CN212955660U - Sewing machine - Google Patents

Abstract

The application provides a sewing machine, concretely relates to sewing machine makes technical field. The stitch length adjusting mechanism is characterized by comprising a power source, a backstitch stitch length adjusting mechanism and a presser foot lifting mechanism, wherein a main shaft of the power source is fixedly provided with a driving wheel and a presser foot cam I, the driving wheel of the backstitch stitch length adjusting mechanism acts on a grooved pulley to generate a swinging source, the presser foot cam I of the presser foot lifting mechanism directly/indirectly acts on a presser foot lifting ejector rod to carry out presser foot lifting action, and the driving wheel and the presser foot cam I rotate in respective backstitch stitch length adjusting rotation angle and presser foot lifting rotation angle along with the main shaft under the operation of the power source. The application carries out the adjustment of the backstitch needle distance and lifts the presser foot by utilizing a power source, so that the power source fully exerts the running efficiency, the programmed control of each sewing action is realized, the assembly efficiency is improved in the manufacturing process, the failure rate of the special power source of the whole machine is reduced, and the whole machine performance of the sewing machine is improved.

Description

Sewing machine

Technical Field

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

Background

The sewing machine on the existing market generally adopts a stepping motor to control a swing seat so as to realize the adjustment of the needle pitch, and respectively controls the actions of lifting a presser foot and cutting threads through the stepping motor or an electromagnet, the configuration of a plurality of motors causes the reduction of the power utilization rate of the whole sewing machine, meanwhile, the manufacturing assembly is complicated, the cost of the whole sewing machine is improved, the heat dissipation capacity of the sewing machine is larger due to the operation of the plurality of motors, the service life of the sewing machine is shortened, and the sewing machine for controlling the needle pitch and the presser foot through the stepping motor is developed aiming at the conditions so as to improve the working efficiency of the whole sewing machine and reduce the manufacturing cost.

Disclosure of Invention

The technical problem to be solved by the application is to provide a sewing machine which is provided with a power source, a backstitch needle distance adjusting mechanism and a presser foot lifting mechanism and is characterized in that a main shaft of the power source is fixedly provided with a driving wheel and a presser foot cam I, the driving wheel of the backstitch needle distance adjusting mechanism acts on a sheave to generate a swinging source, the presser foot cam I of the presser foot lifting mechanism directly/indirectly acts on a presser foot lifting ejector rod to perform a presser foot lifting action, and the driving wheel and the presser foot cam I operate in respective backstitch needle distance adjusting rotation angle and presser foot lifting rotation angle along with the main shaft under the operation of the power source. A power source is used for controlling the driving wheel and the presser foot cam, so that the sewing machine is more reasonable in design, and the mechanical transmission efficiency is greatly improved.

Preferably, the driving wheel rotates the swinging rod of the driving wheel to the inside of the limiting groove of the grooved wheel under the operation of the power source, and the swinging rod entering the limiting groove causes the grooved wheel to perform reciprocating swinging action under the reciprocating operation of the power source.

Preferably, the outer arc surface of the sheave is in cooperative transition with the concave sheave surface of the driving wheel under the swinging of the swinging rod, the outer arc surface of the sheave is not interfered with the concave sheave surface, and the cam action surface of the driving wheel is not interfered with the inner arc surface of the sheave.

Preferably, the swing rod is arranged on the same side of the abutting part, the swing rod is arranged on a central connecting line of the cam acting surface, the concave wheel surface and the swing rod, the outer diameter of the swing rod is slightly smaller than the groove width of the limiting groove, the cam acting surface is arranged on one side close to the presser foot cam by taking the main shaft as a concentric circle, and the concave wheel surface is arranged between the swing rod and the cam acting surface.

Preferably, the grooved pulley is movably connected and fixed on the fixed pin, the grooved pulley performs circumferential rotation and keeps an axial position under the action of the driving wheel, the grooved pulley is movably connected with the connecting rod, the grooved pulley drives the connecting rod to perform up-and-down reciprocating operation, and the connecting rod drives the swinging seat and the feeding shaft.

Preferably, a plurality of identical inner arc surfaces are uniformly distributed in the axial direction of the grooved pulley, an outer arc surface is arranged between two adjacent inner arc surfaces, the outer arc surfaces have the same shape, limiting grooves are distributed in the middle of the outer arc surface, the limiting grooves extend in the direction of the fixed pin in a mutually perpendicular mode, and a connecting sleeve movably connected with a connecting rod is further arranged on the grooved pulley.

Preferably, the driving wheel is arranged on one side of the main shaft close to the power source, and the first presser foot cam is arranged on one side of the main shaft close to the driving wheel.

Preferably, a driving wheel and a presser foot cam I are arranged on a main shaft of the power source and are arranged at two ends of the power source with a double-head output shaft.

Preferably, the power source drives the presser foot lifting cam to apply pressure to the presser foot lifting trimming swing rod in the presser foot lifting corner, the presser foot lifting trimming swing rod twists the presser foot rotating shaft, the presser foot rotating shaft drives the presser foot lifting cam to start rotating on the circular idle rotation surface II of the presser foot lifting cam, and the presser foot lifting cam action surface of the presser foot lifting cam lifts the presser foot lifting ejector rod.

Preferably, the presser foot rotating shaft is movably connected and fixed on the sewing machine, a first cam action surface of the presser foot lifting and trimming swing rod acts on a first presser foot cam, and the presser foot lifting mandril is movably arranged on the mandril fixing frame.

Compared with the prior art, the beneficial effects of this application are: this application is through utilizing a power supply to carry out the regulation of the backstitch needle distance and lift the presser foot for the power supply full play its operating efficiency, realized the programmed control of each sewing action, improve assembly efficiency in the manufacturing, reduced the trouble emergence of power supply, thereby make the sewing machine complete machine performance improve.

Drawings

FIG. 1 is an overall assembly view of a sewing machine of the present application;

FIG. 2 is a schematic view of a backstitch stitch length adjusting mechanism, a presser foot lifting mechanism and a thread trimming mechanism of a sewing machine according to the present application;

FIG. 3 is an assembly view of a drive wheel and a sheave of a sewing machine of the present application;

FIG. 4 is a view of a driving wheel of a sewing machine according to the present application;

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

FIG. 6 is a schematic view of a presser foot lifting and trimming swing link of a sewing machine according to the present application;

FIG. 7 is a schematic view of a presser foot cam of a sewing machine of the present application;

FIG. 8 is a schematic view of a trimming cam of a sewing machine of the present application;

FIG. 9 is a schematic view of a presser foot lifting cam of a sewing machine of the present application;

FIG. 10 is a schematic view of a thread trimmer line fork and a thread trimmer crank of a sewing machine of the present application;

FIG. 11 is a schematic view of a thread trimming rotating shaft and a power source of a sewing machine according to the present application.

The reference numbers are as follows: the device comprises a power source 10, a main shaft 11, a power source II 12, a back stitching needle distance adjusting mechanism 20, a driving wheel 21, a limiting part 211, a swing rod 212, a butting part 213, a cam action surface 214, a concave wheel surface 215, a connecting rod 22, a swing seat 23, a feeding shaft 24, a grooved wheel 25, a limiting groove 251, an inner arc surface 252, an outer arc surface 253, a connecting sleeve 254, a fixing pin 26, a presser foot cam I31, a circular idle surface I311, a cam part I312, a presser foot rotating shaft 32, a presser foot thread lifting and cutting swing rod 33, a shaft hole 331, a cam action surface I332, a presser foot lifting mechanism 40, a presser foot lifting cam 41, a circular idle surface II 411, a presser foot cam action surface 412, a presser foot lifting mandril 42, a mandril fixing frame 43, a presser foot end lifter 45, a thread trimming mechanism 50, a thread trimming cam 51, a cam part II 511, a circular idle surface III 512, a thread trimming rotating rod 52, a thread trimming rotating shaft 53, a, a cutting reset surface 542, a cutting crank 55, a rotating rod 551, and a cutting end actuator 56.

Detailed Description

The following detailed description of the preferred embodiments of the present application, taken in conjunction with the accompanying drawings, is provided to enable those skilled in the art to more readily understand the advantages and features of the present application, and is intended to more clearly and distinctly define the scope of the invention, which is set forth by way of illustration only and is not intended to be limiting of the invention.

Example one

In the drawings, a sewing machine of the present application has a power source 10, a backstitch stitch pitch adjusting mechanism 20, a presser foot lifting mechanism 40 and a thread trimming mechanism 50, and a main shaft 11 of the power source 10 sequentially controls the backstitch stitch pitch adjusting action of the backstitch stitch pitch adjusting mechanism 20, the thread trimming action of the thread trimming mechanism 50 and the presser foot lifting action of the presser foot lifting mechanism 40. The main shaft 11 is a power output shaft of the power source 10, the power source 10 is a power device with a rotating shaft for outputting, and the embodiment specifically selects a motor as the power source.

This application adopts a power supply 10 to control the regulation action of the backstitch stitch length, lift presser foot action and trimming action, has fully embodied the sewing machine of this application and has higher transmission efficiency, can reduce sewing machine's manufacturing cost simultaneously again. The driving wheel 21, the first presser foot cam 31 and the trimming cam 51 are mounted on the main shaft 11 of the power source 10, the driving wheel 21, the first presser foot cam 31 and the trimming cam 51 can be mounted on the same side of the main shaft 11, the driving wheel 21, the first presser foot cam 31 and the trimming cam 51 can also be selectively mounted at two ends of the power source 10 with the double-head output shaft, and the played technical effects are also the same.

The power source 10 firstly performs the adjustment of the backstitch needle distance, and the power source 10 rotates in the backstitch needle distance adjusting corner of the sewing machine, so that the driving wheel 21 generates a swinging source for the grooved wheel 25 to the swinging seat 23 to perform the adjustment of the backstitch needle distance. During the adjustment of the backstitch stitch pitch, the circular idle surface one 311 of the presser foot cam one 31 plays a role of not pushing the presser foot and thread lifting and trimming swing rod 33 when the power source 10 rotates, and simultaneously drives the thread trimming cam 51 to idle swing in the opposite direction close to the thread trimming rotating rod 52 under the rotation of the power source 10, so that the main shaft 11 does not influence the presser foot lifting and thread trimming actions when the adjustment of the backstitch stitch pitch is carried out.

After the power source 10 performs the backstitch stitch pitch adjustment operation within the backstitch stitch pitch adjustment corner, the power source 10 needs to move out of the backstitch stitch pitch adjustment corner and enter the thread cutting corner. The power source 10 drives the driving wheel 21 to rotate so as to enable the driving wheel 21 and the grooved pulley 25 to idle, the power source 10 drives the second cam part 511 of the trimming cam 51 to gradually apply pressure to the trimming rotating rod 52 until the tail end of the trimming is indirectly pressed 56 to generate pressure to implement trimming, meanwhile, the power source 10 drives the first circular idle rotating surface 311 of the first presser foot cam 31 to idle on the first cam action surface 332 of the presser foot trimming lifting swing rod 33, and therefore, in a trimming rotating angle, the power source 10 drives the main shaft 11 to rotate so as to drive the trimming cam 51 to not generate substantial thrust on the first presser foot cam 31.

After the thread trimming operation, the presser foot lifting operation is required, the power source 10 drives the presser foot pressing cam one 31 in the presser foot lifting corner and then indirectly drives the presser foot lifting cam action surface 412 of the presser foot lifting cam 41 to act on the presser foot lifting ejector rod 42 to realize the presser foot lifting operation, and at the moment, the power source 10 drives the circular idle rotation surface three 512 of the thread trimming cam 51 to idle with the thread trimming rotating rod 52.

In this embodiment, the backstitch stitch pitch adjusting angle is in the region of ± 45 °, the backstitch stitch pitch adjusting angle is moved out, the thread cutting angle of 46 ° to 80 ° is entered, and the rotation angle of the lift presser foot after the thread cutting angle is 81 ° to 140 °.

Specifically, the main shaft 11 is fixedly provided with a driving wheel 21, a presser foot cam I31 and a thread trimming cam 51. The difference is that the power source 10 actually pushes the driving wheel 21, the presser foot cam one 31 and the thread cutting cam 51 idle and do not produce actual sewing actions, and the driving wheel 21 directly produces a swinging source for the grooved pulley 25. In the aspect of program control, the power source 10 makes a back-and-forth rotation at the back-and-forth sewing needle distance adjusting corner to drive the driving wheel 21 to generate a swinging source to execute back-and-forth sewing needle distance adjustment, and after the back-and-forth sewing needle distance adjustment is completed, the power source 10 needs to enter a thread cutting corner and lift a presser foot corner from the back-and-forth sewing needle distance adjusting corner to execute thread cutting and presser foot lifting actions. The driving wheel 21 is arranged on one side of the main shaft 11 close to the power source 10, the presser foot cam I31 is arranged on one side of the main shaft 11 close to the driving wheel 21, and the thread trimming cam 51 is arranged at the outer end of the main shaft 11.

The backstitch needle pitch adjusting mechanism 20 comprises a power source 10, a driving wheel 21, a connecting rod 22, a swinging seat 23, a feeding shaft 24, a grooved wheel 25 and a fixing pin 26. The sheave 25 has a limiting groove 251, inner arc surfaces 252 and outer arc surfaces 253, and the specific sheave 25 has a plurality of limiting grooves 251, a plurality of inner arc surfaces 252 and a plurality of outer arc surfaces 253, the same plurality of inner arc surfaces 252 are uniformly distributed in the axial direction of the sheave 25, each outer arc surface 253 is arranged between two adjacent inner arc surfaces 252, and the outer arc surfaces 253 have the same shape. The plurality of limiting grooves 251 are disposed and distributed in the middle of the plurality of outer arc surfaces 253, and the plurality of limiting grooves 251 extend in the direction of the fixing pin 26 in a mutually perpendicular manner.

In this embodiment, the sheave 25 is movably connected and fixed to the fixing pin 26, so that the sheave 25 performs a circumferential rotation and maintains an axial position under the action of the driving wheel 21, and the fixing pin 26 is fixed to the sewing machine head. The grooved pulley 25 is movably connected with the connecting rod 22, the grooved pulley 25 drives the connecting rod 22 to perform up-and-down operation, and the up-and-down operation connecting rod 22 drives the swinging seat 23 and the feeding shaft 24 to realize the adjustment of the backstitch needle distance. The grooved pulley 25 is also provided with a connecting sleeve 254 movably connected with the connecting rod 22, and the connecting sleeve 254 is arranged to enable the connecting rod 22 to drive the swinging seat 23 to move up and down until the feeding shaft 24 moves up and down under the rotation of the grooved pulley 25 so as to realize needle pitch control.

The driving wheel 21 has a limit part 211 and an abutting part 213, the abutting part 213 has a cam acting surface 214 and a concave wheel surface 215, the cam acting surface 214 is arranged on the side close to the presser foot cam 31 with the main shaft 11 as a concentric circle, and the concave wheel surface 215 is arranged between the swing lever 212 and the cam acting surface 214. The swing rod 212 is positioned on the central connecting line of the cam action surface 214, the concave wheel surface 215 and the swing rod 212, and the outer diameter of the swing rod 212 is slightly smaller than the groove width of the limiting groove 251, so that the swing rod 212 can freely push the grooved wheel 25 under the stress of the limiting groove 251. The swing lever 212 enters the stopper groove 251 in accordance with the operation of the power source 10, and the outer arc surface 253 is displaced adjacent to the concave cam surface 215 when the backstitch distance is adjusted.

The driving wheel 21 rotates the swinging rod 212 to the inside of the limiting groove 251 under the operation of the power source 10, the swinging rod 212 can only closely cling to the limiting groove 251 to operate in the limiting groove 251, and the swinging rod 212 entering the limiting groove 251 causes the grooved wheel 25 to do reciprocating swinging motion under the rotation of the power source 10; at this time, the outer arc surface 253 of the sheave 25 cooperatively transitions with the concave sheave surface 215 under the swing of the swing lever 212, and the outer arc surface 253 and the concave sheave surface 215 do not interfere with each other. In the embodiment of the present application, to realize the adjustment of the backstitch needle pitch, to make the driving wheel 21 rotate to drive the grooved pulley 25, the grooved pulley 25 needs to be rotated back and forth to meet the requirement of the adjustment of the backstitch needle pitch, therefore, when the swing seat 23 is parallel to the plane of the sewing machine head, the swing rod 212 is located on the center line of the connecting line of the grooved pulley surface 215, the adjustment of the needle pitch is the adjustment of the rotation angle of the operation of the power source 10, for example, the driving wheel 21 drives the grooved pulley 25 to start the operation of the power source 10 in the forward and reverse directions at the zero position, and the needle pitch value of the operation is set to be ± 5 needle pitches.

Specifically, after the adjustment of the backstitch stitch length is completed at the backstitch stitch length adjustment corner, the power source 10 needs to enter the thread cutting corner and the presser foot lifting corner successively to perform the thread cutting and presser foot lifting actions, and then the thread cutting and presser foot lifting actions are performed sequentially, wherein the thread cutting corner and the presser foot lifting corner are located below the running corner of the backstitch stitch length adjustment corner. The presser foot cam one 31 of the presser foot lifting mechanism 40 directly/indirectly acts on the presser foot lifting ejector rod 42, the power source 10 drives the cam part two 511 of the thread trimming cam 51 to act on the thread trimming rotating rod 52 in the thread trimming rotation angle, the thread trimming rotating rod 52 drives the thread trimming rotating shaft 53, the thread trimming rotating shaft 53 drives the thread trimming crank 55 to rotate, the thread trimming crank 55 pushes the thread trimming fork wheel 54 to rotate until the thread trimming tail end is driven to execute 56 to execute thread trimming action, and simultaneously drives the presser foot cam one 31, however, the circular idle rotation surface one 311 of the presser foot cam one 31 and the cam idle rotation surface one 332 of the presser foot lifting thread trimming oscillating rod 33 form idle rotation, and the power source 10 drives the main shaft 11 to generate no substantial thrust on the presser foot lifting cam 41 in the thread trimming rotation angle.

The thread cutting fork wheel 54 has a thread cutting action surface 541 and a thread cutting reset surface 542, the thread cutting crank 55 has a rotating rod 551, the thread cutting crank 55 has the rotating rod 551 to apply a rotating force to the thread cutting action surface 541 to perform thread cutting under the indirect driving of the power source 10 of the thread cutting crank 55, and the rotating rod 551 operates to push the thread cutting reset surface 542 to forcibly reset the thread cutting fork wheel 54 under the continuous driving operation of the power source 10.

Specifically, after the trimming operation, the presser foot lifting operation needs to be performed immediately, and the power source 10 starts to perform the operation from the starting point of the presser foot lifting corner to the foot placing operation. The power source 10 drives the presser foot lifting cam I31 to apply pressure to the presser foot lifting trimming swing rod 33 in the presser foot lifting corner, the presser foot cam I31 is further provided with a cam part I312, the presser foot lifting trimming swing rod 33 is further provided with a cam action surface I332, the cam part I312 of the presser foot cam I31 is formed to apply pressure to the cam action surface I332 of the presser foot lifting trimming swing rod 33, the presser foot lifting trimming swing rod 33 is enabled to twist the presser foot rotating shaft 32, the presser foot rotating shaft 32 drives the presser foot lifting cam 41 to rotate at the position of the circular idle rotation surface II 411, the presser foot lifting cam action surface 412 of the presser foot lifting cam 41 jacks the presser foot lifting ejector rod 42, and the presser foot lifting ejector rod 42 performs the presser foot lifting action by using the presser foot lifting tail end execution 45. The presser foot lifting rod 42 is movable on the rod fixing frame 43, and during this period, the circular idle surface three 512 of the thread trimming cam 51 and the thread trimming rotating rod 52 idle, so that no substantial thrust is generated on the presser foot cam one 31, and the thread trimming mechanism 50 is not moved during the presser foot lifting operation.

The presser foot cam I31 abuts against the presser foot lifting and trimming swing rod 33, the presser foot lifting and trimming swing rod 33 with the shaft hole 331 is fixed on the presser foot rotating shaft 32, one end of the presser foot rotating shaft 32 is fixedly connected with the presser foot lifting and trimming swing rod 33, the other end of the presser foot rotating shaft 32 is fixedly connected with the presser foot lifting cam 41, the presser foot rotating shaft 32 is fixedly connected on the sewing machine in a movable mode, the presser foot rotating shaft 32 can be axially twisted to drive the presser foot lifting cam 41, and a cam action surface I332 of the presser foot lifting and trimming swing rod 33 acts on the presser foot cam.

Example two

The second embodiment is substantially the same as the first embodiment, except that the main shaft 11 of the present embodiment is fixed with the driving wheel 21 and the thread trimming cam 51, and the present embodiment realizes that the main shaft 11 performs the backstitch stitch pitch adjusting action and the thread trimming action under the driving of the power source 10, and the technical effect is also the same as that of the first embodiment.

EXAMPLE III

The third embodiment is basically the same as the first embodiment, except that the main shaft 11 of the present embodiment is fixed with the driving wheel 21 and the presser foot cam first 31, so that the main shaft 11 of the present embodiment is driven by the power source 10 to perform the backstitch stitch length adjusting action and the presser foot lifting action, and the technical effect is also the same as that of the first embodiment.

Example four

Referring to fig. 11, the present embodiment is substantially the same as the first embodiment, except that the main shaft 11 of the present embodiment is fixed with the driving wheel 21 and the presser foot cam 31, but the second power source 12 is installed on the above-mentioned thread cutting rotating shaft 53, and the second power source 12 for controlling the sewing machine still has a thread cutting rotation angle, but is executed by a different power source, and the technical effects are also the same as those of the first embodiment.

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 power source (10), a backstitch needle distance adjusting mechanism (20) and a presser foot lifting mechanism (40), and is characterized in that a main shaft (11) of the power source (10) is fixedly provided with a driving wheel (21) and a presser foot cam I (31), the driving wheel (21) of the backstitch needle distance adjusting mechanism (20) acts on a grooved wheel (25) to generate a swinging source, the presser foot cam I (31) of the presser foot lifting mechanism (40) directly/indirectly acts on a presser foot lifting ejector rod (42) to perform a presser foot lifting action, and the driving wheel (21) and the presser foot cam I (31) follow the main shaft (11) to operate in respective backstitch needle distance adjusting rotation angle and presser foot lifting rotation angle under the operation of the power source (10).

2. The sewing machine of claim 1, wherein the driving wheel (21) rotates a swinging rod (212) of the driving wheel (21) to the inside of a limiting groove (251) of the grooved wheel (25) under the operation of the power source (10), and the swinging rod (212) of the limiting groove (251) causes the grooved wheel (25) to perform reciprocating swinging motion under the reciprocating operation of the power source (10).

3. A sewing machine according to claim 2, wherein the sheave (25) has an outer arc surface (253) that cooperates with a concave wheel surface (215) of the drive wheel (21) in transition with the oscillation of the oscillating lever (212), the sheave (25) has an outer arc surface (253) that does not interfere with the concave wheel surface (215), and the drive wheel (21) has a camming surface (214) that does not interfere with an inner arc surface (252) of the sheave (25).

4. The sewing machine according to claim 3, wherein the swing lever (212) is disposed on the same side of the abutting portion (213), the swing lever (212) is disposed on a central connecting line of the cam acting surface (214), the cam surface (215) and the swing lever (212), an outer diameter of the swing lever (212) is slightly smaller than a groove width of the limiting groove (251), the cam acting surface (214) is disposed on a side close to the presser foot cam I (31) with the main shaft (11) as a concentric circle, and the cam surface (215) is disposed between the swing lever (212) and the cam acting surface (214).

5. The sewing machine of claim 2, wherein the sheave (25) is movably connected and fixed to a fixed pin (26), the sheave (25) rotates circumferentially and maintains an axial position under the action of the driving wheel (21), the sheave (25) is movably connected to the connecting rod (22), the sheave (25) drives the connecting rod (22) to reciprocate up and down, and the connecting rod (22) drives the swinging seat (23) and the feeding shaft (24).

6. The sewing machine according to claim 2, characterized in that a plurality of identical inner arc surfaces (252) are uniformly distributed in the axial direction of the sheave (25), an outer arc surface (253) is arranged between two adjacent inner arc surfaces (252), the outer arc surfaces (253) have identical shapes, a limiting groove (251) is distributed in the middle of the outer arc surface (253), the limiting grooves (251) extend in the direction of the fixed pin (26) in a mutually perpendicular manner, and a connecting sleeve (254) for dynamically connecting the connecting rod (22) is further arranged on the sheave (25).

7. The sewing machine of claim 1, wherein the drive wheel (21) is mounted on a side of the main shaft (11) adjacent to the power source (10), and the presser foot cam one (31) is mounted on a side of the main shaft (11) adjacent to the drive wheel (21).

8. The sewing machine of claim 1, wherein the main shaft (11) of the power source (10) is provided with a driving wheel (21) and a presser foot cam (31) mounted at both ends of the power source (10) with a double-ended output shaft.

9. The sewing machine according to claim 1, wherein the power source (10) drives the presser foot cam I (31) to apply pressure to the presser foot thread lifting and trimming swing rod (33) within a presser foot lifting corner, the presser foot thread lifting and trimming swing rod (33) twists the presser foot rotating shaft (32), the presser foot rotating shaft (32) drives the presser foot lifting cam (41) to start rotating on the circular idle rotation surface II (411) of the presser foot lifting cam, and the presser foot lifting cam action surface (412) of the presser foot lifting cam (41) lifts the presser foot lifting ejector rod (42).

10. The sewing machine of claim 9, wherein the presser foot shaft (32) is movably connected and fixed on the sewing machine, the presser foot lifting and trimming swing rod (33) has a first cam action surface (332) acting on the presser foot cam (31), and the presser foot lifting mandril (42) is movably arranged on the mandril fixing frame (43).

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