Die and notch forming apparatus for fastener notch forming

Abstract

The present invention aims to provide a notch-forming mold for fasteners and a notch-forming apparatus for fasteners, which can help reduce the amount of residue adhering to the mold and the strip, thereby increasing the commercial value of the fasteners. A notch-forming mold made of a thermomeltable raw material is provided for fasteners that join a pair of strips together by the engagement of chain teeth. The mold (20) has a base and a notch-forming portion (202) protruding from the base (201), and a stepped portion (203) between the base (201) and the notch-forming portion (202). The mold (20) also has a heater for heating to a temperature required to thermally melt the strip. The notch-forming portion has a pointed shape with a width that decreases towards the front end from the base.

Description

Technical Field

[0001] The present invention relates to a die for forming notches for fasteners and an apparatus for forming notches for fasteners. Background Technology

[0002] In this manual, "fasteners" refers to so-called wire fasteners, formerly known as zippers. Since they are now simply called fasteners, the term "fasteners" will also be used in this manual.

[0003] A zipper has a pair of straps, teeth that connect the straps by the engagement of the heads, and a slider that engages or disengages the teeth by sliding.

[0004] Zippers are widely used in clothing and also extensively in the production of industrial products. For example, in vehicle seat manufacturers, fasteners are used to join seat materials together. One side of the zipper tape is sewn onto the edge of the material to be joined, and the other side is sewn onto the edge of the material to be joined. By sliding the zipper pull and engaging the teeth of both tapes, the seat materials can be joined together.

[0005] Patent document 1 discloses the technology related to seat covers for such vehicles.

[0006] When sewing the fastener tape to the edge of the raw material to be bonded, the relative positional relationship between the raw material and the tape is crucial. Accurate alignment is time-consuming, and skilled operation is required for efficient work. Furthermore, fasteners used in the production of industrial products demand efficient sewing operations and aesthetically pleasing finished products.

[0007] Conventional methods involve affixing marks to the edges of the fastener's strap and the material to be bonded together, and aligning these marks with each other for mutual positioning. The number of marks and the spacing between them are determined by the user, with both fixed and irregular intervals possible. Furthermore, there are cases where only one side of the strap is marked, and cases where marks are alternately applied to one side and the other side.

[0008] In the aforementioned examples, the following situations exist: if the markings on the tape are rubbed with a finger or similar object, the paint on the markings will spread across the tape due to friction, or paint may adhere to the material side of the fastener to be bonded. If the fastener is used for seat covers in vehicles such as automobiles, paint adhering to the seat cover will detract from its aesthetics and commercial value. If care is taken to prevent paint from adhering to the material side of the fastener while bonding it, a decrease in work efficiency will result.

[0009] Prior art literature

[0010] Patent documents

[0011] Patent Document 1: Japanese Patent No. 6111982 Summary of the Invention

[0012] (The problem that the invention aims to solve)

[0013] The applicant previously filed a patent application (Japanese Patent Application 2019-103597) for a notch forming device for fasteners, which is formed by hot melting of a strip made of a thermomeltable raw material to serve as a positioning mark during installation.

[0014] According to the invention disclosed in the patent application, mutual alignment can be achieved by aligning the notch of the belt with the markings on the raw material to which the fastener is to be bonded. The notch of the belt differs from markings made with paint or the like, thus preventing the belt from becoming soiled. However, it is understood that the invention disclosed in the patent application has technical problems that require further improvement. (See reference...) Figure 14 , Figure 15 This technical issue will be explained.

[0015] Figure 14 Examples of molds used in the invention covered by the patent application are shown. For example... Figure 14 As shown, the mold 120 has a wedge-shaped triangular planar shape. A core material 121 is bonded to the upper surface of the mold 120. A heater is installed on the core material 121, which, together with the core material 121, heats the mold 120.

[0016] Mold 120 is an upper mold with three corners, one of which has a V-shaped cut that embeds into the lower mold. One of the corners of mold 120 is pressed against... Figure 15 If the band 2 of the fastener shown is embedded in the V-shaped cut of the mold on the lower side, a portion of the band 2 will be thermally melted by the heat of the mold 120, forming a V-shaped notch 17 in the band 2.

[0017] If the mold 120 described in the patent application is used to form a notch in the band 2 of the fastener, it can be seen that a portion of the mold 120 is covered with residue 123 from the melted band 2 (see reference). Figure 14 Residue 123 adheres to a portion of the bottom surface and a portion of the side surface of the mold 120 that are in contact with the strip 2. Additionally, as... Figure 15 As shown, residue 123 from the melting of strip 2 adheres to the periphery of the notch 17 on side 2, damaging the appearance of strip 2. If residue 123 adheres to mold 120, then when a notch is formed on another strip 2, residue 12 adheres to the periphery of the notch, damaging the appearance of strip 2.

[0018] When the notch 17 is formed in the belt 2 by the hot melting based on the mold 120, about 80% of the hot-melted portion becomes gas and diffuses into the air or permeates into the belt 2. The remaining about 20% becomes solid residue 123 and adheres to the mold 120 and the belt 2.

[0019] The object of the present invention is to provide a notch forming mold for fasteners and a notch forming apparatus for fasteners that are designed to reduce the amount of residue adhering to the mold and the strip and to increase the commercial value of the fasteners.

[0020] (Technical solutions used to address the problem)

[0021] The present invention relates to a notch-forming mold for fasteners, wherein a pair of belts are joined together by the engagement of chain teeth. The notch-forming mold is for forming notches in the belts of the fasteners made of thermomeltable raw materials. The notch-forming mold has a base and a notch-forming portion that partially protrudes from one side of the base, and a stepped portion between the base and the notch-forming portion. The notch-forming mold also has a heater that heats the belt to a temperature required to thermomelt it. The notch-forming portion has a pointed shape with a width that decreases towards the front end from the base.

[0022] Regarding the notch-forming apparatus for fasteners that relates to the present invention, the fasteners joining a pair of strips by the engagement of chain teeth, the notch-forming apparatus is a notch-forming apparatus for the strips of the fasteners made of thermomeltable raw materials, the notch-forming apparatus comprising: a mold that is pressed against the strips of the fasteners to form a notch in the strips; and a mold moving mechanism that presses the heated mold against the strips of the fasteners, the mold being the notch-forming mold for the fasteners described above.

[0023] (Invention effect)

[0024] According to the present invention, the volume of the notch forming portion is smaller than the volume of the mold base, and even if the notch forming is repeated, the heat supply from the base to the notch forming portion can be sufficiently ensured relative to the heat consumption generated by the notch forming. Therefore, the raw material of the strip in contact with the notch forming portion is rapidly heated, melted, and diffused, and the amount of residue adhering to the notch forming portion and the periphery of the notch formed by the strip is small, thus maintaining an aesthetically pleasing appearance of the fastener. Attached Figure Description

[0025] Figure 1 This is a top view showing an example of a fastener that can be obtained using the notch forming mold for fasteners and the notch forming apparatus for fasteners according to the present invention.

[0026] Figure 2 This is a top view showing an embodiment of a notch-forming mold for fasteners according to the present invention.

[0027] Figure 3 This is a perspective view of one embodiment of the notch-forming mold.

[0028] Figure 4 This is a top view showing an example of another mold used with the notch-forming mold.

[0029] Figure 5 This is the front view of the other mold.

[0030] Figure 6 This is a front view showing an embodiment of the notch forming apparatus for fasteners according to the present invention.

[0031] Figure 7 This is a partial cross-sectional front view of an example of the notch-forming mold used in the notch-forming apparatus and the heater included with the mold.

[0032] Figure 8 This is a partial cross-sectional front view of the notch-forming action of the notch-forming mold and the other mold.

[0033] Figure 9 The front view of the notch forming device is shown together with an example of a control system.

[0034] Figure 10 This is a top view showing the notch formation process using the notch forming apparatus.

[0035] Figure 11 This is another embodiment of the notch-forming mold for fasteners that relates to the present invention, (a) is a perspective view and (b) is a front view.

[0036] Figure 12 This is a perspective view showing another embodiment of the mold for forming notches in fasteners that relates to the present invention.

[0037] Figure 13 It means to utilize Figure 12 A side view of the notch formation process using a mold, as shown.

[0038] Figure 14 Examples of notch-forming molds for fasteners from the applicant’s previous patent application are shown, (a) being a front view and (b) being a top view.

[0039] Figure 15 It means through Figure 14A top view showing an example of a notch formed on the band of a fastener using a mold for forming notches for fasteners. Detailed Implementation

[0040] Hereinafter, embodiments of the notch-forming mold for fasteners and the notch-forming apparatus for fasteners according to the present invention will be described with reference to the accompanying drawings.

[0041] Example 1

[0042] [Examples of fasteners]

[0043] Figure 1 This illustrates an example of a fastener with a notch formed using the notch-forming mold and notch-forming apparatus for fasteners described in this invention. Figure 1 In this fastener 1, the main components include a pair of belts 12, chain teeth 13 arranged along one side edge of each belt 12, and a pull head 14. The belts 12 are made of thermoplastic raw materials, such as polyethylene, polyvinyl chloride, polyester, nylon, or other resins. The pair of belts 12 are joined together by engaging the heads of the chain teeth 13 of each belt. The engagement and disengagement of the chain teeth 13 are achieved by sliding the pull head 14 along the chain teeth 13.

[0044] The placement range of the chain teeth 13, i.e. the sliding range of the pull head 14, is limited by the lower stop 15 and the upper stop 16. The lower stop 15 is installed across a pair of parallel belts 12, connecting the pair of belts 12. The upper stop 16 is installed on each of the pair of belts 12.

[0045] Multiple notches 17 are formed on the outer edges of a pair of belts 12 along their length. Each notch 17 is a V-shaped notch that converges inward toward the width direction of the belt 12. In the illustrated embodiment, the same number of V-shaped notches 17 are formed on each belt 12 and at the same position along the length direction in each belt 12. The multiple notches 17 along the length direction of each belt 12 are spaced differently from each other.

[0046] The notch 17 serves as a mark when sewing one side of the raw material and the other side of the raw material to be joined together by the fastener 10, respectively, with the tip of the V-shaped notch 17 aligned with the center of the mark on the raw material on the opposite side.

[0047] The number of notches 17 formed in a band 12 can be arbitrary, or there can be only one. The position of the notches 17 can be different on one side of the pair of bands 12, and the spacing of the notches 17 can also be different on one side of the pair of bands 12. The notches 17 can also be formed only on one side of the pair of bands 12. The shape of the notches 17 is not limited to V-shape; for example, it can be a semi-circular cut or recess, or it can be a hole.

[0048] Based on the fastener example described above, by sewing the strip 12 to the raw material on the opposite side using the notch 17 as a marker, the fastener 10 can be positioned and installed with high precision. Even if the surface of the strip 12 is rubbed during fastener installation, the surface coating or other materials are not soiled, thus maintaining the appearance of the raw material on the opposite side where the fastener is installed and improving the operability of fastener installation.

[0049] [An embodiment of a mold for forming notches in fasteners]

[0050] Next, an embodiment of a mold for forming notches for fasteners, used to obtain fasteners as described above, will be described. Figures 2 to 5 This illustrates an embodiment of a mold for forming notches in fasteners.

[0051] exist Figure 2 , Figure 3 In this mold 20, there is a base 201 and a notch-forming portion 202 protruding from the base 201. When viewed from above, i.e., from top view, the base 201 is trapezoidal, and the notch-forming portion 202 protrudes outward from a portion of the shorter side of the mutually parallel planes of the trapezoid. Therefore, a step portion 203 is provided between the base 201 and the notch-forming portion 202, and when viewed from above, the width of the notch-forming portion 202 is narrower than the width of the forming edge of the notch-forming portion 202 on the base 201.

[0052] The notch forming portion 202 has a pointed shape whose width continuously decreases from the base 201 towards the front end, and its planar shape is the same as that of the notch 17, which is V-shaped. The lower end of the core material 24 is bonded to the upper surface of the base 201, and the outer periphery of the core material 24 extending upward from the base 201 is... Figure 7 The heater 22 is shown as covering the mold 20. The heating structure of the mold 20 utilizing the heater 22 will be explained in detail later.

[0053] Figure 4 , Figure 5The lower mold 30 is generally flat, and the fastener 10 is mounted on its upper surface. V-shaped cutouts 31 for inserting the mold 20 are formed at both edges of the lower mold 30 along its length. At least a portion of the pointed end of the cutouts 31 at both edges of the lower mold 30 is covered by a pair of bands 12 of the fastener 10. In this state, recessed portions 202 of the mold 20 are respectively arranged opposite to each cutout 31 of the lower mold 30. When the mold 20 is lowered, the recessed portions 202 engage with the cutouts 31 while the bands 12 are thermally melted. In other words, the mold 20 is a male mold, and the lower mold 30 is a female mold into which the recessed portions 202 of the mold 20 are inserted.

[0054] The mold 20 moves vertically along the central axis of the core material 24 via the mold moving mechanism described later. The notch forming portion 202 is pressed against the strip 12 on the lower mold 30, and then engages with the cutout 31 of the lower mold 30 as described above. The notch forming portion 202 protrudes from the base 201 in a direction orthogonal to the pressing direction of the mold 20 pressing the strip 12, and the movement trajectory of the mold 20 is set in such a way that the base 201 does not contact the strip 12.

[0055] The mold 20 is heated by the heater 22. The notch forming portion 202 of the mold 20 contacts the belt 12 of the fastener 10, thereby forming a V-shaped notch 17 in the belt 12 by thermal melting, which is the same as the notch forming portion 202.

[0056] like Figure 6 , Figure 7 As shown, the lower end of the core material 24 is bonded to the upper surface of the base 201 of the mold 20, and the outer periphery of the core material 24 extending upward from the mold 20 is covered by the heater 22. The core material 24 and the heater 22 are connected by fastening screws 26. The heater 22 has a heating element based on electricity such as heating wire, and the heat energy generated by the heater 22 is transferred from the base 201 of the mold 20 to the notch forming portion 202 via the core material 24. Power is supplied to the heater 22 from a power source 28, such as a commercial AC power source.

[0057] exist Figure 6 In the example shown, there are five mold units consisting of mold 20, core material 24, and heater 22, supported by support body 34. Each mold unit moves up and down via a mold moving mechanism with actuators, and the five molds 20 move up and down as a result of the up and down movement of each mold unit. Fasteners 10 are placed on the lower mold 30, and the five molds 20 descend from above it, with the notch forming part 202 of each mold 20 respectively fitting into the cutout 31 of the lower mold 30.

[0058] Figure 8This indicates that the notch 202 of a mold 20 is embedded in a cut 31 of a lower mold 30. The mold 20 is preheated by supplying power from a power source 28 to a heater 22. The power source 28 is, for example, a 100V AC power source, and the power consumption of the heater 22 is, for example, about 25W. Through a structure similar to that of a soldering iron, the temperature of the mold 20 is heated to about 280°C or higher.

[0059] The notch-forming portion 202 of the heated mold 20 clamps the strip 12 of the fastener 10 between it and the lower mold 30. The strip 12 is made of a thermoplastic material, and thus melts to form the shape of the notch-forming portion 202 of the mold 20. The notch-forming portion 202 is embedded in the cutout 31 of the lower mold 30, thereby forming a notch 17 in the strip 12 that conforms to the shape of the notch-forming portion 202. Most of the melted portion of the strip 12 becomes gas and diffuses, while a portion melts into the strip 12.

[0060] [Effects obtained through an embodiment of a notch-forming mold]

[0061] One feature of an embodiment of the notch-forming mold described above is that it has a base 201 and a notch-forming portion 202 protruding from the base 201, and a stepped portion 203 between the base 201 and the notch-forming portion 202. Furthermore, the mold 20 has a heater 22 for heating to a temperature required to thermally melt the band 12 of the fastener 10, and the notch-forming portion 202 has a pointed shape whose width decreases towards the front end from the base 201.

[0062] According to one embodiment of the notch-forming mold with relevant features, the volume of the base 201 is sufficiently large relative to the volume of the notch-forming portion 202. Therefore, when the notch 17 is formed on the band 12 of the fastener 10, the heat retained by the base 201 is much greater than the heat consumed by the notch-forming portion 202, and the temperature drop of the mold 20 due to the formation of the notch 17 is minimal, thus stably maintaining the temperature of the mold 20 at an appropriate temperature.

[0063] After the notch forming portion 202 of the mold 20 comes into contact with the belt 12, the belt 12 conforms to the shape of the notch forming portion 202 and is melted. Most of the raw material of the melted belt 12 diffuses as gas. The remaining portion of the melted raw material of the belt 12 becomes residue and adheres to the notch forming portion 202 and the belt 12. As described above, the temperature drop of the mold 20 due to the formation of the notch 17 is minimal, and the temperature of the mold 20 is stably maintained at an appropriate level. Therefore, the amount of residue adhering to the notch forming portion 202 and the belt 12 is minimal. Consequently, there is less contamination from residue on the notch forming portion 202 of the mold 20 and the belt 12, resulting in a cleaner finishing of the fastener 10.

[0064] Because it can suppress dirt caused by residue on the notch forming portion 202 of the mold 20, even if the notch 17 is formed repeatedly, the amount of residue adhering to the notch forming portion 202 transferred to the belt 12 is small, which can reduce the labor required for regular cleaning and maintenance of the mold 20. Since the heat consumption generated by the formation of the notch 17 is small, the electrical power consumed by the mold 20 can be reduced.

[0065] Since the belt 12 is heat-melted to conform to the shape of the notch forming portion 202 immediately after the notch forming portion 202 of the mold 20 comes into contact with the belt 12, the cut 31 of the lower mold 30 does not necessarily correspond to the shape of the notch forming portion 202 of the mold 20. For example, the cut 31 of the lower mold 30 can be made larger than the projected area of ​​the notch forming portion 202 to avoid the notch forming portion 202. Therefore, the lower mold 30 only needs to be able to hold the fastener and apply a certain degree of tension to the belt 12 of the fastener and hold it, and it does not necessarily need to have the function of a mold.

[0066] [Mold Moving Mechanism]

[0067] Figure 9 This section illustrates a specific example of a mold moving mechanism that causes multiple molds 20 to move up and down, and an example of its control system. Figure 9 In this design, the mold moving mechanism is supported by a support body 34. The support body 34 has a base 38, multiple support columns 37 rising from the base 38, and beams 36 supported by the upper ends of each support column 37. A lower mold 30 is fixed on the base 38. An actuator 32 that moves the upper mold unit containing the mold 20 up and down is supported by the beams 36. Figure 9 In the example shown, there are 4 upper mold units and 4 actuators 32 that move each upper mold unit up and down respectively.

[0068] exist Figure 9 In this example, actuator 32 is a cylinder. The mold moving mechanism is connected to power supply 28 and compressed air source 50, which are connected to control box 40 within the mold moving mechanism. The mold moving mechanism has a temperature sensor 54 that detects the temperature of the mold 20. Control box 40 controls the power supplied to the heaters 22 of each mold 20 to maintain the temperature of the mold 20 detected by temperature sensor 54 within a given range.

[0069] In the mold moving mechanism, operation switches 56 are installed at both ends of the base 38. By operating the operation switches 56, the control box 40 supplies compressed air to the actuators 32, which are composed of cylinders, causing each mold 20 to descend and form a notch 17 in the band 12 of the fastener as described above. Afterwards, if the operation switches 56 are turned off, each actuator 32 causes each mold 20 to rise, ending a series of notch forming operations.

[0070] Figure 10 This illustrates an example of a fastener 10 with a notch 17 formed by a notch forming apparatus and a configuration example of a mold unit having the mold 20 for forming the notch 17. Figure 10 In the fastener 10, a plurality of notches 17 are formed on both sides of a pair of straps 12 constituting the fastener 10.

[0071] [Another embodiment of a die for forming notches in fasteners]

[0072] Figures 11 to 13 This illustrates another embodiment of the mold for forming notches in fasteners that relates to the present invention. Figure 2 , Figure 3 In the embodiment of the notch-forming mold shown, the upper and lower surfaces of the base 201 of the mold 20 and the notch-forming portion 202 are respectively on the same plane, and the lower surface of the notch-forming portion 202, that is, the end face of the side opposite to the band 12 of the fastener 10, becomes a plane. Even with such a structure, the initial effect can be obtained as described above. Figures 11 to 13 Another embodiment of the notch-forming mold shown is designed to achieve a more desirable effect.

[0073] Figure 11 The embodiment of the notch-forming mold shown is an example in which the notch-forming portion 202 of the mold 20 has a pointed end edge 204 on the lower side opposite to the band 12 of the fastener 10, and inclined surfaces with different inclination directions are formed on both sides. According to this embodiment of the notch-forming mold, when the mold 20 is pressed toward the band 12 of the fastener 10, the pointed end of the lower side of the notch-forming portion 202 first contacts the band 12, and heat is locally applied to the band 12 from the front end. The band 12 begins to melt from the part that contacts the pointed end of the lower side of the notch-forming portion 202, and the melted part begins to open by cracking under the appropriate tension of the band 12. As the mold 20 descends, the melting of the band 12 continues, and a notch 17 corresponding to the projection plane in the planar direction from the front end side of the notch-forming portion 202 is formed in the band 12.

[0074] Thus, according to Figure 11 In the embodiment of the notch-forming mold shown, the notches 17 formed based on the pointed shape of the lower side of the notch-forming portion 202 are formed sequentially. The heat consumption of the notch-forming portion 202 occurs along with time, and a large amount of heat is not consumed instantaneously. Therefore, even if a large number of notches 17 are formed continuously, the temperature of the mold 20 will not decrease, and the amount of residue adhering to the notch-forming portion 202 and the band 12 due to the melting of the band 12 can be reduced.

[0075] Figure 12 The embodiment of the notch-forming mold shown is a further improvement. Figure 11An example of mold 20 is shown. Figure 12 In the mold 20 shown, the lower edge 204 of the notch forming portion 202 of the mold 20, which faces the band 12 of the fastener 10, is pointed. The edge 204 is inclined in a direction that rises from the base 201 side toward the front end of the notch forming portion 202. Furthermore, the edge 204 is cut off at the front end of the notch forming portion 202 along an inclined line toward the upper side of the front end of the notch forming portion 202.

[0076] The lower edge 204 of the notch-forming portion 202 becomes the pointed edge 205. The portion after cutting off the edge 204 along an inclined line towards the upper front end of the notch-forming portion 202 also becomes the pointed edge 206. In other words, the notch-forming portion 202, from its bottom to its upper front end surface, is composed of continuous pointed edges 205 and 206. The pointed edge 206 can be as follows: Figure 12 , Figure 13 As shown in the example, it can be along a curve, or it can be along a straight line.

[0077] according to Figure 12 The embodiment of the notch-forming mold shown can, in addition to obtaining, the same as... Figure 11 In addition to the same effects as the illustrated embodiment, the tip-shaped end edge 204 becomes an inclined surface that rises from the base 201 side toward the front end of the notch forming portion 202, thereby achieving the following effects. That is, as Figure 13 As shown, as the mold 20 descends, the contact positions of the notch forming portion 202 with respect to the belt 12 advance sequentially in a point-contact manner. Therefore, it is possible to further reduce the heat consumption of the notch forming portion 202 per unit time, suppress the temperature drop of the mold 20 caused by the formation of the notch 17, and reduce the amount of residue adhering to the notch forming portion 202 and the belt 12 due to the thermal melting of the belt 12.

[0078] [Example of a notch-forming device]

[0079] In the initial stage of fastener manufacturing, a pair of teeth (chain teeth) are continuously manufactured in an interlocking manner and wound onto a spool or similar device. To make the fastener usable in this initial manufacturing stage, a given number of teeth are removed at given intervals using a tooth removal device, thus determining the functional parts of the fastener. Furthermore, by installing a lower stop, a pull head, and an upper stop, and partially cutting the strip after tooth removal, a usable fastener is manufactured.

[0080] The notch-forming apparatus for fasteners according to the present invention can also be installed in the aforementioned chain tooth removal apparatus, and automatically form a notch during or after the chain tooth removal process. With this configuration, notches can be formed efficiently.

[0081] [Effects obtained according to embodiments of the notch forming apparatus of the present invention]

[0082] In embodiments of the notch-forming apparatus of the present invention, a notch is formed on the fastener band as a mark of position when the fastener is installed. Unlike conventional paint marks that are attached as marks of fastener installation position, the notch does not soil the fastener or the parts to which the fastener is installed due to friction. Therefore, the quality of products using fasteners with notches formed by the notch-forming apparatus of the described embodiment is not compromised.

[0083] The notch forming apparatus of the present invention includes the aforementioned notch forming mold, and thus can obtain the effects described in the embodiments concerning the notch forming mold.

[0084] This invention allows for arbitrary design changes without departing from the technical concept of the invention as described in each of the claims. For example, in Figure 2 , Figure 3 , Figures 11-13 In the embodiment of the mold shown, when viewed from above, the stepped portion 203 and the side surface of the notch forming portion 202 intersect with a clear boundary, but the stepped portion 203 and the side surface of the notch forming portion 202 can also be drawn as an arc while remaining continuous. The angle formed by the stepped portion 203 and the side surface of the notch forming portion 202 is arbitrary.

[0085] (Label Explanation)

[0086] 10 Fasteners

[0087] 12 belts

[0088] 13 Chain teeth

[0089] 14 Pull-out

[0090] 17 Notch

[0091] 20 molds

[0092] 22 Heaters

[0093] 201 matrix

[0094] 202 Notch Forming Part

[0095] 203 Steps

[0096] 204 Front edge.

Claims

1. A notch-forming mold for a fastener, the fastener joining a pair of strips by the engagement of chain teeth, the notch-forming mold being a notch-forming mold for the strip of the fastener made of a thermoplastic material. The notch-forming mold has a base and a notch-forming portion protruding from the base, and a stepped portion between the base and the notch-forming portion. The notch-forming mold also includes a heater, which heats the material to the temperature required to melt it. The notch forming portion has a pointed shape with a width that decreases towards the front end of the substrate, and the volume of the substrate is larger than the volume of the notch forming portion.

2. The die for forming a notch in a fastener according to claim 1, wherein, The notch forming portion protrudes from the substrate in a direction orthogonal to the pressing direction of the notch forming mold pressing the strip.

3. The die for forming a notch in a fastener according to claim 1, wherein, The end of the notch forming part of the notch forming mold that is opposite to the strip has a pointed shape.

4. The die for forming a notch in a fastener according to any one of claims 1 to 3, wherein, The notch-forming portion of the notch-forming mold is the end opposite to the belt, and the tip portion of the notch-forming mold is obliquely cut off from the base towards the front end.

5. The die for forming a notch in a fastener according to claim 4, wherein, The portion that is cut at an angle is cut along a straight line or curve and is in the shape of a pointed tip.

6. A notch-forming device for a fastener, the fastener joining a pair of strips by the engagement of chain teeth, the notch-forming device being a notch-forming device for the strip of the fastener made of a thermomeltable raw material. The notch forming apparatus has: The mold is pressed against the band of the fastener to form a notch in the band; and The mold moving mechanism presses the heated mold onto the band of the fastener. The mold is a notch-forming mold for fasteners as described in any one of claims 1 to 5.

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