A pant front fly sewing template

Abstract

The application provides a trousers front fly sewing template, comprising a bottom plate, a sewing groove is formed in the bottom plate, a positioning structure for fixing a trousers piece is hinged to the side of the sewing groove on the bottom plate, the positioning structure comprises a first positioning plate, a second positioning plate, a third positioning plate and a fourth positioning plate, through the cooperation of multiple positioning plates and the precise groove position design, the precise automation, high-precision positioning and sewing of a zipper, a left trousers piece, a right trousers piece and lining cloth (pad cloth, attached cloth) in the trousers front fly sewing process are realized, through the use of the template, all processes of the trousers front fly process can be completed at one time, the operation is simpler and more efficient; in addition, a sliding structure is further arranged between the bottom plate and the third positioning plate, the third positioning plate can slide relative to the bottom plate, so that the position of the trousers front crotch is adjusted, the template can adapt to the front fly sewing requirements of different size specifications, the application range of the template is improved, and the production cost is reduced.

Description

Technical Field

[0001] This invention belongs to the field of garment production technology, specifically relating to a trouser front placket sewing template. Background Technology

[0002] The sewing of the front fly of trousers is one of the key steps in trouser manufacturing, and its quality directly affects the appearance, comfort, and overall quality of the trousers. Traditionally, front fly sewing relies primarily on manual labor, where workers rely on experience to manually align the zipper with the left and right trouser panels before sewing. However, this manual method has several problems: firstly, the accuracy of manual positioning is difficult to guarantee, easily leading to defects such as misaligned zippers, asymmetrical trouser panels, and uneven stitching, resulting in a low product qualification rate and a high rework rate; secondly, manual operation requires a high level of skill from workers, and the sewing process is tedious and time-consuming, making it difficult to improve production efficiency and meet the needs of large-scale, mass production.

[0003] Furthermore, existing template structures are typically fixed and cannot adapt to the production needs of pants of different sizes and specifications, resulting in poor practicality. If the sewing size needs to be adjusted, the entire template must be replaced, which not only increases production costs but also seriously affects production efficiency and is extremely inconvenient to use. Moreover, the lack of a structure for sewing lining means that the sewing of the lining needs to be done separately. This not only increases the number of steps and extends the production time but may also cause errors due to secondary positioning, affecting the overall sewing quality of the front placket and failing to meet users' demands for a high-quality wearing experience. Summary of the Invention

[0004] (1) Technical problems to be solved This invention provides a trouser front placket sewing template, which aims to solve the problems of existing trouser front placket sewing templates being fixed, unable to freely adjust the sewing size as needed, and lacking the function of sewing lining, resulting in poor positioning accuracy, unstable sewing quality, low production efficiency, and inability to adapt to the mass production needs of trousers of different specifications.

[0005] (2) Technical solution The present invention provides a trouser front placket sewing template, including a base plate, wherein a sewing groove is provided on the base plate, and a support strip for placing a zipper is provided in the sewing groove. The support strip divides the sewing groove into a first groove, a second groove and a first arc-shaped groove that are interconnected. The base plate is hinged to the side of the sewing groove with a positioning structure for fixing the trouser piece. The positioning structure includes a first positioning plate, a second positioning plate, a third positioning plate and a fourth positioning plate. The first positioning plate and the second positioning plate are both located on the same side of the sewing groove and are used to fix the right side of the zipper and the right trouser piece, respectively. The third positioning plate is opposite to the first positioning plate and located on the other side of the sewing groove. The third positioning plate is provided with a second arc-shaped groove. During sewing, the second arc-shaped groove corresponds to the first arc-shaped groove. The fourth positioning plate is located on one side of the top of the zipper. The fourth positioning plate has a fourth groove and a fifth groove. The fourth groove corresponds to the first groove, and the fifth groove corresponds to the second groove. A sliding structure is provided between the base plate and the third positioning plate, allowing the third positioning plate to slide relative to the base plate to adjust the distance L between the second arc-shaped groove and the zipper. Furthermore, the sliding structure includes a first tooth and a second tooth that mesh with each other. The first tooth is disposed on the base plate, and the second tooth is disposed on the third positioning plate. The second tooth is capable of slidingly meshing with the first tooth.

[0006] Furthermore, the second arc-shaped groove includes a straight section, a first arc-shaped section, and a second arc-shaped section that are interconnected, with the first arc-shaped section and the second arc-shaped section located sequentially at the ends of the straight section; When the third positioning plate moves horizontally away from the zipper and the first arc segment or the second arc segment is in corresponding contact with the side of the first arc groove away from the zipper, the distance L is at its maximum. When the third positioning plate moves toward the direction of the zipper and the first arc segment or the second arc segment is in contact with the side of the first arc groove closest to the zipper, the spacing L is minimized.

[0007] Furthermore, the base plate is also provided with an auxiliary plate and a fixing plate. The fixing plate is fixedly connected to the base plate and the first tooth is disposed on the fixing plate. The third positioning plate is hinged to the auxiliary plate and the second tooth is disposed on the auxiliary plate. The third positioning plate is moved relative to the base plate by driving the auxiliary plate to move relative to the fixing plate.

[0008] Furthermore, the fourth positioning plate includes two independent positioning pieces, a first positioning piece and a second positioning piece, with a gap between the first positioning piece and the second positioning piece, the gap corresponding to the first groove and forming the fourth groove; the fifth groove is disposed on the second positioning piece.

[0009] Furthermore, the end of the second positioning piece away from the base plate has a third arc-shaped segment extending toward the first positioning piece, and the third arc-shaped segment is connected to the fifth groove.

[0010] Furthermore, the support strip is also provided with a limiting strip, which is in the shape of a "U" and surrounds the support strip to form a limiting groove that is compatible with the zipper, thereby guiding and positioning the zipper.

[0011] Furthermore, it also includes a base plate detachably connected to the sewing equipment, the base plate being hinged to the base plate, the base plate having an clearance groove adapted to the sewing groove, the clearance groove being used to place the lining fabric so as to sew the lining fabric to the inside of the zipper.

[0012] Furthermore, the bottom plate is provided with a flipping assembly on the side facing the base plate. The flipping assembly includes a pull tab and a folding tab. The bottom plate is provided with a sliding groove adapted to the pull tab. The pull tab is slidably connected to the bottom plate through the sliding groove. The folding tab is fixedly connected to the pull tab and extends toward the sewing groove for flipping the lining fabric.

[0013] Furthermore, the pull tab is provided with a positioning post, and the base plate is provided with a guide groove. The positioning post slides in the guide groove to limit the movement distance of the pull tab.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the coordinated operation of multiple positioning plates and precise slot design, the zipper, left trouser piece, right trouser piece, and lining are precisely and automatically positioned and sewn during the front placket sewing process. By using the template of this invention, all processes of the front placket manufacturing can be completed at once, making the operation simpler and more efficient. At the same time, the movable and adjustable third positioning plate, combined with the toothed meshing structure, can also adapt to the front placket sewing needs of different sizes within a certain range, improving the applicability of the template and eliminating the need to make separate templates for different sizes of trousers, thus reducing production costs. In addition, a base plate and a base plate are set up to rotate and connect with each other. By placing a lining between the base plate and the base plate, the lining and the zipper can be sewn together and fixed at the same time during sewing. This simplifies the operation process, reduces sewing steps, and improves production efficiency. At the same time, the addition of the lining also enhances the structural strength and wearing comfort of the front placket, meeting users' needs for a high-quality wearing experience. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 This is an exploded view of the overall structure of the present invention.

[0017] Figure 3 This is a schematic diagram of the structure of the base plate of the present invention.

[0018] Figure 4 This is a cross-sectional view of the left and right trouser panels, zipper, and lining fabric after they have been sewn and fixed according to the present invention.

[0019] Figure 5 This is a schematic diagram of the structure of the third positioning plate of the present invention.

[0020] Figure 6 This is a schematic diagram illustrating the effect of the third positioning plate of the present invention moving the maximum distance.

[0021] Figure 7 This is a schematic diagram illustrating the effect of the third positioning plate of the present invention moving the minimum distance.

[0022] Figure 8 This is a diagram showing the separation of the base plate and the substrate of the present invention. Figure 9 For the present invention Figure 2 Enlarged view of point M.

[0023] Figure 10 This is a schematic diagram of the structure of the fourth positioning plate of the present invention in this embodiment.

[0024] Figure 11 This is a schematic diagram of an embodiment of the slide groove of the present invention on the base plate.

[0025] Figure 12 This is a schematic diagram showing the position of the flipping component of the present invention before flipping the lining.

[0026] Figure 13 This is a schematic diagram showing the position of the flipping component of the present invention after the lining is flipped.

[0027] Reference numerals: 1-Base plate, 11-Bottom plate, 111-Guide groove, 112-Scale, 113-Slide groove, 114-Connector, 12-Sewing groove, 121-Bearing strip, 122-First groove, 123-Second groove, 124-First arc-shaped groove, 125-Limiting strip, 126-Limiting groove, 127-First adhesive part, 14-Auxiliary plate, 141-Second tooth, 15-Fixing piece, 151-First tooth, 16-First limiting piece, 17-Second limiting piece, 18-Allowing groove, 19-Flipping assembly, 191-Pull tab. 192-Folding piece, 193-Positioning post, 2-Zipper, 3-First positioning plate, 31-Second adhesive part, 4-Second positioning plate, 41-Positioning edge, 42-Needle strip, 5-Third positioning plate, 51-Transparent window, 52-Second arc groove, 521-Straight section, 522-First arc section, 523-Second arc section, 6-Fourth positioning plate, 61-Fourth groove, 62-Fifth groove, 621-Third arc section, 63-Positioning piece one, 64-Positioning piece two, 7-Right trouser piece, 8-Left trouser piece, 81-Front patch, 9-Liner. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0029] like Figure 1-13 As shown, the present invention provides a trouser front placket sewing template, including a base plate 1 detachably connected to a sewing device. A bottom plate 11 is hinged to the base plate 1, and a sewing groove 12 is provided on the bottom plate 11. A support strip 121 for placing the zipper 2 is provided in the sewing groove 12. The support strip 121 divides the sewing groove 12 into a first groove 122, a second groove 123, and a first arc-shaped groove 124 that are interconnected. One end of the first arc-shaped groove 124 corresponds to the end of the first groove 122, and the other end extends arc-shaped towards the second groove 123. When the zipper 2 is placed on the support strip 121, the right side of the zipper 2 corresponds to the first groove 122, and the left side of the zipper 2 corresponds to the second groove 123, which facilitates the needle to pass through the first groove 122 and the second groove 123 to sew the left and right sides of the zipper 2.

[0030] The base plate 11 has a positioning structure hinged to the side of the sewing groove 12 for fixing the trouser pieces, the trouser pieces including a right trouser piece 7 and a left trouser piece 8 (e.g., Figure 4 As shown), the right trouser piece 7 has a sewn edge connected to the right side of the zipper 2, and the left trouser piece 8 has a placket patch 81 connected to the left side of the zipper 2; the positioning structure includes a first positioning plate 3, a second positioning plate 4, a third positioning plate 5, and a fourth positioning plate 6, and the first positioning plate 3, the second positioning plate 4, the third positioning plate 5, and the fourth positioning plate 6 are respectively hinged to the base plate 11 on the side away from the sewing groove 12; wherein, the first positioning plate 3 and the second positioning plate 4 are both located on the same side of the sewing groove 12, and are respectively used to fix the right side of the zipper 2 and the right trouser piece 7. When the zipper 2 is placed on the support strip 121 in the sewing groove 12, the first positioning plate 3 is rotated so that the end of the first positioning plate 3 is pressed against the fabric piece on the right side of the zipper 2, for pre-positioning the zipper 2; The third positioning plate 5 is opposite to the first positioning plate 3 and located on the other side of the sewing groove 12. The third positioning plate 5 has a second arc-shaped groove 52. During sewing, the second arc-shaped groove 52 corresponds to the first arc-shaped groove 124. The fourth positioning plate 6 is located on one side of the top of the zipper 2. The fourth positioning plate 6 has a fourth groove 61 and a fifth groove 62. The fourth groove 61 corresponds to the first groove 122, and the fifth groove 62 corresponds to the second groove 123. When the fourth positioning plate 6 is flipped, it can simultaneously press and fix the left pant piece 8 and the right pant piece 7 to perform topstitching on the right pant piece 7, the left pant piece 8, and the zipper 2.

[0031] Specifically, such as Figure 2 , Figure 6-7 As shown, considering the different body shapes of different users, and to meet the different requirements of different users for the overall size of the front placket, a sliding structure is also provided between the base plate 11 and the third positioning plate 5, so that the third positioning plate 5 can slide relative to the base plate 11 to adjust the distance L between the second arc-shaped groove 52 and the zipper 2. The distance L is the length of the crotch seam at the end of the zipper 2, thereby changing the space of the front crotch position of the pants. When a larger size front placket needs to be sewn, the third positioning plate 5 is slid horizontally away from the zipper 2 to increase the distance L, which can adapt to the larger size requirement of the front crotch of the pants; when a smaller size front crotch needs to be sewn, the third positioning plate 5 is slid horizontally towards the zipper 2 to decrease the distance L, which can adapt to the smaller size requirement of the front crotch of the pants. The adjustment operation is simple and convenient, without the need for additional template replacement, and has stronger adaptability.

[0032] Furthermore, the sliding structure employs a toothed meshing structure for positioning adjustment, including a first tooth 151 and a second tooth 141 that mesh with each other. The first tooth 151 is disposed on the base plate 11, and the second tooth 141 is disposed on the third positioning plate 5. The second tooth 141 can slide and mesh relative to the first tooth 151, thereby changing the relative position of the third positioning plate 5 and the zipper 2. After sliding adjustment to the desired position, the toothed meshing structure can fix the position of the third positioning plate 5 by relying on the interlocking force between the teeth, without the need for an additional locking structure, making adjustment more convenient and positioning more stable, preventing displacement during sewing and ensuring sewing accuracy.

[0033] Furthermore, such as Figure 5As shown, the second arc-shaped groove 52 includes a straight section 521, a first arc-shaped section 522, and a second arc-shaped section 523 that are interconnected. The first arc-shaped section 522 and the second arc-shaped section 523 are located at the ends of the straight section 521 in sequence. The end of the straight section 521 facing the zipper 2 is open, so that the straight section 521 remains connected to the first groove 122 after the third positioning plate 5 is moved. By setting two arc-shaped sections on the same positioning plate at the same time, the user can freely choose to use the appropriate arc-shaped section according to actual needs without moving the third positioning plate 5 to adjust the position of the crotch of the pants, thereby improving the applicability of the template, making it more convenient and efficient to use. When the stitching dimensions of the first arc segment 522 and the second arc segment 523 do not meet the actual requirements, the position of the first arc segment 522 and the second arc segment 523 can be changed by sliding the third positioning plate 5, thereby increasing or decreasing the stitching curvature at the end of the front placket, meeting the design requirements of different trouser styles for the front placket shape, and further expanding the application scenarios of the template.

[0034] Specifically, when the third positioning plate 5 moves horizontally away from the zipper 2 and the first arc segment 522 or the second arc segment 523 is correspondingly attached to the side of the first arc groove 124 away from the zipper 2, the value of the spacing L is the largest, which can adapt to the arc sewing requirements of large-size front plackets. When the third positioning plate 5 moves toward the zipper 2 and the first arc segment 522 or the second arc segment 523 is aligned with the side of the first arc groove 124 closest to the zipper 2, the value of the spacing L is minimized. This can adapt to the arc sewing requirements of small-sized front plackets. The adjustment process is simple and intuitive, the arc matching is accurate, and it can quickly complete the adjustment of different sizes and shapes.

[0035] Furthermore, such as Figure 3 , Figure 5 As shown, the base plate 11 is also provided with a scale 112 below the first arc-shaped groove 124. The third positioning plate 5 is provided with a perspective window 51 corresponding to the scale 112 below the ends of the first arc-shaped segment 522 and the second arc-shaped segment 523. This allows the operator to intuitively read the current scale value through the perspective window 51 during the adjustment process, thereby quickly adjusting the third positioning plate 5 to the preset target position. This further improves the accuracy and efficiency of the adjustment, ensures that the front placket sewing size of trousers of the same specification is uniform, and reduces the defect rate.

[0036] Furthermore, such as Figure 6-7As shown, the base plate 11 is also provided with an auxiliary plate 14 and a fixing piece 15. The fixing piece 15 is fixedly connected to the base plate 11 by means of adhesive, snap-fit, screw, etc. The first tooth 151 is disposed on the fixing piece 15. The third positioning plate 5 is hinged to the auxiliary plate 14, and the second tooth 141 is disposed on the auxiliary plate 14. By driving the auxiliary plate 14 to move relative to the fixing piece 15, the third positioning plate 5 can be driven to move synchronously relative to the base plate 11, thereby conveniently adjusting the relative position between the third positioning plate 5 and the sewing groove 12. With the setting of the auxiliary plate 14 and the fixing piece 15, the toothed meshing structure can be pre-processed on the base plate 11, without the need to directly cut grooves on the base plate 11, reducing the overall processing difficulty of the template. At the same time, it is convenient to replace the components individually after the teeth wear down, reducing maintenance costs and extending the overall service life of the template.

[0037] Preferably, the base plate 11 is further provided with a first limiting piece 16 and a second limiting piece 17. The first limiting piece 16 and the second limiting piece 17 are respectively located on both sides of the auxiliary plate 14, and at least a portion of the first limiting piece 16 and the second limiting piece 17 respectively covers the edges on both sides of the auxiliary plate 14, thereby limiting and fixing the auxiliary plate 14 between the first limiting piece 16 and the second limiting piece 17, guiding the movement of the auxiliary plate 14 and ensuring the accuracy of the movement; at the same time, it can also ensure the stability of the first tooth 151 and the second tooth 141 when they mesh. In this embodiment, the first limiting piece 16 is located on the end of the fixing piece 15 away from the first tooth 151, ensuring the overall positioning stability of the auxiliary plate 14, avoiding accidental slippage or warping of the auxiliary plate 14 during adjustment or sewing, and improving structural stability.

[0038] Furthermore, such as Figure 3 As shown, to improve the convenience of placing the zipper 2, a limiting strip 125 is also provided on the support strip 121. The limiting strip 125 is generally U-shaped and surrounds the support strip 121 to form a limiting groove 126 that is adapted to the zipper 2. When one end of the zipper 2 is inserted into the limiting groove 126, the other end can be slid and pressed in the horizontal direction to make the zipper 2 automatically inserted into the limiting groove 126 under the limiting and guiding action of the limiting strip 125. This allows the limiting strip 125 to position the zipper 2, thereby improving the accuracy and efficiency of the zipper 2 placement and making the zipper 2 less prone to displacement, further ensuring the sewing precision.

[0039] Preferably, a first adhesive portion 127 (e.g., ...) may also be provided on the end face of the support strip 121. Figure 3As shown, when the zipper 2 is inserted into the limiting stop 125, the bottom end of the zipper 2 can be bonded to the first adhesive part 127, which further improves the stability of the zipper 2 after placement and prevents the zipper 2 from shifting during the pressing and positioning plate or sewing process; at the same time, the adhesive fixing is convenient to install and remove, and will not leave any residual marks on the zipper 2 fabric, thus not affecting the final appearance quality of the product.

[0040] Furthermore, the end of the first positioning plate 3 near the sewing groove 12 is provided with a second adhesive portion 31 (e.g., Figure 2 As shown), when the first positioning plate 3 is pressed against the right side of the zipper 2, the second adhesive part 31 is set upward. When the right trouser piece 7 is placed above the zipper 2, the seam edge of the right trouser piece 7 will be bonded to the second adhesive part 31 to pre-position the right trouser piece 7, prevent the right trouser piece 7 from shifting due to external force or vibration of the sewing equipment, and ensure the sewing accuracy of the zipper 2 and the right trouser piece 7.

[0041] Preferably, the first adhesive part 127 and the second adhesive part 31 can be made of low-viscosity, easy-to-peel pressure-sensitive adhesive, such as double-sided tape, sandpaper, etc., which can provide sufficient pre-fixing force and will not damage the trouser fabric or leave adhesive residue when the positioning plate is flipped open, thus ensuring the integrity and aesthetics of the trouser front placket fabric.

[0042] Furthermore, such as Figure 2 , Figure 9 As shown, the second positioning plate 4 has a positioning edge 41 for fixing the edge of the right trouser piece 7 and the right edge of the zipper 2. After the first positioning plate 3 pre-positions the zipper 2, the reverse side of the right trouser piece 7 is placed over the zipper 2, so that the seam edge of the right trouser piece 7 is aligned with the right side of the zipper 2. Then, the second positioning plate 4 is rotated so that the positioning edge 41 of the second positioning plate 4 is pressed against the seam edge of the right trouser piece 7, so that the right trouser piece 7 and the zipper 2 are pressed together synchronously to ensure the accuracy of subsequent sewing. Then, the right trouser piece 7 is flipped upward along the positioning edge 41 of the second positioning plate 4 so that the right trouser piece 7 covers the second positioning plate 4, so that the right side of the right trouser piece 7 faces upward and exposes the zipper 2, which facilitates the subsequent sewing of the left trouser piece 8 to the left side of the zipper 2.

[0043] The second positioning plate 4 has needle strips 42 spaced apart on its positioning edge 41. During sewing, the needle can pass through the gaps between the needle strips 42 to sew, preventing the needle strips 42 from obstructing the needle. At the same time, the needle strips 42 will slightly penetrate into the right pant piece 7, forming multi-point pressing on the right pant piece 7, and fixing the right pant piece 7 in a fixed position, equidistant positioning, and preventing deviation. Even without continuous hand pressure, it will not shift, further enhancing the stability of the right pant piece 7 during the sewing process and preventing wrinkles or displacement when the needle pierces. The needle strips 42 are made of smooth plastic material to avoid snagging or damaging the fabric when pressing the pant pieces together, and the spacing between adjacent needle strips 42 is adapted to the diameter of the sewing needle to ensure smooth needle passage.

[0044] In some embodiments, when the seam edge of the right trouser piece 7 and the right side of the zipper 2 are pressed together by the second positioning plate 4, the needle strip 42 is aligned with the first groove 122 and together forms a sewing guide structure. At this time, the sewing equipment can be driven so that the needle tip sews along the needle strip 42 of the second positioning plate 4 to sew and fix the seam edge of the right trouser piece 7 to the right side of the zipper 2. At this time, the sewing thread is a concealed thread. In some sewing processes, the concealed thread can be selected whether to sew it as needed.

[0045] In some sewing processes, to ensure that the right trouser piece 7 does not wrinkle or shift during the sewing of the concealed stitching on the right side of the zipper 2, the fourth positioning plate 6 can be rotated so that it covers the reverse side of the right trouser piece 7. At this time, the fourth groove 61 of the fourth positioning plate 6 corresponds to the first groove 122, and the needle can pass through the fourth groove 61 and the first groove 122 to perform concealed stitching on the right side of the right trouser piece 7 and the zipper 2, further ensuring sewing accuracy.

[0046] Further, after the right trouser piece 7 is sewn and fixed to the right side of the zipper 2, the left trouser piece 8 is placed face up on the zipper 2 and the right trouser piece 7, so that the edge of the placket patch 81 of the left trouser piece 8 is aligned with the left side of the zipper 2. Then, the third positioning plate 5 is flipped over and pressed against the crotch bend of the left trouser piece 8. Next, the sewing machine is driven so that the needle travels along the trajectory of the second arc groove 52 to complete the sewing and fixing of the left trouser piece 8 and the right trouser piece 7 relative to the end of the zipper 2. After sewing, the third positioning plate 5 is turned over, and then the fourth positioning plate 6 is flipped onto the left trouser piece 8. The sewing machine is driven so that the needle travels along the trajectory of the fifth groove 62 on the fourth positioning plate 6 to sew and fix the placket patch 81 on the left trouser piece 8 to the left side of the zipper 2. At this time, the sewing thread is a concealed thread. After sewing is completed, rotate and open the fourth positioning plate 6, and flip the left trouser piece 8 so that the right side of the left trouser piece 8 is facing up, in preparation for the next sewing step.

[0047] Furthermore, such as Figure 1 As shown, the fourth positioning plate 6 is located on one side of the top of the zipper 2 and is used to fix the left trouser piece 8 with its front facing up for a second time. The end of the fifth groove 62 has a third arc-shaped segment 621 extending towards the fourth groove 61. The third arc-shaped segment 621 is used to sew and fix the end of the zipper 2 to the left trouser piece 8. When the fourth positioning plate 6 is pressed against the front of the left trouser piece 8, the sewing device is driven so that the needle moves along the trajectory of the fifth groove 62 and the third arc-shaped segment 621, so that the front of the left trouser piece 8, the edge of the placket 81, and the end of the zipper 2 can be sewn and fixed, and a cover plate that covers the zipper 2 is formed on the left trouser piece 8. At this time, the stitching is visible.

[0048] like Figure 10 As shown, in this embodiment, the fourth positioning plate 6 includes two independent positioning pieces, a first positioning piece 63 and a second positioning piece 64. A gap is provided between the first positioning piece 63 and the second positioning piece 64. The gap corresponds to the first groove 122 and forms the fourth groove 61. The fifth groove 62 is provided on the second positioning piece 64. The end of the second positioning piece 64 away from the base plate 11 has a third arc-shaped segment 621 extending toward the first positioning piece 63. The third arc-shaped segment 621 communicates with the fifth groove 62. Thus, when it is necessary to sew the left trouser piece 8 or the right trouser piece 7, it is only necessary to rotate the corresponding first positioning piece 63 or the second positioning piece 64 to press it onto the left trouser piece 8 or the right trouser piece 7. It is not necessary to rotate the entire fourth positioning plate 6 every time it is sewn. The operation is more flexible and can also avoid the interference of the non-working positioning plate with the sewing process, improve the convenience of operation, and at the same time reduce the aging and wear caused by the long-term repeated bending of the entire positioning plate, and extend the service life of the template. Furthermore, by setting the positioning piece 63 and the positioning piece 64, raw materials can be saved, template manufacturing costs can be reduced, the overall weight of the template can be reduced, and the flipping and adjustment of each positioning plate can be made easier.

[0049] In some embodiments, the first positioning piece 63 and the second positioning piece 64 are integrally formed, which makes the overall structure of the fourth positioning plate 6 simpler, the processing and manufacturing more convenient, reduces assembly steps, and improves production efficiency.

[0050] Furthermore, such as Figure 1 , Figure 8As shown, to avoid friction and discomfort caused by direct contact between the zipper 2 and the skin, and to improve the overall aesthetics and wearing comfort of the pants, a lining 9 is usually sewn inside the zipper 2. However, existing sewing templates typically do not have the function of sewing the lining 9, so after sewing, the lining 9 needs to be positioned separately, which not only increases the complexity of the process, but also easily leads to misalignment between the lining 9 and the zipper 2 and the pant pieces, affecting the sewing accuracy and the quality of the finished pants. To address this problem, in this embodiment, the base plate 1 of the bottom plate 11 has an avoidance groove 18 that matches the sewing groove 12, and the lining 9 is placed on the avoidance groove 18. Before sewing, the base plate 11 can be rotated and the lining fabric 9 placed on the clearance groove 18 so that the right side of the lining fabric 9 corresponds to the first groove 122. Then, the base plate 11 is rotated to press it onto the base plate 1, thereby completing the pressing and positioning of the lining fabric 9. When sewing the right pant piece 7 and the right side of the zipper 2, the lining fabric 9 can be sewn simultaneously with the right pant piece 7 and the right side of the zipper 2 without the need for subsequent separate processing. This simplifies the overall sewing process and avoids the misalignment problem that occurs when the lining fabric 9 is sewn separately, effectively improving the sewing accuracy of the lining fabric 9 and ensuring the wearing comfort and aesthetics of the finished pants.

[0051] Furthermore, such as Figure 1 , Figure 12-13 As shown, to prevent the lining 9 from being simultaneously sewn and fixed when sewing the left side of the zipper 2 and the left pant piece 8, thus affecting the normal use of the pants, the bottom plate 11 is also provided with a flipping assembly 19 on the side facing the base plate 1. The flipping assembly 19 includes a pull tab 191 and a folding tab 192. The pull tab 191 is located between the sewing groove 12 and the fourth positioning plate 6 and is slidably connected to the bottom plate 11. The folding tab 192 is fixedly connected to the pull tab 191, so that the movement of the pull tab 191 can drive the folding tab 192 to move synchronously. The folding tab 192 extends towards the sewing groove 12 and is arranged parallel to the sewing groove 12. It is used to flip the lining 9 so that the side of the lining 9 facing the zipper 2 is folded to the area that is not involved in sewing. This avoids the lining 9 being accidentally sewn, ensures the correctness of the pants structure, eliminates the need to disassemble the accidentally sewn part after sewing is completed, reduces ineffective processing, and improves production efficiency.

[0052] Specifically, the base plate 11 is also provided with a sliding groove 113 adapted to the pull tab 191, and the pull tab 191 is slidably connected to the base plate 11 through the sliding groove 113. One end of the pull tab 191 is provided with a gripping part 194 extending outward from the base plate 11. During use, the operator can directly grip the gripping part 194 to push the pull tab 191 to slide without the need for additional tools, making operation more convenient. The other end of the pull tab 191 is provided with a positioning post 193 for limiting the movement of the pull tab 191. The base plate 11 is also provided with a guide groove 111, and the positioning post 193 slides within the guide groove 111 to limit the movement distance of the pull tab 191. When the positioning post 193 abuts against the guide groove 111, it means that the pull tab 191 has moved to the preset position. This ensures that the folding tab 192 can accurately drive the lining fabric 9 to complete the folding and avoidance, and also prevents the pull tab 191 from moving too far, thus occupying too much space and affecting the overall structural layout of the template. At the same time, it can also prevent the pull tab 191 from accidentally coming out, improve the structural reliability, and ensure the accuracy of the movement of the pull tab 191, improve the accuracy of the folding and positioning of the lining fabric 9, and reduce the probability of operational errors.

[0053] like Figure 12 As shown, before sewing, the lining fabric 9 is placed in the position of the relief groove 18, and the pull tab 191 is pulled to make the folding tab 192 correspond to the lining fabric 9. Then, the base plate 11 is pressed onto the base plate 1 to press and fix the lining fabric 9, and then the subsequent sewing steps can be carried out. like Figure 13 As shown, after one side of the lining 9 is sewn and fixed to the zipper 2 and the right trouser piece 7, when it is necessary to sew the left side of the zipper 2 to the left trouser piece 8, simply lift the bottom plate 11 slightly and then push the pull tab 191, so that the pull tab 191 drives the folding tab 192 to move synchronously. At this time, the folding tab 192 will push the lining 9 from the left side of the sewing groove 12 to the direction away from the sewing area of ​​the zipper 2, so that the lining 9 is separated from the sewing track of the left trouser piece 8 and the left side of the zipper 2. This avoids the lining 9 being mistakenly sewn into the connection between the left trouser piece 8 and the zipper 2, ensuring the correctness of the trouser structure. The operation is simple and convenient, without the need for manual insertion into the template gap to fold the lining 9, reducing the difficulty of operation, and will not disrupt the already positioned positions of the zipper 2 and trouser piece during the folding process, ensuring the overall sewing accuracy.

[0054] In some embodiments, the groove 113 is formed in ways including but not limited to the following two examples: Example 1: As Figure 10As shown, the base plate 11 has a through groove 113 extending vertically. One end of the pull tab 191 passes through the groove 113 from the upper end face of the base plate 11 and is located on the lower end face of the base plate 11, while the other end is located on the upper end face of the base plate 11. The gripping part 194 is located at one end on the upper end face of the base plate 11, and the positioning post 193 is located at one end on the lower end face of the base plate 11. This allows the pull tab 191 to move linearly relative to the base plate 11 under the guidance of the groove 113 and the guide groove 111, preventing the pull tab 191 from shifting during movement. Furthermore, this structure occupies less space above the base plate 11 and does not obstruct the placement or flipping of the trouser pieces and positioning plates, making the operation smoother.

[0055] Example 2: Figure 11 As shown, a connector 114 is detachably connected to the side of the base plate 11 near the substrate 1. The two sides of the connector 114 are fixed to the base plate 11 by screwing or bonding. A gap is provided between the connector 114 and the base plate 11, forming a groove 113. The pull tab 191 passes through the gap and slides in cooperation with the connector 114 and the base plate 11. In some embodiments, the groove 113 can also be provided on the connector 114. This structure not only eliminates the need to open a through groove on the base plate 11, thus not compromising the overall structural strength of the base plate 11, but also improves the structural stability of the base plate 11, extends the service life of the template, and makes disassembly and maintenance more convenient. When the pull tab 191 or the groove 113 is worn, only the corresponding part needs to be replaced, without replacing the entire base plate 11, thus reducing maintenance costs.

[0056] Preferably, the material of the lining 9 can be selected to match the fabric of the pants, such as cotton, polyester fiber, etc., to ensure that the performance and texture of the lining 9 are coordinated with the main fabric of the pants after sewing.

[0057] Preferably, the first positioning plate 3, the second positioning plate 4, the third positioning plate 5 and the fourth positioning plate 6 of the present invention are all made of magnetically attractive materials. Thus, when the positioning plates are pressed together, the positioning plates can be further fixed by magnetic attraction, thereby improving the stability of the pressing of the positioning plates and improving the sewing accuracy.

[0058] The working principle of this invention is explained in detail below: First, rotate the base plate 11 upwards and place the lining fabric 9 on the relief groove 18 of the base plate 1. Then, pull the pull tab 191 so that the pull tab 191 drives the folding tab 192 to move synchronously so that the position of the folding tab 192 corresponds to the lining fabric 9. Then, press the base plate 11 onto the base plate 1 to press and fix the lining fabric 9. Next, place the zipper 2 on the support strip 121 in the sewing groove 12 of the base plate 11, and manually slide and press the zipper 2 so that the bottom end of the zipper 2 is embedded in the limiting strip 125 and bonded to the first adhesive part 127; then rotate the first positioning plate 3 so that the first positioning plate 3 presses onto the fabric piece on the right side of the zipper 2; then, cover the zipper 2 with the reverse side of the right pant piece 7 so that the seam edge of the right pant piece 7 is aligned with the fabric piece on the right side of the zipper 2, and the seam edge of the right pant piece 7 is bonded to the second adhesive part 31 of the first positioning plate 3. Then rotate the second positioning plate 4 so that the second positioning plate 4 covers the first positioning plate 3. At the same time, the needle strip 42 on the second positioning plate 4 forms multi-point pressing on the right pant piece 7. At this time, if it is necessary to sew a hidden thread, the sewing equipment can be driven directly so that the needle passes through the gap of the needle strip 42 and moves along the edge of the second positioning plate 4, so that the hidden thread sewing of the right pant piece 7 and the right side of the zipper 2 can be completed. Then, flip the right trouser piece 7 upwards along the edge of the second positioning plate 4 until the front is facing up, exposing the zipper 2; next, flip the positioning piece 63 so that the positioning piece 63 presses onto the right trouser piece 7, and then drive the sewing machine so that the needle sews along the first groove 122, thereby completing the sewing and fixing of the right side of the zipper 2 with the right trouser piece 7 and the right side of the lining 9. Then, rotate and open the positioning piece 63. Next, place the left trouser piece 8, reverse side up, over the zipper 2 and the right trouser piece 7, so that the placket patch 81 of the left trouser piece 8 covers the fabric piece on the left side of the zipper 2. Flip the third positioning plate 5 and press it onto the left trouser piece 8, so that the second arc groove 52 corresponds to the first arc groove 124. Then, drive the sewing machine so that the needle moves along the trajectory of the first arc segment 522 or the second arc segment 523 on the third positioning plate 5, completing the sewing and fixing of the left trouser piece 8 and the right trouser piece 7 at the crotch. During this process, if it is necessary to adjust the sewing length of the trouser crotch, the engagement position of the second tooth 141 and the first tooth 151 can be manually adjusted to change the horizontal distance of the second arc groove 52 relative to the zipper 2, thereby adapting to the different sewing length requirements of the front placket of trousers of different sizes.

[0059] After the left trouser piece 8 and the right trouser piece 7 are sewn and fixed at the crotch, the bottom plate 11 is slightly lifted, and then the pull tab 191 is pushed so that the pull tab 191 drives the folding tab 192 to move synchronously, thereby causing the folding tab 192 to flip the unsewn end of the lining fabric 9 to the other side; then, the positioning piece 2 64 is rotated so that the positioning piece 2 64 is pressed onto the placket patch 81, and then the sewing equipment is driven to sew and fix the placket patch 81 to the left side of the zipper 2. Finally, flip the third positioning plate 5 and the second positioning piece 64 in sequence, then flip the left trouser piece 8 so that the right side of the left trouser piece 8 is facing up, and then flip the second positioning piece 64 again so that it is pressed against the right side of the left trouser piece 8. Drive the sewing machine so that the needle moves along the trajectory of the fifth groove 62 and the third arc segment 621 on the second positioning piece 64 to sew the right side of the left trouser piece 8, the edge of the placket patch 81, and the end of the zipper 2 together. This forms a cover on the left trouser piece 8 to conceal the zipper 2, thus completing the overall sewing of the front placket of the trousers. When opening the second positioning piece 64 to take out the trousers, simply pull the trousers up to open the first positioning plate 3 and the second positioning plate 4 at the same time. There is no need to open the positioning plates one by one, which further simplifies the material handling operation and improves sewing efficiency.

[0060] The innovation of this invention lies in the fact that through the coordinated operation of multiple positioning plates and precise slot design, it achieves precise, automated, and high-precision positioning and sewing of the zipper, left trouser piece, right trouser piece, and lining during the front placket sewing process. By using the template of this invention, all processes of the front placket manufacturing can be completed at once, making the operation simpler and more efficient. At the same time, through the movable and adjustable third positioning plate and the toothed meshing structure, it can also adapt to the front placket sewing needs of different sizes and specifications within a certain range, improving the applicability of the template and eliminating the need to make separate templates for different sizes of trousers, thus reducing production costs. In addition, a base plate and a base plate are set up to rotate and connect with each other. By placing a lining between the base plate and the base plate, the lining and the zipper can be sewn together and fixed at the same time during sewing. This simplifies the operation process, reduces sewing steps, and improves production efficiency. At the same time, the addition of the lining also enhances the structural strength and wearing comfort of the front placket, meeting users' needs for a high-quality wearing experience.

[0061] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0062] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A template for sewing the front placket of trousers, characterized in that, Includes a base plate (11), on which a sewing groove (12) is provided, and a support strip (121) for placing a zipper (2) is provided in the sewing groove (12). The support strip (121) divides the sewing groove (12) into a first groove (122), a second groove (123) and a first arc groove (124) that are interconnected. The base plate (11) is hinged to the side of the sewing groove (12) with a positioning structure for fixing the trouser piece. The positioning structure includes a first positioning plate (3), a second positioning plate (4), a third positioning plate (5) and a fourth positioning plate (6). The first positioning plate (3) and the second positioning plate (4) are both located on the same side of the sewing groove (12) and are used to fix the right side of the zipper (2) and the right trouser piece (7) respectively. The third positioning plate (5) is opposite to the first positioning plate (3) and located on the other side of the sewing groove (12). The third positioning plate (5) has a second arc-shaped groove (52). During sewing, the second arc-shaped groove (52) corresponds to the first arc-shaped groove (124). The fourth positioning plate (6) is located on one side of the top of the zipper (2). The fourth positioning plate (6) has a fourth groove (61) and a fifth groove (62). The fourth groove (61) corresponds to the first groove (122), and the fifth groove (62) corresponds to the second groove (123). Among them, a sliding structure is provided between the base plate (11) and the third positioning plate (5) so that the third positioning plate (5) can slide relative to the base plate (11) to adjust the distance L between the second arc groove (52) and the zipper (2).

2. The trouser front placket sewing template according to claim 1, characterized in that, The second arc-shaped groove (52) includes a straight section (521), a first arc-shaped section (522), and a second arc-shaped section (523) that are connected to each other. The first arc-shaped section (522) and the second arc-shaped section (523) are located at the ends of the straight section (521) in sequence. The third positioning plate (5) moves horizontally away from the zipper (2), and the spacing L is at its maximum when the first arc segment (522) or the second arc segment (523) is in contact with the side of the first arc groove (124) away from the zipper (2). When the third positioning plate (5) moves toward the direction close to the zipper (2) and the first arc segment (522) or the second arc segment (523) is in corresponding contact with the side of the first arc groove (124) close to the zipper (2), the spacing L is minimized.

3. The trouser front placket sewing template according to claim 2, characterized in that, The sliding structure includes a first tooth (151) and a second tooth (141) that mesh with each other. The first tooth (151) is disposed on the base plate (11), and the second tooth (141) is disposed on the third positioning plate (5). The second tooth (141) can slide and mesh with the first tooth (151).

4. The trouser front placket sewing template according to claim 3, characterized in that, The base plate (11) is also provided with an auxiliary plate (14) and a fixing plate (15). The fixing plate (15) is fixedly connected to the base plate (11) and the first tooth (151) is disposed on the fixing plate (15). The third positioning plate (5) is hinged to the auxiliary plate (14) and the second tooth (141) is disposed on the auxiliary plate (14). By driving the auxiliary plate (14) to move relative to the fixing plate (15), the third positioning plate (5) can be driven to move synchronously relative to the base plate (11).

5. The trouser front placket sewing template according to claim 1, characterized in that, The fourth positioning plate (6) includes two independent positioning pieces, a first positioning piece (63) and a second positioning piece (64). There is a gap between the first positioning piece (63) and the second positioning piece (64). The gap corresponds to the first groove (122) and forms the fourth groove (61).

6. The trouser front placket sewing template according to claim 5, characterized in that, The fifth groove (62) is disposed on the second positioning piece (64). The second positioning piece (64) has a third arc-shaped segment (621) extending toward the first positioning piece (63) at one end away from the base plate (11). The third arc-shaped segment (621) is connected to the fifth groove (62).

7. The trouser front placket sewing template according to claim 1, characterized in that, The support strip (121) is also provided with a limiting strip (125). The limiting strip (125) is in the shape of "U" and is surrounded by the support strip (121) to form a limiting groove (126) that is compatible with the zipper (2), which plays a guiding and positioning role for the zipper (2).

8. The trouser front placket sewing template according to claim 1, characterized in that, It also includes a base plate (1) detachably connected to the sewing equipment, the base plate (11) being hinged to the base plate (1), the base plate (1) having an avoidance groove (18) adapted to the sewing groove (12), the avoidance groove (18) being used to place the lining (9) so as to sew the lining (9) to the inside of the zipper (2).

9. A trouser front placket sewing template according to claim 8, characterized in that, The base plate (11) is also provided with a flipping assembly (19) on the side facing the base plate (1). The flipping assembly (19) includes a pull tab (191) and a folding tab (192). The base plate (11) is provided with a groove (113) that is adapted to the pull tab (191). The pull tab (191) is slidably connected to the base plate (11) through the groove (113). The folding tab (192) is fixedly connected to the pull tab (191) and extends toward the sewing groove (12) for flipping the lining fabric (9).

10. A trouser front placket sewing template according to claim 9, characterized in that, The pull tab (191) is provided with a positioning post (193), and the base plate (11) is provided with a guide groove (111). The positioning post (193) slides in the guide groove (111) to limit the movement distance of the pull tab (191).

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