intermediate rail 5, and the upper curtain 6U and the lower curtain 6L are folded between the upper beam 1 and the bottom rail 7.

As shown in fig. 2 (b), the pitch maintaining rope 11 is hung from the upper beam 1 and attached to the intermediate rail 5 behind the upper lift rope 3U, that is, on the outdoor side, and the pitch maintaining rope 12 is hung from the intermediate rail 5 and attached to the bottom rail 7.

The upper lifting rope 3U and the lower lifting rope 3L are inserted into a plurality of annular support ropes 11a, 12a provided at equal intervals on the space holding ropes 11, 12, respectively. When the intermediate rail 5 is lowered to stretch the upper fabric 6U, the upper fabric 6U is supported by the support cords 11a, and the fold lines of the upper fabric 6U are held at substantially equal intervals. Similarly, when the bottom rail 7 is lowered to stretch the lower curtain 6L, the lower curtain 6L is supported by the support cords 12a, and the fold lines of the lower curtain 6L are held at substantially equal intervals.

However, in the pleated cover of the first embodiment shown in fig. 1, as shown in fig. 2 (b), the lower lift cord 3L is not inserted into the through hole 4U provided in the upper fabric 6U, but is hung from the back surface of the upper fabric 6U and inserted into the through hole 4L provided in the lower fabric 6L, thereby penetrating the lower fabric 6L and being connected to the bottom rail 7.

That is, as shown in fig. 2 (a) and (b), only the upper curtain 6U is provided with the through hole 4U through which the upper lifting rope 3U having an end connected to the intermediate rail 5 is inserted.

Accordingly, since the upper curtain 6U does not need to be provided with a through hole through which the lower lift cord 3L is inserted, light leakage can be suppressed, and as can be understood from the front view shown in fig. 2 (a), the upper lift cord 3U and the lower lift cord 3L are provided in a straight line, thereby improving the appearance.

In the example of the present embodiment, the lower lifting cord 3L is configured to hang down from the rear surface of the upper fabric 6U without being inserted into the through hole 4U provided in the upper fabric 6U as shown in fig. 3 (a), and configured to hang down from the front surface of the upper fabric 6U without being inserted into the through hole 4U provided in the upper fabric 6U as shown in fig. 3(b), and the upper lifting cord 3U and the lower lifting cord 3L are provided in a straight line in a front view, thereby improving the appearance.

Further, in the pleated cover of the first embodiment shown in fig. 1, as shown in fig. 2 (a), the size of the through holes 4U, 4L for inserting the upper lifting cord 3U and the lower lifting cord 3L provided in the upper curtain 6U and the lower curtain 6L, respectively, is extremely small, and only one of the upper lifting cord 3U and the lower lifting cord 3L can be accommodated, and there is no space for accommodating other cords. This structure can reduce light leakage from the through holes 4U and 4L.

Further, in the pleated cover of the first embodiment, both the cross-sectional areas of the upper lift cord 3U and the lower lift cord 3L and the areas of the through holes 4U and 4L are smaller than those in the conventional embodiments. This makes it possible to restrict the movement of the upper fabric 6U and the lower fabric 6L in the vertical direction to a preferable vertical direction, thereby reducing the width of the movement deviation (for example, the deviation in the horizontal direction) of the upper fabric 6U and the lower fabric 6L in the vertical direction, and maintaining the overall appearance of the pleated cover in a good state.

More specifically, the structure around the blind of the first embodiment will be described with reference to fig. 2, 4 to 6, and comparative examples. As shown in fig. 2, on the other hand, fig. 4 (a) and (b) show comparative examples for comparison with the first embodiment of the present invention based on the prior art. Next, fig. 5 and 6 show enlarged side views of the periphery of the upper curtain comparing the configuration of the first embodiment of the present invention with the configuration of the comparative example thereof, respectively.

First, referring to fig. 2 (a), in the pleated blind according to the first embodiment of the present invention, in a state where the foldable upper cord 6U (likewise, the lower cord 6L) is stretched, the upper cord 6U (likewise, the lower cord 6L) is inclined at substantially 45 ° from the horizontal, and when the upper cord 6U formed of a circular hole having a size of the through hole 4U and a diameter D is used as an observation surface (shown in a broken-line circle), the lifting cord 3 having a cord diameter (cross-sectional diameter) D of a circular cross-section is formed into an elliptical cross-sectional shape having a short diameter D1 (equal to the cord diameter D) and a long diameter D2 (equal to D × (v 2) when the lower cord 6L formed of a circular hole having a size of the through hole 4L is used as an observation surface (shown in a broken-line circle).

Then, the gap between the upper side lift cord 3U and the through hole 4U or the gap between the lower side lift cord 3L and the through hole 4L is a factor of light leakage, and the gap of the pleated cover according to the first embodiment of the present invention is smaller than that of the related art. This reduces light leakage due to the through holes 4U and 4L. Further, the blind according to the first embodiment of the present invention is configured such that: as shown in fig. 2 (b), the upper lifting cord 3U penetrates only the upper cord 6U and the lower lifting cord 3L penetrates only the lower cord 6L via through holes 4U, 4L provided in substantially central portions of the front-rear direction widths of the upper cord 6U and the lower cord 6L, respectively. In this example, the upper lift cord 3U and the lower lift cord 3L are configured to hang down at substantially the center of the width (shown width 2 × a) in the front-rear direction of the intermediate rail 5.

On the other hand, as shown in fig. 4 (a), in the pleated curtain according to the comparative example of the conventional art, similarly in the state where the foldable upper curtain 6U (and likewise the lower curtain 6L) is stretched, the upper curtain 6U (and likewise the lower curtain 6L) is inclined at substantially 45 ° from the horizontal, and the size of the through hole 4U for inserting the upper lifting cord 3U and the lower lifting cord 3L of the cord diameter (cross-sectional diameter) D ' is configured as a circular hole of the diameter D ″ as an enlarged view of the fabric surface, and the size of the through hole 4L for inserting the lower lifting cord 3L of the cord diameter (cross-sectional diameter) D ' is configured as a circular hole of the diameter D '. Here, when the upper fabric 6U and the lower fabric 6L, which are formed by the through holes 4U and 4L having the hole diameters D ″ and D ', are respectively set as the observation fabric surfaces (shown in a dotted circle), the lift cord 3 having a cord diameter (cross-sectional diameter) D ' of a circular cross section has an elliptical cross-sectional shape having a short diameter D1 ' (═ cord diameter D ') and a long diameter D2(≈ D ' × √ 2). Then, the gap between the lift cord 3 and the through hole 4U is a factor of light leakage, and it is understood from the comparative example of the conventional configuration that the gap is larger than the blind according to the first embodiment of the present invention shown in fig. 2. In the comparative example according to the conventional technique, both the upper lift cord 3U and the lower lift cord 3L penetrate the upper curtain 6U and the lower lift cord 3L penetrates only the lower curtain 6L as shown in fig. 4 (b) via the respective through holes 4U provided in the substantially central portion of the width of the upper curtain 6U in the longitudinal direction. In this example, the upper lift cord 3U and the lower lift cord 3L are configured to hang down at substantially the center of the width (shown width 2 × a) in the front-rear direction of the intermediate rail 5. Therefore, a through passage 5a that penetrates the lower lift cord 3L is formed substantially at the center of the width (shown width 2 × a) of the intermediate rail 5 in the front-rear direction.

However, the pleated cover using the space holding cords 11, 12 has two states of a contact state in which the support cord 11a of the space holding cord 11 is in contact with the fabric of the upper fabric 6U and a non-contact state in which it is not in contact, and similarly, has two states of a contact state in which the support cord 12a of the space holding cord 12 is in contact with the fabric of the upper fabric 6L and a non-contact state in which it is not in contact. The upper curtain 6U will be representatively described below. Fig. 5 is an enlarged side view of the periphery of the upper curtain 6U, showing a configuration of the first embodiment of the present invention in a contact state where the support cords 11a of the space maintaining cords 11 are in contact with each other at positions of the outdoor side creases (shown as "contact points") of the upper curtain 6U, in comparison with a configuration of a comparative example thereof. Fig. 6 is an enlarged side view of the periphery of the upper curtain 6U, showing a state in which the support cord 11a of the space holding cord 11 is not in contact with the outdoor side gather line of the upper curtain 6U, in which the configuration of the first embodiment of the present invention is compared with the configuration of the comparative example.

In this case, in the configuration of the first embodiment according to the present invention, the upper cord 6U is configured such that only the upper lift cord 3U having the cord diameter (cross-sectional diameter) D is inserted into the through hole 4U having the hole diameter D as shown in fig. 5a and 6 a, and the gap in the front-rear direction between the through hole 4U and the upper lift cord 3U is smaller than the bending diameter bd of the tip (bending portion) of the annular support cord 11a (circular cross-sectional diameter kd) provided at equal intervals on the pitch-maintaining cord 11 having the short diameter pd1 × the long diameter pd2 in the cord cross section regardless of whether the support cord 11a of the pitch-maintaining cord 11 and the fabric (fabric thickness sd) of the upper cord 6U are in a contact state. Similarly, in the lower curtain 6L, regardless of whether the support cord 12a of the pitch holding cord 12 and the fabric (fabric thickness sd) of the lower curtain 6L are in contact with each other, the gap in the front-rear direction between the penetration hole 4L and the upper lift cord 3L is smaller than the bending diameter bd of the tip (bent portion) of the end (bent portion) of the pitch holding cord 12 having the short diameter pd1 × the long diameter pd2 in the cord cross section, where a plurality of annular support cords 12a (circular cross-sectional diameter kd) are provided at equal intervals.

Further, the hole diameter D of the through hole 4U according to the present invention is smaller than the long diameter pd2 of the string section as the pitch maintaining string 11. Similarly, the hole diameter D of the through hole 4L according to the present invention is smaller than the long diameter pd2 of the string section of the pitch maintaining string 12. The gap in the front-rear direction between the insertion hole 4U and the upper lift cord 3U is smaller than 2 times the short diameter pd1 of the cord cross section of the bendable pitch retaining cord 11. Similarly, the gap in the front-rear direction between the insertion hole 4L and the lower lift cord 3L is smaller than 2 times the short diameter pd1 of the cord cross section of the bendable pitch retaining cord 12. The rope diameter d of the upper lift rope 3U according to the present invention is smaller than both the short diameter pd1 and the long diameter pd2 of the rope cross section of the pitch maintaining rope 11. Similarly, the rope diameter d of the lower lift rope 3L according to the present invention is smaller than both the short diameter pd1 and the long diameter pd2 of the rope cross section of the pitch maintaining rope 12. In addition, as compared with a state in which the curtain fabric 6 is inclined at substantially 45 ° from the horizontal, the aperture D of the through holes 4U, 4L according to the present invention is: the diameters (45 ° projected diameter Da) projected in the vertical direction or the horizontal direction when the upper and lower fabrics 6U, 6L are inclined at substantially 45 ° from the horizontal as shown in fig. 5 (a) and 6 (a) are 2 times or less the rope diameter d of the upper and lower lift ropes 3U, 3L, respectively.

In the configuration of the first embodiment according to the present invention, the same applies to the lower fabric 6L in which only the upper lift cord 3L having the cord diameter (cross-sectional diameter) D is inserted into the insertion hole 4L of the hole diameter D.

That is, with such a configuration, it is possible to suppress light leakage from the through hole 4U penetrating the upper lift cord 3U and light leakage from the through hole 4L penetrating the lower lift cord 3L.

(examples)

As a more specific suitable value in the example of the upper cord 6U shown in representative fig. 5 (a) and 6 (a), the cord diameter d of the upper lift cord 3U is set to

The diameter D of the through hole 4U is

The short diameter pd1 × the long diameter pd2 of the string section of the pitch maintaining string 11 is 0.8mm × 2.0mm, which has been conventionally used, respectively, the string diameter (section diameter) kd of the annular support string 11a having a circular section is Φ 0.2mm, and the bending diameter bd of the tip (bent portion) of the support string 11a is about 1.5mm in the above-described contact state and about 3mm in the non-contact state. The fabric thickness sd of the cord fabric 6 is about 0.2mm, which has been conventionally used.

In addition, similarly to the lower curtain cloth 6L, the lower lift cord 3L may have a cord diameter d of

The diameter D of the through hole 4L is

The short diameter pd1 x the long diameter pd2 of the string section of the pitch retaining string 11 were 0.8mm x 2.0mm, respectively, which were conventionally used, and the string diameter (cross-sectional diameter) kd of the circular supporting string 11a having a circular cross section was 0.8mm x 2.0mm

The bending diameter bd of the tip (bent portion) of the support string 11a is about 1.5mm in the contact state and about 3mm in the non-contact state. In addition, the fabric of the cord fabric 6The thickness sd is about 0.2mm which has been conventionally used.

According to the present embodiment, the diameter d of the rope is

The upper lifting rope 3U is inserted into the hole with the aperture

In the state of the insertion hole 4U in (a) in fig. 7, as shown in a fabric surface view, the gap between the insertion hole 4U and the upper lift cord 3U is approximately 0.81mm (D (1.8mm) -D2(0.7mm × √ 2)) to 1.10mm (D (1.8mm) -D1(0.7mm)) in the front-rear direction, and is smaller than either approximately 1.5mm in the contact state or approximately 3mm in the non-contact state as compared with the bending diameter bd of the tip (bent portion) of the annular support cord 11a extending in the rear direction. Therefore, the light leakage from the through hole 4U can be suppressed, and the support cord 11a cannot enter the through hole 4U (cannot be caught), that is, the movement of the upper curtain 6U is prevented from being obstructed when the upper curtain 6U is folded or stretched and lifted.

Further, the diameter of the through hole 4U

Is smaller than the major diameter pd2(2.0mm) of the string section as the pitch maintaining string 11. Then, the diameter d as a rope is

The upper lifting rope 3U is inserted into the hole with the aperture

In the state of the insertion hole 4U, the gap between the insertion hole 4U and the upper lift cord 3U is approximately 0.81mm to 1.10mm in the front-rear direction as described above, and is smaller than 2 times the short diameter pd1(0.8mm) of the cord cross section of the bendable pitch holding cord 11. Therefore, the light leakage from the through hole 4U can be suppressed, and the bendable space holding string 11 cannot penetrate through the through holeThe through holes 4U (not hooked) completely disappear when the upper fabric 6U is folded or stretched and the movement thereof is obstructed when it is lifted.

In this way, the insertion hole 4U is formed in such a size that the ropes (the pitch holding ropes 11 and the support ropes 11a thereof in this example) other than the upper raising/lowering rope 3U to be inserted cannot enter. Similarly, the insertion hole 4L is formed in such a size that the ropes (the pitch holding ropes 12 and the support ropes 12a thereof in this example) other than the lower raising/lowering rope 3L to be inserted cannot enter.

Further, the diameter of the through hole 4U

Larger than the rope diameter d of upper lift rope 3U, but formed as a result of this 45 ° projected diameter Da (1.8mm/√ 2 ≈ 1.27mm) of penetration hole 4U as the rope diameter of upper lift rope 3U

The diameter D of the upper lift cord 3U is smaller, and the diameter D is smaller. In other words, the rope diameter d of the upper lift rope 3U according to the present invention can be reduced with respect to both the short diameter pd1 and the long diameter pd2, which are rope cross sections of the pitch maintaining rope 11. In this way, since the light leakage from the through hole 4U can be suppressed and the penetration of the upper lift cord 3U into the through hole 4U can be maintained, both the cross-sectional area of the upper lift cord 3U and the area of the through hole 4U are smaller than those of the conventional cases. Accordingly, the movement of the upper fabric 6U during the raising and lowering is regulated to a preferable vertical direction, so that the movement deviation width (for example, the deviation in the left-right direction) of the upper fabric 6U during the raising and lowering is reduced, and the good appearance of the entire pleated curtain can be maintained. The same applies to the lower lift cord 3L and the through hole 4L.

Comparative example

On the other hand, in the structure of the comparative example, as shown in fig. 5 (b) and 6 (b), the respective rope diameters d 'of the upper lift rope 3U and the lower lift rope 3L (equal to the short diameter d 1' in the fabric surface view shown in fig. 4 (a)) are set to be the same

The aperture D' of the through hole 4U is

The diameter D' of the through hole 4L is 3.5 mm. The short diameter pd1 x the long diameter pd2 of the string section of the pitch retaining string 11 were 0.8mm x 2.0mm, respectively, and the string diameter (cross-sectional diameter) kd of the circular support string 11a having a circular cross section was 0.8mm x 2.0mm

The bending diameter bd of the tip (bent portion) of the support string 11a is about 1.5mm in the contact state and about 3mm in the non-contact state. In addition, the fabric thickness sd of the cord fabric 6 is about 0.2 mm. In the structure according to the comparative example, only the lower lift cord 3L is engaged with the support cord 11 a.

Therefore, the cord diameter d in the comparative example is

The upper lifting rope 3U and the lower lifting rope 3L are inserted into the hole with the aperture

In the state of the insertion hole 4U, as shown in a plane view of the fabric shown in fig. 4 (a), the gap between the insertion hole 4U and the upper and lower lift cords 3U and 3L is approximately 1.61mm (D '(5.0 mm) -2 × D2' (2 × 1.2mm × v 2)) to 2.60mm (D '(5.0 mm) -2 × D1' (2 × 1.2mm)) in the front-rear direction, and is larger than approximately 1.5mm when the tip (bent portion) of the annular support cord 11a extending rearward thereof is in the above-described contact state.

Therefore, the cord diameter d in the comparative example is

The lower lifting rope 3L is inserted into the hole with the aperture

In the state of the through-hole 4L, as shown in (a) of FIG. 4As shown in the plane view of the fabric, the gap between the insertion hole 4L and the lower lift cord 3L is approximately 1.80mm (approximately D '(3.5 mm) -D2' (1.2mm × √ 2)) -2.30 mm (approximately D '(3.5 mm) -D1' (1.2mm)) in the front-rear direction, and is larger than the bending diameter bd of the tip (bent portion) of the annular support cord 12a extending rearward thereof by approximately 1.5mm in the contact state.

Therefore, light leakage from the through holes 4U and 4L is increased, the support cord 11a can enter the through hole 4U, and the support cord 12a can enter the through hole 4L (may be hooked), that is, the movement of the upper curtain 6U or the lower curtain 6L when being folded or stretched to be lifted is hindered.

Further, the hole diameter of the through hole 4U according to the comparative example

And the diameter of the through hole 4L

A short diameter pd1 x a long diameter pd2 of the rope section of each of the bendable pitch-maintaining ropes 11, 12

2 times larger. The gap between the through hole 4U and the upper and lower lift cords 3U, 3L is approximately 1.61mm to 2.60mm in the front-rear direction as described above, and the gap between the through hole 4L and the lower lift cord 3L is approximately 1.80mm to 2.30mm in the front-rear direction as described above, which is larger than 2 times the short diameter pd1(0.8mm) of the cord cross section of the bendable pitch-retaining cords 11, 12. Therefore, light leakage from the through holes 4U, 4L is increased, and the bendable pitch holding strings 11, 12 enter (may be hooked on) the through holes 4U, 4L, respectively, that is, hinder the operation of folding or stretching the upper curtain 6U or the lower curtain 6L when it is lifted or lowered.

Further, the hole diameter of the through hole 4U according to the comparative example

And the diameter of the through hole 4L

As shown in FIG. 5 (b) and FIG. 6 (b), the 45 ° projected diameter Da "((5.0 mm/√ 2 ≈ 3.54mm) of the through-hole 4U is larger than the cord diameter of the upper side elevation cord 3U

Is 2 times larger, and likewise, the 45 ° projected diameter Da' (3.5mm/√ 2 ≈ 2.47mm) of the through-hole 4L is larger than the cord diameter of the lower lift cord 3L

The light leakage from the through holes 4U, 4L is increased by 2 times, and the cross-sectional areas of the upper lift cord 3U and the lower lift cord 3L and the areas of the corresponding through holes 4U, 4L are both larger than those of the embodiment of the present invention, and the width of the movement deviation (for example, the deviation in the left-right direction) of the upper curtain 6U or the lower curtain 6L during the lifting operation is relatively increased.

As described above, in the pleated curtain of the first embodiment shown in fig. 1 and 2, the through holes 4U and 4L for inserting only the upper lifting cord 3U and the lower lifting cord 3L provided in the upper curtain 6U and the lower curtain 6L are extremely small in size, and can accommodate only one of the upper lifting cord 3U and the lower lifting cord 3L, and there is no space for accommodating other cords or the like, so that the lifting performance is not hindered, but rather, the blind curtain is improved, and light leakage from the through holes 4U and 4L can be reduced.

Further, in the pleated curtain of the first embodiment, since both the sectional areas of the upper lift cord 3U and the lower lift cord 3L and the areas of the corresponding through holes 4U and 4L are smaller than those of the conventional art, the movement of the upper curtain 6U or the lower curtain 6L during the lifting can be regulated to a preferable vertical direction, so that the movement deviation width (for example, the deviation in the left-right direction) of the upper curtain 6U or the lower curtain 6L during the lifting can be reduced, and the overall appearance of the pleated curtain can be maintained in a good state (the dynamic design can be improved).

Furthermore, since the upper curtain 6U does not need to have a through hole for inserting the lower lift cord 3L, light leakage can be suppressed, and as can be understood from the front view shown in fig. 2 (a), by providing the upper lift cord 3U and the lower lift cord 3L in a straight line, the appearance can be improved (static design can be improved).

In the example of the upper curtain 6U shown in fig. 5 (a) and 6 (a), only the upper lift cord 3U is engaged with and inserted into the annular support cord 11a of the pitch retaining cord 11, but as in modification 1 shown in fig. 7 (a), an engagement piece 61 is formed by welding or the like on the back surface side of the upper curtain 6U, and the lower lift cord 3L is inserted into the insertion hole 62 provided in the engagement piece 61, so that the pitch retaining cord 11 may not be used. This can completely eliminate the penetration of the through-hole 4U by the space holding string 11 or the support string 11 a.

Further, as in modification 2 shown in fig. 7 (b), the lower lift cord 3L is inserted through the insertion hole 62 provided in the engagement piece 61, and both the upper lift cord 3U and the lower lift cord 3L are inserted into the loop-shaped support cord 11a on the pitch maintaining cord 11 in an engaged manner. This can prevent the bending diameter bd of the support string 11a from being unnecessarily shortened, and can further suppress the penetration of the support string 11a into the through hole 4U.

Further, as in modification 3 shown in fig. 7 (c), the following configuration may be adopted: the lower lifting rope 3L is inserted through the insertion hole 62 provided in the engagement piece 61, and only the lower lifting rope 3L is inserted through the annular support rope 11a on the pitch maintaining rope 11. This makes it possible to shorten the support string 11a, and further suppresses the penetration of the support string 11a into the through-hole 4U.

[ second embodiment ]

Next, a blind of a second embodiment having an upper curtain 6U and a lower curtain 6L will be described with reference to fig. 8. In addition, the same members as those of the first embodiment are denoted by the same reference symbols.

The pleated cover of the second embodiment shown in fig. 8 is different from the first embodiment in that the position of the through hole 4U provided in the upper curtain 6U is shifted to the indoor side compared to the through hole 4L provided in the lower curtain 6L, and is otherwise the same as the first embodiment.

That is, as shown in fig. 8 (b), the lower lift cord 3L, which is led out from the upper beam 1 and is inserted into the through hole 4L provided in the substantially central portion of the width of the lower curtain 6L in the longitudinal direction, hangs down on the rear surface of the upper curtain 6U while bypassing through the rear surface of the intermediate rail 5, without being inserted into the through hole 4U provided in the upper curtain 6U, as in the first embodiment, but the upper lift cord 3U is supported by being suspended from the upper beam 1 so as to be offset to the indoor side, unlike the first embodiment.

Therefore, the upper lift cord 3U is positioned in front of the upper curtain 6U so as to hang down forward from the substantially central portion of the width (shown width 2 × a) of the intermediate rail 5 in the front-rear direction and support the intermediate rail 5 at a distance b (< a) from the front surface of the intermediate rail 5 with respect to the through hole 4U. Thus, even if the lower lift cord 3L hangs down while detouring through the back surface of the intermediate rail 5, the inclination of the intermediate rail 5 can be suppressed and kept substantially horizontal.

The blind of the second embodiment has the same configuration as that of the first embodiment in terms of the hole diameters of the through holes 4U and 4L, the cord diameters of the upper lift cord 3U and the lower lift cord 3L, and the arrangement positions of the front views of the upper lift cord 3U and the lower lift cord 3L.

Therefore, the pleated cover of the second embodiment includes all the advantages of the first embodiment described above, and can keep the intermediate rail 5 substantially horizontal while suppressing the inclination thereof.

[ third embodiment ]

Next, a blind of a third embodiment having an upper cord 6U and a lower cord 6L will be described with reference to fig. 9. The same members as those of the first embodiment are denoted by the same reference numerals.

The blind of the third embodiment shown in fig. 9 is different from the first embodiment in the following points, and is otherwise the same as the first embodiment, and the following points are: both the through hole 4U and the through hole 4L are provided in substantially central portions of the front-rear direction widths of the upper curtain 6U and the lower curtain 6L, respectively, and the lower lifting cord 3L is inserted through both the through hole 4U of the upper curtain 6U and the through hole 4L of the lower curtain 6L, so that the upper lifting cord 3L hangs down on the back surface side of the upper curtain 6U.

That is, as shown in fig. 9 (b), the lower lift cord 3L suspended from the upper beam 1 is inserted into the insertion hole 4U of the upper fabric 6U, then inserted through the intermediate rail 5 via the insertion path 5a formed at the substantially central portion of the width (shown width 2 × a) in the front-rear direction of the intermediate rail 5, and then inserted into the insertion hole 4L of the lower fabric 6L and connected to the bottom rail 7.

On the other hand, the upper side lift cord 3U hanging down from the upper beam 1 hangs down on the back side of the upper curtain 6U, and is connected to the intermediate rail 5. As a method of hanging the lift cord on the back side of the upper curtain 6U, methods shown in fig. 5 (a), 6 (a), or 7 (a), (b), and (c) can be applied.

Therefore, the formation positions of the through holes 4U, 4L with respect to the respective fabrics can be the same as in the first embodiment, but only the lower lift cord 3L is inserted into the through holes 4U, 4L, and the lower lift cord 3L linearly hangs down from the upper beam 1 through the intermediate rail 5 toward the bottom rail 7, so that the inclination of the intermediate rail 5 can be suppressed and the intermediate rail 5 can be kept substantially horizontal.

Further, the upper lift cord 3U hanging down from the upper beam 1 is connected to the intermediate rail 5 so as to hang down on the back surface side of the upper curtain 6U and support the intermediate rail 5 at a distance b (< a) from the back surface of the intermediate rail 5, and therefore, no through hole for inserting the upper lift cord 3U is provided for the upper curtain 6U.

In the pleated cover of the third embodiment, the hole diameters of the through holes 4U, 4L, the cord diameters of the upper lift cord 3U and the lower lift cord 3L, and the arrangement positions of the front views of the upper lift cord 3U and the lower lift cord 3L can be configured similarly to the first embodiment.

Therefore, the pleated cover of the third embodiment includes all the advantages of the first embodiment described above, and can keep the intermediate rail 5 substantially horizontal while suppressing the inclination thereof.

[ fourth embodiment ]

Next, a blind of a fourth embodiment having an upper cord 6U and a lower cord 6L will be described with reference to fig. 10. The same members as those of the first embodiment are denoted by the same reference numerals.

The blind of the fourth embodiment shown in fig. 10 is different from the first embodiment in the following points, and is otherwise the same as the second embodiment in the following points: in the substantially central portion of the longitudinal width of the upper curtain 6U, a first through hole 4U through which the lower lifting cord 3L is inserted and a second through hole 4U through which the upper lifting cord 3U is inserted are provided in parallel in the front-rear direction, and the through hole 4L is provided in the substantially central portion of the longitudinal width of the lower curtain 6L, and not only the upper lifting cord 3U but also the lower lifting cord 3L hang down from the upper beam 1 through the intermediate rail 5 to the bottom rail 7 in the substantially central portion of the longitudinal width of the upper curtain 6U and the lower curtain 6L.

That is, as shown in the fabric surface view of fig. 10 (a), the first insertion hole 4U through which the lower lift cord 3L is inserted and the second insertion hole 4U through which the upper lift cord 3U is inserted are provided in the upper curtain 6U in parallel in the front-rear direction at substantially the center of the width in the front-rear direction. In the lower curtain 6L, as in the first embodiment, a through hole 4L through which the lower lift cord 3L is inserted is provided in a substantially central portion of the longitudinal width thereof.

As shown in fig. 10 (b), the lower lift cord 3L suspended from the upper beam 1 is inserted into the first through hole 4U of the upper fabric 6U, then, is inserted through the intermediate rail 5 via a through passage 5a formed at a substantially central portion of the intermediate rail 5 in the front-rear direction width (shown as width 2 × a), and is then inserted into the through hole 4L of the lower fabric 6L and connected to the bottom rail 7.

On the other hand, the upper side lift cord 3U suspended from the upper beam 1 is inserted into the second insertion hole 4U of the upper curtain 6U and connected to the intermediate rail 5, as in the first embodiment.

Therefore, only the lower lift cord 3L is inserted through one of the pair of insertion holes 4U arranged in parallel in the front-rear direction in the upper curtain 6U and the insertion hole 4L in the lower curtain 6L, and the lower lift cord 3L linearly hangs down from the upper beam 1 through the intermediate rail 5 toward the bottom rail 7, so that the inclination of the intermediate rail 5 can be suppressed and kept substantially horizontal.

Then, only the upper lifting cord 3U hanging from the upper beam 1 is inserted into the other of the pair of insertion holes 4U in the upper curtain 6U.

In the pleated cover of the fourth embodiment, the hole diameters of the through holes 4U and 4L, the cord diameters of the upper lift cord 3U and the lower lift cord 3L, and the arrangement positions of the front views of the upper lift cord 3U and the lower lift cord 3L can be configured similarly to the first embodiment.

Therefore, the pleated cover of the fourth embodiment includes all the advantages of the first embodiment described above, and can keep the intermediate rail 5 substantially horizontal while suppressing the inclination thereof.

In the example of the present embodiment, the example has been described in which the lower lift cord 3L is linearly suspended from the upper member 1 via the intermediate rail 5 until it is connected to the bottom rail 7 by providing the pair of through holes 4U, which are provided in parallel in the front-rear direction and through which the lower lift cord 3L and the upper lift cord 3U are inserted, at the substantially central portion of the front-rear direction width of the upper curtain 6U as shown in fig. 11 (a), but the interval between the pair of through holes 4U may be formed so as to be separated in the front-rear direction width of the upper curtain 6U as shown in fig. 11 (b), and in this case, the lower lift cord 3L may be configured to be suspended so as to detour on the rear surface of the intermediate rail 5.

[ other embodiments ]

Further, the following embodiments can be adopted by further developing the examples and the modifications of the above embodiments. In the embodiment in which the lower lift cord 3L is suspended so as to detour around the back surface of the intermediate rail 5, the lower lift cord 3L is engaged with the lower fabric 6L more linearly so as to reduce interference resistance with the intermediate rail 5 and to improve the lifting performance of the lower fabric 6L.

For example, as a typical modification of the first embodiment, embodiments of examples 1 to 6 are shown in fig. 12 to 14 in a simplified manner, and the following description is made in order.

(example 1)

First, as shown in fig. 12 (a), in the embodiment of example 1, the upper lifting cord 3U for lifting and lowering the upper curtain 6U is inserted into the through hole 4U of the upper curtain 6U, and the lower lifting cord 3L for lifting and lowering the lower curtain 6L is inserted into the through hole 4L formed at a position shifted rearward from the center of the width in the front-rear direction of the lower curtain 6L while detouring through the back surface of the intermediate rail 5, without being inserted into the through hole 4U of the upper curtain 6U.

The through hole 4U of the upper cord 6U in the embodiment of example 1 shown in fig. 12 (a) is not limited, and in this example, the structure is: each layer (each layer is a portion in which japanese character "く" is written) of the upper fabric 6U, which is folded in a zigzag manner in the vertical direction into a plurality of layers, is formed at the center of the width in the longitudinal direction of the upper fabric 6U, and the upper lift cord 3U is suspended at the approximate center of the width in the longitudinal direction (the illustrated width is 2 × a) of the intermediate rail 5.

On the other hand, the through hole 4L of the lower cord 6L in the embodiment of example 1 shown in fig. 12 (a) is configured to: each layer of the lower curtain cloth 6L which is folded in a zigzag manner in the vertical direction (each layer is a portion in the shape of japanese "く") is formed at a position which is offset rearward from the center of the width of the lower curtain cloth 6L in the vertical direction, that is, at a position of the lower curtain cloth 6L in the vertical direction which is a length b ' from the front and a position of a length c ' (< b ') from the rear, and the hole center of the through hole 4L is located at this position. The lower lift cord 3L hangs down at a position of length b from the front and a position of length c (< b) from the rear in the front-rear direction of the intermediate rail 5.

In the embodiment of example 1 shown in fig. 12 (a), the fabric widths of the upper fabric 6U and the lower fabric 6L in the front-rear direction are made equal, and the position O at the center of the width of the upper fabric 6U in the front-rear direction is made equal to the position O' at the center of the width of the lower fabric 6L in the front-rear direction, so that the upper fabric 6U and the lower fabric 6L are hardly displaced in the front-rear direction when the upper fabric 6U and the lower fabric 6L are folded, respectively.

As described above, when the lower lift cord 3L is suspended so as to detour on the back surface of the intermediate rail 5 by inserting the lower lift cord 3L into the through hole 4L formed at a position shifted rearward from the center of the width of the lower curtain 6L in the front-rear direction, the lower lift cord 3L can be engaged with the lower curtain 6L more linearly and suspended, and the resistance to interference with the intermediate rail 5 can be reduced or the lifting performance of the lower curtain 6L can be improved.

(example 2)

Next, in the embodiment of example 2 shown in fig. 12 (b), the upper raising/lowering cord 3U for raising/lowering the upper curtain 6U is inserted into the through hole 4U of the upper curtain 6U, and the lower raising/lowering cord 3L for raising/lowering the lower curtain 6L is inserted into the through hole 4L formed in the center of the width in the front-rear direction of the lower curtain 6L via the back surface of the intermediate rail 5 without being inserted into the through hole 4U of the upper curtain 6U after the lower curtain 6L is offset rearward from the upper curtain 6U.

The through hole 4U of the upper cord 6U in the embodiment of example 2 shown in fig. 12 (b) is not limited, and in this example, the structure is: each layer (each layer is a portion in which japanese character "く" is written) of the upper fabric 6U, which is folded in a zigzag manner in the vertical direction into a plurality of layers, is formed at the center of the width in the longitudinal direction of the upper fabric 6U, and the upper lift cord 3U is suspended at the approximate center of the width in the longitudinal direction (the illustrated width is 2 × a) of the intermediate rail 5.

On the other hand, the through hole 4L of the lower curtain 6L in the embodiment of example 2 shown in fig. 12 (b) is configured such that: in each layer of the lower fabric 6L which is folded in a zigzag manner in the vertical direction (each layer is a portion in the japanese character "く"), the center of the width in the longitudinal direction of the lower fabric 6L, that is, the center of the hole of the through hole 4L is located at the center of the width in the longitudinal direction of each layer of the lower fabric 6L (at a position which is a' length from the longitudinal direction).

In the embodiment of example 2 shown in fig. 12 (b), the following configurations are adopted: the fabric width of the upper fabric 6U and the fabric width of the lower fabric 6L in the front-rear direction are made equal, the position O' of the center of the width of the lower fabric 6L in the front-rear direction is shifted rearward by a length d (>0) from the position O of the center of the width of the upper fabric 6U in the front-rear direction, and the lower lift cord 3L hangs down at a position b from the front of the center rail 5 in the front-rear direction and at a position c (< b) from the rear. Thus, when the upper fabric 6U and the lower fabric 6L are folded, the upper fabric 6U and the lower fabric 6L are allowed to be displaced in the front-rear direction.

As described above, by configuring the lower fabric 6L to be offset rearward relative to the upper fabric 6U, when the lower lift cord 3L is suspended so as to detour on the back surface of the intermediate rail 5, the lower lift cord 3L can be engaged with the lower fabric 6L more linearly and suspended, and the interference resistance with the intermediate rail 5 can be reduced or the lifting performance of the lower fabric 6L can be improved.

(example 3)

Next, in the embodiment of example 3 shown in fig. 13 (a), the upper lifting cord 3U for lifting and lowering the upper curtain 6U is inserted into the through hole 4U of the upper curtain 6U, the lower curtain 6L is formed to have a width in the front-rear direction larger than that of the upper curtain 6U, and the lower lifting cord 3L for lifting and lowering the lower curtain 6L is inserted into the through hole 4L formed at the center of the width in the front-rear direction of the lower curtain 6L while bypassing through the back surface of the intermediate rail 5, without being inserted into the through hole 4U of the upper curtain 6U.

The through hole 4U of the upper cord 6U in the embodiment of example 3 shown in fig. 13 (a) is not limited, and in this example, the structure is: each layer (each layer is a portion in which japanese character "く" is written) of the upper fabric 6U, which is folded in a zigzag manner in the vertical direction into a plurality of layers, is formed at the center of the width in the longitudinal direction of the upper fabric 6U, and the upper lift cord 3U is suspended at the approximate center of the width in the longitudinal direction (the illustrated width is 2 × a) of the intermediate rail 5.

On the other hand, the through hole 4L of the lower curtain 6L in the embodiment of example 3 shown in fig. 13 (a) is configured to: each layer of the lower cord 6L that is folded in a zigzag manner in the vertical direction (each layer is a portion in the shape of japanese "く") is formed at a position that is offset rearward from the center of the width of the lower cord 6L in the longitudinal direction, that is, the hole center of the through hole 4L is located at a position that is a length b ' from the front and a length c ' (< b ') from the rear in the longitudinal direction of each layer of the lower cord 6L.

In particular, in the embodiment of example 3 shown in fig. 13 (a), the lower fabric 6L is formed to have a larger width in the front-rear direction than the upper fabric 6U. Therefore, the lower lifting cord 3L for lifting the lower fabric 6L can be suspended from the rear of the upper fabric 6U to the rear of the lower fabric 6L via the back surface of the intermediate rail 5 without bending.

In the embodiment of example 3 shown in fig. 13 (a), the following configuration is adopted: the lower curtain 6L is wider in the front-rear direction than the upper curtain 6U, and in addition, the position of the position O' of the center of the front-rear direction width of the lower curtain 6L is shifted rearward by a length d (>0) from the position O of the center of the front-rear direction width of the upper curtain 6U, and the lower lift cord 3L hangs down at a position b from the front of the front-rear direction length of the intermediate rail 5 and at a position c (< b) from the rear.

In the embodiment of example 3 shown in fig. 13 (a), the configuration may be such that: in addition to the fact that the width of the lower curtain 6L in the front-rear direction is larger than that of the upper curtain 6U, as shown in example 1 in fig. 12 (a), the position O at the center of the width of the upper curtain 6U in the front-rear direction is set to be the same position as the position O' at the center of the width of the lower curtain 6L in the front-rear direction, and the lower lift cord 3L hangs down at a position apart from the front length b in the front-rear direction of the intermediate rail 5 and at a position apart from the rear length c (< b).

As described above, since the lower fabric 6L is configured to have a width in the front-rear direction larger than that of the upper fabric 6U, when the lower lift cord 3L is suspended so as to detour on the back surface of the intermediate rail 5, the lower lift cord 3L can be engaged with the lower fabric 6L almost linearly and suspended, and interference resistance with the intermediate rail 5 can be reduced or lifting performance of the lower fabric 6L can be improved.

(example 4)

Next, in the embodiment of example 4 shown in fig. 13(b), the upper lifting cord 3U for lifting and lowering the upper curtain 6U is inserted into the through hole 4U of the upper curtain 6U, and the lower lifting cord 3L for lifting and lowering the lower curtain 6L is inserted into the through hole 62 formed in the engaging piece 61 via the back surface of the intermediate rail 5 so as to detour, without being inserted into the through hole 4U of the upper curtain 6U, wherein the engaging piece 61 is provided at the rear end portion of each layer of the lower curtain 6L which is folded in a zigzag manner in the vertical direction into a plurality of layers. Although the lower fabric 6L is shown as fabric in which the engaging piece 61 is provided at the rear end of each layer of the lower fabric 6L, the engaging piece 61 may be provided at the front end of each layer as well as at the rear end of each layer.

The through hole 4U of the upper cord 6U in the embodiment of example 4 shown in fig. 13(b) is not limited, and in this example, the structure is: each layer (each layer is a portion in which japanese character "く" is written) of the upper fabric 6U, which is folded in a zigzag manner in the vertical direction into a plurality of layers, is formed at the center of the width in the longitudinal direction of the upper fabric 6U, and the upper lift cord 3U is suspended at the approximate center of the width in the longitudinal direction (the illustrated width is 2 × a) of the intermediate rail 5.

On the other hand, the lower lift cord 3L is inserted into the insertion hole 62 without being inserted into the insertion hole 4U of the upper curtain 6U, and is inserted into the insertion hole 62 while winding around through the back surface of the intermediate rail 5, wherein the insertion hole 62 is provided in the engagement piece 61 of each layer (each layer is a portion of japanese character "く") of the lower curtain 6L that is bent in a zigzag shape in the vertical direction.

In the embodiment of example 4 shown in fig. 13(b), the fabric widths in the front-rear direction of the upper fabric 6U and the lower fabric 6L may be different from each other or the same, and the position O of the center in the front-rear direction width of the upper fabric 6U may be the same as the position O 'of the center in the front-rear direction width of the lower fabric 6L, but the position O' of the center in the front-rear direction width of the lower fabric 6L may be shifted rearward or forward from the position O of the center in the front-rear direction width of the upper fabric 6U.

As described above, with the configuration in which the lower lift cord 3L is inserted into the insertion hole 62 provided in the engagement piece 61 of each layer of the lower curtain 6L, when the lower lift cord 3L is suspended so as to detour on the back surface of the intermediate rail 5, the lower lift cord 3L can be engaged with the lower curtain 6L almost linearly and suspended, and it is possible to reduce interference resistance with the intermediate rail 5 and improve the lifting performance of the lower curtain 6L.

In the embodiment of example 4 shown in fig. 13(b), since the through-holes 4L are not provided in the lower fabric 6L, light leakage from the through-holes 4L does not occur, and this embodiment is particularly effective when the lower fabric 6L is formed of a natural-fold fabric having light-shielding properties.

(example 5)

Next, in the embodiment of example 5 shown in fig. 14 (a), the upper lifting cord 3U for lifting and lowering the upper fabric 6U is inserted into the through hole 4U of the upper fabric 6U, and the lower lifting cord 3L for lifting and lowering the lower fabric 6L is inserted into the through hole 4L via the back surface of the intermediate rail 5 without being inserted into the through hole 4U of the upper fabric 6U, and the through hole 4L is formed in each layer provided in the lower fabric 6L and bent in a zigzag manner in the vertical direction. Further, the through holes 4L of the respective layers of the lower fabric 6L are formed in: a position where a part or all of the uppermost layer is shifted from the rear to the front as it goes from the uppermost layer to the lower layer.

The through hole 4U of the upper cord 6U in the embodiment of example 5 shown in fig. 14 (a) is not limited, and in this example, the structure is: each layer (each layer is a portion in which japanese character "く" is written) of the upper fabric 6U, which is folded in a zigzag manner in the vertical direction into a plurality of layers, is formed at the center of the width in the longitudinal direction of the upper fabric 6U, and the upper lift cord 3U is suspended at the approximate center of the width in the longitudinal direction (the illustrated width is 2 × a) of the intermediate rail 5.

On the other hand, the through hole 4L of the lower ply 6L in the embodiment of example 5 shown in fig. 14 (a) includes a through hole formed as follows: that is, the through holes are formed in the respective layers (each layer is a portion in japanese character く) of the lower curtain 6L which are folded in a zigzag manner in the vertical direction, such that the positions of the through holes which are offset rearward from the front-rear direction width center with the movement from the uppermost layer toward the lower layer are gradually displaced toward the front-rear direction width center.

Namely, as shown in the figure, the following are included: the through-holes 4L are formed so as to be displaced from the uppermost layer of the lower ply 6L toward the lower layer to positions having lengths c1 ', c2 ' (> c1 '), c3 ' (> c2 '), c4 ' (> c3 '), and c5 ' (> c4 ') from the rear end of each layer. The length c5 'is shorter than the length b' from the front end in the front-rear direction of the layer.

In this example, the hole center of the through hole 4L is located at the center of the front-rear direction width (the position where the length is a 'from the front-rear direction) in the lower layer of the layer where the through hole 4L is formed at the position c 5', and in short, the upper lift cord 3U is suspended at the substantially center of the front-rear direction width (the illustrated width is 2 × a) of the intermediate rail 5.

In the embodiment of example 5 shown in fig. 14 (b), the fabric widths in the front-rear direction of the upper fabric 6U and the lower fabric 6L may be different from each other or the same, and the position O of the center in the front-rear direction width of the upper fabric 6U may be the same as the position O 'of the center in the front-rear direction width of the lower fabric 6L, but the position O' of the center in the front-rear direction width of the lower fabric 6L may be shifted rearward or forward from the position O of the center in the front-rear direction width of the upper fabric 6U.

In this way, the through hole is configured to include: that is, the through-holes formed in such a manner that the positions of the through-holes shifted rearward from the front-rear direction width center with the movement from the uppermost layer of the lower curtain 6L toward the lower layer are gradually shifted toward the front-rear direction width center, whereby when the lower lift cord 3L is caused to hang down while winding on the back surface of the intermediate rail 5, the lower lift cord 3L can be engaged with the lower curtain 6L more linearly and can hang down, and the interference resistance with the intermediate rail 5 can be alleviated or the lifting performance of the lower curtain 6L can be improved.

(example 6)

Next, in the embodiment of example 6 shown in fig. 14 (b), the upper lifting cord 3U for lifting and lowering the upper fabric 6U is inserted into the through hole 4U of the upper fabric 6U, and the lower lifting cord 3L for lifting and lowering the lower fabric 6L is inserted into the through hole 4L provided below a predetermined layer including at least the uppermost layer of the plurality of layers of the lower fabric 6L bent in a zigzag manner in the vertical direction, and hangs down behind the predetermined layer on the lower fabric 6L via the back surface of the intermediate rail 5 without being inserted into the through hole 4U of the upper fabric 6U, and is inserted into the through hole 4L provided below the predetermined layer.

The through hole 4U of the upper cord 6U in the embodiment of example 6 shown in fig. 14 (b) is not limited, and in this example, the structure is: each layer (each layer is a portion in which japanese character "く" is written) of the upper fabric 6U, which is folded in a zigzag manner in the vertical direction into a plurality of layers, is formed at the center of the width in the longitudinal direction of the upper fabric 6U, and the upper lift cord 3U is suspended at the approximate center of the width in the longitudinal direction (the illustrated width is 2 × a) of the intermediate rail 5.

On the other hand, the through hole 4L of the lower cord 6L in the embodiment of example 6 shown in fig. 14 (b) includes through holes formed as follows: that is, the through holes are formed in the respective layers (each layer is a portion in japanese character く) of the lower curtain 6L which are folded in a zigzag manner in the vertical direction, such that the positions of the through holes which are offset rearward from the front-rear direction width center with the movement from the uppermost layer toward the lower layer are gradually displaced toward the front-rear direction width center.

That is, the illustrated example includes: the through-hole 4L is formed at a position displaced from the rear end of the uppermost layer of the lower curtain 6L by the lengths c1 ', c2 ' (> c1 '), and c3 ' (> c2 ') as the layer directly below the uppermost layer is moved toward the lower layer. The length c3 'is shorter than the length b' from the front end in the front-rear direction of the layer.

In this example, although not limited thereto, the hole center of the through hole 4L is located at the center of the front-rear direction width (the position where the length is a 'from the front-rear direction) below the layer where the through hole 4L is formed at the position c 3', and in short, the upper lift cord 3U is suspended at the substantially center of the front-rear direction width (the illustrated width is 2 × a) of the intermediate rail 5.

As a central idea of the embodiment of example 6 shown in fig. 14 (b), the lower lift cord 3L may be suspended behind at least the uppermost layer of the lower curtain 6L, and the position of the through hole 4L in the layer below the layer suspended behind may satisfy c1 '═ c 2' ═ c3 '≦ a'.

In the embodiment of example 6 shown in fig. 14 (b), the fabric widths in the front-rear direction of the upper fabric 6U and the lower fabric 6L may be different from each other or the same, and the position O of the center in the front-rear direction width of the upper fabric 6U may be the same as the position O 'of the center in the front-rear direction width of the lower fabric 6L, but the position O' of the center in the front-rear direction width of the lower fabric 6L may be shifted rearward or forward from the position O of the center in the front-rear direction width of the upper fabric 6U.

As described above, by adopting the configuration in which the lower lift cord 3L hangs down behind the predetermined layer including at least the uppermost layer of the lower curtain 6L, when the lower lift cord 3L is caused to hang down while winding on the back surface of the intermediate rail 5, the lower lift cord 3 can be engaged with the lower curtain 6L more linearly and hang down, and the interference resistance with the intermediate rail 5 can be reduced or the lifting performance of the lower curtain 6L can be improved.

As described above, according to the embodiments of examples 1 to 6 shown in fig. 12 to 14, when the lower lift cord 3L is suspended to extend around the back surface of the intermediate rail 5, the interference resistance with the intermediate rail 5 can be reduced or the lifting performance of the lower fabric 6L can be improved. Examples 1 to 6 shown in fig. 12 to 14 can be combined as appropriate to form another embodiment. Further, the present invention is not limited to the embodiment further developed from the first embodiment, and examples 1 to 6 shown in fig. 12 to 14, or an appropriate combination of these may be further applied to other embodiments.

The present invention has been described above by way of examples of specific embodiments, but the present invention is not limited to the above examples of embodiments, and various modifications can be made without departing from the technical spirit thereof. For example, although the blind of the specific embodiment in which the curtain is suspended and supported from the upper frame so as to be able to be folded in the vertical direction has been described, the blind of the other embodiment in which the curtain is suspended in the vertical direction or in the front-rear direction may be used, or the curtain having a structure in which a plurality of honeycomb-like bodies are connected in the vertical direction and which is suspended and supported from the upper frame so as to be able to be lifted.

In the above embodiment, a specific example of the operation method related to the raising and lowering of the fabric has been described, but any form may be used regardless of the manual operation and the electric operation.

In the fourth embodiment, as a preferable example, an example in which the first through-hole 4U through which the lifting/lowering cord 3U of the upper fabric 6U is inserted and the second through-hole 4L through which the lifting/lowering cord 3L of the lower fabric 6L is inserted are formed in parallel in the longitudinal direction with respect to the upper fabric 6U has been described, but a mode in which the through-holes 4U and the lifting/lowering cords 3L are arranged in parallel in the lateral direction may be adopted in which an effect of suppressing light leakage due to a reduction in diameter of the through-holes 4U and a reduction in diameter of the lifting/ lowering cords 3U, 3L is produced, and an effect of suppressing inclination of the intermediate rail 5 may be produced by forming either one or both of a pair of through-holes 4U arranged in parallel in the lateral direction at a position offset from a substantially central portion in the longitudinal direction of the upper fabric 6U.

(availability in industry)

According to the present invention, light leakage can be suppressed, and in particular, design properties can be improved, and the present invention is useful for a blind application.

Claims (12)

1. A blind including an upper curtain fabric and a lower curtain fabric that are respectively movable up and down by a plurality of lift cords, the blind characterized in that:

a first lifting rope for lifting one of the upper curtain cloth and the lower curtain cloth is inserted into the through hole of the upper curtain cloth,

a second lifting rope for lifting the other of the upper curtain cloth and the lower curtain cloth is not inserted into the through hole of the upper curtain cloth;

the lower end of the upper curtain cloth is mounted on the upper surface of the middle rail, the upper end of the lower curtain cloth is mounted on the lower surface of the middle rail, the first lifting rope lifts the middle rail, and the second lifting rope hangs down on the back surface of the upper curtain cloth in a winding manner through the back surface of the middle rail.

2. A pleated cover according to claim 1,

the second lifting rope is inserted into the through hole of the lower curtain cloth.

3. A pleated cover according to claim 1,

the specified value of the diameter of the through hole is set to be 1.8mm,

the predetermined value of the diameter of each of the first lifting rope and the second lifting rope is set to 0.7 mm.

4. A pleated cover according to claim 1,

the through hole of the upper curtain cloth is formed at a position deviated from the approximate center of the upper curtain cloth in the front-back direction.

5. A pleated cover according to claim 1,

the through-hole of the upper curtain cloth is formed at a position offset in the front-rear direction with respect to the through-hole of the lower curtain cloth.

6. A pleated cover according to any one of claims 1 to 5,

the blind is provided with a spacing holding rope for holding the upper curtain cloth at a specified spacing,

the second lift cord is inserted into a loop-shaped support cord disposed on the spacing maintaining cord.

7. A pleated curtain comprising an upper curtain fabric and a lower curtain fabric which are respectively liftable by a plurality of lifting cords, characterized in that,

a first lifting rope for lifting the upper curtain cloth is inserted in the through hole of the upper curtain cloth,

a second lifting rope for lifting the lower curtain cloth is inserted into the through hole formed at the position deviated from the center of the width of the lower curtain cloth in the front-rear direction rearward without being inserted into the through hole of the upper curtain cloth;

the lower end of the upper curtain cloth is mounted on the upper surface of the middle rail, the upper end of the lower curtain cloth is mounted on the lower surface of the middle rail, the first lifting rope lifts the middle rail, and the second lifting rope hangs down on the back surface of the upper curtain cloth in a winding manner through the back surface of the middle rail.

8. A pleated curtain comprising an upper curtain fabric and a lower curtain fabric which are respectively liftable by a plurality of lifting cords, characterized in that,

a first lifting rope for lifting the upper curtain cloth is inserted in the through hole of the upper curtain cloth,

the lower curtain cloth is deviated backward than the upper curtain cloth, and a second lifting rope for lifting the lower curtain cloth is inserted into the through hole of the lower curtain cloth instead of the through hole of the upper curtain cloth;

the lower end of the upper curtain cloth is mounted on the upper surface of the middle rail, the upper end of the lower curtain cloth is mounted on the lower surface of the middle rail, the first lifting rope lifts the middle rail, and the second lifting rope hangs down on the back surface of the upper curtain cloth in a winding manner through the back surface of the middle rail.

9. A pleated curtain comprising an upper curtain fabric and a lower curtain fabric which are respectively liftable by a plurality of lifting cords, characterized in that,

a first lifting rope for lifting the upper curtain cloth is inserted in the through hole of the upper curtain cloth,

the lower curtain cloth is formed to have a width in the front-rear direction larger than that of the upper curtain cloth,

the second lifting rope used for lifting the lower curtain cloth is not inserted into the through hole of the upper curtain cloth, but inserted into the through hole of the lower curtain cloth;

the lower end of the upper curtain cloth is mounted on the upper surface of the middle rail, the upper end of the lower curtain cloth is mounted on the lower surface of the middle rail, the first lifting rope lifts the middle rail, and the second lifting rope hangs down on the back surface of the upper curtain cloth in a winding manner through the back surface of the middle rail.

10. A pleated curtain comprising an upper curtain fabric and a lower curtain fabric which are respectively liftable by a plurality of lifting cords, characterized in that,

a first lifting rope for lifting the upper curtain cloth is inserted in the through hole of the upper curtain cloth,

a second lifting rope for lifting the lower curtain cloth is inserted into a through hole formed in an engaging piece, instead of being inserted into a through hole of the upper curtain cloth, wherein the engaging piece is arranged at the rear end of each layer of the lower curtain cloth which is bent in a zigzag manner in the vertical direction;

the lower end of the upper curtain cloth is mounted on the upper surface of the middle rail, the upper end of the lower curtain cloth is mounted on the lower surface of the middle rail, the first lifting rope lifts the middle rail, and the second lifting rope hangs down on the back surface of the upper curtain cloth in a winding manner through the back surface of the middle rail.

11. A pleated curtain comprising an upper curtain fabric and a lower curtain fabric which are respectively liftable by a plurality of lifting cords, characterized in that,

a first lifting rope for lifting the upper curtain cloth is inserted in the through hole of the upper curtain cloth,

the second lifting cord for lifting the lower curtain cloth is not inserted into the through hole of the upper curtain cloth, but inserted into the through hole formed in each layer of the lower curtain cloth which is bent in a zigzag manner in the vertical direction,

the through holes of the layers of the lower cord fabric comprise through holes formed at positions deviated from the rear to the front from the uppermost layer to the lower layer;

the lower end of the upper curtain cloth is mounted on the upper surface of the middle rail, the upper end of the lower curtain cloth is mounted on the lower surface of the middle rail, the first lifting rope lifts the middle rail, and the second lifting rope hangs down on the back surface of the upper curtain cloth in a winding manner through the back surface of the middle rail.

12. A pleated curtain comprising an upper curtain fabric and a lower curtain fabric which are respectively liftable by a plurality of lifting cords, characterized in that,

a first lifting rope for lifting the upper curtain cloth is inserted in the through hole of the upper curtain cloth,

a second lifting cord for lifting the lower fabric is not inserted into the through hole of the upper fabric, but hangs down behind a predetermined layer of the lower fabric, and is inserted into the through hole provided below the predetermined layer, wherein the predetermined layer is a predetermined layer including an uppermost layer of the plurality of layers of the lower fabric which is bent in a zigzag manner in the vertical direction;

the lower end of the upper curtain cloth is mounted on the upper surface of the middle rail, the upper end of the lower curtain cloth is mounted on the lower surface of the middle rail, the first lifting rope lifts the middle rail, and the second lifting rope hangs down on the back surface of the upper curtain cloth in a winding manner through the back surface of the middle rail.

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