A closed shoulder loop template and a sewing method for the closed shoulder loop.

Abstract

This invention discloses a closed shoulder loop template, comprising unit template groups and an inner lining plate. The unit template groups consist of two sets, each with a positioning through-hole that accommodates a folded shoulder loop fabric piece, the hole depth extending along the template thickness direction. Each unit template group includes two sets of insert plates that move within their own laying plane to fold the shoulder loop fabric piece. The inner lining plate is removably disposed in the positioning through-hole and is used to cover the fabric piece and define the folded edge position. The positioning through-holes of the two unit template groups are removable and interconnected. The two sets of insert plates are located at both ends of the positioning through-hole along its length, with a gap between the two sets of insert plates along the length of the hole for removing the inner lining plate. The closed shoulder loop template enables template-based production of closed shoulder loops, resulting in consistent shoulder loop product quality and wrinkle-free construction. This invention also discloses a shoulder loop sewing method based on the closed shoulder loop template.

Description

Technical Field

[0001] This invention relates to the field of garment manufacturing auxiliary devices, specifically to a closed shoulder loop template and a method for sewing closed shoulder loops. Background Technology

[0002] Closed shoulder loops have a closed, circular pressure seam. Closed asymmetrical shoulder loops have inconsistent shapes at both ends along their length; for example, the shoulder loop width may be inconsistent, or the shapes of the shoulder loop ends may be inconsistent. Figure 1 As shown, the width of the shoulder loop is a fixed size from one end to the middle section, and gradually narrows from the middle section to the other end.

[0003] Existing wrinkle-free templates are mostly used for shoulder straps and pockets with one open end. The main structure of the wrinkle-free template includes a main body and a pressure plate. The main body has a positioning through-hole to accommodate the shoulder strap fabric piece. The wrinkle-free template is used as follows: the pressure plate is pressed onto the fabric and into the positioning through-hole; together with the positioning through-hole, it defines the shape of the shoulder strap or the pocket surface; the edge of the shoulder strap or pocket fabric piece is folded along the edge of the pressure plate; after the edge of the fabric piece is folded, the pressure plate moves away from the main body through the shoulder strap opening or the pocket opening within its own laying plane, and the folded fabric piece in the positioning through-hole is fed into the sewing machine for pressing. This template and production steps are not applicable to... Figure 1 The closed asymmetrical shoulder loop. Summary of the Invention

[0004] One of the objectives of this invention is to overcome the deficiencies in the existing technology and provide a closed shoulder loop template to achieve template-based production of closed shoulder loops, resulting in consistent quality and wrinkle-free shoulder loop products.

[0005] To achieve the above-mentioned technical effects, the technical solution of the present invention is: a closed shoulder loop template, comprising:

[0006] The unit template group consists of two sets, each with a positioning through hole that accommodates the shoulder loop cut piece and extends in depth along the template thickness direction; it includes two sets of insert plates that move within their own laying plane and push the shoulder loop cut piece to fold the edge.

[0007] The inner lining plate is removably disposed in the positioning through hole and is used to press the cut piece and define the folding position;

[0008] The positioning through holes of the two sets of unit templates can be removed and connected; the two sets of insert plates are disposed at both ends of the positioning through holes along the length of the holes, and a gap for removing the inner liner is provided between the two sets of insert plates along the length of the holes.

[0009] A preferred technical solution is that at least one of the unit template groups includes a movable base plate, which is removable and blocked at one end of the positioning through hole.

[0010] A preferred technical solution is that the unit template group includes a movable pressure plate, which is positioned at one end of the positioning through hole; the unit template group is provided with a first translation channel in which the movable pressure plate moves within its own spreading plane; the movable pressure plate is provided with a sewing needle hole that runs through the thickness direction.

[0011] A preferred technical solution is that the sewing needle hole is an elongated hole, and the long side of the elongated hole intersects the side projection of the positioning through hole along the thickness direction of the unit template group.

[0012] A preferred technical solution is that the inner lining plate is an integral flat plate, and the shape of the inner lining plate is consistent with the shape and size of the shoulder loop.

[0013] A preferred technical solution is that the insert plate assembly includes two unit insert plates, each unit insert plate having a push-fold edge that abuts against the shoulder loop fabric piece. The push-fold edge includes a first side and a second side with an included angle. The first side is oriented in the same direction as the side edge of the positioning through hole extending along the hole length direction, and the second side is oriented in the same direction as one end edge of the positioning through hole.

[0014] A preferred technical solution is that the first translation channel is a channel that guides the movable pressure plate to move along the length of the hole.

[0015] A preferred technical solution is that the movable pressure plate has a first surface close to the through positioning hole, and the first surface is provided with a pressing part, which is disposed on the periphery of the sewing needle hole.

[0016] The second objective of this invention is to provide a sewing method for a closed shoulder loop, comprising the following steps:

[0017] S10: Cover the positioning through hole of the unit template group with the cut piece of the shoulder loop, press the inner lining plate on top of the cut piece and press it into the positioning through hole;

[0018] S20: Push the insert plate assembly at one end of the positioning through hole along its length to press the folded edge at one end of the shoulder loop onto the inner lining plate.

[0019] S30: The inner lining board is pulled out by translation, and the inner lining board is pressed over the insert plate group and the cut piece with folded edges in S2;

[0020] S40: Push the insert plate assembly at the other end of the positioning through hole along its length to press the folded edge at the other end of the shoulder loop onto the inner lining plate.

[0021] S50: The inner liner plate is pulled out by translation to obtain a single-sided shoulder loop workpiece with a circumferential folded edge.

[0022] The preferred technical solution further includes:

[0023] S60: Overlap the two sets of unit templates so that the folded edges of the two single-sided shoulder loop workpieces are close to being stacked.

[0024] S70: Remove the insert plate assembly until the folded edges of the two single-sided shoulder loop workpieces are overlapped and bonded;

[0025] S80: Press two of the single-sided shoulder loop workpieces at the folded edge position.

[0026] The advantages and beneficial effects of this invention are as follows:

[0027] The closed shoulder loop template has a reasonable structure. The two sets of insert plates are spaced apart in the longitudinal direction of the positioning through holes for removing the inner lining plate. After folding one end of the shoulder loop piece, the position of the inner lining plate is changed, and then the other end of the shoulder loop piece is folded again. Finally, the inner lining plate is removed through the gap between the two sets of insert plates, thus realizing the template-based production of the closed shoulder loop.

[0028] This template helps to automate the production of closed shoulder loops, thereby improving the quality consistency and production efficiency of shoulder loops;

[0029] The shoulder loop template produces shoulder loops with a flat surface, uniform and neat folding tension, meeting the requirements for wrinkle-free operation and helping to reduce energy consumption in shoulder loop production. Attached Figure Description

[0030] Figure 1 This is the front view of the shoulder strap;

[0031] Figure 2 This is the unfolded diagram of the closed shoulder loop template;

[0032] Figure 3 This is a structural diagram of the insert layer where the unit insert plate is located in the closed shoulder loop template;

[0033] Figure 4 This is another usage diagram of the insert layer where the unit insert plate is located in the closed shoulder loop template;

[0034] Figure 5 This is a structural diagram of the movable base plate and the movable pressure plate;

[0035] Figure 6 This is a schematic diagram of another usage configuration of the movable base plate and movable pressure plate;

[0036] Figure 7 This is a flowchart of the shoulder tab hem folding process;

[0037] Figure 8 yes Figure 6 A magnified view of part A in the image;

[0038] In the diagram: 1. Unit template group; 2. Inner lining plate; 3. Positioning through hole; 4. Insert plate group; 401. Unit insert plate; 5. Movable base plate; 6. Movable pressure plate; 601. Sewing needle hole; 602. Pressing part; 7. First translation channel; 8. Second translation channel; 9. Third translation channel; a. Shoulder loop. Detailed Implementation

[0039] The specific embodiments of the present invention will be further described below with reference to examples. These examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0040] In the description of this application, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating orientation or positional relationship are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0041] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0042] Example

[0043] like Figure 2-4 As shown, the embodiment of the closed shoulder loop template includes a unit template group 1 and an inner liner plate 2; the number of unit template groups 1 is two groups, and the unit template group 1 is provided with a positioning through hole 3 that accommodates the folded shoulder loop piece and the hole depth extends along the thickness direction of the template; the unit template group 1 includes two groups of insert plates that move within their own laying plane and push the folded edge of the shoulder loop piece; the inner liner plate 2 is removably disposed in the positioning through hole 3, and the inner liner plate 2 is used to press the piece and define the folded edge position; the positioning through holes 3 of the two units template groups 1 are removable and interconnected; the two groups of insert plates 4 are respectively disposed at both ends of the hole length direction of the positioning through hole 3, and a gap for removing the inner liner plate 2 is provided between the two groups of insert plates 4 along the hole length direction.

[0044] Hole length direction as Figure 1 As shown by the double-headed arrows at the top and bottom.

[0045] It is understandable that the inner lining plate 2 has a predetermined thickness and is flexible as a whole. The predetermined thickness ensures that it is not prone to local deformation when it is laid out on its own plane. When one edge of the inner lining plate 2 is pressed by the insert plate group 4, the operator can hold the other end and remove it from the gap until it is separated from the unit template group 1.

[0046] The shoulder loop is made by overlapping and pressing two loop surfaces together. Each unit template group 1 corresponds to one of the loop surfaces, and one unit template group 1 is used to produce one loop surface with folded edges. When the two loop surfaces with folded edges are located in the positioning through holes 3 of the two unit template groups 1 respectively, the overlapping unit template groups 1 are connected, the positioning through holes 3 are connected, the two loop surfaces are overlapped, and after pressing, a closed shoulder loop is obtained.

[0047] based on Figure 1 The shoulder loop has a symmetrical structure, and the inner lining plate 2 works in conjunction with the unit template group 1 to produce the loop surface with folded edges. There are one or two inner lining plates 2 corresponding to the closed shoulder loop template. When there is only one inner lining plate 2, the inner lining plate 2 is first used with one unit template group 1, and after being removed from the above unit template group 1, it is used with another unit template group 1.

[0048] In this embodiment, the insert plate assembly 4 has a push-folding station located within the positioning through hole 3 and a push-folding station located to the side of the positioning through hole 3. The spacing between the insert plate assemblies 4 along the length of the positioning through hole 3 specifically refers to the spacing between the insert plate assemblies 4 at the push-folding station. Conversely, if there is no spacing between the insert plate assemblies 4 at the push-folding station, the inner liner 2 will interfere with the movement of the back-folded insert plate assemblies 4, preventing them from being pushed to the predetermined push-folding station.

[0049] The two unit template groups 1 can be overlapped or detached from each other by means of hinges; alternatively, the two unit template groups 1 can also be separate and can be accurately overlapped by positioning parts such as concave-convex fitting parts or magnetic parts.

[0050] Based on the closed shoulder loop template of the above embodiments, the sewing method for the closed shoulder loop includes the following steps (indicated by...). Figure 7 (Taking an example where the edge of the center shoulder loop piece consists of edges A, B, C, D, E, F, G, and H):

[0051] S10: Cover the shoulder loop with the positioning through hole 3 of the cover unit template group 1, press the inner lining plate 2 on top of the cut piece and press it into the positioning through hole 3;

[0052] S20: Push the insert plate group 4 at one end of the hole length direction of the positioning through hole 3 to push the folded edge at one end of the shoulder loop to the top of the inner lining plate 2, that is, push and fold the A, B, C, and D edges. At this time, the insert plate group 4 pushed in S20 is the pushing and folding station.

[0053] S30: Move and pull out the inner lining plate 2, press the inner lining plate 2 onto the insert plate group 4 in S2 and the cut piece with folded edges. Due to the limitation of the positioning through hole 3, press the inner lining plate 2 onto the cut piece again, manually fold the E and F edges, and restrict the folded edge position by the hole wall of the positioning through hole 3. Then press the inner lining plate 2 onto the folded E and F edges and the insert plate group 4 of the push-folding station in S2.

[0054] S40: Push the insert plate group 4 at the other end of the hole length direction of the positioning through hole 3 to push the folded edge at the other end of the shoulder loop to the top of the inner liner plate 2, that is, push and fold the G and H edges. At this time, the insert plate group 4 pushed in S40 is the pushing and folding station, and the G and H folded edges are sandwiched between the inner liner plate 2 and the insert plate group 4 pushed in S40.

[0055] S50: Translate and pull out the inner liner plate 2 to obtain a single-sided shoulder loop workpiece with circumferential folded edges;

[0056] After completing S10-S50 for both unit templates, continue with the following steps:

[0057] S60: Stack the two sets of unit templates 1 together so that the folded edges of the two single-sided shoulder loop workpieces are close to being stacked.

[0058] S70: Remove insert plate group 4 until the folded edges of the two single-sided shoulder loop workpieces are overlapped and bonded;

[0059] S80: Two single-sided shoulder loop workpieces are pressed at the folded edge position.

[0060] In S30, translational extraction refers to bending the inner liner 2 located outside the S20 insert plate group 4 so that the inner liner 2 located below the S20 insert plate group 4 is locally kept in a translational state.

[0061] When CDEF is combined with ABCD to form the same shape, the resulting shoulder loop is a closed symmetrical shoulder loop. The above steps are also applicable to the production of closed symmetrical shoulder loops.

[0062] like Figure 5-6 As shown, in another preferred embodiment, at least one unit template group 1 includes a movable base plate 5, which can be removed and blocked at one end of the positioning through hole 3.

[0063] Understandably, the movable base plate 5 can be removed and positioned at the opening of the positioning through hole 3, which is far from the overlapping surface of the unit template group 1.

[0064] When unit template group 1 is placed on the work surface, the work surface can serve as the bottom surface of the positioning through hole 3, determining the position of the inner lining plate 2 in the depth direction of the positioning through hole 3. However, when the edge of the cut piece is folded over, the cut piece and the inner lining plate 2 are completely located in the positioning through hole 3. During the process of moving unit template group 1 to overlap with another unit template group 1, the cut piece detaches from the work surface, and the assembly of the cut piece and the inner lining plate 2 may detach from unit template group 1 through the opening of the positioning through hole 3 near the work surface. The movable base plate 5 is positioned at the opening as the bottom surface of the positioning through hole 3. When the two unit template groups 1 are overlapped, the movable base plate 5 is removed, and the loop surface inside the unit template group 1 is unobstructed, satisfying the seam pressing conditions.

[0065] The movable base plate 5 can also be set in two unit template groups 1 at the same time, but usually the other unit template group 1 is covered on top of the unit template group 1 whose position remains unchanged. Therefore, it is preferable that only one unit template group 1 includes the movable base plate 5.

[0066] In this embodiment, the movable base plate 5 switches its position by translating along its own spreading direction. Therefore, a second translation channel 8 for the movable base plate 5 is also provided within the unit template group 1. Furthermore, a handle for driving the movable base plate 5 to translate is also provided on the outer edge of the unit template group 1. The translation direction of the movable base plate 5 is as follows: Figure 5 As shown by the double-headed arrows pointing left and right.

[0067] Alternatively, the movable base plate 5 can also be connected to the surface of the unit template assembly other than the movable base plate via magnetic attachments, so as to achieve quick separation of the movable base plate from the assembly.

[0068] like Figure 5-6 As shown, in another preferred embodiment, a unit template group 1 includes a movable pressure plate 6, which is positioned at one end of the positioning through hole 3; the unit template group 1 is provided with a first translation channel 7 for the movable pressure plate 6 to move within its own spreading plane; the movable pressure plate 6 is provided with a sewing needle hole 601 that runs through the thickness direction.

[0069] Sewing equipment, such as a template machine, has its sewing needle inserted into the sewing needle hole 601. The sewing needle moves along a predetermined stitch, and the movable base plate 5 moves with the sewing needle. Its function is to fully press the loop surface of the non-sewing area to prevent deformation of the fabric piece in the non-sewing area, especially for folds with many layers, such as folds that return to their original position in the opposite direction of the fold. This reduces the probability of defects such as uneven shoulder loop edges and smooth shoulder loop corners. The sewing needle pierces the two fabric pieces one after the other, pressing the two overlapping loop surfaces together to prevent relative displacement between the two fabric pieces, reducing the probability of uneven loop surfaces and wrinkles.

[0070] It is understood that the movement of the movable base plate 5 within its own spreading plane includes, but is not limited to, movement along the length or width direction of the positioning hole (perpendicular to the length direction of the hole).

[0071] Furthermore, one unit template is equipped with a movable base plate 5, and another unit template is equipped with a movable pressure plate 6. When preparing to press the seam, the movable pressure plate 6 is located on the top layer of the two stacked unit templates, and the movable base plate 5 is located below the two layers of cut pieces. At this time, removing the movable base plate 5 minimizes the impact of the translation method on the cut pieces.

[0072] like Figure 5 , 6 As shown in Figure 8, in another preferred embodiment, the sewing needle hole 601 is an elongated hole, and the long side of the elongated hole along the thickness direction of the unit template group 1 intersects the side projection of the positioning through hole 3. Taking one side of the seam shoulder loop as an example, when the long side of the elongated hole is parallel to the side projection of the positioning through hole 3 along the thickness direction of the unit template group 1, the length of the unpressed part of the seam sealing edge is relatively long, which will also lead to the above-mentioned problems such as hem recovery and relative displacement of the cut pieces.

[0073] like Figure 2 As shown, in another preferred embodiment, the inner liner 2 is a one-piece flat plate, and the shape and dimensions of the inner liner 2 are consistent with the shape and dimensions of the shoulder loop. Compared with the inner liner 2 having a connecting structure, the one-piece flat plate has stable dimensions and a long service life.

[0074] The inserts in insert group 4 can be selected to correspond one-to-one with a single edge of the positioning hole. For example, one insert may correspond only to edge A, and another insert may correspond only to edge B, used to push and fold the corresponding edges of the cut pieces.

[0075] like Figure 3-4 As shown, in another preferred embodiment, the insert plate group 4 includes two unit insert plates 401. The unit insert plate 401 has a push-fold edge that abuts against the shoulder loop piece. The push-fold edge includes a first side and a second side with an included angle. The first side is aligned with the side edge of the positioning through hole 3 extending along the length of the hole, and the second side is aligned with one end edge of the positioning through hole 3. Figure 3 The double-headed arrows indicate the translation direction of the unit insert 401.

[0076] The template includes a plate layer, which, in addition to the unit plates, also includes a third translation channel 9 for the guide unit plates 401 to move within their own spreading plane.

[0077] Figure 7In this design, unit inserts 401 are simultaneously positioned corresponding to two sides, namely AC, BD, GE, and HF. Besides reducing the number of push-pull actions required by the template operator, the angled unit inserts 401 exhibit lower deformation, especially at the angle. Since the folded edge at the angle often has more than one layer, the insert structure with the angled push-fold is more rational compared to unit inserts 401 with a single side, and it also helps maintain the shape of the shoulder loop end angle during the seam pressing process. Taking GE as an example, the trimmed edge is layered at point b, and the unit insert 401 pushes the folded edge at point B to fold upwards towards the inner lining plate 2. The low deformation at the angle of the unit insert 401 is more conducive to maintaining the amount of folding.

[0078] like Figure 5-6 As shown, in another preferred embodiment, the first translational channel 7 is a channel for guiding the movable pressure plate 6 to move along the length of the hole, and the translational direction of the movable pressure plate 6 is as follows: Figure 5 As indicated by the double-headed arrows, the channel is defined by limiting protrusions located on the left and right sides of the movable pressure plate 6. The stitching of the shoulder loop is a closed loop, consistent with the outline shape of the loop surface and slightly smaller than the size of the loop surface. The elongated hole is positioned directly opposite the width direction of the loop surface after the edge is folded over, and the sewing needle moves within the elongated hole.

[0079] The length of the shoulder loop is much greater than its width. During the pressing process, the loop surface slides and rubs against the movable pressing plate 6. The shoulder loop fabric pieces are mostly folded along the width direction of the loop surface, or the folding direction is slightly deviated from the width direction of the loop surface. If the movable pressing plate 6 moves along the width direction of the positioning hole (the width direction of the loop surface), the friction between the single-layer fold and the fabric of the loop surface is small. As a result, the loop surface of the upper fabric piece will be offset relative to its fold and the lower fabric piece, causing the ABEF fold of the upper and lower fabric pieces to be misaligned, increasing the defect rate of the shoulder loop. Although the movable pressing plate 6 moves along the length direction of the positioning hole (the length direction of the loop surface) and there is also a tendency for the loop surface to shift, the more wrinkles at the end fold will increase the friction between the fold and the loop surface, thus reducing the shift of the loop surface.

[0080] Furthermore, the direction of the elongated hole is consistent with the width direction of the positioning hole. Based on the same elongated hole, the angle between the long side direction and each side of the loop surface is relatively large, and the length of the side exposed in the elongated hole tends to be smaller. When pressing the seam, the length of the side pressed by the movable pressure plate 6 is larger, so that the shape change of the loop surface before and after pressing the seam tends to be smaller or no change.

[0081] like Figure 8 As shown, in another preferred embodiment, the movable pressure plate 6 has a first surface close to the through-hole 3, and a pressing part 602 is raised on the first surface. The pressing part 602 is disposed around the sewing needle hole 601. The pressing part 602 increases the pressing force on the periphery of the sewing needle hole 601, optimizing the positioning effect of the movable pressure plate 6 on the loop surface. Optionally, the pressing part 602 is a sheet of the same material as the template.

[0082] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for sewing closed shoulder loops, characterized in that, Based on the closed shoulder loop template, the closed shoulder loop template includes: The unit template group consists of two sets, each with a positioning through hole that accommodates the shoulder loop cut piece and extends in depth along the template thickness direction; it includes two sets of insert plates that move within their own laying plane and push the shoulder loop cut piece to fold the edge. The inner lining plate is removably disposed in the positioning through hole and is used to press the cut piece and define the folding position; The positioning through holes of the two sets of unit templates can be removed and connected; the two sets of insert plates are disposed at both ends of the positioning through holes along the length of the holes, and a gap for removing the inner liner is provided between the two sets of insert plates along the length of the holes. At least one of the unit template groups includes a movable base plate, which is removable and blocked at one end of the positioning through hole; The unit template assembly includes a movable pressure plate, which is positioned at one end of the positioning through hole; the unit template assembly has a first translation channel within which the movable pressure plate can move within its own spreading plane; the movable pressure plate has a sewing needle hole that extends through the thickness direction. The sewing method includes the following steps: S10: Cover the positioning through hole of the unit template group with the cut piece of the shoulder loop, press the inner lining plate on top of the cut piece and press it into the positioning through hole; S20: Push the insert plate assembly at one end of the positioning through hole along its length to press the folded edge at one end of the shoulder loop onto the inner lining plate. S30: The inner lining board is pulled out by translation and pressed onto the insert plate group and the cut piece with folded edges in S20. S40: Push the insert plate assembly at the other end of the positioning through hole along its length to press the folded edge at the other end of the shoulder loop onto the inner lining plate. S50: The inner liner plate is pulled out by translation to obtain a single-sided shoulder loop workpiece with a circumferential folded edge.

2. The sewing method for the closed shoulder loop according to claim 1, characterized in that, The sewing needle hole is an elongated hole, and the long side of the elongated hole intersects the side projection of the positioning through hole along the thickness direction of the unit template group.

3. The sewing method for the closed shoulder loop according to claim 1, characterized in that, The inner lining plate is a one-piece flat plate, and the shape and size of the inner lining plate are consistent with the shape and size of the shoulder loop.

4. The sewing method for the closed shoulder loop according to claim 1, characterized in that, The insert assembly includes two unit inserts, each unit insert having a push-fold edge that abuts against the shoulder loop piece. The push-fold edge includes a first side and a second side with an included angle. The first side is aligned with the side edge of the positioning through hole extending along the hole length direction, and the second side is aligned with one end edge of the positioning through hole.

5. The sewing method for the closed shoulder loop according to claim 2, characterized in that, The first translation channel is a channel that guides the movable pressure plate to move along the length of the hole.

6. The sewing method for the closed shoulder loop according to claim 1, characterized in that, The movable pressure plate has a first surface close to the through positioning hole, and the first surface is provided with a pressing part, which is located around the sewing needle hole.

7. The sewing method for the closed shoulder loop according to claim 1, characterized in that, Also includes: S60: Overlap the two sets of unit templates so that the folded edges of the two single-sided shoulder loop workpieces are close to being stacked. S70: Remove the insert plate assembly until the folded edges of the two single-sided shoulder loop workpieces are overlapped and bonded; S80: Press two of the single-sided shoulder loop workpieces at the folded edge position.

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