JP5518645B2 - Ladder cord for horizontal blind and method for manufacturing the same - Google Patents

Description

  The present invention relates to a ladder cord for changing the inclination angles of a plurality of slats extending in the horizontal direction of a horizontal blind suspended so as to cover a window and the like, and a method of manufacturing the ladder cord.

  Conventionally, a large number of slat plates are stacked between the top support member and the bottom plate, and a horizontal cord is stretched between the first and second vertical cords arranged at the front and rear thereof so as to keep each slat plate horizontal. A method for manufacturing a ladder code for a mounted blind is disclosed (for example, see Patent Document 1). In this ladder cord manufacturing method, first, a ladder cord in which a horizontal cord is stretched at a predetermined pitch between two first and second longitudinal cords arranged in parallel is continuously fed out. Next, a plurality of processing members arranged at predetermined intervals so that tooth-shaped protrusions having different left and right lengths protrude on the surface and a heating source for heating and fixing the ladder cords are accommodated. The ladder cord is carried into the heated furnace. Next, in this heating furnace, the ladder cord window formed by the horizontal string is heated and conveyed while closely fitting the toothed projection of the processing member, and the shape of the ladder cord window is the same shape as the toothed projection. To fix. Further, the ladder cord is peeled off from the above-mentioned tooth-shaped projections, taken out from the heating furnace, cooled and transported.

  In the ladder cord manufactured in this way, the ladder cords having different horizontal cord pitches with respect to the first and second vertical cords, that is, the coupling pitch of one end of each horizontal cord to the first vertical cord and the other end of each horizontal cord. Ladder cords composed of unequal pitch portions having different coupling pitches to the second vertical cord can be easily manufactured. In the blind using this ladder cord, the inclination angle of the uppermost slat is 0 degree, that is, horizontal, and the inclination angle of the slat gradually increases toward the lower side. As a result, sunlight from the outside of the window is reflected by the slats, and the upper slat plate is directed toward the ceiling behind the room, and the lower slat is directed toward the ceiling near the window. Daylighting is possible.

Japanese Patent No. 3558993 (Claim 1, paragraphs [0018] and [0020])

  However, in the blind ladder code manufacturing method disclosed in the above-mentioned conventional patent document 1, since only a ladder code consisting of unequal pitch portions is manufactured, a horizontal blind using the ladder code in a vertically long window. , The length of the ladder cord in the vertical direction becomes longer, and even if the upper slat is in a horizontal state, the lower slat is in a standing state, and there is a problem that proper lighting cannot be performed. .

  In order to eliminate this point, the present inventor has added a ladder cord composed of the unequal pitch portion to the first vertical cord at one end of each horizontal cord and the second vertical cord at the other end of each horizontal cord. The inventors have invented a ladder cord in which ladder cords composed of uniform pitch portions having the same coupling pitch to are connected. However, the dimensional accuracy of the coupling pitch of the first and second vertical cords at the connecting portion or the structural strength at the connecting portion is reduced simply by connecting the unequal pitch portion and the equal pitch portion. There was a risk.

  A first object of the present invention is to provide a horizontal blind ladder code that enables optimum daylighting by using a ladder code having an unequal pitch portion and a uniform pitch portion in a horizontal blind. The second object of the present invention is to use a vertical string that is seamless from the unequal pitch part to the equal pitch part, thereby ensuring uniform structural strength over the entire length of the vertical string and equal to the unequal pitch part. It is an object of the present invention to provide a horizontal blind ladder cord and a method of manufacturing the same that can prevent a reduction in dimensional accuracy of a coupling pitch in a switching portion of the pitch portion. The third object of the present invention is to connect the unequal pitch portion and the vertical string of the equal pitch portion, but the structural strength slightly decreases at the connection portion of the unequal pitch portion and the equal pitch portion. It is an object of the present invention to provide a horizontal blind ladder cord that can prevent a reduction in the dimensional accuracy of the joint pitch at the portion.

  As shown in FIGS. 1 and 2, the first aspect of the present invention is a distance from the head box 12 attached to the wall surface or ceiling in the direction in which the line of intersection between the plane perpendicular to the longitudinal direction of the head box 122 and the horizontal plane extends. The first vertical cords 14a and 16a and the second vertical cords 14b and 16b that are suspended from each other and stretched around the first vertical cords 14a and 16a and the second vertical cords 14b and 16b, respectively, to support the plurality of slats 13 In the horizontal blind ladder cord having a plurality of horizontal cords 14c, 16c, the coupling pitch of one end of each horizontal cord 14c to the first vertical cord 14a and the other vertical cord of each horizontal cord 14c to the second vertical cord 14b The unequal pitch portions 14 formed to have different coupling pitches, and the plurality of horizontal cords 16c are coupled to the first vertical cords 16a and the other vertical cords 16c are coupled to the second vertical cords 16b. The same pitch And having a uniform pitch portion 16 formed so that.

  The second aspect of the present invention is an invention based on the first aspect, and further, as shown in FIG. 1, the first vertical cords 14 a and 16 a and the second vertical cords 14 b and 16 b are separated from the unequal pitch portion 14. It is characterized in that it is formed by a single continuous string with no joints over the uniform pitch portion 16.

  The third aspect of the present invention is an invention based on the first aspect, and as shown in FIGS. 9 and 10, the end of the first vertical string 54 a of the unequal pitch portion 54 and the equal pitch portion 56. The end of the first vertical cord 56a is connected, and the end of the second vertical cord 54b of the equal pitch portion 56 and the end of the second vertical cord 54b of the unequal pitch portion 54 are connected. .

  A fourth aspect of the present invention is an invention based on the third aspect, and as shown in FIGS. 9 and 10, as shown in FIGS. 9 and 10, the end of the first vertical string 54 a of the unequal pitch portion 54 and the equal pitch portion. The ends of the 56 first vertical cords 56a are connected with the horizontal cord 56c closest to the end of the first vertical cord 56a of the uniform pitch portion 56 as a reference, and the ends of the second vertical cord 54b of the unequal pitch portion 54 The end of the second vertical string 56b of the uniform pitch portion 56 is connected with the horizontal string 56c closest to the end of the second vertical string 56b of the uniform pitch portion 56 as a reference.

  As shown in FIG. 1 and FIGS. 3 to 5, the fifth aspect of the present invention is that a plurality of horizontal lines are arranged at a predetermined pitch between the first vertical cords 14 a and 16 a and the second vertical cords 14 b and 16 b arranged in parallel. A step of feeding the ladder cord 11 made of thermoplastic resin or thermosetting resin formed by stretching the strings 14c, 16c and a predetermined interval so that the quadrangular tooth-shaped protrusions 21a, 22a protrude on the surface. A step of closely fitting and fitting the windows 14f and 16f of the ladder cord 11 to the tooth-shaped protrusions 21a and 22a of the processing members 21 and 22 arranged in a plurality of positions, and the shapes of the windows 14f and 16f. In the method of manufacturing the horizontal blind ladder cord including the steps of heating and cooling so as to have the same shape as the quadrangular shape of the mold protrusions 21a and 22a, the processed members 21 and 22 are shaped like the square shape of the tooth-shaped protrusion 21a. Left and right length There are different unequal pitch processing members 21 and uniform pitch processing members 22 in which the left and right lengths of the tooth-shaped projections 22a are the same, and using the unequal pitch processing members 21, ladder codes are used. 11 is formed so that the coupling pitch of one end of each horizontal cord 14c to the first vertical cord 14a is different from the coupling pitch of the other end of each horizontal cord 14c to the second vertical cord 14b. Using the step of fixing to the pitch portion 14, the step of replacing the uneven pitch processing member 21 with the uniform pitch processing member 22 after the fixing of the unequal pitch portion 14, and the uniform pitch processing member 22 are used. The remaining portion of the ladder cord 11 is formed such that the coupling pitch of one end of each horizontal cord 16c to the first vertical cord 16a and the coupling pitch of the other end of each horizontal cord 16c to the second vertical cord 16b are the same. Fixing to the uniform pitch portion 16 made It characterized the door.

  A sixth aspect of the present invention is that, as shown in FIGS. 1 and 4 to 6, a plurality of horizontal lines are arranged at a predetermined pitch between the first vertical cords 14 a and 16 a and the second vertical cords 14 b and 16 b arranged in parallel. A step of feeding the ladder cord 11 made of thermoplastic resin formed by stretching the strings 14c and 16c, and a plurality of square tooth-shaped projections 21a and 22a are arranged at predetermined intervals so as to protrude on the surface. A step of closely fitting the respective window portions 14f and 16f of the ladder cord 11 to the respective tooth-shaped protrusions 21a and 22a of the processed members 21 and 22, respectively, and the shapes of the window portions 14f and 16f of the tooth-shaped protrusions 21a and 22a. In the method of manufacturing a horizontal blind ladder cord including the steps of heating and cooling so as to have the same shape as the quadrangle, the processing members 21 and 22 are arranged so that the left and right lengths of the quadrilaterals of the tooth-shaped protrusions 21a are the same. Different unequal pitches The processing member 21 and the uniform pitch processing member 22 having the same left and right lengths of the quadrilaterals of the tooth-shaped protrusions 22a are used. It fixes to the unequal pitch part 14 formed so that the coupling pitch to the 1st vertical string 14a of one end of the horizontal string 14c and the coupling pitch to the 2nd vertical string 14b of the other end of each horizontal string 14c may differ. Using the process and the uniform pitch processing member 22, a part of the ladder cord 11, which is fixed to the unequal pitch portion 14, is connected to the first vertical string 16 a at one end of each horizontal string 16 c. And a step of re-fixing to the equal pitch portion 16 formed so that the coupling pitch of the other end of each horizontal cord 16c to the second vertical cord 16b becomes the same.

  As shown in FIGS. 1, 4, 5, and 7, the seventh aspect of the present invention provides a predetermined pitch between the first vertical cords 14a and 16a and the second vertical cords 14b and 16b arranged in parallel. A step of feeding a ladder cord 11 made of thermoplastic resin formed by stretching a plurality of horizontal cords 14c, 16c and a predetermined interval so that the quadrangular tooth-shaped projections 21a, 22a protrude on the surface. A step of closely fitting each of the window portions 14f and 16f of the ladder cord 11 to each of the tooth-shaped projections 21a and 22a of the plurality of processing members 21 and 22 arranged, and the shape of the window portions 14f and 16f are the tooth-shaped projections 21a. , 22a includes a step of heating and cooling so as to have the same shape as the quadrilateral of 22a, and fixing the lateral blind ladder cord. Inequalities And the uniform pitch processing member 22 having the same left and right lengths of the tooth-shaped projections 22a. The uniform pitch processing member 22 is used to wrap the entire ladder cord 11. The equal pitch portion 16 formed so that the coupling pitch of one end of each horizontal cord 16c to the first vertical cord 16a and the coupling pitch of the other end of each horizontal cord 16c to the second vertical cord 16b are the same. Using the step of fixing and the processing member 21 for unequal pitch, a part of the ladder cord 11 that is fixed to the uniform pitch portion 16 is connected to the first vertical cord 14a at one end of each horizontal cord 14c. And a step of re-fixing to the unequal pitch portion 14 formed so that the coupling pitch and the coupling pitch to the second vertical string 14b at the other end of each horizontal string 14c are different.

  In the horizontal blind ladder cord according to the first aspect of the present invention, the ladder cord has an unequal pitch portion and an equal pitch portion. Therefore, the horizontal blind using the ladder cord is attached to a window that is long in the vertical direction. However, the length of the unequal pitch portion in the vertical direction is shortened by the length of the uniform pitch portion in the vertical direction. As a result, when the upper slats of the unequal pitch part are in the horizontal state, the lower slats of the unequal pitch part do not stand up, so that the optimum daylighting is possible.

  In the horizontal blind ladder cord according to the second aspect of the present invention, the first and second vertical cords are formed by one continuous cord without any joint from the unequal pitch portion to the uniform pitch portion. Uniform structural strength can be ensured over the entire length. Further, it is possible to prevent the dimensional accuracy of the coupling pitch from being lowered at the switching portion between the unequal pitch portion and the uniform pitch portion.

  In the ladder cord for a horizontal blind according to the third aspect of the present invention, the end portion of the first vertical string of the unequal pitch portion and the end portion of the first vertical string of the equal pitch portion are connected to each other. Since the end of the vertical cord and the end of the second vertical cord of the equal pitch portion are connected, this ladder cord has an unequal pitch portion and an equal pitch portion. As a result, even if a horizontal blind using the ladder cord is attached to a window that is long in the vertical direction, the vertical length of the unequal pitch portion is shortened by the length of the upper term of the uniform pitch portion. When the upper slats of the equal pitch part are in a horizontal state, the lower slats of the unequal pitch part do not stand up, and optimal lighting is possible.

  In the ladder cord for a horizontal blind according to the fourth aspect of the present invention, the end of the first vertical string of the equal pitch portion and the end of the first vertical string of the equal pitch portion are connected to the end of the first vertical string of the unequal pitch portion. The end of the second vertical cord of the equal pitch portion is connected to the end of the second vertical cord of the equal pitch portion and the end of the second vertical cord of the equal pitch portion. As a result, since the structural strength is slightly reduced at the connecting portion between the unequal pitch portion and the equal pitch portion, it is possible to prevent a reduction in the dimensional accuracy of the coupling pitch at the connecting portion.

  In the horizontal blind ladder cord manufacturing method according to the fifth to seventh aspects of the present invention, a ladder cord can be manufactured which is seamlessly connected to the vertical cord from the unequal pitch portion to the uniform pitch portion. Structural strength can be secured. In addition, the unequal pitch portion is heated and cooled and fixed using the unequal pitch processing member, and the uniform pitch portion is heated and cooled and fixed using the unequal pitch processing member. The dimensional accuracy of the coupling pitch does not deteriorate at the switching portion of the uniform pitch portion.

It is a front view of the ladder cord for horizontal blinds of a 1st embodiment of the present invention. (A) is a side view showing a state where lighting is performed between each slat of a horizontal blind using the ladder cord, and (b) is a block diagram illustrating that lighting is performed between slats of the horizontal blind using the ladder cord. It is a side view which shows the state. It is a flowchart which shows the 1st manufacturing method of the ladder code. It is a side view of the processing roller for unequal pitch used for preparation of the unequal pitch part of the ladder code. It is a side view of the processing roller for uniform pitch used for preparation of the uniform pitch part of the ladder code. It is a flowchart which shows the 2nd manufacturing method of the ladder code. It is a flowchart which shows the 3rd manufacturing method of the ladder code. It is a perspective view of a horizontal blind using the ladder cord. It is process drawing which shows the manufacture procedure of the ladder code for horizontal blinds of 2nd Embodiment of this invention. FIG. 10 is an enlarged perspective view of a portion A in FIG. 9 showing a finishing process after connecting the unequal pitch portion and the equal pitch portion of the ladder cord.

Next, an embodiment for carrying out the present invention will be described with reference to the drawings.
<First Embodiment>
As shown in FIG. 8, the ladder cord 11 of the present invention is used for the horizontal blind 10. The horizontal blind 10 has a head box 12 that is attached to a wall surface or ceiling above an opening such as a window of a building via a mounting bracket. The ladder cord 11 supporting a plurality of slats 13 extending in the horizontal direction is suspended from the head box 12. As shown in FIG. 2A, the ladder cord 11 is suspended from the head box 12 at intervals in the direction in which the line of intersection between the plane perpendicular to the longitudinal direction of the head box 12 and the horizontal plane extends. It has vertical cords 14a, 16a and second vertical cords 14b, 16b, and horizontal cords 14c, 16c stretched around the first vertical cords 14a, 16a and the second vertical cords 14b, 16b. The first vertical cords 14a and 16a are suspended from the head box 12 along the inner edge of the slat 13, and the second vertical cords 14b and 16b are suspended from the head box 12 to the outer edge (window side) of the slat 13. The Further, a plurality of horizontal cords 14c and 16c are provided at predetermined intervals in the vertical direction, and the ladder cord 11 is formed in a ladder shape as a whole by these horizontal cords 14c and 16c. The plurality of slats 13 are respectively placed on the plurality of horizontal cords 14 c and 16 c in the ladder-like ladder cord 11, and the plurality of slats 13 are supported by the ladder cord 11 at intervals in the vertical direction. Further, the bottom plate 17 is horizontally attached to the lower ends of the first vertical cords 14 a and 16 a and the second vertical cords 14 b and 16 b constituting the ladder cord 11 so as to be parallel to the slats 13.

  On the other hand, as shown in FIGS. 1 and 2, the ladder cord 11 is connected to the first vertical cord 14a at one end of each horizontal cord 14c and to the second vertical cord 16a at the other end of each horizontal cord 14c. The unequal pitch portion 14 formed to have a different pitch, and the plurality of horizontal cords 16c are coupled to the first vertical cord 16a and the coupling pitch to the second vertical cord 16b at the other end of each horizontal cord 16c. And the equal pitch portion 16 formed so as to be the same. The first vertical cords 14a and 16a and the second vertical cords 14b and 16b are respectively formed by a single continuous string from the unequal pitch portion 14 to the uniform pitch portion 16 without a joint. In the present embodiment, the upper 10 stages of the 20 ladder ladder cords 11 are the uniform pitch portions 16, and the lower 10 stages are the unequal pitch portions 14. In the horizontal blind 10 using the ladder cord 11, as shown in FIG. 2 (a), the slat 13 placed on the horizontal cord 16c of the uniform pitch portion 16 is directed in the front-rear direction (from the indoor side to the outdoor side (window side). If the slats 13 placed on the horizontal cords 14c of the unequal pitch portion 14 are level, the inclination angle in the front-rear direction is gradually increased from the upper end of the unequal pitch portion 14 toward the lower side. That is, the upper surface of the slat 13 placed on the horizontal string 14 c of the unequal pitch portion 14 is configured to gradually face the outdoor side (window side) as it goes downward from the upper end of the unequal pitch portion 14.

  In this embodiment, the equal pitch portion is provided on the upper side and the unequal pitch portion is provided on the lower side. However, the unequal pitch portion may be provided on the upper side and the equal pitch portion may be provided on the lower side. In this embodiment, the number of ladder code stages is 20. However, the ladder code stage number may be 19 or less or 21 or more. Further, in this embodiment, the number of steps of the uniform pitch portion and the number of steps of the unequal pitch portion are the same as 10 steps, but the number of steps of the unequal pitch portion (height) and the number of steps of the uniform pitch portion (height). Is appropriately set according to the overall height of the ladder cord, the interval between the slats, the width in the front-rear direction of the slats, and the like.

  The ladder cord 11 is made of a thermoplastic synthetic fiber (thermoplastic resin) such as polyamide, polyester, acrylic or polyolefin, or a thermosetting synthetic fiber (thermosetting resin) such as polyurethane, polyimide or phenol resin. Is done. When the ladder cord is made of thermoplastic synthetic fiber, the ladder cord is heated and cooled to be cured, but it is softened when heated again. However, when the ladder cord is made of thermosetting synthetic fiber, the ladder cord is When heated and cooled to cure, it does not soften even when heated again. As shown in detail in the upper enlarged view of FIG. 1, the first vertical cord 14a and the second vertical cord 14b of the unequal pitch portion 14 are front and rear widths (widths in the direction from the indoor side of the horizontal blind 10 toward the outdoor side (window side)). ) And the horizontal string 14c of the unequal pitch portion 14 is composed of two first and second floating yarns. 14d and 14e. When the first floating yarn 14d of the horizontal cord 14c extends from the first vertical cord 14a to the second vertical cord 14b, the first floating yarn 14d exits from the front surface of the first vertical cord 14a and enters the rear surface of the second vertical cord 14b. When the second float 14e of 14c extends from the second vertical string 14b to the first vertical string 14a, it is configured to exit from the rear surface of the second vertical string 14b and enter the front surface of the first vertical string 14a. Further, the uniform pitch portion 16 is configured in the same manner as the unequal pitch portion 14. Specifically, as shown in detail in the lower enlarged view of FIG. 1, the first vertical cord 16a and the second vertical cord 16b of the uniform pitch portion 16 are respectively formed by flat knitted cords having a narrow left-right width compared to the front-rear width. The horizontal string 16c of the equal pitch portion 16 is configured by two first and second floating yarns 16d and 16e. When the first floating thread 16d of the horizontal string 16c extends from the first vertical string 16a to the second vertical string 16b, the first floating thread 16d extends from the front surface of the first vertical string 16a and enters the rear surface of the second vertical string 16b. When the second floating string 16e of 16c extends from the second vertical string 16b to the first vertical string 16a, the second floating string 16e exits from the rear surface of the second vertical string 16b and enters the front surface of the first vertical string 16a.

  On the other hand, a mechanism (not shown) for moving up and down the first vertical cords 14a and 16a or the second vertical cords 14b and 16b in the ladder cord 11 is built in the head box 12, and FIGS. As shown in b), the window portion 16f defined by the first vertical cord 16a and the second vertical cord 16b of the uniform pitch portion 16 and the two horizontal cords 16c and 16c adjacent to each other in the vertical direction is changed from a square to a parallelogram. The window portion 14f, which is configured to be deformable, and is partitioned by the first vertical cord 14a and the second vertical cord 14b of the unequal pitch portion 14 and the two horizontal cords 14c and 14c that are close to each other in the vertical direction, is a substantially parallelogram. It is configured to be deformable into a flat, substantially parallelogram. The head box 12 is provided with one end of a tilt operation rod 18 (FIG. 8) for operating the vertical movement mechanism of the first vertical cords 14a, 16a or the second vertical cords 14b, 16b. When the tilting operation rod 18 is rotated about its center axis, either the first vertical cord 14a, 16a or the second vertical cord 14b, 16b in the ladder cord 11 is moved by a vertical movement mechanism provided in the head box 12. Either one or both of them move up and down, and the first vertical cord 14a and the second vertical cord 14b of the unequal pitch portion 14 and the window portion 14f defined by the two horizontal cords 14c and 14c adjacent in the vertical direction are parallel from a square shape. The first vertical string 16a and the second vertical string 16b of the uniform pitch portion 16 are deformed into a quadrangular shape, and the window portion 16f defined by the two horizontal strings 16c and 16c adjacent to each other in the vertical direction is flattened from a substantially parallelogram. The plurality of slats 13 deformed into parallelograms and supported by the horizontal cords 14c and 16c are configured to tilt simultaneously in the same direction. 2 (a) and 2 (b), reference numeral 19 denotes a lifting / lowering cord that is suspended from the head box 12 and has a lower end connected to the bottom plate 17. By operating the lifting / lowering cord 19, the slat 13 moves up and down. Configured.

  In the ladder cord 11 for the horizontal blind 10 configured as described above, the ladder cord 11 has the unequal pitch portion 14 and the equal pitch portion 16, so that the horizontal blind 10 using the ladder cord 11 is moved vertically. Even when attached to a long window, the length of the unequal pitch portion 14 in the vertical direction is shortened by the length of the uniform pitch portion 16 in the vertical direction. As a result, when the upper slats 13 of the unequal pitch portions 14 are in a horizontal state, the lower slats 13 of the unequal pitch portions 14 do not stand up, so that optimal lighting is possible. Specifically, as indicated by the dashed arrows in FIG. 2 (a), the direct sunlight entering the room obliquely from above is reflected by the slats 13 of the upper equal pitch portion 16 to illuminate the indoor ceiling, and FIG. As indicated by the one-dot chain line arrow (a), the wall surface reflected light that enters the room horizontally passes between the slats 13 of the upper equal pitch portion 16 and enters the room as it is, and the lower unequal pitch. Reflected by the slats 13 of the section 14 to illuminate the ceiling of the room. As a result, the person in the room is not irradiated with direct sunlight, and the light is irradiated only on the upper part of the room including the ceiling, so that the room can be kept bright without feeling dazzling. As a result, the number of fluorescent lamps in the room can be reduced, and power can be saved. In addition, since the first vertical cords 14a and 16a and the second vertical cords 14b and 16b are formed by a single continuous string from the unequal pitch portion 14 to the uniform pitch portion 16, the first vertical cord 14a, Uniform structural strength can be ensured over the entire length of 16a and the second vertical cords 14b, 16b. Further, since the unequal pitch portion 14 and the uniform pitch portion 16 are not connected, it is possible to prevent the dimensional accuracy of the coupling pitch from being lowered in the switching portion between the unequal pitch portion 14 and the uniform pitch portion 16.

A first manufacturing method of the ladder cord 11 for the horizontal blind 10 configured as described above will be described with reference to the flowchart of FIG. First, a ladder-like ladder cord 11 having a predetermined length L is prepared. The ladder cord 11 is formed of a thermoplastic synthetic fiber (thermoplastic resin) or a thermosetting synthetic fiber (thermosetting resin), and is before being heated and cured. First, the ladder cord 11 is unwound and wound around the uneven pitch processing roller 21. As shown in FIG. 4, the uneven pitch processing rollers 21 are arranged in a plurality at a predetermined interval so that square tooth-shaped protrusions 21 a protrude from the outer peripheral surface, and the tooth-shaped protrusions 21 a The rectangular left and right lengths, that is, the left and right diameters (D ₁ , D ₂ ) of the unequal pitch processing rollers 21 are different (for example, D ₁ > D ₂ ). Only half of the overall length L of the ladder cord 11 (L / 2) is unequal so that the respective window portions 14f and 16f of the ladder cord 11 are in close contact with the respective tooth-shaped protrusions 21a of the uneven pitch processing roller 21. It is wound around the processing roller 21 for pitch. When heated in this state and then cooled, only half (L / 2) of the overall length L of the ladder cord 11 is fixed to the unequal pitch portion 14. Next, the uneven pitch processing roller 21 is replaced with a uniform pitch processing roller 22. As shown in FIG. 5, a plurality of uniform pitch processing rollers 22 are arranged at predetermined intervals on the outer peripheral surface so that square tooth projections 22a protrude from the surface, and the square of the tooth projections 22a. The left and right lengths, that is, the left and right diameters (d ₁ , d ₂ ) of the uniform pitch processing roller 22 are formed to be the same (for example, d ₁ = d ₂ ). The other half (L / 2) of the ladder cord 11 is processed for equal pitch so that the window portions 14f and 16f of the ladder cord 11 are in close contact with the tooth-shaped projections 22a of the uniform pitch processing roller 22, respectively. It is wound around the roller 22. When heated in this state and then cooled, the remaining half (L / 2) of the ladder cord 11 is fixed to the uniform pitch portion 16.

  A second method for manufacturing the ladder cord 11 for the horizontal blind 10 will be described with reference to the flowchart of FIG. First, a ladder-like ladder cord 11 having a predetermined length L is prepared. The ladder cord 11 is formed of a thermoplastic synthetic fiber (thermoplastic resin) and is not heated and cured. First, the ladder cord 11 is unwound and wound around the uneven pitch processing roller 21. The ladder cord 11 is wound around the unequal pitch processing roller 21 over the entire length L so that the window portions 14f and 16f of the ladder cord 11 are in close contact with the tooth-shaped protrusions 21a of the unequal pitch processing roller 21, respectively. . When heated in this state and then cooled, the entire length L of the ladder cord 11 is fixed to the unequal pitch portion 14. Next, after removing the ladder cord 11 whose overall length is fixed to the unequal pitch portion 14 from the processing roller 21 for unequal pitch, only half (L / 2) of the overall length L of the ladder cord 11 is heated and softened. The softened portion is wound around the processing roller 22 for uniform pitch. When cooled in this state, half (L / 2) of the ladder cord 11 is re-fixed to the uniform pitch portion 16.

  A third method for manufacturing the ladder cord 11 for the horizontal blind 10 will be described with reference to the flowchart of FIG. First, a ladder-like ladder cord 11 having a predetermined length L is prepared. The ladder cord 11 is formed of a thermoplastic synthetic fiber (thermoplastic resin) and is not heated and cured. First, the ladder cord 11 is fed out and wound around the processing roller 22 for uniform pitch. It winds around the processing roller 22 for equal pitches over the full length L of the ladder cord 11 so that each window part 14f, 16f of the ladder cord 11 closely_contact | adheres to each tooth type protrusion 22a of this processing roller 22 for uniform pitch, respectively. When heated in this state and then cooled, the entire length L of the ladder cord 11 is fixed to the uniform pitch portion 16. Next, after removing the ladder cord 11 whose overall length is fixed to the uniform pitch portion 16 from the processing roller 22 for uniform pitch, only half (L / 2) of the overall length L of the ladder cord 11 is heated and softened. This part is wound around the processing roller 21 for uneven pitch. When cooled in this state, half (L / 2) of the ladder cord 11 is re-fixed to the unequal pitch portion 14.

  In the ladder cord 11 for the horizontal blind 10 manufactured in this way, the ladder cord 11 without a joint is connected to the first vertical cords 14a and 16a and the second vertical cords 14b and 16b from the unequal pitch portion 14 to the uniform pitch portion 16. Since it can be manufactured, uniform structural strength can be ensured over the entire length of the first vertical cords 14a, 16a and the second vertical cords 14b, 16b. In addition, the unequal pitch portion 14 is heated and cooled by using the unequal pitch processing roller 21 and fixed, and the uniform pitch portion 16 is heated and cooled and fixed by using the equal pitch processing roller 22. In the switching portion between the equal pitch portion 14 and the uniform pitch portion 16, the dimensional accuracy of the coupling pitch does not decrease.

  In the first to third methods for manufacturing the horizontal blind ladder cord, the uneven pitch processing roller and the uniform pitch processing roller having a plurality of tooth-shaped protrusions on the outer peripheral surface are used. Non-uniform pitch processing belts and uniform pitch processing belts having a plurality of tooth-shaped protrusions may be used.

<Second Embodiment>
9 and 10 show a second embodiment of the present invention. In this embodiment, the upper end of the first vertical string 54a of the unequal pitch portion 54a and the lower end of the first vertical string 56a of the equal pitch portion 56 are connected by the caulking tool 57, and the second vertical string of the unequal pitch portion 54 is connected. The upper end of 54 b and the lower end of the second vertical string 56 b of the equal pitch portion 56 are connected by a caulking tool 57. At this time, the upper end of the first vertical cord 54a of the unequal pitch portion 54 and the lower end of the first vertical cord 56a of the equal pitch portion 56 are closest to the lower end of the first vertical cord 56a of the equal pitch portion 56 as a reference. Reference is made to a horizontal cord 56c that is connected and the lower end of the second vertical cord 56b of the equal pitch portion 56 is the closest to the lower end of the second vertical cord 56b of the equal pitch portion 56. Concatenated as The configuration other than the above is the same as that of the first embodiment.

  A method for manufacturing the horizontal blind ladder cord 51 thus configured will be described. First, the unequal pitch portion 54 of the ladder cord 51 is produced using the unequal pitch processing roller 21 (FIG. 4), and the equal pitch portion 56 of the ladder cord 51 is formed using the equal pitch processing roller 22 (FIG. 5). It is produced (FIG. 9A). Next, the first and second vertical cords 56a and 56b of the uniform pitch portion 56 are cut together with the horizontal cord 56c at the position of the lowermost horizontal cord 56c, and the first and second vertical cords 54a and 54b of the unequal pitch portion 54 are cut. Is cut together with the horizontal string 54c at the position of the uppermost horizontal string 54c (FIG. 9B). Next, the upper end of the first vertical cord 54a of the unequal pitch portion 54 is aligned with the lowermost horizontal cord 56c of the uniform pitch portion 56 (FIG. 9C), and the first vertical cord 54 of the unequal pitch portion 54 is aligned. The string 54a and the first vertical string 56a of the equal pitch portion 56 are connected by caulking with a caulking tool 57 (FIG. 9 (d) and FIG. 10 (a)). Further, the second vertical cord of the unequal pitch portion 54 is made in a state where the upper end of the second vertical cord 54b of the unequal pitch portion 54 is made to coincide with the lowermost horizontal cord 56c of the uniform pitch portion 56 (FIG. 9C). 54b and the second vertical string 56b of the equal pitch portion 56 are connected by caulking with a caulking tool 57 (FIG. 9 (d) and FIG. 10 (a)). Furthermore, by connecting the first vertical cord 54a of the unequal pitch portion 54 and the first vertical cord 56a of the equal pitch portion 56 using the caulking tool 57, the excess portions 54d and 56d that have jumped out of the caulking tool 57 are cut off. (FIG. 10 (b)), a portion that protrudes from the caulking tool 57 and remains due to the connection using the caulking tool 57 between the second vertical string 54 b of the unequal pitch portion 54 and the second vertical string 56 b of the equal pitch portion 56. 54e and 56e are excised (FIG. 10B).

  In the thus-produced horizontal blind ladder cord 51, the upper end of the first vertical cord 54a of the unequal pitch portion 54 and the lower end of the first vertical cord 56a of the uniform pitch portion 56 are connected to the first vertical cord 56 of the uniform pitch portion 56. The horizontal cord 56c closest to the lower end of the cord 56a is connected as a reference, and the upper end of the second vertical cord 54b of the unequal pitch portion 54 and the lower end of the second vertical cord 56b of the uniform pitch portion 56 are connected to the first pitch of the uniform pitch portion 56. 2 Since the horizontal string 56c closest to the lower end of the vertical string 56b is connected as a reference, the structural strength slightly decreases at the connecting part between the unequal pitch part 54 and the uniform pitch part 56. It is possible to prevent the dimensional accuracy from being lowered.

DESCRIPTION OF SYMBOLS 10 Horizontal type blind 11, 51 Ladder code 12 Head box 13 Slat 14, 54 Unequal pitch part 14a, 54a 1st vertical string 14b, 54b 2nd vertical string 14c, 54c Horizontal string 14f Window part 16, 56 Uniform pitch part 16a, 56a First vertical string 16b, 56b Second vertical string 16c, 56c Horizontal string 16f Window 21 Unequal pitch processing roller (unequal pitch processing member)
21a Tooth type protrusion 22 Processing roller for uniform pitch (Processing member for uniform pitch)
22a Tooth-shaped protrusion

Claims (7)

A first vertical string (14a, 14a, 14b) suspended from a head box (12) attached to a wall surface or a ceiling with an interval extending in a direction in which a line perpendicular to the longitudinal direction of the head box (12) and a horizontal plane extend. 16a) and second vertical cords (14b, 16b) and a plurality of slats (13) supported by the first vertical cords (14a, 16a) and the second vertical cords (14b, 16b), respectively. In the horizontal blind ladder cord having the horizontal string (14c, 16c),
The coupling pitch of one end of each horizontal string (14c) to the first vertical string (14a) and the coupling pitch of the other end of each horizontal string (14c) to the second vertical string (14b) are different. An unequal pitch portion (14) formed in
The plurality of horizontal strings (16c) have the same coupling pitch to the first vertical string (16a) and the coupling pitch to the second vertical string (16b) at the other end of each horizontal string (16c). A horizontal blind ladder cord comprising: a uniform pitch portion (16) formed as described above.   The first vertical string (14a, 16a) and the second vertical string (14b, 16b) are connected by a single continuous string from the unequal pitch portion (14) to the uniform pitch portion (16). The ladder cord for a horizontal blind according to claim 1, wherein the ladder cord is formed respectively.   An end portion of the first vertical string (54a) of the unequal pitch portion (54) and an end portion of the first vertical string (56a) of the uniform pitch portion (56) are connected, and the unequal pitch portion (54). The horizontal blind ladder cord according to claim 1, wherein an end of the second vertical cord (54b) and an end of the second vertical cord (56b) of the uniform pitch portion (56) are connected.   The end of the first vertical string (54a) of the unequal pitch part (54) and the end of the first vertical string (56a) of the uniform pitch part (56) are the first vertical part of the uniform pitch part (56). The horizontal string (56c) closest to the end of the string (56a) is connected as a reference, and the end of the second vertical string (54b) of the unequal pitch part (54) and the first of the equal pitch part (56) The end of two vertical cords (56b) is connected with the horizontal cord (56c) closest to the end of the second vertical cord (56b) of the uniform pitch portion (56) as a reference. Ladder code. Made of thermoplastic resin formed by stretching a plurality of horizontal strings (14c, 16c) at a predetermined pitch between the first vertical string (14a, 16a) and the second vertical string (14b, 16b) arranged in parallel Alternatively, a process of feeding a ladder cord (11) made of a thermosetting resin, and a plurality of processing members (21, 22) arranged at predetermined intervals so that square tooth-shaped protrusions (21a, 22a) protrude on the surface. 22) the step of closely fitting the respective window portions (14f, 16f) of the ladder cord (11) to the respective tooth-shaped projections (21a, 22a), and the shape of the window portions (14f, 16f) In the method of manufacturing a horizontal blind ladder cord, including a step of heating and cooling so as to have the same shape as the quadrangular shape of the tooth-shaped protrusions (21a, 22a), and fixing.
The processed members (21, 22) are a non-uniform pitch processed member (21) in which the left and right lengths of the squares of the tooth-shaped protrusions (21a) are different from each other, and And a uniform pitch processing member (22) having the same length,
Using the uneven pitch processing member (21), a part of the ladder cord (11) is connected to the first vertical string (14a) at one end of each horizontal string (14c) and the respective Fixing the other end of the horizontal cord (14c) to the unequal pitch portion (14) formed to have a different coupling pitch to the second vertical cord (14b);
Replacing the uneven pitch processing member (21) with the uniform pitch processing member (22) after completion of fixing of the uneven pitch portion (14);
Using the processing member (22) for uniform pitch, the remaining portion of the ladder cord (11) is connected to the first vertical cord (16a) at one end of each horizontal cord (16c) and each horizontal cord. And a step of fixing the other end of (16c) to the equal pitch portion (16) formed so that the coupling pitch to the second vertical string (16b) is the same. Method of manufacturing ladder code. Made of thermoplastic resin formed by stretching a plurality of horizontal strings (14c, 16c) at a predetermined pitch between the first vertical string (14a, 16a) and the second vertical string (14b, 16b) arranged in parallel The ladder cord (11), and the teeth of the processing members (21, 22) arranged in a plurality at predetermined intervals so that the quadrangular tooth-shaped protrusions (21a, 22a) protrude on the surface. A step of closely fitting each window portion (14f, 16f) of the ladder cord (11) to the mold protrusion (21a, 22a), and a shape of the window portion (14f, 16f), the tooth shape protrusion (21a, In the method of manufacturing a ladder cord for a horizontal blind, including a step of heating and cooling so as to have the same shape as the quadrangle of 22a)
The processed members (21, 22) are a non-uniform pitch processed member (21) in which the left and right lengths of the squares of the tooth-shaped protrusions (21a) are different from each other, and And a uniform pitch processing member (22) having the same length,
Using the unequal pitch processing member (21), the entire ladder cord (11) is connected to the first vertical string (14a) at one end of each horizontal string (14c) and the horizontal pitch. Fixing the other end of the string (14c) to the unequal pitch portion (14) formed so that the coupling pitch to the second vertical string (14b) is different;
Using the uniform pitch processing member (22), a part of the ladder cord (11), which is fixed to the unequal pitch portion (14), is attached to the end of each horizontal cord (16c). A uniform pitch portion (16) formed such that the coupling pitch to the first vertical string (16a) and the coupling pitch to the second vertical string (16b) at the other end of each horizontal string (16c) are the same. And a step of re-fixing to a horizontal blind ladder cord. Made of thermoplastic resin formed by stretching a plurality of horizontal strings (14c, 16c) at a predetermined pitch between the first vertical string (14a, 16a) and the second vertical string (14b, 16b) arranged in parallel The ladder cord (11), and the teeth of the processing members (21, 22) arranged in a plurality at predetermined intervals so that the quadrangular tooth-shaped protrusions (21a, 22a) protrude on the surface. A step of closely fitting each window portion (14f, 16f) of the ladder cord (11) to the mold protrusion (21a, 22a), and a shape of the window portion (14f, 16f), the tooth shape protrusion (21a, In the method of manufacturing a ladder cord for a horizontal blind, including a step of heating and cooling to be the same shape as the quadrangle of 22a), and fixing it,
The processed members (21, 22) are a non-uniform pitch processed member (21) in which the left and right lengths of the squares of the tooth-shaped protrusions (21a) are different from each other, and And a uniform pitch processing member (22) having the same length,
Using the uniform pitch processing member (22), the entire ladder cord (11) is connected to the first vertical cord (16a) at one end of the horizontal cord (16c) and the horizontal cord. Fixing to the equal pitch portion (16) formed so that the coupling pitch of the other end of (16c) to the second vertical string (16b) is the same;
Using the uneven pitch processing member (21), a part of the ladder cord (11), which is fixed to the uniform pitch portion (16) as a whole, the one end of each horizontal cord (14c) An unequal pitch portion (14) formed such that the coupling pitch to the first vertical cord (14a) and the coupling pitch to the second vertical cord (14b) at the other end of each horizontal cord (14c) are different. A method for manufacturing a horizontal blind ladder cord, comprising the step of:

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