Edge covering folder and sewing device

Abstract

The invention discloses a hemming folder and a sewing device, and relates to the technical field of sewing, the hemming folder comprises a folder body and an air pipe assembly, the folder body is provided with a hemming channel for hemming cloth to pass through, and the hemming channel comprises a main body part, a first hemming part and a second hemming part; the second hemming part is used for being arranged at the position closer to a feed dog of the sewing device than the first hemming part. The air pipe assembly is used for being connected with an air source device, the air source device supplies air into the edge covering channel through the air pipe assembly, the air pipe assembly is provided with a first air outlet and a second air outlet, the first air outlet and the second air outlet are both communicated with the main body part, and airflow supplied by the air source device is blown out through the first air outlet and the second air outlet. And airflow blown out of the first air outlet and the second air outlet is used for blowing the edge covering cloth to the discharging opening of the edge covering channel, so that automatic pushing and moving of the edge covering cloth are achieved, the pushing speed can be guaranteed to be stable, and a seam allowance formed by the edge covering cloth is moderate in tightness.

Description

Technical Field

[0001] The present application relates to the field of sewing technology, and more specifically, to an edge pull tube and a sewing device. Background Art

[0002] In the prior art, when manually operating a sewing device to perform hemming operations, the operator's instability in pushing the hemming cloth often causes the stitches to be too tight or too loose, resulting in unevenness and waving at the hemming.

[0003] Therefore, how to improve the flatness of the hemming has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] In view of this, the purpose of the present application is to provide a edging pull tube to improve the flatness of the edging.

[0005] Another object of the present application is to provide a sewing device including the above-mentioned edge pulling cylinder.

[0006] A hemming pull tube, comprising:

[0007] The pull cylinder body is provided with a hemming channel, the hemming channel including a main body, a first hemming portion and a second hemming portion, the first hemming portion and the second hemming portion being respectively arranged on both sides of the main body, the hemming channel being used for allowing the hemming cloth to pass through, and the first hemming portion and the second hemming portion being used to curl the edge position of the hemming cloth, and the second hemming portion being used to be arranged at a position closer to the feed dog of the sewing device than the first hemming portion;

[0008] An air pipe assembly, the air pipe assembly is used to be connected to an air source device, and the air pipe assembly is provided with a first air outlet and a second air outlet, the first air outlet and the second air outlet are both connected to the main body, and the first air outlet and the second air outlet are both used to blow the edging cloth to the discharge port of the edging channel, the cross-sectional area of ​​the first air outlet is larger than the cross-sectional area of ​​the second air outlet, and the first air outlet is arranged closer to the first curling portion than the second air outlet.

[0009] Optionally, in the above-mentioned edge pulling tube, the air pipe assembly includes a first air pipe, the pipe mouth of the first end of the first air pipe is separated by a partition to form the first air outlet and the second air outlet, and the second end of the first air pipe is used to connect to the air source device.

[0010] Optionally, in the above-mentioned edge pulling tube, the air pipe assembly includes a second air pipe and a third air pipe, one end of the second air pipe is connected to the air source device, and the other end of the second air pipe is provided with the first air outlet; one end of the third air pipe is connected to the air source device, and the other end of the third air pipe is provided with the second air outlet.

[0011] Optionally, in the above-mentioned edge wrapping pull tube, the second air pipe and the third air pipe are respectively connected to the air source device, or the second air pipe and the third air pipe are both connected to the air source device through a fourth air pipe.

[0012] Optionally, in the above-mentioned edge wrapping pull tube, there are at least two air pipe assemblies, and the multiple air pipe assemblies are arranged at intervals along the extension direction of the edge wrapping channel, and each air pipe assembly is connected to the same air source device.

[0013] Optionally, in the above-mentioned edge-wrapping pull cylinder, the edge-wrapping pull cylinder further includes a control valve, which is arranged on the air pipe assembly and is used to adjust the air pressure in the air pipe assembly.

[0014] Optionally, in the above-mentioned edge wrapping pull tube, the edge wrapping pull tube further includes a pressure gauge, which is arranged on the air pipe assembly and is used to display the size of the air pressure in the air pipe assembly.

[0015] Optionally, in the above-mentioned edge-wrapping pull cylinder, the control valve is controlled to open or close by a foot pedal.

[0016] A sewing device comprising:

[0017] A machine body, on which a feed dog and a fabric presser foot are arranged opposite to each other;

[0018] The above-mentioned hemming pull cylinder is connected to the machine body, and the second curling portion is arranged at a position closer to the feed dog than the first curling portion.

[0019] Optionally, in the above-mentioned sewing device, a needle hole groove is provided on the cloth presser foot, and a stop edge is provided on one side of the needle hole groove.

[0020] The hemming pull cylinder provided in the present application includes a pull cylinder body and an air tube assembly. The pull cylinder body is provided with an hemming channel for allowing the hemming cloth to pass through. The hemming channel has an inlet and an outlet. The hemming cloth enters the hemming channel from the inlet and is discharged from the outlet. The hemming channel includes a main body, a first curling part and a second curling part, wherein the first curling part and the second curling part are respectively arranged on both sides of the main body, the main body is used for allowing the middle part of the hemming cloth to pass through, the first curling part and the second curling part are used for allowing the edge position of the hemming cloth to pass through and curling, thereby realizing the curling of the hemming cloth, wherein the second curling part is used to be arranged at a position closer to the feed dog of the sewing device than the first curling part. The air pipe assembly is used to connect to an air source device, which supplies air into the hemming channel through the air pipe assembly. The air pipe assembly is provided with a first air outlet and a second air outlet, both of which are connected to the main body. The airflow supplied by the air source device is blown out through the first air outlet and the second air outlet, and the airflow blown out from the first air outlet and the second air outlet is used to blow the hemming cloth toward the discharge port of the hemming channel, thereby achieving automatic pushing and moving of the hemming cloth, and the pushing speed can be guaranteed to be stable. Furthermore, the cross-sectional area of ​​the first air outlet is larger than the cross-sectional area of ​​the second air outlet, and the first air outlet is arranged closer to the first curling portion than the second air outlet, so that the hemming cloth at the first curling portion moves faster than the hemming cloth at the second curling portion, thereby balancing the speed difference between different hemming cloth positions formed by the feed dog pulling the hemming cloth relative to the fabric presser foot, thereby making the hemming cloth formed after hemming smooth and free of waves.

[0021] Compared with the prior art, the present application blows air into the hemming channel through the setting of the air pipe assembly, thereby realizing automatic pushing of the hemming cloth, ensuring the stability of the pushing speed of the hemming cloth, and making the tightness of the stop moderate; further, the hemming pull cylinder disclosed in the embodiment of the present application uses the first air outlet and the second air outlet with different cross-sectional areas to make the hemming cloth at different positions in the hemming channel have different moving speeds, and make the hemming cloth located at the first curling part have a faster moving speed than the hemming cloth located at the second curling part, thereby adapting to the speed difference of the hemming cloth at the feed dog and the fabric presser foot, so that the stop formed by the hemming cloth can be smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a schematic structural diagram of the first edge-wrapped pull tube disclosed in an embodiment of the present application;

[0024] Figure 2 This is a schematic diagram of the first structure of the first trachea disclosed in the embodiment of the present application;

[0025] Figure 3 This is a schematic diagram of the second structure of the first trachea disclosed in the embodiment of this application;

[0026] Figure 4 This is a schematic structural diagram of the second edge-wrapped pull tube disclosed in an embodiment of the present application;

[0027] Figure 5 This is a schematic diagram of the installation of the control valve and pressure gauge disclosed in the embodiment of the present application on the air pipe assembly;

[0028] Figure 6 This is a schematic structural diagram of a sewing device disclosed in an embodiment of the present application;

[0029] Figure 7 This is a schematic diagram of the structure of the cloth presser foot disclosed in the embodiment of this application Figure 1 ;

[0030] Figure 8 This is a schematic diagram of the structure of the cloth presser foot disclosed in the embodiment of this application Figure 2 .

[0031] Among them, 100 is the pull tube body, 101 is the main body, 102 is the first curling part, 103 is the second curling part, and 104 is the discharge port;

[0032] 200 is an air pipe assembly, 201 is a first air outlet, 202 is a second air outlet, 210 is a first air pipe, 211 is a partition, 220 is a second air pipe, 230 is a third air pipe, and 240 is a fifth air pipe;

[0033] 300 is a control valve, 310 is a pressure gauge;

[0034] 400 is the fabric presser foot, 401 is the needle hole slot, 402 is the presser foot plate, 403 is the adjustment screw, 404 is the presser foot rod, 405 is the stop edge, and 406 is the transition slope;

[0035] 500 is the body. DETAILED DESCRIPTION

[0036] The core of this application is to disclose an edge-wrapping pull tube to improve the flatness of the edge.

[0037] Another core of the present application is to disclose a sewing device including the above-mentioned hemming pull cylinder.

[0038] The following embodiments are described with reference to the accompanying drawings. The embodiments shown below do not limit the inventions described in the claims. Furthermore, the entire contents of the configurations shown in the following embodiments are not limited to those necessary for the solutions to the inventions described in the claims. It should be noted that, for ease of description, only the portions relevant to the inventions are shown in the accompanying drawings. The embodiments and features in the embodiments of this application may be combined with each other unless there is a conflict.

[0039] In sewing devices, a feed dog is typically positioned opposite the fabric presser foot, and manual pushing is relied upon to assist in the movement of the hemming strip and other fabric materials. However, the unstable manual pushing speed often leads to uneven tightness in the hemming seams. Furthermore, the structural differences between the toothed surface of the feed dog and the flat surface of the fabric presser foot cause the hemming strip to move at different speeds on both sides where it contacts the feed dog and fabric presser foot, which can easily lead to distortion and, consequently, uneven hemming. Based on this, the present application discloses the following hemming puller and sewing device.

[0040] Combine Figures 1-8 The edge pull cylinder disclosed in the embodiment of the present application includes a pull cylinder body 100 and an air pipe assembly 200. The pull cylinder body 100 is provided with an edge channel for allowing the edge cloth to pass through. The edge channel has an inlet and an outlet 104. The edge cloth enters the edge channel from the inlet and is discharged from the outlet 104. The edge channel includes a main body 101, a first curling part 102 and a second curling part 103, wherein the first curling part 102 and the second curling part 103 are respectively arranged on both sides of the main body 101, the main body 101 is used for allowing the middle part of the edge cloth to pass through, the first curling part 102 and the second curling part 103 are used for allowing the edge position of the edge cloth to pass through and curl, thereby realizing the curling of the edge cloth, wherein the second curling part 103 is used to be arranged at a position closer to the feed dog of the sewing device than the first curling part 102; the specific structure and curling principle of the pull cylinder body 100 are both existing technologies, and the embodiments of the present application will not be repeated.

[0041] The air pipe assembly 200 is used to be connected to the air source device, and the air source device supplies air to the hemming channel through the air pipe assembly 200, and the air pipe assembly 200 is provided with a first air outlet 201 and a second air outlet 202, and the first air outlet 201 and the second air outlet 202 are both connected to the main body 101, and the airflow supplied by the air source device is blown out by the first air outlet 201 and the second air outlet 202, and the airflow blown out by the first air outlet 201 and the second air outlet 202 is used to blow the hemming cloth to the discharge port 104 of the hemming channel, thereby realizing the automatic pushing and moving of the hemming cloth, and the pushing speed can be guaranteed to be stable. Furthermore, the cross-sectional area of ​​the first air outlet 201 is greater than that of the second air outlet 202. At the same time, the first air outlet 201 is arranged at a position closer to the first curling portion 102 than the second air outlet 202, so that the edging cloth at the first curling portion 102 moves faster than the edging cloth at the second curling portion 103, so as to balance the speed difference of different edging cloth positions formed by the feed dog pulling the edging cloth relative to the fabric presser foot 400, so that the stop formed after the edging cloth is wrapped is smooth and has no waves.

[0042] It should be noted that the first air outlet 201 and the second air outlet 202 discharge air synchronously to ensure that the hemming cloth is pushed continuously and stably.

[0043] Compared with the prior art, the present application blows air into the hemming channel through the setting of the air pipe assembly 200, thereby realizing automatic pushing of the hemming cloth, ensuring the stability of the pushing speed of the hemming cloth, and making the tightness of the stop moderate; further, the hemming pull cylinder disclosed in the embodiment of the present application uses the first air outlet 201 and the second air outlet 202 with different cross-sectional areas to make the hemming cloth at different positions in the hemming channel have different moving speeds, and make the hemming cloth located at the first curling part 102 have a faster moving speed than the hemming cloth located at the second curling part 103, thereby adapting to the speed difference of the hemming cloth at the feed dog and the fabric presser foot 400, so that the stop formed by the hemming cloth can be smoother.

[0044] For example, the hemming pull tube disclosed in the embodiment of the present application can be used for hemming the zipper, making the lines of the zipper more neat and solving the problem of waving caused by the unevenness of the zipper.

[0045] Specifically, in some embodiments, combined with Figure 1 and Figure 2The air pipe assembly 200 includes a first air pipe 210. The first end of the first air pipe 210 can be separated by a partition 211 to form the first air outlet 201 and the second air outlet 202. The second end of the first air pipe 210 is used to connect to the air source device. The first air pipe 210 can be connected to the pull tube body 100 by welding and can be installed on the main body 101 at a distance of 3 cm from the discharge port 104 or at other locations.

[0046] Further, combined with Figure 3 The partition 211 can be arranged at an angle to the two side surfaces corresponding to the first air outlet 201 and the second air outlet 202, so that the airflow blown out from the first air outlet 201 and the second air outlet 202 can flow away from each other, thereby pushing the two sides of the edging cloth respectively.

[0047] In order to facilitate the pushing of the edge cloth, combined with Figure 2 and Figure 3 The pipe opening at the first end of the first air pipe 210 can be set as an oblique section inclined toward the discharge port 104 of the edging channel to ensure that the airflow blown out from the first air outlet 201 and the second air outlet 202 can push the edging cloth toward the discharge port 104 without manual advancement, thereby avoiding uneven tightness of the stop.

[0048] Specifically, there is at least one first air pipe 210 . When there are multiple first air pipes 210 , the multiple first air pipes 210 are arranged at intervals along the extension direction of the main body 101 , and the multiple first air pipes 210 can ensure reliable transportation of materials.

[0049] In other embodiments disclosed in this application, Figure 4 The air pipe assembly 200 includes a second air pipe 220 and a third air pipe 230. One end of the second air pipe 220 is connected to the air source device, and the other end of the second air pipe 220 is provided with the above-mentioned first air outlet 201; one end of the third air pipe 230 is connected to the air source device, and the other end of the third air pipe 230 is provided with the above-mentioned second air outlet 202, so as to blow air into the edge channel through the second air pipe 220 and the third air pipe 230 respectively. In this embodiment, the installation positions of the second air pipe 220 and the third air pipe 230 on the main body 101 can be directly adjusted, so that the first air outlet 201 and the second air outlet 202 are respectively set at positions close to the first curling portion 102 and the second curling portion 103, thereby realizing differential conveying of the two side portions of the edge cloth.

[0050] The second air pipe 220 and the third air pipe 230 can directly select air pipe structures with different cross-sectional areas. The second air pipe 220 and the third air pipe 230 can be connected to the air source device separately, or both the second air pipe 220 and the third air pipe 230 can be connected to the air source device through a fourth air pipe to reduce costs and facilitate synchronous blowing of the second air pipe 220 and the third air pipe 230. The first air outlet 201 and the second air outlet 202 can be arranged side by side along the extension direction of the hemming channel.

[0051] Further, combined with Figure 1 The air pipe assembly 200 also includes at least one fifth air pipe 240, the air inlet of the fifth air pipe 240 is connected to the air source device, and the air outlet of the fifth air pipe 240 is defined as the third air outlet, then the third air outlet is connected to the edge channel and is used to blow the edge cloth, and the third air outlet is arranged in the middle position of the first curling portion 102 and the second curling portion 103 to ensure the synchronous blowing effect on different parts of the edge cloth, and along the extension direction of the edge channel, the third air outlet is spaced apart from the first air outlet 201 and the second air outlet 202, and can be arranged on the side of the first air outlet 201 and the second air outlet 202 that is closer to or farther away from the discharge port 104.

[0052] There are at least two air pipe assemblies 200, and the multiple air pipe assemblies 200 are arranged at intervals along the extending direction of the edge-wrapping channel, and each air pipe assembly 200 is connected to the same air source device.

[0053] Further, combined with Figure 5 The hemming puller also includes a control valve 300, which is mounted on the air pipe assembly 200 and is used to adjust the air pressure within the air pipe assembly 200, thereby controlling the movement speed of the hemming fabric. For example, the control valve 300 can be an air compressor, and the air flow rate is adjusted by rotating a control knob on the air compressor. The knob has a pattern, text, or other marking indicating the direction of air pressure adjustment.

[0054] To facilitate operator control of the air flow from the air pipe assembly 200, the hemming puller may also include a foot pedal. This allows the operator to control the air flow from the air pipe assembly 200 by stepping on the pedal. This convenient operation allows for the airflow of the hemming fabric when needed. Specifically, the foot pedal can directly control the opening and closing of the control valve 300, or an on / off valve can be provided on the air pipe assembly 200, which in turn controls the air flow from the air pipe assembly 200. The on / off control mechanism of the foot pedal and the valve body is conventional and will not be further described here.

[0055] Furthermore, the hemming puller also includes an air pressure gauge 310, which is installed on the air pipe assembly 200 and is used to display the air pressure within the air pipe assembly 200, thereby facilitating the operator to adjust the moving speed of the hemming cloth by operating the control valve 300. In addition, the air pressure can be adjusted according to the thickness of the hemming cloth, so that hemming strips of different thicknesses can be transported stably.

[0056] Combine Figure 6 The sewing device disclosed in the embodiment of the present application includes a body 500 and the above-mentioned hemming pull cylinder. The body 500 is provided with a feed dog and a fabric presser foot 400 arranged relatively to each other. The hemming cloth is used to pass between the feed dog and the fabric presser foot 400. The feed dog is used to ensure that the hemming cloth can move evenly during the sewing process, thereby achieving continuous sewing. The fabric presser foot 400 can prevent the hemming cloth from moving or sliding during the sewing process by applying appropriate pressure, thereby avoiding skipping or breaking of the thread. The hemming pull cylinder is provided on the body 500, and the second hemming portion 103 is arranged at a position closer to the feed dog than the first hemming portion 102. Since the sewing device disclosed in the present application includes the above-mentioned hemming pull cylinder, it also has the above-mentioned structure and beneficial effects. The feed dog, the fabric presser foot 400 and other structures of the sewing device can refer to the existing technology and will not be described in detail here. For example, the sewing device can be a stretch sewing machine or other sewing device.

[0057] Furthermore, in some embodiments disclosed in this application, Figure 7 and Figure 8 The fabric presser foot 400 is provided with a needle hole slot 401 for the needle to pass through, and a stop rib 405 is provided on one side edge of the needle hole slot 401. The stop rib 405 can stop and limit the hemming fabrics of different thicknesses, thereby preventing the hemming fabrics from shifting and causing the hemming fabrics to have different widths, ensuring that the hemming strips are of equal width and smooth cutting lines. The stop rib 405 and the fabric presser foot 400 can be connected by welding, or the stop rib 405 and the fabric presser foot 400 can be an integrally formed structure.

[0058] The installation position and installation angle of the fabric presser foot 400 on the machine body 500 can be adjusted according to the different thicknesses of the hemming cloth. Specifically, a presser foot rod 404 is provided on the machine body, and the fabric presser foot 400 is connected to the presser foot rod 404 by adjusting the screw 403. The installation angle of the fabric presser foot 400 can be adjusted by adjusting the screw 403, thereby ensuring smooth feeding of the hemming cloth.

[0059] In some embodiments, the needle hole groove 401 and the fabric presser foot 400 are used to press the end surface of one side of the hemming cloth through a transition slope 406, thereby facilitating the movement of the hemming cloth relative to the fabric presser foot 400, so that the sewing device can still maintain stable cloth feeding when encountering a joint.

[0060] In addition, a presser foot 402 is set on the side of the fabric presser foot 400 for pressing the edging cloth. The presser foot 402 is used to fix the edging cloth and assist in feeding the cloth. The presser foot 402 is arranged to avoid the position of the needle hole slot 401 to avoid the problem that thicker starting materials cannot be placed in the fabric presser foot 400.

[0061] The hemming pull cylinder generally includes a mounting plate connected to the pull cylinder body 100, and the hemming pull cylinder is connected to the machine body 500 via the mounting plate. A strip groove is provided on the mounting plate, and the hemming pull cylinder can be adjusted relative to the machine body 500 through the strip groove. The sewing device disclosed in the embodiment of the present application is simple to operate, easy to use, low in cost, and has better sewing effects and smoother finished garments.

[0062] The terms "first" and "second" and the like in the specification and claims of this application are used to distinguish different objects, rather than to describe a specific order, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not set to the listed steps or units, but may include steps or units that are not listed. In addition, in the description of the embodiments of the present application, "multiple" refers to two or more than two.

[0063] The above description of the disclosed embodiments enables professionals and technicians in this field to implement or use the present application. Various modifications to these embodiments will be obvious to professionals and technicians in this field, and the general principles defined in this article can be implemented in other embodiments without departing from the spirit or scope of this application. The specific technical means in some embodiments may be incorporated into another embodiment in part or in whole, unless expressly excluded by another embodiment. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hemming pull tube, characterized in that: include: The pull-tube body (100) is provided with an edge-binding channel, wherein the edge-binding channel comprises a main body (101), a first curling portion (102) and a second curling portion (103), wherein the first curling portion (102) and the second curling portion (103) are respectively arranged on both sides of the main body (101), the edge-binding channel is used for allowing the edge-binding cloth to pass through, and the first curling portion (102) and the second curling portion (103) are used for curling the edge position of the edge-binding cloth, and the second curling portion (103) is used for being arranged at a position closer to the feed dog of the sewing device than the first curling portion (102); An air pipe assembly (200) is provided, wherein the air pipe assembly (200) is used to be connected to an air source device, and the air pipe assembly (200) is provided with a first air outlet (201) and a second air outlet (202), the first air outlet (201) and the second air outlet (202) are both communicated with the main body (101), and the first air outlet (201) and the second air outlet (202) are both used to blow the hemming cloth toward the discharge port (104) of the hemming channel, the cross-sectional area of ​​the first air outlet (201) is larger than the cross-sectional area of ​​the second air outlet (202), and the first air outlet (201) is arranged closer to the first curling portion (102) than the second air outlet (202).

2. The edge wrapping tube according to claim 1, characterized in that: The air pipe assembly (200) comprises a first air pipe (210), wherein the pipe opening at the first end of the first air pipe (210) is separated by a partition (211) to form the first air outlet (201) and the second air outlet (202), and the second end of the first air pipe (210) is used for connecting to the air source device.

3. The edge wrapping tube according to claim 1, characterized in that: The air pipe assembly (200) comprises a second air pipe (220) and a third air pipe (230); one end of the second air pipe (220) is connected to the air source device, and the other end of the second air pipe (220) is provided with the first air outlet (201); one end of the third air pipe (230) is connected to the air source device, and the other end of the third air pipe (230) is provided with the second air outlet (202).

4. The edge wrapping tube according to claim 3, characterized in that: The second air pipe (220) and the third air pipe (230) are respectively connected to the air source device, or the second air pipe (220) and the third air pipe (230) are both connected to the air source device via a fourth air pipe.

5. The edge wrapping tube according to claim 1, characterized in that: There are at least two air pipe assemblies (200), and the plurality of air pipe assemblies (200) are arranged at intervals along the extension direction of the edge-wrapping channel, and each air pipe assembly (200) is connected to the same air source device.

6. The edge wrapping tube according to any one of claims 1 to 5, characterized in that: The hemming pull tube further comprises a control valve (300), which is arranged on the air pipe assembly (200) and is used to adjust the air pressure in the air pipe assembly (200).

7. The edge wrapping tube according to claim 6, characterized in that: The hemming pull tube further comprises an air pressure gauge (310), which is arranged on the air pipe assembly (200) and is used to display the size of the air pressure in the air pipe assembly (200).

8. The edge wrapping tube according to claim 6, characterized in that: The control valve (300) is switched on and off by a foot pedal.

9. A sewing device, characterized in that: include: A machine body (500), wherein the machine body (500) is provided with a feed dog and a cloth presser foot (400) arranged opposite to each other; The hemming pull cylinder according to any one of claims 1 to 8, wherein the hemming pull cylinder is connected to the machine body (500), and the second curling portion (103) is arranged at a position closer to the feed dog than the first curling portion (102).

10. The sewing device according to claim 9, characterized in that The cloth presser foot (400) is provided with a needle hole slot (401), and a stop edge (405) is provided on one side of the needle hole slot (401).

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