Curtain unit repairing method

Abstract

To provide a curtain unit repairing method capable of easily repairing a curtain unit in which a core material of a bead part is broken.SOLUTION: A curtain unit repairing method including the steps of: removing an engaging element that is arranged around a damaged portion of a core material; placing a repair member having a mesh body along a bead portion so as to cover the damaged portion and to cover the surface of the bead portion around the damaged portion; attaching the engaging element to the bead portion from which the engaging element was removed; and screwing a screw member through the through hole of the engaging element and into the bead portion from which the repair member is arranged, thereby fixing the engaging element to the bead portion.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present disclosure relates to a method for repairing a curtain unit. [Background technology]

[0002] 2. Description of the Related Art There is a sheet shutter that includes a curtain unit suspended from a rotating shaft so as to be freely wound and unwound (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2016-089419 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a sheet shutter, a plurality of engaging pieces, also called resin guide blocks, which engage with a guide rail extending in the vertical direction, are provided on the bead portions provided on both ends of the curtain unit. The curtain unit is supported so as to move up and down along the guide rail by the engaging pieces being guided by the guide rail. The curtain unit can be moved up and down by engaging the engaging pieces with a gear member and rotating the gear member.

[0005] When a curtain unit is damaged, the core material embedded in the bead portion may break, and it is difficult to repair a curtain unit in which the core material in the bead portion has broken.

[0006] In consideration of the above, the present disclosure aims to provide a curtain unit repair method that can easily repair a curtain unit whose core material in the bead portion has broken. [Means for solving the problem]

[0007] A method for repairing a curtain unit according to a first aspect includes a sheet curtain that is wound or unwound on a winding roll and has a bead portion formed by accommodating a core material inside a folded-back portion formed by folding back an end portion in the width direction, a clamping portion that clamps the folded-back portion from both sides, a bead accommodating portion that communicates with the clamping portion and accommodates the bead portion, and a through hole that is formed on the opposite side of the clamping portion with respect to the bead accommodating portion and reaches the bead portion, the curtain curtain having a plurality of engaging members that engage with a rotatable gear member and are guided by a contact block provided radially outward of the gear member, and a screw member that is screwed into the bead portion from the through hole of the engaging member to fix the engaging member to the bead portion. a sheet curtain unit having a curtain unit with a damaged portion, the curtain unit being guided by left and right guide rails erected at both widthwise ends of an opening in a building, the curtain unit being capable of opening and closing the opening, the curtain unit having a sheet curtain and including: a removal step of removing the curtain unit adjacent to a damaged portion of the core material; a placement step of placing a repair member including a mesh body along the bead portion so as to cover the damaged portion; an attachment step of attaching the curtain unit to the bead portion from which the curtain unit was removed; and a fixing step of screwing the screw member into the bead portion from which the repair member was arranged by passing the repair member through the through hole of the curtain unit, thereby fixing the curtain unit to the bead portion.

[0008] In the curtain unit repair method according to the first aspect, in the removal step, an engagement element disposed around the damaged portion of the core material is removed.

[0009] In the placement process, a repair member including a mesh body is placed along the core material so as to cover the damaged portion and to cover the surface of the bead portion around the damaged portion (in other words, both longitudinal sides of the bead portion centered on the damaged portion).

[0010] In the mounting step, an engaging element is mounted to the bead portion from which the engaging element was removed. In the fixing step, a screw member is passed through the repair member from the through hole of the engaging element and screwed into the bead portion on which the repair member is disposed, thereby fixing the engaging element to the bead portion.

[0011] As a result, the repair member covering the damaged portion and the surface of the bead portion surrounding the damaged portion is sandwiched between the bead portion and the engaging element and is fixed to the bead portion with the screw member penetrating through it, allowing the bead portion where the core material has broken to be repaired with the repair member.

[0012] A curtain unit repair method according to a second aspect is the curtain unit repair method according to the first aspect, wherein the mesh body is a metal mesh.

[0013] In the curtain unit repair method according to the second aspect, by using a metal mesh for the mesh body, a higher reinforcing effect can be obtained compared to when the mesh material is a non-metallic material such as synthetic resin.

[0014] A curtain unit repair method according to a third aspect is the curtain unit repair method according to the first or second aspect, wherein the core material is formed of synthetic resin.

[0015] By using a synthetic resin for the core material, the curtain unit can be made lighter than when the core material is made of metal.

[0016] A fourth aspect of the present invention relates to a method for repairing a curtain unit, which is the same as the first aspect of the present invention, in which the sheet curtain is a sheet made of a mesh made of synthetic fibers covered with synthetic resin, and the repair member is made of a sheet made of the same material as the sheet curtain, and in the positioning process, the sheet and the repair member are bonded together.

[0017] In the curtain unit repair method of the fourth aspect, a repair member made of a sheet of the same material as the sheet curtain is adhered to the sheet curtain in the placement process, thereby achieving a greater reinforcing effect than if no adhesion was used. In addition, since the repair parts used in the repair are sheets made of the same material as the sheet curtain, management of the parts involved in the repair is easier than when a sheet made of a different material than the sheet curtain is used. Effect of the Invention

[0018] As described above, according to the curtain unit repair method disclosed herein, a curtain unit in which the core material of the bead portion has broken can be easily repaired. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view showing a sheet shutter according to a first embodiment of the present disclosure. [Diagram 2] 1 is a perspective view showing a main part of a sheet shutter according to a first embodiment of the present disclosure. [Diagram 3] 1 is a cross-sectional view showing a side frame portion of a sheet shutter according to an embodiment of the present disclosure, viewed from above. [Figure 4] 1 is a perspective view showing a curtain unit provided in a sheet shutter according to a first embodiment of the present disclosure. FIG. [Diagram 5] 1A and 1B are perspective views showing an engaging element provided on a sheet shutter according to a first embodiment of the present disclosure, 1C is a side view showing the engaging element, and 1D is a front view showing the engaging element. [Figure 6] 1 is a cross-sectional view seen from the side showing a main part of a sheet shutter according to a first embodiment of the present disclosure. [Figure 7] 5(A) to 5(C) are cross-sectional views showing a procedure for attaching an engaging element to a sheet curtain. [Figure 8] FIG. 13 is a perspective view showing a damaged sheet curtain. [Figure 9] FIG. 13 is a perspective view showing a sheet curtain with flat-knit mesh copper wire placed at the damaged area. [Figure 10] 13 is a cross-sectional view showing an engaging element fixing a bead portion repaired with flat-woven mesh copper wire. FIG. [Figure 11] FIG. 11 is a cross-sectional view showing an engaging element to which a bead portion repaired with a sheet made of the same material as the sheet curtain according to the second embodiment is fixed. [Figure 12]FIG. 11 is a cross-sectional view showing an engaging element to which a bead portion repaired with a flat knit mesh copper wire according to a third embodiment is fixed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] [First embodiment] A sheet shutter 10 according to a first embodiment of the present disclosure will be described with reference to Fig. 1 to Fig. 10. Note that, in the drawings, an arrow H indicates the up-down direction (vertical direction) of the sheet shutter 10, an arrow W indicates the width direction (horizontal direction) of the sheet shutter 10, and an arrow L indicates the depth direction of the sheet shutter 10 (the horizontal direction intersecting with the arrow W).

[0021] [Overall structure] The sheet shutter 10 is a sheet shutter that is attached to an opening 11, which is the loading entrance of a building such as a warehouse, and as shown in Figures 1 and 2, it comprises a frame 12, a winding roll 20, a curtain unit 30, a driving roll 60, and a contact block 80. The frame 12, the winding roll 20, the curtain unit 30, the driving roll 60, and the contact block 80 are symmetrical with respect to a center line CL11 of the sheet shutter 10 in the width direction of the sheet shutter 10 (hereinafter referred to as the "shutter width direction").

[0022] [Frame] The frame 12 includes a pair of side frames 22 and a shutter case 18. The pair of side frames 22 each extend in the vertical direction of the sheet shutter 10 (hereinafter, the "shutter vertical direction") and are disposed on both sides of the carry-in entrance in the shutter width direction, at both ends of the curtain unit 30 in the shutter width direction.

[0023] Furthermore, guide rails 14 extending in the up-down direction are disposed inside each of the pair of side frames 22. The pair of guide rails 14 guide the curtain unit 30 in the up-down direction so that the curtain unit 30 moves in the up-down direction.

[0024] Specifically, a cross section of the side frame 22 cut in a direction perpendicular to the longitudinal direction has a U-shape with an opening on the inside in the shutter width direction (the side approaching the center line CL11 (see Figure 1) of the sheet shutter 10 in the shutter width direction), as shown in Figure 3.

[0025] A cross section of the guide rail 14 cut in a direction perpendicular to the longitudinal direction is U-shaped with an opening on the inside in the shutter width direction. A pair of flanges 16 are formed on the inside of the guide rail 14 in the shutter width direction to narrow the opening width. An engagement piece 40 (described in detail later) that constitutes the curtain unit 30 is supported inside the guide rail 14 so as to be movable in the vertical direction.

[0026] 1, the shutter case 18 is disposed extending in the shutter width direction so as to connect the upper ends of the pair of side frames 22. A cross section of the shutter case 18 cut in a direction perpendicular to the longitudinal direction has a rectangular tubular shape extending from above the side frame 22 to one side (the right side in the figure) in the depth direction of the sheet shutter 10 (hereinafter, "shutter depth direction"), and the inside of the shutter case 18 is hollow.

[0027] [Winding roll] As shown in FIG. 2, the winding roll 20 is disposed inside the shutter case 18 at one side in the shutter depth direction.

[0028] The winding roll 20 extends in the shutter width direction, and the axial direction of the winding roll 20 is the shutter width direction. Furthermore, the winding roll 20 is rotatably supported by a frame member. The winding roll 20 is biased by a biasing member (not shown) so as to rotate in a direction in which the curtain unit 30 is wound up (hereinafter referred to as the "winding direction").

[0029] In this configuration, a force acts on the curtain unit 30 in the direction in which it is wound by the winding roll 20 .

[0030] [Curtain unit] The curtain unit 30 is disposed between a pair of side frames 22 as shown in Fig. 1 in a state where it closes an opening 11 which is a loading entrance of a building such as a warehouse. Also, as shown in Figs. 3 and 4, the curtain unit 30 comprises a sheet curtain 32 and a core material 36 provided at both end portions of the sheet curtain 32 in the shutter width direction. Furthermore, the curtain unit 30 comprises a plurality of engaging pieces 40 attached to both end portions of the sheet curtain 32 in the width direction and arranged side by side in the movement direction of the sheet curtain 32 (the winding direction of the curtain unit 30), and screws 38 for attaching the engaging pieces 40 to the sheet curtain 32.

[0031] [Sheet curtains, core material] As an example, the sheet curtain 32 is formed in a sheet shape by covering a mesh (not shown, plain weave) made of synthetic fibers with a synthetic resin material such as vinyl chloride, and has a rectangular shape extending in the moving direction of the sheet curtain 32. An end of the sheet curtain 32 in the moving direction is attached to the winding roll 20.

[0032] In addition, both end portions of the sheet curtain 32 in the shutter width direction are folded back so as to encase the core material 36. Furthermore, the tips of the folded back portions are welded to other overlapping portions of the sheet curtain 32. In the sheet curtain 32 of this embodiment, the folded-back portion of the sheet curtain 32 is called a folded-back portion 32A.

[0033] The core material 36 extends in the movement direction of the curtain unit 30, and is provided at both ends of the sheet curtain 32 in the width direction. The core material 36 used in this embodiment is a rope-like material formed into a circular cross section by twisting together a plurality of wires made of synthetic resin. Therefore, the core material 36 of this embodiment is lighter than one made by twisting together wires such as steel wires.

[0034] In this way, the portion where the core material 36 is wrapped in the sheet curtain 32 bulges in the thickness direction of the sheet curtain 32 compared to other portions. In the sheet curtain 32 of this embodiment, the portion where the core material 36 is wrapped in the sheet curtain 32 and bulges is called a bead portion 32B. Note that the bead portion 32B of this embodiment has a circular cross-sectional shape.

[0035] [Engagement element, screw] The engaging elements 40 are attached to the folded-back portions 32A on both sides of the sheet curtain 32 in the shutter width direction, and as shown in Fig. 4, a plurality of the engaging elements 40 are lined up adjacent to each other in the moving direction of the sheet curtain 32. In other words, a plurality of the engaging elements 40 are lined up adjacent to each other in the winding direction of the curtain unit 30.

[0036] The engaging element 40 is integrally molded using a resin material. As shown in Fig. 3 and Fig. 5(C) which show a state where the engaging element 40 is disposed inside the guide rail 14, the engaging element 40 has a rectangular shape with a U-shaped groove 42 formed therein that opens on the inside in the shutter width direction when viewed from above. Furthermore, protrusions 44 are formed on the opening ends of the grooves 42.

[0037] A gradually changing portion 42a is formed in the inner portion of the groove 42 in the shutter width direction, where the opening width gradually increases toward the inner portion in the shutter width direction (the opening side in the depth direction of the groove) when viewed from above. Also, a substantially elliptical bead accommodating portion 42b is formed in the outer portion of the groove 42 in the shutter width direction (the side away from the center line CL11 in the shutter width direction of the sheet shutter 10) in the shutter width direction, where the opening width increases when viewed from above. The bead portion 32B of the sheet curtain 32 is disposed inside this bead accommodating portion 42b (see FIG. 3).

[0038] 3, the shape of the bead accommodating portion 42b viewed from above is formed as an ellipse extending in the depth direction of the groove portion 42 so that a gap S1 is formed between the bead portion 32B and the inner peripheral surface on the side opposite to the bottom of the bead accommodating portion 42b when the tip of the bead portion 32B is pressed against the bottom of the bead accommodating portion 42b. That is, the dimension of the bead accommodating portion 42b measured in the depth direction of the groove portion 42 is larger than the dimension measured in the groove width direction of the groove portion 42.

[0039] 5, the engaging element 40 has a side surface 40a facing outward in the shutter width direction, and a through hole 46 having a circular cross section that penetrates from the side surface 40a to the bead receiving portion 42b of the groove portion 42. An enlarged diameter portion 46a whose width gradually increases toward the outside in the shutter width direction is formed in the outer portion of the through hole 46 in the shutter width direction. The enlarged diameter portion 46a is a so-called countersink.

[0040] As shown in Figures 5 and 6, the engaging element 40 is formed with a contact portion 50 that comes into contact with a contact block 80 (see Figure 6) described later, and an engaging portion 54 that engages with an engaging recess 66 of a gear member 64 provided on the driving roll 60.

[0041] In addition, in the engaging element 40, a portion that holds the sheet curtain 32 (folded-back portion 32A) is called a holding portion 43.

[0042] As shown in Figure 3, the engaging element 40 is attached to the widthwise end portion of the sheet curtain 32 by screwing a screw 38 into the through hole 46 from the side surface 40a facing outward in the shutter width direction, and screwing the tip portion of the screw 38 into the core material 36.

[0043] The screw 38 in this embodiment is, for example, a cross recessed countersunk tapping screw (for example, type 1 A). The screw 38 has a head 38A and a threaded portion 38B. As shown in FIG. 3, with the head 38A of the screw 38 disposed in the enlarged diameter portion 46a of the through hole 46, the tip side portion of the threaded portion 38B of the screw 38 is screwed into the core material 36. The head 38A of the screw 38 fits into the enlarged diameter portion 46a of the through hole 46 and does not protrude from the side surface 40a of the engaging element 40.

[0044] 5(D), when viewed from the shutter width direction, the engaging element 40 is symmetrical with respect to a center line CL01 that passes through the center point of the through hole 46 and extends in the gear radial direction. The engaging element 40 is formed with a pair of side surfaces 40b that face in the gear circumferential direction.

[0045] In this configuration, when the engaging element 40 engaged with the engaging recess 66 moves outward in the gear radial direction, the contact surface 50b of the contact portion 50 of the engaging element 40 comes into contact with the inner peripheral surface 80a of the contact block 80. This maintains the engaged state between the engaging portion 54 of the engaging element 40 and the engaging recess 66 of the gear member 64.

[0046] [Drive Roll] 2, the drive roll 60 is disposed inside the shutter case 18, at the other side in the shutter depth direction, and above the pair of guide rails 14. In addition, a part of the curtain unit 30 that can be wound by the winding roll 20 or that can be unwound from the winding roll 20 is wound around the drive roll 60.

[0047] The driving roll 60 extends in the shutter width direction, and the axial direction of the driving roll 60 is the shutter width direction. Furthermore, the driving roll 60 is rotatably supported by a frame member (not shown). The driving roll 60 also includes a roll body 62 extending in the shutter width direction, and a pair of gear members 64 attached to both ends of the roll body 62 in the shutter width direction. The driving roll 60 rotates in both positive and negative directions (K01 and K02 directions in FIG. 6) by the driving force transmitted from a motor (not shown).

[0048] 2 and 6, the gear member 64 is made of metal and has an annular shape, and a plurality of engagement recesses 66 that engage with the engagement portions 54 of the engagement pieces 40 are formed side by side in the circumferential direction on the outer peripheral surface of the gear member 64. Also, a flange 78 that protrudes radially outward relative to other portions is formed on the outer portion of the gear member 64 in the shutter width direction, but the flange 78 may be formed on the inner portion of the gear member 64 in the shutter width direction.

[0049] [Contact block] A pair of contact blocks 80 are provided, and as shown in Fig. 2, they are disposed at the other side in the shutter depth direction and at both end sides in the shutter width direction inside the shutter case 18. Specifically, as shown in Fig. 6, the contact blocks 80 are disposed on opposite sides of the outer periphery of the gear member 64 with the engaging piece 40 sandwiched therebetween.

[0050] The contact block 80 is formed in an arc shape using a metal material and is attached to a frame member (not shown). The contact block 80 has an arc-shaped inner peripheral surface 80a facing the gear member 64 side.

[0051] Here, the distance between the gear member 64 and the contact block 80 is determined so that a slight gap (not shown) is formed between the contact portion 50 of the engaging member 40 and the inner surface 80a of the contact block 80, so that the engaging member 40 can move smoothly when the engaging portion 54 of the engaging member 40 is pressed against the engaging recess 66 of the gear member 64.

[0052] [Guide rail opening, side frame opening] 3, a cross section of the guide rail 14 cut in a direction perpendicular to the longitudinal direction has a U-shape with an opening on the inside in the shutter width direction. The guide rail 14 has a side plate 24 arranged on one side in the shutter depth direction (upper side in the figure) relative to an engaging element 40 arranged inside, and a side plate 26 arranged on the other side in the shutter depth direction (lower side in the figure) relative to the engaging element 40 arranged inside.

[0053] A cross section of the side frame 22 cut in a direction perpendicular to the longitudinal direction is U-shaped with the inside in the shutter width direction open. The guide rail 14 has a side plate 72 arranged on one side in the shutter depth direction (upper side in the figure) of the guide rail 14 arranged inside, and a side plate 74 arranged on the other side in the shutter depth direction (lower side in the figure) of the guide rail 14 arranged inside.

[0054] [Method of attaching the engaging element to the sheet curtain] In this embodiment, the engagement elements 40 are attached to the sheet curtain 32 as follows, for example.

[0055] (1) The engaging element 40 is elastically deformed to open the groove portion 42, and the widthwise end portion of the sheet curtain 32 is inserted into the groove portion 42 and the bead accommodating portion 42b so that the bead portion 32B of the sheet curtain 32 is positioned in the bead accommodating portion 42b, and the groove portion 42 is closed to its original state to hold the engaging element 40 at the widthwise end portion of the sheet curtain 32 (see Figure 7 (A)).

[0056] (2) Next, the screw 38 is screwed into the through hole 46 of the engaging element 40. As the screw 38 is screwed in, the screw 38 advances while rotating in the direction toward the back of the through hole 46. Then, the tip of the screw 38 is screwed into the bead portion 32B while pressing the bead portion 32B (see FIG. 7(B)).

[0057] Finally, as shown in FIG. 7(C), the screw 38 is screwed in until the head 38A of the screw 38 is fitted into the enlarged diameter portion 46a. The above steps are repeated to sequentially attach the engaging pieces 40 to the widthwise ends of the sheet curtain 32.

[0058] [How to repair a curtain unit] The following describes a method for repairing the curtain unit 30. Here, we will explain a method for repairing when the bead portion 32B of the sheet curtain 32 is damaged, specifically, when the inner core material 36 and a part of the sheet curtain 32 are cut (reference numeral 90 indicates a crack), as shown in Fig. 8. In this embodiment, the core material 36 is broken at the crack 90. ​​The crack 90 and the broken portion of the core material 36 are examples of the broken portion of the present disclosure.

[0059] (1) As shown in FIG. 8, the engaging elements 40 around the area where the crack 90 has occurred are removed. In this embodiment, the engaging elements 40 on both sides of the longitudinal direction of the sheet curtain 32 relative to the crack 90, two on each side, for a total of four engaging elements, are removed (an example of the removal process of the present disclosure).

[0060] (2) Next, as shown in Fig. 9, a strip-shaped flat-knit mesh copper wire 92 as an example of a reinforcing member is placed on the outer side of the bead portion 32B in the width direction of the sheet curtain, crossing the crack 90 and along the longitudinal direction of the bead portion 32B so as to cover both sides of the crack 90. ​​At this time, the flat-knit mesh copper wire 92 may be temporarily fixed to the bead portion 32B using an adhesive tape or adhesive.

[0061] The flat-knit mesh copper wire 92 is formed by flat-knitting copper wires into a mesh shape, and can also be called a plain weave fabric made of copper wires. The flat-knit mesh copper wire 92 may be replaced with a metal wire other than copper woven in a weaving method other than plain weaving.

[0062] In this embodiment, the length of the flat knit mesh copper wire 92 is set to the length of approximately four of the engaging elements 40, but the length of the flat knit mesh copper wire 92 can be changed as appropriate.

[0063] (3) Next, the removed connector 40 is attached back to its original position so as to cover the flat knit mesh copper wire 92.

[0064] As a result, the flat-knit mesh copper wire 92 covering the damaged portion and the surface of the bead portion 32B surrounding the damaged portion is sandwiched between the bead portion 32B and the engaging element 40 as shown in Figure 10, and is fixed to the bead portion 32B with the screw 38 penetrating therethrough, allowing the bead portion 32B with the broken core material 36 to be repaired with the flat-knit mesh copper wire 92. In other words, the mesh copper wire 92 connects one end of the broken core material 36 to the other end, and the mesh copper wire 92 can bear the tension in place of the core material 36. In other words, the broken core material 36, the mesh copper wire 92, and the engaging element 40 are integrated.

[0065] In this embodiment, four screws 38 penetrate the flat knit mesh copper wire 92, and therefore the flat knit mesh copper wire 92 is firmly connected to the core material 36 using the four screws 38.

[0066] In addition, in this embodiment, the flat-knit mesh copper wire 92 is used as a repair member for the damaged portion, so that a high reinforcing effect can be obtained.

[0067] It is preferable that the repair material for the damaged portion has a tensile strength equal to or greater than that of the core material 36 .

[0068] It should be noted that the crack 90 in the sheet curtain 32 can be repaired, for example, by adhering a sheet piece 32A (shown by a two-dot chain line) identical to the sheet curtain 32 so as to cover the crack 90.

[0069] [Second embodiment] A method for repairing a curtain unit according to a second embodiment of the present disclosure will be described with reference to Fig. 11. Note that the same components as those in the first embodiment are given the same reference numerals, and descriptions thereof will be omitted.

[0070] In the method for repairing a curtain unit of this embodiment, as shown in Figure 11, instead of the flat-knit mesh copper wire 92 used in the method for repairing a curtain unit of the first embodiment, a repair sheet 94 as an example of a repair member made of a sheet of the same material as the sheet curtain 32 is adhered or welded to the bead portion 32B where the damaged area of ​​the sheet curtain 32 is located, and then an engaging element 40 is fixed.

[0071] In the curtain unit repair method of this embodiment, the repair sheet 94 used for the repair is made of the same material as the sheet curtain 32, making it easier to manage the parts compared to when a sheet of a different material than the sheet curtain 32 is used. Furthermore, since the repair sheet 94 is adhered or welded to the bead portion 32B, a higher reinforcing effect can be obtained compared to a case where the repair sheet 94 is not adhered or welded.

[0072] [Third embodiment] A method for repairing a curtain unit according to a third embodiment of the present disclosure will be described with reference to Fig. 12. Note that the same components as those in the first embodiment are given the same reference numerals, and descriptions thereof will be omitted. In the first embodiment, the core material 36 is formed into a circular cross section by twisting together multiple wires made of synthetic resin. However, the cross section of the core material 36 is not limited to being circular, and may be formed into an elliptical cross section from a synthetic resin such as polyvinyl chloride, as shown in FIG. 12.

[0073] [Other embodiments] While one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above, and it goes without saying that the present disclosure can be implemented in various modified forms without departing from the spirit and scope of the present disclosure.

[0074] In the above first embodiment, a flat-knit mesh copper wire 92 was used as a repair member for the damaged area, but the material of the mesh may be a metal material other than copper, such as stainless steel, and a mesh (woven fabric) made of organic fibers (such as aromatic polyamide, for example) having high tensile strength, for example, a tensile strength equal to or greater than that of the flat-knit mesh copper wire 92, may be used.

[0075] In the above second embodiment, the repair sheet 94 used for repair was a sheet made of the same material as the sheet curtain 32, but a sheet made of a different material from the sheet curtain 32 may also be used, and a metal mesh may be embedded inside the sheet. [Explanation of symbols]

[0076] 30 Curtain Unit 32 Sheet Curtain 32B Bead section 36 Core material 38 Screw (threaded member) 40 Engagement element 46 Through hole 92 Flat mesh copper wire (repair material) 94 Repair sheet (repair material)

Claims

1. A sheet curtain that is wound or unwound on a winding roll and has a bead portion formed by accommodating a core material inside a folded portion formed by folding back an end portion in a width direction; a pinching portion that pinches the folded portion from both sides, a bead accommodating portion that communicates with the pinching portion and accommodates the bead portion, and a through hole that is formed on the opposite side of the pinching portion with respect to the bead accommodating portion and reaches the bead portion, the pinching portion having a plurality of engaging members that engage with a rotatable gear member and are guided by contact blocks provided on the radial outside of the gear member; a screw member that is screwed into the bead portion through the through hole of the engaging element to fix the engaging element to the bead portion; The method for repairing a curtain unit includes: a sheet curtain that is guided by left and right guide rails that are erected at both ends of an opening in a building in a width direction; and the sheet curtain is adapted to open and close the opening. a detachment step of detaching the engaging element adjacent to the broken portion of the core material; a placement step of placing a repair member including a mesh body along the bead portion so as to cover the damaged portion; a mounting step of mounting the engaging element to the bead portion from which the engaging element was detached; a fixing step of screwing the screw member into the bead portion on which the repair member is disposed through the through hole of the engaging element and penetrating the repair member into the bead portion to fix the engaging element to the bead portion; A method for repairing a curtain unit having a

2. The mesh body is a metal mesh. A method for repairing a curtain unit according to claim 1.

3. The core material is formed of a synthetic resin. A method for repairing a curtain unit according to claim 1 or 2.

4. The sheet curtain is a sheet in which a mesh body made of synthetic fibers is covered with a synthetic resin, The repair member is made of a sheet of the same material as the sheet curtain, In the positioning step, the sheet and the repair member are bonded to each other. A method for repairing a curtain unit according to claim 1.

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