CN215887453U - Driving mechanism of sewing machine - Google Patents

Abstract

The utility model provides a driving mechanism of a sewing machine, and particularly relates to the technical field of manufacturing of sewing machines. The needle pitch regulation acting surface, the positioning and presser foot thread trimming acting surface, the positioning and thread trimming acting surface, the first transition surface and the second transition surface form a space which can be used for the circular swinging piece to move in the circular swinging piece, and the elastic piece with the downward direction is arranged on the swinging rod, so that the noise generated when the regulating wheel and the circular swinging piece move is relatively low, the operation performance of a driving mechanism of the sewing machine is improved, and the scheme of the application has high popularization and use values.

Description

Driving mechanism of sewing machine

Technical Field

The utility model provides a driving mechanism of a sewing machine, and particularly relates to the technical field of manufacturing of sewing machines.

Background

The sewing machine with the zero position function comprises a driving wheel, a needle distance adjusting groove, a needle distance adjusting function, a needle distance adjusting and zero position positioning wheel, a first return-to-zero transition groove and a second return-to-zero transition groove, a slider, a first return-to-zero transition groove or a second return-to-zero transition groove, a driving wheel, a needle distance adjusting and zero position positioning wheel, a driving motor, a long feeding swing plate and a short feeding swing plate, wherein the needle distance adjusting groove and the needle distance adjusting function are arranged on the driving wheel, the slider enters the zero position positioning groove of a feeding tooth from the first return-to-zero transition groove or the second return-to-zero transition groove, the driving wheel is provided with the needle distance adjusting and zero position positioning wheel, the driving motor drives the needle distance adjusting and zero position positioning wheel to push the slider with a needle distance lever to enter the zero position positioning groove of the feeding tooth with the needle distance adjusting and zero position positioning wheel, and the long feeding swing plate and the short feeding swing plate with the swing seat are pushed to be flush through the needle distance lever and the needle distance adjusting connecting rod and the needle distance adjusting and the short swing plate. The sliding piece slides between the outer circular wall and the inner circular wall, and the sliding piece has larger abrasion to the outer wall and the inner wall due to the operation of the sliding piece in the closed-loop zero-position positioning groove of the feed dog, and particularly has larger noise generated by the transition between the groove and the groove, so that the driving wheel and the sliding piece need to be improved.

Disclosure of Invention

The technical problem to be solved by the application is to provide a driving mechanism of a sewing machine, which is provided with a driving motor, an adjusting wheel, a circular oscillating piece, an oscillating rod, a connecting rod, an oscillating seat, a crank, a cloth feeding shaft, a cloth feeding tooth rack, a cloth feeding tooth seat and a cloth feeding tooth, wherein the driving motor drives the adjusting wheel, the adjusting wheel acts on the circular oscillating piece on the oscillating rod, the oscillating rod is hinged with the connecting rod, and the connecting rod is indirectly connected with the cloth feeding tooth through the oscillating seat, the crank, the cloth feeding shaft, the cloth feeding tooth rack and the cloth feeding tooth seat.

Preferably, the swing lever is provided with an upward-directed elastic member.

Preferably, the adjusting wheel is connected with and fixed with a pressure foot lifting cam, and a thread trimming crank is fixed on the pressure foot lifting cam.

Preferably, the adjusting wheel is arranged on one side of the output shaft close to the driving motor, and the presser foot lifting cam is arranged between the thread trimming crank and the adjusting wheel; a yielding part of the sewing machine for the feeding connecting rod to operate is arranged between the adjusting wheel and the presser foot lifting cam; or a yielding part for the sewing machine to operate the feeding connecting rod is arranged on one side of the presser foot lifting cam, which is close to the thread cutting crank.

Preferably, the thread cutting crank and the presser foot lifting cam fixed on the output shaft respectively perform thread cutting and presser foot lifting actions, and the adjusting wheel is provided with a positioning and presser foot acting surface for preventing power from being transmitted to the circular swinging piece when the output shaft performs the thread cutting and the presser foot lifting actions.

Preferably, the trimming crank is provided with a pushing part, the pushing part pushes the trimming fork wheel to realize trimming, the trimming fork wheel is provided with a trimming return rod and a trimming push rod, the pushing part is positioned between the trimming return rod and the trimming push rod, and the pushing part is arranged between the trimming return rod and the trimming push rod, so that when the driving motor is avoided driving the adjusting wheel, power is transmitted to the trimming return rod or the trimming push rod.

Preferably, the pushing member is arranged at the tail end position of the thread trimming crank.

Preferably, the presser foot lifting cam has an idle surface and a presser foot lifting surface, and the idle surface is used for avoiding power transmission to the presser foot lifting ejector rod when the driving motor drives the adjusting wheel.

Preferably, the circular swinging piece acts on the positioning and presser foot acting surface of the adjusting wheel, and the positioning and presser foot acting surface, the positioning and thread cutting acting surface and the shaft hole of the adjusting wheel are arranged in a concentric circle.

Compared with the prior art, the beneficial effects of this application are: the needle pitch regulation acting surface, the positioning and presser foot acting surface, the positioning and thread cutting acting surface, the first transition surface and the second transition surface form a space for the circular swinging piece to move in the space, and the elastic piece with the downward direction is arranged on the swinging rod, so that the noise generated when the regulating wheel and the circular swinging piece move is relatively low, the operation performance of a driving mechanism of the sewing machine is improved, and the scheme of the application has high popularization and use values.

Drawings

FIG. 1 is a view of a drive mechanism of a sewing machine according to the present application;

FIG. 2 is a view of the present application showing a drive mechanism pitch adjustment assembly;

FIG. 3 is a view of the drive mechanism pitch adjustment assembly drive configuration of a sewing machine according to the present application;

FIG. 4 is a schematic view of a drive mechanism swing link and connecting rod of a sewing machine according to the present application;

FIG. 5 is an internal configuration view of a drive mechanism adjustment wheel of a sewing machine according to the present application;

FIG. 6 is a thread trimming and presser foot lifting mechanism diagram of a drive mechanism of a sewing machine according to the present application;

FIG. 7 is a view showing a driving wheel structure of a driving mechanism of a sewing machine according to the present application.

Reference numerals: the thread cutting machine comprises a driving motor 11, an output shaft 12, a driving wheel 20, an adjusting wheel 21, a shaft hole 210, a needle pitch adjusting action surface 211, a central line 2111, a positioning and pressing action surface 212, a pressing foot highest point 2121, a positioning and thread cutting action surface 213, a first transition surface 214, a second transition surface 215, a pressing foot lifting cam 22, an idle rotation surface 221, a pressing foot lifting surface 222, a thread cutting crank 23, a pushing piece 231, a circular swinging piece 31, a swinging rod 41, a supporting shaft 42, an elastic piece 43, a connecting rod 51, a bracket 52, a swinging seat 61, a crank 62, a cloth feeding shaft 63, a cloth feeding tooth seat 64, a cloth feeding tooth frame 65, a cloth feeding tooth 66, a needle plate upper plane 67, a pressing foot ejector rod 71, a pressing foot lifting and pressing foot execution end 72, a thread cutting fork wheel 81, a thread cutting return rod 811, a thread cutting push rod 812 and a thread cutting execution end 813.

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.

Referring to the attached drawings, the driving mechanism of the sewing machine provided by the application comprises a needle pitch adjusting mechanism, a feed dog zero-needle pitch positioning mechanism, a thread cutting and presser foot lifting mechanism, a control system and the like, and the sewing machine has all functions of realizing normal sewing work besides the mechanism system. The needle pitch adjusting mechanism realizes the needle pitch adjustment of the sewing machine at the driving mechanism, the feed dog zero-needle-pitch positioning mechanism realizes the determination of the feed dog zero-needle-pitch position of the sewing machine at the driving mechanism, and the thread cutting and presser foot lifting mechanism realizes the needle pitch adjusting function of the sewing machine under the driving of the driving mechanism. The sewing machine comprises a driving motor 11, an adjusting wheel 21, a circular swinging piece 31, a swinging rod 41, a connecting rod 51, a swinging seat 61, a cloth feeding shaft 63, a crank 62, a cloth feeding tooth frame 65, a cloth feeding tooth seat 64, a cloth feeding tooth 66, a pressure foot lifting cam 22, a thread trimming crank 23, a pressure foot lifting ejector rod 71, a thread trimming fork wheel 81 and the like.

The driving motor 11 is fixed on a side frame body (not shown in the figures) of the sewing machine, the driving motor 11 is connected with an output shaft 12, a driving wheel 20 is fixed on the output shaft 12, the driving wheel 20 specifically comprises an adjusting wheel 21, a thread cutting crank 23 and a presser foot lifting cam 22, the adjusting wheel 21 is connected and fixed with the presser foot lifting cam 22, or the adjusting wheel 21 and the presser foot lifting cam 22 are integrated, the thread cutting crank 23 is connected with the side position of the presser foot lifting cam 22 in a fixed mode, and the presser foot lifting cam 22 and the adjusting wheel 21 can be manufactured respectively and then connected and fixed together. Under the control of the control system, the driving motor 11 drives the adjusting wheel 21 through the output shaft 12 to perform needle pitch adjustment and determination of the zero needle pitch position of the feed dog; under the control of the control system, the driving motor 11 drives the thread cutting crank 23 to execute thread cutting action through the output shaft 12; under the control of the control system, the driving motor 11 drives the presser foot lifting cam 22 through the output shaft 12 to perform the presser foot lifting action. An adjusting wheel 21 of the driving wheel 20 is arranged on one side of the output shaft 12 close to the driving motor 11, and a presser foot lifting cam 22 is arranged between a thread trimming crank 23 and the adjusting wheel 21; an abdication part for the feeding connecting rod to run of the sewing machine is arranged between the adjusting wheel 21 and the presser foot lifting cam 22 so as to fully utilize the limited space in the sewing machine; alternatively, for the above mentioned abdicating part, an abdicating part for the sewing machine feeding link rod to run may be arranged on the side of the presser foot lifting cam 22 close to the thread cutting crank 23, which is similar to the above mentioned abdicating part scheme and is shown in fig. 1 in detail. The above-mentioned drive motor 11 is preferably a stepping motor, which is advantageous for the control system of the sewing machine to perform control.

The adjusting wheel 21 has a needle pitch adjusting action surface 211, a positioning and presser foot action surface 212, a positioning and trimming action surface 213, a first transition surface 214 and a second transition surface 215, and the needle pitch adjusting action surface 211, the positioning and presser foot action surface 212, the positioning and trimming action surface 213, the first transition surface 214 and the second transition surface 215 of the adjusting wheel 21 jointly form a space for the circular oscillating member 31 to run in. In fig. 5, a first transition surface 214 and a second transition surface 215 are arranged on two sides of the needle pitch adjustment action surface 211, the first transition surface 214 is adjacent to the positioning and thread trimming action surface 213, the second transition surface 215 is adjacent to the positioning and presser foot action surface 212, the positioning and presser foot action surface 212 and the positioning and thread trimming action surface 213 are located between the first transition surface 214 and the second transition surface 215, and the positioning and presser foot action surface 212 and the positioning and thread trimming action surface 213 are located on the same circular arc surface. The adjusting wheel 21 further has a shaft hole 210 for mounting the output shaft 12, and the positioning and presser foot acting surface 212, the positioning and trimming acting surface 213 and the shaft hole 210 are arranged concentrically. The needle pitch adjusting action surface 211 is provided with a center line 2111, the center line 2111 is a zero-position needle pitch point of the sewing machine, and when the sewing machine is positioned on the center line 2111, the zero-needle pitch position of the feed dog is established for the zero-needle pitch positioning mechanism of the feed dog.

The needle pitch adjusting action of the needle pitch adjusting mechanism is carried out when the sewing machine does not carry out sewing action, the adjusting wheel 21 is driven by the driving motor 11, the adjusting wheel 21 acts on the circular swinging piece 31 on the swinging rod 41, and the circular swinging piece 31 runs in an inner wall space consisting of a needle pitch adjusting acting surface 211, a positioning and presser foot acting surface 212, a positioning and thread trimming acting surface 213, a transition surface I214 and a transition surface II 215, so that the acting point of the circular swinging piece 31 acting on the needle pitch adjusting acting surface 211 is changed and changed from the original acting point to a new acting point. The swing lever 41 is hinged to the connecting rod 51, and the connecting rod 51 is hinged to the swing seat 61, so that the original needle pitch of the swing seat 61 is changed by the angular rotation of the adjusting wheel 21, and a new needle pitch is formed. And the sewing machine which is successfully adjusted in the needle pitch sews according to the new needle pitch. The circular oscillating member 31 is rotatable and acts on the needle pitch adjusting action surface 211, and therefore, the circular oscillating member 31 can be preferably selected from bearings, so that the circular oscillating member and the needle pitch adjusting action surface operate more smoothly, noise is reduced, and the operation precision between components is improved. Most importantly, the circular swinging piece 31 runs on the inner wall of the needle pitch adjusting acting surface 211 to relatively reduce the friction between the needle pitch adjusting acting surface 211 and the needle pitch adjusting acting surface 212, the positioning and presser foot acting surface 213, the first transition surface 214 and the second transition surface 215 together form a space for the circular swinging piece 31 to run in the circular swinging piece, so that the noise generated by the running of the adjusting wheel 21 and the circular swinging piece 31 is relatively low during running, and the running performance of the sewing machine is improved.

The circular oscillating member 31 is fixed to the oscillating lever 41, and can be selectively fixed to a middle position of the oscillating lever 41. The circular oscillating piece 31 is provided with a positioning and rotating device to realize that one end of the oscillating rod 41 can rotate under the action of the circular oscillating piece 31, and the circular oscillating piece 31 moves up and down along with the inner wall of the adjusting wheel 21, so that one end of the movable oscillating rod 41 pushes the connecting rod 51 to move. The solution of positioning and rotating device for the circular oscillating piece 31 is: a support shaft 42 is provided at the other end of the circular oscillating member 31, and the support shaft 42 is provided to allow the oscillating lever 41 to rotate about the support shaft 42.

The circular swinging piece 31 between the connecting rod 51 and the supporting shaft 42 is provided with a downward elastic piece 43, one end of the elastic piece 43 is connected with the swinging rod 41, the other end of the elastic piece 43 is connected and fixed on a bracket 52 of the sewing machine or fixed on the machine body of the sewing machine, the arrangement direction of the elastic piece 43 can also be arranged in an upward direction, the technical effects of the two are the same, and the elastic piece 43 is preferably a spring. The circular swinging piece 31 and the swinging rod 41 swing up or down by taking the supporting shaft 42 as a rotating shaft, so that the original needle pitch is changed through the swinging seat 61 hinged by the connecting rod 51, a new needle pitch is formed, and the adjustment of the needle pitch is realized. It should be noted here that the length of the connecting rod 51 can be adjusted to change the stitch length, so that the sewing machine has a larger stitch length exceeding the factory setting of the original factory in the actual sewing process, and the length of the connecting rod 51 is changed to allow a larger adjustment space for the stitch length.

When the sewing machine finishes sewing, the actions of trimming and lifting the presser foot are required to be executed so as to finish all sewing work. The thread cutting crank 23 and the presser foot lifting cam 22 fixed on the output shaft 12 respectively execute thread cutting and presser foot lifting actions, and as the driving motor 11 drives the thread cutting crank 23 and the presser foot lifting cam 22, the adjusting wheel 21 is also driven simultaneously, and the positioning and presser foot acting surface 212 of the adjusting wheel 21 is a key component for avoiding power transmission to the circular swinging piece 31 when the output shaft 12 performs thread cutting and presser foot lifting actions, and the positioning and presser foot acting surface 212 is also a zero-needle-pitch positioning mechanism of the feed dog to realize the establishment of the zero-needle-pitch position of the feed dog.

When the sewing machine starts to carry out the actions of trimming and presser foot lifting, the adjusting wheel 21 rotates to enable the circular swinging piece 31 to reach the positioning and trimming acting surface 213 through the transition surface I214, the positioning and trimming acting surface 213 pushes the circular swinging piece 31 to indirectly enable the swinging seat 61 to be in a zero-needle-pitch state, so that the feed dog 66 is positioned at a feed dog zero-needle-pitch position at the moment, the feed dog zero-needle-pitch position of the feed dog 66 below the upper plane 67 of the needle plate of the sewing machine is positioned, and the adverse effect that the feed dog 66 hooks sewing materials due to the upper plane 67 of the needle plate at the high position is overcome. Here, the circular swinging member 31 passes through the swinging rod 41, the connecting rod 51 and the swinging seat 61, the swinging seat 61 is hinged by the crank 62, the crank 62 is fixed on the cloth feeding shaft 63, the other end of the cloth feeding shaft 63 is fixed with the cloth feeding tooth seat 64, the cloth feeding tooth seat 64 is connected with the cloth feeding tooth frame 65, the cloth feeding tooth 66 is fixed on the cloth feeding tooth frame 65, and the positioning and thread trimming acting surface 213 pushes the circular swinging member 31 to position the cloth feeding tooth 66 of the sewing machine at the cloth feeding tooth zero-pitch position below the upper plane 67 of the needle plate. When the thread trimming crank 23 and the presser foot lifting cam 22 are to perform the thread trimming operation and the presser foot lifting operation, once the circular oscillating member 31 enters the positioning and presser foot acting surface 212 to position the zero-gauge position of the feed dog, the positioning and presser foot acting surface 212 and the positioning and thread trimming acting surface 213 of the adjusting wheel 21 operate without pushing the circular oscillating member 31, the positioning and presser foot acting surface 212 and the circular oscillating member 31 idle, the oscillating rod 41 is in a stationary state at this time, and the driving motor 11 drives the output shaft 12 to perform the thread trimming operation and the presser foot lifting operation.

The circular oscillating member 31 described above acts on the positioning and presser foot acting surface 212 of the adjustment wheel 21, and the positioning and presser foot acting surface 212, the positioning and trimming acting surface 213, and the shaft hole 210 of the adjustment wheel 21 are arranged concentrically. Therefore, after the zero gauge position of the feed dog is positioned, when the thread cutting crank 23 and the presser foot lifting cam 22 successively perform the thread cutting operation and the presser foot lifting operation, the positioning and presser foot acting surface 212 and the positioning and thread cutting acting surface 213 of the adjusting wheel 21 operate without pushing the circular oscillating member 31, the positioning and presser foot acting surface 212 and the circular oscillating member 31 are idle, and the oscillating lever 41 is in a stationary state at this time.

First, when the circular oscillating piece 31 acts on the positioning and trimming acting surface 213, the trimming crank 23 starts to perform the trimming operation.

The thread trimming presser foot lifting mechanism is provided with a presser foot lifting cam 22, a presser foot lifting ejector rod 71, a presser foot lifting execution end 72, a thread trimming crank 23, a thread trimming fork wheel 81 and a thread trimming execution end 813, wherein the thread trimming crank 23 is fixed on the presser foot lifting cam 22. Wherein, the trimming crank 23 is provided with a pushing piece 231, and the pushing piece 231 is arranged at the tail end eccentric position of the trimming crank 23. The pushing member 231 pushes the trimming fork wheel 81 to realize the trimming action, the trimming fork wheel 81 is provided with a trimming return rod 811 and a trimming push rod 812, the pushing member 231 is arranged between the trimming return rod 811 and the trimming push rod 812, and the idle surface 221 is used for avoiding power and transmitting the power to the presser foot lifting ejector rod 71 when the driving motor 11 drives the adjusting wheel 21. When the driving motor 11 drives the thread cutting crank 23 on the output shaft 12, the pushing member 231 pushes the thread cutting pushing rod 812 so that the thread cutting execution end 813 executes a thread cutting action.

When the circular swinging member 31 acts on the positioning and presser foot acting surface 212 after the thread trimming operation is completed, the presser foot lifting cam 22 starts to perform the presser foot lifting operation.

The presser foot lifting cam 22 has a free rotation surface 221 and a presser foot lifting surface 222, and the free rotation surface 221 is used for avoiding the transmission of power to the presser foot lifting rod 71 when the drive motor 11 drives the adjusting wheel 21 of the output shaft 12. The presser foot lifting cam 22 is driven by the driving motor 11 to rotate in the direction of the presser foot lifting surface 222 from the state of being originally on the idle surface 221, the presser foot lifting cam 22 rotates to enable the presser foot lifting surface 222 to act on the presser foot lifting ejector rod 71, and the presser foot lifting execution end 72 enables the presser foot lifting surface 222 to abut against the highest point of the presser foot lifting surface 222 to be in the highest state of lifting the presser foot. At this time, the circular swinging member 31 is located at the presser foot lifting highest point 2121 of the positioning and presser foot acting surface 212, and reaches the presser foot lifting highest point 2112, that is, the presser foot lifting execution end 72 completes presser foot lifting.

After the trimming and the presser foot lifting are completed, the driving motor 11 drives the output shaft 12 to drive the trimming crank 23 to rotate continuously, so that the pushing member 231 acts on the trimming return rod 811 until the trimming return rod returns to the original position. At this time, the presser foot lifting cam 22 rotates from the presser foot lifting highest point 2121 back to the idle rotation surface 221 within a predetermined period of time, and the presser foot lowering and lifting operation is realized. The whole process of the thread trimming and presser foot lifting action is that the circular swinging piece 31 passes through the positioning and thread trimming action surface 213, the positioning and presser foot action surface 212 and the transition surface II 215 from the transition surface I214 in sequence, the driving motor 11 finishes the process of one-circle rotation, and the process is that the circular swinging piece 31 starts from the needle pitch adjusting action surface 211 and ends at the needle pitch adjusting action surface 211.

Here, there is another scenario. The circular swinging piece 31 can enter the positioning and presser foot acting surface 212 from the second transition surface 215 and reach the presser foot lifting highest point 2121, and after the presser foot lifting action is completed, the circular swinging piece 31 returns from the original path from the second transition surface 215; the corresponding presser foot lifting cam 22 rotates from the idle surface 221, so that the presser foot lifting surface 222 acts on the presser foot lifting push rod 71 to complete the presser foot lifting action, and after the presser foot lifting action is completed, the presser foot lifting cam 22 returns from the original path, and the sewing action of only lifting the presser foot without cutting the thread is suitable for the turning of the sewing stitch.

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 (9)

1. A driving mechanism of a sewing machine is provided with a driving motor, an adjusting wheel, a circular swinging piece, a swinging rod, a connecting rod, a swinging seat, a crank, a cloth feeding shaft, a cloth feeding tooth rack, a cloth feeding tooth seat and cloth feeding teeth, wherein the driving motor drives the adjusting wheel, the circular swinging piece acted on the swinging rod by the adjusting wheel, the swinging rod is hinged with the connecting rod, and the connecting rod is indirectly connected with the cloth feeding teeth through the swinging seat, the crank, the cloth feeding shaft, the cloth feeding tooth rack and the cloth feeding tooth seat.

2. The drive mechanism of a sewing machine according to claim 1, wherein the swing lever is provided with an upward-directed elastic member.

3. The driving mechanism of a sewing machine as claimed in claim 1, wherein the adjusting wheel is connected to a fixed lifting and pressing foot cam, and a thread cutting crank is fixed on the lifting and pressing foot cam.

4. The driving mechanism of sewing machine according to claim 3, wherein the adjusting wheel is installed on one side of the output shaft close to the driving motor, and the presser foot lifting cam is installed between the thread cutting crank and the adjusting wheel; a yielding part of the sewing machine for the feeding connecting rod to operate is arranged between the adjusting wheel and the presser foot lifting cam; or a yielding part for the sewing machine to operate the feeding connecting rod is arranged on one side of the presser foot lifting cam, which is close to the thread cutting crank.

5. The driving mechanism of sewing machine according to claim 4, wherein the thread cutting crank and the presser foot lifting cam fixed to the output shaft perform the thread cutting and the presser foot lifting actions, respectively, and the regulating wheel has a positioning and presser foot acting surface for preventing the output shaft from transmitting power to the circular oscillating member during the thread cutting and the presser foot lifting actions.

6. The driving mechanism of sewing machine according to claim 3, wherein the thread trimming crank has a pushing member for pushing the thread trimming fork wheel to perform the thread trimming operation, the thread trimming fork wheel has a thread trimming return lever and a thread trimming push lever, the pushing member is disposed between the thread trimming return lever and the thread trimming push lever, and the pushing member is disposed between the thread trimming return lever and the thread trimming push lever so as to avoid the power transmission to the thread trimming return lever or the thread trimming push lever when the driving motor drives the adjusting wheel.

7. The drive mechanism for a sewing machine of claim 6, wherein the pusher is disposed at an end of the thread cutting crank.

8. The driving mechanism of a sewing machine according to claim 3, wherein the presser foot lifting cam has an idle surface for avoiding power transmission to the presser foot lifting jack when the driving motor drives the adjustment wheel, and a presser foot lifting surface.

9. The drive mechanism of a sewing machine according to claim 1, wherein the circular oscillating member acts on a positioning and presser foot acting surface of the regulating wheel, and the positioning and presser foot acting surface, the positioning and thread cutting acting surface, and the shaft hole of the regulating wheel are arranged concentrically.

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