Waist elastic suture device

Abstract

The utility model relates to the field of clothing production equipment, concretely relates to a waist rubber thread sewing device, including sewing unit and tension unit, tension unit and sewing unit sliding connection, tension unit is equipped with driving wheel group, driven wheel group and by electric cylinder drives its up and down movement tension wheel group and will the waist rubber thread of sewing to be connected on driving wheel group, driven wheel group and tension wheel group, is equipped with elastic compression wheel group in driving wheel group side. The utility model discloses the electric cylinder of tension unit drives tension wheel group up and down movement can be extended to the waist rubber thread according to the set length and can make the waist wrinkle after sewing keep uniformity, the compression wheel group of automatic traction and being equipped with multichannel annular ridge of driving wheel group is compressed to reduce the slippage and transverse deviation when the waist rubber thread moves forward, can improve the uniformity and straightness of sewing stitch further, and can reduce the dependence on manual work, thereby can improve the waist rubber thread sewing efficiency and the beauty of clothing.

Description

Technical Field

[0001] This utility model relates to the field of garment production equipment, specifically to a waist elastic band sewing device. Background Technology

[0002] Some garments, such as sports pants and children's pants, require elastic bands at the waist. During manufacturing, these elastic bands are typically cut to their natural length when compressed, connected into loops, and then sewed into the waistband. Currently, this sewing process mostly relies on manual labor, where the elastic bands are pulled and stretched forward by hand while a sewing machine sews them together. After sewing, the elastic bands are released, and their elasticity causes them to contract and form pleats. However, because it's difficult to control the length and angle of the elastic band pulls consistently, the uniformity and straightness of the stitches and pleats at the waist are not guaranteed, affecting the garment's appearance. Furthermore, manual pulling also reduces efficiency. Therefore, there is a need for an elastic band sewing device that can automatically pull and stretch the elastic bands, reducing reliance on manual labor and improving sewing efficiency and garment aesthetics. This invention addresses this need. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model discloses a waist elastic band sewing device, including a sewing unit and a tensioning unit. The tensioning unit is slidably connected to the sewing unit. The tensioning unit is provided with a driving wheel group, a driven wheel group, a tensioning wheel group, a drive component, an electric cylinder, and a pressure wheel group. The drive component can drive the driving wheel group to rotate. The driving wheel group and the driven wheel group are placed on both sides of the sewing machine body of the sewing unit. The tensioning wheel group is placed below the driving wheel group and the driven wheel group and is driven to move up and down by the electric cylinder. The annular waist elastic band covered by the waist piece can be sleeved on the driving wheel group, the driven wheel group, and the tensioning wheel group. The pressure wheel group with multiple annular ridges on its surface is placed on one side of the driving wheel group. The waist elastic band is placed between the pressure wheel group and the driving wheel group and can be pulled forward by the driving wheel group. It can be elastically pressed against the driving wheel group by the pressure wheel group. This utility model's waist elastic band sewing device utilizes an electric cylinder to drive the tensioning wheel assembly to move up and down, extending and stretching the waist elastic band to a set length, thereby ensuring uniform waist folds after sewing. The device employs an active wheel assembly for automatic traction and a pressing wheel assembly with multiple annular convex ridges for tightening, reducing slippage and lateral deviation of the waist elastic band during forward movement. This improves the uniformity and straightness of the stitches and reduces reliance on manual labor, thus enhancing the efficiency of waist elastic band sewing and the aesthetics of the garment.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A waist elastic band sewing device includes a sewing unit, which has a sewing machine body and a frame. The frame has a panel and a base plate located below the panel. The sewing machine body is connected to the panel of the frame. The device further includes a tensioning unit, which is located at the end of the sewing machine body of the sewing unit adjacent to the needle and slidably connected between the panel and the base plate of the frame. The tensioning unit has a drive wheel assembly, a driven wheel assembly, a tensioning wheel assembly, a drive member, and a pressure wheel assembly. Each of the drive wheel assembly, driven wheel assembly, tensioning wheel assembly, and pressure wheel assembly has a circular wheel. The drive member is connected to the drive wheel assembly by a transmission component and can drive the drive wheel assembly to rotate. The driven roller assembly is located on the front and rear sides of the sewing machine body. The tension roller assembly is located below the drive roller assembly and the driven roller assembly. The ring-shaped waist elastic band covered by the waist piece can be sleeved on the drive roller assembly, the driven roller assembly, and the tension roller assembly in a triangular shape. The tension roller assembly can slide up and down, and when it slides down, it can extend and stretch the waist elastic band to stretch it to a set length before sewing it with the waist piece. The pressure roller assembly is located on one side of the drive roller assembly. The waist elastic band covered by the waist piece, which is sleeved on the drive roller assembly, is located between the pressure roller assembly and the drive roller assembly. It can be elastically pressed against the drive roller assembly by the pressure roller assembly to increase its friction and can be pulled forward by the drive roller assembly.

[0006] The tensioning unit also includes a vertical plate, a linear module, and linear guides. The vertical plate is in the shape of an inverted trapezoid, with two upward-protruding edges at the two corners of its top surface. There are two linear guides, which are fixed to the upper surface of the bottom plate of the frame. The linear module is fixed to the back of the panel of the frame and is parallel to the two linear guides. The vertical plate is upright and perpendicular to both the linear module and the linear guides. The slider of the linear module is connected to the top surface of the vertical plate, and the slider of the two linear guides is connected to the bottom surface of the vertical plate. The protruding edges at the two corners of the vertical plate can be movably inserted into the notches at the two corners of the panel of the frame for avoidance. A first sliding groove is vertically provided in the middle of the lower part of the vertical plate.

[0007] Both the driving wheel assembly and the driven wheel assembly include rollers and shafts. The rollers are circular, and the shafts are stepped circular shafts. The rollers are fixed to the shafts, and one end of the shaft extends to the outside of one end of the roller. The outer extensions of the shafts of the driving wheel assembly and the driven wheel assembly are rotatably connected to the two upper corners of the upright plate by bearing seats. The driving wheel assembly and the driven wheel assembly are respectively placed in the notches provided at the two corners of one end of the panel for avoidance. The upper surfaces of the rollers of the driving wheel assembly and the driven wheel assembly are flush with the upper surface of the panel.

[0008] The driving pulley assembly further includes a first pulley connected to the outer extension of the shaft of the driving pulley assembly. The first pulley is preferably connected to the shaft by a shrink sleeve. The driven pulley assembly further includes a first retaining ring, which is movably sleeved on the outer wall of the roller of the driven pulley assembly and its movement can be restricted by a set screw.

[0009] The tensioning wheel assembly includes a rotating wheel, a sliding shaft, a first connecting sleeve, a sensing rod, and a second retaining ring. The rotating wheel is a circular wheel, and the sliding shaft is a stepped circular shaft. The rotating wheel is rotatably connected to the sliding shaft by a bearing seat. One end of the sliding shaft extends to the outside of one end of the rotating wheel. The outer extension of the sliding shaft has a sliding section with a waist-shaped cross-section. The sliding section is formed by symmetrically cutting two parallel sliding surfaces from the circular outer wall of the outer extension. A shoulder is provided on the sliding section near the end of the rotating wheel. The sliding section of the sliding shaft can be inserted into the first sliding groove of the vertical plate and can slide up and down in the first sliding groove. The first connecting sleeve is fixed to the sliding section of the sliding shaft. The first connecting sleeve and the shoulder on the sliding section of the sliding shaft are respectively placed on both sides of the vertical plate and fit against the vertical plate to limit the sliding shaft from deflecting in different directions when it slides up and down. The sensing rod is a round rod and is fixed to the outer end of the outer extension of the sliding shaft. The second retaining ring is movably sleeved on the outer wall of the rotating wheel and its movement can be restricted by a set screw.

[0010] The driving component includes a short shaft, a second pulley, and a motor. The short shaft is rotatably connected to the middle of the upright plate by a bearing housing. One end of the short shaft is connected to the second pulley, which is preferably connected to the short shaft by a shrink sleeve. The second pulley and the first pulley can be connected by a transmission belt to form a transmission pair. Preferably, the first pulley and the second pulley are synchronous pulleys, and the matching transmission belt is a synchronous belt. The other end of the short shaft is connected to the output shaft of the motor. The motor is a speed-regulating motor or a servo motor, and the motor is fixed to the back of the upright plate.

[0011] The pressure roller assembly includes a pressure roller, a mandrel, a second connecting sleeve, a sliding rod, a spring, and a connecting seat. The connecting seat is a transverse T-shaped seat containing a web and an end plate. A second sliding groove is transversely provided on its web, and two sliding sleeves are symmetrically provided on its end plate, positioned on opposite sides of the web. One end of the web of the connecting seat is connected to one side of an upper corner of the vertical plate and adjacent to the drive roller assembly. The pressure roller is a circular roller-shaped wheel body. Several annular ridges are evenly distributed on the outer surface of the pressure roller to prevent lateral deviation of the waist elastic band. The mandrel is a stepped circular shaft. The pressure roller is rotatably connected to the mandrel by a bearing seat. One end of the mandrel extends to the outside of one end of the pressure roller. The outer extension of the mandrel has a sliding section with a drum-shaped cross-section. The mandrel's circular outer wall is symmetrically cut out to form two parallel sliding surfaces. The sliding section of the mandrel can be inserted into the second sliding groove of the connecting seat and can slide laterally in the second sliding groove. The second connecting sleeve, the sliding rod, and the spring are all in pairs. The two second connecting sleeves are fixed to the sliding section of the mandrel and are placed on both sides of the web of the connecting seat and fit against the web to limit the mandrel's sway in different directions when it slides laterally. One end of the two sliding rods is connected to the two second connecting sleeves respectively, and the other end of each is inserted into the two sliding sleeves on the end plate of the connecting seat and can slide in their respective sliding sleeves. The two springs are respectively sleeved on the two sliding rods. The springs are placed between the end plate of the connecting seat and the second connecting sleeves and elastically press against the second connecting sleeves.

[0012] Preferably, the rollers, rotary wheels, and pressure rollers are provided with an anti-slip rubber layer on their respective surfaces.

[0013] The sewing unit is also equipped with an electric cylinder, which is vertically hinged to the back of the upright plate. Its cylinder rod is connected to the first connecting sleeve, and the electric cylinder can drive the tensioning wheel assembly to move up and down.

[0014] The sewing unit is also equipped with a detection component, which includes a mounting plate and a detection switch. The mounting plate is placed on one side of the sensing rod of the tensioning wheel assembly and is vertically connected to the base plate of the frame. The mounting plate is provided with a vertical adjustment groove. The detection switch includes two photoelectric switches, which are respectively connected to the upper and lower parts of the adjustment groove of the mounting plate for detecting whether the sensing rod is in the upper limit position or the lower limit position when the tensioning wheel assembly slides up and down.

[0015] The waist elastic band sewing device also includes an electrical control unit, which comprises a control motherboard, a control module, and a control switch. The electrical control unit is electrically connected to the motor, electric cylinder, linear module, and detection switch. The electrical control unit is also electrically connected to the electrical control system of the sewing machine body or directly embedded in the electrical control system of the sewing machine body for centralized control.

[0016] As described above, the advantages of the waist elastic band sewing device provided by this utility model are as follows: the tensioning unit is slidably connected to the frame of the sewing unit. The tensioning unit is equipped with a drive wheel group, a driven wheel group, and a tensioning wheel group that is driven up and down by an electric cylinder. A pressing wheel group that can be elastically pressed against the drive wheel group is provided on one side. The annular waist elastic band covered by the waist garment piece can be sleeved on the drive wheel group, the driven wheel group, and the tensioning wheel group and elastically pressed by the pressing wheel group. The up and down movement of the tensioning wheel group driven by the electric cylinder can extend and stretch the waist elastic band to a set length, thereby keeping the waist folds uniform after sewing. The automatic traction of the drive wheel group and the pressing wheel group with multiple annular convex ridges can reduce slippage and lateral deviation of the waist elastic band when it moves forward, thereby improving the uniformity and straightness of the sewing stitches and reducing the dependence on manual labor, thus improving the sewing efficiency of the waist elastic band and the aesthetics of the garment. This utility model has a reasonable design, simple structure, low cost, and is easy to promote. Attached Figure Description

[0017] Figure 1 This is a general schematic diagram of the waist elastic band sewing device described in this utility model;

[0018] Figure 2 This is a schematic diagram of the sewing unit;

[0019] Figure 3 This is an enlarged schematic diagram of the tensioning unit;

[0020] Figure 4 for Figure 3 Enlarged diagram of direction A in the diagram;

[0021] Figure 5 for Figure 4 A magnified diagram of BB in the image;

[0022] Figure 6 This is an enlarged schematic diagram of the drive wheel assembly;

[0023] Figure 7 This is an enlarged schematic diagram of the driven gear set;

[0024] Figure 8 for Figure 7 Enlarged schematic diagram of part C in the diagram;

[0025] Figure 9 This is an enlarged schematic diagram of the tensioner assembly;

[0026] Figure 10 for Figure 9 A magnified diagram of DD in the image;

[0027] Figure 11 This is an enlarged schematic diagram of the driving component;

[0028] Figure 12 This is an enlarged schematic diagram of the pressure wheel assembly;

[0029] Figure 13 for Figure 12 Enlarged diagram of EE in the image;

[0030] Figure 14 This is an enlarged schematic diagram of the component being tested.

[0031] Figure label:

[0032] 1 Sewing unit; 11 Sewing machine body; 12 Frame; 121 Panel; 122 Base plate; 2 Tensioning unit; 20 Vertical plate; 201 First slide groove; 21 Drive wheel assembly; 211 Roller; 212 Rotary shaft; 213 First pulley; 22 Driven wheel assembly; 221 First retaining ring; 23 Tensioning wheel assembly; 231 Rotary wheel; 232 Sliding shaft; 233 First connecting sleeve; 234 Sensing rod; 235 Second retaining ring; 24 Drive component; 241 Short shaft; 242 Second pulley; 243 Motor; 25 Electric cylinder; 26 Pressure wheel assembly; 261 Pressure roller; 262 Mandrel; 263 Second connecting sleeve; 264 Slide rod; 265 Spring; 266 Connecting seat; 2661 Second slide groove; 27 Linear module; 28 Linear guide rail; 29 Detection component; 291 Mounting plate; 2911 Adjustment groove; 292 Detection switch. Detailed Implementation

[0033] The present invention will be further described below through specific embodiments.

[0034] like Figure 1 and Figure 2 As shown, the present invention provides a waist elastic band sewing device, including a sewing unit 1 and a tensioning unit 2. The sewing unit 1 is provided with a sewing machine body 11 and a frame 12. The frame 12 is provided with a panel 121 and a base plate 122 located below the panel 121. The sewing machine body 11 is connected to the panel 121 of the frame 12. The tensioning unit 2 is located at the end of the sewing machine body 11 of the sewing unit 1 adjacent to the needle and is slidably connected between the panel 121 and the base plate 122 of the frame 12.

[0035] like Figures 1 to 5As shown, the tensioning unit 2 of this utility model includes a vertical plate 20, a drive wheel assembly 21, a driven wheel assembly 22, a tensioning wheel assembly 23, a drive component 24, an electric cylinder 25, a pressing wheel assembly 26, a linear module 27, a linear guide rail 28, and a detection component 29. The drive wheel assembly 21, the driven wheel assembly 22, the tensioning wheel assembly 23, the drive component 24, the electric cylinder 25, and the pressing wheel assembly 26 are all connected to the vertical plate 20. The vertical plate 20 is slidably connected to the frame 12 of the sewing unit 1 through the linear module 27 and the linear guide rail 28. The detection component 29 is connected to the frame 12. The driving component 24 can drive the drive wheel assembly 21 to rotate. The drive wheel assembly 21 and the driven wheel assembly 22 are respectively placed on the front and rear sides of the sewing machine body 11. The tension wheel assembly 23 is placed below the drive wheel assembly 21 and the driven wheel assembly 22. The ring-shaped waist elastic band covered by the waist piece can be sleeved on the drive wheel assembly 21, the driven wheel assembly 22 and the tension wheel assembly 23 in a triangular state. The tension wheel assembly 23 can slide up and down, and when it slides down, it can extend and stretch the waist elastic band to stretch the waist elastic band to a set length before sewing it with the waist piece. The pressure wheel assembly 26 is placed on one side of the drive wheel assembly 21. The waist elastic band covered by the waist piece and sleeved on the drive wheel assembly 21 is placed between the pressure wheel assembly 26 and the drive wheel assembly 21. It can be elastically pressed against the drive wheel assembly 21 by the pressure wheel assembly 26 to enhance its friction and can be pulled forward by the drive wheel assembly 21.

[0036] like Figures 1 to 5 As shown, the upright plate 20 of this utility model is in the shape of an inverted trapezoid, with two upward-protruding edges at the two corners of its top surface. Two linear guide rails 28 are fixed to the upper surface of the base plate 122 of the frame 12. The linear module 27 is fixed to the back of the panel 121 of the frame 12 and is parallel to both linear guide rails 28. The linear module 27 is a known technology; in this embodiment, the linear module 27 used is a ball screw type linear module. The upright plate 20 is vertical and perpendicular to both the linear module 27 and the linear guide rails 28. The slider of the linear module 27 is connected to the top surface of the upright plate 20, and the sliders of the two linear guide rails 28 are connected to the bottom surface of the upright plate 20. The protruding edges at the two corners of the upright plate 20 can be movably inserted into the notches provided at the two corners of one end of the panel 121 of the frame 12 for avoidance. A first sliding groove 201 is vertically provided in the middle of the lower part of the upright plate 20.

[0037] like Figures 1 to 8As shown, the driving wheel assembly 21 of this utility model includes a roller 211, a rotating shaft 212, and a first pulley 213. The roller 211 is a circular wheel, and the rotating shaft 212 is a stepped circular shaft. The roller 211 is fixed to the rotating shaft 212, and one end of the rotating shaft 212 extends to the outside of one end of the roller 211. The first pulley 213 is connected to the outer extension of the rotating shaft 212 of the driving wheel assembly 21. In this embodiment, the first pulley 213 is connected to the rotating shaft 212 by an expansion sleeve. The driven wheel assembly 22 includes a roller 211, a rotating shaft 212, and a first retaining ring 221. The first retaining ring 221 is movably sleeved on the outer wall of the roller 211 of the driven wheel assembly 22 and its movement can be restricted by a set screw. The outer extensions of the shafts 212 of the driving wheel set 21 and the driven wheel set 22 are rotatably connected to the two upper corners of the upright plate 20 by bearing seats. The driving wheel set 21 and the driven wheel set 22 are respectively placed in the corner notches provided at one end of the panel 121 for avoidance. The upper surface of the rollers 211 of the driving wheel set 21 and the driven wheel set 22 is flush with the upper surface of the panel 121.

[0038] like Figures 1 to 5 , Figure 9 and Figure 10 As shown, the tensioning wheel assembly 23 of this utility model includes a rotating wheel 231, a sliding shaft 232, a first connecting sleeve 233, a sensing rod 234, and a second retaining ring 235. The rotating wheel 231 is a circular wheel, and the sliding shaft 232 is a stepped circular shaft. The rotating wheel 231 is rotatably connected to the sliding shaft 232 by a bearing seat. One end of the sliding shaft 232 extends to the outside of one end of the rotating wheel 231. The outer extension of the sliding shaft 232 is provided with a sliding section with a cross-section in the shape of a waist drum. The sliding section is formed by symmetrically cutting two parallel sliding surfaces from the circular outer wall of the outer extension. A shoulder is provided on the sliding section near the end of the rotating wheel 231. The sliding section of the sliding shaft 232 can be inserted into the first groove 201 of the upright plate 20 and can slide up and down in the first groove 201. The first connecting sleeve 233 is fixedly connected to the sliding section of the sliding shaft 232. The first connecting sleeve 233 and the shoulder on the sliding section of the sliding shaft 232 are respectively placed on both sides of the upright plate 20 and fit against the upright plate 20 to limit the sliding shaft 232 from deflecting in different directions when it slides up and down. The sensing rod 234 is a round rod and is fixedly connected to the outer end of the outer extension of the sliding shaft 232. The second retaining ring 235 is movably sleeved on the outer wall of the rotating wheel 231 and its movement can be restricted by the set screw.

[0039] like Figures 1 to 5 , Figure 11As shown, the driving component 24 of this utility model includes a short shaft 241, a second pulley 242, and a motor 243. The short shaft 241 is rotatably connected to the middle of the upright plate 20 by a bearing seat. One end of the short shaft 241 is connected to the second pulley 242. In this embodiment, the second pulley 242 is connected to the short shaft 241 by a shrink sleeve. The second pulley 242 and the first pulley 213 can be connected by a transmission belt to form a transmission pair. In this embodiment, the first pulley 213 and the second pulley 242 are synchronous pulleys, and the matched transmission belt is a synchronous belt. The other end of the short shaft 241 is connected to the output shaft of the motor 243. The motor 243 is a speed-regulating motor or a servo motor. In this embodiment, the motor 243 is a speed-regulating motor, and the motor 243 is fixed to the back of the upright plate 20.

[0040] like Figures 1 to 13 As shown, the pressure wheel assembly 26 of this utility model includes a pressure wheel 261, a spindle 262, a second connecting sleeve 263, a sliding rod 264, a spring 265, and a connecting seat 266. The connecting seat 266 is a transverse T-shaped seat including a web and an end plate. A second sliding groove 2661 is provided transversely on its web, and two sliding sleeves are symmetrically provided on its end plate, with the two sliding sleeves placed on both sides of the web. One end of the web of the connecting seat 266 is connected to an upper corner of the vertical plate 20. The pressure roller 261 is a circular roller-shaped wheel body located on one side and adjacent to the drive wheel assembly 21. Several annular protrusions are evenly distributed on the outer surface of the pressure roller 261 to prevent the waist elastic band from shifting laterally. The spindle 262 is a stepped circular shaft. The pressure roller 261 is rotatably connected to the spindle 262 by a bearing seat. One end of the spindle 262 extends to the outside of one end of the pressure roller 261. A sliding section with a waist-drum shaped cross-section is provided on the outer extension of the spindle 262. The sliding section is formed by the outer... The extended section is formed by symmetrically cutting out two parallel sliding surfaces on its circular outer wall. The sliding section of the spindle 262 can be inserted into the second sliding groove 2661 of the connecting seat 266 and can slide laterally in the second sliding groove 2661. The second connecting sleeve 263, the sliding rod 264, and the spring 265 are all in pairs. The two second connecting sleeves 263 are fixed to the sliding section of the spindle 262 and are placed on both sides of the web of the connecting seat 266 and fit against the web to limit the spindle 262 from swaying in different directions when it slides laterally. One end of the two sliding rods 264 are respectively connected to the two second connecting sleeves 263, and the other end of each is inserted into the two sliding sleeves on the end plate of the connecting seat 266 and can slide in their respective sliding sleeves. The two springs 265 are respectively sleeved on the two sliding rods 264. The springs 265 are placed between the end plate of the connecting seat 266 and the second connecting sleeves 263 and elastically press against the second connecting sleeves 263. In this embodiment, the rollers 211, 231, and 261 are provided with anti-slip rubber layers on their respective surfaces.

[0041] like Figures 1 to 5As shown, the electric cylinder 25 of this utility model is vertically hinged to the back of the upright plate 20, and its cylinder rod is connected to the first connecting sleeve 233. The electric cylinder 25 can drive the tensioning wheel assembly 23 to move up and down.

[0042] like Figures 1 to 5 , Figure 14 As shown, the detection component 29 of this utility model includes a mounting plate 291 and a detection switch 292. The mounting plate 291 is placed on one side of the sensing rod 234 of the tensioning wheel assembly 23 and is vertically connected to the base plate 122 of the frame 12. The mounting plate 291 is provided with a vertical adjustment groove 2911. The detection switch 292 includes two photoelectric switches. The two photoelectric switches are respectively connected to the upper and lower parts of the adjustment groove 2911 of the mounting plate 291 for detecting whether the sensing rod 234 is in the upper limit state and the lower limit state when the tensioning wheel assembly 23 slides up and down.

[0043] like Figures 1 to 14As shown in the figure, the waist elastic band sewing device of this utility model is also provided with an electrical control unit, which is not shown in the figure. The electrical control unit includes a control motherboard, a control module and a control switch. The electrical control unit is electrically connected to the motor 243, the electric cylinder 25, the linear module 27 and the detection switch 292. The electrical control unit is also electrically connected to the electrical control system of the sewing machine body 11 or directly embedded into the electrical control system of the sewing machine body 11 for centralized control. Before operation, the electric control unit commands the electric cylinder 25 to move the tensioning wheel assembly 23 upwards to a pre-set upper limit position. Then, the positions of the first retaining ring 221 and the second retaining ring 235 are adjusted to align them for lateral positioning when fitting the waist elastic band for sewing. The pressure wheel assembly 26 is then manually pulled open, and the annular waist elastic band, covered by the waist garment piece, is fitted onto the driving wheel assembly 21, the driven wheel assembly 22, and the tensioning wheel assembly 23. The pressure wheel assembly 26 then elastically presses the band in place. The multiple annular ridges on the pressure wheel assembly 26 guide the linear movement of the waist elastic band. To reduce lateral deviation; then, the electric cylinder 25 is instructed to move, driving the tensioning wheel assembly 23 downward to a pre-set lower limit position. This lower limit position can be set by adjusting the installation position of the detection switch 292 of the detection component 29 according to the actual required length of the waist elastic band. When the tensioning wheel assembly 23 slides downward, the waist elastic band can be stretched to the set length. Then, the sewing machine body 11 and the motor 243 of the drive component 24 are instructed to start, and the roller 211 of the drive wheel assembly 21 rotates to pull the stretched annular waist elastic band covered by the waist piece forward and sewed by the sewing machine body 11. If multiple stitches are required for sewing, the linear module 27 can be started after the first stitch is completed and the motors 243 of the sewing machine body 11 and the drive component 24 have stopped. The linear module 27 drives the upright plate 20 to move horizontally, so that the needle of the sewing machine body 11 is aligned with the position of the next stitch. Then, the motors 243 of the sewing machine body 11 and the drive component 24 can be started again to continue to complete the next stitch.

[0044] The waist elastic band sewing device of this utility model has a tensioning unit 2 slidably connected to the frame 12 of the sewing unit 1. The tensioning unit 2 is provided with a driving wheel assembly 21, a driven wheel assembly 22, and a tensioning wheel assembly 23 driven up and down by an electric cylinder 25. A pressing wheel assembly 26 is provided on one side of the driving wheel assembly 21, which can be elastically pressed against it. The annular waist elastic band covered by the waist piece can be sleeved on the driving wheel assembly 21, the driven wheel assembly 22, and the tensioning wheel assembly 23, and is elastically pressed by the pressing wheel assembly 26. The tensioning mechanism utilizes an electric cylinder 25 to drive the tensioning wheel assembly 23 to move up and down, which can extend and stretch the waist elastic band to a set length, thereby ensuring that the waist pleats remain uniform after sewing. The automatic traction of the drive wheel assembly 21 and the pressing wheel assembly 26 with multiple annular convex ridges are used to press the elastic band, reducing slippage and lateral deviation when the waist elastic band moves forward. This improves the uniformity and straightness of the sewing stitches and reduces reliance on manual labor, thereby improving the efficiency of waist elastic band sewing and the aesthetics of the garment.

[0045] The above is only one specific embodiment of the present utility model, but the design concept of the present utility model is not limited thereto. Any non-substantial modifications made to the present utility model using this concept shall be deemed as an infringement of the protection scope of the present utility model.

Claims

1. A waist elastic band sewing device, comprising a sewing unit (1), the sewing unit (1) having a sewing machine body (11) and a frame (12), the frame (12) having a panel (121) and a base plate (122) disposed below the panel (121), the sewing machine body (11) being connected to the panel (121) of the frame (12), characterized in that: It also includes a tensioning unit (2), which is placed at one end of the sewing machine body (11) of the sewing unit (1) and slidably connected between the panel (121) and the base plate (122) of the frame (12). The tensioning unit (2) is provided with a drive wheel assembly (21), a driven wheel assembly (22), a tensioning wheel assembly (23), a drive member (24), and a pressure wheel assembly (26). The drive wheel assembly (21), the driven wheel assembly (22), the tensioning wheel assembly (23), and the pressure wheel assembly (26) are all provided with circular wheels. The drive member (24) can drive the drive wheel assembly (21) to rotate. The drive wheel assembly (21) and the driven wheel assembly (22) are respectively placed on the sewing machine. On both sides of the main body (11), the tensioning wheel assembly (23) is placed below the driving wheel assembly (21) and the driven wheel assembly (22). The ring-shaped waist elastic band covered by the waist piece can be sleeved on the driving wheel assembly (21), the driven wheel assembly (22) and the tensioning wheel assembly (23). The tensioning wheel assembly (23) can slide up and down, and when it slides down, it can extend and stretch the waist elastic band. The pressure wheel assembly (26) is placed on one side of the driving wheel assembly (21). The waist elastic band covered by the waist piece is placed between the pressure wheel assembly (26) and the driving wheel assembly (21). It can be elastically pressed against the driving wheel assembly (21) by the pressure wheel assembly (26) and can be pulled forward by the driving wheel assembly (21).

2. The waist elastic band sewing device according to claim 1, characterized in that: The tensioning unit (2) is also provided with a vertical plate (20), a linear module (27) and a linear guide rail (28). The linear guide rail (28) consists of two pieces, which are fixed to the upper surface of the bottom plate (122) of the frame (12). The linear module (27) is fixed to the back of the panel (121) of the frame (12) and is parallel to the two linear guide rails (28). The vertical plate (20) is upright and perpendicular to the linear module (27) and the linear guide rail (28). The slider of the linear module (27) is connected to the top surface of the vertical plate (20), and the sliders of the two linear guide rails (28) are connected to the bottom surface of the vertical plate (20). The vertical plate (20) has a first sliding groove (201) vertically in the middle.

3. The waist elastic band sewing device according to claim 2, characterized in that: Both the driving wheel assembly (21) and the driven wheel assembly (22) include a roller (211) and a rotating shaft (212). The roller (211) is fixed to the rotating shaft (212). One end of the rotating shaft (212) extends to the outside of the roller (211). The outer extensions of the rotating shaft (212) of the driving wheel assembly (21) and the driven wheel assembly (22) are rotatably connected to the two upper corners of the upright plate (20).

4. The waist elastic band sewing device according to claim 3, characterized in that: The driving wheel assembly (21) further includes a first pulley (213), which is connected to the outer extension of the shaft (212) of the driving wheel assembly (21). The driven wheel assembly (22) further includes a first retaining ring (221), which is movably sleeved on the outer wall of the roller (211) of the driven wheel assembly (22) and can restrict its movement.

5. The waist elastic band sewing device according to claim 4, characterized in that: The tensioning wheel assembly (23) includes a rotating wheel (231), a sliding shaft (232), a first connecting sleeve (233), a sensing rod (234), and a second retaining ring (235). The rotating wheel (231) is rotatably connected to the sliding shaft (232). One end of the sliding shaft (232) extends to the outside of the rotating wheel (231). A sliding section is provided on the outer extension of the sliding shaft (232). The sliding section of the sliding shaft (232) can be inserted into the first sliding groove (201) of the upright plate (20) and can slide up and down in the first sliding groove (201). The first connecting sleeve (233) is fixedly connected to the sliding section of the sliding shaft (232). The sensing rod (234) is fixedly connected to the outer end of the outer extension of the sliding shaft (232). The second retaining ring (235) is movably sleeved on the outer wall of the rotating wheel (231) and can restrict its movement.

6. The waist elastic band sewing device according to claim 5, characterized in that: The drive component (24) includes a short shaft (241), a second pulley (242), and a motor (243). The short shaft (241) is rotatably connected to the middle of the upright plate (20). One end of the short shaft (241) is connected to the second pulley (242). The second pulley (242) and the first pulley (213) can be connected by a transmission belt. The other end of the short shaft (241) is connected to the output shaft of the motor (243).

7. The waist elastic band sewing device according to claim 6, characterized in that: The pressure wheel assembly (26) includes a pressure wheel (261), a spindle (262), a second connecting sleeve (263), a slide rod (264), a spring (265), and a connecting seat (266). The connecting seat (266) is a T-shaped seat containing a web and an end plate. A second sliding groove (2661) is provided on its web, and two sliding sleeves are symmetrically provided on its end plate. One end of the web of the connecting seat (266) is connected to one side of an upper corner of the upright plate (20) and is adjacent to the drive wheel assembly (21). Several annular protrusions are evenly distributed on the outer surface of the pressure wheel (261). The pressure wheel (261) is rotatably connected to the spindle (262). One end of the spindle (262) extends to the outside of the pressure wheel (261). A sliding section is provided on the outer extension of the spindle (262). The sliding section of the spindle (262) can be inserted into the spindle. The second connecting sleeve (263), the slide rod (264), and the spring (265) are all in pairs. The two second connecting sleeves (263) are fixed on the sliding section of the spindle (262) and are respectively placed on both sides of the web of the connecting seat (266). One end of the two slide rods (264) is connected to the two second connecting sleeves (263) respectively, and the other end of each is inserted into the two slide sleeves on the end plate of the connecting seat (266) and can slide in their respective corresponding slide sleeves. The two springs (265) are respectively sleeved on the two slide rods (264). The springs (265) are placed between the end plate of the connecting seat (266) and the second connecting sleeve (263) and elastically press against the second connecting sleeve (263).

8. The waist elastic band sewing device according to claim 7, characterized in that: The sewing unit (1) is also provided with an electric cylinder (25), which is vertically hinged to the back of the upright plate (20), and its cylinder rod is connected to the first connecting sleeve (233).

9. The waist elastic band sewing device according to claim 8, characterized in that: The sewing unit (1) is also provided with a detection component (29), which includes a mounting plate (291) and a detection switch (292). The mounting plate (291) is placed on one side of the sensing rod (234) of the tensioning wheel assembly (23) and is vertically connected to the bottom plate (122) of the frame (12). The mounting plate (291) is provided with a vertical adjustment groove (2911). The detection switch (292) includes two photoelectric switches, which are respectively connected to the upper and lower parts of the adjustment groove (2911) of the mounting plate (291).

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