Tubular and overlock machine

Abstract

The application discloses a pull cylinder and an overlock machine. The pull cylinder is connected to a bending structure and a fixing structure through a distance adjusting structure. The bending structure comprises a bending main body with a hemming channel and a slider arranged in the hemming channel. The hemming channel has a first opening, a second opening and a third opening. The first opening is directed to a positioning component of the distance adjusting structure. The second opening and the third opening are used for passing a cutting piece. The slider can move along the direction towards or away from the first opening relative to the hemming channel, so as to adjust the distance between the slider and the positioning component. The pull cylinder and the overlock machine can control the distance between the cutting piece and a cutter, adjust the width and position of the bending of the cutting piece, and ensure the smooth and stable path of the overlock stitch, thereby improving the quality of the overlock product, improving the material utilization rate and saving the labor cost.

Description

Technical Field

[0001] This invention relates to the field of sewing auxiliary tools, and more particularly to a puller and overlock sewing machine. Background Technology

[0002] Overlock stitch refers to a chain stitch formed by one or more threads looping together along the edge of a garment piece. As a type of overlock stitch, scar stitch is commonly used on the hems and cuffs of knitted garments, serving both to cover raw edges and to decorate the edges of the garment pieces. Specifically, in the process of making scar stitch, the garment piece is often folded along the edge and then folded in the opposite direction to form a double-folded, three-layered garment structure. The three layers of garment are then passed through an overlock sewing machine along the folded edges, and the folded portion is unfolded to form a stitch with multiple line segments spaced apart. This type of stitch is called scar stitch.

[0003] In related technologies, the production of scar needles is mostly controlled manually by the operator. The scar needle stitches are prone to being crooked and uneven. When passing through the overlock sewing machine, the cut piece is easily cut by the cutter, resulting in damage and affecting the quality of the finished product, thus causing waste of materials and labor. Summary of the Invention

[0004] This invention discloses a pull tube and overlock sewing machine, which can control the distance between the cut piece and the cutter, adjust the width and position of the cut piece bending, and ensure that the path of the overlock stitch is flat and stable, thereby improving the quality of the overlocked product, while increasing material utilization and saving labor costs.

[0005] To achieve the above objectives, in a first aspect, the present invention discloses a pull tube, comprising:

[0006] A fixing structure having opposing first and second ends, the first end being used to fix to an overlock sewing machine;

[0007] Adjustable distance structure, the adjustable distance structure being connected to the second end, the adjustable distance structure being provided with a positioning component; and

[0008] A bending structure includes a bending body and a slider. The bending body is connected to the adjusting structure. The bending body has a curling channel with a first opening, a second opening, and a third opening. The first opening faces the positioning component of the adjusting structure. The second and third openings are opposite to each other and are used for passing through the cut piece. The slider is slidably disposed in the curling channel and can move relative to the curling channel in a direction toward or away from the first opening to adjust the distance between the slider and the positioning component.

[0009] As an optional implementation, in an embodiment of the first aspect of the present invention, the bending body is provided with a first groove communicating with the edge-rolling channel, the first groove extending along the length direction of the edge-rolling channel, the slider is provided with a first connecting hole communicating with the first groove, and the pull cylinder further includes a first fastener, the first fastener passing through the first groove and the first connecting hole, so as to connect the slider with the bending body.

[0010] As an optional implementation, in an embodiment of the first aspect of the present invention, the bending structure further includes a first adjusting member, which is disposed in the edge-rolling channel along the height direction of the edge-rolling channel. The first adjusting member is provided with a second sliding groove, which communicates with the edge-rolling channel and extends along the length direction of the edge-rolling channel. The slider is slidably connected to the second sliding groove.

[0011] As an optional implementation, in an embodiment of the first aspect of the present invention, the first adjusting member is movably disposed relative to the bending body along the height direction of the crimping channel.

[0012] As an optional implementation, in an embodiment of the first aspect of the present invention, the pull tube further includes a first connector, the first connector being located on the bending body and the adjusting structure, and the first connector being connected to the bending body and the adjusting structure.

[0013] As an optional implementation, in an embodiment of the first aspect of the present invention, the first connector includes a first connecting portion and a second connecting portion. The first connecting portion is rotatably connected to the second connecting portion and is connected to the bending body. The second connecting portion is connected to the adjusting structure. The first connecting portion can rotate relative to the second connecting portion to drive the bending body to rotate relative to the second connecting portion and rest against the second connecting portion. Alternatively, the adjusting structure is provided with a first baffle, and the bending body can rotate relative to the adjusting structure to rest against the first baffle.

[0014] As an optional implementation, in an embodiment of the first aspect of the present invention, the adjusting structure includes a pressure block and a second connecting member. The pressure block is provided with the positioning component, one end of the second connecting member is connected to the side of the pressure block away from the positioning component, and the other end of the second connecting member is connected to the fixing structure.

[0015] As an optional implementation, in an embodiment of the first aspect of the present invention, the pressure block is provided with a mounting groove with an opening facing the second connector, the second connector includes a first mounting portion and a first fixing portion connected to the first mounting portion, the first mounting portion at least partially extending into the mounting groove and connected to the mounting groove, and the first fixing portion connected to the fixing structure.

[0016] As an optional implementation, in an embodiment of the first aspect of the present invention, the first mounting part is movably connected to the mounting groove, and the adjusting structure further includes a second adjusting member connected to the pressure block and the first mounting part to adjust the position of the first mounting part extending into the mounting groove.

[0017] As an optional implementation, in an embodiment of the first aspect of the present invention, the bottom surface of the first mounting part is provided with a protrusion, the protrusion is provided with a second connecting hole, the adjusting structure further includes a mounting component, the mounting component is connected to the side of the pressure block opposite to the positioning component, the mounting component is provided with a third connecting hole communicating with the second connecting hole, and the second adjusting member is movably connected to the third connecting hole and the second connecting hole.

[0018] As an optional implementation, in an embodiment of the first aspect of the present invention, the second connector further includes a transition portion that extends upward from the side of the first mounting portion away from the pressure block to connect with the first fixing portion, such that the distance from the plane of the first fixing portion to the bottom surface of the pressure block is greater than the distance from the plane of the first mounting portion to the bottom surface of the pressure block.

[0019] As an optional implementation, in an embodiment of the first aspect of the present invention, the fixing structure includes a third connector and a fourth connector connected to the third connector, the third connector being connected to the adjusting structure, and the fourth connector being used to connect to the overlock sewing machine.

[0020] As an optional implementation, in an embodiment of the first aspect of the present invention, the fourth connector is rotatably connected to the third connector so as to rotate relative to the third connector to overlap the third connector, or the fourth connector is slidably connected to the third connector.

[0021] As an optional implementation, in an embodiment of the first aspect of the present invention, when the fourth connector is rotatably connected to the third connector, the third connector is provided with a limiting member, which is used to connect with the fourth connector to limit the state and position of the fourth connector being stacked on the third connector.

[0022] As an optional implementation, in an embodiment of the first aspect of the present invention, the fixing structure further includes an elastic member, one end of which is connected to the third connector and the other end of which is connected to the limiting member, the elastic member being used to make the limiting member movable relative to the third connector.

[0023] In a second aspect, the present invention discloses an overlock sewing machine, the overlock sewing machine comprising an overlock sewing machine body, a presser foot, and a pull cylinder as described in the first aspect above, wherein the fixing structure of the presser foot and the pull cylinder are respectively connected to the overlock sewing machine body.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The pull cylinder and overlock sewing machine provided in this invention have a pull cylinder connected to a bending structure and a fixing structure via an adjustable distance structure. The bending structure includes a bending body with a hemming channel and a slider disposed in the hemming channel. The hemming channel has a first opening, a second opening, and a third opening. The first opening faces the positioning component of the adjustable distance structure, while the second and third openings allow the cut piece to pass through. The slider can move relative to the hemming channel in a direction toward or away from the first opening to adjust the distance between the slider and the positioning component. Thus, when sewing with the pull cylinder of this invention, a cut piece that has been double-folded can be placed between the bending body and the positioning component through the first opening. The double-folded cut piece is located inside the hemming channel, while the main body portion of the cut piece extending away from the bending portion is located outside the bending body. At this time, the folded edge of the double-folded cut piece abuts against the slider, and the edge of the double-folded cut piece and the bending portion of the cut piece abut against the positioning component. After the cut pieces pass through the pull tube and are sewn through the second and third openings, the cut pieces that exceed the positioning parts will be cut off by the sewing machine's cutter. At the same time, overlock stitches are formed on the edges of the three layers of cut pieces. By unfolding the double-layer cut pieces and the main body of the cut pieces along the bending parts, neatly arranged scar stitches can be obtained.

[0026] In other words, the pull tube of the present invention uses a positioning component to limit the position of the cut piece, thereby controlling the distance between the cut piece and the cutter, thus preventing the cutter from cutting the area where the suture needle would be and causing damage to the cut piece. Simultaneously, the movement of the cut piece is limited by the slider and the first opening to ensure that the path of the overlock stitch is even and stable. Furthermore, by adjusting the distance between the slider and the positioning component, the width of the cut piece's bend and the position of the suture needle can also be controlled. Therefore, the solution of the present invention can improve the quality of the finished product, increase material utilization, and save labor costs. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of the pull tube disclosed in the embodiments of this application;

[0029] Figure 2 for Figure 1 The diagram shows the structural schematic of the bending body in the pull tube;

[0030] Figure 3 for Figure 1 The diagram shown is a structural schematic of the first adjusting component in the pull tube;

[0031] Figure 4 for Figure 1 A schematic diagram of the structure of the first connector in the pull tube is shown;

[0032] Figure 5 (A) and (B) in the text are respectively Figure 1 The diagram and bottom view of the pressure block in the pull tube are shown;

[0033] Figure 6 for Figure 1 The diagram shows the structure of the second connector in the pull tube;

[0034] Figure 7 for Figure 1 The diagram shown is a structural schematic of the mounting components in the pull tube;

[0035] Figure 8 A schematic diagram of the fixing structure when the fourth connector is stacked on top of the third connector;

[0036] Figure 9 This is a schematic diagram of the overlock sewing machine disclosed in the embodiments of this application.

[0037] icon:

[0038] 100. Pull tube; 10. Bending structure; 11. Bending body; 110. Hemming channel; 111. First plate portion; 112. Bending portion; 113. Second plate portion; 113a. First slide groove; 114. Second fastener; 12. Slider; 121. First groove; 13. First fastener; 14. First adjusting component; 141. Second slide groove; 142. First adjusting hole; 143. Raised portion; 20. Adjustment structure; 21. Pressure block; 211. Positioning component; 212. Protrusion; 213. Mounting groove; 22. Second connecting component; 221. First mounting portion; 2211. Protrusion; 2211 a. Second connecting hole; 222. First fixing part; 2221. First baffle; 223. Transition part; 23. Second adjusting part; 24. Mounting part; 241. Third connecting hole; 25. Fourth fastener; 30. Fixing structure; 31. Third connecting part; 310. First bending part; 311. Restricting part; 33. Elastic part; 32. Fourth connecting part; 320. Second bending part; 321. Fixing hole; 322. Third groove; 40. First connecting part; 41. First connecting part; 42. Second connecting part; 421. Second groove; 101. Presser foot; 102. Overlock machine body; 200. Overlock machine. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation.

[0041] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0042] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0043] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0044] The technical solution of the present invention will be further described below with reference to the embodiments and accompanying drawings.

[0045] Please refer to the following: Figures 1 to 3 In a first aspect, the present invention provides a pull cylinder 100, which can be applied in an overlock sewing machine to control the position of the cutter relative to the cutter and the width and position of the bend in the cutter, so as to ensure that the cutter is intact and undamaged, and that the overlock stitch path is flat and stable. Specifically, the pull cylinder 100 includes a bending structure 10, an adjusting structure 20, and a fixing structure 30. The fixing structure 30 has a first end and a second end opposite to each other. The first end is used to fix it to the overlock sewing machine, and the second end is connected to the adjusting structure 20. The adjusting structure 20 is provided with a positioning component 211. The bending structure 10 includes a bending body 11 and a slider 12. The bending body 11 is connected to the adjusting structure 20, and the bending body 11 has a hemming channel 110. The hemming channel 110 has a first opening, a second opening, and a third opening. The first opening is disposed facing the positioning component 211 of the adjusting structure 20, and the second and third openings are disposed opposite to each other and are used for the cutter to pass through. The slider 12 is slidably disposed in the hemming channel 110. The slider 12 can move relative to the hemming channel 110 in a direction toward or away from the first opening to adjust the distance between the slider 12 and the positioning member 211.

[0046] The pull cylinder 100 provided in this embodiment is connected to the bending structure 10 and the fixing structure 30 by setting an adjustment structure 20. The bending structure 10 includes a bending body 11 with a hemming channel 110 and a slider 12 disposed in the hemming channel 110. The hemming channel 110 has a first opening, a second opening and a third opening. The first opening faces the positioning component 211 of the adjustment structure 20. The second opening and the third opening allow the cut piece to pass through. The slider 12 can move relative to the hemming channel 110 in a direction toward or away from the first opening. When sewing with an overlock sewing machine equipped with this pull cylinder 100, a cut piece that has been double-folded can be placed between the bending body 11 and the positioning component 211 through the first opening. The double-folded cut piece is located inside the hemming channel 110, and the main body portion of the cut piece extending in a direction away from the bending part is located outside the bending body 11. At this time, the folded edge of the double-folded cut piece abuts against the slider 12, and the edge of the double-folded cut piece and the bending part of the cut piece abut against the positioning component 211. After the cut piece passes through the pull tube 100 through the second and third openings and is sewn, the cut piece that exceeds the positioning part 211 will be cut off by the sewing machine's cutter. At the same time, overlock stitches are formed on the edges of the three-layer cut pieces. By unfolding the double-layer cut pieces and the main body of the cut piece along the bending part, neatly arranged scar stitches can be obtained.

[0047] As can be seen, the positioning component 211 can limit the position of the cut piece to control the distance between the cut piece and the cutter, thereby preventing the cutter from cutting the position of the piercing needle and causing damage to the cut piece. At the same time, the movement of the cut piece is limited by the slider 12 and the first opening to ensure that the path of the overlock stitch is even and stable. In addition, by adjusting the distance between the slider 12 and the positioning component 211, the width of the cut piece bend and the position of the piercing needle can also be controlled.

[0048] In some embodiments, the bending body 11 may be formed by bending a single metal sheet, on which the aforementioned hemming channel 110 is formed. Using a single metal sheet for forming facilitates the shaping of the bending body 11, while also reducing connection points and minimizing the possibility of the cut piece being scratched or snagged when passing through the hemming channel 110.

[0049] Specifically, the bending body 11 includes a first plate portion 111, a bending portion 112, and a second plate portion 113 connected in sequence, so that the first plate portion 111, the bending portion 112, and the second plate portion 113 are connected to form a rolled edge channel 110 having the aforementioned first opening, second opening, and third opening, and the third opening is disposed opposite to the bending portion 112.

[0050] In other embodiments, the bending body may also be formed by combining multiple metal plates. For example, the bending body may include a first plate component and a second plate component arranged opposite to and spaced apart from each other, and a third plate component connected to the first plate component and the second plate component, so that the first plate component, the second plate component, and the third plate component enclose a hemming channel having the aforementioned first opening, second opening, and third opening, wherein the third opening is arranged opposite to the third plate component. By adopting the configuration of the bending body including multiple metal plates, the size of the bending body can be designed according to the application scenario so that the bending body and the cut piece can fit better.

[0051] The following description will be based on the example that the bending body 11 is formed by bending a metal plate, that is, the bending body 11 includes a first plate portion 111, a bending portion 112 and a second plate portion 113.

[0052] In some embodiments, the bending body 11 is provided with a first groove 113a communicating with the edge-rolling channel 110. The first groove 113a extends along the length direction of the edge-rolling channel 110. The slider 12 is provided with a first connecting hole communicating with the first groove 113a. The pull cylinder 100 also includes a first fastener 13, which passes through the first groove 113a and the first connecting hole to connect the slider 12 with the bending body 11.

[0053] The design of the first groove 113a allows the first fastener 13 to move along the length of the crimping channel 110, thereby ensuring that the slider 12 can move within the crimping channel 110 in a direction toward or away from the first opening to adjust the distance between the slider 12 and the positioning component 211. On the other hand, by connecting the first fastener 13 through the first groove 113a to the first connecting hole, the slider 12 can be fixed to the bending body 11.

[0054] In this way, when using the pull tube 100, the bent piece can be placed between the first plate portion 111 and the second plate portion 113 through the first opening. The piece wraps around the end of the first plate portion 111 away from the bent portion 112 along the length direction of the hemming channel 110. At the same time, the edge of the piece located in the hemming channel 110 abuts against the slider 12. In this way, when the piece passes through the second opening and the third opening through the bending body 11, the bending position and width of the piece can be kept flat and stable.

[0055] For example, the first fastener 13 can be any of a screw, bolt, or stud to achieve a detachable connection between the first fastener 13 and the first connecting hole, which facilitates the adjustment of the position of the slider 12.

[0056] In some embodiments, the bending structure 10 further includes a first adjusting member 14, which is disposed between the first plate portion 111 and the second plate portion 113. The first adjusting member 14, together with the first plate portion 111 and the bending portion 112, forms a hemming channel 110 through which the cut piece can pass. The first adjusting member 14 is provided with a second sliding groove 141, which is connected to the hemming channel 110 and extends along the length direction of the hemming channel 110. The slider 12 is slidably connected to the second sliding groove 141.

[0057] By adding the first adjusting member 14, the height of the hemming channel 110 can be changed to accommodate fabric pieces of different thicknesses. The operator can selectively use or not use the first adjusting member 14 depending on the actual thickness of the fabric piece.

[0058] In some embodiments, the first adjusting member 14 is in the shape of a long strip, and the bending body 11 further includes a second fastener 114. A first adjusting hole 142 is provided at the end of the first adjusting member 14 away from the bending portion 112. The second fastener 114 passes through the second plate portion 113 and the first adjusting hole 142. Thus, not only can the first adjusting member 14 be connected to the bending body 11, but the edge-curling channel 110 can also be kept unobstructed.

[0059] Furthermore, the first adjusting member 14 has a raised portion 143 on the side near the bent portion 112. The raised portion 143 communicates with the second slide groove 141 and is raised along the height direction of the crimping channel 110. The slider 12 has a first groove 121 with an opening facing the second plate portion 113. The first groove 121 is used to place the raised portion 143 to position the first adjusting member 14, and the aforementioned first connecting hole is disposed in the first groove 121. When the first adjusting member 14 is disposed in the crimping channel 110, the raised portion 143 is disposed in the first groove 121, and the top of the raised portion 143 abuts against the second plate portion 113. That is, one end of the first adjusting member 14 is connected to the second plate portion 113 through the first adjusting hole 142 and the second fastener 114, and the other end of the first adjusting member 14 is fixed between the slider 12 and the second plate portion 113 through the raised portion 143. Thus, the addition of the raised portion 143 and the first groove 121 facilitates the fixing of the first adjusting member 14, and the addition of the first groove 121 also facilitates the opening of the first connecting hole.

[0060] Furthermore, by adjusting the length of the second fastener 114, the height of the first adjusting member 14 relative to the first plate portion 111 can be adjusted, thereby adjusting the height of the hemming channel 110 so that the bending structure 10 can adapt to fabric pieces of different thicknesses.

[0061] Optionally, the second fastener 114 may be any of a bolt, screw or stud to enable a detachable connection between the first adjusting member 14 and the bending body 11, while also facilitating height adjustment of the first adjusting member 14 within the crimping channel 110.

[0062] Please combine Figures 4 to 6 In some embodiments, the pull tube 100 further includes a first connector 40, which is located on the bending body 11 and the adjusting structure 20. The first connector 40 includes a first connecting portion 41 and a second connecting portion 42, with the first connecting portion 41 connected to the bending body 11 and the second connecting portion 42 connected to the adjusting structure 20. By using the first connector 40, the bending structure 10 and the adjusting structure 20 can be connected as a whole while ensuring the bending function of the bending body 11.

[0063] Furthermore, the connection method between the first connecting part 41 and the bending body 11 can be any one of welding, gluing or tenon jointing.

[0064] In one example, both the first connecting part 41 and the bending body 11 are made of metal, and the connection between the first connecting part 41 and the bending body 11 is welding. Specifically, the first connecting part 41 can be a long strip plate structure, and the side of the first connecting part 41 away from the edge-rolling channel 110 of the second plate portion 113 is fixed by welding, so as to both connect the first connecting part 41 and the bending body 11 and ensure that the edge-rolling channel 110 is unobstructed.

[0065] In another example, the first connecting part 41 and the bending body 11 can be made of metal or plastic, and the connection method between the first connecting part 41 and the bending body 11 is adhesive. Specifically, the first connecting part 41 can be a long strip-shaped structure. Adhesive is applied to the surface where the first connecting part 41 and the second plate part 113 contact each other. The first connecting part 41 and the second plate part 113 are kept connected and a certain amount of time is waited for the adhesive to solidify, so as to fix the first connecting part 41 and the second plate part 113, thereby realizing the connection between the first connecting part 41 and the bending body 11, and making the connection between the first connecting part 41 and the bending body 11 simpler and more convenient.

[0066] Furthermore, the connection method between the second connecting part 42 and the adjusting structure 20 can be any one of snap-fit ​​connection, welding or tenon joint.

[0067] In one example, the second connecting part 42 is connected to the adjusting structure 20 via a snap-fit ​​connection. Specifically, the second connecting part 42 can be a long strip-shaped structure, and it has a second groove 421 with an opening facing away from the first connecting part 41. The top of the adjusting structure 20 has a protrusion 212, and the second connecting part 42 engages with the protrusion 212 through the second groove 421, thereby connecting the second connecting part 42 to the adjusting structure 20. Further, to improve the reliability of the connection between the second connecting part 42 and the adjusting structure 20, a third fastener and a washer can be inserted through the second connecting part 42 and the protrusion 212, and the diameter of the washer is larger than the width of the second groove 421. Understandably, the third fastener can be any of a screw, bolt, or stud.

[0068] In another embodiment, both the second connecting part 42 and the adjusting structure 20 are made of metal, and the connection between the second connecting part 42 and the adjusting structure 20 is welding. Specifically, the second connecting part 42 can be a long strip plate structure, and the top of the second connecting part 42 and the adjusting structure 20 are fixed by welding, thereby making the connection between the second connecting part 42 and the adjusting structure 20 more reliable.

[0069] In some embodiments, since the pull tube 100 is used in an overlock sewing machine, the cut pieces often need to be sewn by the presser foot after passing through the bending structure 10 of the pull tube 100. The presser foot is usually connected to the needle of the overlock sewing machine. In actual sewing work, it is often necessary to adjust the needle and thread or the cut pieces to ensure that the sewing can proceed normally. Based on this, the first connecting part 41 can rotate relative to the second connecting part 42 to drive the bending body 11 to rotate relative to the second connecting part 42 and rest against the second connecting part 42. Thus, on the one hand, it can avoid the bending body 11 from interfering with the operator's line of sight when adjusting the needle and thread or the cut pieces, and on the other hand, it can reduce the volume of the pull tube 100 when it is not in use, which is beneficial for overall storage and organization.

[0070] In other embodiments, the adjusting structure 20 is provided with a first baffle 2221, and the bending body 11 can rotate relative to the adjusting structure 20 to rest against the first baffle 2221, so that the bending body 11 is folded and closed on the adjusting structure 20. Thus, not only can the bending body 11 be prevented from interfering with the operator's line of sight when adjusting the needle thread or cut piece, but the stability of the bending body 11 in the supported state can also be improved.

[0071] Specifically, the structure of the first baffle 2221 can be any of L-shaped, T-shaped or arc-shaped, to provide a support point for the bending body 11, so that the bending body 11 is more stable and reliable when it rests on the first baffle 2221.

[0072] Furthermore, the first connecting part 41 is rotatably connected to the second connecting part 42. The rotatable connection between the first connecting part 41 and the second connecting part 42 can be a hole-shaft connection. For example, the first connecting part 41 can be provided with a shaft hole, and the second connecting part 42 can be provided with a rotating shaft. The rotating shaft and the shaft hole cooperate to achieve a rotatable connection. Alternatively, the first connecting member 40 may also include a shaft connection component. The first connecting part 41 and the second connecting part 42 are respectively provided with a first through hole and a second through hole. The shaft connection component passes through the first through hole and the second through hole to achieve a rotatable connection between the first connecting part 41 and the second connecting part 42.

[0073] In some embodiments, as described above, the adjusting structure 20 has a positioning component 211 on the side facing the first opening. Based on this, the adjusting structure 20 includes a pressure block 21 and a second connecting member 22. The positioning component 211 is disposed on the pressure block 21, one end of the second connecting member 22 is connected to the side of the pressure block 21 away from the positioning component 211, and the other end of the second connecting member 22 is connected to the fixing structure 30.

[0074] In this way, the two sides of the adjusting structure 20 are respectively provided with a bending structure 10 and a fixing structure 30. By setting a positioning component 211 at one end of the adjusting structure 20 to limit the cutting piece, and fixing the other end of the adjusting structure 20 to the overlock sewing machine, the adjusting structure 20 has the function of intermediate transition, which is conducive to the maintenance and replacement of various components.

[0075] Understandably, the aforementioned protrusion 212 can be disposed on the pressure block 21 or on the second connector 22. This embodiment is described using the example of the protrusion 212 being disposed on the pressure block 21, which can effectively utilize space and reduce the size of the second connector 42.

[0076] Furthermore, the pressure block 21 is provided with a mounting groove 213 with an opening facing the second connector 22. The second connector 22 includes a first mounting portion 221 and a first fixing portion 222 connected to the first mounting portion 221. The first mounting portion 221 at least partially extends into and is connected to the mounting groove 213, and the first fixing portion 222 is connected to the fixing structure 30. This enables a detachable connection between the second connector 22 and the pressure block 21.

[0077] Please combine Figure 7 In some embodiments, the first mounting part 221 may be a long strip plate structure. The bottom surface of the first mounting part 221 is provided with a protrusion 2211. The protrusion 2211 is provided with a second connecting hole 2211a. The adjusting structure 20 also includes a second adjusting member 23 and a mounting member 24. The mounting member 24 is connected to the side of the pressure block 21 away from the positioning member 211. The mounting member 24 is provided with a third connecting hole 241 communicating with the second connecting hole 2211a. The second adjusting member 23 is movably connected to the third connecting hole 241 and the second connecting hole 2211a.

[0078] In this way, the second adjusting member 23 is connected to the second connecting hole 2211a and the third connecting hole 241. By adjusting the length of the second adjusting member 23 through the third connecting hole 241, the position of the first mounting part 221 extending into the mounting groove 213 can be adjusted, thereby adjusting the relative position of the pressure block 21 and the second connecting member 22, and thus adjusting the position of the positioning member 211 relative to the cutter. This limits the distance between the cut piece and the cutter, preventing the cut piece from being cut by the cutter, ensuring the integrity of the cut piece, and improving the quality of the finished product. At the same time, by adjusting the position of the first mounting part 221 extending into the mounting groove 213, the position of the pressure block 21 relative to the presser foot of the bending structure 10 can also be adjusted, thereby controlling the distance between the overlock stitch and the edge of the cut piece.

[0079] Furthermore, the second adjusting member 23 passes through the third connecting hole 241 of the mounting member 24, enabling the mounting member 24 to receive the second adjusting member 23 and provide support for the second adjusting member 23.

[0080] In some embodiments, as described above, one end of the second connector 22 is connected to the side of the pressure block 21 away from the positioning member 211. The second connector 22 includes a first mounting part 221 extending into the mounting groove 213 and a first fixing part 222 connected to the fixing structure 30. Meanwhile, the mounting member 24 is connected to the side of the pressure block 21 away from the positioning member 211. Based on this, the mounting member 24 is located on both sides of the first fixing part 222 and connected to the pressure block 21.

[0081] Furthermore, the mounting component 24 may include any one of a hollow square or V-shaped, U-shaped sheet structure or a plate structure, so that while ensuring that the position of the first mounting part 221 extending into the mounting groove 213 is adjustable, the mounting component 24 can provide support and fixation for the second adjusting member 23.

[0082] Furthermore, to facilitate the installation and adjustment of the second adjusting member 23, the third connecting hole 241 can communicate with the hollow part of the mounting component 24.

[0083] In some embodiments, to fix the position of the first mounting part 221 relative to the mounting groove 213, the pressure block 21 is provided with a fourth fastener 25 that can pass through it, and the fourth fastener 25 abuts against the first mounting part 221. During actual debugging and installation, the position of the first mounting part 221 extending into the mounting groove 213 is adjusted by the second adjusting member 23 to adjust the position of the positioning member 211 relative to the cutter. After the positioning member 211 is adjusted to a position that meets the sewing requirements, the fourth fastener 25 passes through the pressure block 21 and abuts against the first mounting part 221, thereby fixing the first mounting part 221 and the pressure block 21.

[0084] Specifically, the fourth fastener 25 can be any of a bolt, screw, or stud to make the position of the first mounting part 221 relative to the pressure block 21 adjustable.

[0085] It is understood that when the fourth fastener 25 is any of the components of bolt, screw or stud and passes through the pressure block 21, the pressure block 21 is provided with a threaded hole communicating with the mounting groove 213.

[0086] In some embodiments, as described above, the bending body 11 can rotate relative to the adjusting structure 20, and the bending body 11 can rotate relative to the adjusting structure 20 to rest against the second connecting part 42 or the first baffle 2221 of the adjusting structure 20. Based on this, in order to improve the stability of the bending body 11 after rotation and resting against other structures, the second connecting member 22 further includes a transition part 223. The transition part 223 extends upward from the side of the first mounting part 221 away from the pressure block 21 to connect with the first fixing part 222, so that the distance from the plane of the first fixing part 222 to the bottom surface of the pressure block 21 is greater than the distance from the plane of the first mounting part 221 to the bottom surface of the pressure block 21. In this way, the height of the second connecting member 22 can be increased, so that when the bending body 11 rotates to rest against other structures, the second connecting member 22 can provide support for the bending body 11.

[0087] In one example, when the bending body 11 rotates relative to the adjusting structure 20 to rest against the second connecting part 42, the height of the second connecting part 22 can be increased by adding the transition part 223, thereby providing another support point for the bending body 11 and improving the stability of the bending body 11 in the support state.

[0088] In another example, when the bending body 11 rotates relative to the adjusting structure 20 and rests against the first baffle 2221 of the adjusting structure 20, the first baffle 2221 can be set on the first fixing part 222. By adding the transition part 223, the height of the first baffle 2221 can be increased so that the bending body 11 can rest against it.

[0089] In some embodiments, the fixing structure 30 includes a third connector 31 and a fourth connector 32 connected to the third connector 31. The third connector 31 is connected to the adjusting structure 20, and the fourth connector 32 is used to connect to the overlock sewing machine. This allows the bending structure 10, the adjusting structure 20, and the fixing structure 30 to be connected as a whole, and fixes the pull cylinder 100 to the overlock sewing machine.

[0090] Furthermore, the third connector 31 and the fourth connector 32 can be long strip-shaped structures, and the end of the third connector 31 near the adjusting structure 20 is provided with a first bending part 310. The first bending part 310 is connected to the side of the first fixing part 222 away from the transition part 223, so that not only can the third connector 31 be fixed to the adjusting structure 20, but also the structure of the second connector 22 can be fully utilized, thereby reducing the overall size of the pull tube 100.

[0091] In some embodiments, the end of the fourth connector 32 near the overlock sewing machine is provided with a second bending portion 320. The second bending portion 320 is provided with a fixing hole 321 along the length direction of the fourth connector 32. The fourth connector 32 is connected to the overlock sewing machine through the fixing hole 321, thereby fixing the entire pull tube 100 to the overlock sewing machine.

[0092] Please combine Figure 8 In some embodiments, the fourth connector 32 is rotatably connected to the third connector 31, so that it can rotate relative to the third connector 31 and be stacked on the third connector 31. In this way, on the one hand, the position of the pull tube 100 relative to the overlock sewing machine can be adjusted to adjust the angle and relative position of the cut piece entering the presser foot through the pull tube 100. On the other hand, when not in use, the volume of the pull tube 100 can be reduced, which is beneficial for overall storage and organization.

[0093] Furthermore, the second bend 320 has the opposite bending direction to the first bend 310, and the first bend 310 extends away from the fourth connector 32, while the second bend 320 extends away from the third connector 31. This allows the first bend 310 and the second bend 320 to fix the third connector 31 and the fourth connector 32 respectively while avoiding mutual interference, thereby enabling the fourth connector 32 to rotate relative to the third connector 31 and stack on the third connector 31.

[0094] Furthermore, the third connector 31 is provided with a limiting member 311, and the fourth connector 32 is correspondingly provided with a third groove 322 with an opening facing the limiting member 311. Thus, when the fourth connector 32 is stacked on the third connector 31, the limiting member 311 is at least partially disposed within the third groove 322 to maintain the state and position of the fourth connector 32 stacked on the third connector 31.

[0095] Specifically, to facilitate the entry and exit of the limiting member 311 into the third groove 322, the limiting member 311 may be a semi-circular or arc-shaped structure, such as a semi-circular head screw or a semi-circular head bolt.

[0096] Furthermore, the fixing structure 30 also includes an elastic member 33, one end of which is fixed to the third connector 31, and the other end of which is tilted away from the third connector 31 and connected to the limiting member 311. The elastic member 33 is used to make the limiting member 311 movable relative to the third connector 31.

[0097] In this way, by utilizing the elastic deformation capability of the elastic member 33, the limiting member 311 can move relative to the third connecting member 31, so that the limiting member 311 can be accommodated in the third groove 322 or disengaged from the third groove 322.

[0098] For example, when the fourth connector 32 is in a state of being horizontally positioned with the third connector 31, the elastic member 33 is in force balance, and the positions of the elastic member 33 and the limiting member 311 are relatively stable. When the fourth connector 32 rotates toward the direction of being stacked on the third connector 31, the limiting member 311 restricts and hinders the fourth connector 32, preventing it from being stacked on the third connector 31. By applying an external force to the fourth connector 32 relative to the limiting member 311, the elastic member 33 connected to the limiting member 311 deforms. At this time, the elastic member 33 moves away from the third connector 31, thereby causing the limiting member 311 to move relative to the third connector 31, allowing the fourth connector 32 to be stacked on the third connector 31. When the fourth connector 32 rotates until the third groove 322 aligns with the limiting member 311, the external force on the limiting member 311 decreases, and the elastic member 33 returns to its initial state under the action of elastic force. The limiting member 311 moves accordingly, so that the limiting member 311 is partially disposed in the third groove 322. At this time, the limiting member 311 can restrict the state and position of the fourth connector 32.

[0099] Specifically, the elastic member 33 may be a spring sheet or a silicone sheet, thereby providing elastic force to the restraint member 311.

[0100] In other embodiments, the fourth connector 32 is slidably connected to the third connector 31 so that the length of the fixing structure 30 is adjustable. This allows the position of the pull tube 100 relative to the overlock sewing machine to be adjusted so as to adjust the relative position of the cut piece as it enters the presser foot through the pull tube 100, thereby controlling the position of the overlock stitch from the edge of the cut piece. On the other hand, it also reduces the volume of the pull tube 100, which is beneficial for overall storage and organization.

[0101] Furthermore, the fourth connector 32 is provided with a third slide groove along its own length direction, and the third connector 31 is provided with a positioning hole communicating with the third slide groove and a fastener connecting the third slide groove and the positioning hole. The third slide groove can move relative to the positioning hole to adjust the relative position of the fourth connector 32 and the third connector 31.

[0102] Please see Figure 9Secondly, embodiments of the present invention also provide an overlock sewing machine 200, which includes a machine body 102, a presser foot 101, and a pull cylinder 100 as described in the first aspect. The presser foot 101 and the pull cylinder 100 are respectively fixed to the machine body 102, and the presser foot 101 is disposed at the rear end of the pull cylinder 100 along the direction of fabric conveying, for sewing the fabric passing through the pull cylinder 100. It is understood that since the overlock sewing machine 200 includes the pull cylinder 100 described in the first aspect, the overlock sewing machine 200 has the beneficial effects of the pull cylinder 100 described in the first aspect, which will not be elaborated further here.

[0103] The foregoing has provided a detailed description of the pull tube and overlock sewing machine disclosed in the embodiments of the present invention. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the pull tube and overlock sewing machine of the present invention and its core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A pull tube, characterized in that, include: A fixing structure having opposing first and second ends, the first end being used to fix to an overlock sewing machine; Adjustable distance structure, the adjustable distance structure being connected to the second end, the adjustable distance structure being provided with a positioning component; and A bending structure includes a bending body and a slider. The bending body is connected to an adjusting structure. The bending body has a hemming channel with a first opening, a second opening, and a third opening. The first opening faces the positioning component of the adjusting structure. The second and third openings are opposite to each other and are used for passing through a cut piece. The hemming channel is configured to fold the cut piece. The slider is slidably disposed in the hemming channel and can move relative to the hemming channel in a direction toward or away from the first opening to adjust the distance between the slider and the positioning component, so that the slider and the positioning component are configured to jointly limit the position of the cut piece in the hemming channel. The pull tube further includes a first connector, which is located on the bending body and the adjusting structure, and is connected to the bending body and the adjusting structure. The first connector includes a first connecting part and a second connecting part. The first connecting part is rotatably connected to the second connecting part and is connected to the bending body. The second connecting part is connected to the adjusting structure. The first connecting part can rotate relative to the second connecting part to drive the bending body to rotate relative to the second connecting part and rest against the second connecting part. Alternatively, the adjusting structure is provided with a first baffle, and the bending body can rotate relative to the adjusting structure to rest against the first baffle. The adjusting structure includes a pressure block and a second connecting member. The pressure block is provided with the positioning component. One end of the second connecting member is connected to the side of the pressure block away from the positioning component, and the other end of the second connecting member is connected to the fixing structure. The pressure block is provided with a mounting groove with an opening facing the second connecting member. The second connecting member includes a first mounting part and a first fixing part connected to the first mounting part. The first mounting part extends at least partially into the mounting groove and is connected to the mounting groove. The first fixing part is connected to the fixing structure. The first mounting part is movably connected to the mounting groove, and the adjustment structure further includes a second adjustment member, which is connected to the pressure block and the first mounting part to adjust the position of the first mounting part extending into the mounting groove.

2. The pull tube according to claim 1, characterized in that, The bending body is provided with a first groove communicating with the edge-rolling channel. The first groove extends along the length direction of the edge-rolling channel. The slider is provided with a first connecting hole communicating with the first groove. The pull cylinder also includes a first fastener, which passes through the first groove and the first connecting hole to connect the slider with the bending body.

3. The pull tube according to claim 1, characterized in that, The bending structure further includes a first adjusting member, which is disposed in the edge-rolling channel along the height direction of the edge-rolling channel. The first adjusting member is provided with a second sliding groove, which is connected to the edge-rolling channel and extends along the length direction of the edge-rolling channel. The slider is slidably connected to the second sliding groove.

4. The pull tube according to claim 3, characterized in that, The first adjusting member is movably disposed relative to the bending body along the height direction of the crimping channel.

5. The pull tube according to any one of claims 1-4, characterized in that, The bottom surface of the first mounting part is provided with a protrusion, and the protrusion is provided with a second connecting hole. The adjustment structure also includes a mounting component, which is connected to the side of the pressure block opposite to the positioning component. The mounting component is provided with a third connecting hole communicating with the second connecting hole. The second adjusting member is movably connected to the third connecting hole and the second connecting hole.

6. The pull tube according to any one of claims 1-4, characterized in that, The second connector further includes a transition portion that extends upward from the side of the first mounting portion away from the pressure block to connect with the first fixing portion, such that the distance from the plane of the first fixing portion to the bottom surface of the pressure block is greater than the distance from the plane of the first mounting portion to the bottom surface of the pressure block.

7. The pull tube according to any one of claims 1-4, characterized in that, The fixing structure includes a third connector and a fourth connector connected to the third connector. The third connector is connected to the adjusting structure, and the fourth connector is used to connect to the overlock sewing machine.

8. The pull tube according to claim 7, characterized in that, The fourth connector is rotatably connected to the third connector so as to rotate relative to the third connector to overlap the third connector, or the fourth connector is slidably connected to the third connector.

9. The pull tube according to claim 8, characterized in that, When the fourth connector is rotatably connected to the third connector, the third connector is provided with a limiting member, which is used to connect with the fourth connector to limit the position of the fourth connector stacked on the third connector.

10. The pull tube according to claim 9, characterized in that, The fixing structure further includes an elastic member, one end of which is connected to the third connector and the other end of which is connected to the limiting member. The elastic member is used to make the limiting member movable relative to the third connector.

11. An overlock sewing machine, characterized in that, The overlock sewing machine includes an overlock sewing machine body, a presser foot, and a pull cylinder as described in any one of claims 1-10, wherein the fixing structure of the presser foot and the pull cylinder are respectively connected to the overlock sewing machine body.

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