A drawing cylinder device for a trouser waist and a sewing machine

Abstract

The present application relates to the field of sewing equipment, and provides a draw-in device for a trouser waist, which includes a first draw-in structure, a second draw-in structure, a connecting member, a switching member and a mounting member; the switching member is detachably connected to the mounting member; the connecting member is mounted on the switching member; the first draw-in structure is mounted at one end of the connecting member; the second draw-in structure is mounted at the other end of the connecting member; when the second draw-in structure or the first draw-in structure is needed, the switching member is taken out of the mounting member and rotated to switch the second draw-in structure or the first draw-in structure. The present application has the effect of conveniently replacing the required draw-in structure. In addition, a sewing machine is also provided.

Description

Technical Field

[0001] The present application relates to the field of sewing equipment, and particularly to a draw-in device for a trouser waist and a sewing machine. Background Art

[0002] A draw-in is also known as a hemming device or a side-seam device, commonly called a nozzle, and is an auxiliary tool for various clothing, leather, and luggage sewing equipment. The draw-in is mainly used for processes such as collar rolling, edge rolling, card embedding, welt insertion, edge binding, hemming, folding, bordering, leg pulling, tape pulling, and strip pasting during the sewing of various fabrics; for specific product structures, specialized draw-ins for waistbands, trouser waists, earpieces, high heads, towels, ropes, pockets, furs, etc. are derived, and some complex process requirements require the special development of draw-ins.

[0003] Currently, draw-ins have draw-in structures adapted to different shapes, structures, and styles according to the sewing styles required, such as a straight-edge draw-in for sewing a straight trouser waist or an arc-edge draw-in for sewing an arc-shaped trouser waist. When sewing trouser waists of different styles, the corresponding draw-ins need to be replaced. However, draw-ins are generally bolted to the installation platform of the sewing machine, and the disassembly and replacement are troublesome, affecting the sewing efficiency. Summary of the Invention

[0004] To improve the above problems, the present application provides a draw-in device for a trouser waist and a sewing machine.

[0005] The draw-in device for a trouser waist and the sewing machine provided by the present application adopt the following technical solutions:

[0006] A draw-in device for a trouser waist includes a first draw-in structure, a second draw-in structure, a connecting member, a switching member, and a mounting member; the switching member is detachably connected to the mounting member; the connecting member is mounted on the switching member; the first draw-in structure is mounted at one end of the connecting member; the second draw-in structure is mounted at the other end of the connecting member; when the second draw-in structure or the first draw-in structure is needed, the switching member is taken out of the mounting member and rotated to switch the second draw-in structure or the first draw-in structure.

[0007] By adopting the above technical solution, after the switching member is separated from the mounting member, the first draw-in structure and the second draw-in structure are connected together through the connecting member, and the positions of the first draw-in structure and the second draw-in structure are swapped by rotating the switching member along the mounting member, and then the switching member is connected to the mounting member, so as to fix the first draw-in structure and the second draw-in structure, achieving the effect of conveniently replacing the required draw-in structure.

[0008] Optionally, the connecting member includes a connecting portion, a first fastening portion, and a second fastening portion; the first fastening portions are mounted on both side surfaces of the connecting portion, and fastening grooves are formed in the first fastening portions; the second cylinder structure and the first cylinder structure are provided with the second fastening portions, and both the second cylinder structure and the first cylinder structure are connected to the corresponding first fastening portions through the second fastening portions and the fastening grooves.

[0009] By adopting the above technical solution, both the second cylinder structure and the first cylinder structure insert the second fastening portion into the fastening groove, and then continuously extend the second fastening portion along the fastening groove until the second fastening portion completely extends into the fastening groove, so as to fix the second cylinder structure and the first cylinder structure on the rectangular plate. When it is necessary to take out the second cylinder structure or the first cylinder structure, the cylinder structure to be taken out is pulled along the fastening groove to disengage the second fastening portion from the fastening groove, so as to facilitate detaching, replacing or repairing the second cylinder structure and the first cylinder structure.

[0010] Optionally, a rotating portion and a protruding portion are provided on the connecting portion; the rotating portion is connected to the protruding portion, and the rotating portion is located on the outer surface of the switching member; the protruding portion is located in the two fastening grooves; the second fastening portion is provided with a groove, and the protruding portion is connected to the second fastening portion through the groove.

[0011] By adopting the above technical solution, the rotating portion can rotate along the switching member to drive the protruding portion to rotate. When the protruding portion rotates with the rotating portion, it can rotate into the fastening groove and be stuck in the groove to limit the second fastening portion and ensure the stability of the installation.

[0012] Optionally, internal threads are formed in the groove, external threads are formed on the surface of the protruding portion, and the protruding portion is screwed to the second fastening portion through the external threads and the internal threads.

[0013] By adopting the above technical solution, the protruding portion is screwed to the groove of the second fastening portion through the external threads and the internal threads, further improving the connection stability between the protruding portion and the groove.

[0014] Optionally, the switching member includes a switching portion and a clamping portion; the clamping portion is mounted on the switching portion, and the distance from the clamping portion to the middle of the switching portion is less than the distance to the edge; the connecting member is connected to the switching portion; the mounting member includes a mounting portion and an inserting portion; mounting holes for connecting to an external sewing machine are uniformly formed in the mounting portion, the inserting portion is mounted on one surface of the mounting portion, an inserting groove is formed in the inserting portion, and the inserting groove matches the switching portion and the clamping portion; the switching portion is inserted into the inserting groove and gradually extends until the clamping portion completely inserts into the inserting groove.

[0015] By adopting the above technical solution, the installation part is installed on the sewing machine. When the second draw-in structure or the first draw-in structure needs to be used, the switching part is pulled outwards from the insertion slot, so that the clamping part disengages from the insertion slot. After the switching part loses the restriction of the clamping part, it rotates along the insertion slot to drive the connecting part to rotate, thereby switching the second draw-in structure or the first draw-in structure on the connecting part. After switching to the draw-in structure to be used, the clamping part is aligned with the insertion slot and inserted therein, so that the clamping part is limited by the insertion slot and the switching shaft cannot rotate, and the required draw-in structure can be used to sew the trouser waist.

[0016] Optionally, the mounting member is further provided with a locking member; the clamping part is provided with a clamping groove; the locking member is installed outside the insertion part and extends through the insertion part into the insertion slot and is inserted into the clamping groove.

[0017] By adopting the above technical solution, after the clamping part is inserted into the insertion slot, the locking member passes through the insertion part and is inserted into the clamping groove, thereby limiting the clamping part to ensure the use stability of the first draw-in structure and the second draw-in structure after switching.

[0018] Optionally, at least two locking members are provided, and a linkage member is provided between the locking members.

[0019] By adopting the above technical solution, all the locking members can be pulled out of the clamping groove simultaneously through the linkage member. Setting multiple locking members can provide multi-point locking and improve the locking effect.

[0020] Optionally, the mounting member further includes a fastening part; the fastening part is installed at one end of the connecting part away from the switching member.

[0021] By adopting the above technical solution, the fastening part is inserted into the external sewing machine, and a tightening effect is formed between the fastening part and the external sewing machine, so that the connecting part can be supported to achieve the effect of convenient disassembly and assembly.

[0022] Optionally, the fastening part is provided with several bends.

[0023] By adopting the above technical solution, when the fastening part is installed on the external sewing machine, multi-segment bends provide multi-point tightening to further ensure the stability of installation and support.

[0024] A sewing machine includes the above-mentioned draw-in device for the trouser waist.

[0025] By adopting the above technical solution, the sewing machine can be adaptively installed and used with the draw-in device to stably use the draw-in device to provide sewing for the trouser waist of the sewing machine.

[0026] In summary, the present application includes at least the following beneficial technical effects:

[0027] 1. After the switching member is separated from the mounting member, the first draw cylinder structure and the second draw cylinder structure are connected together through the connecting member, and the positions of the first draw cylinder structure and the second draw cylinder structure are swapped by rotating the switching member along the mounting member. Then, the switching member is connected to the mounting member, and the first draw cylinder structure and the second draw cylinder structure can be fixed, so as to achieve the function of conveniently replacing the required draw cylinder structure;

[0028] 2. Install the installation part at the sewing machine. When the second draw cylinder structure or the first draw cylinder structure is needed, pull the switching part outwards from the insertion slot, so that the clamping part is separated from the insertion slot. After the switching part loses the restriction of the clamping part, it rotates along the insertion slot to drive the connecting part to rotate, thereby switching the second draw cylinder structure or the first draw cylinder structure on the connecting part. After switching to the required draw cylinder structure, the clamping part is aligned with the insertion slot and inserted into it, so that the clamping part is limited by the insertion slot and the switching shaft cannot rotate, and the required draw cylinder structure can be used to sew the waistband;

[0029] 3. Both the second draw cylinder structure and the first draw cylinder structure use the second buckling part to insert into the buckling slot, and then the second buckling part is continuously extended along the buckling slot until the second buckling part completely extends into the buckling slot, so as to fix the second draw cylinder structure and the first draw cylinder structure on the rectangular plate. When the second draw cylinder structure or the first draw cylinder structure needs to be taken out, pull the required draw cylinder structure along the buckling slot to make the second buckling part separate from the buckling slot, so as to facilitate the separation, replacement or repair of the second draw cylinder structure and the first draw cylinder structure;

[0030] 4. The rotating part can rotate along the switching member to drive the protruding part to rotate. When the protruding part rotates with the rotating part, it can rotate into the buckling slot and be stuck in the groove to limit the second buckling part and ensure the stability of the installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is the first three-dimensional structural schematic diagram of the draw cylinder device in an embodiment of the present application;

[0032] Figure 2 is the first three-dimensional structural schematic diagram of the separation of the mounting member and the switching member in some embodiments of the present application;

[0033] Figure 3 is the three-dimensional structural schematic diagram of the insertion cavity in some embodiments of the present application;

[0034] Figure 4 is the second three-dimensional structural schematic diagram of the separation of the mounting member and the switching member in some embodiments of the present application;

[0035] Figure 5 is the three-dimensional structural schematic diagram of the insertion part in some embodiments of the present application;

[0036] Figure 6 It is a schematic perspective view of another angle of the draw-in device in some embodiments of the present application;

[0037] Figure 7 It is a schematic perspective view of the connecting member in some embodiments of the present application;

[0038] Figure 8 It is a schematic cross-sectional view of the connecting member in some embodiments of the present application;

[0039] Figure 9 It is a second schematic perspective view of the draw-in device in some embodiments of the present application;

[0040] Figure 10 It is a schematic perspective view of the sewing machine in some embodiments of the present application;

[0041] The reference numerals in the drawings are: 1. First draw-in structure, 2. Second draw-in structure, 3. Connecting member, 31. Connecting portion, 32. First buckling portion, 321. Buckling groove, 33. Second buckling portion, 331. Groove, 34. Rotating portion, 35. Protruding portion, 4. Switching member, 41. Switching portion, 42. Clamping portion, 421. Clamping groove, 5. Mounting member, 51. Mounting portion, 52. Insertion portion, 521. Insertion groove, 53. Buckling portion, 6. Locking member, 7. Linking member. Detailed embodiments

[0042] The following uses specific examples to illustrate the embodiments of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the information disclosed in the present application. The present application can also be implemented or applied through other different specific embodiments. Various details in the present application can also be modified or changed according to different viewpoints and applications without departing from the spirit of the present application. It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0043] The following takes the drawings as a reference and details the embodiments of the present application so that those skilled in the technical field to which the present application belongs can easily implement it. The present application can be embodied in many different forms and is not limited to the embodiments described herein.

[0044] In the description of the present application, the expressions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics represented in connection with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials, or characteristics represented can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples represented in the present application and the features of different embodiments or examples.

[0045] In addition, the terms "first" and "second" are only used to indicate a target, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0046] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the case of "direct connection", but also the case of "indirect connection" in which other elements are placed therebetween. In addition, when it is said that a certain device "includes" a certain component, unless there is a particularly contrary record, it does not exclude other components, but means that other components can also be included.

[0047] The following is a further detailed description of the present application in conjunction with the attached Figure 1 - attached Figure 10 , for a further detailed description of the present application.

[0048] An embodiment of the present application discloses a drawstring device for a trouser waist and a sewing machine.

[0049] A drawstring device for a trouser waist, referring to Figure 1, including a first drawtube structure 1, a second drawtube structure 2, a connecting piece 3, a switching piece 4 and a mounting piece 5; the first drawtube structure 1 is similar to the second drawtube structure 2, mainly composed of a folding shell and a bottom shell. A space or channel for the waistband fabric to enter and exit is formed between the folding shell and the bottom shell, and a sewing opening for the needle of an external sewing machine to sew is provided on the surface of the folding shell, which is mainly used for sewing the waistband. The corners of the fabric will pass through the bending part between the folding shell and the bottom shell, so that the fabric is folded to form a hem, and the hem corresponds to the sewing opening, so as to use an external sewing machine to sew the hem. The sewing pattern will be different with different drawtube structures used. The difference between the first drawtube structure 1 and the second drawtube structure 2 lies in the different sewing patterns. For example, one folding shell is a vertical folding shell, and the other folding shell has a certain arc. When the silk thread is sewing, the fabric automatically moves forward along the folding shell under the drive of the sewing machine to form a hem, so as to sew different styles of waistbands. Among them, the first drawtube structure 1 and the second drawtube structure 2 are not limited to straight edges or arc edges, and can also be sewn into other styles of waistbands as required. The specific sewable styles are not limited here. Only taking the first drawtube structure 1 sewing a straight edge and the second drawtube structure 2 sewing an arc edge as an example.

[0050] The mounting piece 5 is used to connect with an external sewing machine. The mounting piece 5 can adopt a mounting plate made of metal material. A number of mounting holes can be arranged on the mounting plate and locked to the external sewing machine through bolts. The mounting holes can adopt strip-shaped holes, and the strip-shaped holes can facilitate the adjustment of the mounting position of the mounting piece 5 on the external sewing machine, that is, the locking point of the bolt and the external sewing machine is fixed. Through the strip-shaped holes, the mounting plate can be moved along one end of the strip-shaped hole, and after determining the position, it is locked through bolts.

[0051] The switching piece 4 is detachably connected to the mounting piece 5. The switching piece 4 is used to switch between the first drawtube structure 1 and the second drawtube structure 2. The mounting piece 5 and the switching piece 4 are detachably connected, so that the switching piece 4 can be conveniently detached from the mounting plate.

[0052] Further, referring to Figure 2 As shown, the switching piece 4 includes a switching part 41 and a clamping part 42; the clamping part 42 is installed on the switching part 41, and the distance from the clamping part 42 to the middle of the switching part 41 is less than the distance to the edge. The connecting piece 3 is connected to the switching part 41. The clamping part 42 can adopt a rectangular clamping plate or a rhombic clamping plate. The switching part 41 can adopt a switching shaft. The clamping plate is located at a position close to the center along the length direction of the switching shaft, specifically at two-thirds of the switching shaft extending towards the mounting piece 5.

[0053] Referring to Figure 2 and Figure 3As shown, the mounting member 5 includes a mounting portion 51 and an insertion portion 52; the mounting portion 51 is evenly provided with mounting holes for connecting to an external sewing machine, the insertion portion 52 is installed on a surface of the mounting portion 51, and the insertion portion 52 is provided with an insertion groove 521, and the insertion groove 521 matches the switching portion 41 and the clamping portion 42. The mounting portion 51 can be a mounting plate, and its structure is consistent with the above-mentioned mounting plate. The insertion portion 52 can adopt an insertion tube, and the inner groove shape of the insertion groove 521 matches the clamping plate and the switching shaft, so that the switching shaft and the clamping plate can be inserted therein. Specifically, the switching shaft is first inserted into the insertion groove 521, and gradually extends in until the clamping plate is completely inserted into the insertion groove 521.

[0054] The connecting member 3 is installed on the switching member 4, specifically can be connected to the switching shaft, the connecting member 3 is used to connect the first pull cylinder structure 1 with the second pull cylinder structure 2, the connecting member 3 can adopt a connecting plate, the first pull cylinder structure 1 is installed on the plane of one end of the connecting plate, the second pull cylinder structure 2 is installed on the plane of the other end of the connecting plate.

[0055] The size of the connecting plate can determine the number of pull-bar structures that can be carried. For example, when the connecting plate is a block structure, different styles of pull-bar structures can be set on the four sides of the connecting plate, that is, four types of pull-bar structures can be installed and switched. In this embodiment, the two sides of the connecting plate are used as installation points for the pull-bar structures, so only the first pull-bar structure 1 and the second pull-bar structure 2 are taken as examples.

[0056] Specifically, the mounting plate is bolted to the sewing machine. When the second barrel structure 2 or the first barrel structure 1 is needed, the switching shaft is pulled outward from the insertion groove 521 to disengage the clamping plate from the insertion groove 521. After the switching shaft loses the restriction of the clamping plate, it rotates along the insertion groove 521 to drive the connecting plate to rotate, thereby switching the second barrel structure 2 or the first barrel structure 1 on the connecting plate. After switching to the barrel structure to be used, the clamping plate is aligned with the insertion groove 521 and inserted into it, so that the clamping plate is limited by the insertion groove 521 and the switching shaft cannot rotate. The required barrel structure can then be used to sew the trouser waist.

[0057] When installed on a sewing machine, the position of the mounting member 5 can be installed in the opposite direction, that is, the mounting member 5 is facing downward, so as not to affect the sewing of the trouser waist from top to bottom at the output end of the sewing machine. Figure 2 As shown, the insertion portion 52 can extend outward along the mounting portion 51 to ensure that the mounting portion 51 is not obstructed by the insertion portion 52 when the sewing machine is connected.

[0058] In some embodiments, reference Figure 4As shown, the mounting member 5 is also provided with a locking member 6; the clamping portion 42 is provided with a clamping groove 421, and the clamping grooves 421 are provided on both side surfaces of the clamping portion 42, and the clamping grooves 421 are switched to different surfaces by the switching portion 41 to provide a clamping effect; the locking member 6 is installed on the outside of the insertion portion 52, and passes through the insertion portion 52 to extend into the insertion groove 521 and is inserted into the clamping groove 421, and the locking member 6 is used to lock the clamping plate so that during sewing, the clamping plate will not be affected by the force and will not be separated from the insertion groove 521, resulting in the second pull cylinder structure 2 and the first pull cylinder structure 1 being unstable in position, and rotating by itself under force, etc.

[0059] Among them, reference Figure 5 As shown, the locking member 6 may include a locking cylinder, a telescopic rod and a spring. The locking cylinder is installed on the outer wall of the insertion cylinder and is connected to the insertion cylinder. The telescopic rod is inserted into the telescopic cylinder, and a protrusion is arranged in the telescopic cylinder for installing a spring. The spring is located in the telescopic cylinder, and one end is connected to the protrusion in the telescopic cylinder, and the other end is wound around the telescopic rod and connected to the telescopic rod. The spring applies a force to the telescopic rod to push it into the insertion groove 521. The end of the telescopic rod close to the clamping plate is in an arc shape. Before the clamping plate enters the insertion groove 521, the end close to the insertion groove 521 is in a wedge-shaped edge, and the clamping plate is provided with a clamping groove 421 on a side close to the telescopic cylinder. The telescopic rod can be inserted into the clamping groove 421 to limit the clamping plate.

[0060] Specifically, the switching shaft is pushed to move the switching shaft and the clamping plate into the insertion groove 521. During the movement of the clamping plate, the wedge-shaped edge at one end in the moving direction contacts the arc-shaped end of the telescopic rod, and the telescopic rod is pushed toward the telescopic cylinder as the clamping plate moves, until the clamping groove 421 of the clamping plate is connected with the telescopic rod. The telescopic rod is then clamped into the clamping groove 421 by the action of the spring, so that the clamping plate and the switching shaft cannot continue to move, thereby limiting the clamping plate and preventing the clamping plate from disengaging from the insertion groove 521. When the clamping plate needs to be removed to replace the second pull cylinder structure 2 or the first pull cylinder structure 1, the user pinches or holds the end of the telescopic rod away from the clamping groove 421 and pulls it in the opposite direction of the clamping groove 421 to disengage from the clamping groove 421. The clamping plate loses the limiting effect of the telescopic rod and can be pulled out along the insertion groove 521 to switch the second pull cylinder structure 2 or the first pull cylinder structure 1.

[0061] Among them, another implementation of the locking member 6 may include that the telescopic rod is a permanent magnet, the surface of the clamping plate is plated with a magnetically attractive metal layer, or the material of the clamping plate itself may be a magnetically attractive material, such as an iron layer or iron material. In this case, there is no need to use a spring. Through the mutual magnetic attraction between the permanent magnet and the clamping plate, when the clamping groove 421 of the clamping plate is moved to the telescopic rod, it is magnetically attracted and clamped into the clamping groove 421, thereby achieving limited clamping through the clamping plate. The specific implementation method is not limited here and is applicable to all.

[0062] If the telescopic rod is stuck or in other situations, when the clamping plate is inserted into the insertion slot 521, it cannot push the telescopic rod towards the telescopic cylinder. In this case, a pulling force can be applied to the telescopic rod when the clamping plate is inserted into the insertion slot 521, pulling the telescopic rod outwards until the clamping plate is inserted into the insertion slot, and then releasing the telescopic rod, so that the telescopic rod can be inserted into the clamping slot 421 without being stuck.

[0063] Furthermore, at least two locking members 6 are provided, and a linkage member 7 is provided between the locking members 6. When there are more than two, such as four, four linkage members 7 are provided to connect the four locking members 6 into a quadrilateral. In this embodiment, two are taken as an example, and the linkage member 7 can be a linkage frame. By applying a pulling force to only one of the locking members 6 or the linkage frame, all the locking members 6 can be pulled out of the clamping slot 421 simultaneously. Providing multiple locking members 6 can provide multi-point locking and improve the locking effect, while the linkage frame can make it easier for multiple locking members 6 to disengage from the clamping slot 421, improving the convenience of removing the clamping plate.

[0064] Furthermore, referring to Figure 6 As shown, the connecting member 3 includes a connecting portion 31, a first fastening portion 32, and a second fastening portion 33; the first fastening portions 32 are installed on both side surfaces of the connecting portion 31, and a fastening slot 321 is provided on the first fastening portion 32. The connecting portion 31 can be a connecting plate, and the first fastening portion 32 can be a rectangular plate, and the fastening slot 321 is provided in the rectangular plate.

[0065] Both the second cylinder structure 2 and the first cylinder structure 1 are provided with the second fastening portion 33. The second fastening portion 33 can be a fastening plate with a bend, such as an L-shaped plate. The second cylinder structure 2 and the first cylinder structure 1 are respectively inserted into the fastening slot 321 by the corresponding fastening plates, so that the second cylinder structure 2 and the first cylinder structure 1 are respectively inserted and connected with the corresponding rectangular plates.

[0066] Specifically, both the second cylinder structure 2 and the first cylinder structure 1 use the fastening plates to be inserted into the fastening slot 321, and then the fastening plates are continuously extended along the fastening slot 321 until the fastening plates are completely extended into the fastening slot 321, thereby fixing the second cylinder structure 2 and the first cylinder structure 1 on the rectangular plate. When it is necessary to remove the second cylinder structure 2 or the first cylinder structure 1, the cylinder structure to be removed is pulled along the fastening slot 321 to make the fastening plate disengage from the fastening slot 321, so as to facilitate the removal, replacement or repair of the second cylinder structure 2 and the first cylinder structure 1.

[0067] In some embodiments, a rotating portion 34 and a protruding portion 35 are provided on the connecting portion 31. The rotating portion 34 is connected to the protruding portion 35, and the rotating portion 34 is located on the outer surface of the switching member 4, and the protruding portion 35 is located in the two buckling grooves 321. The rotating portion 34 is further a rotating cylinder, and the protruding portion 35 may be two protruding blocks. The two protruding blocks are installed on the outer wall of the rotating cylinder and are symmetrically arranged along the center point of the rotating cylinder. The rotating cylinder is sleeved on the end of the switching shaft away from the mounting plate. Therefore, the rotating cylinder can rotate along the switching shaft to drive the two protruding blocks to rotate. Through holes for the protruding blocks to enter the buckling grooves 321 are formed at the corresponding positions of the rectangular plate and the protruding blocks. When the protruding blocks rotate with the rotating cylinder, they can rotate into the buckling grooves 321 through the through holes or rotate out of the buckling grooves 321.

[0068] A groove 331 is provided on the second buckling portion 33, and the protruding portion 35 is connected to the second buckling portion 33 through the groove 331. That is, after the buckling plate is inserted into the buckling groove 321, the position of the groove 331 is the same as that of the through hole. At this time, by rotating the rotating cylinder, the two protruding blocks can be driven to insert into the groove 331, thereby limiting the buckling plate and preventing the buckling plate from disengaging from the buckling groove 321, thus ensuring stability.

[0069] When it is necessary to take out the first draw cylinder structure 1 and the second draw cylinder structure 2 from the buckling groove 321, rotate the rotating cylinder to make the protruding blocks rotate out of the buckling groove 321 through the through holes, so that the buckling plate loses the limiting effect of the protruding blocks and can be taken out of the buckling groove 321, so as to perform operations such as maintenance and replacement on the first draw cylinder structure 1 and the second draw cylinder structure 2.

[0070] Furthermore, internal threads are provided in the groove 331, and external threads are provided on the surface of the protruding block. The protruding block is screwed to the groove 331 of the buckling plate through the external threads and the internal threads. When the protruding block continuously rotates into the groove 331 with the rotating cylinder, the connection stability between the protruding block and the groove 331 can be further improved through the internal threads and the external threads.

[0071] In some embodiments, the mounting member 5 further includes a buckling portion 53; the buckling portion 53 is installed at one end of the connecting portion 31 away from the switching member 4. The buckling portion 53 may be a buckling plate made of a metal material, which is specifically used to connect to the sewing machine and can be directly used without using fasteners such as bolts for locking.

[0072] Specifically, a socket is formed on the mounting platform of the sewing machine. By inserting the buckling plate into the socket, the buckling plate forms an abutting effect through contact with the socket, so as to support the connecting plate and achieve the effect of convenient disassembly and assembly.

[0073] Further, refer to Figure 10As shown, the fastening part 53 is provided with several bends, and openings can be formed at the ends of the bends. The whole fastening plate is bent in multiple segments to form a rectangular cross-section with openings. At this time, the sewing machine can be provided with insertion rods, and the insertion rods also adopt cross-sections matching the rectangular cross-section of the fastening plate, so that the fastening plate can be inserted along the insertion rods. The multi-segment bending provides multiple points of tight fit to further ensure the stability of installation and support.

[0074] The fastening part 53 can adopt a magnet sheet with a magnetic attraction effect. The sewing machine can be provided with an iron sheet. When the fastening part 53 is connected to the sewing machine, they are magnetically attracted to each other to stabilize the position of the fastening part 53 and reduce the deviation phenomenon.

[0075] According to the draw-in device for the waistband in one of the above embodiments, refer to Figure 10 As shown, it is included in a sewing machine, and through this sewing machine, the draw-in device can be adaptively installed and used.

[0076] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. The same components are represented by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A drawing cylinder device for a trouser waist, characterized in that, it includes a first drawing cylinder structure (1), a second drawing cylinder structure (2), a connecting piece (3), a switching piece (4) and a mounting piece (5); the switching piece (4) is detachably connected to the mounting piece (5); the connecting piece (3) is mounted on the switching piece (4); the first drawing cylinder structure (1) is mounted at one end of the connecting piece (3); the second drawing cylinder structure (2) is mounted at the other end of the connecting piece (3); when the second drawing cylinder structure (2) or the first drawing cylinder structure (1) needs to be used, take out the switching piece (4) from the mounting piece (5) and rotate to switch the second drawing cylinder structure (2) or the first drawing cylinder structure (1); the switching piece (4) includes a switching part (41) and a clamping part (42); the clamping part (42) is mounted on the switching part (41), and the clamping part (42) is located at a position close to the center along the length direction of the switching part (41); the connecting piece (3) is connected to the switching part (41); the mounting piece (5) includes a mounting part (51) and an inserting part (52); the mounting part (51) is evenly provided with mounting holes for connecting to an external sewing machine, the inserting part (52) is mounted on one surface of the mounting part (51), the inserting part (52) is provided with an inserting groove (521), and the inserting groove (521) matches the switching part (41) and the clamping part (42); the switching part (41) is inserted into the inserting groove (521) and gradually extends until the clamping part (42) is completely inserted into the inserting groove (521).

2. The drawing cylinder device for a trouser waist according to claim 1, characterized in that, the connecting piece (3) includes a connecting part (31), a first buckling part (32) and a second buckling part (33); the first buckling parts (32) are mounted on both side surfaces of the connecting part (31), and buckling grooves (321) are provided on the first buckling parts (32); the second drawing cylinder structure (2) and the first drawing cylinder structure (1) are provided with the second buckling parts (33), and the second drawing cylinder structure (2) and the first drawing cylinder structure (1) are both connected to the corresponding first buckling parts (32) through the second buckling parts (33) and the buckling grooves (321).

3. The drawing cylinder device for a trouser waist according to claim 2, characterized in that, a rotating part (34) and a protruding part (35) are provided on the connecting part (31); the rotating part (34) is connected to the protruding part (35), and the rotating part (34) is located on the outer surface of the switching piece (4); the protruding part (35) is located in the two buckling grooves (321); the second buckling part (33) is provided with a groove (331), and the protruding part (35) is connected to the second buckling part (33) through the groove (331).

4. The drawing cylinder device for a trouser waist according to claim 3, characterized in that, The inner thread is provided in the groove (331), and the outer thread is provided on the surface of the convex portion (35). The convex portion (35) is screwed to the second fastening portion (33) through the outer thread and the inner thread.

5. A drawing cylinder device for a trouser waist according to claim 1, characterized in that the mounting member (5) is further provided with a locking member (6); a clamping groove (421) is provided in the clamping portion (42); the locking member (6) is installed outside the inserting portion (52), penetrates through the inserting portion (52) and extends into the inserting groove (521) and is inserted into the clamping groove (421).

6. A drawing cylinder device for a trouser waist according to claim 5, characterized in that at least two locking members (6) are provided, and a linkage member (7) is provided between the locking members (6).

7. A drawing cylinder device for a trouser waist according to claim 2, characterized in that the mounting member (5) further includes a fastening portion (53); the fastening portion (53) is installed at one end of the connecting portion (31) away from the switching member (4).

8. A drawing cylinder device for a trouser waist according to claim 7, characterized in that the fastening portion (53) is provided with a plurality of bends.

9. A sewing machine, characterized in that it includes a drawing cylinder device for a trouser waist according to any one of claims 1-8.

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