Auxiliary sewing device for elastic trouser waist

Abstract

The utility model relates to the technical field of sewing machine auxiliary devices, and mainly discloses an elastic trouser waist auxiliary sewing device which comprises a base, a table top and an overedger head, and the table top is provided with a notch and a plurality of groups of adjustable roller mechanisms. A guide rail is installed on the first support, the second support bears the first roller and the second roller, the third support is connected with the fourth roller through a connecting rod, the fourth support is provided with the fifth roller through a four-connecting-rod mechanism, and the negative pressure waste collecting system is arranged below the cutter side. Precise adjustment of the distance and the height of the rollers is achieved through the adjustable connecting rod, a working face is kept clean in cooperation with high-pressure pneumatic waste collection, the problem that manual sewing tension is not uniform is effectively solved, and the trouser waist sewing quality and efficiency are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the technical field of sewing machine auxiliary devices, specifically an elastic waistband auxiliary sewing device. Background Technology

[0002] The waistband, as the upper opening of trousers, is a key structural component connecting the trousers to the waist. Its core function is to adaptively adjust to fit the waist curve through built-in elastic materials (such as elastic bands). A typical waistband consists of two layers of fabric wrapped around an elastic band. These three layers (outer fabric, elastic band, and inner fabric) must be sewn together simultaneously using an overlock stitching process to form a uniformly elastic ring-shaped drawstring structure. This special construction places dual technical requirements on the sewing process: ensuring that the elastic band remains evenly stretched throughout the sewing process, and ensuring that the inner and outer fabrics are smoothly covered without wrinkles.

[0003] As the core equipment for this process, the overlock sewing machine's unique multi-thread chain stitch effectively locks the fabric edges, preventing the elastic band from slipping off. In traditional operations, operators manually place the elastic band within the fabric layer of the waistband and simultaneously stretch the elastic band and fabric with both hands, feeding it into the overlock sewing machine under tension. This operating mode presents the following technical bottlenecks in actual production:

[0004] The uniformity of force applied manually is difficult to guarantee. The operator must manually maintain the tension of the elastic band throughout the sewing process. The worker needs to stretch the elastic band to a certain length before sewing it to the binding fabric, applying even force while ensuring straight stitching. This requires considerable practical experience. Furthermore, the continuous application of force by human muscles is susceptible to fatigue, leading to significant differences in tension across different sections of the elastic band. Especially when handling highly elastic materials, uneven force can directly cause localized looseness or excessive tightness in the waistband of the sewn trousers, severely impacting wearing comfort and product consistency.

[0005] The aforementioned technical defects have led to problems such as unstable quality and high rework rate in the traditional waistband sewing process, which has restricted the standardization of trouser production. Utility Model Content

[0006] This invention provides an auxiliary sewing device for elastic waistbands. By selecting different roller groups to match the appropriate waistband size, and utilizing adjustable connecting rods, the distance and height of the rollers can be precisely adjusted. Combined with high-pressure pneumatic waste collection, the working surface is kept clean. This device effectively solves the problem of uneven tension in manual sewing, significantly improving the quality and efficiency of waistband sewing.

[0007] To achieve the above objectives, this utility model adopts the following technical solution: an elastic waistband auxiliary sewing device, comprising a base, a table, and an overlock sewing machine head. The table is positioned above the base, and the overlock sewing machine head is mounted above the table. An overlock sewing machine sewing platform is provided on one side of the overlock sewing machine head, and an overlock sewing machine needle is positioned above the overlock sewing machine sewing platform. A cutter is provided on one side of the overlock sewing machine needle. A notch is provided on the table, and a first support is provided in front of the overlock sewing machine sewing platform. A guide rail is provided above the first support. A first roller and a fourth roller are respectively arranged behind and in front of the guide rail. A second roller and a third roller are arranged side by side at the bottom of the sewing table of the overlock sewing machine. A fifth roller is arranged below the third roller and the fourth roller. The first roller, the second roller, the third roller, the fourth roller and the fifth roller are all arranged in the notch of the table. A waste collection cylinder is arranged below the side of the cutter. The waste collection cylinder is connected to the waste conveying pipe. The middle section of the waste conveying pipe is connected to the high-pressure pipe. The high-pressure pipe is connected to the high-pressure air source.

[0008] With the above technical solution, when using this device to sew waistbands, the appropriate roller is selected according to the size of the waistband. For smaller sizes, the first and fourth rollers are used; for medium sizes, the first, second, third, and fourth rollers are used; and for larger sizes, the first, fourth, and fifth rollers are used. A high-pressure air source creates negative pressure inside the waste conveying pipe, thereby conveying the waste falling into the waste collection cylinder to the designated location.

[0009] A further aspect of this invention is that the first roller and the second roller are mounted on a second support, and the second support is mounted within a notch in the table surface.

[0010] A further aspect of this invention is that the third roller is mounted on a third support, and the third support is mounted within a notch in the table surface.

[0011] A further aspect of this invention is that one end of the third bracket is pivotally connected to one end of the first connecting rod, and the fourth roller is installed at the other end of the first connecting rod. By adjusting the first connecting rod, the distance between the first roller and the fourth roller can be adjusted, thereby allowing for fine-tuning of the dimensions.

[0012] A further aspect of this invention is that one end of the third bracket is pivotally connected to one end of the first connecting rod through an elongated hole.

[0013] A further aspect of this invention is that the fifth roller is installed at one end of the third connecting rod, the third connecting rod is pivotally connected to one end of the second connecting rod, the other end of the second connecting rod is pivotally connected to the fourth bracket, and the fourth bracket is installed in the notch of the table.

[0014] A further aspect of this invention is that the fourth support is provided with an elongated hole, and the other end of the second connecting rod is pivotally connected to the elongated hole of the fourth support. The third connecting rod is also provided with an elongated hole, and one end of the second connecting rod is pivotally connected to the elongated hole of the third connecting rod. By adjusting the posture and position of the third and second connecting rods, the height and horizontal position of the fifth roller can be adjusted, thereby accommodating the sewing of various sizes of trouser waistbands.

[0015] A further aspect of this invention is that the switch for the high-pressure gas source is controlled by a foot switch.

[0016] A further aspect of this invention is that adjusting rings are provided on the first and fourth rollers. By adjusting the position of the adjusting rings on the first and fourth rollers, the running trajectory of the waistband is made consistent with the guide rail.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention provides an auxiliary sewing device for elastic waistbands. This device achieves standardized waistband sewing operations through a multi-roller collaborative layout. The combined design of rollers of different sizes can precisely adapt to various waistband specifications, effectively eliminating the problem of uneven tension caused by manual stretching. The adjustable linkage mechanism allows for rapid adjustment of the roller spacing and height, significantly improving equipment adaptability. An integrated negative pressure waste collection system can simultaneously remove thread ends and fabric scraps during sewing, keeping the work surface clean. This device simplifies the operation process while ensuring that the elastic band and fabric remain in a uniform fit, greatly reducing the rework rate. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the overall structure of the auxiliary sewing device of this utility model;

[0021] Figure 2 This is a front view of the auxiliary sewing device of this utility model;

[0022] Figure 3 This utility model Figure 2 A cross-sectional view along the AA direction.

[0023] In the diagram: 1. Base; 2. Tabletop; 3. Overlock machine head; 4. Overlock machine sewing table; 5. Notch; 6. First support; 7. Guide rail; 8. Second support; 9. First roller; 10. Second roller; 11. Third support; 12. Third roller; 13. First connecting rod; 14. Fourth roller; 15. Fourth support; 16. Second connecting rod; 17. Third connecting rod; 18. Fifth roller; 19. Waste collection cylinder; 20. Waste conveying pipe; 21. High-pressure pipe; 22. Foot switch; 23. Adjusting ring; 24. Overlock machine needle; 25. Cutting knife. Detailed Implementation

[0024] like Figure 1-3 As shown, an elastic waistband auxiliary sewing device includes a base 1, a table 2, and an overlock sewing machine head 3.

[0025] The tabletop 2 is positioned above the base 1, and a notch 5 is provided on the tabletop 2. The notch 5 is U-shaped, and the overlock sewing machine head 3 is installed on the right rear side of the notch 5 above the tabletop 2.

[0026] The overlock sewing machine head 3 used in this embodiment is a commercially available Pegasus brand model EX5114-03. The overlock sewing machine head 3 includes a needle mechanism, a looper mechanism, and a stitch forming device. The needle uses a vertical reciprocating motion to pierce the fabric, while the looper is positioned behind the needle and swings horizontally. Together, they form a chain stitch. During stitch formation, the thread on the needle penetrates the fabric and interweaves with the bobbin thread carried by the looper. The stitch tension is adjusted by the take-up lever, ultimately forming a multi-thread chain structure covering the fabric edge. The cutter 25 assembly is located to the side of the needle and is used to simultaneously cut the raw edges of the fabric. Its structure and working principle are known in the prior art and are not protected by this patent, so they will not be described further. An overlock sewing machine table 4 is provided on one side of the overlock sewing machine head 3. The overlock sewing machine needle 24 is positioned above the overlock sewing machine table 4, and a cutter 25 is provided on one side of the overlock sewing machine needle 24.

[0027] A first support 6 is provided in front of the sewing table 4 of the overlock sewing machine, and a guide rail 7 is provided above the first support 6. The guide rail 7 has a "︺" shaped cross-section, and the guide rail 7 is connected to the top of the first support 6 through an elongated hole and bolts. The waistband is located in the groove of the guide rail 7 during operation, and the position of the guide rail 7 is adjusted according to the width of the waistband.

[0028] A first roller 9 and a fourth roller 14 are respectively arranged behind and in front of the guide rail 7. A second roller 10 and a third roller 12 are arranged side by side at the bottom of the overlock sewing machine table 4. A fifth roller 18 is arranged below the third roller 12 and the fourth roller 14. The first roller 9, the second roller 10, the third roller 12, the fourth roller 14 and the fifth roller 18 are all arranged in the notch 5 of the table surface 2.

[0029] Specifically, the first roller 9 and the second roller 10 are mounted on the second support 8, which is installed on the right rear side of the notch 5 in the table surface 2. The third roller 12 is mounted on the third support 11, which is installed on the right middle side of the notch 5 in the table surface 2. One end of the third support 11 is pivotally connected to one end of the first connecting rod 13, and the fourth roller 14 is mounted on the other end of the first connecting rod 13. By adjusting the first connecting rod 13, the distance between the first roller 9 and the fourth roller 14 can be adjusted, thereby allowing for fine-tuning of the dimensions. One end of the third support 11 is pivotally connected to one end of the first connecting rod 13 through an elongated hole. The fifth roller 18 is mounted on one end of the third connecting rod 17, which is pivotally connected to one end of the second connecting rod 16. The other end of the second connecting rod 16 is pivotally connected to the fourth support 15, which is constructed of an L-shaped bent steel plate and bolted to the right front side of the notch 5 in the table surface 2. The fourth support 15 is provided with an elongated hole. The other end of the second connecting rod 16 is pivotally connected to the elongated hole of the fourth support 15 with a nut. The third connecting rod 17 is provided with an elongated hole, and one end of the second connecting rod 16 is pivotally connected to the elongated hole of the third connecting rod 17. By adjusting the posture and position of the third connecting rod 17 and the second connecting rod 16, the height and horizontal position of the fifth roller 18 can be adjusted, thereby accommodating the sewing of waistbands of various sizes.

[0030] With the above technical solution, when sewing waistbands using this device, the appropriate rollers are selected according to the size of the waistband. For smaller sizes, the first roller 9 and the fourth roller 14 are used; for medium sizes, the first roller 9, the second roller 10, the third roller 12, and the fourth roller 14 are used; and for larger sizes, the first roller 9, the fourth roller 14, and the fifth roller 18 are used. A negative pressure is created in the waste conveying pipe 20 by a high-pressure air source, thereby conveying the waste falling into the waste collection cylinder 19 to the designated position.

[0031] Adjustment rings 23 are provided on the first roller 9 and the fourth roller 14. By adjusting the position of the adjustment rings 23 on the first roller 9 and the fourth roller 14, the running trajectory of the waistband is made consistent with the guide rail 7.

[0032] A further aspect of this invention is that a waste collection cylinder 19 is provided on the lower side of the cutter 25. The waste collection cylinder 19 is conical and connected to a waste conveying pipe 20. The middle section of the waste conveying pipe 20 is connected to a high-pressure pipe 21, which is connected to a high-pressure air source. The middle section of the high-pressure pipe 21 forms a Venturi effect negative pressure chamber. The high-pressure air source is controlled by a foot switch 22. When the foot switch 22 is pressed, the high-pressure airflow generates negative pressure in the waste conveying pipe 20, drawing the cloth scraps cut by the cutter 25 into the waste collection cylinder 19 and transporting them to the trash can.

[0033] like Figure 3 As shown, during operation, the operator selects the roller combination according to the waistband size: for small sizes, the first roller 99 and the fourth roller 14 form the basic tension; for medium sizes, the second roller 10 and the third roller 12 are added to form a composite tension zone; for large sizes, the fifth roller 18 is used to expand the working surface. The distance between the fourth roller 14 and the first roller 9 is adjusted by moving the first connecting rod 13, and the spatial coordinates of the fifth roller 18 are adjusted by rotating the second connecting rod 16 and the third connecting rod 17. The waste material generated during sewing is sucked into the waste conveying pipe 20 through the waste collection cylinder 19 under negative pressure for centralized processing.

[0034] This implementation method, through the combination of modular roller layout and multi-degree-of-freedom adjustment mechanism, achieves integrated operation of elastic band tension control, fabric flatness maintenance and automated waste cleaning, effectively improving the stability of waistband sewing process.

[0035] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An auxiliary sewing device for elastic waistbands, characterized in that: The machine includes a base (1), a table (2), and a sewing machine head (3). The table (2) is positioned above the base (1), and the sewing machine head (3) is mounted above the table (2). A sewing machine sewing table (4) is provided on one side of the sewing machine head (3), and a sewing machine needle (24) is positioned above the sewing machine sewing table (4). A cutter (25) is provided on one side of the sewing machine needle (24). A notch (5) is provided on the table (2). A first support (6) is provided in front of the sewing machine sewing table (4), and a guide rail (7) is provided above the first support (6). A first roller (9) and a fourth roller (1) are respectively provided behind and in front of the guide rail (7). 4) The bottom of the sewing table (4) of the overlock sewing machine is provided with a second roller (10) and a third roller (12) arranged in parallel. A fifth roller (18) is provided below the third roller (12) and the fourth roller (14). The first roller (9), the second roller (10), the third roller (12), the fourth roller (14) and the fifth roller (18) are all located in the notch (5) of the table (2). A waste collection cylinder (19) is provided on the side below the cutter (25). The waste collection cylinder (19) is connected to the waste conveying pipe (20). The middle section of the waste conveying pipe (20) is connected to the high pressure pipe (21). The high pressure pipe (21) is connected to the high pressure air source.

2. The elastic waistband auxiliary sewing device according to claim 1, characterized in that: The first roller (9) and the second roller (10) are mounted on the second bracket (8), which is installed in the notch (5) of the table (2).

3. The elastic waistband auxiliary sewing device according to claim 2, characterized in that: The third roller (12) is mounted on the third support (11), which is mounted in the notch (5) of the table (2).

4. The elastic waistband auxiliary sewing device according to claim 3, characterized in that: One end of the third support (11) is pivotally connected to one end of the first connecting rod (13), and the fourth roller (14) is installed at the other end of the first connecting rod (13).

5. The elastic waistband auxiliary sewing device according to claim 4, characterized in that: One end of the third bracket (11) is pivotally connected to one end of the first connecting rod (13) through a long hole.

6. The elastic waistband auxiliary sewing device according to claim 1, characterized in that: The fifth roller (18) is installed at one end of the third link (17), the third link (17) is pivotally connected to one end of the second link (16), the other end of the second link (16) is pivotally connected to the fourth bracket (15), and the fourth bracket (15) is installed in the notch (5) of the table (2).

7. The elastic waistband auxiliary sewing device according to claim 6, characterized in that: The fourth support (15) is provided with an elongated hole, and the other end of the second connecting rod (16) is pivotally connected to the elongated hole of the fourth support (15). The third connecting rod (17) is provided with an elongated hole, and one end of the second connecting rod (16) is pivotally connected to the elongated hole of the third connecting rod (17).

8. The elastic waistband auxiliary sewing device according to any one of claims 1-7, characterized in that: The switch of the high-pressure gas source is controlled by a foot switch (22).

9. The elastic waistband auxiliary sewing device according to claim 8, characterized in that: Adjustment rings (23) are provided on the first roller (9) and the fourth roller (14).

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