Sewing jig for multi-layered wrapping harness

Abstract

This invention discloses a sewing fixture for multi-layer bag straps, comprising an upper groove, a middle groove, and a lower groove arranged sequentially. The front ends of the upper and lower grooves are output ports, and the rear ends are input ports, with the output ports of the upper and lower grooves centrally aligned. Similarly, the front end of the middle groove is also an output port, and the rear end is an input port. The output ports of the upper, middle, and lower grooves are arranged vertically, close together. The middle groove includes a left groove and a right groove arranged symmetrically, equidistant from the sides of the upper and lower grooves. Both the left and right grooves include C-shaped guide grooves. The C-shaped openings of the two C-shaped guide grooves are positioned opposite each other, with the width of the C-shaped opening gradually decreasing from back to front. Each C-shaped guide groove contains a C-shaped channel that extends from back to front, with the width of the C-shaped channel also gradually decreasing from back to front. This allows for precise automatic alignment of the layers in a three-layer structure.

Description

Technical Field

[0001] This invention relates to the field of sewing machine accessories technology, and in particular to a sewing fixture for multi-layer bag straps. Background Technology

[0002] Common handbags, backpacks and other luggage products are equipped with shoulder straps or handles so that you can lift the bag by holding the handle or carry the backpack by the shoulder strap. However, the existing shoulder straps or handles are made of hard materials and have a poor feel. Over a long period of time, they will tighten or rub against the hands and / or shoulders, causing redness, swelling or even abrasions.

[0003] Therefore, as Figure 1 As shown, a multi-layered bag strap structure includes three layers 200: the upper layer 201 and the lower layer 203 are PU (polyurethane) layers to improve the feel of the strap. The middle layer 202 includes two independent support layers 204, each of which includes webbing 205 and boning 206. The boning 206 is sandwiched inside the C-shaped webbing 205 to provide support and rigidity. This strap structure can also be used to make a handle structure. Due to the soft material and the support of the boning 206, it can effectively improve the feel of the strap and reduce friction. However, during the production of this shoulder strap structure, it is necessary to first apply glue to the webbing 205 and then wrap and fix it to the glue core 206. Next, glue is applied to both sides of the upper layer 201 and the lower layer 203, so that the two support layers 204 are respectively adhered and fixed between the upper layer 201 and the lower layer 203. Finally, the strap is sent to a sewing machine to sew the two support layers 204, the upper layer 201, and the lower layer 203 with sewing thread 207 for reinforcement. This results in the production of this shoulder strap requiring a large amount of glue, leading to high production costs, difficult operation, and high labor intensity. Furthermore, manually applying glue for adhesion makes it difficult to accurately position the two support layers 204 on both sides of the upper layer 201 and the lower layer 203, causing misalignment and resulting in poor product quality and a low yield rate. Summary of the Invention

[0004] The purpose of this invention is to provide a sewing fixture for multi-layer bag straps, which has the advantages of reducing production costs and labor intensity, effectively ensuring product quality, and greatly improving yield.

[0005] To achieve the above objectives, the solution of the present invention is:

[0006] Sewing jig for multi-layer bag straps;

[0007] It includes an upper tank, a middle tank, and a lower tank arranged sequentially from top to bottom;

[0008] The front ends of the upper and lower tanks are both output ports, and the rear ends are both input ports. The output ports of the upper and lower tanks are centered and aligned.

[0009] The front end of the middle tank is also an output port, and the rear end is an input port. The output ports of the upper tank, middle tank and lower tank are arranged in close succession.

[0010] The middle tank includes a left tank and a right tank arranged symmetrically on the left and right sides, and the left tank and the right tank are aligned with the two sides of the upper tank and the lower tank at equal distances on the left and right, respectively.

[0011] Both the left and right grooves include C-shaped guide grooves; the C-shaped openings of the two C-shaped guide grooves are arranged opposite each other, the width of the C-shaped opening of each C-shaped guide groove gradually decreases from back to front, and each C-shaped guide groove is provided with a C-shaped channel that runs through the front and back, the width of the C-shaped channel also gradually decreases from back to front.

[0012] Furthermore, the width of the rear opening of the C-shaped opening is greater than the width of the front opening, and a limiting block is provided at the front opening of the C-shaped opening, forming a front guide hole between the limiting block and the C-shaped opening.

[0013] Furthermore, a limiting ring is provided at the rear opening of the C-shaped opening, and a rear guide hole is formed between the limiting ring and the C-shaped opening.

[0014] Furthermore, the C-shaped guide groove includes an outer wall and an inner wall, and the inner wall and the outer wall form the C-shaped channel; the width of the rear inlet of the C-shaped channel is greater than the width of the front outlet of the C-shaped channel.

[0015] Furthermore, each output port at the front end of the sewing fixture constitutes an output end, and the output end is provided with two baffles; the two baffles are arranged on the left and right, the height of the baffles is greater than the thickness of the three-layer structure, and the baffles extend forward from the output end.

[0016] Furthermore, the two baffles are respectively connected to the left and right sides of the output port of the middle tank.

[0017] Furthermore, the inlet of the middle tank is provided with two guides, which are respectively located on the outer side of the rear end of the two C-shaped guide grooves of the middle tank.

[0018] Furthermore, the sewing fixture also includes a mounting plate, which is connected and disposed below the lower groove body; the middle groove body and the upper groove body are detachably connected to the mounting plate by multiple support legs; the mounting plate is also provided with a fixed long groove for mounting and locking the sewing fixture onto the sewing machine.

[0019] Furthermore, the left and right sections of the middle tank are each connected to a support leg, with one end of each support leg connected to the middle tank and the other end having a support leg slot; the support leg slots are respectively fitted onto the mounting plate.

[0020] Furthermore, the input ports at the rear end of the sewing fixture are spaced apart from each other; the top surfaces of the upper and lower grooves are provided with opening structures that connect the internal channels of the upper and lower grooves.

[0021] After adopting the above technical solution, the output ports of the upper and lower tanks respectively output the upper and lower PU layers, while the left and right tanks of the middle tank simultaneously output the two middle support layers. The narrow C-shaped webbing with glue in the support layers is clamped and fixed by the upper and lower PU layers. That is, the three-layer structure output from the front end of the sewing fixture can maintain precise alignment without the use of glue and can be directly sewn by the sewing machine needle. By simultaneously sewing threads on the left and right sides of the three-layer structure, the upper and lower PU layers are firmly sewn and fixed to the middle support layers on the left and right sides respectively. The sewing fixture of this invention can replace the existing manual glue application, achieving precise automatic alignment and arrangement. Once the three layers are aligned, they can be continuously fed to the sewing machine needles for stitching, effectively improving production efficiency and significantly reducing glue usage. While reducing costs, it also minimizes the hazards of glue use, reduces manual labor intensity, and improves the working environment for workers. The upper, middle, and lower grooves ensure the accuracy of the overlapping positions of the layers, thereby improving the quality of multi-layer bag straps produced, preventing sewing distortion, and greatly increasing the product yield. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of the product manufactured according to the present invention.

[0023] Figure 2 This is a schematic diagram illustrating the operation of an embodiment of the present invention.

[0024] Figure 3 This is a front-view perspective view of an embodiment of the present invention.

[0025] Figure 4 This is an exploded view of an embodiment of the present invention.

[0026] Figure 5 This is a front view of an embodiment of the present invention.

[0027] Figure 6 This is a top view of an embodiment of the present invention.

[0028] Figure 7 This is a side view of an embodiment of the present invention.

[0029] Figure 8 This is a rear-view perspective view of an embodiment of the present invention.

[0030] Figure 9 This is a perspective view of the right groove body according to an embodiment of the present invention.

[0031] Figure 10 This is a schematic diagram illustrating the fit between the right groove body, webbing, and glue in an embodiment of the present invention.

[0032] Symbol descriptions: Sewing jig 100, output end 101, input end 102, upper groove 10, middle groove 20, lower groove 30, left groove 40, right groove 50, C-shaped guide groove 1, C-shaped opening 11, rear opening 111, front opening 112, outer wall 12, inner wall 13, C-shaped channel 14, rear inlet 141, front outlet 142, limiting ring 2, rear guide hole 21, limiting block 3, front guide hole 31, baffle 4, guide 5, support leg 6, support leg long groove 61, screw 7, opening structure 8, internal channel 9, mounting plate 60, mounting hole 601, fixing long groove 602, three-layer structure 200, upper layer 201, middle layer 202, lower layer 203, support layer 204, webbing 205, glue 206, sewing thread 207. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] In the description of the embodiments of this application, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0035] Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" and "several" mean two or more, unless otherwise explicitly specified.

[0036] In the description of the embodiments of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The following disclosure provides many different implementations or examples for carrying out different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or reference letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0039] Furthermore, this application provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0040] like Figures 2 to 8 As shown, the sewing fixture 100 for the multi-layer bag strap of the present invention is mounted on a sewing machine (not shown). The output end 101 of the sewing fixture 100 is close to the needle position of the sewing machine and is used to automatically arrange and align the three-layer structure 200 of the multi-layer bag strap structure, and then output it to the needle position for sewing and fixing. The rear end of the sewing fixture 100 is the input end 102, which is used to input the materials of the three-layer structure 200.

[0041] The sewing fixture 100 includes an upper groove 10, a middle groove 20, and a lower groove 30 arranged sequentially from top to bottom.

[0042] The front ends of the upper tank 10 and the lower tank 30 are both output ports, and the rear ends are both input ports. The output ports of the upper tank 10 and the lower tank 30 are centered and aligned, and are used to align and output the PU layers of the upper layer 201 and the lower layer 203 respectively.

[0043] The front end of the middle tank 20 is also an output port, and the rear end is an input port. The output ports of the upper tank 10, middle tank 20, and lower tank 30 are arranged vertically adjacent to each other (see [reference]). Figure 5 ).

[0044] The middle tank 20 includes a left tank 40 and a right tank 50 arranged symmetrically on the left and right sides, and the left tank 40 and the right tank 50 are aligned with the two sides of the upper tank 10 and the lower tank 30 at equal distances on the left and right sides, respectively.

[0045] Both the left groove 40 and the right groove 50 include C-shaped guide grooves 1, with the C-shaped openings 11 of the two C-shaped guide grooves 1 arranged opposite to each other, such as... Figure 9 As shown, the C-shaped opening 11 of the C-shaped guide groove 1 gradually narrows from back to front, making the width of the rear opening 111 of the C-shaped opening 111 greater than the width of the front opening 112. The C-shaped guide groove 1 includes an outer wall 12 and an inner wall 13. The inner side of the inner wall 13 is the C-shaped opening 11. A C-shaped channel 14 is formed between the inner wall 13 and the outer wall 12, which runs through the front and back. The width of the C-shaped channel 14 also gradually narrows from back to front, that is, the width of the rear inlet 141 of the C-shaped channel 14 is greater than the width of the front outlet 142 of the C-shaped channel 14. Thus, as... Figure 10 As shown, the planar webbing 205 enters from the wide rear inlet 141 of the C-shaped channel 14 and exits from the narrow front outlet 142, and can be transformed into a narrow C-shaped webbing 205.

[0046] The widths of the C-shaped opening 11, the rear opening 111, and the front opening 112, as well as the widths of the C-shaped channel 14, the rear inlet 141, and the front outlet 142, all refer to the distance between the two ends of the C-shape.

[0047] Meanwhile, a limiting ring 2 is provided at the rear opening 111 of the C-shaped guide groove 1, and a limiting block 3 is provided at the front opening 112. A rear guide hole 21 is formed between the limiting ring 2 and the inner wall 13, and a front guide hole 31 is formed between the limiting block 3 and the inner wall 13. The rear inlet 141 of the C-shaped channel 14 is enclosed in the rear guide hole 21, and the front outlet 142 is enclosed in the front guide hole 31. Thus, as Figure 10As shown, the glue 206 enters through the rear guide hole 21 of the rear opening 111 and exits through the front guide hole 31. It is accurately covered and positioned by the narrow C-shaped webbing 205, thus allowing the left and right slots 40 and 50 to respectively output the webbing 205 containing the glue 206. That is, the middle slot 20 can simultaneously output the support layers 204 on the left and right sides of the middle layer 202, while the glue 206 of the support layer 204 is C-shaped covered and positioned by the webbing 205. Simultaneously, the two limiting rings 2 of the left and right slots 40 and 50 can be staggered to avoid interference.

[0048] In this way, such as Figure 2 As shown, the output ports of the upper groove 10 and the lower groove 30 respectively output the upper 201PU layer and the lower 203PU layer, which are set up vertically. The left groove 40 and the right groove 50 of the middle groove 20 simultaneously output two support layers 204. The narrow C-shaped webbing 205 of the support layer 204, which is wrapped with glue 206, is clamped and fixed by the upper 201PU layer and the lower 203PU layer. That is, the three-layer structure 200 output by the output end 101 of the sewing jig 100 can maintain precise alignment without the use of glue. It can be directly sewn by the sewing machine needle. By simultaneously sewing the seams on the left and right sides of the three-layer structure 200, the upper 201PU layer, the lower 203PU layer and the middle support layer 204 on the left and right sides are firmly sewn and fixed. The output end 101 of the sewing jig 100 can be used with a conveying drive (not shown). The conveying drive can guide the three-layer structure 200 of the output end 101 of the sewing jig 100 forward continuously, while the input end 102 at the rear end of the sewing jig 100 continuously inputs materials to achieve efficient and automated production.

[0049] like Figure 2 and Figure 4 As shown, the output end 101 of the sewing jig 100 is composed of the above-mentioned output ports. Two baffles 4 can also be provided at the output end 101. The two baffles 4 are arranged on the left and right sides. The baffles 4 have a certain height, which can be greater than the thickness of the three-layer structure 200. The baffles 4 extend forward from the output end 101 to limit the left and right sides of the three-layer structure 200 and prevent the middle layer 202 support layer 204 of the three-layer structure 200 from separating in the left and right directions.

[0050] The two baffles 4 can be directly welded to the left and right sides of the output port of the middle tank 20.

[0051] like Figure 2 and Figure 8As shown, the inlet of the middle groove 20 of the sewing fixture 100 can also be provided with two guides 5. The two guides 5 are respectively set on the outside of the rear opening 111 of the two C-shaped guide grooves 1 of the middle groove 20. The guides 5 are wavy, comb-shaped, eye-shaped, dovetail clip-shaped, etc., and can be used to guide the flat webbing 205 to smoothly enter the rear inlet 141 of the C-shaped channel 14, avoid the webbing 205 from getting tangled and stuck, and improve production efficiency.

[0052] See Figure 4 The sewing jig 100 also includes a mounting plate 60, which is located below the lower groove 30. The lower groove 30 can be directly welded or detachably fixed to the middle of the mounting plate 60. The middle groove 20 and the upper groove 10 are detachably connected to the mounting plate 60 by multiple supports 6. Each of the middle groove 20 and the upper groove 10 has a support 6 on its left and right sides. In this embodiment, there are a total of four supports 6. The left groove 40 and the right groove 50 of the middle groove 20 are each connected to a support 6, and one end of each support 6 is respectively... Welded to the middle tank 20 or the upper tank 10, the other end is provided with a support leg slot 61; the two sides of the mounting plate 60 are respectively provided with four mounting holes 601, and there are a total of eight mounting holes 601 in this embodiment; the four support leg slots 61 are respectively matched with the four mounting holes 601, and the support leg slots 61 and the mounting holes 601 can be adjusted and fixed by eight screws 7. Thus, the left tank 40 and the right tank 50 of the middle tank 20 can be adjusted in position by means of the support leg 6, so that the position of the support layer 204 of the middle layer 202 can be adjusted and changed.

[0053] The mounting plate 60 is also provided with fixing slots 602 on both sides for installing and locking the sewing fixture 100 onto the sewing machine.

[0054] See Figure 7 Since the C-shaped guide groove 1 of the middle groove body 20 is larger at the rear end and smaller at the front end, the middle groove body 20 is conical in shape, so that the upper groove body 10 is inclined and set above the middle groove body 20. The input ports of the corresponding sewing fixture 100 input end 102 can be set at intervals to facilitate the input of various materials.

[0055] like Figure 4 As shown, the upper tank 10 and the lower tank 30 have the same structure, both being long strip-shaped tank structures. At the same time, the top surface of both the upper tank 10 and the lower tank 30 is provided with an opening structure 8, which connects the internal channels 9 of the upper tank 10 and the lower tank 30. This opening structure 8 can be used to assist in pushing materials and prevent soft PU materials from clogging the internal channels 9.

[0056] In summary, the present invention provides a sewing fixture 100 for multi-layer bag straps that can replace the existing manual glue application process, achieving precise automatic alignment and arrangement. This allows the layers of the three-layer structure 200 to be continuously fed to the sewing machine needles for stitching, effectively improving production efficiency and significantly reducing glue usage. While reducing costs, it also minimizes the hazards of glue use, reduces manual labor intensity, and improves the working environment for workers. The upper groove 10, middle groove 20, and lower groove 30 ensure the accuracy of the overlapping positions of the layers, thereby improving the quality of the multi-layer bag straps produced, preventing stitching distortion, and greatly increasing the product yield.

[0057] Of course, the sewing fixture of the present invention is not limited to sewing PU materials, webbing and glue. Replacing each material with other materials can also achieve the purpose of saving glue and improving production efficiency.

[0058] The above description is merely a preferred embodiment of the present invention, and the scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, equivalent changes and modifications without departing from the principle of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A sewing jig for multi-layer bag straps, characterized in that: It includes an upper tank, a middle tank, and a lower tank arranged sequentially from top to bottom; The front ends of the upper and lower tanks are both output ports, and the rear ends are both input ports. The output ports of the upper and lower tanks are centered and aligned. The front end of the middle tank is also an output port, and the rear end is an input port. The output ports of the upper tank, middle tank and lower tank are arranged in close succession. The middle tank includes a left tank and a right tank arranged symmetrically on the left and right sides, and the left tank and the right tank are aligned with the two sides of the upper tank and the lower tank at equal distances on the left and right, respectively. Both the left and right grooves include C-shaped guide grooves; the C-shaped openings of the two C-shaped guide grooves are arranged opposite each other, the width of the C-shaped opening of each C-shaped guide groove gradually decreases from back to front, and each C-shaped guide groove is provided with a C-shaped channel that runs through the front and back, the width of the C-shaped channel also gradually decreases from back to front. The width of the rear opening of the C-shaped opening is greater than the width of the front opening. A limiting block is provided at the front opening of the C-shaped opening, and a front guide hole is formed between the limiting block and the C-shaped opening. A limiting ring is provided at the rear opening of the C-shaped opening, and a rear guide hole is formed between the limiting ring and the C-shaped opening. The front end of the sewing fixture has output ports forming an output end, and the output end is provided with two baffles; the two baffles are arranged on the left and right, the height of the baffles is greater than the thickness of the three-layer structure, and the baffles extend forward from the output end.

2. The sewing fixture for multi-layer bag straps according to claim 1, characterized in that: The C-shaped guide groove includes an outer wall and an inner wall, and the inner wall and the outer wall form the C-shaped channel; the width of the rear entrance of the C-shaped channel is greater than the width of the front exit of the C-shaped channel.

3. The sewing jig for multi-layer bag straps according to claim 1, characterized in that: The two baffles are respectively connected to the left and right sides of the output port of the middle tank.

4. The sewing jig for multi-layer bag straps according to claim 1, characterized in that: The inlet of the middle tank is provided with two guides, which are respectively located on the outer side of the rear end of the two C-shaped guide grooves of the middle tank.

5. The sewing jig for multi-layer bag straps according to claim 1, characterized in that: The sewing fixture also includes a mounting plate, which is connected and disposed below the lower groove body; the middle groove body and the upper groove body are detachably connected to the mounting plate by multiple support legs; the mounting plate is also provided with a fixed long groove for mounting and locking the sewing fixture onto the sewing machine.

6. The sewing fixture for multi-layer bag straps according to claim 4, characterized in that: The left and right sections of the middle tank are each connected to a support leg. One end of each support leg is connected to the middle tank, and the other end is provided with a support leg slot. The support leg slots are respectively fitted onto the mounting plate.

7. The sewing jig for multi-layer bag straps according to claim 1, characterized in that: The input ports at the rear end of the sewing fixture are spaced apart from each other; the top surfaces of the upper and lower grooves are provided with opening structures that connect the internal channels of the upper and lower grooves.

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