Stepping drive sewing machine

Abstract

The utility model provides a stepping drive sewing machine, and relates to the technical field of sewing machines. The stepping driving sewing machine comprises a machine shell, a driving motor, a presser foot lifting mechanism, a thread trimming mechanism and a feed lifting mechanism, a presser foot lifting cam, a feed lifting cam and a thread trimming cam are sequentially arranged on an output shaft of the driving motor, the presser foot lifting cam drives a presser foot lifting connecting rod assembly to drive a presser foot shaft to rotate when rotating, and the presser foot shaft rotates in the forward direction or the reverse direction. The presser foot assembly is driven to be close to or away from the needle plate; the feed lifting mechanism comprises feed dogs, and a feed lifting cam is used for adjusting the height of the feed dogs penetrating out of the needle plate and the gradient of the feed dogs and the surface of the needle plate; the thread trimming cam is used for driving the thread trimming mechanism to cut off thread ends. According to the stepping driving sewing machine, the presser foot lifting mechanism, the thread trimming mechanism and the feed lifting mechanism can be driven to operate at the same time through one driving motor, so that the number of driving parts is reduced, the structure is simpler and more convenient, and assembling is convenient.

Description

Technical Field

[0001] The present application relates to the technical field of sewing machines, and in particular to a stepping-driven sewing machine. Background Art

[0002] During the operation of the sewing machine, multiple mechanisms need to work together, such as the tooth lifting mechanism, the presser foot lifting mechanism and the thread cutting mechanism. These mechanisms coordinate and cooperate to complete the complete sewing function of the sewing machine.

[0003] However, the tooth lifting mechanism, presser foot lifting mechanism and thread trimming mechanism each require a driving component to drive the corresponding mechanism to operate, resulting in a large number of driving components and auxiliary parts, a complex structure, and inconvenience in assembling the sewing machine. Utility Model Content

[0004] The present application provides a stepping drive sewing machine, which is used to solve the problem of excessive number of driving parts and accessory parts in the sewing machine and inconvenient assembly.

[0005] To achieve the above objectives, the present invention provides a stepping drive sewing machine, which adopts the following technical solutions:

[0006] A stepping drive sewing machine comprises a housing, a driving motor, a presser foot lifting mechanism, a thread trimming mechanism and a thread lifting mechanism, wherein the driving motor, the presser foot lifting mechanism, the thread trimming mechanism and the thread lifting mechanism are all arranged on the housing, and the output shaft of the driving motor is sequentially provided with:

[0007] A presser foot lifting cam, wherein the presser foot lifting mechanism includes a presser foot lifting connecting rod assembly, a presser foot shaft and a presser foot assembly, one end of the presser foot shaft is connected to the presser foot assembly, the presser foot shaft rotates forward or reversely to drive the presser foot assembly close to or away from the needle plate, the presser foot lifting connecting rod assembly is arranged between the presser foot shaft and the presser foot lifting cam, and when the presser foot lifting cam rotates, the presser foot lifting connecting rod assembly is driven to rotate the presser foot shaft;

[0008] A tooth lifting cam, wherein the tooth lifting mechanism includes a feed dog, and the tooth lifting cam is used to adjust the height of the feed dog passing through the needle plate, as well as the inclination of the feed dog and the surface of the needle plate;

[0009] The thread trimming cam is used to drive the thread trimming mechanism to cut the thread end.

[0010] In a possible implementation, the presser foot assembly includes a presser foot arm and a presser foot plate, the presser foot plate is connected to the presser foot arm, and one end of the presser foot arm away from the presser foot plate is connected to the presser foot shaft.

[0011] In a possible implementation, the presser foot lifting connecting rod assembly includes:

[0012] A presser foot lifter crank, the presser foot lifter crank being rotatably arranged on the housing of the drive motor, one end of the presser foot lifter crank being connected to a presser foot lifter bearing capable of abutting against the presser foot lifter cam;

[0013] a presser foot lifting rod, one end of which is connected to the other end of the presser foot lifting crank;

[0014] a presser foot lifting connecting rod, one end of which is connected to an end of the presser foot lifting rod away from the presser foot lifting crank, and the other end of which is provided with a hook portion, which is rotatably provided on the presser foot shaft;

[0015] A locking crank is connected to the end of the presser foot shaft, and the locking crank is hooked with the hooking portion.

[0016] In one possible implementation, the presser foot lifting mechanism also includes a presser foot lifting and resetting assembly, which includes a sleeve and a presser foot lifting and resetting member. The sleeve is fixed on the casing, and the presser foot shaft is rotatably arranged in the inner cavity of the sleeve. The presser foot lifting and resetting member is arranged on the sleeve for driving the presser foot shaft to reverse and reset after rotation.

[0017] In one possible implementation, the tooth lifting mechanism includes a drive assembly and a tooth lifting frame, the tooth lifting frame is rotatably connected to the main shaft, the feed dog is connected to one end of the tooth lifting frame, and the drive assembly is arranged at the other end of the tooth lifting frame and drives the tooth lifting frame to rotate on the main shaft.

[0018] In one possible implementation, the driving component includes:

[0019] A tooth lifting shaft and a tooth lifting crank, wherein the tooth lifting shaft is rotatably arranged on the housing, an end of the tooth lifting shaft is connected to the tooth lifting crank, and one end of the tooth lifting crank is connected to the tooth lifting frame and drives the tooth lifting frame to rotate;

[0020] A driving plate, one end of which is fixedly connected to the tooth-elevating shaft, and the other end of which is connected to a tooth-elevating wheel capable of abutting against the tooth-elevating cam.

[0021] In one possible implementation, the tooth lifting mechanism also includes a tooth lifting and resetting component, which includes a tooth lifting sleeve and a tooth lifting and resetting component. The tooth lifting sleeve is fixed on the housing, and the tooth lifting shaft is rotatably arranged in the tooth lifting sleeve. The tooth lifting and resetting component is arranged on the tooth lifting sleeve for driving the rotated tooth lifting shaft to reverse and reset.

[0022] In one possible implementation, the thread cutting mechanism includes a cutter assembly and a cutter connecting rod assembly, the cutter assembly includes a fixed knife and a fixed knife shaft, the fixed knife shaft is rotatably arranged in the housing, the fixed knife is fixedly connected to the end of the fixed knife shaft, and the cutter connecting rod assembly is arranged at the other end of the fixed knife shaft and is used to drive the fixed knife shaft to rotate.

[0023] In one possible implementation, the cutter connecting rod assembly includes a trimmer crank, which is vertically slidably arranged outside the housing, one end of which is hinged to the fixed knife shaft, and a driving member that abuts the trimmer cam is connected to the trimmer crank.

[0024] In a possible implementation, the thread trimming mechanism also includes a limiting assembly, which includes a thread trimming sleeve, a thread trimming crank shaft and an elastic member. The thread trimming sleeve is fixed to the outer wall of the casing, and the thread trimming crank shaft is slidably arranged in the inner cavity of the thread trimming sleeve. One end of the thread trimming crank shaft extending out of the thread trimming sleeve is connected to the thread trimming crank, one end of the elastic member is fixed in the thread trimming sleeve, and the other end of the elastic member abuts against the thread trimming crank shaft.

[0025] A step-driven sewing machine provided in an embodiment of the present application includes a casing, a driving motor, a presser foot lifting mechanism, a thread trimming mechanism and a thread lifting mechanism, and a presser foot lifting cam, a thread trimming cam and a thread lifting cam are sequentially arranged on the output shaft of the driving motor.

[0026] When the output shaft of the driving motor rotates, it drives the presser foot lifting cam, the thread lifting cam and the thread trimming cam to rotate together. When the presser foot lifting cam rotates, the presser foot lifting cam pushes the connecting rod assembly to drive the presser foot shaft to rotate. When the presser foot shaft rotates, it drives the presser foot assembly close to or away from the needle plate, thereby pressing the cloth on the feed cloth to facilitate the transportation of the cloth.

[0027] When the tooth lifting cam rotates, it drives the feed dog to make a circular motion on the needle plate, thereby adjusting the height at which the feed dog passes through the needle plate and the inclination of the feed dog and the needle plate. When the fabric being transported is thicker, the height at which the feed dog passes through the needle plate is increased, and the inclination angle between the feed dog and the needle plate is increased to facilitate the transport of thicker fabrics. When the fabric being transported is thinner, the height at which the feed dog passes through the needle plate is decreased, and the inclination angle between the feed dog and the needle plate is decreased to reduce the possibility of the feed dog penetrating the fabric.

[0028] When the thread trimming cam rotates, the thread trimming cam drives the thread trimming mechanism to cut the thread end at the end of the cloth.

[0029] Compared with the prior art in which the presser foot lifting mechanism, thread trimming mechanism and tooth lifting mechanism require separate driving parts and ancillary connecting parts structures, the stepping sewing machine provided in the embodiment of the present application uses a driving motor to simultaneously drive the presser foot lifting mechanism, thread trimming mechanism and tooth lifting mechanism to operate simultaneously, thereby reducing the number of driving parts, making the structure simpler and easier to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The specific implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiments of the present application, and the embodiments of the present application are not limited to the specific implementation described below.

[0031] Figure 1 This is a schematic diagram showing the overall structure of a stepping drive sewing machine according to an embodiment of the present application;

[0032] Figure 2 This is a schematic diagram showing the internal structure of a stepping drive sewing machine according to an embodiment of the present application;

[0033] Figure 3 This is a schematic diagram showing the exploded structure inside a step-driven sewing machine according to an embodiment of the present application.

[0034] Description of reference numerals:

[0035] 100, housing;

[0036] 200, driving motor; 210, presser foot lifting cam; 220, thread lifting cam; 230, thread trimming cam;

[0037] 300, presser foot lift mechanism; 310, presser foot lift connecting rod assembly; 311, presser foot lift crank; 312, presser foot lift bearing; 313, presser foot lift rod; 314, presser foot lift connecting rod; 315, locking crank; 320, presser foot shaft; 330, presser foot assembly; 331, presser foot arm; 332, presser foot plate; 340, presser foot reset assembly; 341, sleeve; 342, presser foot lift reset member;

[0038] 400, tooth lifting mechanism; 410, drive assembly; 411, tooth lifting shaft; 412, tooth lifting crank; 413, drive plate; 414, tooth lifting wheel; 420, tooth lifting frame; 421, slide; 430, tooth lifting reset assembly; 431, tooth lifting sleeve; 432, tooth lifting reset member;

[0039] 500, thread trimming mechanism; 510, cutter assembly; 511, fixed knife; 512, fixed knife shaft; 520, cutter connecting rod assembly; 521, thread trimmer crank; 522, driving member; 523, rotating shaft; 524, connecting pin; 530, limit assembly; 531, thread trimmer sleeve; 532, thread trimmer crank shaft; 533, elastic member; 534, sealing member;

[0040] 600, spindle; 610, spindle slider;

[0041] 700, feed dog.

[0042] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application and how the technical solutions in the embodiments of the present application solve the above-mentioned technical problems will be clearly and completely described below with specific embodiments and in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0044] In the description of the embodiments of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to a fixed connection, an indirect connection via an intermediate medium, internal communication between two components, or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on specific circumstances.

[0045] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0046] The terms "first," "second," "third," "fourth," and so on (if any) in the description and claims of the embodiments of the present application and in the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in orders other than those illustrated or described herein.

[0047] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0048] In addition, the terms "comprises" and "having" and any variations thereof are intended to cover a non-exclusive inclusion. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, product or apparatus.

[0049] In the prior art, a sewing machine requires multiple mechanisms to work together to complete the sewing work during operation. The presser foot lifting mechanism is used to press the cloth onto the needle plate, thereby facilitating the feed dog to transport the cloth. The tooth lifting mechanism is used to adjust the height of the feed dog passing through the needle plate, as well as the inclination of the feed dog and the needle plate surface, thereby facilitating the transportation of cloths of different thicknesses. The thread trimming mechanism is used to cut the thread ends or the cloth body of the cloth.

[0050] However, the tooth lifting mechanism, presser foot lifting mechanism and thread trimming mechanism each require a driving component to drive the corresponding mechanism to operate during operation, resulting in a large number of driving components and auxiliary parts, a complex structure, and inconvenience in assembling the sewing machine.

[0051] Based on this, an embodiment of the present application provides a stepping-driven sewing machine, including a casing, a driving motor, a presser foot lifting mechanism, a thread trimming mechanism and a tooth lifting mechanism, and the output shaft of the driving motor is sequentially provided with: a presser foot lifting cam, a tooth lifting cam and a thread trimming cam.

[0052] When the output shaft of the driving motor rotates, the presser foot lifting cam, the tooth lifting cam and the thread trimming cam are driven to rotate together.

[0053] When the presser foot lifting cam rotates, the presser foot lifting cam pushes the connecting rod assembly to drive the presser foot shaft to rotate. When the presser foot shaft rotates, the presser foot assembly is driven closer to or away from the needle plate, thereby pressing the cloth on the feed cloth to facilitate the transportation of the cloth.

[0054] When the tooth lifting cam rotates, it drives the feed dog to make a circular motion on the needle plate, thereby adjusting the height at which the feed dog passes through the needle plate and the inclination of the feed dog and the needle plate. When the fabric being transported is thicker, the height at which the feed dog passes through the needle plate is increased, and the inclination angle between the feed dog and the needle plate is increased to facilitate the transport of thicker fabrics. When the fabric being transported is thinner, the height at which the feed dog passes through the needle plate is decreased, and the inclination angle between the feed dog and the needle plate is decreased to reduce the possibility of the feed dog penetrating the fabric.

[0055] When the thread trimming cam rotates, the thread trimming cam drives the thread trimming mechanism to cut the thread end at the end of the cloth.

[0056] Compared with the prior art in which the presser foot lifting mechanism, thread trimming mechanism and tooth lifting mechanism require separate driving parts and ancillary connecting parts structures, the stepper-driven sewing machine provided in the embodiment of the present application uses a driving motor to simultaneously drive the presser foot lifting mechanism, thread trimming mechanism and tooth lifting mechanism to operate simultaneously, thereby reducing the number of driving parts, making the structure simpler and easier to assemble.

[0057] The following detailed description of the technical solutions of the embodiments of the present application is given with reference to the accompanying drawings. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0058] like Figures 1 to 3 As shown, the embodiment of the present application provides a stepping drive sewing machine, including a housing 100, a driving motor 200, a presser foot lifting mechanism 300, a thread trimming mechanism 500 and a tooth lifting mechanism 400, wherein the driving motor 200, the presser foot lifting mechanism 300, the thread trimming mechanism 500 and the tooth lifting mechanism 400 are all arranged on the housing 100, and the output shaft of the driving motor 200 is sequentially provided with:

[0059] The presser foot lifting cam 210, the presser foot lifting mechanism 300 includes a presser foot lifting connecting rod assembly 310, a presser foot shaft 320 and a presser foot assembly 330. One end of the presser foot shaft 320 is connected to the presser foot assembly 330. The presser foot shaft 320 rotates forward or reverse to drive the presser foot assembly 330 to move closer to or away from the needle plate. The presser foot lifting connecting rod assembly 310 is arranged between the presser foot shaft 320 and the presser foot lifting cam 210. When the presser foot lifting cam 210 rotates, it drives the presser foot lifting connecting rod assembly 310 to drive the presser foot shaft 320 to rotate.

[0060] The tooth lifting cam 220, the tooth lifting mechanism 400 includes a feed dog 700, and the tooth lifting cam 220 is used to adjust the height of the feed dog 700 passing through the needle plate, as well as the inclination of the feed dog 700 and the needle plate surface.

[0061] The thread trimming cam 230 is used to drive the thread trimming mechanism 500 to cut the thread end.

[0062] In the embodiment of the present application, when the output shaft of the drive motor 200 rotates, it drives the presser foot lifting cam 210, the thread lifting cam 220, and the thread trimming cam 230 to rotate together. When the presser foot lifting cam 210 rotates, the presser foot lifting cam 210 pushes the connecting rod assembly to rotate the presser foot shaft 320. When the presser foot shaft 320 rotates, it drives the presser foot assembly 330 toward or away from the needle plate, thereby pressing the fabric piece onto the thread feed cloth to facilitate the transportation of the fabric piece.

[0063] When the feed dog lifting cam 220 rotates, it drives the feed dog 700 to perform a circular motion on the needle plate, thereby adjusting the height at which the feed dog 700 passes through the needle plate and the inclination of the feed dog 700 with respect to the needle plate. When transporting thicker fabrics, the height at which the feed dog 700 passes through the needle plate is increased, and the inclination angle between the feed dog 700 and the needle plate is increased to facilitate the transport of thicker fabrics. When transporting thinner fabrics, the height at which the feed dog 700 passes through the needle plate and the inclination angle between the feed dog 700 and the needle plate are decreased to reduce the possibility of the feed dog 700 penetrating the fabric.

[0064] When the thread trimming cam 230 rotates, the thread trimming cam 230 drives the thread trimming mechanism 500 to cut the thread ends of the cloth or the cloth body.

[0065] Compared with the prior art in which the presser foot lifting mechanism 300, the thread trimming mechanism 500 and the tooth lifting mechanism 400 require separate driving parts 522 and an auxiliary connecting part structure, the stepper-driven sewing machine provided in the embodiment of the present application uses a driving motor 200 to simultaneously drive the presser foot lifting mechanism 300, the thread trimming mechanism 500 and the tooth lifting mechanism 400 to operate, reducing the number of motors in the sewing machine, making the structure of the sewing machine simpler, and at the same time reducing the number of auxiliary parts that need to be used in conjunction with multiple motors, thereby improving the assembly efficiency of the sewing machine.

[0066] Reference Figure 2 and Figure 3 In one possible implementation, the presser foot assembly 330 includes a presser foot arm 331 and a presser foot plate 332 , the presser foot plate 332 is connected to the presser foot arm 331 , and one end of the presser foot arm 331 away from the presser foot plate 332 is connected to the presser foot shaft 320 .

[0067] Specifically, in the present embodiment, the presser arm 331 is fixed to the presser plate 332 by bolts. One end of the presser arm 331 away from the presser plate 332 is provided with a slot, and one end of the presser shaft 320 is inserted into the slot and fixed to the end of the presser plate 332 by a latch.

[0068] It is understood that when the presser foot shaft 320 rotates along its own axis, it drives the presser foot arm 331 to perform a circular motion with the presser foot shaft 320 as the center, thereby driving the presser foot plate 332 to move toward the needle plate to apply friction to the fabric, thereby facilitating the movement of the fabric. Alternatively, it drives the presser foot plate 332 away from the needle plate, thereby facilitating the replacement of the fabric.

[0069] Reference Figure 2 and Figure 3 In one possible implementation, the presser foot lifting link assembly 310 includes:

[0070] The presser foot lifting crank 311 is rotatably arranged on the housing of the driving motor 200 , and one end of the presser foot lifting crank 311 is connected to a presser foot lifting bearing 312 that can abut against the presser foot lifting cam 210 .

[0071] The presser foot lifting rod 313 has one end connected to the other end of the presser foot lifting crank 311 .

[0072] The presser foot lifting connecting rod 314 has one end connected to the end of the presser foot lifting rod 313 away from the presser foot lifting crank 311, and the other end of the presser foot lifting connecting rod 314 is provided with a hook portion, which is rotatably provided on the presser foot shaft 320.

[0073] The locking crank 315 is connected to the end of the presser foot shaft 320, and the locking crank 315 is hooked with the hook portion.

[0074] Specifically, the presser foot lift crank 311 includes two crank rods, the ends of which are integrally formed. The angle between the two crank rods is approximately 90 degrees, and the specific angle can be changed according to actual conditions. The connecting portion of the two crank rods is rotatably connected to the housing 100 via a screw. A screw is inserted into the end of one of the crank rods, and the screw passes through one end of the crank rod and is threadedly connected to a nut. The presser foot lift bearing 312 is sleeved on the screw.

[0075] The end of the other crank rod is in contact with the end of the presser foot lifting rod 313 and is penetrated by the same screw. The end of the presser foot lifting rod 313 away from the presser foot lifting crank 311 is fixed to one end of the presser foot lifting connecting rod 314 by the cooperation of a screw and a nut. The end of the presser foot lifting connecting rod 314 away from the presser foot lifting rod 313 is sleeved on the presser foot shaft 320, and a hook portion is integrally formed on the end of the presser foot lifting rod 313. The locking crank 315 is fixed to the end of the presser foot shaft 320, and a hook block is integrally formed on the locking crank 315 to engage with the hook portion.

[0076] It can be understood that when the presser foot lifting cam 210 rotates following the output shaft of the drive motor 200, the presser foot lifting cam 210 squeezes the presser foot lifting bearing 312, causing the foot lifting crank to rotate, thereby driving the presser foot lifting rod 313 to move downward in the vertical direction, pulling the presser foot lifting connecting rod 314 to rotate on the presser foot shaft 320, the hooking part hooks with the hooking block and drives the locking crank 315 and the presser foot shaft 320 to rotate together, thereby driving the presser foot plate 332 away from the needle plate.

[0077] Reference Figure 2 and Figure 3In one possible implementation, the presser foot lifting mechanism 300 also includes a presser foot lifting and resetting assembly 340. The presser foot lifting and resetting assembly 340 includes a sleeve 341 and a presser foot lifting and resetting member 342. The sleeve 341 is fixed on the casing 100. The presser foot shaft 320 is rotatably set in the inner cavity of the sleeve 341. The presser foot lifting and resetting member 342 is set on the sleeve 341 and is used to drive the rotated presser foot shaft 320 to reverse and reset.

[0078] Specifically, the presser foot lifter reset member 342 is a torsion spring, which is sleeved on the sleeve 341 , with one end of the torsion spring pressed against the housing 100 , and the other end of the torsion spring pressed against the presser foot lifter connecting rod 314 .

[0079] The lock pin 314 is engaged with the lock pin 316 and the spring 317 is engaged with the lock pin 318. When the lock pin 316 is engaged, the lock pin 316 is engaged with the lock pin 318. As shown in FIG31 , the lock pin 316 is engaged with the lock pin 318.

[0080] Reference Figure 2 and Figure 3 In one possible implementation, the tooth lifting mechanism 400 includes a drive assembly 410 and a tooth lifting frame 420. The tooth lifting frame 420 is rotatably connected to the main shaft 600, the feed dog 700 is connected to one end of the tooth lifting frame 420, and the drive assembly 410 is arranged at the other end of the tooth lifting frame 420 for driving the tooth lifting frame 420 to rotate on the main shaft 600.

[0081] Specifically, a spindle slider 610 is sleeved and fixedly connected to the spindle 600, a slide groove 421 is opened on the tooth lifting frame 420, the spindle slider 610 is slidably set in the slide groove 421, and the top and bottom of the spindle slider 610 are respectively abutted against the top wall and bottom wall of the slide groove 421.

[0082] It can be understood that when the drive assembly 410 drives the tooth lifting frame 420 to rotate on the main shaft 600, the tooth lifting frame 420 will generate component forces in the horizontal and vertical directions. When the tooth lifting frame 420 moves in the horizontal direction, the main shaft slider 610 moves in the slide groove 421, and the component force on the tooth lifting frame 420 in the vertical direction will drive the tooth lifting frame 420 to rotate around the main shaft 600, and the feed dog 700 will follow the end of the tooth lifting frame 420 to perform circular motion, thereby controlling the height of the feed dog 700 in the vertical direction, and realizing the height adjustment function of the feed dog 700 passing through the needle plate. Since the feed dog 700 is performing circular motion, the feed dog 700 and the tooth lifting frame 420 are always kept perpendicular, so the inclination of the feed dog 700 and the needle plate will also change accordingly.

[0083] Reference Figure 2 and Figure 3 In one possible implementation, the driving component 410 includes:

[0084] The tooth lifting shaft 411 and the tooth lifting crank 412 are rotatably arranged on the housing 100, the end of the tooth lifting shaft 411 is connected to the tooth lifting crank 412, and one end of the tooth lifting crank 412 is connected to the tooth lifting frame 420 and drives the tooth lifting frame 420 to rotate.

[0085] The driving plate 413 has one end fixedly connected to the tooth lifting shaft 411 , and the other end of the driving plate 413 is connected to a tooth lifting wheel 414 that can abut against the tooth lifting cam 220 .

[0086] It can be understood that when the tooth lifting cam 220 rotates, the tooth lifting cam 220 squeezes the tooth lifting wheel 414, causing one end of the driving plate 413 to displace, thereby driving the other end of the driving plate 413 to rotate along the axis of the tooth lifting shaft 411. When the tooth lifting shaft 411 rotates, it drives the tooth lifting crank 412 to rotate synchronously, thereby causing the tooth lifting frame 420 to perform circular motion with the tooth lifting shaft 411 as the center.

[0087] Reference Figure 2 and Figure 3 In one possible implementation, the tooth lifting mechanism 400 also includes a tooth lifting and resetting component 430, which includes a tooth lifting sleeve 431 and a tooth lifting and resetting component 432. The tooth lifting sleeve 431 is fixed on the housing 100, and the tooth lifting shaft 411 is rotatably set in the tooth lifting sleeve 431. The tooth lifting and resetting component 432 is set on the tooth lifting sleeve 431, and is used to drive the rotated tooth lifting shaft 411 to reverse and reset.

[0088] Specifically, the tooth lifting and resetting member 432 is a torsion spring, one end of which abuts against the housing 100 , and the other end of which is fixed to the driving plate 413 .

[0089] When the driving plate 413 rotates, the driving plate 413 applies a thrust to the torsion spring, causing the torsion spring to undergo elastic deformation. When the tooth lifting cam 220 separates from the tooth lifting wheel 414, the torsion spring undergoes elastic deformation and drives the driving plate 413 to rotate in the opposite direction to the initial position. When the driving plate 413 rotates in the opposite direction, it drives the tooth lifting shaft 411 to move in the opposite direction, thereby causing the tooth lifting frame 420 to perform a reverse circular motion on the main shaft 600, so that the tooth lifting frame 420 and the feed dog 700 are reset.

[0090] Reference Figure 2 and Figure 3 In one possible implementation, the thread cutting mechanism 500 includes a cutter assembly 510 and a cutter connecting rod assembly 520. The cutter assembly 510 includes a fixed knife 511 and a fixed knife shaft 512. The fixed knife shaft 512 is rotatably arranged in the housing 100. The fixed knife 511 is fixedly connected to the end of the fixed knife shaft 512. The cutter connecting rod assembly 520 is arranged at the other end of the fixed knife shaft 512 and is used to drive the fixed knife shaft 512 to rotate.

[0091] It is understandable that when the cutter link assembly 520 drives the fixed knife shaft 512 to rotate, the fixed knife 511 can cut the cloth.

[0092] In one possible implementation, the cutter connecting rod assembly 520 includes a trimmer crank 521, which is vertically slidably arranged outside the housing 100, one end of the trimmer crank 521 is hinged to the fixed knife shaft 512, and the trimmer crank 521 is connected to a driving member 522 that abuts against the trimmer cam 230.

[0093] Specifically, the end of the fixed blade shaft 512 is fixedly connected to a rotating shaft 523, and a connecting pin 524 is provided on the rotating shaft 523. The trimmer crank 521 is connected to the connecting pin 524. In this embodiment, the driving member 522 is a driving ball, and the driving ball is penetrated by a screw fixed to the side wall of the trimmer crank 521.

[0094] It can be understood that when the thread trimming cam 230 rotates, it pushes the driving member 522 to move vertically upward along the height direction of the casing 100, and the driving member 522 drives the thread trimming crank 521 to move vertically upward, and the thread trimming crank 521 thereby drives the connecting pin 524 to move vertically. When the connecting pin 524 moves, it drives the rotating shaft 523 to rotate with the fixed knife shaft 512 as the axis, so that the fixed knife shaft 512 rotates in the casing 100, driving the fixed knife 511 to perform cutting.

[0095] Reference Figure 2 and Figure 3In a possible implementation, the thread trimming mechanism 500 further includes a limiting assembly 530, which includes a thread trimming sleeve 531, a thread trimming crank shaft 532 and an elastic member 533. The thread trimming sleeve 531 is fixed to the outer wall of the housing 100, and the thread trimming crank shaft 532 is slidably arranged in the inner cavity of the thread trimming sleeve 531. One end of the thread trimming crank shaft 532 extending out of the thread trimming sleeve 531 is connected to the thread trimming crank 521, one end of the elastic member 533 is fixed in the thread trimming sleeve 531, and the other end of the elastic member 533 abuts against the thread trimming crank shaft 532.

[0096] Specifically, the sidewall of the thread trimmer sleeve 531 is fixed to the housing 100. A seal 534 is connected to one end of the thread trimmer sleeve 531 to seal the opening at one end. In this embodiment, the seal 534 is a pressure-adjusting screw. An elastic member 533 is positioned between the seal 534 and the thread trimmer crankshaft 532. One end of the elastic member 533 abuts against the seal 534, while the other end of the elastic member 533 abuts against the thread trimmer crankshaft 532.

[0097] It can be understood that when the driving member 522 is pushed by the thread trimming cam 230, the thread trimming crank 521 pushes the thread trimming crank shaft 532 to squeeze the elastic member 533, so that the elastic member 533 shrinks in the thread trimming shaft sleeve 531, and the thread trimming shaft sleeve 531 limits the moving direction of the thread trimming crank shaft 532, thereby reducing the deviation of the thread trimming crank 521 during movement.

[0098] When the driving member 522 is separated from the thread trimming crank 521, the elastic member 533 undergoes elastic deformation to push the thread trimming crank shaft 532 to move, thereby restoring the thread trimming crank 521 to its initial position. When the thread trimming crank 521 moves, it drives the rotating shaft 523 to rotate in the opposite direction, causing the fixed knife 511 to move away from the needle plate.

[0099] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

[0100] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A stepping drive sewing machine, characterized in that: The invention comprises a housing (100), a driving motor (200), a presser foot lifting mechanism (300), a thread trimming mechanism (500) and a tooth lifting mechanism (400), wherein the driving motor (200), the presser foot lifting mechanism (300), the thread trimming mechanism (500) and the tooth lifting mechanism (400) are all arranged on the housing (100), and the output shaft of the driving motor (200) is provided with: A presser foot lifting cam (210), the presser foot lifting mechanism (300) comprises a presser foot lifting connecting rod assembly (310), a presser foot shaft (320) and a presser foot assembly (330), one end of the presser foot shaft (320) is connected to the presser foot assembly (330), the presser foot shaft (320) rotates in a forward or reverse direction to drive the presser foot assembly (330) to approach or move away from the needle plate, the presser foot lifting connecting rod assembly (310) is arranged between the presser foot shaft (320) and the presser foot lifting cam (210), and when the presser foot lifting cam (210) rotates, the presser foot lifting connecting rod assembly (310) is driven to drive the presser foot shaft (320) to rotate; A tooth-lifting cam (220), wherein the tooth-lifting mechanism (400) includes a feed tooth (700), and the tooth-lifting cam (220) is used to adjust the height of the feed tooth (700) passing through the needle plate, and the inclination of the feed tooth (700) and the surface of the needle plate; A thread trimming cam (230) is used to drive the thread trimming mechanism (500) to trim the thread ends.

2. The stepping drive sewing machine according to claim 1, characterized in that: The presser foot assembly (330) comprises a presser foot arm (331) and a presser foot plate (332), wherein the presser foot plate (332) is connected to the presser foot arm (331), and one end of the presser foot arm (331) away from the presser foot plate (332) is connected to the presser foot shaft (320).

3. The stepping drive sewing machine according to claim 2, characterized in that: The presser foot lifting connecting rod assembly (310) comprises: a presser foot lifting crank (311), the presser foot lifting crank (311) being rotatably arranged on the housing of the driving motor (200), and one end of the presser foot lifting crank (311) being connected to a presser foot lifting bearing (312) capable of abutting against the presser foot lifting cam (210); A presser foot lifting rod (313), one end of which is connected to the other end of the presser foot lifting crank (311); A presser foot lifting connecting rod (314), one end of which is connected to an end of the presser foot lifting rod (313) away from the presser foot lifting crank (311), and the other end of the presser foot lifting connecting rod (314) is provided with a hook portion, which is rotatably provided on the presser foot shaft (320); A locking crank (315), wherein the locking crank (315) is connected to the end of the presser foot shaft (320), and the locking crank (315) is hooked with the hooking portion.

4. The stepping drive sewing machine according to claim 3, characterized in that: The presser foot lifting mechanism (300) further comprises a presser foot lifting and resetting assembly (340), the presser foot lifting and resetting assembly (340) comprising a sleeve (341) and a presser foot lifting and resetting member (342), the sleeve (341) being fixed on the housing (100), the presser foot shaft (320) being rotatably arranged in the inner cavity of the sleeve (341), and the presser foot lifting and resetting member (342) being arranged on the sleeve (341) and being used for driving the rotated presser foot shaft (320) to reverse and reset.

5. The stepping drive sewing machine according to any one of claims 1 to 4, characterized in that: The tooth lifting mechanism (400) includes a driving assembly (410) and a tooth lifting frame (420), wherein the tooth lifting frame (420) is rotatably connected to a main shaft (600), the feed dog (700) is connected to one end of the tooth lifting frame (420), and the driving assembly (410) is arranged at the other end of the tooth lifting frame (420) and drives the tooth lifting frame (420) to rotate on the main shaft (600).

6. The stepping drive sewing machine according to claim 5, characterized in that: The drive assembly (410) comprises: A tooth-lifting shaft (411) and a tooth-lifting crank (412), wherein the tooth-lifting shaft (411) is rotatably arranged on the housing (100), an end of the tooth-lifting shaft (411) is connected to the tooth-lifting crank (412), and one end of the tooth-lifting crank (412) is connected to the tooth-lifting frame (420) and drives the tooth-lifting frame (420) to rotate; A driving plate (413), one end of which is fixedly connected to the tooth-lifting shaft (411), and the other end of which is connected to a tooth-lifting wheel (414) capable of abutting against the tooth-lifting cam (220).

7. The stepping drive sewing machine according to claim 6, characterized in that: The tooth-lifting mechanism (400) further includes a tooth-lifting and resetting assembly (430), which includes a tooth-lifting sleeve (431) and a tooth-lifting and resetting member (432). The tooth-lifting sleeve (431) is fixed on the housing (100), and the tooth-lifting shaft (411) is rotatably arranged in the tooth-lifting sleeve (431). The tooth-lifting and resetting member (432) is arranged on the tooth-lifting sleeve (431) and is used to drive the rotated tooth-lifting shaft (411) to reverse and reset.

8. The stepping drive sewing machine according to any one of claims 1 to 4, characterized in that: The thread cutting mechanism (500) comprises a cutter assembly (510) and a cutter connecting rod assembly (520); the cutter assembly (510) comprises a fixed knife (511) and a fixed knife shaft (512); the fixed knife shaft (512) is rotatably arranged in the housing (100); the fixed knife (511) is fixedly connected to the end of the fixed knife shaft (512); the cutter connecting rod assembly (520) is arranged at the other end of the fixed knife shaft (512) and is used to drive the fixed knife shaft (512) to rotate.

9. The stepping drive sewing machine according to claim 8, characterized in that: The cutter connecting rod assembly (520) includes a trimmer crank (521), which is vertically slidably arranged outside the housing (100), one end of which is hinged to the fixed knife shaft (512), and a driving member (522) is connected to the trimmer crank (521) and abuts against the trimmer cam (230).

10. The stepping drive sewing machine according to claim 9, characterized in that: The thread trimming mechanism (500) further includes a position limiting assembly (530), the position limiting assembly (530) including a thread trimming sleeve (531), a thread trimming crank shaft (532) and an elastic member (533), the thread trimming sleeve (531) being fixed to the outer wall of the housing (100), the thread trimming crank shaft (532) being slidably arranged in the inner cavity of the thread trimming sleeve (531), one end of the thread trimming crank shaft (532) extending out of the thread trimming sleeve (531) being connected to the thread trimming crank (521), one end of the elastic member (533) being fixed in the thread trimming sleeve (531), and the other end of the elastic member (533) being in contact with the thread trimming crank shaft (532).

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