CN113430726A - Driving mechanism of sewing machine - Google Patents

Abstract

The application provides a sewing machine's actuating mechanism, concretely relates to sewing machine makes technical field. Aiming at the technical problems of complex structure and the guarantee of a lubricating system of the existing sewing machine, the cloth feeding tooth driving mechanism of the sewing machine with simple structure and no need of lubrication is realized, so as to overcome the defects, the cloth feeding tooth driving mechanism of the sewing machine is provided with an upper shaft motor, an upper shaft, a lower shaft, a tooth lifting shaft and a cloth feeding tooth, wherein the upper shaft is driven by the upper shaft motor, and the cloth feeding tooth driving mechanism is characterized in that no cam is arranged on the upper shaft, the lower shaft is driven by a rotating shuttle motor, the tooth lifting shaft is driven by the tooth lifting motor, and the cloth feeding shaft is driven by the cloth feeding motor. The arrangement of no cam on the upper shaft breaks through the design concept of the traditional sewing machine, and simultaneously, a cloth feeding connecting rod and a feed lifting connecting rod which are connected by the cam and driven are eliminated, so that the cost of the sewing machine is reduced in manufacturing, and a lubricating system is not needed for lubricating a transmission piece; the traditional part of the swinging seat is removed, and the sewing machine can also have the functions of the swinging seat completely, so that the sewing machine has higher popularization and use values.

Description

Driving mechanism of sewing machine

Technical Field

The application provides a sewing machine's actuating mechanism, concretely relates to sewing machine makes technical field.

Background

In a driving mechanism of the sewing machine, a main motor is arranged on a machine head of the sewing machine and is connected with an output main shaft, an eccentric wheel is fixedly arranged on the output main shaft, and the main motor rotates to drive a cloth feeding connecting rod and a feed lifting connecting rod to move. The cloth feeding connecting rod drives the cloth feeding shaft to rotate at a certain angle through the swinging seat component, and the feed lifting connecting rod drives the feed lifting rock shaft to swing at a certain angle through the feed lifting rock crank; the swing of the cloth feeding connecting rod and the cloth feeding shaft drives the cloth feeding tooth rack to swing so as to generate back-and-forth motion for the cloth feeding tooth; the feed dog connecting rod and the feed dog shaft swing to drive the feed dog fork on the feed dog shaft to swing so as to enable the feed dog to move up and down, and the forward and backward movement and the up and down movement are combined to form the feed action of the feed dog.

Aiming at a swinging seat for controlling the needle pitch, a plurality of enterprises put forward an intelligent control technical scheme for realizing the cloth feeding needle pitch. The cloth feeding device is characterized by further comprising a swing rod, the cloth feeding shaft driving source is provided with an output shaft, the swing rod is mounted on the output shaft, the swing rod is connected with the crank through a hinge, the connecting crank is fixed on the cloth feeding shaft, the cloth feeding shaft is movably connected with the cloth feeding tooth rack, and the cloth feeding tooth rack is fixedly provided with the cloth feeding tooth. In fact, the proposal utilizes the cloth feeding shaft driving source to drive the swing rod to replace a cloth feeding connecting rod of the original sewing machine, carries out the stitch length adjustment on the stitch length adjusting mechanism and positions the zero point position of the cloth feeding teeth on the zero position positioning mechanism, and achieves the positive stitch length adjusting technical effect. However, the movement of the feed lifting connecting rod still remains in the prior art, so that the cloth feeding action of the feed dog cannot reach the intelligent control level.

In addition, a bevel gear is fixedly arranged on an output main shaft of the sewing machine, the bevel gear on a vertical shaft is meshed with the bevel gear, the vertical shaft is meshed with the bevel gear of a lower shaft, and a rotating shuttle is fixedly arranged at the tail end of the lower shaft. The lower shaft is driven to rotate by the vertical shaft under the driving of the main motor, and the power for the rotating shuttle to run is provided. Here, the transmission ratio of the lower shaft to the main shaft is generally set to 1: 2, thereby forming a unique technique of two rotations of the rotating shuttle once for the needle-punching of the sewing machine. However, these most common components, including the aforementioned swing seat, are easily worn and require the maintenance of the lubrication system of the sewing machine, still generate high noise during operation, and require frequent maintenance and replacement; in addition, the lower shaft and the vertical shaft are longer, so that the manufacturing and assembling links are more complicated and complicated, and the manufacturing cost is higher.

Disclosure of Invention

Aiming at the technical problems of complex structure and the guarantee of a lubricating system of the existing sewing machine, the cloth feeding tooth driving mechanism of the sewing machine with simple structure and no need of lubrication is realized, so as to overcome the defects, the cloth feeding tooth driving mechanism of the sewing machine is provided with an upper shaft motor, an upper shaft, a lower shaft, a tooth lifting shaft and a cloth feeding tooth, wherein the upper shaft is driven by the upper shaft motor, and the cloth feeding tooth driving mechanism is characterized in that no cam is arranged on the upper shaft, the lower shaft is driven by a rotating shuttle motor, the tooth lifting shaft is driven by the tooth lifting motor, and the cloth feeding shaft is driven by the cloth feeding motor.

Preferably, the upper shaft motor is mounted on one side of the upper shaft near the needle shaft or in the middle or rear position.

Preferably, the rear part of the upper shaft motor is also provided with a fan, the rear part of the upper shaft motor is also connected with a connecting rod, the connecting rod and the upper shaft run synchronously, and the tail end of the connecting rod is fixedly connected with a hand wheel for adjusting the position of the needle rod.

Preferably, the connecting rod has a smaller diameter than the upper shaft.

Preferably, the rotating shuttle motor drives the lower shaft to realize that the rotating shuttle connected with the lower shaft performs the wire take-up and hooking actions, and the rotating shuttle motor is fixedly arranged between the cloth feeding motor and the tooth lifting motor.

Preferably, the feed lifting shaft is connected to an output shaft of the feed lifting motor, or the feed lifting shaft and the output shaft of the feed lifting motor are integrated, a tooth frame seat is mounted at the front end of the feed lifting shaft, the tooth frame seat is connected with a tooth frame, a feed dog is fixed on the tooth frame, and the tooth frame seat and the tooth frame transmit up-and-down swinging motion to the tooth frame under the driving of the feed lifting motor in a repeated back-and-forth swinging operation mode, so that the feed dog has up-and-down swinging motion.

Preferably, the cloth feeding shaft is connected to an output shaft of the cloth feeding motor, or the cloth feeding shaft and the output shaft of the cloth feeding motor are integrated, a feed lifting fork-shaped crank is mounted at the front end of the cloth feeding shaft, and the feed lifting fork-shaped crank transmits a front-back swinging motion to the tooth frame under the driving of the cloth feeding motor in a repeated back-and-forth swinging operation mode, so that the cloth feeding tooth has the front-back swinging motion.

Preferably, the cloth feeding motor and the tooth lifting motor are fixedly arranged below the base plate, and the cloth feeding motor and the tooth lifting motor are positioned on two sides of the base plate.

Preferably, the cloth feeding motor, the feed lifting motor and the rotary shuttle motor are installed at one side of the rotary shuttle close to the sewing machine.

Preferably, the sewing machine is further provided with a presser foot lifting assembly and a thread trimming assembly, the presser foot lifting assembly is provided with a thread trimming and presser foot lifting motor, a presser foot lifting cam, a presser foot lifting ejector rod and a presser foot lifting execution end, the presser foot lifting cam is provided with a presser foot lifting cam lifting surface and an idle circular arc surface, the presser foot lifting cam is fixed on an output shaft of the thread trimming and presser foot lifting motor, the presser foot lifting cam lifting surface is used for adjusting the presser foot lifting ejector rod to be at a higher or lower position at a lower or higher position, the idle circular arc surface is used for idle rotation between the presser foot lifting ejector rod and the presser foot lifting cam, the idle circular arc surface and the output shaft of the thread trimming and presser foot lifting motor are arranged concentrically, and the presser foot lifting cam lifting surface is positioned at a cam part of the presser foot lifting cam;

the thread trimming component is provided with a thread trimming and presser foot lifting motor, a thread trimming crank, a thread trimming fork wheel and a thread trimming execution end, the thread trimming crank is provided with a pushing piece, the pushing piece is arranged at the eccentric position of the thread trimming crank and pushes the thread trimming fork wheel to perform thread trimming action, the thread trimming fork wheel is provided with a return rod and a thread trimming rod, the pushing piece is positioned between the return rod and the thread trimming rod, and the pushing piece pushes the thread trimming rod to enable the thread trimming execution end to execute the thread trimming action under the condition that the thread trimming and presser foot lifting motor drives the thread trimming crank;

after the thread trimming action is finished, the presser foot lifting cam starts to perform the presser foot lifting action, the rotation angle of the thread trimming and presser foot lifting motor does not enable the presser foot lifting cam to generate actual presser foot lifting action on the presser foot lifting ejector rod during the thread trimming action, the presser foot lifting ejector rod and the idle circular arc surface are in idle rotation, the thread trimming and presser foot lifting motor drives the presser foot lifting cam lifting surface of the presser foot lifting cam to lift the presser foot lifting ejector rod, the presser foot lifting ejector rod is lifted to the highest point when the highest point of the presser foot lifting ejector rod is reached, and the presser foot lifting execution end completes the presser foot lifting action;

in the presser foot lifting process, the pushing piece pushes the return rod, so that the pushing piece pushes the return rod to the original position, the whole thread cutting assembly is reset, the thread cutting assembly can be effectively and directly returned to the original position in the fault state of clamping, and the resetting function is realized;

when the presser foot is to be lowered, the trimming and presser foot lifting motor returns the presser foot lifting ejector rod to the idle running arc surface from the presser foot lifting cam lifting surface under the action of the clockwise force, so that the action of lowering the presser foot is realized.

Compared with the prior art, the beneficial effects of this application are: the upper shaft of the sewing machine is not provided with the cam, so that the lower shaft is driven by the rotating shuttle motor, the feed lifting tooth shaft is driven by the feed lifting tooth motor, and the feed feeding shaft is driven by the feed feeding motor. The arrangement of no cam on the upper shaft breaks through the design concept of the traditional sewing machine, and simultaneously, the cloth feeding connecting rod and the feed lifting connecting rod which are connected and driven by the cam are eliminated, so that the manufacturing cost of the sewing machine is reduced, a lubricating system is not needed to lubricate a transmission piece, in addition, the traditional part of the swinging seat is removed, the sewing machine can also completely have the functions of the swinging seat, and the sewing machine has higher popularization and use values.

Drawings

FIG. 1 is a schematic view of a drive mechanism of a sewing machine;

FIG. 2 is a schematic view of a lower thread driving mechanism, an upper thread driving mechanism and a rotating shuttle driving assembly of a driving mechanism of a sewing machine;

FIG. 3 is a schematic view of a cloth feed drive assembly of a drive mechanism of a sewing machine;

FIG. 4 is a schematic view of a thread trimming and presser foot lifting drive mechanism of a sewing machine;

FIG. 5 shows another schematic view of a thread trimming and presser foot lifting drive mechanism of a drive mechanism for a sewing machine.

Marking: the cloth feeding device comprises a cloth feeding motor 11, a cloth feeding shaft 111, a feed lifting fork-shaped crank 112, a feed lifting motor 21, a feed lifting shaft 211, a tooth rack seat 212, a tooth rack 213, a feed lifting tooth 214, a rotating shuttle motor 31, a lower shaft 311, a rotating shuttle 312, an upper shaft motor 41, an upper shaft 411, a transmission piece 412, a needle rod 413, a fan 414, a hand wheel 415, a connecting rod 416, a needle plate 51, a thread cutting and presser foot lifting motor 61, a thread cutting crank 71, a pushing piece 711, a thread cutting fork wheel 72, a thread cutting rod 721, a return rod 722, a thread cutting execution end 73, a presser lifting cam 74, a presser lifting surface 741 of the presser foot lifting cam, an arc surface 742, a presser lifting pin ejector 75, a presser foot execution end 76 and a base plate 81.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to fig. 1-5, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application will be clearly and clearly defined, and these embodiments are only for illustrating the present invention and are not limited thereto.

The application provides a driving mechanism of a sewing machine, and the sewing machine is provided with a bottom thread driving mechanism, an upper thread driving mechanism, a thread cutting and presser foot lifting driving mechanism and a control system. The bottom line driving mechanism is provided with a cloth feeding driving component and a rotating shuttle driving component, wherein the cloth feeding driving component mainly comprises a cloth feeding motor 11, a feed lifting tooth motor 21, a cloth feeding shaft 111, a feed lifting tooth shaft 211 and a feed lifting tooth 214; the rotary shuttle driving assembly has a rotary shuttle motor 31, a lower shaft 311, and a rotary shuttle 312. The cloth feeding driving component drives the cloth feeding shaft 111 by the cloth feeding motor 11, and the feed lifting tooth motor 21 drives the feed lifting tooth shaft 211 to indirectly realize the cloth feeding action of the feed lifting tooth 214; the rotating shuttle motor 31 drives the lower shaft 311 to realize that the rotating shuttle 312 connected with the lower shaft 311 executes the wire receiving and hooking actions, and the cloth feeding action of the cloth feeding teeth 214 and the wire receiving and hooking action of the rotating shuttle 312 jointly realize a bottom wire driving mechanism of the sewing machine. The needle threading driving mechanism is provided with an upper shaft motor 41, an upper shaft 411, a transmission piece 412 and a needle rod 413, and the upper shaft motor 41 drives the upper shaft 411 to realize the needle threading action of the needle threading driving mechanism. The normal sewing work of sewing machine is realized to work feed drive assembly, rotating shuttle drive assembly and drive mechanism that reaches standard grade under sewing machine's control system control, this application has broken traditional drive mechanism and has passed through the design that vertical axis transmission power arrived the lower shaft by main shaft motor, has realized sewing machine's non-oiling work by four motor common drives, and the transmission of sewing machine upper and lower structure is separately, does not need lubricating oil to lubricate, need not to match the complicated upper shaft, the taper gear train between vertical axis and the lower shaft has reduced manufacturing cost by a wide margin.

The lower thread driving mechanism is configured to cause the feed motor 11 to drive the feed shaft 111 and the feed motor 21 to drive the feed shaft 211 and to cause the feed dog 214 to perform a feed operation. The cloth feeding motor 11 and the feed lifting motor 21 are fixedly installed below the base plate 81 and located at both sides of the base plate 81, and the rotating shuttle motor 31 is fixedly installed between the cloth feeding motor 11 and the feed lifting motor 21. The cloth feeding motor 11, the feed dog motor 21 and the rotary hook motor 31 are installed near a side of the rotary hook 312 of the sewing machine.

The feed drive assembly also has a rack mount 212, a rack 213, feed dogs 214 and a feed dog fork crank 112. The cloth feeding shaft 111 is directly connected to the output shaft of the cloth feeding motor 11, or the cloth feeding shaft 111 and the output shaft of the cloth feeding motor 11 may be integrated. A feed fork shaped crank 112 is attached to the front end of the feed shaft 111, and the feed fork shaped crank 112 transmits a back and forth swing motion to the feed dog holder 213 by being driven by the feed motor 11 in a repeated back and forth swing operation mode, so that the feed dog 214 has a back and forth swing motion.

The feed lifting shaft 211 is directly connected to the output shaft of the feed lifting motor 21, or the feed lifting shaft 211 and the output shaft of the feed lifting motor 21 may be integrated. The front end of the feed lifting shaft 211 is provided with a tooth frame base 212, the tooth frame base 212 is connected with a tooth frame 213, a feed dog 214 is fixed on the tooth frame 213, and the tooth frame base 212 and the tooth frame 213 are driven by a feed lifting motor 21 in a repeated swinging back and forth mode to transmit vertical swinging motion to the tooth frame 213, so that the feed dog 214 has vertical swinging motion.

The feed dog 214 is swung back and forth by the feed dog motor 11 and swung up and down by the feed dog motor 21, so that the feed dog 214 performs a feed function when sewing by the sewing machine.

The rotating shuttle motor 31 drives the lower shaft 311 to rotate in a rotating manner, and the rotating lower shaft 311 drives the rotating shuttle 312 to rotate to perform a wire take-up and hooking action. The cloth feeding action of the cloth feeding dog 214 and the wire take-up and hooking action of the rotating shuttle 312 jointly realize a bottom thread driving mechanism of the sewing machine.

The upper shaft motor 41 of the upper shaft driving mechanism drives the upper shaft 411 to rotate in a rotating mode, the rotating operation is changed into the transmission part 412 of the needle rod 413 which moves up and down through the installation of the upper shaft 411, the cloth penetrating action of the needle rod 413 with the thread penetrating through the needle plate 51 is realized, the upper shaft 411 is not provided with a cam, the design concept of the traditional sewing machine is broken, the technology of a cloth feeding connecting rod and a tooth lifting connecting rod which are connected and driven by the cam is eliminated, the manufacturing cost of the sewing machine is reduced, and the efficient sewing machine without a lubricating system is provided. The upper shaft motor 41 is installed on one side or the middle or the rear part of the upper shaft 411 close to the needle bar 413, the rear part of the upper shaft motor 41 is also provided with a fan 414, the fan 414 is used for accelerating the air convection of the inner space of the sewing machine, the rear part of the upper shaft motor 41 is also connected with a connecting rod 416, the tail end of the connecting rod 416 is fixedly connected with a hand wheel 415 for adjusting the position of the needle bar 413, the upper shaft 411 and the connecting rod 416 run synchronously along with the driving of the upper shaft motor 41, the diameter of the connecting rod 416 is smaller than that of the upper shaft 411, and the diameter of the connecting rod 416 is relatively smaller. Here, no cam is provided on the upper shaft 411 on which the upper shaft motor 41 is mounted, and it is within the scope of the present application to claim whether the upper shaft motor 41 is mounted on the side of the upper shaft 411 near the needle shaft 413 or in the middle or rear position.

The sewing machine breaks through the technical scheme of the traditional sewing machine, eliminates a cloth feeding connecting rod and a tooth lifting connecting rod of the traditional sewing machine, and a taper gear set between a cam, a vertical shaft and a vertical shaft on a main shaft and a lower shaft, and can simultaneously shorten the manufacturing time of the tooth lifting shaft 211 and the cloth feeding shaft 111 (actually the tooth lifting shaft and the cloth feeding shaft in the existing sewing machine) so as to reduce the manufacturing cost, so that the tooth lifting amplitude of the cloth feeding tooth 214 is also controlled by a control system, the intelligent level of sewing is further improved, and the traditional part of the swinging seat is removed, and the swinging seat can completely have the functions. The feed motor 11 and the feed lifting motor 21 are simultaneously started and stopped under the control of the control system to achieve the coordinated feed motion of the feed lifting driving mechanism and avoid the uncoordinated sewing motion of the feed lifting motor 214 or the feed lifting motion of the feed lifting motor without the transfer feed motion. Because the repeated rotation operation mode of the cloth feeding motor 11 and the feed lifting motor 21 is preset by the control system, the cloth feeding action of the cloth feeding teeth 214 is always in a constant stitch length to carry out sewing work, namely, the cloth feeding and the feed lifting teeth are in a constant state, the condition that the size of the stitch length is deviated before and after the existing sewing machine technology is overcome, and the sewing quality and the stability of the sewing work are effectively improved.

The utility model provides a sewing machine's actuating mechanism's trimming and lift presser foot actuating mechanism has trimming subassembly and lifts the presser foot subassembly, and the trimming subassembly has trimming and lifts presser foot motor 61, trimming crank 71, trimming fork wheel 72 and trimming execution end 73. Wherein the trimming crank 71 has a pushing member 711, and the pushing member 711 is arranged at the eccentric position of the trimming crank 71. The pushing piece 711 pushes the thread cutting fork wheel 72 to perform thread cutting action, the thread cutting fork wheel 72 is provided with a return rod 722 and a thread cutting rod 721, and the pushing piece 711 is positioned between the return rod 722 and the thread cutting rod 721. Under the driving of the thread cutting crank 71 by the thread cutting and presser foot lifting motor 61, the pushing member 711 pushes the thread cutting rod 721 to make the thread cutting execution end 73 execute thread cutting action.

The presser foot lifting assembly is provided with a thread trimming and lifting motor 61, a presser foot lifting cam 74, a presser foot lifting ejector rod 75 and a presser foot lifting execution end 76, the presser foot lifting cam 74 is provided with a presser foot lifting cam lifting surface 741 and an idle circular arc surface 742, the presser foot lifting cam 74 is fixed on an output shaft of the thread trimming and lifting motor 61, the presser foot lifting cam lifting surface 741 is used for adjusting the presser foot lifting ejector rod 75 to be at a lower position or a higher position to be at a higher position or a lower position, and the idle circular arc surface 742 is used for idle rotation between the presser foot lifting ejector rod 75 and the presser foot lifting cam 74. The idle circular arc surface 742 is concentric with the output shaft of the trimming and presser foot lifting motor 61, and the presser foot lifting cam elevation surface 741 is located at the cam portion of the presser foot lifting cam 74.

After the thread trimming operation is completed, the presser foot lifting cam 74 starts to perform the presser foot lifting operation, and the actual presser foot lifting operation of the presser foot lifting cam 74 is not generated by the rotation angle of the thread trimming and presser foot lifting motor 61 during the thread trimming operation on the presser foot lifting push rod 75, so that the presser foot lifting push rod 75 and the idle circular arc surface 742 idle. The trimming and presser foot lifting motor 61 drives the presser foot lifting cam lifting surface 741 of the presser foot lifting cam 74 to lift the presser foot lifting ejector rod 75, and when the presser foot lifting ejector rod 75 reaches the highest point, the presser foot lifting ejector rod 75 is lifted to the highest point, and the presser foot lifting execution end 76 completes the presser foot lifting action.

The thread trimming and presser foot lifting motor 61 drives the presser foot lifting cam 74 in a clockwise manner during thread trimming, the presser foot lifting cam 74 drives the presser foot lifting ejector rod 75 to gradually transit from the idle circular arc surface 742 to the presser foot lifting cam lifting surface 741 under the driving of the thread trimming and presser foot lifting motor 61 until the presser foot lifting highest point is reached, the presser foot lifting action is realized, at the moment, the thread trimming and presser foot lifting motor 61 is locked, so that the presser foot lifting state is maintained for a period of time, and the sewing action of immediately lifting the presser foot after thread trimming is formed.

In addition, in the presser foot lifting process, the pushing piece 711 pushes the return rod 722, so that the pushing piece 711 pushes the return rod 722 to the original position, the whole thread trimming assembly is reset, the thread trimming assembly can be effectively and directly returned to the original position in the fault state of clamping, and the resetting function is realized.

When the presser foot is to be lowered, the thread trimming and presser foot lifting motor 61 returns the presser foot lifting ejector rod 75 from the presser foot lifting cam lifting surface 741 to the idle circular arc surface 742, so that the presser foot lowering operation is realized.

There is another scenario where the presser foot is lifted without cutting the thread, and usually stitches are made under a large degree of bending. The thread cutting and presser foot lifting motor 61 drives the presser foot lifting cam lifting surface 741 to jack the presser foot lifting ejector rod 75 to the highest point of the presser foot, and when the presser foot is placed, the thread cutting and presser foot lifting motor 61 drives the presser foot lifting cam lifting surface 741 to return reversely to complete the action of placing the presser foot.

The above description is only one of the preferred embodiments of the present application, and not intended to limit the scope of the present application, and all modifications that can be made to the equivalent structure or equivalent flow path by using the shape, structure and principle of the present application and the accompanying drawings, or applied to other related fields directly or indirectly are included in the scope of the present application.

Claims (10)

1. A driving mechanism of a sewing machine is provided with an upper shaft motor, an upper shaft, a lower shaft, a feed lifting tooth shaft and a feed conveying tooth, wherein the upper shaft is driven by the upper shaft motor.

2. The drive mechanism of a sewing machine of claim 1, wherein the upper shaft motor is mounted on the upper shaft at a side near the needle bar or at a middle or rear position.

3. The driving mechanism of a sewing machine according to claim 1 or 2, wherein a fan is further disposed at the rear part of the upper shaft motor, a connecting rod is further connected at the rear part of the upper shaft motor, the connecting rod and the upper shaft run synchronously, and a hand wheel for adjusting the position of the needle bar is fixedly connected at the tail end of the connecting rod.

4. The drive mechanism of a sewing machine according to claim 3, wherein the connecting rod has a smaller diameter than the upper shaft.

5. The driving mechanism of sewing machine as claimed in claim 1, wherein the rotating shuttle motor drives the lower shaft to perform the thread take-up and hooking actions of the rotating shuttle connected to the lower shaft, and the rotating shuttle motor is fixedly installed between the cloth feeding motor and the feed lifting motor.

6. The driving mechanism of a sewing machine according to claim 1, wherein the feed lifting shaft is connected to an output shaft of the feed lifting motor, or the feed lifting shaft is integrated with the output shaft of the feed lifting motor, a holder base is mounted at a front end of the feed lifting shaft, a holder is connected to the holder base, a feed dog is fixed to the holder base, and the holder base and the holder transmit a vertical swing motion to the holder base under the driving of the feed lifting motor in a repeated swinging back operation mode, so that the feed dog has a vertical swing motion.

7. The driving mechanism of sewing machine according to claim 1, wherein the cloth feeding shaft is connected to or integrated with an output shaft of the cloth feeding motor, and a feed lifting fork crank is mounted at a front end of the cloth feeding shaft and transmits a forward and backward swinging motion to the feed dog holder by being driven by the cloth feeding motor in a reciprocating and swinging motion, so that the feed dog has a forward and backward swinging motion.

8. The driving mechanism of sewing machine according to claim 1 or 4, wherein the feed motor and the feed lifting motor are installed and fixed under the base plate, and the feed motor and the feed lifting motor are located at both sides of the base plate.

9. The drive mechanism of a sewing machine according to claim 1 or 4, wherein the feed motor, the feed dog motor and the rotary hook motor are installed on a side of the rotary hook adjacent to the sewing machine.

10. The driving mechanism of a sewing machine according to claim 1, further comprising a presser foot lifting assembly and a thread trimming assembly, wherein the presser foot lifting assembly comprises a thread trimming and presser foot lifting motor, a presser foot lifting cam, a presser foot lifting ejector rod and a presser foot lifting execution end, the presser foot lifting cam comprises a presser foot lifting cam lifting surface and an idle rotation arc surface, the presser foot lifting cam is fixed on an output shaft of the thread trimming and presser foot lifting motor, the presser foot lifting cam lifting surface is used for adjusting the lower or higher position of the presser foot lifting ejector rod to the higher or lower position, the idle rotation arc surface is used for idle rotation between the presser foot lifting ejector rod and the presser foot lifting cam, the idle rotation arc surface and the output shaft of the thread trimming and presser foot lifting motor are arranged concentrically, and the presser foot lifting cam lifting surface is positioned at the output shaft of the presser foot lifting cam;

the thread trimming component is provided with a thread trimming and presser foot lifting motor, a thread trimming crank, a thread trimming fork wheel and a thread trimming execution end, the thread trimming crank is provided with a pushing piece, the pushing piece is arranged at the eccentric position of the thread trimming crank and pushes the thread trimming fork wheel to perform thread trimming action, the thread trimming fork wheel is provided with a return rod and a thread trimming rod, the pushing piece is positioned between the return rod and the thread trimming rod, and the pushing piece pushes the thread trimming rod to enable the thread trimming execution end to execute the thread trimming action under the condition that the thread trimming and presser foot lifting motor drives the thread trimming crank;

after the thread trimming action is finished, the presser foot lifting cam starts to perform the presser foot lifting action, the rotation angle of the thread trimming and presser foot lifting motor does not enable the presser foot lifting cam to generate actual presser foot lifting action on the presser foot lifting ejector rod during the thread trimming action, the presser foot lifting ejector rod and the idle circular arc surface are in idle rotation, the thread trimming and presser foot lifting motor drives the presser foot lifting cam lifting surface of the presser foot lifting cam to lift the presser foot lifting ejector rod, the presser foot lifting ejector rod is lifted to the highest point when the highest point of the presser foot lifting ejector rod is reached, and the presser foot lifting execution end completes the presser foot lifting action;

in the presser foot lifting process, the pushing piece pushes the return rod, so that the pushing piece pushes the return rod to the original position, the whole thread cutting assembly is reset, the thread cutting assembly can be effectively and directly returned to the original position in the fault state of clamping, and the resetting function is realized;

when the presser foot is to be lowered, the trimming and presser foot lifting motor returns the presser foot lifting ejector rod to the idle running arc surface from the presser foot lifting cam lifting surface under the action of the clockwise force, so that the action of lowering the presser foot is realized.

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