Zip pull production device for sportswear

Abstract

This invention relates to the field of zipper-related accessories, specifically to a production apparatus for a pull tab of a sportswear zipper. The apparatus is characterized by: a frame, on which are mounted an unwinding roller for conveying the pull cord, an injection mold with an injection cavity, and several guide wheels for guiding the pull cord. The injection mold has a separable upper injection mold and a lower injection mold. The frame is equipped with a pressing mechanism for fixing the free end of the pull cord, and a pull-out mechanism for pulling the pull cord out in a direction perpendicular to its conveying direction. When the pull cord is pulled out, it is located between the upper and lower injection molds, forming a first cord end and a second cord end. When the upper and lower injection molds are closed, the first and second cord ends are embedded within the injection mold cavity. The frame is also equipped with a metal strip conveying and unwinding mechanism, and a stamping die is mounted on the frame outside the injection mold and near the input end of the pull cord.

Description

[0001] This application is a divisional application of patent application number 202110863325.2, filed on July 29, 2021, entitled "A method and apparatus for producing a zipper pull for sportswear". Technical Field

[0002] This invention relates to the field of zipper-related accessories, specifically to a device for producing zipper pulls for sportswear zippers. Background Technology

[0003] Zipper pull tabs are typically formed from metal pieces with openings into which the zipper pull is installed. These metal pieces are often too small to allow the zipper to slide smoothly; therefore, many manufacturers attach a larger cord to the end of existing zipper pulls, as shown in Chinese patent CN2415646Y, a cord-type zipper pull consisting of a cord and a pull body. The pull body is a two-tone flat body with a concave center and raised strips at the top and bottom of the concave portion. The cord is fixed to the upper part of the pull body. This illustrates the basic structure of existing pull tabs with cords.

[0004] As shown in CN 110384314 A, a zipper pull tab includes: a connecting body capable of being connected to a zipper head, and a pull tab body integrally mounted on the connecting body. The connecting body includes: an exposed portion protruding from the pull tab body, and an embedded portion embedded in the pull tab body. The pull tab body includes: a first forming portion made of resin, which includes at least one or more annular ends capable of surrounding the end of the embedded portion adjacent to the exposed portion and having an opening; and a second forming portion made of resin, which is formed on the first forming portion such that the embedded portion is disposed in the middle. The first forming portion and the second forming portion are integrally formed (in one piece).

[0005] In this invention, when the pull tab body is integrally mounted to the connecting body, firstly, the end of the embedded portion adjacent to the exposed portion in the connecting body is surrounded by the annular end of a pre-formed first forming portion. Next, with the embedded portion positioned in the middle, resin is injection molded into this first forming portion to form a second forming portion. Thus, a pull tab body including the first and second forming portions into which the embedded portion of the connecting body is embedded is formed, and the pull tab is completed. During the injection molding of the second forming portion, the annular end is positioned at the end of the cavity of the molding die of the second forming portion, i.e., the end of the cavity of the connecting body adjacent to the exposed portion, and the end of the embedded portion of the connecting body adjacent to the exposed portion is surrounded by the annular end at the end of this cavity. The opening of the annular end is set to a size such that the annular end surrounds the end of the embedded portion of the connecting body adjacent to the exposed portion as closely as possible without gaps. In this state, a second forming part is formed by injecting molten resin into the cavity of the molding mold. The first forming part and the second forming part are integrated with the embedded part disposed therebetween to form a pull tab body. The annular end is retained as the end of the pull tab body adjacent to the exposed part of the connecting body.

[0006] It demonstrates a molding method with a resin-based structural pull tab.

[0007] However, existing zipper pulls, especially those used in sportswear, have the following problems:

[0008] 1. Due to production limitations, the connection between the pull cord and the pull tab in resin-made pull tab structures is inconsistent, resulting in uneven positions of the two ends of the pull cord on the pull tab, which affects the product's appearance.

[0009] Second, the existing production process is of poor quality, and the pull rope and pull plate are prone to separation.

[0010] Third, resin pull tabs are lightweight and lack the texture of metal pull tabs, affecting the feel when pulling them.

[0011] Currently, it is not possible to efficiently produce the aforementioned pull-tablet products. Summary of the Invention

[0012] Therefore, the present invention provides a production device for zipper pulls of sportswear, which solves the problem that existing resin-made zipper pulls cannot be produced efficiently.

[0013] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0014] A method for producing a zipper pull tab for sportswear includes the following steps:

[0015] a. Take a continuous conveying rope and set up an injection mold with an injection cavity;

[0016] b. Fix the end of the continuously conveying pull rope;

[0017] c. A pull-out mechanism is provided to pull out the rope in the direction perpendicular to its conveying direction and form a first rope end and a second rope end, which fall into the injection mold cavity.

[0018] d. The injection mold is used to form the rope end fixing part, and the first rope end and the second rope end are embedded in the formed rope end fixing part;

[0019] e. A cutting mechanism is set on the side near the input end of the pull rope to cut and separate the formed rope end fixing part from the continuously conveyed pull rope, forming a single pull piece;

[0020] f. Then the rope continues to convey the material, and steps b, c, and d above are repeated to achieve continuous production of the sheet.

[0021] Preferably, the step between steps c and d above further includes:

[0022] c1. Take a continuously conveyed metal strip and set a stamping mold in front of the injection mold. The pull-out mechanism pulls out the pull rope and passes it through the stamping cavity of the stamping mold.

[0023] c2. The metal strip is stamped to cover the outer surfaces of the first rope end and the second rope end to form a rope end fixing piece;

[0024] c3. The pull-out mechanism continues to operate, pulling the first rope end and the second rope end, which are stamped and have rope end fixing pieces, into the injection mold cavity of the injection mold.

[0025] Preferably, in step c3 above, the pull-out mechanism pulls the rope end fixing piece to be fully embedded into the injection mold cavity of the injection mold or to partially extend the rope end fixing piece out of the rear end of the injection mold cavity.

[0026] Preferably, step e is followed by step e1: after forming a single pull tab, the pull-out mechanism continues to pull the single pull tab backward to achieve demolding and collection.

[0027] A production apparatus for producing pull tabs of sportswear zippers according to the above-described method includes a frame, on which are provided an unwinding roller for conveying the pull cord, an injection mold having an injection cavity, and a plurality of guide wheels for guiding the pull cord. The injection mold has an upper injection mold and a lower injection mold that can be separated vertically. The frame is provided with a pressing mechanism for fixing the free end of the pull cord, and a pulling mechanism for pulling the pull cord out in a direction perpendicular to its conveying direction. When the pull cord is pulled out, it is located between the upper injection mold and the lower injection mold, forming a first cord end and a second cord end. When the upper injection mold and the lower injection mold are closed, the first cord end and the second cord end are embedded in the injection mold cavity. A cutting mechanism is provided on the side of the frame where the pull cord enters the injection mold for cutting the pull cord after injection molding to separate it into individual pull tabs.

[0028] Preferably, the frame is provided with a metal strip conveying and unwinding mechanism, and a stamping die is provided on the frame located outside the injection mold and near the input end of the pull rope. After the pull rope is pulled by the pull-out mechanism, it passes through the mold cavity of the stamping die. The metal strip conveying and unwinding mechanism conveys the metal strip into the stamping die and the stamping die processes it to form a rope end fixing piece for fixing the pull rope.

[0029] Preferably, the stamping die has an upper stamping die and a lower stamping die that can be separated from each other. The forming surfaces of the upper stamping die and the lower stamping die are two arc-shaped surfaces connected in sequence, so that the metal strip forms an open "∞" ring structure after being acted upon by the stamping die.

[0030] Preferably, the pull-out mechanism includes a telescopic rod, a drive motor and transmission assembly adapted to the telescopic rod, and a mechanical claw located at the end of the telescopic rod for gripping the pull rope.

[0031] Preferably, the cutting mechanism includes a cutting cylinder with a vertical output direction and a high-temperature cutting blade installed at the output end of the cutting cylinder.

[0032] By adopting the aforementioned technical solution, the beneficial effects of the present invention are:

[0033] This technical solution is designed based on the structure of the corresponding pull tab product. It sets up a pull-out mechanism perpendicular to the direction of the pull cord conveying, in conjunction with a corresponding injection mold and cutting mechanism, to achieve the purpose of automated production of pull tabs with pull cords. Compared with the traditional combined pull tab structure, its production process is fully automated, reducing labor costs and improving production efficiency. At the same time, the product has strong consistency and a better appearance, allowing clothing and other products using this pull tab product to maintain consistency. Attached Figure Description

[0034] Figure 1This is a top-view structural diagram of an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of another state of the structure from a top view according to an embodiment of the present invention;

[0036] Figure 3 This is a structural schematic diagram from the main view direction of an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of the structure of the pull tab in an embodiment of the present invention;

[0038] Figure 5 for Figure 4 Schematic diagram of radial cross-sectional structure of the middle tension plate;

[0039] Figure 6 This is a schematic diagram of another structural pull tab in an embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram of another structural pull tab in an embodiment of the present invention.

[0041] Figure Descriptions: 1. First rope end; 2. Second rope end; 3. Rope end fixing part; 31. Groove; 32. Protrusion; 33. Arc-shaped groove; 34. Anti-slip texture; 4. Rope end fixing piece; 5. Reflective sheet; 100. Frame; 101. Pressing mechanism; 200. Injection mold; 201. Upper injection mold; 202. Lower injection mold; 203. Injection mold cavity; 300. Stamping mold; 301. Upper stamping mold; 302. Lower stamping mold; 303. Stamping mold cavity; 304. Arc-shaped surface; 400. Pull-out mechanism; 401. Telescopic rod; 402. Drive motor; 403. Mechanical claw; 500. High-temperature cutter; A. Pull rope; B. Metal strip. Detailed Implementation

[0042] The following will describe in detail the implementation of the present invention with reference to specific embodiments, so that the process of how the present invention uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0043] Example

[0044] refer to Figure 1 , Figure 2 and Figure 3 A method for producing a zipper pull tab for sportswear includes the following steps:

[0045] a. Take a continuous conveying rope and set an injection mold 200 with an injection cavity 203;

[0046] b. Fix the end of the continuously conveying pull rope;

[0047] c. A pull-out mechanism 400 is provided to pull out the rope in the direction perpendicular to its conveying direction and form a first rope end 1 and a second rope end 2, which fall into the injection mold cavity 203.

[0048] d. The injection mold 200 performs injection molding to form the rope end fixing part 3, and the first rope end 1 and the second rope end 2 are partially embedded in the formed rope end fixing part 3;

[0049] e. A cutting mechanism is set on the side near the input end of the pull rope to cut and separate the formed rope end fixing part 3 from the continuously conveyed pull rope, forming a single pull piece;

[0050] f. Then the rope continues to convey the material, and steps b, c, and d above are repeated to achieve continuous production of the sheet.

[0051] Meanwhile, in production, after step e above, step e1 is also included: after a single pull piece is formed, the pull-out mechanism 400 continues to pull the single pull piece backward to achieve demolding and collection; in this way, simply adding one stroke to the pull-out mechanism 400 can accomplish different production functions.

[0052] This technical solution is designed based on the structure of the corresponding pull tab product. It sets up a pull-out mechanism 400 perpendicular to the direction of the pull cord conveying, in conjunction with a corresponding injection mold 200 and a cutting mechanism, to achieve the purpose of automated production of pull tabs with pull cords. Compared with the traditional combined pull tab structure, its production process is fully automated, reducing labor costs and improving production efficiency. At the same time, the product has strong consistency and a better appearance, allowing clothing and other products using this pull tab product to maintain consistency.

[0053] In addition, the steps between c and d above also include:

[0054] c1. Take a continuously conveyed metal strip and set a stamping mold 300 in front of the injection mold 200. The pull-out mechanism 400 pulls out the pull rope and passes it through the stamping cavity 303 of the stamping mold 300.

[0055] c2. The metal strip is stamped to cover the outer surfaces of the first rope end 1 and the second rope end 2 to form a rope end fixing piece 4.

[0056] c3. The pull-out mechanism 400 continues to operate, pulling the first rope end 1 and the second rope end 2, which are stamped and have rope end fixing pieces 4, into the injection mold cavity 203 of the injection mold 200.

[0057] Simultaneously, in step c3 above, the pull-out mechanism 400 pulls the rope end fixing piece 4 to be fully embedded into the injection mold cavity 203 of the injection mold 200, or causes a portion of the rope end fixing piece 4 to extend beyond the rear end of the injection mold cavity 203, such as... Figure 4 , Figure 5 , Figure 6 , Figure 7 This shows three different pull-tab product structures.

[0058] Meanwhile, this technical solution utilizes the corresponding device, which can be found in the following references. Figure 1 , Figure 2 and Figure 3 A production apparatus according to the above-described method for producing pull tabs of sportswear zippers includes a frame 100. The frame 100 is equipped with an unwinding roller for conveying the pull cord, an injection mold 200 having an injection cavity 203, and a plurality of guide wheels for guiding the pull cord. The injection mold 200 has a separable upper injection mold 201 and a lower injection mold 202. The frame 100 is equipped with a pressing mechanism 101 for fixing the free end of the pull cord. The frame 100 is also equipped with a mechanism for conveying the pull cord along its conveying direction. A pull-out mechanism 400 is provided in the vertical direction of the pull rope. When the pull rope is pulled out, it is located between the upper injection mold 201 and the lower injection mold 202, forming a first rope end 1 and a second rope end 2. When the upper injection mold 201 and the lower injection mold 202 are closed, the first rope end 1 and the second rope end 2 are embedded in the injection mold cavity 203. A cutting mechanism is provided on the side frame 100 on the side where the pull rope enters the injection mold 200 to cut the pull rope after injection through the injection mold 200 to separate it into individual pull pieces.

[0059] In this embodiment, a metal strip conveying and unwinding mechanism is provided on the frame 100. A stamping die 300 is provided on the frame 100 located outside the injection mold 200 and near the input end of the pull rope. After the pull rope is pulled by the pull-out mechanism 400, it passes through the mold cavity of the stamping die 300. The metal strip conveying and unwinding mechanism conveys the metal strip into the stamping die 300 and the stamping die 300 processes it to form a rope end fixing piece 4 for fixing the pull rope.

[0060] In this embodiment, the stamping die 300 has an upper stamping die 301 and a lower stamping die 302 that can be separated from each other. The forming surfaces of the upper stamping die 301 and the lower stamping die 302 are two arc-shaped surfaces 304 connected in sequence, so that the metal strip forms an open "∞" ring structure after being acted upon by the stamping die 300.

[0061] In this embodiment, the pull-out mechanism 400 includes a telescopic rod 401, a drive motor 402 adapted to the telescopic rod 401 and a transmission assembly, and a mechanical claw 403 located at the end of the telescopic rod 401 for gripping the pull rope.

[0062] In this embodiment, the cutting mechanism includes a cutting cylinder with a vertical output direction and a high-temperature cutting blade 500 installed at the output end of the cutting cylinder.

[0063] Accordingly, this technical solution illustrates the relevant product structure of the output:

[0064] refer to Figure 4 and Figure 7 A pull tab for a sportswear zipper includes a pull cord with a first cord end 1 and a second cord end 2, wherein the first cord end 1 or the second cord end 2 passes through a zipper head to connect with the zipper head (the specific structure of the zipper head is not shown in the figure).

[0065] A resin rope end fixing part 3 for fixing the first rope end 1 and the second rope end 2;

[0066] A rope end fixing piece 4 is embedded in the rope end fixing part 3 and keeps the first rope end 1 and the second rope end 2 flat, wherein the rope end fixing piece 4 is made of metal.

[0067] The rope end fixing piece 4 has an open "∞" ring structure, which clamps the first rope end 1 and the second rope end 2 therein; specifically, the rope end fixing part 3 has a cylindrical structure, and the first rope end 1 and the second rope end 2 are fixed to the axial ends of its cylindrical structure.

[0068] This technical solution adopts a structure with a rope end fixing piece 4. Firstly, it can fix the positions of the two ends of the pull rope that are difficult to position. Secondly, during injection molding, the rope end fixing part 3 keeps the positions of the first rope end 1 and the second rope end 2 in place, so that the position shifts due to the expansion and contraction of the material itself or the vibration of the machine are less likely to occur, which would cause the positions of the two rope ends to shift and affect the overall aesthetics of the pull piece.

[0069] Secondly, the first rope end 1 and the second rope end 2 are pre-clamped by the rope end fixing piece 4, and then injection molded together with the rope end fixing part 3 to form an integral part, making the connection structure more stable and preventing the situation where a single rope end on the pull rope separates from the rope end fixing part 3.

[0070] Third, adding a rope end fixing piece 4 can slightly increase the mass of the entire pull piece, but it will not be as rigid as a metal pull piece. It retains the wear-resistant, non-slip and easy-to-pull characteristics of the resin material, while increasing the weight when pulling and improving the overall texture of the pull piece.

[0071] In this embodiment, a groove 31 is provided on the surface of the rope end fixing part 3; the structure of the groove 31 increases the recessed structure on the outer surface of the rope end fixing part 3, making it more conducive to anti-slip and pulling; it also provides conditions for adding functional structures in the groove 31 later; specifically, a reflector 5 is embedded in the groove 31; adding the reflector 5 can increase the reflective effect on the rope end fixing part 3, which is both practical and improves the aesthetic effect.

[0072] In this embodiment, the length of the rope end fixing piece 4 embedded in the rope end fixing part 3 is 4 / 5 of its length; however, depending on the production weight requirements and raw materials, this length ratio can be adjusted to be within the range of 1 / 2 to 4 / 5. The weight of the entire pull piece can be adjusted by varying the width of the rope end fixing piece 4; when it occupies 4 / 5 of the length of the rope end fixing part 3, the weight distribution is more even, preventing one end from being heavier.

[0073] In this embodiment, the rope end fixing piece 4 is embedded in the rope end fixing part 3; thus, in appearance, it is not much different from the traditional pull piece structure with a pull rope, but it can achieve the effect of increasing the weight and enhancing the pulling feel.

[0074] At the same time, such as Figure 1 As shown, the rope end fixing piece 4 has a certain compression effect on the pull rope during production. In this way, when the rope end fixing part 3 is formed, a corresponding connecting surface with an irregular cross-section can be formed on the outer surface of the pull rope that is embedded therein. The connection between the two is more stable and can withstand greater tension.

[0075] Also refer to Figure 6 Compared with the above structure, a pull tab structure with a different shape is designed. Specifically, the rope end fixing part 3 is a long strip structure with a rounded rectangular cross-section. Its upper and lower end faces are provided with protrusions 32 and arc grooves 33 for easy finger pulling. This structure improves the convenience and anti-slip properties when pulling.

[0076] In order to enhance this effect, the rope end fixing part 3 is provided with anti-slip texture 34 on the side away from the first rope end 1 and the second rope end 2. Specifically, the anti-slip texture 34 is provided on the outer surface of the protrusion 32.

[0077] The internal structure needs to be improved accordingly. Specifically, the rope end fixing piece 4 is embedded between the end of the rope end fixing part 3 and the arc groove 33. This reduces the width of the rope end fixing piece 4, but also reduces the amount of resin used in the resin structure behind it, thereby reducing the weight of the rope end fixing part 3 where the rope end fixing piece 4 is not located, and can also maintain the uniformity of weight to a certain extent.

[0078] Also refer to Figure 7 Compared with the above structure, another structure was designed, specifically, the rope end fixing piece 4 is partially embedded in the rope end fixing part 3; this structure is to ensure that the first rope end 1, the second rope end 2 and the rope end fixing part 3 are tightly connected, to avoid the separation of the connection between the first rope end 1 and the second rope end 2, and to avoid the situation where the pull rope separates from the resin rope end fixing part 3.

[0079] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A device for producing zipper pulls for sportswear, characterized in that: The device includes a frame (100), on which are provided an unwinding roller for conveying a pull rope, an injection mold (200) having an injection cavity (203), and a plurality of guide wheels for guiding the pull rope. The injection mold (200) has a separable upper injection mold (201) and a lower injection mold (202). The frame (100) is provided with a pressing mechanism (101) for fixing the free end of the pull rope, and a pull-out mechanism for pulling the pull rope out in a direction perpendicular to its conveying direction. The mechanism (400) is located between the upper injection mold (201) and the lower injection mold (202) when the pull rope is pulled out, forming a first rope end and a second rope end. When the upper injection mold (201) and the lower injection mold (202) are closed, the first rope end and the second rope end are embedded in the injection mold cavity (203). A metal strip conveying and unwinding mechanism is provided on the frame (100). A stamping mold (300) is provided on the frame (100) located outside the injection mold (200) and near the input end of the pull rope. After being pulled by the pull-out mechanism (400), the pull rope passes through the mold cavity of the stamping die (300). The metal strip conveying and unwinding mechanism conveys the metal strip into the stamping die (300) and processes it to form a rope end fixing piece (4) for fixing the pull rope. After the pull-out mechanism (400) pulls the rope end fixing piece (4) out of the stamping die (300), 1 / 2 to 4 / 5 of the length of the rope end fixing piece (4) is embedded in the injection mold cavity (203).

2. The apparatus for producing pull tabs for sportswear zippers according to claim 1, characterized in that: The stamping die (300) has an upper stamping die (301) and a lower stamping die (302) that can be separated from each other. The forming surfaces of the upper stamping die (301) and the lower stamping die (302) are two arc-shaped surfaces (304) connected in sequence, so that the metal strip forms an "∞" ring structure with an opening after being acted upon by the stamping die (300).

3. The apparatus for producing pull tabs for sportswear zippers according to claim 1, characterized in that: A cutting mechanism is provided on the side frame (100) where the pull rope enters the injection mold (200) to cut the pull rope after it has been injected through the injection mold (200) and separate it into individual pull pieces.

4. The apparatus for producing pull tabs for sportswear zippers according to any one of claims 1-3, characterized in that: The pull-out mechanism (400) includes a telescopic rod (401), a drive motor (402) adapted to the telescopic rod (401) and a transmission assembly, and a mechanical claw (403) located at the end of the telescopic rod (401) for gripping the pull rope.

Images