CN214938282U - Sewing machine - Google Patents

Abstract

The application provides a sewing machine, concretely relates to sewing machine manufacturing technical field, has gauge needle adjustment mechanism, feed dog positioning mechanism, lifts presser foot mechanism, thread trimming mechanism and drive arrangement, its characterized in that, the installation is fixed with compound wheel on the output shaft that drive arrangement has, and compound wheel has the location sheave and lifts the presser foot cam, and drive arrangement drive location sheave and lift the presser foot cam and carry out gauge needle adjustment action of gauge needle adjustment mechanism, the static position that feed dog's location feed dog did not have front and back feed action and lift the presser foot action of presser foot mechanism. After the driving device drives the positioning grooved wheel, the sewing machine determines the static position of the feed dog as soon as the sliding piece enters the positioning action groove, so that the sewing machine can execute the thread cutting action and the presser foot lifting action/or the presser foot lifting action, and the technical problem of the feed dog lifting action when the presser foot lifting action is carried out in the one-driving-two scheme of the stepping motor is solved.

Description

Sewing machine

Technical Field

The application provides a sewing machine, concretely relates to sewing machine makes technical field.

Background

The technical scheme that a stepping motor is used for controlling needle pitch adjustment and presser foot lifting action is provided by a sewing machine, mechanical transmission components such as a needle pitch adjusting crank, a presser foot lifting crank and the like are arranged on the motor, the needle pitch adjusting crank indirectly or directly acts on a swing seat, and the acting angle and the position of the stepping motor and the needle pitch adjusting crank are adjusted so as to realize the adjustment of the needle pitch of the sewing machine; the presser foot lifting action is implemented at different rotation angles by the stepping motor, and the technical effect of dragging two by one by the stepping motor is achieved. However, when the sewing machine finishes the action of lifting the presser foot, the feed dog indirectly connected with the swinging seat and the feed shaft can perform the action of lifting, and the action is almost performed simultaneously with the action of lifting the presser foot, so that the feed dog is lifted to be in the state of being higher than the surface of the needle plate. The cloth feeding tooth on the surface of the high needle plate can influence the condition that the discharge work of sewing materials is finished, and the sewing materials are hooked by the cloth feeding tooth and damaged; secondly, the next sewing operation is adversely affected.

Disclosure of Invention

The sewing machine is characterized in that a composite wheel is fixedly arranged on an output shaft of the driving device, the composite wheel is provided with a positioning sheave and a presser foot lifting cam, and the driving device drives the positioning sheave and the presser foot lifting cam to execute the needle pitch adjusting action of the needle pitch adjusting mechanism, and the static position of the positioning feed dog of the feed dog positioning mechanism without front and back feed actions and the presser foot lifting action of the presser foot lifting mechanism.

Preferably, the positioning grooved wheel is a sliding part which is correspondingly matched with the grooved wheel swing rod, the sliding part is a grooved wheel swing rod swing working shaft, the driving device drives the positioning grooved wheel, the positioning grooved wheel rotates by a certain angle to change the action position between the sliding part and the needle pitch adjusting action groove, the needle pitch adjusting action groove pushes the sliding part, the grooved wheel swing rod pushes the transmission rod, the transmission rod pushes the transmission shaft sleeve, the transmission connecting rod connected with the transmission shaft sleeve pushes the connecting rod, and the connecting rod changes the original needle pitch of the swing seat.

Preferably, one end of the grooved pulley oscillating rod is sleeved on the support frame, the support frame is fixed on the machine body, the grooved pulley oscillating rod rotates by taking the support frame as a rotating shaft, the transmission shaft is sleeved on the cloth feeding shaft, and the transmission shaft sleeve and the cloth feeding shaft are in clearance fit.

Preferably, the driving device drives the positioning grooved wheel to rotate by a certain angle to indirectly realize the static position of the positioning cloth feeding tooth without front and rear cloth feeding actions, the positioning grooved wheel rotates by a certain angle to enable the sliding part to enter the positioning action groove, the sliding part entering the positioning action groove lifts up the whole grooved wheel oscillating rod, the grooved wheel oscillating rod pushes the transmission rod, the transmission rod pushes the transmission shaft sleeve, the transmission connecting rod connected with the transmission shaft sleeve pushes the connecting rod, and the connecting rod enables the short oscillating plate and the long oscillating plate of the oscillating seat to be in a zero needle distance position of the oscillating seat in a flush state.

Preferably, the swinging seat is hinged with a feeding crank, and the feeding crank is fastened on the cloth feeding shaft.

Preferably, the sewing machine executes the thread cutting action and the presser foot lifting action/or the presser foot lifting action in sequence after the sliding piece enters the positioning action groove and determines the static position of the feed dog without front and back feed actions.

Preferably, the driving device executes the trimming action of the trimming mechanism within the trimming rotation angle, the trimming mechanism mainly comprises a trimming fork wheel, a trimming crank and a trimming action shaft, the output shaft of the driving device is fixedly provided with the trimming crank, the trimming crank is fixedly provided with the trimming action shaft, the trimming fork wheel is fixedly arranged on the rotating shaft, the rotating shaft is connected with the trimming tail execution end, the trimming fork wheel is provided with a trimming action surface and a trimming return action rod, the trimming action shaft is positioned between the trimming action surface and the trimming return action rod, and the driving device drives the trimming action shaft to rotate to push the trimming action surface to enable the trimming fork wheel and the rotating shaft to rotate so as to push the trimming tail execution end to execute the trimming action.

Preferably, the presser foot lifting mechanism is provided with a presser foot lifting cam and a presser foot lifting mandril, the driving device drives the presser foot lifting cam to lift the presser foot lifting mandril, the presser foot lifting cam is provided with a first presser foot lifting action surface, a second presser foot lifting action surface, a presser foot lifting peak and an idle rotation surface, the presser foot lifting peak is positioned on the cam surface of the presser foot lifting cam between the first presser foot lifting action surface and the second presser foot lifting action surface, and the idle rotation surface is positioned on the concentric arc surface of the presser foot lifting cam.

Preferably, the positioning grooved wheel is also provided with a first transition groove and a second transition groove, and the sliding piece enters the positioning acting groove through the first transition groove or the second transition groove; and the presser foot lifting mandril returns to the starting point position from the first transition groove or the second transition groove.

Preferably, the presser foot lifting ejector rod is sleeved in the positioning sleeve, the presser foot lifting ejector rod is lifted by the presser foot lifting cam, and then the presser foot lifting action is executed by the presser foot lifting tail execution end.

According to the sewing machine, the compound wheel is fixedly mounted on the output shaft of the driving device, the compound wheel is provided with the positioning grooved wheel and the presser foot lifting cam, the driving device drives the positioning grooved wheel and the presser foot lifting cam to execute the needle pitch adjusting action of the needle pitch adjusting mechanism, the static position of the positioning feed dog of the feed dog positioning mechanism without front and back feed actions and the presser foot lifting action of the presser foot lifting mechanism. Specifically, a positioning grooved wheel is correspondingly matched with a sliding part provided with a grooved wheel swinging rod, the sliding part is a grooved wheel swinging rod swinging working shaft, a driving device drives the positioning grooved wheel, the positioning grooved wheel rotates by a certain angle to change the action position between the sliding part and a needle pitch adjusting action groove, the needle pitch adjusting action groove pushes the sliding part, the grooved wheel swinging rod pushes a transmission rod, the transmission rod pushes a transmission shaft sleeve, a transmission connecting rod connected with the transmission shaft sleeve pushes a connecting rod, and the connecting rod changes the original needle pitch of a swinging seat; the positioning feed dog is indirectly positioned at a static position under the action of front and back feed through driving the positioning grooved wheel to rotate by a certain angle by the driving device, the positioning grooved wheel rotates by a certain angle to enable the sliding part to enter the positioning action groove, the sliding part entering the positioning action groove raises the whole grooved wheel oscillating rod, the grooved wheel oscillating rod pushes the transmission rod, the transmission rod pushes the transmission shaft sleeve, the transmission connecting rod connected with the transmission shaft sleeve pushes the connecting rod, and the connecting rod enables the short oscillating plate and the long oscillating plate of the oscillating seat to be in a flushing state and is in a zero needle pitch position of the oscillating seat. The static position of the feed dog without front and rear feed actions is controlled and realized based on the sewing machine electric control system, after the driving device drives the positioning grooved wheel, the static position of the feed dog is determined as soon as the sliding piece enters the positioning action groove, so that the sewing machine can execute thread cutting action and presser foot lifting action/presser foot lifting action, the technical problem that the feed dog is lifted when the presser foot is lifted in a one-to-two stepping motor scheme is solved, and the sewing machine has high popularization and use values.

Drawings

FIG. 1 is a main structural view of a sewing machine of the present application;

FIG. 2 is a view of the present application showing the position of the compound wheel and swing seat of a sewing machine;

FIG. 3 is a view of the construction of the swing lever and driving sleeve of a sewing machine according to the present application;

FIG. 4 is a schematic view of a stitch length adjustment slot and a driving sleeve of a sewing machine according to the present application;

FIG. 5 is a diagram of a positioning sheave of a sewing machine of the present application;

FIG. 6 is a view of a structure of a presser foot lifting cam of the sewing machine according to the present application;

FIG. 7 is a schematic view of a thread trimming mechanism of a sewing machine according to the present application.

Reference numerals: the device comprises a needle pitch adjusting mechanism 10, a compound wheel 11, a positioning grooved wheel 111, a needle pitch adjusting groove 112, a first transition groove 113, a second transition groove 114, a positioning action groove 115, a maximum positive needle pitch point 116, a maximum negative needle pitch point 117, a grooved wheel swing rod 12, a sliding part 121, a support frame 122, a transmission rod 13, a transmission shaft sleeve 14, a transmission connecting rod 15, a connecting rod 16, a swing seat 17, a short swing plate 171, a long swing plate 172, a cloth feeding shaft 18, a feeding crank 19, a presser foot lifting mechanism 30, a presser foot lifting cam 31, an idle surface 311, a presser foot lifting peak 312, a presser foot lifting action surface one 313, a presser foot lifting action surface two 314, a presser foot lifting ejector rod 32, a driving device 40, an output shaft 41, a cloth feeding tooth positioning mechanism 50, a thread trimming mechanism 70, a thread trimming fork wheel 71, a rotating shaft 72, a thread trimming action surface 73, a thread trimming return action rod 74, a thread trimming crank 75, a thread trimming action shaft 76 and a thread trimming tail end 77.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to fig. 1 to 7, 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.

A sewing machine provided by the present application has a stitch length adjusting mechanism 10, a feed dog positioning mechanism 50, a presser foot lifting mechanism 30, a thread trimming mechanism 70, and a driving device 40 for driving the above mechanisms. The output shaft 41 of the driving device 40 is fixedly provided with a compound wheel 11, and the compound wheel 11 is provided with a positioning grooved wheel 111 and a pressure foot lifting cam 31. The compound wheel 11 is driven by the driving device 40 to perform a needle pitch adjusting action, a stationary position where the positioning feed dog has no front and rear feed actions, a presser foot lifting action, and a thread cutting action, where the thread cutting action of the thread cutting mechanism 70 is additional and optional, by using the characteristics of the positioning sheave 111 and the presser foot lifting cam 31. The above-mentioned stitch length adjusting action, the stationary position of the positioning feed dog without the feed action, the presser foot raising action and the thread cutting action are performed at different times in each drive rotation angle of the drive device 40, and are realized under the control of an electric control system provided in the present sewing machine.

The positioning grooved wheel 111 and the pressure raising and pressing foot cam 31 of the compound wheel 11 are integrally fixed on the output shaft 41, and as another embodiment, the positioning grooved wheel 111 and the pressure raising and pressing foot cam 31 can also be separately arranged, and the positioning grooved wheel 111 and the pressure raising and pressing foot cam 31 are respectively arranged on the corresponding positions on the output shaft 41 as two parts, so that the technical effect is the same as that of the whole.

The positioning grooved wheel 111 of the composite wheel 11 has a needle pitch adjusting function, the needle pitch adjusting mechanism 10 has a driving device 40, the positioning grooved wheel 111, a grooved wheel swing lever 12, a transmission rod 13, a transmission shaft sleeve 14 and a swing seat 17, and the positioning grooved wheel 111 has a needle pitch adjusting function groove 112, a first transition groove 113, a second transition groove 114 and a positioning function groove 115. The portions of the gauge adjustment function groove 112 adjacent to the positioning function groove 115 are a first transition groove 113 and a second transition groove 114. The positioning grooved wheel 111 is correspondingly matched with a sliding piece 121 which is arranged on the grooved wheel swinging rod 12, and the sliding piece 121 runs among the needle pitch adjusting acting groove 112, the first transition groove 113, the second transition groove 114 and the positioning acting groove 115 under the driving of the positioning grooved wheel 111. The sliding member 121 is a working shaft for swinging the sheave swinging lever 12, and the sliding member 121 is located at approximately the middle position of the sheave swinging lever 12. The transition groove I113 or the transition groove II 114 is used for leading the sliding part 121 to return to the positioning action groove 115 at the positive needle pitch maximum point 116 or the negative needle pitch maximum point 117 of the swinging seat 17, the positive needle pitch maximum point 116 and the negative needle pitch maximum point 117 are positioned at the tail end points of the two ends of the needle pitch adjusting action groove 112, and the positive needle pitch maximum point 116 and the negative needle pitch maximum point 117 are uncertain and can be interchanged due to different models of sewing machines.

One end of the grooved pulley swing rod 12 is sleeved on the support frame 122, the support frame 122 is fixed on the machine body, and the grooved pulley swing rod 12 rotates with the support frame 122 as a rotating shaft. The other end of the grooved pulley swing rod 12 is hinged with a transmission rod 13, and the other end of the transmission rod 13 is hinged with a transmission shaft sleeve 14. The other end of the driving shaft sleeve 14 is connected with a driving connecting rod 15, the driving connecting rod 15 is hinged with a connecting rod 16, and the connecting rod 16 is hinged with a swinging seat 17. The transmission shaft sleeve 14 is sleeved on the cloth feeding shaft 18, and the transmission shaft sleeve 14 and the cloth feeding shaft 18 are in clearance fit.

The feed dog positioning mechanism 50 includes a driving device 40, a positioning sheave 111, a sheave swing lever 12, a transmission lever 13, a transmission sleeve 14, a transmission link 15, a connecting rod 16, a swing base 17, a feed shaft 18, and feed dogs. The needle pitch adjustment is that the driving device 40 rotates the positioning grooved wheel 111 by a certain angle to indirectly change the swing angle of the swing seat 17, specifically, the driving device 40 drives the positioning grooved wheel 111, the positioning grooved wheel 111 rotates by a certain angle to change the action position between the sliding part 121 and the needle pitch adjustment action groove 112, that is, the needle pitch adjustment action groove 112 pushes the sliding part 121, and further pushes the grooved wheel swing rod 12 and the transmission rod 13, the transmission rod 13 pushes the transmission shaft sleeve 14, the transmission connecting rod 15 connected with the transmission shaft sleeve 14 pushes the connecting rod 16, and finally the connecting rod 16 changes the original needle pitch swing angle of the swing seat 17, so that the needle pitch adjustment is realized. The stitch length adjustment is performed in a non-sewing state of the sewing machine, and the stitch length after the adjustment is successful is given to the swing seat 17 with a new stitch length for sewing.

The positioning grooved wheel 111 of the composite wheel 11 has a function of positioning a stationary position where the feed dog has no forward and backward feed operation, and realizes a stationary position function where the feed dog has no feed operation by the feed dog positioning mechanism 50.

The feed dog static position positioning action is that the driving device 40 rotates the positioning grooved wheel 111 by a certain angle to indirectly position the feed dog at a static position without front and rear feed actions, specifically, the driving device 40 drives the positioning grooved wheel 111, and the positioning grooved wheel 111 rotates by a certain angle to enable the sliding part 121 to enter the positioning action groove 115. The sliding part 121 entering the positioning action groove 115 raises the whole grooved pulley swing rod 12, then the grooved pulley swing rod 12 pushes the transmission rod 13, the transmission rod 13 pushes the transmission shaft sleeve 14, the transmission connecting rod 15 connected with the transmission shaft sleeve 14 pushes the connecting rod 16, and the connecting rod 16 enables the short swing plate 171 and the long swing plate 172 of the swing seat 17 to be in a zero-needle-pitch position of the swing seat 17 in a flush state, wherein the zero-needle-pitch position is a static position where the positioning feed dog does not have a feed action. The swing base 17 is hinged with a feeding crank 19, and the feeding crank 19 is fastened on a cloth feeding shaft 18. When the feed crank 19 connected between the short swing plate 171 and the long swing plate 172 is in a zero-pitch state of the swing base 17, the swing base 17 does not give a swing source to the feed crank 19, the cloth feeding shaft 18 connected to the feed crank 19 naturally has no swing source, and finally, the cloth feeding dog indirectly connected to the cloth feeding shaft 18 has no forward and backward cloth feeding motion, that is, the slide member 121 achieves a static position at which the cloth feeding dog has no forward and backward cloth feeding motion as soon as entering the positioning action groove 115.

After the positioning feed dog has no front and rear feed motion static position, the thread cutting mechanism 70 of the sewing machine executes thread cutting motion, and the presser foot lifting mechanism executes presser foot lifting motion. Before the presser foot lifting action, the sewing machine executes the thread cutting action. In the case where the stationary position of the feed dog without the back and forth feed operation is achieved as soon as the slider 121 enters the positioning operation groove 115, the sewing machine performs thread trimming under the determination that the feed dog has no back and forth feed operation stationary position. The positioning grooved wheel 111 is driven by the driving device 40, the sliding part 121 enters the positioning acting groove 115, the sewing machine determines the static position of the feed dog without front and back feed actions and then executes the thread cutting action and the presser foot lifting action/or the presser foot lifting action in sequence, the thread cutting action and the presser foot lifting action are executed in sequence after the sewing work is finished, and the sewing stitch is changed after the presser foot lifting action is executed.

The drive device 40 is used for executing the thread cutting action of the thread cutting mechanism 70 within the thread cutting corner. The thread cutting mechanism 70 mainly comprises a thread cutting fork wheel 71 and a thread cutting action shaft 76, wherein a thread cutting crank 75 is fixedly installed on the output shaft 41 of the driving device 40, and the thread cutting action shaft 76 is fixedly installed on the thread cutting crank 75. The thread cutting fork wheel 71 is fixed on a rotating shaft 72, and the rotating shaft 72 is connected with a thread cutting end execution end 77. The thread cutting fork wheel 71 is provided with a thread cutting acting surface 73 and a thread cutting return acting rod 74, the thread cutting acting shaft 76 is positioned between the thread cutting acting surface 73 and the thread cutting return acting rod 74, and the driving device 40 drives the thread cutting acting shaft 76 to rotate to push the thread cutting acting surface 73, so that the thread cutting fork wheel 71 and the rotating shaft 72 rotate to push the thread cutting end executing end 77 to execute thread cutting action. After the thread cutting operation is completed, the thread cutting return operation lever 74 is retracted to its original position by the rotation of the thread cutting operation shaft 76, thereby achieving the return operation of the thread cutting mechanism 70.

The presser foot lifting cam 31 of the presser foot lifting mechanism 30 has a function of performing a presser foot lifting operation, and the presser foot lifting mechanism 30 has a driving device 40, the presser foot lifting cam 31, and a presser foot lifting jack 32. The positioning grooved wheel 111 is driven by the driving device 40, and the sewing machine performs a thread cutting action and a presser foot lifting action from the beginning when the sliding member 121 enters the positioning acting groove 115 through the first transition groove 113 or the second transition groove 114. The presser foot lifting cam 31 is provided with a first presser foot lifting action surface 313, a second presser foot lifting action surface 314, a presser foot lifting peak 312 and an idle surface 311, the presser foot lifting peak 312 is positioned on the cam surface of the presser foot lifting cam 31 between the first presser foot lifting action surface 313 and the second presser foot lifting action surface 314, and the idle surface 311 is positioned on the concentric arc surface of the presser foot lifting cam 31. When the sewing machine executes other sewing actions, the presser foot lifting mandril 32 abuts against the idle surface 311 of the presser foot lifting cam 31, so that the driving device 40 does not actually act on the presser foot lifting mechanism 30 when the sewing machine executes other sewing actions.

The drive device 40 performs a presser foot raising operation within the presser foot raising corner. The driving device 40 drives the presser foot lifting cam 31 to lift the presser foot lifting ejector rod 32, and the sliding part 121 can enter the positioning action groove 115 from the first transition groove 113 or the second transition groove 114 and push the positioning action groove 115, so that the other invention point of the application is that the presser foot lifting action of the feed dog is determined at the rest position without front and back feed actions. The first presser foot action surface 313 or the second presser foot action surface 314 of the presser foot lifting cam 31 can reach the presser foot lifting peak 312 for the presser foot lifting ram 32, and the presser foot lifting ram 32 can return to the starting position from the first transition groove 113 or the second transition groove 114. The presser foot lifting ejector rod 32 is sleeved in the positioning sleeve, the presser foot lifting ejector rod 32 is jacked by the presser foot lifting cam 31, then the presser foot lifting action is executed by the end execution end of the presser foot lifting, and the sewing machine of the application realizes the presser foot lifting action under the condition that the feed dog does not have front and back feed actions, so that the sewing machine has higher technical value.

The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims (10)

1. A sewing machine is provided with a needle pitch adjusting mechanism (10), a feed dog positioning mechanism (50), a presser foot lifting mechanism (30) and a driving device (40), and is characterized in that a compound wheel (11) is fixedly installed on an output shaft (41) of the driving device (40), the compound wheel (11) is provided with a positioning grooved wheel (111) and a presser foot lifting cam (31), and the driving device (40) drives the positioning grooved wheel (111) and the presser foot lifting cam (31) to execute the needle pitch adjusting action of the needle pitch adjusting mechanism (10), the static position of the positioning feed dog of the feed dog positioning mechanism (50) without the front and back feed actions and the presser foot lifting action of the presser foot lifting mechanism (30).

2. The sewing machine according to claim 1, wherein the positioning grooved wheel (111) corresponds to a sliding member (121) matched with the grooved wheel swing lever (12), the sliding member (121) is a swing working shaft of the grooved wheel swing lever (12), the driving device (40) drives the positioning grooved wheel (111), the positioning grooved wheel (111) rotates a certain angle to change an acting position between the sliding member (121) and the needle pitch adjusting acting groove (112), the needle pitch adjusting acting groove (112) pushes the sliding member (121), the grooved wheel swing lever (12) pushes the transmission rod (13), the transmission rod (13) pushes the transmission sleeve (14), the transmission link (15) connected with the transmission sleeve (14) pushes the connection rod (16), and the connection rod (16) changes an original needle pitch of the swing seat (17).

3. The sewing machine of claim 2, wherein one end of the grooved pulley oscillating rod (12) is sleeved on the support frame (122), the support frame (122) is fixed on the machine body, the grooved pulley oscillating rod (12) rotates by taking the support frame (122) as a rotating shaft, the transmission shaft sleeve (14) is sleeved on the cloth feeding shaft (18), and the transmission shaft sleeve (14) and the cloth feeding shaft (18) are in clearance fit.

4. The sewing machine according to claim 1, characterized in that the driving device (40) drives the positioning sheave (111) to rotate by a certain angle to indirectly realize a static position of the positioning feed dog without front and rear feed actions, the positioning sheave (111) rotates by a certain angle to enable the sliding part (121) to enter the positioning action groove (115), the sliding part (121) entering the positioning action groove (115) lifts up the whole sheave oscillating rod (12), the sheave oscillating rod (12) pushes the transmission rod (13), the transmission rod (13) pushes the transmission shaft sleeve (14), the transmission link rod (15) connected with the transmission shaft sleeve (14) pushes the connection rod (16), and the connection rod (16) enables the short oscillating plate (171) and the long oscillating plate (172) of the oscillating seat (17) to be in a flush state and is in a zero needle pitch position of the oscillating seat (17).

5. Sewing machine as in claim 4, characterized in that said oscillating seat (17) is hinged to a feed crank (19), the feed crank (19) being fastened to the feed shaft (18).

6. A sewing machine according to claim 2 or 4, characterized in that the thread cutting action and the presser foot lifting action/or the presser foot lifting action are carried out in succession as soon as the slider (121) enters the positioning action slot (115) and the sewing machine determines a rest position in which the feed dog has no back and forth feed action.

7. The sewing machine of claim 1, further comprising a thread cutting mechanism (70), wherein the driving device (40) performs a thread cutting operation of the thread cutting mechanism (70) within a thread cutting rotation angle, the thread cutting mechanism (70) mainly comprises a thread cutting fork wheel (71), a thread cutting crank (75) and a thread cutting action shaft (76), the output shaft (41) of the driving device (40) is fixedly provided with the thread cutting crank (75), the thread cutting crank (75) is fixedly provided with the thread cutting action shaft (76), the thread cutting fork wheel (71) is fixedly provided on a rotating shaft (72), the rotating shaft (72) is connected with a thread cutting end execution end (77), the thread cutting fork wheel (71) is provided with a thread cutting action surface (73) and a thread cutting return action rod (74), the thread cutting action shaft (76) is located between the thread cutting action surface (73) and the thread cutting return action rod (74), and the driving device (40) drives the thread cutting action shaft (76) to rotate to push the thread cutting action surface (73) so that the thread cutting fork wheel (71) performs the thread cutting action (71) within the thread cutting rotation angle ) And the rotating shaft (72) rotates to push the thread cutting end execution end (77) to execute thread cutting action.

8. The sewing machine according to claim 1, wherein the presser foot lifting mechanism (30) has a presser foot lifting cam (31) and a lifting presser foot ram (32), the driving device (40) drives the presser foot lifting cam (31) to lift the presser foot ram (32), the presser foot lifting cam (31) has a first presser foot lifting action surface (313), a second presser foot lifting action surface (314), a presser foot lifting peak (312) and an idle rotation surface (311), the presser foot lifting peak (312) is located on a cam surface of the presser foot lifting cam (31) between the first presser foot lifting action surface (313) and the second presser foot lifting action surface (314), and the idle rotation surface (311) is located on a concentric arc surface of the presser foot lifting cam (31).

9. The sewing machine of claim 2, wherein the positioning sheave (111) further has a first transition groove (113) and a second transition groove (114), the slider (121) passes through the first transition groove (113) or the second transition groove (114) to enter the positioning action groove (115), and the presser foot lifting ram (32) returns to the starting position from the first transition groove (113) or from the second transition groove (114).

10. The sewing machine of claim 8, wherein the presser foot lifting ejector rod (32) is sleeved in the positioning sleeve, the presser foot lifting ejector rod (32) is lifted by the presser foot lifting cam (31), and then the presser foot lifting action is executed by the presser foot lifting end executing end.

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