TWI620522B - Zipper chain and zipper chain - Google Patents

Abstract

The present invention provides a metal fastener element having an engagement head portion (11) and a chain cloth clamping portion (21), and the engagement head portion (11) has a flat plate portion (12) and a protruding arrangement a central protrusion (13) on the upper surface and the lower surface of the flat plate portion (12) and a pair of left and right engagement projections (14), and the left and right engagement projections (14) from the upper surface and the lower surface of the flat portion (12) The left and right outer edges of the middle are arranged to be spaced apart from the inner side in the width direction of the sprocket. Thereby, the zipper element (10) of the zipper (1) can have an appearance like a "small mustard puppet" and has a gloss or color which cannot be obtained by molding. Further, it is possible to prevent the occurrence of mesh cracking when the zipper (1) is bent into a U shape in the meshing state of the fastener element (10).

Description

Zipper chain and zipper chain

The present invention relates to a metal fastener element for a slide fastener.

As one type of fastener element for a slide fastener, a metal fastener element is known. There are several types of the metal fastener elements. For example, as one of the typical types of metal fastener elements, it is known that a metal such as a molten zinc alloy is poured into a mold for holding a fastener chain by die casting, and is formed in a chain of a fastener chain. Zipper sprocket on the side edge of the cloth. Such metal fastener elements formed by die casting generally have a shape as shown in FIG. Specifically, the metal fastener element 72 of the slide fastener 70 shown in FIG. 13 is fixed to the front and back sides of the fastener chain 71. Each of the fastener element teeth 72 has a shape that is symmetrical in the front-back direction (up-and-down direction) of the chain cloth with respect to the center position in the front-back direction of the fastener chain 71. The fastener element 72 has a body portion fixed to the fastener chain 71, a neck portion extending from the body portion, and an engaging head portion extending from the neck portion. In this case, the body portion of the fastener element 72 is formed in a substantially rectangular shape in a plan view of the zipper 70. Further, the neck portion of the fastener element 72 is formed from the main body portion, and the size of the element width direction (the longitudinal direction of the chain cloth) (hereinafter referred to as the sprocket width) is reduced so as to be in a contracted shape in plan view. . The meshing head is formed in a substantially elliptical shape in plan view. Therefore, each of the fastener elements 72 has a shape (appearance) like a "kokeshi" (or "matryoshka") in a plan view of the zipper 70. As another typical type of metal fastener elements, a fastener element formed by punching using a punching punch is known as a flat member made of a metal such as a copper alloy. An example of such a fastener element which is formed by punching a flat member is described in, for example, International Publication No. 2010/089854 (Patent Document 1). The metal fastener element described in Patent Document 1 has a form called a so-called double-sided fastener element. Specifically, the fastener element of Patent Document 1 has an engaging head having a shape symmetrical in the front-back direction (up-and-down direction) of the chain cloth, and a chain cloth holding portion from which the engaging head is attached. One end extends along the length of the sprocket. The engaging head portion of the fastener element has a flat plate portion which is formed thinner than the chain cloth holding portion via the step portion. Further, on the upper surface and the lower surface of the flat plate portion, respectively, an engagement convex portion that protrudes in the up-and-down direction from the flat plate portion, and a left and right ridge portion that are swelled in the up-and-down direction from the flat plate portion and are sandwiched from the chain cloth. It extends toward the left and right sides of the engaging convex portion. The chain nip portion of the fastener element has a coupling portion that is coupled to the meshing head, and a pair of left and right leg portions that are branched and extended from the coupling portion. After the zipper element of the patent document 1 is punched out from the flat member, for example, each of the fastener elements is put into the processing container, and the fastener element is subjected to a grinding process in the container. Thereby, gloss can be imparted to the fastener elements. Further, the fastener element can be colored by applying a coating of a desired color to the fastener element in the container. Further, the corrosion resistance of the fastener element can be improved by performing the treatment of applying the clear paint. The fastener element which has been subjected to the surface treatment such as the polishing treatment is supplied to the side edge portion of the fastener fabric in a specific posture. Then, the left and right leg portions are pressed toward the inner side in a state where the side edge portion of the fastener fabric of the fastener chain is inserted between the left and right leg portions of the fastener element. Thereby, the fastener element is attached to the side edge part of the fastener fabric of the fastener chain one by one, and the fastener chain for a slide fastener is formed. The shape of the fastener element in the plan view of the zipper manufactured by attaching the fastener element to the fastener stringer as described above is completely different from the shape of the fastener element formed by molding, for example, as described above. On the other hand, in the specification of the Chinese Utility Model Publication No. 200959886 (Patent Document 2), as shown in FIG. 14, it is disclosed that the metal flat member is punched and formed, and when attached to the fastener chain cloth. The zipper element 80 has a shape like a "small mustard puppet" in a plan view. The fastener element 80 is also formed as a so-called double-sided fastener element, and has an engagement head 81 having a shape symmetrical in the front-back direction (up-and-down direction) of the chain cloth; and a chain cloth clamping portion 82, One end of the engaging head 81 extends in the longitudinal direction of the sprocket. The engaging head portion 81 has a flat plate portion 84 which is formed thinner than the chain cloth sandwiching portion 82 via the step portion 83. The upper surface and the lower surface of the flat plate portion 84 are respectively provided with a central protruding portion 85 which is protruded from a central portion in the direction of the sprocket width and is coupled to the link holding portion 82; and a pair of left and right engaging convex portions 86 The protrusions are protruded forward of the central protrusion 85. In the zipper having the fastener element 80 of the patent document 2, each of the fastener elements 80 can have an appearance of a fastener element formed by molding in a shape like a "small mustard puppet". similar. PRIOR ART DOCUMENT Patent Document Patent Document 1: International Publication No. 2010/089854 Patent Document 2: Chinese Utility Model Publication No. 200959886

[Problems to be Solved by the Invention] The slide fastener element 80 of Patent Document 2 having an appearance like a "small mustard puppet" as described above is attached to a fastener stringer to manufacture a slide fastener. In this case, when the zipper is engaged with the left and right fastener elements 80, the front side portions (or the back side portions of the chain cloth) of the fastener elements 80 adjacent to each other in the longitudinal direction of the chain cloth are close to each other. When the method is bent into a substantially U-shape in the longitudinal direction of the chain fabric, there is a problem that the meshing and disengaging (also referred to as chain splitting) of the left and right fastener elements 80 is likely to occur. Accordingly, it is an object of the present invention to provide a fastener element, and a fastener stringer having the fastener element, the fastener element having the following characteristics: a zipper similar to a fastener element formed by die casting It has a shape like an "small mustard puppet" in a plan view, and can be subjected to a surface treatment such as a polishing treatment, and further, in a state in which the zipper is meshed with the left and right fastener elements, it is bent in the longitudinal direction of the chain to substantially U. The shape of the word is also less likely to cause the meshing to split. [Technical means for solving the problem] In order to achieve the above object, the most important feature of the fastener element provided by the present invention is that it is a metal fastener element having an engaging head and a chain cloth. a clamping portion extending from one end of the engaging head toward a rear side of the sprocket longitudinal direction; and the engaging head portion has a flat plate portion that is thinner than the chain cloth sandwiching portion via the step portion; a protruding portion that is protruded from a central portion in a sprocket width direction of the upper surface and the lower surface of the flat plate portion, and a pair of right and left engaging convex portions that are protruded from the upper surface and the lower surface of the flat plate portion a front side of the central protrusion; and an insertion groove portion between the right and left engagement protrusions, and the left and right engagement protrusions and the chain cloth clamping portion on the left and right sides of the central protrusion The left and right insertion recesses are provided therebetween, and the left and right engagement projections are spaced apart from the left and right outer edges of the upper surface and the lower surface of the flat plate portion toward the inner side in the sprocket width direction. Home. In the fastener element of the present invention, it is preferable that each of the left and right end portions of the engaging convex portion has an outer end portion disposed on the outer side in the sprocket width direction and is disposed adjacent to the insertion groove portion. The inner end portion of the inner side has an asymmetrical shape, and the outer end portion of the distal end portion has an inclined portion that gradually decreases the height dimension of the engaging convex portion from the flat plate portion toward the outer side in the sprocket width direction. In this case, it is preferable that a corner portion is disposed between a distal end edge and an inner edge of the engaging convex portion when the left and right engaging convex portions are viewed from the front, and the inclined portion of the outer end portion is The leading edge and the outer edge of the engaging convex portion are inclined downward toward the outer edge, and have a size of 10% or more of a minimum width dimension between the inner edge and the outer edge of the engaging convex portion in the sprocket width direction. And configuration. Further, in the fastener element according to the invention, it is preferable that the engaging head has a raised portion which is disposed between the right and left engaging convex portions and which is raised from the upper surface and the lower surface of the flat plate portion, and the raised portion The portion is coupled to the central protrusion and the left and right meshing convex portions. Furthermore, it is preferable that the chain cloth sandwiching portion has a clamping base end portion coupled to the meshing head portion, and left and right leg portions that branch and extend from the pinch base end portion; and left and right fins a portion that is bent inward from the end portion of each leg portion and extends rearward; the left and right fin portions have inner side faces that face each other and outer side faces that are disposed on opposite sides of the inner side surface, and the fin portions are The inner side surface is inclined with respect to the outer side surface of the fin portion such that the dimension between the inner side surface and the outer side surface gradually decreases toward the end of the fin portion. In this case, it is preferable that the outer side surface of the fin portion is disposed in parallel with the outer surface of the leg portion. Further preferably, the inclination angle of the inner side surface of the fin portion with respect to the outer side surface is set to be 2 or more and 15 or less. Moreover, according to the present invention, it is possible to provide a fastener stringer in which a plurality of the fastener elements having the above-described form are attached to a side edge portion of a fastener fabric. In this case, it is preferable that the step portion of the fastener element is disposed further rearward than the inner side portion of the step portion with respect to the sprocket width direction with respect to the left and right outer portions of the step portion. tilt. [Effects of the Invention] The fastener element of the present invention integrally has an engaging head portion and a chain cloth holding portion. The engaging head has a flat plate-shaped flat portion having a flat upper surface and a lower surface, and a central protruding portion projecting from both sides of the upper surface and the lower surface of the flat plate portion; and a pair of right and left engaging convex portions, etc. The position of the center protrusion on both the upper surface and the lower surface of the flat plate portion is protruded forward. Further, the upper surface and the lower surface of the meshing head are respectively provided with: an insertion groove portion disposed between the left and right meshing convex portions; and a right and left insertion concave portion disposed on the left and right sides of the central protruding portion and disposed on Between the right and left engaging projections and the chain cloth clamping portion. Further, in the present invention, the left and right meshing convex portions respectively protruding from the upper surface and the lower surface of the flat plate portion are disposed at positions spaced apart from the left and right outer edges of the upper surface and the lower surface of the flat plate portion toward the inner side in the sprocket width direction. . Therefore, the flat upper surface or the lower surface of the flat plate portion is exposed and disposed on the outer side in the sprocket width direction of the right and left engaging convex portions. When the fastener stringer of the fastener element of the present invention having such a shape is attached to the front side of the chain fabric (or the back side of the chain fabric), the side surface of the thin flat portion of the engaging head can be seen to be symmetrically protruded. The side surface of the engaging convex portion provided on the upper surface and the lower surface of the flat plate portion, and the side surface of the chain cloth sandwiching portion formed thickly from the end portion of the flat plate portion via the step portion. Therefore, the fastener element of the present invention is formed in a shape (appearance) similar to that of the fastener element formed by molding as described above, in a plan view of the zipper. Moreover, the fastener element of the present invention can be stably produced by punching a thin plate-shaped flat member made of a metal such as a copper alloy by punching with a punching punch as described below. The fastener element of the present invention manufactured by punching out from the flat member can be arbitrarily subjected to a surface treatment such as a polishing treatment or a coating treatment before the fastener element is attached to the fastener chain. Further, in the fastener element of the present invention, the left and right meshing convex portions which are provided on the upper surface and the lower surface of the flat plate portion are disposed on the left and right outer edges of the upper surface and the lower surface of the flat plate portion in the direction of the sprocket width. The position separated by the inner side can obtain the following effects. Here, in the zipper having the fastener element 80 of the prior patent document 2, when the zipper is bent in the longitudinal direction of the chain fabric into a substantially U shape in a state in which the left and right fastener elements 80 are engaged, as described above Easy to produce mesh cracking. The inventors of the present invention investigated and ascertained the cause of the occurrence of the mesh splitting, and studied the countermeasures, and as a result, completed the present invention. Specifically, in the case of the fastener element 80 of the above-mentioned Patent Document 2, as shown in Fig. 14, a pair of left and right meshes are respectively provided on the upper surface and the lower surface of the flat plate portion 84 of the engaging head portion 81. Projection 86. The engaging projections 86 are disposed along the outer edge of the flat plate portion 84 in the sprocket width direction. Further, the outer side faces of the respective engaging convex portions 86 are continuously formed from the left and right side end faces of the flat plate portion 84. Therefore, the distal end surface of each of the engaging convex portions 86 also extends to a position away from the center position in the sprocket width direction of the fastener element 80. When the zipper having the fastener element 80 of the above-described Patent Document 2 is bent in a substantially U-shape in the longitudinal direction of the fastener when the left and right fastener elements 80 are engaged, it is located within the fastener element 80. The distal end portion of the engagement convex portion 86 on the circumferential side (concave side) is liable to abut against the flat plate portion 84 of the fastener element 80 on the engagement object side. Therefore, the zipper is hard and it is difficult to bend into a U shape, and the flexibility tends to be lowered. As a result, the distance between the engaging convex portion 86 on the outer peripheral side (convex side) and the flat plate portion 84 of the fastener element 80 on the meshing target side is greatly increased by the contact position. Further, the left and right fastener elements 80 cannot maintain the meshing state, and the meshing and disengaging of the left and right fastener elements 80 are likely to occur. (Further, the mechanism for generating the meshing split is also referred to in FIG. 12 in the following embodiments. Explain in detail). Therefore, in the fastener element of the present invention, the right and left engaging convex portions are disposed to be spaced apart from the left and right outer edges of the upper surface and the lower surface of the flat plate portion, and the left and right outer edges of the flat plate portion are engaged with the right and left outer convex portions. The upper surface and the lower surface of the flat plate portion are disposed between each other. Thereby, the tip end surface of the engaging convex portion of the present invention is disposed at a position which is more inclined toward the inner side in the width direction of the sprocket. Therefore, the zipper manufactured by using the fastener element of the present invention can be bent into a substantially U-shape in the longitudinal direction of the fastener in a state in which the left and right fastener elements are engaged, and can be positioned on the inner peripheral side of each of the fastener elements ( The engaging convex portion of the concave side is less likely to abut against the flat plate portion of the fastener element on the side of the engaging object than in the prior case. With this, it is difficult to increase the interval between the engaging convex portion on the outer peripheral side (convex side) and the flat portion of the fastener element on the meshing target side with the abutting position (interference position) as a fulcrum as in the prior patent document 2 The phenomenon. Therefore, the zipper having the fastener element of the present invention can be bent to a smaller radius of curvature than before. Further, even if it is bent to a small radius of curvature, the meshing crack is unlikely to occur, and the meshing state of the left and right fastener elements can be stably maintained. Further, in the manufacturing step of manufacturing the fastener element of the present invention by punching a metal flat member, the extrusion molding process is performed by using a forming punch (upward from the upper and lower sides of the flat member) Press punches are formed to form right and left engaging projections and central projections. Thereafter, punching processing is performed on the flat member that has been subjected to extrusion molding. In this case, by arranging the right and left engaging projections from the left and right outer edges of the flat portion to the inner side as in the fastener element of the present invention, the punching punch used in the punching process can be improved as follows. Strength. Therefore, even if the punching process using the punching punch is repeatedly performed, the breakage of the punching punch is less likely to occur, and the life of the punching punch can be prolonged. As a result, the replacement frequency of the punching punch is made smaller than before, and the manufacturing cost can be reduced. Further, in the present invention, the right and left engaging convex portions in the engaging head portion are disposed at positions spaced apart from the left and right outer edges of the flat plate portion, and the outer surface and the lower surface of the flat plate portion are provided on the outer side of the engaging convex portion. The way of revealing remains. Thereby, the strength of the fastener element can be appropriately ensured, and the hand feeling of the fastener element can be prevented from being deteriorated. In the fastener element of the present invention, each of the distal end portions of the right and left engaging convex portions has an outer end portion disposed on the outer side in the sprocket width direction, and is asymmetrical with the inner end portion disposed on the inner side adjacent to the insertion groove portion. The shape. Further, the outer end portion of the distal end portion of each of the engaging convex portions has an inclined portion (inclined surface) in which the height dimension of the engaging convex portion from the flat plate portion gradually decreases toward the outer side in the sprocket width direction. In particular, in this case, when the right and left engaging convex portions are viewed from the front, a corner portion is disposed between the distal end edge and the inner edge of the engaging convex portion. Further, the inclined portion disposed at the outer end portion of the engaging convex portion is formed to be inclined downward toward the outer edge between the distal end edge and the outer edge of the engaging convex portion, and has the inner side of the engaging convex portion in the sprocket width direction. 10% or more of the minimum width dimension between the edge and the outer edge. The fastener element of the present invention having the engaging convex portion in the form as described above can be stably shaped like a "small mustard puppet" in a plan view of the zipper. Further, when the corner portion is provided at the inner end portion of the engaging convex portion, when the central protruding portion of the fastener element on the meshing target side is inserted between the right and left engaging convex portions, the insertion state of the central protruding portion can be stably maintained. . Therefore, it is possible to stably ensure that the manufactured zipper has a high meshing strength. Further, the corner portion of the engaging convex portion refers to a portion where the upper surface of the engaging convex portion intersects with the inner side surface, and although the corner portion is formed into an angular shape, it is formed by press molding, and may be formed as A slightly curved shape. Further, by providing the inclined portion as described above at the outer end portion of the engaging convex portion, when the zipper is bent into a substantially U-shape in a state in which the fastener element is meshed as described above, the meshing of the respective fastener elements Since the convex portion is less likely to abut against the flat plate portion of the fastener element on the side of the engagement object, the engagement cracking can be more less likely to occur. Further, in the fastener element of the present invention, the engaging head portion has a raised portion which is disposed between the right and left engaging convex portions and which is raised from the upper surface and the lower surface of the flat plate portion. The raised portion is coupled to the central protrusion and the right and left engagement protrusions. Thereby, the strength of the right and left engaging projections of the engaging head and the strength of the central projection can be effectively improved. As a result, the meshing strength of the manufactured zipper can be stably maintained for a long period of time. Further, by providing the engaging head portion with the above-mentioned raised portion, it is possible to suppress the flow amount of the metal due to the pressing when the forming of the fastener element is performed by the forming punch. Thereby, the burden on the forming punch at the time of extrusion molding can be reduced. Further, since the moldability by extrusion molding of the forming punch can be improved, the engaging convex portion and the central protruding portion having a specific shape can be stably formed, so that the occurrence of molding failure can be reduced. Further, in the present invention, the chain fabric holding portion has a clamping base end portion coupled to the meshing head portion, and left and right leg portions which are branched from the clamp base end portion and extend rearward; and left and right fins The portion is bent inward from the end portion of each leg portion and further extends rearward. By thus providing the fastener element of the present invention with a pair of right and left fin portions, the fastener chain can be held by the left and right leg portions of the fastener element and the left and right fin portions. Therefore, the mounting strength of the fastener elements can be improved. Further, when the zipper is formed by using the fastener element of the present invention, the slider (especially the upper and lower flange portions of the slider) can be prevented from directly slidingly contacting the fastener zipper by the fin of the fastener element. Therefore, even if the slider is repeatedly slid, the fastener chain cloth is not easily damaged, so that the durability of the zipper (especially the zipper chain cloth) can be improved. Further, in this case, the left and right fin portions of the fastener element have the inner side surfaces facing each other and the outer side surfaces disposed on the opposite side of the inner side surface. Further, the outer side surface of the fin portion is disposed in parallel with the outer surface of the leg portion. On the other hand, the inner side surface of the fin portion is inclined with respect to the outer side surface of the fin portion such that the dimension between the inner side surface and the outer side surface gradually decreases toward the end of the fin portion. In particular, it is preferable that the inclination angle of the inner side surface of the fin portion with respect to the outer side surface is set to be 2 or more and 15 or less. By arranging the inner side surface of the fin portion obliquely with respect to the outer side surface in this manner, the base end portion of the inner peripheral surface of the fin portion is firmly fixed by being in contact with the fastener stringer, but the inner peripheral surface of the fin portion is fixed. Since the distal end portion is not strongly pressed as the proximal end portion, it is weaker than the proximal end portion. In other words, one of the pair of fastener elements is attached to the fin portion in such a manner that the force from the base end portion to the end portion of the inner circumferential surface sandwiches the fastener tape from the front side of the chain cloth gradually weakens. Thereby, it is possible to suppress the flexibility of the fastener stringer due to the strong clamping of the fastener chain by the left and right fins of the fastener element, and to ensure the flexibility of the fastener string when forming the fastener. Next, according to the present invention, it is possible to provide a fastener stringer in which a plurality of fastener elements having the above-described form are attached to the side edge portions of the fastener fabric of the fastener chain cloth. In the case of the fastener stringer of the present invention having the above-described fastener element, when the zipper is manufactured, each of the fastener elements has a shape like a "small mustard puppet" in a plan view of the zipper. Further, even when the slide fastener is bent in the longitudinal direction of the chain cloth in a substantially U-shape in a state in which the left and right fastener elements are engaged, the meshing cracking is less likely to occur, and the meshing state of the left and right fastener elements can be stably maintained. Further, in the present invention, it is possible to easily perform surface treatment such as a polishing treatment, a coating treatment, and a plating treatment on the fastener element before attaching the fastener element to the fastener chain. Therefore, the fastener stringer of the present invention can impart gloss or a variety of colors to the fastener elements as compared with, for example, a fastener chain which is formed by molding to form a fastener element. Moreover, the corrosion resistance of the fastener element can also be improved. Thereby, the quality of the zipper can be improved, and the change of the zipper that can be supplied to the market can be easily increased. In the fastener stringer of the present invention, the stepped portion formed between the engaging head portion of each of the fastener elements and the link holding portion is arranged in the left and right outer portions of the step portion with respect to the element width direction. It is inclined further rearward than the inner side portion of the step portion. Thereby, when the zipper is formed and the right and left sprocket rows are engaged, the engaging convex portions of the respective zipper elements can be made less likely to interfere with the link nip portion of the fastener element on the meshing target side. As a result, the flexibility of the zipper (zipper chain) in the meshed state can be appropriately and stably ensured.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Further, the present invention is not limited to the embodiments described below, and various modifications can be made as long as they have substantially the same configuration as the present invention and exhibit the same operational effects. For example, the fastener elements of the following embodiments are manufactured by punching a flat metal wire into a specific sprocket shape. However, the fastener element of the present invention includes, for example, a metal fastener element as follows, that is, a Y-shaped sprocket element is formed by sequentially cutting a long wire having a Y-shaped cross section, and The portion of the obtained sprocket element corresponding to the engaging head portion is locally pressed and deformed to be manufactured. [Embodiment] Fig. 1 is a perspective view showing a fastener element of the embodiment before being attached to a fastener chain cloth. 2, 3, and 4 are a plan view, a side view, and a front view, respectively, of the fastener element. In the following description of the fastener element, the sprocket height direction or the sprocket up-and-down direction refers to the direction in which the fastener element is attached to the fastener chain. The sprocket width direction or the sprocket left and right direction refers to a direction in which the fastener element is attached to the zipper chain cloth in the direction of the front and back of the chain cloth. The sprocket longitudinal direction or the sprocket front-back direction refers to a direction in which the fastener element is attached to the fastener zipper in the width direction of the chain. In particular, the front side of the sprocket longitudinal direction means the direction from the chain nip portion of the fastener element toward the meshing head, and the sprocket longitudinal direction is the opposite direction. In the fastener element 10 of the present embodiment shown in FIG. 1 to FIG. 4, the flat wire 30 made of a metal such as a copper alloy, a nickel alloy or an aluminum alloy is extruded using a forming punch (not shown). Forming. Thereafter, the extruded flat wire is punched into a specific sprocket shape by using a punching punch 40 (also referred to as a blanking punch) to be described below. The fastener element 10 of the present embodiment has an engaging head portion 11 which is provided with a central protruding portion 13 and left and right engaging convex portions 14 on both the upper surface and the lower surface of the flat plate portion 12; and a chain cloth holding portion 21, one end portion (rear end portion) of the self-engaging head portion 11 is extended via the step portion 20. The fastener element 10 is formed as a so-called double-sided fastener element in which a pair of right and left engagement projections 14 are disposed on the upper surface side and the lower surface side of the engagement head portion 11, respectively. In particular, in the fastener element 10 of the present embodiment, the engaging head portion 11 is formed symmetrically in the up-and-down direction with reference to the center position in the sprocket height direction. Therefore, the central projection 13 of the engaging head portion 11, the engaging convex portion 14, and the bulging portion 15 described below are mainly described for the upper surface side of the fastener element 10 in order to avoid redundancy, and are arranged on the fastener element. The central protrusion portion 13, the engagement convex portion 14, and the raised portion 15 on the lower surface side of the lower surface 10 are denoted by the same reference numerals, and the description thereof will be omitted. The engaging head portion 11 of the fastener element 10 has a thin plate-like flat portion 12 disposed at a central portion in the vertical direction, a central protruding portion 13 projecting from the upper surface and the lower surface of the flat plate portion 12, and a pair of right and left engaging convex portions. 14. The ridge portion 15 disposed between the pair of right and left engaging projections 14. Further, the engaging head portion 11 is formed with the insertion groove portion 16 disposed between the right and left engaging convex portions 14, and the left and right sides of the center protruding portion 13 and between the engaging convex portion 14 and the chain cloth sandwiching portion 21 The recess 17 is inserted to the left and right. The flat plate portion 12 of the engaging head portion 11 has an upper surface, a lower surface, and side surfaces that connect the upper surface and the lower surface. The thickness (height size) of the flat plate portion 12 is smaller than the thickness (height size) of the chain cloth sandwiching portion 21. The upper surface and the lower surface of the flat plate portion 12 are formed by a flat surface orthogonal to the height direction of the sprocket. Therefore, the dimension (thickness dimension) in the direction of the sprocket height of the flat plate portion 12 is set to a specific fixed size in the entirety of the flat plate portion 12. Further, when the left and right side edges of the flat plate portion 12 are viewed from the element tooth in the vertical direction, the dimension (width dimension) in the direction of the sprocket width is connected from the base end portion of the chain nip portion 21 toward the engaging head portion 11. The tip end portion (front end portion) is gradually reduced so as to be inclined with respect to the longitudinal direction of the fastener element. In particular, in the fastener element 10 of the present embodiment, the flat upper surface of the flat plate portion 12 is disposed on the front side and the rear side of the right and left engaging convex portions 14, and is also disposed in the sprocket width direction of the engaging convex portion 14. On the outside side. Further, a side edge which is a boundary (ridge line portion) is disposed between the upper surface of the flat plate portion 12 and the side surface of the flat plate portion 12, and the side edge of the flat plate portion 12 and the base end portion of the engaging convex portion 14 are formed by the flat plate portion. The top surface of 12 is completely separated. The central projection 13 of the engaging head portion 11 is swelled from the upper surface of the flat plate portion 12. The central projection 13 is formed in a rectangular parallelepiped shape in the longitudinal direction of the sprocket width direction and formed in a substantially rectangular shape along the longitudinal direction of the sprocket. The central protrusion 13 is coupled to the chain holding portion 21, and the upper surface of the central protrusion 13 forms a continuous single plane with the upper surface of the chain holding portion 21. In this case, the upper surface of the center protrusion portion 13 and the upper surface of the chain cloth sandwiching portion 21 are arranged orthogonally to the element tooth height direction. The front surface of the central protrusion 13 is formed as an inclined surface that is inclined downward toward the end (front end) of the engaging head portion 11. The front end portion of the center protrusion portion 13 is coupled to the ridge portion 15 disposed between the right and left engagement convex portions 14. The left and right side surfaces of the center protrusion portion 13 have flat side surfaces that are arranged substantially orthogonal to the element width direction. At the same time, the left and right side faces of the center protrusion portion 13 have curved faces formed on the flat side faces which are close to the rear end portions of the chain cloth sandwiching portion 21. This curved surface is formed to be curved toward the outer side in the sprocket width direction so as to be continuous with the step surface of the step portion 20 disposed between the meshing head portion 11 and the chain cloth sandwiching portion 21. Furthermore, the step surface of the step portion 20 is also the front surface of the chain cloth sandwiching portion 21. In this case, the step portion 20 between the engaging head portion 11 and the chain fabric holding portion 21 is attached to the fastener element 10 before the fastener tape 3 (that is, the fastener elements shown in FIGS. 1 to 4) In 10), they are disposed separately on the left and right sides of the center protrusion 13 and are arranged in the sprocket width direction. Further, the step surface of the step portion 20 (the front surface of the chain cloth sandwiching portion 21) is formed as an inclined surface or a curved surface which is inclined downward toward the front. The right and left engaging convex portions 14 are disposed so as to be forward of the center protruding portion 13 at a position where the convex portion distal end surface 14a of the engaging convex portion 14 is located, and are protruded from the flat plate portion 12 in a mountain shape. In the present embodiment, the heights of the right and left engaging projections 14 from the flat portion 12 are set to be slightly larger than the central projections 13. That is, the upper end of the engaging convex portion 14 is at least higher than the central protruding portion 13 in the side view of the fastener element 10 shown in FIG. That is, the upper end of the engaging convex portion 14 is disposed at least higher than the central protruding portion 13 in the side view of the fastener element 10 shown in FIG. Further, in the present invention, the height dimension of the engaging convex portion 14 from the flat plate portion 12 may be set to be the same as the height of the central protruding portion 13 from the flat plate portion 12, or slightly smaller than the central protruding portion 13. The size of the height from the flat portion 12. The right and left engaging convex portions 14 have a shape that is bilaterally symmetrical with respect to the center position in the sprocket width direction of the engaging head portion 11, and are arranged to be aligned with each other in the sprocket width direction. Further, the right and left engaging convex portions 14 are formed in the sprocket width direction, and are protruded from the left and right outer edges of the upper surface of the flat plate portion 12 at positions spaced apart inward. Therefore, on the outer side (i.e., the left side) of the engaging projection 14 on the left side and the outer side (i.e., the right side) of the engaging convex portion 14 on the right side, the flat upper surface of the flat plate portion 12 is further forward from the more engaging convex portion 14. The area of the square is distributed throughout the area extending to the rear. By thus forming the flat upper surface of the flat plate portion 12 on the outer side in the sprocket width direction of the right and left engaging convex portions 14, the strength of the engaging head portion 11 of the fastener element 10 can be appropriately ensured, and the fastener element 10 can be prevented. The feel of the hand is getting worse. The engaging convex portion 14 of the present embodiment has a convex portion distal end surface 14a disposed at a position farthest from the upper surface (or lower surface) of the flat plate portion 12 in the up and down direction; and a convex portion inclined surface 14b disposed at the convex portion The outer surface of the distal end surface 14a in the sprocket width direction; and the convex front surface 14c, the convex rear surface 14d, the convex inner side surface 14e, and the convex outer surface 14f, etc., so as to surround the convex portion in a plan view of the engaging head portion 11 The tip end surface 14a and the convex portion inclined surface 14b are disposed. In this case, the convex portion distal end surface 14a of the engaging convex portion 14 is formed by a flat surface that is orthogonally arranged with respect to the sprocket height direction. The convex portion inclined surface 14b is disposed between the convex portion distal end surface 14a of the engaging convex portion 14 and the convex portion outer side surface 14f, and is formed such that the engaging convex portion 14 is formed from the convex portion distal end surface 14a toward the outer side in the sprocket width direction. The inclined portion which is inclined downward from the flat portion 12 in such a manner that the height dimension thereof gradually decreases. In particular, in the present embodiment, the convex portion inclined surface 14b is formed by a flat surface that is linearly inclined downward toward the outside at a fixed ratio. Further, in the present invention, the convex inclined surface 14b may be formed by, for example, a curved surface which is inclined downward toward the outer side and whose inclination ratio is gradually increased. Further, in the present embodiment, as shown in Fig. 5, the convex inclined surface 14b is formed in such a manner that the dimension W1 in the sprocket width direction has the convex inner side surface 14e and the convex portion of the engaging convex portion 14. The outer side surface 14f has a size of 10% or more of the minimum width dimension W2 in the sprocket width direction. Thereby, the effect of preventing the meshing cracking which is exerted when the zipper 1 is bent into a U shape as described below can be further improved. The convex front surface 14c of the engaging convex portion 14 is disposed so as to be inclined downward toward the front from the front end edge of the convex end surface 14a and the convex inclined surface 14b to the flat plate portion 12. Further, the convex front surface 14c is formed by a slightly convex curved surface in the side view of the fastener element 10 shown in FIG. The convex rear surface 14d of the engaging convex portion 14 is formed by a flat surface that is inclined downward toward the rear from the end edge of the convex portion distal end surface 14a and the convex portion inclined surface 14b to the flat plate portion 12. The convex inner side surface 14e is disposed so as to rise from the outer edge portion of the ridge portion 15 in the sprocket width direction, and is directed downward from the inner edge of the convex end surface 14a to the ridge portion 15 toward the inner side in the sprocket width direction. It is formed by a flat surface that is inclined. The convex outer surface 14f of the engaging convex portion 14 is disposed so as to rise from the upper surface of the flat plate portion 12, and is laterally outward from the outer edge of the convex portion inclined surface 14b to the flat plate portion 12 toward the sprocket width direction. It is formed by a flat surface that is inclined downward. Furthermore, in the present invention, the convex front surface 14c, the convex rear surface 14d, the convex inner side surface 14e, and the convex outer surface 14f of the engaging convex portion 14 can be formed by a flat surface inclined with respect to the sprocket height direction. It can also be formed by a curved surface that is convexly curved outward. In the right and left engaging convex portions 14 in the present embodiment, as described above, the convex portion inclined surface 14b is provided on the outer side of the convex portion distal end surface 14a. Therefore, as shown in FIGS. 4 and 5, the front end edge formed by the convex end portion 14a of the engaging convex portion 14 and the outer side surface of the convex portion are viewed from the front side when the fastener element 10 is viewed from the front. A downward inclined portion formed by the convex inclined surface 14b which is inclined downward toward the outer edge is disposed between the outer side edges of 14f. Further, in the front view of the fastener element 10, an obtuse angle is disposed between the distal end edge formed by the convex distal end surface 14a of the engaging convex portion 14 and the inner edge formed by the convex inner surface 14e. The corner portion 14g of the shape. In this case, the angle of the corner portion 14g which becomes the obtuse angle refers to a portion (straight line portion) from the convex end surface 14a as indicated by an arrow when the fastener element 10 is viewed from the front side. The angle (inner angle) of the corner portion 14g up to the portion (straight line portion) of the convex inner side surface 14e. Further, in the present invention, a corner portion having a curved shape having a small radius of curvature such as chamfering may be disposed between the leading edge and the inner edge of the engaging convex portion 14 in the front view. That is, the distal end portion of the engaging convex portion 14 of the present embodiment has an outer end portion that is disposed on the outer side in the sprocket width direction and has a downward inclined portion of the convex portion inclined surface 14b in front of the fastener element 10; The inner end portion is disposed adjacent to the insertion groove portion 16 on the inner side in the sprocket width direction and is provided with an angular portion 14g. Therefore, in the front view of the fastener element 10, the distal end portion of the engaging convex portion 14 has a shape in which the outer end portion and the inner end portion are asymmetric with each other in the sprocket width direction. The raised portion 15 of the engaging head portion 11 is disposed at a central portion in the sprocket width direction of the flat plate portion 12 and in front of the center protruding portion 13, and is disposed by being sandwiched by the right and left engaging convex portions 14. The raised portion 15 is formed by bulging from the upper surface of the flat plate portion 12, and the upper surface of the raised portion 15 is disposed in parallel with the upper surface of the flat plate portion 12. Further, the front end portion of the raised portion 15 has a front surface which is inclined downward toward the front, and the front surface of the raised portion 15 is continuously formed with the convex front surface 14c of the right and left engaging convex portions 14. The rear end portion of the raised portion 15 is coupled to the center protruding portion 13. The left and right side edge portions of the raised portion 15 are connected to the left and right meshing convex portions 14, respectively. With the raised portion 15, the central projection 13 and the right and left engaging projections 14 can be reinforced. As a result, the meshing strength of the zipper 1 can be improved. Further, by forming the ridge portion 15 between the right and left engaging projections 14, the metal squeezing element 10 is punched out from the metal flat member, and the metal can be crushed. The amount of flow is suppressed to be less. Further, in the present embodiment, the height dimension of the raised portion 15 from the flat plate portion 12 is set to be 5% or more and 50% or less, preferably 10%, of the height dimension of the engaging convex portion 14 from the flat plate portion 12. Above and below 40%. By setting the height dimension of the raised portion 15 to 5% or more of the height dimension of the engaging convex portion 14, the strength of the central protruding portion 13 and the right and left engaging convex portions 14 can be effectively increased. Further, by setting the height dimension of the swelled portion 15 to 50% or less of the height dimension of the engaging convex portion 14, the zipper chain of the meshing target side can be formed when the zipper 1 is formed as follows and the right and left fastener elements 10 are engaged. The central protrusion 13 of the tooth 10 is stably inserted into the insertion groove portion 16 without interfering with the ridge portion 15. The insertion groove portion 16 provided between the right and left engagement projections 14 of the meshing head portion 11 is disposed above the ridge portion 15. When the slide fastener 1 is formed and the right and left fastener elements 10 are engaged, the insertion groove portion 16 is inserted into the space portion of the center projection portion 13 of the fastener element 10 on the engagement target side. The left and right insertion recesses 17 provided on the right and left sides of the center protrusion 13 of the meshing head portion 11 are disposed so as to be surrounded by the engagement projection 14, the center projection 13, and the chain cloth sandwiching portion 21. Further, the right and left insertion recesses 17 are formed to be open on the opposite side to the center projections 13, that is, in the width direction of the insertion recesses 17. In other words, the bottom surface of the insertion recess 17 and the flat upper surface of the flat plate portion 12 are continuous as the same flat surface. When the fastener element 1 is formed and the right and left fastener elements 10 are engaged, the insertion recesses 17 are respectively inserted into the space portions of the engaging convex portions 14 of the fastener element 10 on the meshing target side. Further, in the present embodiment, since the swelled portion 15 is provided in the engaging head portion 11, the height of the space portion which is the insertion groove portion 16 is smaller than the height of the space portion which is the left and right insertion recess portion 17. The height dimension of the space to be inserted into the groove portion 16 is the size from the height position of the convex portion distal end surface 14a of the engaging convex portion 14 to the height position of the upper surface of the raised portion 15. The height dimension of the space portion to be inserted into the recessed portion 17 is a dimension from the height position of the upper surface of the center protrusion portion 13 to the height position of the upper surface of the flat plate portion 12. In the meshing head portion 11 of the present embodiment, the minimum dimension of the sprocket width direction of the insertion groove portion 16 is set to be larger than or equal to the sprocket width direction of the upper surface of the central projection portion 13, preferably the central projection portion 13 The maximum size of the sprocket width direction is greater than or equal to. In addition, the minimum dimension of the sprocket width direction of the insertion groove portion 16 means the dimension of the sprocket width direction of the upper surface of the ridge portion 15. Moreover, in this case, the maximum dimension of the sprocket width direction of each of the right and left engaging projections 14 is set to be larger than the largest dimension of the sprocket width direction of the center projection 13. Further, the dimension in the sprocket width direction from the convex outer side surface 14f of the left engaging convex portion 14 to the convex outer surface 14f of the right engaging convex portion 14 is set to be relative to the corresponding sprocket length direction. The dimension of the upper plate portion 12 in the sprocket width direction (that is, the dimension in the direction of the sprocket width from the left outer edge to the right outer edge of the flat plate portion 12) is 50% or more and 95% or less, preferably 60. % or more and 90% or less. By setting the ratio to 50% or more, the strength of the right and left engaging projections 14 can be ensured, and the zipper 1 can be stably provided with an appropriate meshing strength. By setting the above ratio to 95% or less, the flat upper surface and the lower surface of the flat plate portion 12 can be stably formed on the outer side of the right and left engaging convex portions 14. The chain cloth clamping portion 21 of the fastener element 10 has a clamping base end portion 22 coupled to the meshing head portion 11 and a pair of left and right leg portions 23 which are branched from the clamping base end portion 22 to the left and right sides and The rear side extensions and the left and right fins 24 are bent inward from the rear end portions (end portions) of the respective leg portions 23 and further extend rearward. The upper surface and the lower surface of the chain cloth sandwiching portion 21 are formed by flat surfaces that are orthogonal to the direction of the sprocket height. Therefore, the dimension (height dimension) in the direction of the sprocket height between the upper surface and the lower surface of the chain fabric holding portion 21 is set to be a fixed size of the body of the chain nip portion 21. Furthermore, in the present invention, the anti-adhesive convex portion of the fastener element described in Patent Document 1 may be provided on the upper surface or the lower surface of the fastener fabric holding portion 21. The grip base end portion 22 of the chain cloth sandwiching portion 21 connects the meshing head portion 11 and the right and left leg portions 23. The height of the grip base end portion 22 is set to be larger than the height of the flat portion 12 of the engaging head portion 11. Further, the upper surface of the grip base end portion 22 is continuously disposed from the upper surface of the central projection portion 13 so as to form a single plane. The left and right leg portions 23 are formed symmetrically with respect to each other with respect to the center position in the sprocket width direction of the fastener element 10. The left and right leg portions 23 are in a state in which the fastener element 10 is attached to the fastener stringer 3, and the interval between the left and right leg portions 23 in the width direction of the fastener is gradually increased toward the rear, and the base portion is self-clamping. 22 extends in a direction inclined outward with respect to the longitudinal direction of the sprocket. In this case, the left and right side faces of the flat plate portion 12 of the engaging head portion 11, the left and right side faces of the grip base end portion 22, and the outer side faces of the left and right leg portions 23 are continuously disposed so as to form a single plane. The right and left fins 24 extend inward from the inner side surface of the distal end portion of the left and right leg portions 23, and are bent and extended in a direction substantially the same as the direction in which the leg portions 23 extend. Further, each of the left and right fin portions 24 has an inner side surface that is disposed to face each other and a side surface that is disposed on the opposite side of the inner side surface. In this case, the outer side surface of the fin portion 24 is disposed in parallel with the outer side surface of the leg portion 23. Further, the inner side surface of the fin portion 24 is disposed obliquely with respect to the outer surface of the fin portion 24 such that the dimension between the inner side surface and the outer side surface gradually decreases toward the end of the fin portion 24. In particular, in this case, the inclination angle θ of the inner side surface of the fin portion 24 with respect to the outer side surface is set to be 2° or more and 15° or less. By setting the above-described inclination angle θ to 2° or more, the effect of appropriately securing the flexibility of the fastener stringer 2 or the effect of ensuring the shaking of the fastener element 10 with respect to the fastener stringer 3 can be stably obtained as follows. Moreover, by setting the inclination angle θ to 15° or less, the strength of the fin portion 24 can be stably ensured. Furthermore, in the present invention, the fastener element 10 may be formed without providing the right and left fins 24. Next, a method of manufacturing the fastener element 10 of the present embodiment as described above will be described. First, a metal flat wire 30 is prepared (see Fig. 6). At this time, as the flat wire member 30, a thickness having a thickness equal to the height dimension of the chain cloth sandwiching portion 21 of the fastener element 10 is prepared. Then, the prepared flat wire 30 is carried into the extrusion molding step, and the flat wire 30 is extrusion-molded using a pair of upper and lower forming punches not shown. At this time, in the forming punch for extrusion molding, a pressing portion (not shown) that partially presses the flat wire member 30 to be plastically deformed is provided at the tip end portion. The pressing portion of the forming punch has a shape corresponding to the uneven shape of the engaging head portion 11 so that the shape of the engaging head portion 11 of the fastener element 10 can be formed on the front surface and the back surface of the flat wire member 30. Specifically, in the pressing portion of the forming punch, the shape of the left and right engaging convex portions 14 for forming the fastener element 10 is recessed in a specific position and shape corresponding to the position and shape of each portion of the fastener element 10. A pair of first recesses, a second recess that shapes the central projection 13 of the fastener element 10, and a third recess that shapes the raised portion 15 of the fastener element 10. In the present embodiment, the flat wire 30 is extruded by using such a forming punch, and as shown in FIG. 6, on the front and back sides of the flat wire 30, the length of the flat wire 30 is specified. The shape of the engaging head portion 11 is formed at a distance. At this time, by causing the engaging head portion 11 to have the above-described raised portion 15, the flow amount of the metal due to the pressing in the flat wire member 30 can be suppressed to be less than that in the case where the raised portion 15 is not provided, for example. . Thereby, the burden on the forming punch at the time of extrusion molding can be reduced. Further, the moldability of the extrusion molding can be improved, and the engagement projections 14 and the center projections 13 having a specific shape can be stably formed. Next, the portion of the flat wire 30 in which the engaging head portion 11 is formed is conveyed to the punching step, and the punching punch 40 having a specific shape as shown in Fig. 7 is used, and the flat wire 30 is formed with the engaging head. The specific part of the shape of 11 is punched. The punching punch 40 used in the present embodiment has a punch tip end portion 41 that is strongly contacted with a specific portion of the flat wire member 30 and subjected to shear processing. The tip end portion 41 of the punch is formed in such a manner that the outer shape of the tip end surface of the punch when viewed from below is the same as the outer shape of the fastener element 10 in the plan view of the fastener element 10. Further, the punch distal end portion 41 has a head side blanking portion 42a which is in contact with a portion of the flat wire member 30 which is the engaging head portion 11, and a nip portion punching portion 42b which is in contact with the flat wire member 30. Part of the cloth gripping portion 21. Further, a step portion corresponding to the step portion 20 of the fastener element 10 is provided between the head side blanking portion 42a and the nip portion punching portion 42b. In this case, the head side blanking portion 42a of the punch distal end portion 41 is provided at a specific position and shape in accordance with the position and shape of each portion of the fastener element 10, and is accommodated as a fastener element 10. The pair of left and right first recesses 43 of the portion of the engaging convex portion 14 , the second recess 44 that houses the portion of the central projection 13 of the fastener element 10 , and the third portion that accommodates the portion of the raised portion 15 of the fastener element 10 The recess 45. In this case, in the engaging head portion 11 of the fastener element 10 of the present embodiment, the upper surface (or lower surface) of the flat plate portion 12 is provided in front of the right and left engaging convex portions 14, the left and right outer sides, and the rear side. Therefore, in the punching punch 40 shown in FIG. 7, the flat surface 48 is continuously arranged so as to surround the front side, the left side outer side, and the rear side of the left and right first recessed portions 43. The flat surface 48 is a surface that is in contact with a portion of the flat wire member 30 that is the upper surface of the flat plate portion 12 when the flat wire member 30 is punched by the punching punch 40. Here, for the sake of comparison, for example, a case where the fastener element is punched out from the flat wire material, and the left and right meshing convex portions are extended to the left and right outer edges of the flat plate portion, and are disposed, for example, are described. The upper surface and the lower surface of the flat plate portion are not provided on the outer side in the sprocket width direction of the engaging convex portion. Further, the fastener element of the comparative example has the same form as the fastener element 10 of the present embodiment except that the upper surface and the lower surface of the flat plate portion are not formed on the outer side of the right and left engaging convex portions. The punching punch (cutting punch) 50 used for the manufacture of the fastener element of this comparative example has the head side punching part 52a and the nip part punching part 52b as shown in FIG. Further, the head-side blanking portion 52a is recessed with a pair of left and right first recesses 53 for accommodating the engaging projections 14, a second recess 54 for accommodating the central projections 13, and a third recess 55 for accommodating the ridges 15. However, in the punching punch 50 of the comparative example shown in FIG. 8, since the upper surface of the flat plate portion is not formed on the right and left outer sides of the engaging convex portion, the left and right first concave portions 53 are continuously recessed to the front end of the punch in the width direction. The left and right sides of the portion 51. Therefore, the flat surface 58 of the punch distal end portion 51 that is in contact with the upper surface of the flat plate portion is disposed apart from the front side and the rear side of the first concave portion 53, and is not formed as the punching punch 40 of FIG. The continuous surface of the first recess 53 is surrounded. As a result, the flat surface 58 disposed on the front side of the first concave portion 53 is formed to be elongated in the width direction. Therefore, the strength of the elongated front end portion 56 including the front flat surface 58 is weak. Therefore, when the flat wire 30 is repeatedly pressed and formed by the punching punch 50 of Fig. 8, the above-mentioned elongated front end portion 56 of the punching punch 50 is subjected to a large load. Therefore, for example, a portion of the imaginary line 59 shown in Fig. 8 is liable to be cracked, and the front end portion 56 is damaged or the like. As a result, there is a need to frequently replace the punching punch 50, so that the manufacturing steps of the fastener element are complicated, and the burden on the manufacturing cost of the fastener element is also increased. On the other hand, the punching punch 40 used in the present embodiment shown in FIG. 7 continuously arranges the flat surface 48 so as to surround the first recessed portion 43. In this way, the front end portion 46 of the punch front end portion 41 disposed before the first recess portion 43 and the side edge portion 47 disposed on the left and right outer sides of the first recess portion 43 are connected to each other so as to be continuous with each other. Therefore, the strength of each can be increased. Therefore, even if the flat wire 30 is repeatedly punched by the punching punch 40 of Fig. 7, the front end portion 46 or the side edge portion 47 of the head side punching portion 42a disposed at the tip end portion 41 of the punch is less likely to be damaged. . As a result, the frequency of replacement of the punching punch 40 can be reduced, so that the manufacturing steps of the fastener element 10 can be made more efficient or the manufacturing cost can be reduced. By using the punching punch 40 as described above, the specific portion of the flat wire 30 which has been subjected to extrusion molding is punched to form the fastener element 10 as shown in Figs. 1 to 4 . Further, the plurality of fastener element 10 formed from the flat wire 30 can be subjected to a polishing process by, for example, being introduced into a processing container (roller) to impart gloss to the fastener element 10. Further, in the present embodiment, the plurality of fastener elements 10 to be formed may be subjected to a coating process, a plating process, or the like. Thereby, the desired color can be imparted to the fastener element 10, and the appearance quality of the fastener element 10 can be improved, or the corrosion resistance of the fastener element 10 can be improved. The fastener element 10 of the present embodiment, which has been subjected to a polishing process or the like, is put into a component feeder (not shown), and the posture of the fastener element 10 is arranged, and then passed through a chute (not shown). It is supplied to the side edge portion of the fastener fabric 3 so as to sandwich the edge portion of the fastener fabric between the left and right leg portions 23 of the fastener element 10. Then, the left and right leg portions 23 of the fastener element 10 are pressed toward the fastener stringer 3 by a pressing device (not shown) by the fastener element 10 supplied to the side edge portion of the fastener fabric 3 to be plasticized. It is deformed so as to be attached to the side edge portion of the fastener fabric of the fastener stringer 3 one by one as shown in FIG. At this time, the left and right outer side surfaces of the grip base end portion 22, the outer side surfaces of the left and right leg portions 23, and the left and right fins in the chain cloth sandwiching portion 21 are plastically deformed by the left and right leg portions 23 of the fastener element 10 The outer surface of the portion 24 is arranged in parallel with the longitudinal direction of the sprocket. Further, the step portion 20 between the meshing head portion 11 of the fastener element 10 and the chain cloth sandwiching portion 21 is disposed on the outer side portion 20b with the outer side portion 20a of the step portion 20 with respect to the element width direction. It is arranged obliquely obliquely to the rear. Thereby, when the zipper 1 is formed as shown in FIG. 10 and the left and right sprocket rows 4 are engaged, the engaging convex portion 14 of each of the zipper elements 10 can more easily interfere with the fastener zipper of the zipper element 10 of the engaging object side. Holding part 21. As a result, the flexibility of the zipper 1 in the meshed state can be appropriately and stably ensured. Here, the outer side portion 20a and the inner side portion 20b of the step portion 20 are respectively referred to as the following portions. In other words, in each of the left and right step portions 20 disposed on the left and right sides of the center protrusion portion 13, the center portion in the width direction of the left or right step portion 20 is placed in the center in the width direction. The portion in which the portion is further biased to the left and right sides is referred to as the outer portion 20a, and the portion that is more inclined toward the central protrusion portion 13 than the central portion in the width direction is referred to as the inner portion 20b. Further, the fastener element 10 of the present embodiment has a pair of left and right fins 24. Therefore, when the fastener element 10 is attached to the fastener stringer 3, not only the left and right leg portions 23 of the fastener element 10 sandwich the fastener chain 3 from the front and back of the chain fabric, but also the left and right fins 24 are also self-propelled. The zipper chain cloth 3 is held in the back direction. Therefore, the mounting strength of the fastener element 10 with respect to the fastener stringer 3 can be improved. In particular, in this case, the inner side surface of the fin portion 24 is disposed obliquely at a specific angle with respect to the outer surface of the fin portion 24 as described above. Thereby, the left and right fins 24 of the fastener element 10 are suppressed from being excessively strongly sandwiched by the fastener stringer 3, and the flexibility of the fastener stringer 2 is impaired. Further, in the present embodiment, a plurality of fastener elements 10 are attached to the side edge portions of the fastener fabric 3 at a predetermined interval as described above, and a chain row is formed on the side edge portion of the fastener fabric. 4 zipper chain belt 2. Further, the two fastener tapes 2 are combined in a right and left set, and the sliders 5 are attached to the element rows 4 of the two fastener tapes 2. Thereafter, the first stopper 6 and the second stopper 7 are attached adjacent to both end portions of the element row 4. Thereby, the zipper 1 shown in Fig. 10 is manufactured. In the slide fastener 1 of the present embodiment manufactured in this manner, when the zipper 1 is viewed from the front side of the fastener fabric of the fastener tape 3 (or the back side of the fastener fabric), the engaging head of each of the fastener elements 10 can be seen. The side surface of the thin flat plate portion 11 is symmetrically protruded from the convex outer surface 14f of the engaging convex portion 14 on the upper surface and the lower surface of the flat plate portion 12, and the outer side surface of the chain cloth sandwiching portion 21. Therefore, the appearance of each of the fastener elements 10 of the slide fastener 1 shown in Fig. 10 can be similar to that of the fastener element 10 shown in Fig. 13 formed by molding, for example, as a "small mustard puppet". Further, in the fastener element 10 of the present embodiment, the flat upper surface and the lower surface of the flat plate portion 12 are disposed on the outer side in the sprocket width direction of the right and left engaging convex portions 14. With this, in the state in which the left and right fastener elements 10 are engaged, the zipper 1 is oriented in the longitudinal direction of the chain so that the portions of the fastener elements 10 disposed on the front side of the fastener are in close proximity to each other as shown, for example, in FIG. When the front side of the chain fabric is bent into a U shape, it is possible to prevent the occurrence of the engagement crack and stably bend to a smaller radius of curvature than before. Here, in FIG. 12, in order to perform the comparison, it is assumed that the upper surface and the lower surface of the flat plate portion 62 are not formed on the outer side in the sprocket width direction of the right and left engaging convex portions 64 as in the above-described Patent Document 2, for example. The zipper element 60 is made of a zipper. In the case of this comparative example, the right and left engaging projections 64 of the fastener element 60 are formed to extend in the sprocket width direction to the left and right side edges of the flat plate portion 62. Therefore, the tip end surface of the convex portion of the engaging convex portion 64 is also disposed from the center position in the sprocket width direction of the fastener element 60 to a position away from the outer side in the sprocket width direction. When the zipper of the comparative example of the fastener element 60 having such a shape is bent into a U shape in the longitudinal direction of the chain fabric in the longitudinal direction of the chain fabric, as shown in FIG. 12, the fastener element 60 is located in the curved shape. The distal end portion of the engaging convex portion 64 on the inner circumferential side (concave side) at the time of folding is likely to abut against the flat plate portion 62 of the fastener element 60 on the meshing target side. Further, when the engaging convex portion 64 of the fastener element 60 abuts against the flat plate portion 62 of the fastener element 60 on the meshing target side and interferes, the interference portion becomes a fulcrum, and the engaged left and right fastener elements 60 are separated from each other. The direction is rotated. As a result, the interval between the engaging convex portion 64 located on the outer peripheral side (the convex side) of the fastener element 60 and the flat plate portion 62 of the fastener element 60 on the meshing target side is greatly enlarged, and the state in which the right and left fastener elements 60 are engaged cannot be maintained. Therefore, the meshing and disengaging of the engaging and disengaging of the left and right zipper elements 60 occurs. On the other hand, in the slide fastener 1 of the present embodiment, the engaging convex portions 14 of the respective fastener elements 10 are disposed at a certain inner side apart from the outer edge of the flat portion 12. Further, a convex portion inclined surface 14b that is inclined downward toward the outside is provided at the distal end portion of the outer side of the engaging convex portion 14. Therefore, even when the left and right fastener elements 10 are engaged, the zipper 1 is bent into a U shape as described above, and as shown in FIG. 11, it is located on the inner peripheral side (concave side) of each of the fastener elements 10. The engaging convex portion 14 is less likely to abut (not easily interfere with) the flat plate portion 12 of the fastener element 10 on the meshing object side as compared with the case of the comparative example. As a result, the interval between the engaging convex portion 14 on the outer peripheral side (convex side) of the fastener element 10 and the flat portion 12 of the fastener element 10 on the meshing target side is less likely to expand as compared with the case of the comparative example. Therefore, the meshing state of the left and right fastener elements 10 can be stably maintained. Therefore, in the slide fastener 1 of the present embodiment, it is possible to stably bend the U-shape to a smaller radius of curvature without causing the engagement crack. As described above, the fastener element 10 of the slide fastener 1 of the present embodiment has a shape similar to the appearance of a "small mustard puppet" similar to the appearance of a fastener element formed by die casting. Further, since the fastener element 10 attached to the fastener stringer 3 can be subjected to a surface treatment such as a polishing treatment, it is possible to provide gloss, color, or the like which cannot be obtained by molding, or to improve corrosion resistance. Further, the slide fastener 1 of the present embodiment is a high-quality slide fastener 1 which is excellent in performance, that is, in a state in which the left and right fastener elements 10 are engaged, the U-shaped bent in the longitudinal direction of the fastener is small to a small value. The radius of curvature is also less likely to cause meshing cracking.

1‧‧‧ zipper
2‧‧‧Zipper chain
3‧‧‧Zipper chain cloth
4‧‧‧Chain row
5‧‧‧Sliding parts
6‧‧‧1st stop
7‧‧‧2nd stop
10‧‧‧zipper teeth
11‧‧‧Meshing head
12‧‧‧ Flat section
13‧‧‧Central protrusion
14‧‧‧Meshing convex
14a‧‧‧Top surface of the convex part
14b‧‧‧ convex slope
14c‧‧‧ front surface of the convex part
14d‧‧‧back surface of the convex part
14e‧‧‧ inside of the convex part
14f‧‧‧Outside of the convex part
14g‧‧‧ corner
15‧‧‧Uplift
16‧‧‧Insert slot
17‧‧‧Insert recess
20‧‧ ‧ step department
20a‧‧‧Outside
20b‧‧‧inside
21‧‧‧Chain Clamping Department
22‧‧‧Clamping base end
23‧‧‧ feet
24‧‧‧Fin
30‧‧‧flat wire
40‧‧‧punching punch
41‧‧‧The front end of the punch
42a‧‧‧ Head side punching
42b‧‧‧Clamping Department
43‧‧‧1st recess
44‧‧‧2nd recess
45‧‧‧3rd recess
46‧‧‧ front end
47‧‧‧ side edge part
48‧‧‧flat surface
50‧‧‧punching punch
51‧‧‧punch front end
52a‧‧‧ Head side punching
52b‧‧‧Clamping Department
53‧‧‧1st recess
54‧‧‧2nd recess
55‧‧‧3rd recess
56‧‧‧ front end
58‧‧‧flat surface
59‧‧‧ imaginary line
60‧‧‧zipper teeth
62‧‧‧ Flat section
64‧‧‧Meshing convex
70‧‧‧ zipper
71‧‧‧Zipper chain cloth
72‧‧‧zipper teeth
80‧‧‧zipper teeth
81‧‧‧Meshing head
82‧‧‧Chain Clamping Department
83‧‧ ‧ step department
84‧‧‧ Flat section
85‧‧‧ Central protrusion
86‧‧‧Meshing convex
W1‧‧‧Size of the sprocket width direction of the inclined surface of the convex part
W2‧‧‧Minimum width dimension of the sprocket width direction between the inner side of the convex part and the outer side of the convex part θ‧‧‧ Angle of inclination

Fig. 1 is a perspective view showing a fastener element of an embodiment of the present invention. Fig. 2 is a plan view showing the fastener element from the upper side of the element. Fig. 3 is a side view of the fastener element viewed from the side of the element side. Fig. 4 is a front view of the fastener element viewed from the front side of the element. Fig. 5 is an enlarged view showing an enlarged convex portion of a fastener element. Fig. 6 is an explanatory view schematically showing the steps of manufacturing the fastener element of the embodiment from the metal flat member. Figure 7 is a perspective view showing a portion of a punching punch for the manufacture of fastener elements. Fig. 8 is a perspective view showing a part of a punching punch of a comparative example. Fig. 9 is a partial cross-sectional view showing a state in which the fastener element of the embodiment is attached to a fastener stringer. Fig. 10 is a plan view showing the zipper having the fastener element of the embodiment as seen from the front side of the chain fabric. Fig. 11 is a cross-sectional view taken along the line XI-XI shown in Fig. 10 when the zipper of the embodiment is bent into a U shape in the longitudinal direction of the chain fabric. Fig. 12 is a cross-sectional view showing a state in which a zipper of a comparative example is bent into a U shape. Figure 13 is a plan view showing a zipper having a previous metal fastener element formed by die casting. FIG. 14 is a perspective view showing the fastener element described in Patent Document 2.

Claims (9)

A fastener element characterized in that it is a metal fastener element (10) having: an engagement head (11); and a chain cloth clamping portion (21), One end of the engaging head portion (11) extends rearward in the longitudinal direction of the sprocket; the engaging head portion (11) has a flat plate portion (12) which is further than the chain cloth holding portion (21) via a step portion ( 20) formed thinner; a central protrusion (13) protruding from a central portion of a width direction of a sprocket in an upper surface and a lower surface of the flat plate portion (12); and a pair of right and left engagement projections (14) And the protrusion is provided on the upper surface and the lower surface of the flat plate portion (12) at a position forward of the central protrusion portion (13); and the insertion groove portion is provided between the left and right engagement projection portions (14) (16); a left and right insertion recess (17) is provided between the left and right engagement projections (14) on the right and left sides of the central projection (13) and the chain nip (21); The engaging convex portion (14) is spaced apart from the left and right outer edges of the upper surface and the lower surface of the flat plate portion (12) toward the inner side in the sprocket width direction. And configuration. The fastener element of claim 1, wherein each of the left and right end portions of the engaging convex portion (14) has an outer end portion disposed on the outer side in the sprocket width direction, and is disposed adjacent to the insertion groove portion (16) The inner end portion of the inner side has an asymmetrical shape, and the outer end portion of the distal end portion has a height dimension that gradually decreases from the flat plate portion (12) toward the outer side in the sprocket width direction. The inclined portion (14b). The fastener element according to claim 2, wherein a corner portion (14g) is disposed between a distal end edge and an inner edge of the engagement convex portion (14) when the left and right engagement projections (14) are viewed from the front, and The inclined portion (14b) of the outer end portion is inclined downward toward the outer edge between the distal end edge and the outer edge of the engaging convex portion (14), and has the engaging convex portion in the sprocket width direction ( 14) is disposed such that the minimum width dimension between the inner edge and the outer edge is 10% or more. The fastener element according to any one of claims 1 to 3, wherein the engaging head portion (11) has a surface disposed between the left and right engaging projections (14) and from the upper surface of the flat plate portion (12) and the above The raised portion (15) of the lower surface ridge is connected to the central protrusion (13) and the left and right engagement projections (14). The fastener element of claim 1 or 2, wherein the chain cloth clamping portion (21) has a clamping base end portion (22) coupled to the engaging head portion (11); and left and right foot portions (23), The branching and extending from the clamping base end portion (22); and the left and right fin portions (24) are bent inward from the end portions of the respective leg portions (23) and extend rearward; the left and right fin portions (24) having inner side surfaces facing each other and outer side surfaces disposed opposite to the inner side surface; the inner side surface of the fin portion (24) is opposite to the outer side surface of the fin portion (24) The dimension between the inner side surface and the outer side surface is inclined so as to gradually decrease toward the end of the fin portion (24). The fastener element of claim 5, wherein the outer side surface of the fin portion (24) is disposed in parallel with the outer side surface of the leg portion (23). The zipper element of claim 5, wherein an inclination angle of the inner side surface of the fin portion (24) with respect to the outer side surface is set to be 2° or more and 15° or less. A fastener chain belt characterized in that a plurality of the above-mentioned fastener elements (10) according to any one of claims 1 to 7 are attached to a side edge portion of a fastener fabric (3). The fastener stringer of claim 8, wherein the step portion (20) of the fastener element (10) is disposed on the left and right outer portions (20a) of the step portion (20) with respect to the element width direction. It is inclined further rearward than the inner side portion (20b) of the step portion (20).