Patent Publication Number: US-2013232737-A1

Title: Fastener Stringer and Slide Fastener

Description:
TECHNICAL FIELD 
     The invention relates to a slide fastener attached to seat covers, for example, for automobile seats and seat covers for sofas, and in particular, to a slide fastener configured to prevent floating or sinking of a fastener tape even when the slide fastener is curved in a tape width direction of the fastener tape. 
     BACKGROUND ART 
     Conventional slide fasteners are broadly classified into two types, a standard-type slide fastener and a concealed-type slide fastener. The standard-type slide fastener is configured such that a fastener element is attached to opposing element attaching portions of a pair of fastener tapes in a state where a coupling head of the fastener element protrudes outward from a tape side end edge at the element attaching portion. In such a standard-type slide fastener, generally, a state where at least a part of the fastener element is exposed to the outside when the left and right fastener elements are engaged is created. 
     On the other hand, the concealed-type slide fastener (hereinafter, referred to simply as a concealed slide fastener) is configured such that the fastener element is concealed so as not to be visible from the outside when the left and right fastener elements are engaged. In recent years, the concealed slide fastener is often used in the field of clothes, shoes, and the like from the perspective of design. 
     An example of such a concealed slide fastener is disclosed in JP 2008-119076 A (Patent Document 1), for example. As illustrated in  FIG. 9 , a concealed slide fastener  80  disclosed in Patent Document 1 is a so-called woven-type concealed slide fastener  80  configured such that a fastener element  83  is attached to a fastener tape  82  simultaneously with weaving of the fastener tape  82 . 
     More specifically, the concealed slide fastener  80  of Patent Document 1 includes a pair of left and right fastener stringers  81  and a slider (not illustrated). Moreover, each of the left and right fastener stringers  81  includes a pair of left and right woven band-shaped fastener tapes  82  and a coil-shaped fastener element  83  woven into the fastener tapes  82 . 
     The fastener tape  82  includes a tape body portion  82   a  sewn to be attached to a fastener-attached product such as clothes, a tape bent portion  82   b  that extends in a tape width direction from one side edge of the tape body portion  82   a  and is bent in a U-shape, and an element attaching portion  82   c  which extends further from the tape bent portion  82   b  and to which the fastener element  83  is woven. 
     The fastener element  83  is formed in a continuous shape by molding a monofilament made of a synthetic resin in a coil shape. The fastener element  83  includes a swollen coupling head  83   a  formed by pressing the monofilament at a predetermined interval, upper and lower leg portions  83   b  and  83   c  that extend in the tape width direction from the coupling head  83   a , and a connecting portion  83   d  that connects the adjacent fastener elements  83 . 
     In this case, the fastener element  83  is attached to the fastener tape  82  by weaving the upper and lower leg portions  83   b  and  83   c  into the element attaching portion  82   c  simultaneously with weaving of the fastener tape  82  in a state where the coupling head  83   a  faces the inner side of the fastener tape  82 . Further, after weaving the fastener tape  82 , thermosetting is performed in a state where the fastener tape  82  is bent in a U-shape in the region of the tape bent portion  82   b  so that the coupling head  83   a  of the fastener element  83  protrudes outward from the tape bent portion  82   b . In this manner, the fastener stringer  81  is manufactured. And, when the obtained fastener stringers  81  are combined as two in one set, the concealed slide fastener  80  illustrated in  FIG. 9  is obtained. 
     In the fastener stringer  81  disclosed in Patent Document 1 in particular, a plurality of upper and lower fixing warp threads  84   a  and  84   b  that pass over the outer surfaces of the upper and lower leg portions  83   b  and  83   c  of the fastener element  83  and a plurality of fastening warp threads  84   c  that intersect each other between the upper and lower leg portions  83   b  and  83   c  of the element and pass in a warp direction so as to alternately stride over the upper leg portion  83   b  and the lower leg portion  83   c  are disposed in the element attaching portion  82   c  of the fastener tape  82 . Moreover, a total fineness of a lower fixing warp thread  84   b  that passes on a side closer to the coupling head  83   a  of the element than the fastening warp thread  84   c  among the plurality of lower fixing warp threads  84   b  is higher than a total fineness of the upper fixing warp thread  84   a  that passes on side closer to the coupling head  83   a  than the fastening warp thread  84   c.    
     In this way, since the plurality of lower fixing warp threads  84   b  that pass on the side closer to the coupling head  83   a  than the fastening warp thread  84   c  is closely disposed, it is possible to prevent a positional shift of the lower fixing warp thread  84   b  even when the concealed slide fastener  80  receives a strong lateral pulling force in such a direction as to separate the left and right fastener tapes  82  in a state where the left and right fastener elements  83  are engaged. Thus, it is possible to effectively prevent formation of a gap between the tape bent portions  82   b  of the left and right fastener tapes  82  and to maintain an excellent concealing property of the concealed slide fastener  80 . 
     PRIOR ART DOCUMENT 
     Patent Document 
     
         
         Patent Document 1: JP 2008-119076 A 
       
    
     DISCLOSURE OF THE INVENTION 
     Problem to be Solved by the Invention 
     In recent years, by utilizing the advantages, the concealed slide fastener has been used in various products, for example, seat covers for automobile seats, seat covers for sofas, and the like, as well as various products such as clothes or shoes. Thus, it is desirable that the concealed slide fastener be configured so as to be used in various environments and conditions. 
     For example, when the concealed slide fastener is used for seat covers for automobile seats, the automobile seats are formed of a cushion body that is molded in a predetermined shape and is covered with the seat covers. In this case, depending on the shape or the like of the automobile seats, the concealed slide fastener is attached to the seat covers in a state where the concealed slide fastener is curved in the tape front-rear direction or the tape width direction. Moreover, from the perspective of the design of the automobile seats, the concealed slide fastener is sometimes attached to the seat covers by positively bending the concealed slide fastener in the tape front-rear direction or the tape width direction. 
     Meanwhile, the fastener tape used in the slide fastener is formed by weaving or sewing and is thus generally thin (has a small thickness) in the thickness direction. Moreover, the fastener tape is configured to be wide (has a large width) in the width direction in order to stably sew the slide fastener to the fastener-attached product using a sewing machine. Specifically, in the case of the conventional standard-type slide fastener or concealed slide fastener, for example, the thickness dimension of the fastener tape is set to be 1 mm or smaller. Moreover, the width dimension of the fastener tape is set so that the width dimension of the tape extension portion can have generally a size of 12 mm or more so as to smoothly perform sewing with respect to various fastener-attached products using a sewing machine. 
     Here, the tape extension portion is a tape region that is exposed by being extended outward more than the connecting portion of the fastener element when the fastener stringer is observed from the fastener element side. Since the larger the dimension in the tape width direction of the tape extension portion, the more accurately the fastener tape can be pressed by the foot of the sewing machine when performing sewing using the sewing machine, sewing can be stably performed. 
     As described above, in the conventional slide fastener, the fastener tape is formed to be thin in the thickness direction and wide in the width direction (in particular, so that the tape extension portion can have a size of 10 mm or more). Thus, when the concealed slide fastener, for example, is curved in the tape front-rear direction so as to be attached to a fastener-attached product such as seat covers, since the fastener tape itself can be bent in the thickness direction (front-rear direction) relatively easily, it is possible to neatly sew the concealed slide fastener to the fastener-attached product. 
     In contrast, when the concealed slide fastener, for example, is curved in the tape width direction so as to be attached to a fastener-attached product such as seat covers, when the fastener tape is curved in the tape width direction, a tape extension portion (a tape extension portion curved in a convex shape) that reaches the outer circumference side of the concealed slide fastener may partially float or sink greatly. Moreover, a large wavy wrinkle may be formed in a tape extension portion (a tape extension portion curved in a concave shape) that reaches the inner circumference side of the concealed slide fastener. 
     Thus, when the tape extension portion floats greatly, for example, the fastener tape is not accurately pressed by the foot of the sewing machine. Moreover, when a large wavy wrinkle is formed in the tape extension portion, for example, since the fastener tapes may partially overlap each other, it is difficult to perform sewing on the left and right fastener tapes of the concealed slide fastener using the sewing machine. 
     Moreover, when large floating and sinking or a wavy wrinkle occurs in the sewn fastener tape, the appearance (the quality of external appearance) of the fastener-attached product may deteriorate. Further, when the above-described large floating, sinking, or wavy wrinkle occurs in the fastener tape of the sewn concealed slide fastener, and a slider is slid along an element row, the fastener tape may rub the slider. Thus, the sliding resistance of the slider may increase, and the sliding property of the slider may deteriorate. 
     The invention has been made in view of the problems of the conventional technique, and a specific object of the invention is to provide a fastener stringer, and a slide fastener having the fastener stringer capable of maintaining a fastener tape in an approximately flat form to perform sewing stably when the slide fastener is curved in a tape width direction of a fastener tape so as to be sewn to a fastener-attached product, and preventing the occurrence of partial floating, sinking, or wavy wrinkles in the sewn fastener tape. 
     Means for Solving the Problems 
     In order to attain the object, a fastener stringer for a slide fastener according to the invention includes, as a basic configuration, a fastener tape and a continuous fastener element attached to one side edge portion of the fastener tape, and in which the fastener element includes a coupling head, upper and lower leg portions extending in a tape width direction from the coupling head, and a connecting portion that connects the adjacent fastener elements, and the other side edge portion of the fastener tape extends beyond an edge of the fastener element closer to the connecting portion, being mainly characterized in that: an extension length of the fastener tape in the tape width direction from a position of an end edge at the connecting portion side of the fastener element to a tape end edge of the fastener tape at the other side edge side is restricted to be smaller than 12 mm. 
     In particular, in the invention, it is preferable that the extension length be restricted to 10 mm or smaller and further to 6 mm or smaller. 
     In the fastener stringer according to the invention, it is preferable that the fastener tape be formed of fabrics and include a tape body portion and an element attaching portion disposed at one side edge side of the tape body portion, an ear portion be disposed in the other side edge portion of the tape body portion, and warp threads disposed in the ear portion have tensile strength higher than that of warp threads disposed in portions other than the ear portion of the tape body portion. 
     In this case, it is particularly preferable that four to six warp threads be disposed in the ear portion. 
     Moreover, the fastener stringer of the invention is ideally provided as a fastener stringer in which the fastener tape includes a tape body portion, a tape bent portion extending in the tape width direction from one side edge of the tape body portion so as to be bent in an U-shape, and an element attaching portion which extends further from the tape bent portion and to which the fastener element is attached, and the fastener element is attached to the element attaching portion of the fastener tape in such a manner that the coupling head protrudes outward from the tape bent portion. 
     In particular, the fastener stringer of the invention is further ideally provided as a fastener stringer in which the fastener element is woven into the element attaching portion simultaneously with weaving of the fastener tape. 
     On the other hand, the fastener stringer of the invention is ideally provided as a fastener stringer in which the fastener tape includes a tape body portion and an element attaching portion which extends in the tape width direction from one side edge of the tape body portion and to which the fastener element is attached, and the fastener element is attached to the element attaching portion of the fastener tape in such a manner that the coupling head protrudes outward from a tape side end edge at the element attaching portion side. 
     Further, according to the invention, a slide fastener having the fastener stringer having the above-described configuration is provided. 
     Effect of the Invention 
     The fastener tape of the fastener stringer according to the invention includes the tape extension portion disposed in the other side edge portion of the fastener tape so as to extend beyond the end edge of the fastener element at the connecting portion side. The extension length (that is, the dimension in the tape width direction of the tape extension portion) of the fastener tape in the tape width direction from the position of the end edge at the connection portion side of the fastener element to the tape end edge of the fastener tape at the other side edge side is set to be smaller than 12 mm, and preferably 10 mm or smaller, and particularly preferably 6 mm or smaller. 
     Since the extension length of the fastener tape is restricted to be smaller than 12 mm in this manner, when the fastener stringer is curved in the tape width direction of the fastener tape, it is possible to effectively decrease the magnitude of partial floating and sinking of the tape extension portion of the fastener tape and the magnitude of wavy wrinkling. 
     In particular, the inventor of the invention repeatedly performed various tests and examinations while changing the extension length of the fastener tape and found that it is preferable to restrict the extension length to 10 mm or smaller and further to 6 mm or smaller. That is, if the extension length (the dimension in the tape width direction of the tape extension portion) is 10 mm or smaller, it is possible to decrease the magnitude of floating or sinking of the tape extension portion and the magnitude of wavy wrinkling and to make them less noticeable. 
     Further, if the extension length is 6 mm or smaller, even when the bending (curvature) is increased so that the fastener stringer is curved in the tape width direction, it is possible to maintain the tape extension portion of the fastener tape in an approximately flat form. Thus, even when the fastener stringer is sewn to the fastener-attached product by curving the fastener stringer in the tape width direction of the fastener tape, since sewing can be performed while maintaining the tape extension portion of the fastener tape in an approximately flat form, it is possible to stably perform sewing of the fastener stringer. Further, in this case, since the tape extension portion of the fastener tape is very thin in the tape width direction, it is possible to obtain the effect of reducing the manufacturing cost of the slide fastener and decreasing the weight of the slide fastener. 
     Moreover, in the fastener stringer of the invention, it is possible to prevent the occurrence of partial floating, sinking, or wavy wrinkles in the fastener tape sewn to a fastener-attached product, or to make them small so as not to be noticeable even when partial floating, sinking, or wavy wrinkles occur. Therefore, it is possible to prevent deterioration of the quality of external appearance of the fastener-attached product to which the fastener stringer is sewn and attached. 
     Further, in a slide fastener configured using the fastener stringer, since the slider and the fastener tape rarely rub each other when the slider slides, it is possible to stably secure an excellent sliding property of the slider. 
     In the fastener stringer of the invention, the fastener tape is formed of fabrics, and includes the tape body portion and the element attaching portion disposed on one side edge side of the tape body portion. Moreover, the ear portion is disposed in the other side edge portion of the tape body portion, and the warp threads disposed in the ear portion have tensile strength higher than that of the warp threads disposed in portions other than the ear portion of the tape body portion. 
     In this way, it is possible to stably hold the form of the fastener tape in which the width dimension of the tape extension portion is restricted. Thus, since it is possible to more reliably prevent the occurrence of floating, sinking, or wavy wrinkles in the tape extension portion when the fastener stringer is curved, sewing of the fastener stringer can be more easily performed. Moreover, since the warp threads disposed in the ear portion have high tensile strength, it is possible to stabilize the woven fabrics of the tape body portion on the inner side of the ear portion and to expand the degree of freedom in the choice of woven fabrics employed in the fastener tape. 
     In this case, four to six warp threads are disposed in the ear portion of the fastener tape. Since four or more warp threads are disposed in the ear portion, it is possible to more stably hold the form of the fastener tape. In particular, it is possible to stably bend the weft threads in the ear portion even when the weft threads have strong tensile strength and to stably hold the form of the fastener tape. On the other hand, since six or smaller warp threads are disposed in the ear portion, it is possible to prevent the tensile strength in a portion of the fastener tape at the ear portion side from becoming too strong, to prevent the portion of the fastener tape at the ear portion side from being contracted too much, and to prevent the occurrence of so-called bias in the fastener tape. 
     The invention is ideally applied to a fastener stringer for a so-called concealed slide fastener, in which the fastener tape includes the tape body portion, the tape bent portion extending in the tape width direction from one side edge of the tape body portion so as to be bent in an U-shape, and the element attaching portion which extends further from the tape bent portion and to which the fastener element is attached, and the fastener element is attached to the element attaching portion of the fastener tape in such a manner that the coupling head protrudes outward from the tape bent portion. 
     In this case, the fastener stringer of the invention can form a fastener stringer in which the fastener element is woven into the element attaching portion simultaneously with weaving of the fastener tape. 
     Further, the invention is ideally applied to a so-called standard-type fastener stringer in which the fastener tape includes the tape body portion and the element attaching portion which extends in the tape width direction from one side edge of the tape body portion and to which the fastener element is attached, and the fastener element is attached to the element attaching portion of the fastener tape in such a manner that the coupling head protrudes outward from the tape side end edge at the element attaching portion side. 
     In the fastener stringer for the slide fastener or the standard-type fastener stringer according to the invention, even when the fastener stringer is curved in the tape width direction of the fastener tape, it is possible to prevent the occurrence of partial floating, sinking, or wavy wrinkles in the tape extension portion of the fastener tape, or to make them small so as not to be noticeable even when partial floating, sinking, or wavy wrinkles occur. 
     Moreover, in the slide fastener of the invention having the fastener stringer having the above-described configuration, the dimension in the tape width direction of the tape extension portion of the fastener tape is set to be smaller than 12 mm, and preferably 10 mm or smaller, and particularly preferably 6 mm or smaller. Thus, when the slide fastener of the invention is sewn to be attached to a fastener-attached product in a state where the slide fastener is curved in the tape width direction, it is possible to stably perform sewing of the fastener stringer. 
     Moreover, in the slide fastener sewn to be attached to a fastener-attached product, it is possible to prevent the occurrence of partial floating, sinking, or wavy wrinkles in the fastener tape, or to make them small so as not to be noticeable even when partial floating, sinking, or wavy wrinkles occur. Thus, it is possible to prevent deterioration of the quality of external appearance of the fastener-attached product. Moreover, in this case, since the slider and the fastener tape rarely rub each other when the slider slides, it is possible to stably secure an excellent sliding property of the slider. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a rear view illustrating the rear side of a concealed slide fastener according to a first embodiment of the invention. 
         FIG. 2  is a cross-sectional view schematically illustrating a cross-section of the concealed slide fastener. 
         FIG. 3  is a copy of the picture of the rear side of the concealed slide fastener. 
         FIG. 4  is a copy of the picture of a front side of the concealed slide fastener. 
         FIG. 5  is a rear view illustrating a state where the concealed slide fastener is curved in a tape width direction. 
         FIG. 6  is a cross-sectional view of a concealed slide fastener according to a second embodiment of the invention. 
         FIG. 7  is a front view of a slide fastener according to a third embodiment of the invention. 
         FIG. 8  is a cross-sectional view of the slide fastener. 
         FIG. 9  is a cross-sectional view illustrating the conventional concealed slide fastener. 
     
    
    
     MODE(S) FOR CARRYING OUT THE INVENTION 
     Hereinafter, modes for carrying out the invention will be described in detail with reference to the drawings. The invention is not limited to the embodiments described below, and various changes can be made as long as substantially the same configuration and the same function and effect as the invention are implemented. 
     For example, although a continuous fastener element described in the following embodiment is formed by molding a monofilament in a coil shape, the invention is not limited to this, and the continuous fastener element may be formed by molding the monofilament in a zigzag shape. 
     First Embodiment 
       FIG. 1  is a rear view illustrating the rear side of a concealed slide fastener according to a first embodiment, and  FIG. 2  is a cross-sectional view schematically illustrating a cross-section of the concealed slide fastener in a comprehensible way. Moreover,  FIG. 3  is a copy of the picture of the rear side of the concealed slide fastener, and  FIG. 4  is a copy of the picture of a front side of the concealed slide fastener. 
     In  FIG. 2 , the cross-section of a concealed slide fastener in which the left and right fastener elements are engaged is schematically shown in order to make the state of warp threads of a fastener tape understood better. For convenience of the drawings, a state where the tape bent portions of the left and right fastener tapes are separated from each other is shown although the left and right fastener elements are engaged with each other. In an actual concealed slide fastener, when the left and right fastener elements are engaged, as will be described below, the tape bent portions of the left and right fastener tapes are in contact with each other so that the fastener elements can be concealed so as not to be visible from the outer surface. 
     Moreover, in the following description, a forward-backward direction indicates a longitudinal direction of a fastener tape, which is the same direction as a sliding direction in which a slider slides. Also, a horizontal direction indicates a tape width direction of a tape body portion of the fastener tape, which is parallel to a tape surface of the tape body portion and is orthogonal to the tape longitudinal direction. 
     Further, a vertical direction indicates a tape front-rear direction orthogonal to the tape surface of the fastener tape, and in particular, a direction of a side of the fastener tape to which a fastener element is attached is defined as an upper side and the opposite direction is defined as a lower side. In this case, the lower surface side of the concealed slide fastener is a front surface side of the concealed slide fastener exposed to the outside. 
     A concealed slide fastener  10  according to the first embodiment is used by being attached to a fastener-attached product such as seat covers of automobile seats, for example. The concealed slide fastener  10  includes a pair of left and right fastener stringers  20  in which an element row  22  is formed, a top stop  11  fixed to a front end side of the element row  22  of each fastener stringer  20 , a bottom stop  12  fixed to a rear end side of the element row  22  of each fastener stringer  20 , and a concealed slide fastener slider  13  attached so as to be slidable along the element row  22 . 
     The concealed slide fastener  10  is configured such that the slider  13  is slid toward the top stop  11  to allow the left and right element rows  22  to engage with each other to close the concealed slide fastener  10 , and the slider  13  is slid toward the bottom stop  12  to allow the left and right element rows  22  to be separated from each other to open the concealed slide fastener  10 . The top stop  11 , the bottom stop  12 , and the concealed slide fastener slider  13  of the concealed slide fastener  10  have the same configuration as those generally used in the conventional art. 
     In the first embodiment, each of the left and right fastener stringers  20  includes a sewn fastener tape  21  and a coil-shaped fastener element  23  attached to the fastener tape  21 , and the coil-shaped continuous fastener element  23  is woven into the fastener tape  21 , whereby the element row  22  is formed. 
     The fastener tape  21  includes an element attaching portion  21   a  in which the fastener element  23  is woven, a tape bent portion  21   b  that extends in the tape width direction from one side edge of the element attaching portion  21   a  so as to be bent in an U-shape, and a tape body portion  21   c  that extends further from the tape bent portion  21   b  and is a portion woven to a fastener-attached product. 
     The fastener element  23  includes a coupling head  23   a  formed by molding a monofilament made of a thermoplastic resin such as polyamide or polyester into a coil shape, upper and lower leg portions  23   b  and  23   c  formed so as to extend in the tape width direction from the coupling head  23   a , and a connecting portion  23   d  that connects an edge end portion of the upper leg portion  23   b  or the lower leg portion  23   c  to the lower leg portion  23   c  or the upper leg portion  23   b  of a fastener element  23  that is adjacent in the forward-backward direction. The fastener element  23  is attached to the element attaching portion  21   a  of the fastener tape  21  in a state where the coupling head  23   a  protrudes outward from the tape bent portion  21   b  of the fastener tape  21 . 
     The fastener tape  21  of the first embodiment is woven by inserting a ground weft thread  24   a  in an opening of a warp thread by reciprocating a carrier bar, and as illustrated in  FIG. 2 , the tape body portion  21   c  and the tape bent portion  21   b  are fabrics that are woven from the ground weft thread  24   a  formed of a two-folded yarn and a plurality of ground warp threads  24   b . Moreover, a knitting needle (not illustrated) is inserted into a tape end edge on a side of the tape body portion  21   c  opposite to the side where the tape bent portion  21   b  is formed, and the ground weft threads  24   a  at the next positions are successively hooked to join the loop-like bent ends. 
     An upper fixing warp thread  24   c  that passes in the warp direction over the upper surface side of the upper leg portion  23   b  of each fastener element  23 , a lower fixing warp thread  24   d  that passes in the warp direction over the lower surface side of the lower leg portion  23   c  of each fastener element  23 , a fastening warp thread  24   e  that passes in the warp direction so as to intersect each other between the upper and lower leg portions  23   b  and  23   c , a positioning warp thread  24   f  that restricts the positions in the weft direction of the upper and lower fixing warp threads  24   c  and  24   d , and a ground weft thread  24   a  that is inserted into the tape body portion  21   c  and the tape bent portion  21   b  are disposed in the element attaching portion  21   a  of the fastener tape  21 . Since the element attaching portion  21   a  is formed using these warp threads  24   c ,  24   d ,  24   e , and  24   f  and the ground weft thread  24   a , it is possible to tightly weave the fastener element  23  into the element attaching portion  21   a  and to stabilize the attachment state of the fastener element  23 . 
     Moreover, polyester textured yarns having a thickness in the range from 160 decitex to 550 decitex are used for the various types of warp threads  24   b  to  24   f  disposed in the element attaching portion  21   a , the tape bent portion  21   b , and the tape body portion  21   c  of the fastener tape  21 , and polyester textured yarns having a thickness in the range from 550 decitex to 1100 decitex are used for the single yarns of the ground weft thread  24   a.    
     In particular, in the case of the first embodiment, the various types of warp threads  24   b  to  24   f  disposed in the element attaching portion  21   a , the tape bent portion  21   b , and the tape body portion  21   c  have a thickness of 330 decitex, and the single yarns of the ground weft thread  24   a  have a thickness of 700 decitex. In the invention, the thickness and material of the ground weft thread and various warp threads are not particularly limited, but can be appropriately changed according to the size of the fastener element and the purpose or the like of the concealed slide fastener. 
     In the concealed slide fastener  10  of the first embodiment, the tape body portion  21   c  of the fastener tape  21  includes a tape extension portion  25  that extends beyond an end edge of the fastener element  23  at the connecting portion  23   d  side. That is, in the concealed slide fastener  10  of the first embodiment, when the position of the end edge of the fastener element  23  at the connecting portion  23   d  side in relation to the horizontal direction of the concealed slide fastener  10  is used as a reference position, the dimension in the tape width direction of the tape body portion  21   c  is set so that an extension length X from the reference position to a tape end edge of the fastener tape  21  at the tape body portion  21   c  side satisfies a range of X&gt;0 mm. In this case, when the concealed slide fastener  10  is observed from the fastener element  23  side, the tape extension portion  25  is exposed to the outside more than the connecting portion  23   d  of the fastener element  23 . 
     By setting the extension length X from the reference position to the tape end edge to satisfy the range of X&gt;0 mm in this manner, it is possible to reliably provide the tape extension portion  25  to the left and right fastener tapes  21 . In this manner, when the fastener tape  21  is formed while weaving the fastener element  23  therein using a loom as will be described below, it is possible to smoothly weave the fastener tape  21  while pulling (conveying) the tape extension portion  25  of the woven fastener tape  21  between upper and lower rollers (not illustrated) on the downstream side of the loom. Thus, it is possible to stably weave the fastener tape  21  having a desired woven fabric with high accuracy while preventing flipping over or bending of the fastener tape  21 . 
     Further, in the first embodiment, the dimension in the tape width direction of the tape extension portion  25  of the fastener tape  21  is restricted to 6 mm or smaller. That is, the dimension in the tape width direction of the tape body portion  21   c  is set so that the extension length X from the reference position to the tape end edge of the fastener tape  21  at the tape body portion  21   c  side satisfies a range of 0 mm&lt;X≦6 mm. 
     In this case, since the thickness of the ground warp thread  24   b  disposed in the tape body portion  21   c  is set to 330 decitex as described above, and the tape extension portion  25  has, for example, a width dimension of 3 mm, approximately twenty ground warp threads  24   b  are disposed in the tape extension portion  25  ( FIG. 2  illustrates the cross-section while decreasing the number of ground warp threads  24   b  disposed in the tape extension portion  25  in order to easily understand the features of the concealed slide fastener  10  of the first embodiment). Moreover, in the first embodiment, by decreasing the number of warp threads disposed in the tape body portion  21   c  of the fastener tape  21  (specifically, the number of warp threads disposed in the tape body portion  21   c  other than an ear portion  26  described below), the dimension in the tape width direction of the tape extension portion  25  of the fastener tape  21  is restricted. 
     In this manner, since the extension length X (the dimension in the tape width direction) of the tape extension portion  25  is 6 mm or smaller, when the concealed slide fastener  10  (the fastener stringer  20 ) is curved in the tape width direction of the fastener tape  21  as illustrated in  FIG. 5 , for example, it is possible to effectively prevent the tape extension portion  25  from partially floating or sinking and to prevent the occurrence of wavy wrinkles in the tape extension portion  25 . Thus, it is possible to maintain the tape extension portion  25  in a flat form. 
     In this case, the shorter the extension length X, the easier it is to maintain the tape extension portion  25  in a flat form even when the fastener stringer  20  is curved in the tape width direction. However, if the dimension in the tape width direction of the tape extension portion  25  decreases, it may be difficult to sew the fastener stringer  20  when the tape body portion  21   c  of the fastener stringer  20  is sewn to be attached to a fastener-attached product. 
     That is, in the concealed slide fastener  10  of the first embodiment, when the extension length X from the reference position of the fastener tape  21  to the tape end edge is in the range of 0 mm&lt;X≦2 mm, even when the fastener stringer  20  is greatly curved in the tape width direction, it is possible to suppress the tape extension portion  25  from partially floating more effectively than when the extension length X is in the range of 4 mm&lt;X≦6 mm. Thus, it is possible to stably hold the tape extension portion  25  in a flat form. 
     On the other hand, for example, when the extension length X from the reference position of the fastener tape  21  to the tape end edge is in the range of 4 mm&lt;X≦6 mm, it is possible to press the tape body portion  21   c  of the fastener tape  21  with the foot of a sewing machine more stably when sewing the fastener stringer  20  to a fastener-attached product using the sewing machine, for example, as compared to when the extension length X is in the range of 0 mm&lt;X≦2 mm. Thus, it is possible to perform sewing of the fastener stringer  20  more smoothly. 
     Moreover, when the extension length X from the reference position of the fastener tape  21  to the tape end edge is in the range of 2 mm&lt;X≦4 mm, for example, it is possible to hold the tape extension portion  25  in a flat form when the fastener stringer  20  is greatly curved in the tape width direction. Moreover, it is possible to perform sewing of the fastener stringer  20  smoothly when sewing the fastener stringer  20  to a fastener-attached product. In the first embodiment, the size of the extension length X of the fastener tape  21  may be selected optionally within the range of 0 mm&lt;X≦6 mm according to the purpose or the like of the concealed slide fastener  10 . 
     Moreover, in the concealed slide fastener  10  of the first embodiment, the tape body portion  21   c  of the fastener tape  21  has an ear portion  26  disposed in a tape side edge portion on a side opposite to the tape bent portion  21   b , and the ground warp thread  24   b  disposed in the ear portion  26  has tensile strength higher than that of the ground warp thread  24   b  disposed in portions other than the ear portion  26  of the tape body portion  21   c . In this manner, since the ground warp thread  24   b  disposed in the ear portion  26  has high tensile strength, as shown by the copy of the picture of the concealed slide fastener  10  in  FIGS. 3 and 4 , for example, the ground warp thread  24   b  disposed in the ear portion  26  becomes in a state where it extends more strongly than the ground warp thread  24   b  disposed in the inner side. 
     In this case, the number of ground warp threads  24   b  disposed in the ear portion  26  is preferably set in the range from 4 to 6, and in the first embodiment, six warp threads having high tensile strength are disposed in the ear portion  26 . Since four or more high-tensile-strength warp threads are disposed in the ear portion  26  of the fastener tape  21 , even when the tensile strength applied to the ground weft thread  24   a  is high (strong) or when the fastener tape  21  is curved in the tape width direction, it is possible to prevent an end edge of the fastener tape  21  at the ear portion  26  side from being twisted or bent and to stably hold the shape of the fastener tape  21 . 
     Moreover, since four or more high-tensile-strength warp threads are disposed in the ear portion  26 , it is possible to stabilize the woven fabrics of the fastener tape  21  on the inner side of the ear portion  26 , and for example, even when the concealed slide fastener  10  is washed, it is possible to prevent the position of woven patterns from being shifted. Further, it is possible to greatly expand the degree of freedom in the choice of woven fabrics employed in the fastener tape  21 . 
     On the other hand, since six or smaller high-tensile-strength warp threads are disposed in the ear portion  26  of the fastener tape  21 , it is possible to prevent the tensile strength in the tape longitudinal direction of the ear portion  26  of the fastener tape  21  from becoming too strong. In this way, it is possible to prevent the occurrence of a so-called biased state in the fastener stringer  20 , the state being a state where the entire fastener tape  21  is curved so that the tape side edge portion of the fastener tape  21  at the ear portion  26  side is contracted greatly and the tape side edge portion has a concave shape. 
     Next, a method of manufacturing the concealed slide fastener  10  according to the first embodiment will be described. First, the fastener stringer  20  is manufactured. Specifically, a weft thread is inserted into the openings of warp threads disposed in a predetermined number by reciprocating a carrier bar using a loom to form the fastener tape  21  having a predetermined dimension in the tape width direction in a desired woven fabric. In this case, the tensile strength of the warp thread is adjusted so that the tensile strength of the ground warp thread  24   b  disposed in the ear portion  26  of the fastener tape  21  is increased, whereby the fastener tape  21  is woven. 
     Moreover, simultaneously with the weaving of the fastener tape  21  in this manner, the coil-shaped fastener element  23  molded of a monofilament is woven into the element attaching portion  21   a  of the fastener tape  21  in a state where the coupling head  23   a  faces the inner side of the fastener tape  21 . 
     Subsequently, after the fastener tape  21  is woven, a tape portion of the fastener tape  21  that becomes the tape bent portion  21   b  is bent in a U-shape so that the coupling head  23   a  of the fastener element  23  protrudes outward from the U-shaped tape bent portion  21   b . Further, a thermosetting process is performed on the fastener tape  21  having such a bent shape. In this manner, the fastener stringer  20  for the concealed slide fastener in which the coupling head  23   a  protrudes outward from the tape bent portion  21   b  is obtained. 
     Further, the two obtained fastener stringers  20  are combined together, and the slider  13  is slidably attached to the element rows  22  of the fastener stringers  20 , whereby the concealed slide fastener  10  of the first embodiment is manufactured. In the concealed slide fastener  10 , when the left and right fastener elements  23  are engaged, the tape bent portions  21   b  of the left and right fastener tapes  21  can be brought into contact with each other. Therefore, when the concealed slide fastener  10  is observed from the lower surface side (the side exposed to the outside), the left and right fastener elements  23  in the engaged state can be concealed by the fastener tape  21  (in particular, the tape bent portion  21   b  and the tape body portion  21   c ). 
     In the concealed slide fastener  10  of the first embodiment manufactured in the above-described manner, the extension length X (the dimension in the tape width direction) of the tape extension portion  25  of the fastener tape  21  is set to 6 mm or smaller that is extremely small than that of the conventional concealed slide fastener  10 . Thus, it is possible to reduce the manufacturing cost of the concealed slide fastener  10  and to reduce the weight. Moreover, even when the concealed slide fastener  10  is curved in the tape width direction of the fastener tape  21  as illustrated in  FIG. 5 , it is possible to effectively suppress the tape extension portion  25  of the fastener tape  21  from partially floating or sinking and to prevent the occurrence of wavy wrinkles in the tape extension portion  25 . Thus, it is possible to maintain the tape body portion  21   c  of the fastener tape  21  in an approximately flat form. 
     Thus, when the concealed slide fastener  10  of the first embodiment is sewn to be attached to a fastener-attached product such as automobile seat covers in a state where the concealed slide fastener  10  is curved in the tape width direction of the fastener tape  21 , it is possible to decrease or prevent the occurrence of swelling in the tape front-rear direction of the fastener tape  21  when the tape body portion  21   c  (in particular, the position of the tape body portion  21   c  at the tape bent portion  21   b ) of the fastener tape  21  and the fastener-attached product are sewn and attached together. Thus, it is possible to stably perform sewing of the concealed slide fastener  10  (or the fastener stringer  20 ) while maintaining the tape body portion  21   c  of the fastener tape  21  in an approximately flat form. 
     Further, even after the concealed slide fastener  10  of the first embodiment is sewn to be attached to the fastener-attached product in a state where the concealed slide fastener  10  is curved in the tape width direction of the fastener tape  21 , it is possible to prevent the occurrence of partial floating, sinking, or wavy wrinkles in the fastener tape  21  or to make them small so as not to be noticeable even when partial floating, sinking, or wavy wrinkles occur. Therefore, it is possible to prevent deterioration of the quality of external appearance of the fastener-attached product to which the concealed slide fastener  10  is sewn and attached. 
     Moreover, when the slider  13  is slid to open the concealed slide fastener  10 , since the occurrence of partial floating, sinking, or wavy wrinkles in the fastener tape  21  of the concealed slide fastener  10  is prevented or is small, the sliding resistance of the slider  13  may not increase due to the rubbing of the slider  13  and the fastener tape  21 , and deterioration of the sliding property of the slider  13  can be prevented. 
     Moreover, in the concealed slide fastener  10  of the first embodiment, four to six warp threads having such high tensile strength as described above are disposed in the tape side edge portion of the fastener tape  21  at the tape body portion  21   c  side, whereby the ear portion  26  is formed. In this way, it is possible to stably hold the form (in particular, the form of the tape body portion  21   c ) of the fastener tape  21 . Thus, when the concealed slide fastener  10  is curved in the tape width direction so as to be sewn to the fastener-attached product, it is possible to hold the tape extension portion  25  of the fastener tape  21  in an approximately flat form more reliably and to neatly perform sewing of the concealed slide fastener  10  more stably. 
     Second Embodiment 
       FIG. 6  is a cross-sectional view of a concealed slide fastener according to a second embodiment. 
     A concealed slide fastener  30  according to the second embodiment is configured such that unlike the first embodiment described above, the fastener element  43  is not woven into the element attaching portion simultaneously with the weaving of the fastener tape, but the fastener element  43  is sewn to be attached to the element attaching portion  41   a  of the fastener tape  41  after the fastener tape  41  is woven in a predetermined tape width dimension. Hereinafter, the concealed slide fastener  30  of the second embodiment will be described in detail. 
     The concealed slide fastener  30  of the second embodiment includes a pair of left and right fastener stringers  40  having an element row formed of a fastener element  43 , a top stop (not illustrated) fixed to a front end side of the element row of each fastener stringer  40 , a bottom stop (not illustrated) fixed to a rear end side of the element row of each fastener stringer  40 , and a concealed slide fastener slider (not illustrated) attached to as to be slidable along the element row. 
     Each of the left and right fastener stringers  40  includes a woven fastener tape  41  and a coil-shaped fastener element  43  sewn to be attached to the fastener tape  41 , and when the fastener element  43  is sewn to be attached to the fastener tape  41 , an element row is formed. 
     The fastener tape  41  includes an element attaching portion  41   a  sewn to be attached to the fastener element  43 , a tape bent portion  41   b  that extends in the tape width direction from one side edge of the element attaching portion  41   a  so as to be bent in an U-shape, and a tape body portion  41   c  that extends further from the tape bent portion  41   b  and is a portion woven to a fastener-attached product. 
     In this case, polyester textured yarns having a thickness of 330 decitex are used for the various types of warp threads disposed in the element attaching portion  41   a , the tape bent portion  41   b , and the tape body portion  41   c , and polyester textured yarns having a thickness of 700 decitex are used for the single yarns of the weft threads. 
     The fastener element  43  includes a coupling head  43   a , upper and lower leg portions  43   b  and  43   c  formed so as to extend in the tape width direction from the coupling head  43   a , and a connecting portion  43   d  that connects an extension end portion of the upper leg portion  43   b  or the lower leg portion  43   c  to the lower leg portion  43   c  or the upper leg portion  43   b  of an element that is adjacent in the forward-backward direction. 
     Moreover, the fastener element  43  is sewn to be attached to the element attaching portion  41   a  of the fastener tape  41  by sewing a sewing thread  47  to draw a double ring in a state where a core thread  48  is inserted between the upper and lower leg portions  43   b  and  43   c , and the coupling head  43   a  protrudes outward from the tape bent portion  41   b  of the fastener tape  41 . 
     In the concealed slide fastener  30  of the second embodiment, the fastener tape  41  includes a tape extension portion  45  that extends outward more than the connecting portion  43   d  of the fastener element  43  so as to be exposed to the outside when the concealed slide fastener  30  is observed from the fastener element  43  side. That is, in the concealed slide fastener  30  of the second embodiment, when the position of an end edge of the fastener element  43  at the connecting portion  43   d  side in relation to the horizontal direction of the concealed slide fastener  30  is used as a reference position, a dimension in the tape width direction of the tape body portion  41   c  is set so that an extension length X from the reference position to a tape end edge of the fastener tape  41  at the tape body portion  41   c  side satisfies a range of X&gt;0 mm. 
     By setting the extension length X from the reference position to the tape end edge to satisfy the range of X&gt;0 mm in this manner, it is possible to provide the tape extension portion  45  to the left and right fastener tapes  41 . In this manner, in manufacturing of the concealed slide fastener  30 , for example, when the concealed slide fastener  30  is conveyed in a state of a fastener chain in order to perform a thermosetting process, a dying process, or the like on the fastener tape  41 , it is possible to reliably put the tape extension portion  45  of the fastener tape  41  so as to be placed between upper and lower rollers. Thus, it is possible to stably perform a predetermined process on the fastener chain while preventing flipping over or bending of the fastener tape  41 . 
     Moreover, in the concealed slide fastener  30  of the second embodiment, a dimension in the tape width direction of the tape extension portion  45  of the fastener tape  41  is restricted to 6 mm or smaller. That is, the dimension in the tape width direction of the tape body portion  41   c  is set so that the extension length X from the reference position to the tape end edge of the fastener tape  41  at the tape body portion  41   c  side satisfies the range of 0 mm&lt;X≦6 mm. 
     Further, in the concealed slide fastener  30  of the second embodiment, the tape body portion  41   c  of the fastener tape  41  has an ear portion  46  disposed in a tape side edge portion on a side opposite to the tape bent portion  41   b , and the warp thread disposed in the ear portion  46  has tensile strength higher than that of the warp thread disposed in portions other than the ear portion  46  of the tape body portion  41   c . In this case, six warp threads having high tensile strength are disposed in the ear portion  46 . In this way, it is possible to stabilize the form of the fastener tape  41  without causing a bias in the fastener tape  41 . 
     In the concealed slide fastener  30  of the second embodiment having the above-described configuration, the extension length X of the tape extension portion  45  of the fastener tape  41  is restricted to 6 mm or smaller. Moreover, the ear portion  46  in which the warp threads having high tensile strength are disposed is formed in the tape side edge portion of the fastener tape  41  at the tape body portion  41   c  side. Thus, the concealed slide fastener  30  of the second embodiment can provide the same advantages as those of the concealed slide fastener  30  according to the first embodiment described above. 
     Third Embodiment 
       FIG. 7  is a front view of a slide fastener according to a third embodiment, and  FIG. 8  is a cross-sectional view of the slide fastener. 
     A standard-type slide fastener  50  (hereinafter, the standard-type slide fastener will be referred to simply as a “slide fastener”) according to the third embodiment includes a pair of left and right fastener stringers  60  in which an element row  62  is disposed, a top stop  51  fixed to a front end side of the element row  62  of each fastener stringer  60 , a bottom stop  52  fixed to a rear end side of the element row  62  of each fastener stringer  60 , and a slider  53  attached so as to be slidable along the element row  62 . In this case, the top stop  51 , the bottom stop  52 , and the slider  53  have the same configuration as those generally used in the conventional art. 
     In the third embodiment, each of the left and right fastener stringers  60  includes a woven fastener tape  61  and a coil-shaped fastener element  63  sewn to be attached to the fastener tape  61 , and when the fastener element  63  is sewn to be attached to the fastener tape  61 , an element row  62  is formed. 
     The fastener tape  61  includes an element attaching portion  61   a  to which the fastener element  63  is sewn and attached and a tape body portion  61   b  that extends in the tape width direction from one side edge of the element attaching portion  61   a  so as to be sewn to a fastener-attached product. In this case, polyester textured yarns having a thickness of 330 decitex are used for a plurality of warp threads disposed in the element attaching portion  61   a  and the tape body portion  61   b , and polyester textured yarns having a thickness of 700 decitex are used for the single yarns of the weft threads. 
     The fastener element  63  includes a coupling head  63   a , upper and lower leg portions  63   b  and  63   c  formed so as to extend in the tape width direction from the coupling head  63   a , and a connecting portion  63   d  that connects an extension end portion of the upper leg portion  63   b  or the lower leg portion  63   c  to the lower leg portion  63   c  or the upper leg portion  63   b  of the element that is adjacent in the forward-backward direction. 
     Moreover, the fastener element  63  is sewn to be attached to the element attaching portion  61   a  by sewing a sewing thread  67  to draw a double ring in a state where a core thread  68  is inserted between the upper and lower leg portions  63   b  and  63   c , and the coupling head  63   a  protrudes outward from a tape side end edge of the fastener tape  61  at the element attaching portion  61   a  side. 
     In the slide fastener  50  of the third embodiment, the fastener tape  61  includes a tape extension portion  65  that extends outward more than the connecting portion  63   d  of the fastener element  63  so as to be exposed to the outside when the slide fastener  50  is observed from the fastener element  63  side (front side). That is, in the slide fastener  50  of the third embodiment, when the position of an end edge of the fastener element  63  at the connecting portion  63   d  side in relation to the horizontal direction of the slide fastener  50  is used as a reference position, the dimension in the tape width direction of the tape body portion  61   b  is set so that an extension length X from the reference position to the tape end edge of the fastener tape  61  at the tape body portion  61   b  side satisfies a range of X&gt;0 mm. 
     By setting the extension length X from the reference position to the tape edge to satisfy the range of X&gt;0 mm in this manner, it is possible to provide the tape extension portion  65  to the left and right fastener tapes  61 . In this manner, in manufacturing of the slide fastener  50 , for example, when a sewing process of sewing the fastener element  63  to be attached to the fastener tape  61 , a dying process of the fastener tape  61 , and the like are performed, it is possible to reliably put the tape extension portion  65  of the fastener tape  61  so as to be placed between upper and lower rollers. Thus, it is possible to stably perform a predetermined process on the fastener chain while preventing flipping over or bending of the fastener tape  61 . 
     Moreover, in the slide fastener  50  of the third embodiment, a dimension in the tape width direction of the tape extension portion  65  of the fastener tape  61  is restricted to 6 mm or smaller. That is, the dimension in the tape width direction of the tape body portion  61   b  is set so that the extension length X from the reference position to the tape end edge of the fastener tape  61  at the tape body portion  61   b  side satisfies the range of 0 mm&lt;X≦6 mm. 
     Further, in the slide fastener  50  of the third embodiment, the fastener tape  61  has an ear portion  66  disposed in a tape side edge portion at the tape body portion  61   b  side, and the warp thread disposed in the ear portion  66  has tensile strength higher than that of the warp thread disposed in portions other than the ear portion  66  of the tape body portion  61   b . In this case, six warp threads having high tensile strength are disposed in the ear portion  66 . In this way, it is possible to stabilize the form of the fastener tape  61  without causing a bias in the fastener tape  61 . 
     In the slide fastener  50  of the third embodiment having the above-described configuration, the extension length X of the tape extension portion  65  of the fastener tape  61  is restricted to 6 mm or smaller. Thus, even when the slide fastener  50  is curved in the tape width direction, it is possible to effectively suppress the tape extension portion  65  of the fastener tape  61  from partially floating or sinking and the occurrence of wavy wrinkles. Therefore, it is possible to maintain the fastener tape  61  in an approximately flat form. 
     Therefore, when the slide fastener  50  of the third embodiment is sewn to a fastener-attached product such as automobile seat covers in a state where the slide fastener  50  is curved in the tape width direction of the fastener tape  61 , it is possible to stably sew the tape body portion  61   b  of the fastener tape  61  and the fastener-attached product together. 
     Further, even after the slide fastener  50  of the third embodiment is sewn to be attached to the fastener-attached product in a state where the slide fastener  50  is curved in the tape width direction of the fastener tape  61 , it is possible to prevent the occurrence of partial floating, sinking, or wavy wrinkles in the fastener tape  61  or to make them small so as not to be noticeable even when partial floating, sinking, or wavy wrinkles occur. Therefore, it is possible to prevent deterioration of the quality of external appearance of the fastener-attached product to which the slide fastener  50  is sewn and attached and to prevent deterioration of the sliding property of the slider  53 . 
     DESCRIPTION OF REFERENCE NUMERALS 
     
         
         
           
               10 : CONCEALED SLIDE FASTENER 
               11 : TOP STOP 
               12 : BOTTOM STOP 
               13 : CONCEALED SLIDE FASTENER SLIDER 
               20 : FASTENER STRINGER 
               21 : FASTENER TAPE 
               21   a : ELEMENT ATTACHING PORTION 
               21   b : TAPE BENT PORTION 
               21   c : TAPE BODY PORTION 
               22 : ELEMENT ROW 
               23 : FASTENER ELEMENT 
               23   a : COUPLING HEAD 
               23   b : UPPER LEG PORTION 
               23   c : LOWER LEG PORTION 
               23   d : CONNECTING PORTION 
               24   a : GROUND WEFT THREAD 
               24   b : GROUND WARP THREAD 
               24   c : UPPER FIXING WARP THREAD 
               24   d : LOWER FIXING WARP THREAD 
               24   e : FASTENING WARP THREAD 
               24   f : POSITIONING WARP THREAD 
               25 : TAPE EXTENSION PORTION 
               26 : EAR PORTION 
               30 : CONCEALED SLIDE FASTENER 
               40 : FASTENER STRINGER 
               41 : FASTENER TAPE 
               41   a : ELEMENT ATTACHING PORTION 
               41   b : TAPE BENT PORTION 
               41   c : TAPE BODY PORTION 
               43 : FASTENER ELEMENT 
               43   a : COUPLING HEAD 
               43   b : UPPER LEG PORTION 
               43   c : LOWER LEG PORTION 
               43   d : CONNECTING PORTION 
               45 : TAPE EXTENSION PORTION 
               46 : EAR PORTION 
               47 : SEWING THREAD 
               48 : CORE THREAD 
               50 : SLIDE FASTENER 
               51 : TOP STOP 
               52 : BOTTOM STOP 
               53 : SLIDER 
               60 : FASTENER STRINGER 
               61 : FASTENER TAPE 
               61   a : ELEMENT ATTACHING PORTION 
               61   b : TAPE BODY PORTION 
               62 : ELEMENT ROW 
               63 : FASTENER ELEMENT 
               63   a : COUPLING HEAD 
               63   b : UPPER LEG PORTION 
               63   c : LOWER LEG PORTION 
               63   d : CONNECTING PORTION 
               65 : TAPE EXTENSION PORTION 
               66 : EAR PORTION 
               67 : SEWING THREAD 
               68 : CORE THREAD 
             X: EXTENSION LENGTH