Fastener stringer for invisible slide fastener

Abstract

The utility model provides zipper tooth chain belts (11A, 11B) for an invisible zipper. The zipper tooth chain belts (11A, 11B) comprise a pair of zipper belts (20A, 20B); and a pair of fastener element rows (30A, 30B) each having a coil-shaped monofilament row (29A, 29B) and a core wire (15). Each element (31) of the fastener element row includes an engaging head portion (32), an upper leg portion (33), a lower leg portion (34), and a connecting portion (35), and a bent portion (38) is formed on the lower leg portion of each element, so that a lower surface (37) of the lower leg portion is formed such that a first lower surface (37a) closer to the connecting portion than the bent portion is closer to the upper leg portion than a second lower surface (37b) closer to the engaging head portion than the bent portion.

Description

Technical Field

[0001] The utility model relates to a zipper chain tape for an invisible zipper. Background Art

[0002] Invisible zippers can be concealed in a way that the meshing left and right zipper elements cannot be seen from the outside, and have the advantage of not hindering the design of the product. Therefore, they are suitable for various products such as clothing and shoes. In recent years, they are also used in seat covers for cars and trains.

[0003] like Fig.15 As shown, the invisible zipper is formed by bending the opposite side edges of a pair of left and right zipper tapes 202, 202 along the length direction into a U-shaped cross section, and sewing the zipper teeth 204, 204 and the core wires 206, 206 together with the sewing lines 205, 205 along the outer surface of the U-shaped folded parts 203, 203. Moreover, when the zipper teeth 204, 204 of the two zipper tapes are meshed with each other, the zipper teeth 204, 204 are not visible from the outside of the zipper tapes 202, 202 (for example, refer to Patent Document 1).

[0004] In addition, in the invisible zipper described in Patent Document 2, Fig.16 As shown, it is known that a fastener element 210 constituting a coil-shaped fastener element row uses a fastener element formed in a so-called racket shape having a step 211 at a leg portion.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: International Publication No. 2015 / 151167

[0008] Patent Document 2: Taiwan Utility Model Publication No. 248284 Utility Model Content

[0009] However, in Fig.15 In the invisible zipper having the zipper teeth rows 204, 204 with the teeth in an oblong shape, when the slider is twisted and pulled upward, the monofilament portion of the teeth may move relative to the sewing line in the tape width direction, resulting in the teeth collapsing and being unable to engage with the teeth on the opposite side. In particular, in the invisible zipper, since the zipper tapes 202, 202 are folded back, a torsional force is easily applied to the teeth when the slider is pulled upward. Moreover, when the invisible zipper is used for women's clothing, etc., such collapse of the teeth will cause a big problem.

[0010] In addition, when using Fig.16In the case of the link element 210 shown, since it is a structure without a core wire, the position of the sewing line is easily offset relative to the link element 210. When the zipper tape is pulled toward the connecting portion side (the side of the link element opposite to the engaging head is called the connecting portion), the position of the sewing line is offset and the isolation member opens, which may cause the zipper link element row to be visible between the left and right zipper tapes.

[0011] The utility model is completed in view of the above situation, and its purpose is to provide a zipper chain tape for invisible slide fastener, which can suppress the movement of the monofilament part of the chain element in the width direction of the tape by sewing thread, prevent the collapse of the chain element, and ensure the concealment of the chain element.

[0012] The above-mentioned object of the utility model is achieved through the following structure.

[0013] (1) A zipper chain tape for an invisible zipper, comprising: a pair of zipper tapes, one side edge of which is folded back into a U-shape and faces each other; and a pair of zipper chain element rows, each of which comprises: a coiled monofilament row, which is sewn by sewing thread to a folded back portion formed by sewing one side edge of the pair of zipper tapes; and a core thread, which is inserted into an internal space formed in the coiled monofilament row along the length direction of the tape and is sewn by the sewing thread to be fixed to the coiled monofilament row, each chain element of the zipper chain element row comprises: a meshing head; and an upper foot portion, which extends from one end of the meshing head in the width direction of the tape, and contacts the folding portion; a lower foot portion, which extends in the belt width direction from the other end portion of the engaging head in a manner separated from the upper foot portion; and a connecting portion, which connects the lower foot portion and the upper foot portion of another adjacent chain tooth, and each chain tooth is formed by forming a bending portion in the lower foot portion, dividing the lower surface of the lower foot portion into a first lower surface and a second lower surface, the first lower surface is located on the connecting portion side compared with the bending portion, and the second lower surface is located on the engaging head side compared with the bending portion, and the first lower surface is closer to the upper foot portion than the second lower surface.

[0014] (2) In the zipper chain tape for the invisible zipper described in (1), the second lower surface of the lower leg portion has an inclined surface from the bending portion toward the engaging head side, and the sewing line wound on the first lower surface of the lower leg portion near the engaging head also contacts the inclined surface of the second lower surface.

[0015] (3) In the fastener stringer for a hidden slide fastener described in (2), the inclination angle of the inclined surface is set to be 40° or less.

[0016] (4) In the fastener stringer for a hidden slide fastener according to (2) or (3), a width dimension of the inclined surface in the tape width direction is 5% or more of a width dimension of the fastener element.

[0017] (5) In the zipper chain tape for an invisible zipper described in any one of (1) to (4), the height dimension of the chain element is 40% to 60% relative to the width dimension of the chain element, and the length of the upper foot portion in the belt width direction within the range of 5% of the height dimension of the chain element from the upper surface of the upper foot portion is greater than 60% relative to the width dimension of the chain element.

[0018] Utility Model Effect

[0019] According to the utility model, the movement of the monofilament part of the fastener element in the tape width direction can be suppressed by the sewing thread, the collapse of the fastener element can be prevented, and the concealment of the fastener element can be ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a top view which looked at the concealed slide fastener which concerns on this embodiment from the front side.

[0021] Figure 2 Observed from the back Figure 1 Top view of the invisible zipper.

[0022] Figure 3 This is a top view of a single-sided zipper tape in an invisible zipper as viewed from the back.

[0023] Figure 4 This is a cross-sectional view showing the fastener stringer in a meshed state, viewed from the rear end side of the slider.

[0024] Figure 5 This is a cross-sectional view showing a single-side zipper stringer.

[0025] Figure 6 It is a cross-sectional view of the fastener element of the coil-shaped fastener element row.

[0026] Figure 7 It is an overall schematic diagram schematically showing an example of a manufacturing apparatus for a coil-shaped fastener element row.

[0027] Figure 8 It is a plan view schematically showing an example of a fastener element forming section of the manufacturing apparatus.

[0028] Fig. 9 It is a side view partially showing the arrangement of a pair of screws suitable for a production device.

[0029] Fig.10 It is a cross-sectional view which shows the example of the conveyance form of the coil-shaped fastener element row by a manufacturing apparatus.

[0030] Fig.11 It is a cross-sectional view showing an example of component arrangement of a meshing head forming portion of a manufacturing apparatus.

[0031] Fig.12 It is a cross-sectional view showing an example of component arrangement of a lower leg forming section of a manufacturing apparatus.

[0032] Fig.13 It is a front view of a pressing roller suitable for engaging the head forming portion.

[0033] Fig.14 This is a front view of a rotary hammer suitable for the lower leg forming section.

[0034] Fig.15 This is a cross-sectional view showing a conventional invisible zipper.

[0035] Fig.16 It is a front view showing a conventional racket-type fastener element.

[0036] Description of Reference Numerals

[0037] 1 Invisible zipper

[0038] 4 Slider

[0039] 5 Slider body

[0040] 6 Pull Tab

[0041] 11A, 11B zipper chain

[0042] 15 core wire

[0043] 20A, 20B zipper tape

[0044] 22 Turnaround

[0045] 29A, 29B coil-shaped monofilament array

[0046] 30A, 30B zipper chain teeth

[0047] 31 Zipper teeth

[0048] 38 Bending part

[0049] 40 bevel

[0050] A Chain tooth height

[0051] B: The length of the upper leg portion in the tape width direction within the range of the height dimension C which is 5% of the height dimension of the fastener element from the upper surface of the upper leg portion.

[0052] D Width of chain teeth

[0053] W1 Width of the slope

[0054] θ Angle of the inclined plane DETAILED DESCRIPTION

[0055] Hereinafter, one embodiment of the hidden slide fastener including the fastener tape for a hidden slide fastener according to the present invention will be described in detail based on the drawings.

[0056] In addition, in the subsequent description, the front-to-back direction refers to the length direction of the zipper tape parallel to the sliding direction of the slider, especially the direction in which the slider slides so as to engage the left and right zipper chain teeth (closing direction) is set to the front, and the direction in which the slider slides so as to separate the left and right zipper chain teeth (separation direction) is set to the rear.

[0057] The left-right direction refers to the tape width direction of the fastener tape, and is, for example, a direction perpendicular to the sliding direction of the slider and parallel to the surface (upper surface) and the back surface (lower surface) of the fastener tape.

[0058] In addition, the up-down direction refers to a direction orthogonal to the front-back direction and the left-right direction, for example, it refers to the height direction of the zipper element row orthogonal to the surface (upper surface) and the back (lower surface) of the zipper tape. In particular, in the following embodiments, the direction of the side on which the zipper tape is attached relative to the zipper element row is set as the upper side, and the direction on the opposite side is set as the lower side.

[0059] Figure 1 This is a top view of the invisible slide fastener according to the present embodiment as viewed from the front side. Figure 2 Observed from the back Figure 1 A top view of the invisible zipper. Figure 3 This is a plan view of the fastener stringer on one side of the invisible slide fastener as seen from the back side.

[0060] like Figure 1 and Figure 2 As shown, the invisible zipper 1 of this embodiment includes: a pair of left and right zipper tapes 11A and 11B, which are respectively sewn with zipper teeth 30A and 30B on the left and right zipper tapes 20A and 20B; and a slider 4, which can slide along the zipper teeth 30A and 30B formed on each zipper tape 11A and 11B. The invisible zipper 1 has the left and right zipper teeth 30A and 30B that mesh with the zipper tapes 11A and 11B that cannot be seen from the outside (refer to Figure 2 ) in a concealed manner.

[0061] The slider 4 for the invisible zipper includes a slider body 5 and a pull tab 6 mounted on the surface of the slider body 5. By moving the slider 4 forward, the left and right zipper tooth rows 30A and 30B are engaged, and by moving the slider 4 backward, the left and right zipper tooth rows 30A and 30B are separated.

[0062] A pair of zipper chain tapes 11A, 11B include: a pair of zipper tapes 20A, 20B, whose side edges facing each other are folded back into a U shape along the length direction of the tapes; and a pair of coil-shaped zipper chain teeth 30A, 30B, which are sewn to the folded back portion 22 formed by the folded back side edge of the pair of zipper tapes 20A, 20B by double-thread lock stitching with sewing thread 12.

[0063] Specifically, a pair of zipper element rows 30A, 30B respectively include: a coil-shaped continuous monofilament row 29A, 29B, which is sewn by the sewing thread 12 to the folded back portion 22 formed by the side edge of each zipper tape 20A, 20B; and a core thread 15, which is inserted into the inner space formed in each coil-shaped continuous monofilament row 29A, 29B along the tape length direction, and is sewn by the sewing thread 12 and fixed to the coil-shaped monofilament row 29A, 29B (refer to Figure 3 ).

[0064] The fastener element rows 30A and 30B are formed by winding a monofilament made of a synthetic resin such as polyamide or polyester in a certain direction to form a coil-shaped monofilament row 29A and 29B, thereby having a plurality of fastener elements 31 (hereinafter also referred to as "elements 31"). Figure 5 and Figure 6 As shown, each chain element 31 constituting the zipper chain element array 30A, 30B includes: an engaging head 32; an upper leg portion 33, which extends in the tape width direction from one end of the engaging head 32 and contacts the return portion 22; a lower leg portion 34, which extends in the tape width direction from the other end of the engaging head 32 in a manner separated from the upper leg portion 33; and a connecting portion 35, which connects the lower leg portion 34 and the upper leg portion 33 of another adjacent chain element 31.

[0065] In addition, each fastener element 31 is provided with a bent portion 38 at the lower leg portion 34 as described later, so that the lower surface of the lower leg portion 34 closer to the connecting portion 35 than the bent portion 38 (i.e., the first lower surface 37a of the lower leg portion 34) is closer to the upper leg portion 33 side (refer to Figure 6 ), formed into a so-called racket shape.

[0066] like Figure 5 As shown, the sewing line 12 includes: two upper lines 13, which pass through the folding portion 22 of the zipper tapes 20A and 20B; and a lower line 14, which contacts the lower surface of the lower foot portion 34 of each chain element 31 of the zipper chain element row 30A and 30B, presses the lower foot portion 34 toward the zipper tapes 20A and 20B, and forms a loop with the upper line 13.

[0067] In addition, the lower thread 14 is a single thread, but it appears to be three threads because it crosses the lower leg portion 34 of each element 31 three times. Therefore, the fastener element rows 30A and 30B are sewn to the fastener tapes 20A and 20B by one sewing process using one lower thread 14 and two upper threads 13. In addition, the core thread 15 is fixed to the monofilament rows 29A and 29B by sewing the sewing thread 12.

[0068] The meshing head 32 of the fastener element 31 is formed to extend in the up-down direction, and a front and rear bulge that bulges forward and backward is provided in the central part in the up-down direction. The bulge of the meshing head 32 is formed to enter between the meshing heads 32 of the fastener element rows 30A and 30B of the meshing counterpart, so that the meshing heads 32 of the fastener element rows 30A and 30B mesh with each other.

[0069] exist Figure 6 In the front view of the fastener element 31 shown, the upper leg portion 33 is formed in a straight line along the tape width direction so as to contact the folded portion 22 of the fastener tapes 20A, 20B, or is formed in a substantially straight line shape bent so that the center portion in the tape width direction bulges slightly upward.

[0070] In addition, in the present embodiment, it is preferred that the upper leg portion 33 is formed into a substantially straight shape that is curved in such a manner that the central portion in the tape width direction bulges slightly upward, and the tape width direction length B of the substantially straight upper leg portion 33 within the range of the height dimension C that is 5% of the height dimension A of the fastener element 31 from the upper surface of the upper leg portion 33 is designed to be 60% or more of the width dimension D of the fastener element, and the reason for this will be described later. In addition, the height dimension A of the fastener element 31 is the dimension from the highest position of the central portion of the upper leg portion 33 to the lowest position of the lower leg portion 34 when the fastener element rows 30A, 30B are sewn to the fastener tapes 20A, 20B. In addition, the width dimension D of the link element 31 is the dimension in the tape width direction from the link element end edge arranged on the outermost side of the tape in the connecting portion 35 of the link element 31 to the link element end edge arranged on the innermost side of the tape in the engaging head 32 in the main view of the link element 31 when the zipper link element rows 30A and 30B are sewn to the zipper tapes 20A and 20B.

[0071] In the front view of the fastener element 31, the lower leg portion 34 includes: an upper surface 36 facing the upper leg portion 33, and a lower surface 37 disposed on the side exposed to the outside on the opposite side of the upper surface 36. The upper surface 36 of the lower leg portion 34 includes: a first upper surface 36a, which is inclined toward the engagement head 32 in a manner away from the upper surface of the zipper tape 20A, 20B; and a second upper surface 36b, which is inclined toward the engagement head 32 in a manner close to the upper surface of the zipper tape. Thus, a bent boundary portion 36c is provided between the first upper surface 36a and the second upper surface 36b. In addition, the first upper surface 36a near the boundary portion 36c is convexly curved in a manner that is slightly bulged toward the upper surface of the zipper tape 20A, 20B.

[0072] The lower surface 37 of the lower leg portion 34 includes: a first lower surface 37a, which is continuously arranged from the connecting portion 35; a second lower surface 37b, which extends from the first lower surface 37a toward the meshing head 32 via the bending portion 38 and is inclined downward; and a third lower surface 37c, which is inclined upward toward the meshing head 32 from the lowest part of the second lower surface 37b.

[0073] The first lower surface 37a of the lower leg portion 34 is configured to be smoothly continuous with the curved lower surface of the connecting portion 35 without forming a step, and in the main view of the zipper chain element, it is straight along the tape width direction parallel to the upper surface of the zipper tape 20A, 20B toward the engaging head 32 to the bent portion 38, or it is gently inclined downward in a manner gradually away from the zipper tape 20A, 20B.

[0074] That is, it is preferable that the inclination angle of the first lower surface 37a of the lower leg portion 34 from the bent portion 38 toward the connecting portion 35 side is set to 0° or more and 10° or less with respect to the tape upper surface of the fastener tapes 20A, 20B.

[0075] By setting the inclination angle of the first lower surface 37a to be between 0° and 10°, the sewing thread 12 (lower thread 14) mounted on the first lower surface 37a can be brought into contact with the first lower surface 37a and thus stably placed on the first lower surface 37a. In addition, it is easy to ensure that the height dimension H of the bending portion 38 provided between the lowest portion of the second lower surface 37b and the position of the first lower surface 37a (bending portion 38) is large as described later.

[0076] The second lower surface 37 b of the lower leg portion 34 is formed to have a larger inclination angle than the first lower surface 37 a of the lower leg portion 34 via the bent portion 38 in the front view of the fastener element, and is formed to be slightly curved convexly upward while decreasing the inclination angle toward the engaging head 32 .

[0077] In this case, the bent portion 38 of the lower leg portion 34 is a portion where the inclination angle of the lower surface 37 of the lower leg portion 34 is partially changed, and such a bent portion 38 is formed by pressing the first lower surface 37a of the lower leg portion 34 in the forming process of forming the linear monofilament into the coil-shaped fastener element 31 in the manufacturing device described later. In addition, by such forming, a short inclined surface 40 inclined relative to the length direction of the belt is formed on the second lower surface 37b of the lower leg portion 34 from the bent portion 38 toward the meshing head side.

[0078] In addition, in this embodiment, if Figure 5 As shown, among the lower threads 14 arranged at three locations on the first lower surface 37a, the lower thread 14 close to the meshing head also contacts the inclined surface 40 of the second lower surface 37b. That is, the lower thread 14 close to the meshing head can cross and be wound between the inclined surfaces 40 of the first lower surface 37a and the second lower surface 37b. As a result, a part of the lower thread 14 wound on the inclined surface 40 can make the pressing force act on the fastener element 31 obliquely via the lower leg portion 34, and when the fastener element 31 is pressed toward the inner side of the zipper tape 20A, 20B (that is, the pressing force from the meshing head 32 toward the connecting portion 35), the collapse of the fastener element 31 moving relative to the sewing line 12 can be suppressed.

[0079] like Figure 5 or Figure 6 As shown, the bend portion 38 of the present embodiment is formed so that the inclination angle θ of the inclined surface in the second lower surface 37b is larger than the above-mentioned inclination angle of the first lower surface 37a (particularly, the inclination angle of the portion near the bend portion 38 in the first lower surface 37a). On the other hand, the inclination angle θ of the inclined surface 40 is set to be less than 40° so that the lower line 14 near the engaging head can be stably contacted. Here, in the front view of the zipper element, the inclination angle θ refers to the angle between the imaginary plane extending from the bend portion 38 toward the engaging head 32 side in a direction parallel to the tape upper surface of the zipper tape 20A, 20B and the inclined surface 40 in the second lower surface 37b. In addition, the inclined surface 40 in the second lower surface 37b refers to the surface of the portion directly extending from the bend portion 38 of the second lower surface 37b, and the inclination angle θ in the case where the portion near the bend portion 38 is formed as a curved surface refers to the angle at which the tangent line of the curved surface is inclined relative to the tape upper surface of the zipper tape 20A, 20B.

[0080] On the other hand, it is preferable that the inclination angle θ of the inclined surface 40 of the second lower surface 37 b with respect to the tape upper surface of the fastener tapes 20A, 20B is 10° or more.

[0081] However, the inclination angle θ of the slope 40 of the second lower surface 37b with respect to the tape upper surface of the fastener tapes 20A, 20B is different from the inclination angle of the first lower surface 37a of the lower leg portion 34 from the above-mentioned bent portion 38 toward the connecting portion 35 side.

[0082] In this way, the inclination angle θ of the second lower surface 37b is set as described above relative to the upper surface of the zipper tapes 20A, 20B and the first lower surface 37a of the lower leg portion 34, so that when the chain element 31 is subjected to a pressing force toward the inner side of the zipper tapes 20A, 20B (i.e., a pressing force from the engaging head 32 toward the connecting portion 35), it is difficult for the sewing thread 12 to slide on the second lower surface 37b of the lower leg portion 34 and thus flip over when, for example, the invisible zipper 1 is twisted.

[0083] Furthermore, it is preferred that the width dimension W1 of the inclined surface 40 in the tape width direction is 5% or more of the width dimension D of the fastener element 31 so that the lower wire 14 near the engagement head can stably contact the inclined surface 40. On the other hand, based on the relationship with the size of the height dimension H of the second lower surface 37b, the width dimension W1 of the inclined surface 40 is preferably 20% or less.

[0084] In addition, in the present embodiment, the bending portion 38 serving as the boundary between the first lower surface 37a and the second lower surface 37b of the lower foot portion 34 and the boundary portion 36c between the first upper surface 36a and the second upper surface 36b of the lower foot portion 34 are arranged at different positions in the belt width direction, and the boundary portion 36c of the upper surface 36 is arranged at a position close to the meshing head 32 in the belt width direction (a position offset toward the meshing head 32 side) relative to the bending portion 38 of the lower surface 37.

[0085] Thus, since the core thread 15 is held in close contact between the lower surface of the upper leg portion 33 and the first upper surface 36a of the lower leg portion 34, the movement of the core thread 15 is suppressed, and the movement of the sewing thread 12 that fixes the core thread 15 can also be suppressed. In particular, since the first upper surface 36a of the lower leg portion 34 is convexly curved at a position close to the boundary portion 36c, the friction between the core thread 15 and the fastener element 31 is increased, and the movement of the core thread 15 and the sewing thread 12 can be further suppressed.

[0086] In addition, the core wire 15 protrudes toward the engaging head 32 side compared with the bending portion 38 in the tape width direction. Therefore, when the slider 4 is slid to engage the left and right zipper chain tooth rows 30A and 30B, the left and right zipper tapes 20A and 20B are butted against each other, and the core wire 15 inserted in the monofilament portion of the chain element 31 abuts against the engaging head 32 of the zipper chain tooth row 30A and 30B on the opposite side. The core wire 15 can play an appropriate buffering role and can stably maintain the left and right zipper tapes 20A and 20B in a state of being butted against each other.

[0087] Further, in this embodiment, if Figure 6 As shown, the height dimension H of the second lower surface 37b provided from the height position of the lowermost surface of the second lower surface 37b of the fastener element 31 to the height position of the bent portion 38 is set to 5% to 20% of the overall height dimension A of the fastener element 31.

[0088] By making the height dimension H of the second lower surface 37b more than 5% of the overall height dimension A of the fastener element 31, even if the fastener element 31 is pressed toward the inner side of the fastener tapes 20A and 20B, the lower leg portion 34 can be reliably and stably pressed by the sewing thread 12. Thus, the movement of the fastener element 31 in the tape width direction can be restricted, and the sewing thread 12 can be prevented from relatively climbing over the lowermost surface of the second lower surface 37b of the lower leg portion 34.

[0089] In addition, in the case of the present embodiment, as described later, by setting the ratio of the belt height dimension A to the belt width dimension A / D×100 (%) to 40% to 60%, it is easy to ensure that the height dimension H of the second lower surface 37b is greater than 5% of the overall height dimension A of the chain element 31.

[0090] According to the fastener tapes 11A and 11B for the invisible slide fastener of the present embodiment, even when the slider 4 is twisted and pulled upward, the sewing thread 12 and the chain element 31 are unlikely to be relatively displaced in the tape width direction, and the collapse of the chain element can be prevented, thereby ensuring the performance of the invisible slide fastener 1. In addition, since the sewing thread 12 and the monofilament portion of the chain element 31 are unlikely to be relatively displaced in the tape width direction, the opening of the isolation member can be suppressed, and the concealment of the chain element 31 can be ensured.

[0091] Furthermore, when manufacturing the zipper tapes 11A and 11B for invisible zippers, the position of the core thread 15 is easily moved relatively because the zipper tapes 11A and 11B on one side are sewn one by one. However, by setting the zipper teeth rows 30A and 30B in a racket shape, it is expected that the position of the sewing line 12 is stabilized, thereby improving the yield rate of the zipper tapes 11A and 11B. In addition, by setting the zipper teeth rows 30A and 30B in a racket shape, it is also possible to prevent the wear of the sewing line 12.

[0092] In addition, in the invisible zipper 1 of the above-mentioned embodiment, the fastener element 31 is fixed to the zipper tapes 20A and 20B by the sewing line 12 formed by double-thread lock stitching including two upper threads 13 and one lower thread 14. However, in the present invention, the form of the sewing portion that fixes the fastener element is not particularly limited as long as a part of the sewing line 12 is in contact with the above-mentioned first lower surface 37a of the fastener element.

[0093] Next, refer to Figure 7 to Figure 14 A manufacturing apparatus for manufacturing the above-mentioned coil-shaped fastener element rows 30A and 30B will be described.

[0094] Figure 7 1 is a diagram schematically showing the overall structure of a manufacturing device for a coil-shaped fastener element row of a fastener stringer for a hidden fastener according to the present embodiment. Figure 7 As shown, the manufacturing device of the coil-shaped zipper chain element array of the present embodiment includes: a monofilament supplying section 101; a winding section 105, which is used to insert the core wire 15 into the center part while winding the monofilament 8 in a coil shape on the core shaft 121; and a chain element forming section 106, which forms the meshing head and upper and lower legs of the chain element in a prescribed shape on the monofilament 8 wound on the core shaft 121.

[0095] The monofilament supply section 101 includes: a large bobbin 108 on which the monofilament 8 is wound, and the bobbin is vertically mounted and fixed on the bottom surface 107; a winglet 109, which is supported on the upper end of the bobbin of the bobbin 108 in a manner that allows it to rotate freely in a horizontal plane with the winding core as the center, and guides the monofilament 8 unwound from the bobbin 108 to the axis of the winding core; and a guide roller 110, which is arranged above the bobbin to convert the direction of the monofilament 8 pulled vertically upward into a horizontal direction.

[0096] The winding section 105 includes: a base 111; a hollow square frame 112, which is arranged above the base 111; a pair of rotating bodies 113, 114, which have monofilament guide holes 113a, 114a arranged on the outer wall surfaces of the front and rear walls of the frame 112 so as to rotate synchronously with each other; monofilament guide bodies 115, 116, which are located on the inner wall surfaces of the front and rear walls of the frame 112 and rotate integrally with the rotating bodies 113, 114; a core wire reel 117, which is freely loadable and removable. The core wire 15 is fixed to the axis of the rear monofilament guide body 116 in a manner; the core wire pulling body 118 is freely rotatable so as to guide the core wire 15 pulled out from the core wire reel 117 to the hollow axis of the front monofilament guide body 115 and the front rotating body 113; the guide support 119 is vertically arranged between the above-mentioned guide roller 110 and the frame 112; the core shaft frame 120 is fixed to the axis of the front rotating body 113; and the rod-shaped core shaft 121 extends horizontally from the core shaft frame 120 toward the front.

[0097] The front and rear rotating bodies 113 and 114 are driven by a driving source not shown in the figure to rotate synchronously with each other. A guide hole 119a for guiding the monofilament 8 is formed at the upper end of the guide pillar 119, and monofilament guide holes 115a and 116a are formed at the opposite outer peripheral ends of the front and rear monofilament guide bodies 115 and 116, which are connected to the monofilament guide holes 113a and 114a, respectively. The monofilament guide holes 113a and 114a are respectively provided in the front and rear rotating bodies 113 and 114. Moreover, by the rotation of the front and rear rotating bodies 113 and 114, the monofilament 8 is sent out from the bobbin 108 on the one hand, and is continuously wound around the core shaft 121 in a coil shape on the other hand. The position of the monofilament guide hole 119a formed at the upper end of the guide pillar 119 is substantially on the central axis of the core shaft 121. In addition, a core wire guide groove 121a (see FIG. 121 ) is formed over the entire length of the core shaft 121 to fit the core wire 15 and guide the core wire 15 to slide. Fig.10 ).

[0098] Further, if Fig. 9 As shown, an auxiliary mandrel 121 b is provided at the base end of a mandrel 121 extending from a mandrel holder 120 , and the amount of the monofilament 8 wound around the mandrel 121 can be adjusted by the size of the auxiliary mandrel 121 b .

[0099] Figure 8 The fastener element forming section 106 is schematically shown. The fastener element forming section 106 includes a pair of screws 122 (see Fig. 9 ), which are arranged on the left and right across the mandrel 121; the meshing head forming part 123, which are arranged on the upper and lower sides across the base end side of the mandrel 121; the lower leg forming part 124, which is arranged so that the circumference is inclined in the direction of crossing the meshing head forming part 123 at the top end side portion close to the center of the mandrel 121, so that the lower leg 34 of the coupling element 31 is bent and deformed in a step-like manner. In addition, for the screw 122 arranged on the side where the lower leg forming part 124 is arranged in the left and right pair of the screws 122, the screw part is missing in a manner that the screw shaft 122a remains so as not to interfere with the lower leg forming part 124.

[0100] The core shaft 121 is formed between the base end portion thereof and the lower leg forming portion 124. Fig.10 and Fig.11 As shown in FIG. 1 , the core wire guide groove 121a including the rectangular shape is formed as a substantially rectangular cross section, and the subsequent parts including the part where the lower leg forming part 124 is arranged are as follows. Fig.12 As shown, it is formed to form a substantially L-shaped cross section. According to the example shown in the figure, the core wire guide groove 121a is formed on the surface on the opposite side of the bending surface of the core shaft portion forming the substantially L-shaped cross section.

[0101] The engaging head forming part 123 includes a die 123a, which is as follows: Fig.11 As shown, it is arranged above the core shaft 121; and the meshing head forming circular plate 123b is a pressing roller for the meshing head arranged below the core shaft 121, and a holding space for the connecting portion 35 of the chain element 31 and a forming space for the meshing head 32 are respectively left between the two and the core shaft 121. The die 123a is fixedly mounted on a supporting frame not shown in the figure, etc., and clamps the connecting portion 35 of the chain element 31 between the core shaft 121, and has sufficient rigidity to withstand the pressing force when the meshing head forming circular plate 123b is used to form the meshing head 32 of the chain element 31. On the other hand, the meshing head forming circular plate 123b is driven to rotate slightly slower than the rotation of the screw 122, with its rotation axis as the center, as shown in FIG. Fig.13 As shown, the outer peripheral surface is alternately formed with arc portions 123b-1 and chord portions 123b-2 in the circumferential direction, and their central angles are set to be the same, but the central angle of the arc portion 123b-1 can be set larger than the central angle of the chord portion 123b-2. In this way, when forming one meshing head 32, the pressing time by the arc portion 123b-1 is increased, and the desired meshing head 32 can be reliably obtained.

[0102] In addition, if the pressing area of ​​the arc portion 123b-1 is set to the minimum required for the forming of the meshing head 32, the center angle is set to be small, and the conveying speed of the coiled wire based on the screw is adjusted to a speed at which multiple arc portions 123b-1 can press the corresponding parts of the meshing head forming multiple times, then the forming of one meshing head 132 will not be completed by one press, but can be completed by multiple presses, thereby forming a meshing head 32 with a stable shape.

[0103] like Fig.12 As shown, the lower leg forming part 124 has a truncated cone-shaped rotary weight 125 fixed to the end of the rotary shaft, and the rotary shaft is arranged to be inclined so that the inclined peripheral surface 125a presses the lower leg 34 of the fastener element 31. Fig.14 As shown, in the inclined circumferential surface 125a, a plane portion 125a-1 and an arcuate surface portion 125a-2 protruding in an arc shape are alternately arranged in the circumferential direction thereof. In the illustrated example, their center angles are set to be the same, but the center angle of the arcuate surface portion 125a-2 can also be set to be larger than the center angle of the plane portion 125a-1 in the same manner as the meshing head forming circular plate 123b. In addition, when the center angle is set to be small while ensuring the minimum area required for press forming, when the lower leg portion 34 is formed, the lower leg portion 34 will not be completely bent and formed by one press, but the final form can be obtained by pressing the required part of the lower leg portion 34 with the arcuate surface portion 124a-2 several times.

[0104] When the shape of the rotary weight 125 is set as described above and its rotation axis is arranged to intersect with the extension of the straight line connecting the centers of the pair of screws at an acute angle, the rotary weight 125 can interfere with only one of the pair of screws. In order to avoid this interference, the screw portion is cut off with the screw shaft portion 122a remaining in the illustrated example. In addition, if the screw groove of the other screw is arranged facing each other on the inclined peripheral surface 125a of the rotary weight 125, the facing screw grooves can reliably bear the pressing force of the rotary weight 125 on the lower leg 34 via the upper leg 33, so that stable leg forming can be performed.

[0105] According to the manufacturing device for continuous chain elements for zippers of the present embodiment having the above structure, while a pair of left and right screws 122 are driven to rotate by a driving device not shown in the figure, the rotating shaft 113 of the winding portion 105, the meshing head forming circular plate 123b of the meshing head forming portion 123 and the conical rotating hammer 125 of the lower foot forming portion 124 start to rotate synchronously.

[0106] The monofilament 8 pulled vertically upward from the bobbin 108 of the monofilament supply unit 101 by this rotation is turned to the horizontal direction via the guide roller 110 and passes through the guide holes of the front and rear rotating bodies 113 and 114 rotating at a high speed, and is wound on the core shaft 121 extending forward. Here, the monofilament 8 pulled vertically upward from the bobbin 108 is slightly twisted in one direction when it is wound on the bobbin 108, but the twist is released when it is pulled vertically upward, and it is almost in a twist-free state when it passes through the guide roller 110 and is wound on the core shaft 121.

[0107] The monofilament 8 wound around the mandrel 121 is conveyed forward in a coil shape at a predetermined pitch by the rotation of the left and right screws 122 arranged along the mandrel 121. During the conveying, the pitch is gradually increased by the screw groove. Fig. 9 As shown in the figure, each element unit is arranged at a desired pitch until a certain conveying distance is passed. In the middle of conveying the coiled monofilament 8, it first reaches the meshing head forming section 123, so that the meshing head 32 is formed according to each element 31 on the coiled monofilament 8 (refer to Fig.11 ).

[0108] Next, the coiled monofilament 8 formed with the meshing head 32 is further conveyed by the screw 122. When it reaches the part where the screw 122 is missing, that is, the lower leg forming part 124, the arc surface part 125a-2 of the truncated cone-shaped rotary hammer 125 repeatedly strikes the part of the lower leg 34 of the chain element 31 near the connecting part 35 in the direction of the upper leg 33 as described above. Fig.12As shown, the lower leg portion 34 is bent and narrowed between the bent portion 38 and the upper leg portion 33 to form the final element form of the coil-shaped element row.

[0109] Thus, according to the utility model, the precise spacing between the chain elements conveyed on the core shaft can be ensured even during high-speed operation, and the meshing head 32 is formed sequentially on each chain element unit in the middle of being conveyed on the core shaft, and the portion of the lower leg 34 on the connecting portion side is bent relative to the upper leg 33 via the bending portion 38 to form a narrow shape, thereby efficiently manufacturing high-quality continuous coil-shaped chain element rows.

[0110] In addition, when the bending portion 38 is formed by the rotary hammer 125, the surrounding material is pulled toward the plastically deformed portion due to the plastic deformation generated in the bending portion 38. As a result, the material moves on the entire chain element 31, and in addition to the collapse of the chain element 31, there is a possibility that the strength of the chain element 31, the sliding resistance of the slider 4, and the like may have a negative impact on the quality of the invisible zipper 1. In particular, since the above-mentioned material movement occurs when the bending portion 38 is formed, it is necessary to increase the amount of material of the monofilament 8 in such a way that the volume of the bending portion 38 is increased while maintaining the density unchanged at all parts of the chain element 31. In order to increase the amount of material input, the winding amount of the monofilament 8 wound on the core shaft 121 and the auxiliary core rod 121b is increased.

[0111] Furthermore, in order to further exert the effect of suppressing the collapse of the fastener element 31, the posture of the fastener element 31 on the fastener tapes 20A and 20B needs to be stabilized. Therefore, the ratio of the tape width direction length B of the upper leg portion 33 to the width direction dimension D of the fastener element 31 needs to be specified.

[0112] Therefore, in this embodiment, in order to form the bending portion 38 and ensure the quality of the above-mentioned invisible zipper 1, the height dimension A of the link element 31 is set to 40% to 60% relative to the width dimension D of the link element 31, and the length B of the upper foot portion 33 in the belt width direction within the range of the height dimension C which is 5% of the height dimension A of the link element 31 from the upper surface of the upper foot portion 33 is set to be greater than 60% and preferably greater than 65% relative to the width dimension D of the link element.

[0113] Here, when the height dimension A of the fastener element 31 is larger than the width dimension D of the fastener element 31 , the fastener element 31 is likely to roll and collapse.

[0114] Furthermore, since the length B of the upper leg portion 33 in the tape width direction needs to be manufactured so as to be bent toward the meshing head side and the connecting portion side, it is preferably 80% or less of the width direction dimension D of the fastener element.

[0115] As described above, according to the fastener tapes 11A and 11B for invisible zippers of the present embodiment, the fastener element rows 30A and 30B are configured to have a racket shape and have the core wire 15 inserted in the inner space formed in the monofilament rows 29A and 29B that are continuous in a coil shape along the tape length direction, so that even when the slider 4 is twisted and pulled upward, the sewing thread 12 and the element 31 are difficult to be relatively displaced in the tape width direction, and the collapse of the element 31 is prevented, thereby ensuring the performance as the invisible zipper 1. In addition, since the sewing thread 12 and the element 31 are difficult to be relatively displaced in the tape width direction, the opening of the isolation member can be suppressed, and the concealment of the element 31 can be ensured.

[0116] In addition, the present invention is not limited to the configuration exemplified in the above-mentioned embodiment, and can be appropriately modified within a range not departing from the gist of the present invention.

[0117] For example, the fastener stringer for invisible zipper of the above embodiment can exert the above effect even in invisible zipper of any size, and the utility model can exert the effect more particularly when used in women's clothing, etc. The width dimension D of the chain element exerts the effect more in small invisible zipper.

[0118] As described above, the present specification discloses the following matters.

[0119] (1) A zipper chain tape for an invisible zipper, comprising: a pair of zipper tapes, one side edge of which is folded back into a U shape; and a pair of zipper chain element rows, each of which has: a coiled monofilament row, which is sewn by sewing thread to the folded back portion of one side edge of each of the zipper tapes; and a core thread, which is inserted into the internal space of the coiled monofilament row along the length direction of the tape and is fixed to the coiled monofilament row by sewing by the sewing thread, each chain element of the zipper chain element row includes: a meshing head; an upper foot portion, which extends from one end of the meshing head in the width direction of the tape, and Contact with the return portion; a lower foot portion, which extends in the belt width direction from the other end portion of the engaging head in a manner separated from the upper foot portion; and a connecting portion, which connects the lower foot portion and the upper foot portion of another adjacent chain tooth, and each chain tooth is formed by forming a bending portion in the lower foot portion, so that the lower surface of the lower foot portion is divided into a first lower surface and a second lower surface, the first lower surface is located on the connecting portion side compared with the bending portion, and the second lower surface is located on the engaging head side compared with the bending portion, and the first lower surface is closer to the upper foot portion than the second lower surface.

[0120] According to this structure, even when the slider is twisted and pulled upward, it is difficult for the sewing thread and the chain element to be relatively displaced in the belt width direction, thereby preventing the chain element from collapsing and ensuring the performance of the invisible zipper. In addition, since it is difficult for the sewing thread and the chain element to be relatively displaced in the belt width direction, it is possible to suppress the opening of the isolation member and ensure the concealment of the chain element.

[0121] (2) In the zipper chain tape for the invisible zipper described in (1), the second lower surface of the lower leg portion has an inclined surface from the bending portion toward the engaging head side, and the sewing line wound on the first lower surface of the lower leg portion near the engaging head also contacts the inclined surface of the second lower surface.

[0122] According to this configuration, the sewing thread wound around the first lower surface of the lower leg portion near the meshing head can cause the pressing force to act on the fastener element at an angle, thereby suppressing collapse of the fastener element due to movement of the fastener element.

[0123] (3) In the fastener stringer for a hidden slide fastener described in (2), the inclination angle of the inclined surface is set to be 40° or less.

[0124] According to this structure, the sewing thread near the engaging head wound on the first lower surface of the lower leg can reliably contact the inclined surface, so the sewing thread can apply pressing force to the fastener element at an angle, thereby suppressing the collapse of the fastener element caused by the movement of the fastener element.

[0125] (4) In the fastener stringer for a hidden slide fastener according to (2) or (3), a width dimension of the inclined surface in the tape width direction is 5% or more of a width dimension of the fastener element.

[0126] According to this configuration, even with a relatively small-sized fastener element, the monofilament portion of the fastener element can be prevented from moving in the tape width direction by the sewing thread wound around the first lower surface of the lower leg portion and in contact with the inclined surface and close to the meshing head.

[0127] (5) In the zipper chain tape for an invisible zipper described in any one of (1) to (4), the height dimension of the chain element is 40% to 60% relative to the width dimension of the chain element, and the length of the upper foot portion in the belt width direction within the range of 5% of the height dimension of the chain element from the upper surface of the upper foot portion is greater than 60% relative to the width dimension of the chain element.

[0128] According to this structure, the bent portion can be formed and the posture of the fastener elements on the fastener tape can be stabilized, and the collapse of the fastener elements can be suppressed, the strength of the fastener elements can be ensured, and the sliding resistance of the slider can be reduced, thereby ensuring the quality of the invisible slide fastener.

Claims

1. A zipper chain tape for an invisible zipper, characterized in that: The zipper chain tape (11A, 11B) for invisible zipper comprises: A pair of zipper tapes (20A, 20B), one side edge of which is folded back into a U shape facing each other; and A pair of zipper element rows (30A, 30B) each comprising: a coiled monofilament row (29A, 29B) sewn by a sewing thread (12) to a folded back portion (22) formed by sewing one side edge of each zipper tape; and a core thread (15) inserted into an internal space formed in the coiled monofilament row along the tape length direction and fixed to the coiled monofilament row by sewing by the sewing thread. Each chain element (31) of the zipper chain element array includes: a meshing head (32); an upper leg (33) extending from one end of the meshing head (32) in the belt width direction and in contact with the folding portion (22); a lower leg (34) extending from the other end of the meshing head (32) in the belt width direction in a manner separated from the upper leg; and a connecting portion (35) connecting the lower leg and the upper leg of another adjacent chain element. Each of the chain elements is formed by forming a bent portion (38) at the lower leg portion, so that the lower surface (37) of the lower leg portion is divided into a first lower surface (37a) and a second lower surface (37b), wherein the first lower surface (37a) is located on the connecting portion side compared to the bent portion, and the second lower surface (37b) is located on the engaging head side compared to the bent portion, and the first lower surface (37a) is closer to the upper leg portion than the second lower surface (37b). The height dimension (A) of the fastener element is 40% to 60% of the width dimension (D) of the fastener element. The length (B) of the upper leg portion in the belt width direction within the range of a height dimension (C) that is 5% of a height dimension (A) of the link element from the upper surface of the upper leg portion is greater than 60% of a width dimension (D) of the link element.

2. The zipper stringer for invisible zipper according to claim 1, characterized in that: The second lower surface of the lower leg portion has an inclined surface (40) from the bent portion toward the engaging head side. The sewing thread wound on the first lower surface of the lower leg portion near the engaging head also contacts the inclined surface of the second lower surface.

3. The zipper stringer for invisible zipper according to claim 2, characterized in that: The inclination angle (θ) of the inclined surface is set to be 40° or less.

4. The zipper stringer for invisible zipper according to claim 2, characterized in that: A width dimension (W1) of the inclined surface in the tape width direction is 5% or more of a width dimension (D) of the fastener element.

5. The zipper stringer for invisible zipper according to claim 3, characterized in that: A width dimension (W1) of the inclined surface in the tape width direction is 5% or more of a width dimension (D) of the fastener element.

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