Fastener stringer

Abstract

To provide a fastener stringer for a hidden slide fastener capable of preventing a film member from being cut and being partially cut.SOLUTION: A fastener stringer (10) includes a fastener tape (20) and a plurality of fastener elements (40). The fastener tape (20) includes a hollow-weaving part (25) for holding a film member (60). The hollow-weaving part (25) includes: a first weaving part (26); a second weaving part (27); a first connection part (28) for connecting the first weaving part (26) to the second weaving part (27); and a second connection part (29) for connecting the first weaving part (26) to the second weaving part (27) and also to be arranged closer to a tape main body part (21) than the first connection part (28). An element attachment part (23) includes: at least a part of the hollow-weaving part (25); and a tape extension part (24) extending from the first connection part (28) of the hollow-weaving part (25) and to be formed by single-weaving.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a fastener stringer for a concealed slide fastener. [Background technology]

[0002] One type of slide fastener is a hidden slide fastener that, when the left and right fastener elements are interlocked, can conceal the interlocked fastener elements from view from the outer surface of the slide fastener.

[0003] WO 2011 / 030442 (Patent Document 1) describes a fastener stringer used in a concealed slide fastener. The fastener stringer in Patent Document 1 has a woven fastener tape and a coil-shaped fastener element sewn to the fastener tape.

[0004] The fastener tape has a tape main body, a tape folding portion extending in the tape width direction from one side edge of the tape main body and folded into a U-shape, and an element mounting portion extending further from the tape folding portion. In the tape width direction of the fastener tape, a hollow woven portion is provided at the element mounting portion of the fastener tape and at a part of the tape folding portion. Two film bodies are stacked and enclosed within the hollow woven portion of the fastener tape.

[0005] The fastener element is sewn together with two film bodies to the element attachment portion of the fastener tape by a double chain stitch using a sewing thread including two needle threads and one looper thread. In this case, two sewing machine needles performing the double chain stitch pierce the film body in the hollow woven portion during the sewing process for sewing the fastener element to the fastener tape, so that multiple pairs of through holes are formed in the length direction of the film body, and a needle thread is passed through each through hole. As a result, the fastener element and the film body are fixed to the element attachment portion of the fastener tape by the sewing thread.

[0006] Furthermore, in the fastener stringer of Patent Document 1, the rigidity of the hollow woven portion of the fastener tape is increased by the film body within the hollow woven portion. Therefore, in a concealed slide fastener manufactured using the fastener stringer of Patent Document 1, for example, when the left and right fastener elements are engaged and a lateral pulling force is applied to the left and right fastener tapes that pulls them outward in the left-right direction, the formation of a gap between the left and right fastener tapes can be prevented or suppressed. This allows the concealment of the concealed slide fastener to be improved. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] International Publication No. 2011 / 030442 Summary of the Invention [Problem to be solved by the invention]

[0008] In the fastener stringer of Patent Document 1, in which the fastener elements and the film body are sewn to the fastener tape by a double chain stitch with sewing thread, as described above, multiple pairs of through holes are formed in the film body along its length during the sewing process. Furthermore, in such a sewing process, a sewing needle must be pierced through the film body, which is harder than the fastener tape, so a thick sewing needle is often used. This makes it easy for the film body to be cut or partially torn at the portions where the through holes are formed during or after the sewing process. As a result, the strength of the film body is reduced, which may reduce the concealment properties of the concealed slide fastener or affect the sliding properties of the slider.

[0009] Furthermore, in the case of the fastener stringer of Patent Document 1, when sewing is performed using a sewing machine with two sewing needles, one of the sewing needles positioned on the outside in the left-right direction moves up and down at a position outside the fastener tape in the tape width direction, which sometimes makes it impossible for that sewing needle to pierce the fastener tape.

[0010] In this way, if the sewing position of one sewing needle deviates from the fastener tape during sewing, it causes problems such as a weakening of the force with which the sewing thread secures the fastener element to the fastener tape, a poor appearance of the fastener stringer, etc. Furthermore, if the sewing position of the sewing needle deviates from the fastener tape continuously, the sewing thread becomes more likely to come out of the fastener tape, which can result in problems such as the sewing thread getting caught on the slider or being easily cut.

[0011] The present invention has been made in consideration of the above-mentioned conventional problems, and aims to provide at least one of the following: a fastener stringer for a hidden slide fastener that can make it difficult for the film member fixed to the fastener tape to be cut or partially torn, and a fastener stringer for a hidden slide fastener that can stably pierce the fastener tape with two sewing machine needles during the sewing process of sewing fastener elements to the fastener tape. [Means for solving the problem]

[0012] In order to achieve the above object, the fastener stringer provided by the present invention is a fastener stringer for a concealed slide fastener, which has a fastener tape having a woven structure and a plurality of fastener elements, and the fastener tape has, in a cross section perpendicular to the longitudinal direction of the fastener stringer, a tape main body portion, a tape folding portion extending from one side edge of the tape main body portion and folded into a U-shape, and an element attachment portion extending from the tape folding portion and to which the fastener elements are sewn with sewing thread, and the fastener tape has a hollow woven portion formed by double weaving in a part of the fastener tape. In the cross-sectional view of the fastener stringer, the hollow woven portion has a first woven portion that forms a first surface of the fastener tape, a second woven portion that forms a second surface of the fastener tape, a first bonding portion that connects the first woven portion and the second woven portion, and a second bonding portion that connects the first woven portion and the second woven portion and is positioned closer to the tape main portion than the first bonding portion, and at least one film member is held within the hollow woven portion, and the element mounting portion has a part of the hollow woven portion and a tape extension portion that extends from the first bonding portion of the hollow woven portion and is formed by a single weave.

[0013] In the fastener stringer of the present invention, the tape extension portion preferably includes two or more warp threads. It is also preferable that the fastener element is sewn to the element mounting portion by double chain stitching of the sewing thread including two needle threads, one of the needle threads having a portion that penetrates the fastener tape and the film member, and the other needle thread having a portion that penetrates the fastener tape without penetrating the film member.

[0014] In this case, when the film member is divided into three regions of equal width in the cross-sectional view of the fastener stringer, namely, an outer region close to the tape extension portion, a central region including the central portion of the film member in the width direction, and an inner region away from the tape extension portion, it is preferable that one of the needle threads penetrates the film member within the region including the outer region and central region of the film member. [Effects of the Invention]

[0015] The fastener stringer of the present invention can make it difficult for the film member fixed to the fastener tape to be cut. Also, when a concealed slide fastener is manufactured using the fastener stringer of the present invention, the film member can enhance the concealment of the concealed slide fastener. Furthermore, the fastener stringer of the present invention can prevent the sewing positions of two sewing needles from shifting from the fastener tape during the sewing process of sewing fastener elements to the fastener tape, allowing each sewing needle to stably pierce the fastener tape. [Brief explanation of the drawings]

[0016] [Figure 1] 1 is a cross-sectional view schematically showing a cross section perpendicular to the front-to-rear direction of a hidden slide fastener according to an embodiment of the present invention. [Figure 2] FIG. 2 is an enlarged cross-sectional view schematically illustrating a portion of the fastener stringer according to the embodiment of the present invention. [Figure 3] FIG. 2 is a structure diagram showing a part of the weave of the fastener tape. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a cross-sectional view schematically showing a cross section perpendicular to the front-rear direction of the concealed slide fastener of this embodiment. Fig. 2 is a cross-sectional view schematically showing an enlarged portion of the fastener stringer of this embodiment. Fig. 3 is a texture diagram showing the weave of a portion of the fastener tape.

[0018] In the drawings referred to in the description of the present embodiment, various warp and weft yarns are shown relatively thick and the weave of the fastener tape is shown coarsely in order to make the features of the present invention easier to understand. However, in an actual fastener stringer, predetermined yarns having predetermined thicknesses are used for the warp and weft yarns forming the fastener tape, and the weave of the fastener tape is also formed in a finely woven structure.

[0019] In the following description, the front-to-rear direction is the direction along the tape length direction of the fastener tape 20 and also the direction along the sliding direction of the slider. Furthermore, with regard to the front-to-rear direction, the direction in which the slider slides when closing the hidden slide fastener 1 is referred to as the front, and the direction in which the slider slides when opening the hidden slide fastener 1 is referred to as the rear.

[0020] The left-right direction is the direction along which a pair of fastener stringers 10 are moved toward or away from each other in the hidden slide fastener 1. Furthermore, with regard to the left-right direction, the side of each left and right fastener stringer 10 that approaches the other fastener stringer 10 is the inside in the left-right direction, and the side that moves away from the other fastener stringer 10 is the outside in the left-right direction. The tape width direction is the direction perpendicular to the thickness of the fastener tape 20 and along the fastener tape 20 in a cross-sectional view perpendicular to the front-rear direction of the fastener stringer 10.

[0021] The up-down direction is a direction perpendicular to the front-to-back direction and the left-to-right direction in the hidden slide fastener 1, and in the hidden slide fastener 1 in which the left and right fastener elements 40 are interlocked, is a direction along the front-to-back direction of the hidden slide fastener 1. In this case, the side on which the left and right fastener tapes 20 are arranged relative to the left and right fastener elements 40 is the upper side, and the side on which the left and right fastener elements 40 are arranged relative to the left and right fastener tapes 20 is the lower side.

[0022] The hidden slide fastener 1 of this embodiment shown in Figure 1 has a pair of left and right fastener stringers 10, each having a plurality of fastener elements 40 attached to the left and right fastener tapes 20, and a slider (not shown) slidably attached to the element row formed by the plurality of fastener elements 40.

[0023] The concealed slide fastener 1 of this embodiment is used by being attached to, for example, a seat cover for an automobile seat. Note that in the present invention, the use of the concealed slide fastener 1 is not particularly limited. The slider is formed in substantially the same manner as sliders commonly used in conventional concealed slide fasteners. For this reason, in this embodiment, a specific description of the slider will be omitted.

[0024] Each of the left and right fastener stringers 10 has a fastener tape 20 formed long and narrow in the front-to-rear direction, and a plurality of fastener elements 40 sewn to the tape side edges of the fastener tape 20 with sewing thread (sewing thread) 50.

[0025] The multiple fastener elements 40 are attached to the back surface side of the hidden slide fastener 1 relative to the fastener tape 20. When the left and right fastener elements 40 are interlocked and the hidden slide fastener 1 is closed, the interlocked left and right fastener elements 40 are covered from above by the left and right fastener tapes 20, so the fastener elements 40 can be made invisible from the outer surface side (the surface side exposed to the outside) of the hidden slide fastener 1.

[0026] In each fastener stringer 10, the multiple fastener elements 40 are formed by winding and molding a monofilament made of a thermoplastic resin such as polyamide or polyester into a coil shape. Therefore, the multiple fastener elements 40 have a continuous coil shape in which each fastener element is connected to an adjacent fastener element in the front-rear direction.

[0027] A plurality of consecutive fastener elements 40 are fixed to the element mounting portion 23 of the fastener tape 20 described later by double chain stitching with sewing thread 50, thereby forming an element row consisting of a plurality of fastener elements 40 along the front-to-rear direction of the fastener tape 20.

[0028] Each fastener element 40 has an interlocking head 41 that interlocks with the mating fastener element 40, an upper leg portion 42 and a lower leg portion 43 that extend in the left-right direction from the upper end and lower end of the interlocking head 41, respectively, and a connecting portion 44 that connects the upper leg portion 42 (or lower leg portion 43) of the fastener element 40 to the lower leg portion 43 (or upper leg portion 42) of the fastener element 40 adjacent in the front-to-rear direction.

[0029] In this embodiment, the upper leg portion 42 of the fastener element 40 is disposed in contact with the fastener tape 20, and the lower leg portion 43 is disposed away from the fastener tape 20. A flexible core cord member 45 is inserted between the upper leg portion 42 and the lower leg portion 43 of the fastener element 40. This core cord member 45 is fixed to the fastener tape 20 together with the fastener element 40 by a sewing thread 50.

[0030] Each of the left and right fastener tapes 20 has a weave structure and is formed by weaving a plurality of warp threads 31 and weft threads 32 into a long, narrow strip shape. Each warp thread 31 is made of polyester fiber having a fineness of 167 dtex or more and 500 dtex or less. In this embodiment, the plurality of warp threads 31 forming the fastener tape 20 have the same fineness.

[0031] The weft yarn 32 is made of polyester fiber having a fineness of 333 dtex or more and 600 dtex or less. The weft yarn 32 in this embodiment is in the form of a two-ply yarn formed by paralleling two yarns, and is arranged so as to cross the warp yarn 31. In the following, the weft yarn 32 formed by paralleling two yarns will be described as a single weft yarn 32. In addition, in the present invention, the materials and finenesses of the warp yarn 31 and the weft yarn 32 are not particularly limited.

[0032] In a cross-sectional view of the hidden slide fastener 1 (Figure 1), each of the left and right fastener tapes 20 has a tape main body portion 21, a tape folding portion 22 extending in the tape width direction from one side edge of the tape main body portion 21 and folded into a U-shape, and an element mounting portion 23 extending in the tape width direction from the tape folding portion 22 and to which a fastener element 40 is attached.

[0033] The tape main body 21 of the fastener tape 20 is formed by single weaving, and has a portion to be sewn to a fastener-receiving product such as a seat cover for an automobile seat. For example, the concealed slide fastener 1 of this embodiment is attached to an automobile seat by sewing the tape main body 21 of the fastener tape 20 to the seat cover. Note that in the present invention, the specific form of the weave structure, the dimension in the tape width direction, etc. of the tape main body 21 of the fastener tape 20 is not limited.

[0034] The tape folding portion 22 of the fastener tape 20 is arranged between the tape main body 21 and the element mounting portion 23 in the tape width direction, and is formed by folding in a U-shape so that the tape main body 21 and the element mounting portion 23 overlap in the vertical direction.

[0035] The element mounting portion 23 is disposed below the tape main body portion 21 so as to face the tape main body portion 21. A hollow woven portion 25 formed by double weaving is provided between the tape folding portion 22 and the element mounting portion 23, and two film members 60 are held in a vertically overlapping state within this hollow woven portion 25.

[0036] Here, the weave of the tape folding portion 22 and the element mounting portion 23 of the fastener tape 20 will be described with reference to Fig. 2 and Fig. 3. In the weave diagram of Fig. 3, one intersection where the warp thread 31 intersects with the weft thread 32 is shown by one square. In Fig. 3, the black squares indicate intersections where the warp thread 31 floats above the weft thread 32 (the warp thread 31 is arranged above the weft thread 32), and the white squares indicate intersections where the weft thread 32 floats above the warp thread 31 (the weft thread 32 is arranged above the warp thread 31).

[0037] In this embodiment, the tape folding portion 22 and the element mounting portion 23 of the fastener tape 20 have one hollow woven portion 25 formed in the tape folding portion 22 and the element mounting portion 23, a first folding portion formed by single weave between the hollow woven portion 25 and the tape main body portion 21, and a tape extension portion 24 extending from the side edge portion of the hollow woven portion 25 on the element mounting portion 23 side.

[0038] Therefore, the tape folding portion 22 has a first folding portion formed by a single weave and a second folding portion formed by a part of the hollow woven portion 25. The element mounting portion 23 has a first mounting portion formed by the remaining part of the hollow woven portion 25 excluding the second folding portion, and a second mounting portion formed by the tape extending portion 24. In addition, the tape extending portion 24 of the element mounting portion 23 is formed by a single weave.

[0039] In this embodiment, the first folded portion of the tape folded portion 22 is formed of a 2 / 2 twill weave in which each warp thread 31 is alternately arranged above two sets of weft threads 32 and below two sets of weft threads 32, as shown in Fig. 3. Note that in the present invention, the weave of the first folded portion is not particularly limited as long as it is formed of a single weave.

[0040] The hollow woven portion 25 is formed continuously in the tape width direction over a part of the tape folding portion 22 and a part of the element mounting portion 23. In a cross-sectional view of the fastener stringer 10 (see FIG. 2), the hollow woven portion 25 has an upper woven portion (first woven portion) 26 that forms the inner peripheral surface of the tape of the hollow woven portion 25, a lower woven portion (second woven portion) 27 that forms the outer peripheral surface of the tape of the hollow woven portion 25, a first bonding portion 28 that connects the upper woven portion 26 and the lower woven portion 27 on the element mounting portion 23 side, and a second bonding portion 29 that connects the upper woven portion 26 and the lower woven portion 27 on the tape folding portion 22 side.

[0041] The warp threads 31 forming the hollow woven portion 25 include upper warp threads 31a arranged in the upper woven portion 26, lower warp threads 31b arranged in the lower woven portion 27, first binding warp threads 31c arranged in the first binding portion 28, and second binding warp threads 31d arranged in the second binding portion 29. The inner peripheral surface of the tape of the hollow woven portion 25 is a first surface that forms one side of the fastener tape 20, and the outer peripheral surface of the tape of the hollow woven portion 25 is a second surface that forms the other side of the fastener tape 20.

[0042] In this embodiment, the upper woven portion 26 is formed by a plurality of upper warps 31a and wefts 32. As shown in FIG. 3 , each upper warp 31a forming the upper woven portion 26 is arranged in a 3 / 1 design, in which it passes over three wefts 32 in succession and then passes under one weft 32 in a repeated sequence. The lower woven portion 27 is formed by a plurality of lower warps 31b and wefts 32. Each lower warp 31b forming the lower woven portion 27 is arranged in a 1 / 3 design, in which it passes over one weft 32 in succession and then passes under three wefts 32 in a repeated sequence.

[0043] The first and second weaving portions 28 and 29 are formed by warp threads 31 that cross both the weft thread 32 that is threaded through the upper woven portion 26 and the weft thread 32 that is threaded through the lower woven portion 27. The first and second weaving portions 28 and 29 are each formed by a single warp thread 31. The first binding warp thread 31c forming the first binding portion 28 and the second binding warp thread 31d forming the second binding portion 29 are arranged in a 2 / 2 weave in which the warp thread 31 passes over two weft threads 32 in succession, and then passes under two weft threads 32 in succession.

[0044] In addition, in this embodiment, the first binding warp thread 31c forming the first binding portion 28 crosses the weft thread 32 so that when the weft thread 32 arranged in the upper weaving portion 26 passes below the upper warp thread 31a adjacent to the first binding portion 28 in the upper weaving portion 26, it passes below the first binding warp thread 31c, and when the weft thread 32 arranged in the lower weaving portion 27 passes above the lower warp thread 31b adjacent to the first binding portion 28 in the lower weaving portion 27, it passes above the first binding warp thread 31c.

[0045] As described above, the first binding warp thread 31c and the weft thread 32 intersect, so that the positions of the outer edge portions of the two film members 60 held in the hollow woven portion 25 can be stably regulated by the first binding portion 28. In addition, the weft thread 32 intersecting the first binding portion 28 makes it easier to press the two film members 60 toward the second binding portion 29 of the hollow woven portion 25.

[0046] The two film members 60 are inserted into the hollow weave portion 25 of the fastener tape 20 at the same time as the fastener tape 20 is woven. In this case, the two film members 60 are set as one of the warp threads on a loom capable of double weaving. As shown in Fig. 3, the two film members 60 are inserted and held in the hollow weave portion 25 to be woven by passing continuously above the two weft threads 32 passing through the lower weaving portion 27, and then crossing the weft threads 32 so as to pass continuously below the two weft threads 32 passing through the upper weaving portion 26.

[0047] The tape extension portion 24 provided on the element mounting portion 23 extends from the first bonding portion 28 of the hollow woven portion 25 in a direction away from the tape folded portion 22. The tape extension portion 24 is formed in a single weave using a plurality of warp yarns 31 and weft yarns 32 that do not form the hollow woven portion 25. In the present embodiment, each warp yarn 31 forming the tape extension portion 24 is arranged in a 2 / 2 weave in which the warp yarn 31 passes continuously over two weft yarns 32 and then passes continuously under two weft yarns 32. In the present invention, the weave of the tape extension portion 24 is not particularly limited as long as it is formed in a single weave.

[0048] The number of warp threads 31 forming this tape extension portion 24 is preferably two or more. By forming the tape extension portion 24 using two or more warp threads 31, it is possible to ensure an appropriate dimension of the tape extension portion 24 in the tape width direction. As a result, when performing sewing processing using a double chain stitch sewing machine as described below, as shown in FIG. 2, a first sewing needle 71, which is arranged on the outside of two sewing needles 70 of the sewing machine, can stably pierce the fastener tape 20 at a position outside the film member 60 of the fastener tape 20.

[0049] Here, with regard to the two sewing needles 70 arranged in the double chain stitch sewing machine, the sewing needle 70 (the outer sewing needle 70 in the left-right direction) that pierces the fastener tape 20 on the side away from the tape folding portion 22 of the fastener tape 20 is defined as the first sewing needle 71, and the sewing needle 70 (the inner sewing needle 70 in the left-right direction) that pierces the fastener tape 20 on the side closer to the tape folding portion 22 is defined as the second sewing needle 72 (see FIG. 2). In addition, the distance between the first sewing needle 71 and the second sewing needle 72 is set to a predetermined size depending on the size of the fastener element 40 that is the sewing object.

[0050] Furthermore, the number of warp threads 31 forming the tape extension portion 24 is preferably 5 or less. By forming the tape extension portion 24 using 5 or less warp threads 31, in the manufactured concealed slide fastener 1, it is possible to prevent problems such as the tape extension portion 24 of the fastener tape 20 getting caught on the slider when the slider slides, and it is possible to reduce the effect of the tape extension portion 24 on the sliding properties of the slider.

[0051] For example, in this embodiment, the tape extension portion 24 is formed by two warp threads 31 and a weft thread 32. Specifically, the tape extension portion 24 in this embodiment is formed so that the distance from the tape side edge of the fastener tape 20 to the film member 60 in the tape width direction is 0.30 mm or more, preferably 0.40 mm or more.

[0052] The two film members 60 held within the hollow woven portion 25 of the fastener tape 20 are made of polyester resin. The two film members 60 are made of the same synthetic resin and have the same thickness. In the present invention, the material of the film members 60 is not particularly limited; in addition to polyester resin, synthetic resins such as polypropylene resin, nylon resin, and polycarbonate resin can be used. In the present invention, two film members 60 made of different materials may be held within the hollow woven portion 25. Furthermore, the film member of the present invention includes not only a member formed from a synthetic resin into a film, but also a film-like or thin member, such as a member formed by hardening or softening at least a portion of a woven or knitted fabric. In this case, the film member preferably has higher rigidity than the fastener tape.

[0053] When the above-mentioned sewing machine (double chain stitch sewing machine) is used to perform the sewing process of sewing the fastener elements to the fastener tape, the two film members 60 are pierced by the second sewing needle 72 of the sewing machine but not by the outer first sewing needle 71. Therefore, in the film member 60 after the sewing process, a plurality of through holes are formed at regular or approximately regular intervals in a row in the length direction of the film member 60.

[0054] Furthermore, the film member 60 is divided into three regions having equal width dimensions, for example, in the tape width direction, such as an outer region close to the tape extension portion 24, a central region including the central portion in the width direction of the film member 60, and an inner region away from the tape extension portion 24. In this case, in this embodiment, when performing the above-described sewing process, the second sewing needle 72 of the sewing machine pierces the film member 60 in a region including the outer region and the central region of the film member 60 (in other words, a region of the film member 60 other than the inner region), thereby forming a through hole in the region including the outer region and the central region of the film member 60.

[0055] In particular, in this case, it is preferable that the second sewing needle 72 pierces the film member 60 at or near the center of the film member 60 in the tape width direction, thereby forming a through hole in the film member 60. By forming a through hole in or near the center of the film member 60 in the tape width direction in this manner, it is possible to prevent or suppress the film member 60 from being partially cut or severed due to the through hole.

[0056] Furthermore, when the second sewing needle 72 penetrates the film member 60, the film member 60 may be subjected to stress from the sewing needle 70, frictional forces, etc., which may cause the film member 60 to deform into a wavy, undulating shape in the thickness direction of the film member 60 around the through hole in the film member 60.

[0057] On the other hand, the inner region of the film member 60 located closer to the tape main body 21 (preferably a region more inward than the center of the film member 60 in the tape width direction) is less susceptible to deformation caused by the second sewing needle 72 penetrating the film member 60, making it easier to maintain the upper and lower surfaces of the film member 60 in a flat state. As a result, the left and right film members 60 can stably press the tape folding portion 22 of the fastener tape 20, thereby improving the concealment of the hidden slide fastener 1, as will be described later.

[0058] In addition, in a cross-sectional view of the hidden slide fastener 1 (see FIG. 1), it is preferable that the position of the outer side edge of the film member 60 in the left-right direction is arranged in a position more inward than the outermost side edge in the left-right direction of the fastener element 40, and in particular, more inward than the connecting portion 44 of the fastener element 40. By arranging the film member 60 in this manner, it is possible to easily arrange a first needle thread 51a (described later) of the sewing thread 50 that is inserted into the fastener tape 20 by the first sewing needle 71 without passing through the film member 60.

[0059] Each of the upper and lower film members 60 has a thickness of 0.05 mm or more and 0.30 mm or less, preferably 0.15 mm or more and 0.20 mm or less. When the thickness of the film member 60 is 0.05 mm or more, the rigidity of the hollow woven portion 25 of the fastener tape 20 can be appropriately increased. When the thickness of the film member 60 is 0.30 mm or less, it becomes easier to pierce the film member 60 with a sewing needle 70 when sewing the fastener element 40 and the fastener tape 20. In the present invention, the thickness of the film member 60 can be changed as appropriate depending on the material of the film member 60, etc.

[0060] In this embodiment, as described above, two film members 60 are inserted and held in the hollow woven portion 25. However, in the present invention, it is sufficient that at least one film member is held in the hollow woven portion 25, and the number of film members held in the hollow woven portion 25 is not particularly limited. In other words, only one film member may be held in the hollow woven portion 25, or three or more film members may be held, depending on, for example, the material and thickness of the film member used.

[0061] In each of the left and right fastener stringers 10, the sewing thread 50 that sews the fastener elements 40 and the film member 60 to the fastener tape 20 includes two needle threads 51 that pass through the fastener tape 20 and one looper thread 52 that intersects with the two needle threads 51. The needle threads 51 in this embodiment include an outer first needle thread 51a that is passed through the fastener tape 20 by the above-mentioned first sewing machine needle 71 of the sewing machine, and an inner second needle thread 51b that is passed through the fastener tape 20 by the above-mentioned second sewing machine needle 72.

[0062] In this embodiment, when sewing with a sewing machine, the first sewing needle 71 and the second sewing needle 72 pierce the fastener tape 20 and the film member 60, so that the first needle thread 51a of the sewing thread 50 penetrates the fastener tape 20 at a position outside the film member 60 and intersects with the looper thread 52. In other words, the first needle thread 51a is arranged so as to have a portion that penetrates the element attachment portion 23 of the fastener tape 20 without penetrating the film member 60.

[0063] In the present invention, the first needle thread 51a of the sewing thread 50 may have a portion that penetrates the fastener tape 20 and the film member 60. In addition, the first needle thread 51a may or may not penetrate the core cord member 45.

[0064] The second needle thread 51b of the sewing thread 50 is arranged to have a portion that passes through both the fastener tape 20 and the film member 60. The second needle thread 51b also has a portion that passes through the core cord member 45. Therefore, when viewing a cross section perpendicular to the front-to-rear direction of the fastener stringer 10, the film member 60 is fixed to the fastener tape 20 by the second needle thread 51b, which is arranged on the inner side of the two needle threads 51 of the sewing thread 50. Furthermore, at least the above-mentioned inner region of the film member 60 is held within the hollow woven portion 25 without including a portion through which the sewing thread 50 (needle thread 51) passes.

[0065] Next, a method for manufacturing the fastener stringer 10 according to this embodiment will be described. First, a loom is used to weave the fastener tape 20 having the weave structure shown in Fig. 3 by inserting the weft 32 into the opening of the warp threads 31 set on the loom by reciprocating a carrier bar. At this time, a double-woven hollow portion 25 is formed in the woven fastener tape 20. Furthermore, when weaving the fastener tape 20, two overlapping film members 60 are set as one of the warp threads 31, so that the film member 60 is woven into the hollow portion 25 of the fastener tape 20.

[0066] This results in weaving a strip-shaped fastener tape 20 in which the film members 60 are held within the hollow woven portion 25. At this time, the two film members 60 are held in a straight state in the length direction of the film members 60 within the hollow woven portion 25. Furthermore, no through holes have been formed in the film members 60 yet.

[0067] Next, a double chain stitch sewing machine is used to perform a sewing process in which the coil-shaped fastener elements 40 are sewn to the element attachment portion 23 of the fastener tape 20 woven as described above. In the sewing process using the double chain stitch sewing machine, the multiple fastener elements 40 are sewn to the element attachment portion 23 of the belt-shaped fastener tape 20 before being folded into a U shape with a sewing thread 50, with the core cord member 45 inserted between the upper leg portion 42 and the lower leg portion 43 of each fastener element 40.

[0068] In this sewing process, the first sewing needle 71 disposed on the outside of the sewing machine is caused to pierce the fastener tape 20 at a position outside the film member 60 of the fastener tape 20, as described above, and the second sewing needle 72 of the sewing machine is caused to pierce the fastener tape 20 and the film member 60 in a region including the outer region and the central region of the film member 60. At this time, since the fastener tape 20 of this embodiment has the single-woven tape extension portion 24 extending outward from the hollow woven portion 25, as described above, the first sewing needle 71 can be caused to stably pierce the fastener tape 20 at a position outside the film member 60 of the fastener tape 20.

[0069] Furthermore, each fastener element 40 is sewn to the element mounting portion 23 of the fastener tape 20 by a sewing thread 50 with its engaging head 41 facing the tape folding portion 22 of the fastener tape 20 and its upper leg portion 42 in contact with the fastener tape 20.

[0070] At this time, when the fastener element 40 is sewn to the fastener tape 20, the two film members 60 held within the woven portion 25 are fixed to the fastener tape 20 by the sewing thread 50 as the second sewing needle 72 of the sewing machine pierces the film members 60 together with the fastener tape 20. Furthermore, by this sewing process, a plurality of through holes arranged in a row in the longitudinal direction of the film member 60 are formed in the film member 60 within an area including the outer region and central region of the film member 60, preferably at or near the center of the film member 60 in the tape width direction.

[0071] After the above-described sewing process, the fastener tape 20 to which the fastener elements 40 are sewn is folded into a U-shape at the tape folding portion 22, causing the interlocking heads 41 of the fastener elements 40 to protrude outward from the tape folding portion 22. At this time, the film member 60 in the hollow woven portion 25 is fixed by the sewing thread 50. In addition, the position of the outer edge portion of the film member 60 is regulated by the first bonding portion 28 of the hollow woven portion 25. Therefore, even when the fastener tape 20 is folded into a U-shape, the position of the film member 60 is prevented from shifting in the tape width direction within the hollow woven portion 25, and the position of the film member 60 can be stably maintained.

[0072] After the fastener tape 20 is folded as described above, the fastener stringer 10 is subjected to heat setting or the like in order to maintain the shape of the fastener tape 20. In this way, the fastener stringer 10 of this embodiment is manufactured. Furthermore, the manufactured fastener stringers 10 are combined into a pair on the left and right, and sliders are attached to the element rows of the left and right fastener stringers 10, thereby manufacturing the concealed slide fastener 1 shown in FIG.

[0073] In the hidden slide fastener 1 of this embodiment manufactured by the above process, two film members 60 are fixed within the hollow woven portions 25 of the left and right fastener tapes 20, respectively, and therefore the rigidity of the area where the hollow woven portions 25 of the fastener tape 20 are formed is increased by the film members 60.

[0074] In particular, in this embodiment, the film member 60 is disposed across the element attachment portion 23 and the tape folding portion 22. Furthermore, in the inner region of the film member 60 disposed at the tape folding portion 22, no through-hole is formed by the sewing needle 70, and no deformation occurs due to the piercing of the sewing needle 70.

[0075] Therefore, in the concealed slide fastener 1, when the left and right fastener elements 40 are in an interlocking state, the film member 60 can press the tape folding portions 22 of the left and right fastener tapes 20 up to the position where the tape folding portions 22 come into close contact with each other or up to the vicinity of the position where they come into close contact with each other, and the rigidity of the fastener tape 20 can be increased. As a result, the close contact state between the left and right tape folding portions 22 can be stably maintained.

[0076] Therefore, in the concealed slide fastener 1 of this embodiment, even if a lateral pulling force is applied when the left and right fastener elements 40 are interlocked, a gap is unlikely to form between the left and right fastener tapes 20, making it possible to make the fastener elements 40 less visible from above the concealed slide fastener 1. This makes it possible to improve the concealment of the concealed slide fastener 1.

[0077] Furthermore, in this embodiment, by providing the tape extension portion 24 on the fastener tape 20, it is possible to pierce the fastener tape 20 with both the first sewing needle 71 and the second sewing needle 72 of the double chain stitch sewing machine without piercing the film member 60 with the first sewing needle 71. This allows the fastener elements 40 to be stably sewn to the fastener tape 20. Also, the number of through holes formed in the film member 60 by the sewing needles 70 can be limited to one in the width direction of the film member 60.

[0078] Therefore, compared to the concealed slide fastener of Patent Document 1, for example, in which two through holes are formed in the film member along the width direction, the concealed slide fastener 1 of this embodiment makes it difficult for the film member 60 to be cut or partially torn, and can appropriately and stably ensure the strength of the film member 60. As a result, it is possible to prevent or suppress a decrease in the performance of the concealment property of the concealed slide fastener 1, such as the sliding property of the slider, caused by cutting or tearing of the film member 60.

[0079] In addition, during sewing processing by a sewing machine, the sewing position of the outer first sewing needle 71 can be prevented from coming off the fastener tape 20. This allows the fastener element 40 to be firmly fixed to the fastener tape 20 by the sewing thread 50. Furthermore, it is possible to prevent problems such as the appearance of the fastener stringer becoming poor, the sewing thread getting caught on the slider, and the sewing thread becoming more likely to break, which are caused by the sewing position of the first sewing needle 71 coming off the fastener tape 20.

[0080] The present invention is not limited to the above-described embodiments, and various modifications are possible as long as they have substantially the same configuration as the present invention and provide similar effects. For example, in the above-described embodiment, the multiple fastener elements 40 are formed in a continuous coil shape. However, in the present invention, the shape of the fastener elements is not limited, and the multiple fastener elements may be formed in a continuous zigzag shape by having multiple bent portions that bend at right angles, for example. [Explanation of symbols]

[0081] 1. Hidden slide zipper 10 Zipper Stringer 20 zipper tape 21 Tape main body 22 Tape folding section 23 Element mounting part 24 Tape extension 25 Bag Weaving Section 26 Upper woven part (first woven part) 27 Lower woven part (second woven part) 28 1st connection part 29 Second connection part 31 Warp threads 31a Upper warp 31b Lower warp 31c 1st binding warp 31d Second binding warp 32 Weft 40 Fastener element 41 Interlocking head 42 Upper leg 43 Lower leg 44 Connecting part 45 Core cord member 50 Sewing thread (sewing thread) 51 Needle thread 51a 1st needle thread 51b 2nd needle thread 52 Looper thread 60 Film material 70 Sewing Needles 71 No. 1 sewing needle 72 Second sewing needle

Claims

1. A fastener stringer (10) for a concealed slide fastener (1) having a fastener tape (20) with a woven structure and a plurality of fastener elements (40), The fastener tape (20), in a cross section perpendicular to the longitudinal direction of the fastener stringer (10), has a tape main body (21), a tape folding portion (22) extending from one side edge of the tape main body (21) and folded into a U-shape, and an element attachment portion (23) extending from the tape folding portion (22) and to which the fastener element (40) is sewn with a sewing thread (50), The fastener tape (20) has a hollow woven portion (25) formed by double weaving in a part of the fastener tape (20), In the cross-sectional view of the fastener stringer (10), the hollow woven portion (25) has a first woven portion (26) forming a first surface of the fastener tape (20), a second woven portion (27) forming a second surface of the fastener tape (20), a first bonding portion (28) connecting the first woven portion (26) and the second woven portion (27), and a second bonding portion (29) connecting the first woven portion (26) and the second woven portion (27) and positioned closer to the tape main body portion (21) than the first bonding portion (28), At least one film member (60) is held within the tubular portion (25); The element mounting portion (23) has a part of the hollow woven portion (25) and a tape extension portion (24) extending from the first weaving portion (28) of the hollow woven portion (25) and formed by single weaving. A fastener stringer characterized by the above.

2. 2. The fastener stringer according to claim 1, wherein the tape extension (24) includes two or more warp threads (31).

3. The fastener element (40) is sewn to the element mounting portion (23) by double chain stitching with the sewing thread (50) including two needle threads (51), One of the needle threads (51) has a portion that passes through the fastener tape (20) and the film member (60), The other needle thread (51) has a portion that passes through the fastener tape (20) without passing through the film member (60). The fastener stringer according to claim 1.

4. When the film member (60) is divided into three regions having equal width dimensions in the cross-sectional view of the fastener stringer (10): an outer region close to the tape extension portion (24), a central region including the central portion in the width direction of the film member (60), and an inner region away from the tape extension portion (24), one of the needle threads (51) penetrates the film member (60) in the region including the outer region and the central region of the film member (60). The fastener stringer according to claim 3.

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