A sewing machine

Abstract

The sewing machine of the application relates to the technical field of sewing machine manufacturing, and comprises a driving source. The driving source is used to replace the non-swinging seat to not only adjust the stitch length adjusting mechanism but also position the zero point of the feed dog. The sewing machine is characterized in that it further comprises a second driving source and a thread cutting and presser foot lifting area. The driving source idles or stays in the thread cutting and presser foot lifting area, while the second driving source actually performs the thread cutting and presser foot lifting actions. The structure is convenient to assemble, simple and compact, reduces the manufacturing difficulty and cost, and improves the working efficiency of the sewing machine. The sewing machine breaks the design concept of the traditional sewing machine and has high popularization and application value.

Description

TECHNICAL FIELD

[0001] The sewing machine provided by the present application relates to the technical field of sewing machine manufacturing. BACKGROUND

[0002] The swing seat, the stitch length adjusting mechanism, the thread trimming mechanism and the presser foot lifting mechanism are important components in the traditional sewing machine structure and are indispensable for completing the sewing work. The swing seat is installed between the connecting rod and the feed shaft crank. In order to ensure the correspondence between the backstitch length and the forward stitch length, the stitch length adjusting function and the automatic backstitch function are realized by adjusting the angle of the swing seat. The stitch length adjusting of the swing seat is one of its important functions. The stitch length adjusting part adjusts the angle of the swing seat in the front and back directions by rotating the stitch length dial to drive the feed stud, so as to realize the change of the stitch length. In the automatic stitch length adjusting prevailing in recent period, the automatic backstitch part drives the swing seat to swing to a certain angle by the automatic backfeed magnet to realize the backstitch. Since the limiting of the backstitch length is realized by the collision between the working surface of the adjuster and the head of the feed stud, the contact part of the stud and the feed adjuster is severely worn after a long time of use, which causes the abnormal stitch length and affects the sewing effect. Meanwhile, the noise of the swing seat during work is also large. At present, the stitch length adjusting mechanism, the thread trimming mechanism and the presser foot lifting mechanism are installed on the output shaft of the motor. The cams or working wheels of the three mechanisms are very compactly installed inside the sewing machine body. However, the assembly space of the sewing machine is limited, which leads to high assembly difficulty of the parts. This puts forward higher requirements on the manufacturing precision of the parts. SUMMARY

[0003] In view of the problems of high manufacturing precision requirement of the sewing machine parts, limited assembly space and high assembly difficulty, the present application provides a sewing machine, which comprises a driving source, characterized in that it further comprises a driving source two and a thread trimming and presser foot lifting area. The driving source idles or stays in the thread trimming and presser foot lifting area, and at the same time, the driving source two actually performs the thread trimming action and the presser foot lifting action.

[0004] Preferably, the thread trimming and presser foot lifting area is arranged on the stitch length adjusting and positioning groove of the static positioning wheel. The stitch length adjusting and positioning groove is a closed groove. The stitch length adjusting and positioning groove further comprises a stitch length adjusting groove and transition grooves one and two located between the stitch length adjusting groove and the thread trimming and presser foot lifting area.

[0005] Preferably, the driving source two has a thread trimming operating angle. The driving source two actually performs the thread trimming action within the thread trimming operating angle. The driving source two has a presser foot lifting operating angle. The driving source two actually performs the presser foot lifting action within the presser foot lifting operating angle.

[0006] Preferably, the thread trimming operating angle and the presser foot lifting operating angle are the same. The thread trimming and presser foot lifting area and the output shaft of the driving source are arranged in concentric circles.

[0007] Preferably, the driving source is installed on the side body of the sewing machine, the driving source two is installed under the base of the sewing machine, the driving source and the driving source two use stepping motor or servo motor, and the driving source and the driving source two are electrically connected to the control system.

[0008] Preferably, the driving source two has an output shaft two, and the driving source two drives the presser foot mechanism and the thread trimming mechanism at different times through the output shaft two.

[0009] Preferably, the thread trimming mechanism has a thread trimming crank, a thread trimming fork wheel and a thread trimming end, the presser foot mechanism has a presser foot slot wheel, a presser foot top rod and a presser foot end, the thread trimming crank and the presser foot slot wheel are installed on the output shaft two, the thread trimming crank is located at the front end of the driving source two, and the presser foot slot wheel is located at the rear end of the driving source two.

[0010] Preferably, the thread trimming crank is provided with a pusher at an eccentric position, the thread trimming fork wheel has a return rod and a thread trimming rod, and the pusher is located between the return rod and the thread trimming rod.

[0011] Preferably, the presser foot slot wheel has a front top rod abutting point, a rear top rod abutting point and a presser foot highest point, the front top rod abutting point and the rear top rod abutting point are used for abutting against the presser foot top rod, the front top rod abutting point to the rear top rod abutting point is in the shape of a circular arc groove, and the presser foot highest point is located at the highest point of the circular arc.

[0012] Preferably, the presser foot top rod drives the presser foot slot wheel from the front top rod abutting point to the presser foot highest point to be one presser foot action under the driving of the driving source two, and the presser foot top rod drives the presser foot end to perform the presser foot action, and the presser foot top rod returns to the front top rod abutting point from the presser foot highest point to be one presser foot releasing action.

[0013] Preferably, the front top rod abutting point to the presser foot highest point corresponds to reverse operation of the driving source two on the return rod during the thread trimming action, and the driving source two completes one presser foot action on the presser foot slot wheel when the return rod is reset after the thread trimming.

[0014] Preferably, after the presser foot action is completed, the presser foot top rod returns to the front top rod abutting point or the rear top rod abutting point from the front top rod abutting point.

[0015] Compared with the prior art, the application has the beneficial effects that the sewing machine of the application does not provide a swing seat, and a driving source is used to replace the swing seat, so that the needle spacing adjusting mechanism can be adjusted, and the zero positioning mechanism can be positioned to the position of the feed dog. The driving source is driven without lubricating the related parts, and the working efficiency of the sewing machine is improved. In addition, the installation positions of the needle spacing adjusting mechanism, the thread cutting mechanism and the presser foot lifting mechanism of the sewing machine are different from those of the sewing machines on the market. The driving source two is used to drive the thread cutting and presser foot lifting actions, so that the assembly is convenient, the structure is more compact, and the manufacturing difficulty and cost are reduced. The sewing machine of the application breaks the design concept of the traditional sewing machine, and has high popularization and application value. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic view of the structure of the sewing machine of the application;

[0017] Figure 2 is a schematic view of the zero positioning mechanism (needle spacing adjusting mechanism) of the sewing machine of the application;

[0018] Figure 3 is an exploded schematic view of the adjusting driving wheel and the static positioning wheel of the sewing machine of the application;

[0019] Figure 4 is a schematic view of the structure of the adjusting driving wheel of the sewing machine of the application;

[0020] Figure 5 is a schematic view of the structure of the static positioning wheel of the sewing machine of the application;

[0021] Figure 6 is a schematic view of the thread cutting mechanism and the presser foot lifting mechanism of the sewing machine of the application;

[0022] Figure 7 is a schematic view of the structure of the presser foot lifting cam wheel of the sewing machine of the application.

[0023] The driving source 10, the output shaft 11, the static positioning wheel 21, the through hole 211, the needle spacing adjusting and positioning groove 212, the needle spacing adjusting groove 2121, the thread cutting and presser foot lifting area 2122, the transition groove one 2123, the transition groove two 2124, the adjusting driving wheel 31, the sliding groove 311, the shaft groove hole 312, the sliding part 313, the annular step 314, the shaft hole 315, the sliding block 41, the fork-shaped lever 42, the socket 421, the supporting pin 43, the connecting rod 44, the crank 45, the feed shaft 46, the feed dog holder 47, the feed dog 48, the needle plate 49, the presser foot lifting cam wheel 51, the front top rod abutting point 511, the rear top rod abutting point 512, the highest point of the presser foot 513, the presser foot lifting lever 52, the thread cutting crank 61, the pushing part 611, the thread cutting fork wheel 62, the return lever 621, the thread cutting lever 622, the driving source two 70, and the output shaft two 71. Detailed Implementation

[0024] The following is in conjunction with the appendix Figures 1-7 The preferred embodiments of this application are described in detail so that the advantages and features of this application can be more easily understood by those skilled in the art, thereby making a clearer and more explicit definition of the scope of protection of this application. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0025] exist Figures 1-5 The application presented describes a sewing machine. The sewing machine includes a drive source 10, a second drive source 70, a zero-positioning mechanism, a presser foot lifting mechanism, a thread cutting mechanism, a stitch length adjustment mechanism, and a control system. Drive source 10 has an output shaft 11, which drives the zero-positioning mechanism and the stitch length adjustment mechanism at different times. Drive source 70 has an output shaft 71, which drives the presser foot lifting mechanism and the thread cutting mechanism at different times. Drive source 10 and drive source 70 are electrically connected to the control system. Drive source 10 is mounted on the side of the sewing machine body, and drive source 70 is mounted under the base of the sewing machine.

[0026] The sewing machine of this application can operate normally even without a swing seat. Specifically, the sewing machine uses drive source 10 to rotate and adjust the stitch length of the stitch length adjustment mechanism; drive source 10 performs a zero-position positioning action on the feed dog 48 of the zero-position positioning mechanism; and drive source 70 performs a presser foot lifting action of the presser foot lifting mechanism and a thread cutting action of the thread cutting mechanism.

[0027] Referring to the attached drawings, the stitch length adjustment mechanism includes a drive source 10, a stationary positioning wheel 21, an adjusting wheel 31, a connecting rod 44, a slider 41, a feed shaft 46, a fork-shaped lever 42, a feed dog 48, a feed dog holder 47, and a support pin 43. The stationary positioning wheel 21 is fixed to the sewing machine body and remains stationary while performing its zero-position positioning and stitch length adjustment functions. The output shaft 11 of the drive source 10 passes through a through hole 211 in the stationary positioning wheel 21, which is located inside the stitch length adjustment and positioning groove 212. The stationary positioning wheel 21 is fixed to the side of the machine body using screws. The stationary positioning wheel 21 is fixed to the side of the output shaft 11 closest to the drive source 10. The adjusting wheel 31 is located outside the stationary positioning wheel 21, creating a state where the output shaft 11 rotates inside the through hole 211 of the stationary positioning wheel 21, driving the adjusting wheel 31. The through hole 211 of the aforementioned stationary positioning wheel 21 and the output shaft 11 are arranged in concentric circles.

[0028] The above-mentioned needle positioner 21 has a needle pitch adjustment and positioning groove 212 which is a closed groove having a needle pitch adjustment groove 2121, a thread trimming and presser foot lifting area 2122, and transition grooves 2123 and 2124 between the needle pitch adjustment groove 2121 and the thread trimming and presser foot lifting area 2122. The transition grooves 2123 and 2124 serve to transition between the needle pitch adjustment groove 2121 and the thread trimming and presser foot lifting area 2122. The thread trimming and presser foot lifting area 2122 is used to perform a presser foot lifting action or a thread trimming action by the second driving source 70 after the feed dog 48 is positioned at the zero position.

[0029] The output shaft 11 of the driving source 10 is further provided with an adjustment wheel 31 and a slider 41. The slider 41 is fixed to the output shaft 11, and in this embodiment, the slider 41 is fixed to the output shaft 11 by a small screw at the center hole thereof. The slider 41 is located outside the needle positioner 21 and in a sliding groove 311 on the adjustment wheel 31. The sliding groove 311 is provided at the center of the adjustment wheel 31 and is used for the sliding of the slider 41 when the adjustment wheel 31 rotates.

[0030] The adjustment wheel 31 is further provided with an axle slot hole 312, a sliding member 313, and an axle hole 315. The axle hole 315 is located at the center of the adjustment wheel 31, and the sliding member 313 slides in different running grooves inside the needle pitch adjustment and positioning groove 212 to indirectly act on the feed dog 48 by pushing the adjustment wheel 31, wherein the needle pitch adjustment groove 2121 is used for needle pitch adjustment. The axle hole 315 is used for the accommodation of the running output shaft 11 at the center of the adjustment wheel 31. The axle slot hole 312 is long strip-shaped and extends to the edge from the position of the axle hole 315, and the axle hole 315 overlaps the axle slot hole 312. The output shaft 11 occupies the axle slot hole 312 during running, and the axle slot hole 312 is used for the avoidance of the running output shaft 11 when the adjustment wheel 31 rotates. The sliding member 313 is provided on the sliding groove 311 and is located at the eccentric position of the adjustment wheel 31. The sliding member 313 is higher than the adjustment wheel 31 and extends into the needle pitch adjustment and positioning groove 212 of the needle positioner 21, and is passively running in the needle pitch adjustment groove 2121 of the needle pitch adjustment and positioning groove 212.

[0031] The above-mentioned adjustment wheel 31 is movably connected inside the fork-shaped lever 42, the fork-shaped lever 42 is hinged with the connecting rod 44, the crank 45 is fixedly connected with the feed dog shaft 46, and the feed dog shaft 46 is connected with the feed dog 48 through the feed dog holder 47. The fork-shaped lever 42 has a socket 421 which is inserted into the annular step 314 of the adjustment wheel 31 in the shape of the socket 421. The socket 421 cooperates with the annular step 314, and the gap fit exists between the socket 421 and the annular step 314.

[0032] The application also has a support pin 43 fixed on the sewing machine body and static. The fork-shaped lever 42 has a positioning hole passing through the support pin 43, and a movable device is arranged between the fork-shaped lever 42 and the support pin 43. The fork-shaped lever 42 can rotate around the support pin 43 as the rotating shaft. In the embodiment, the fork-shaped lever 42 is movably connected to the support pin 43 by a snap spring.

[0033] The driving source 10 drives the slider 41 through the output shaft 11. The slider 41 rotates and pushes the sliding piece 313 to change the acting position on the stitch length adjusting groove 2121, so that the annular step 314 of the adjusting gear 31 generates a position changing pushing force on the fork-shaped lever 42. The changed fork-shaped lever 42 indirectly meets the new stitch length sewing requirement of the feed dog 48, realizes the stitch length adjustment of the driving source 10, and removes the traditional swing seat technology of the sewing machine. On the one hand, the intelligent control level of the stitch length adjustment is improved, and on the other hand, the manufacturing cost of the sewing machine is greatly reduced, which has high technical expansibility.

[0034] One end of the connecting rod 44 is hinged to the fork-shaped lever 42. The adjusting gear 31 drives the fork-shaped lever 42 and the connecting rod 44 to generate a swing source in a back-and-forth rotating driving mode driven by the driving source 10, so as to realize the stitch length adjustment action and the zero position positioning action. Specifically, the connecting rod 44 is hinged at the socket 421 of the fork-shaped lever 42. During the stitch length adjustment action, the driving source 10 drives the sliding piece 313 on the stitch length adjusting groove 2121 in a continuous back-and-forth rotating driving mode. The adjusting gear 31 and the fork-shaped lever 42 and the connecting rod 44 make continuous swing action, so as to achieve the sewing work of the feed dog 48 at a new stitch length. The change of the acting position between the sliding piece 313 and the stitch length adjusting groove 2121 to realize the new stitch length is determined by the size of the back-and-forth rotating angle of the driving source 10. The feed dog 48 finally sews at a new stitch length. Therefore, the sewing machine of the application can realize the multiple adjustment of the stitch length by setting a reasonable length of the stitch length adjusting groove 2121.

[0035] The driving source 10 implements the above-mentioned stitch length adjustment and the feed dog zero position positioning in different time periods and different operating angles, and achieves the technical purpose of adjusting the stitch length and positioning the zero position of the driving source 10. The above-mentioned feed dog zero position positioning is that the feed dog is in the zero stitch length state below the needle plate 49, thereby avoiding the influence of the feed dog 48 on the sewing material due to the feed dog 48 being higher than the needle plate 49. The driving source 10 and the driving source two 70 preferably use a stepping motor or a servo motor in the present scheme. In combination with the drawings, the above-mentioned zero position positioning mechanism includes the driving source 10, the static positioning wheel 21, the adjusting driving wheel 31, the connecting rod 44, the sliding block 41, the feed shaft 46, the fork-shaped shifting lever 42, the feed dog 48, the feed dog frame 47, and the support pin 43. The sliding member 313 of the adjusting driving wheel 31 slides in each different operating groove in the stitch length adjustment and positioning groove 212 to push the adjusting driving wheel 31, and indirectly acts on the feed dog 48. The thread trimming and presser foot lifting area 2122 of the static positioning wheel 21 is used for positioning the zero position of the feed dog 48.

[0036] When the sewing machine needs to perform the zero position positioning action, the sliding member 313 passes through the transition groove one 2123 or the transition groove two 2124 from the stitch length adjustment groove 2121 to the thread trimming and presser foot lifting area 2122. When the sliding member 313 enters the thread trimming and presser foot lifting area 2122 from the transition groove one 2123 or the transition groove two 2124, the zero position of the feed dog 48 is indirectly determined as soon as the sliding member 313 enters the thread trimming and presser foot lifting area 2122. The sliding member 313 pushes the feed shaft 46 through the fork-shaped shifting lever 42 and the connecting rod 44 to make the feed dog 48 enter the zero position. At this time, the thread trimming and presser foot lifting area 2122 is arranged as a concentric circle with the output shaft 11, the sliding block 41 is driven under the driving of the output shaft 11, the sliding member 313 pushes the shaft groove hole 312 on the adjusting driving wheel 31 to be located at the center position of the adjusting driving wheel 31, and the sliding member 313 indirectly pushes the fork-shaped shifting lever 42 until the feed dog 48, thereby effectively determining the zero position and solving the problem of inaccurate zero position positioning of the existing sewing machine.

[0037] In the zero position positioning action, the driving source 10 indirectly rotates the sliding member 313 into the thread trimming and presser foot lifting area 2122, the adjusting driving wheel 31 pushes the fork-shaped shifting lever 42, so that the connecting rod 44, the feed shaft 46, and the feed dog 48 are in a relatively static state, and the feed dog 48 is positioned at the zero position. The feed dog 48 in the zero position below the needle plate 49 can effectively avoid the influence of the feed dog 48 on the sewing material due to the feed dog 48 being higher than the needle plate 49, improve the stability of sewing, and thereby improve the sewing quality.

[0038] In addition, since the fork-shaped lever 42 is in clearance fit with the annular step 314 of the regulating gear 31, the position of the connecting rod 44 and the regulating gear 31 is mutually constrained, the reliable mechanical connection between the regulating gear 31 and the connecting rod 44 improves the reliability and stability of the position positioning of the feed dog 48 and the stitch length adjustment, and overcomes the defect of low stability in positioning in the prior art.

[0039] In addition, after the slide 313 performs new stitch length in the stitch length adjustment groove 2121, the driving source 10 continues to drive the slide 313 to run to the thread trimming and presser foot lifting area 2122, and the slide 313 gives the fork-shaped lever 42, the connecting rod 44 and the feed dog shaft 46 no swing source transmission. The driving source 10 drives the output shaft 11 to drive the regulating gear 31 to idle in the fork-shaped lever 42, that is, to realize the positioning of the zero position of the feed dog 48, at this time, the sewing machine commands the driving source two 70 in the thread trimming and presser foot lifting area 2122 to perform the presser foot lifting action of the presser foot lifting mechanism and the thread trimming action of the thread trimming mechanism.

[0040] Referring to the drawings Figure 6 And Figure 7 The sewing machine also comprises a driving source two 70, a presser foot lifting mechanism and a thread trimming mechanism. When the sewing machine finishes sewing, it needs to perform thread trimming action first and then perform presser foot lifting action to finish all the sewing work. The driving source two 70 and the driving source 10 both have a presser foot lifting running angle and a thread trimming running angle, the driving source two 70 performs the presser foot lifting action in the presser foot lifting running angle, and the driving source two 70 performs the thread trimming action in the thread trimming running angle.

[0041] The thread trimming mechanism has a thread trimming crank 61, a thread trimming fork wheel 62 and a thread trimming end execution end, and the presser foot lifting mechanism has a presser foot lifting groove wheel 51, a presser foot lifting top rod 52 and a presser foot lifting end execution end. The thread trimming crank 61 and the presser foot lifting groove wheel 51 are installed on the output shaft two 71, the thread trimming crank 61 is located at the front end of the driving source two 70, and the presser foot lifting groove wheel 51 is located at the rear end of the driving source two 70.

[0042] When the driving source two 70 actually performs the line cutting action and the presser foot lifting action in the line cutting and presser foot lifting area 2122, the driving source two 70 is synchronously operated with the driving source 10, and the driving source 10 idles in the line cutting and presser foot lifting area 2122, in which another state coexists, i.e. the driving source 10 is in a stationary state in the line cutting and presser foot lifting area 2122, while the actual line cutting action and the presser foot lifting action are driven by the driving source two 70 to be completed. When the driving source 10 idles in the line cutting and presser foot lifting area 2122, the above-mentioned driving source 10 and the driving source two 70 have the same running angle, and the driving source 10 does not produce a pushing action on the adjusting wheel 31 and the fork-shaped lever 42 in the idle state; when the driving source 10 is in the stationary state in the line cutting and presser foot lifting area 2122, there is no running angle. In other words, the output shaft 11 of the driving source 10 is located in the shaft hole 315 in the center of the adjusting wheel 31, and no matter how the output shaft 11 operates, the adjusting wheel 31 is always in the idle state in the insertion hole 421 of the fork-shaped lever 42, and does not produce a pushing action on the adjusting wheel 31 and the fork-shaped lever 42; the sliding piece 313 of the adjusting wheel 31 idles passively in the line cutting and presser foot lifting area 2122, or the driving source 10 is stationary in the entire line cutting and presser foot lifting area 2122, while the driving source two 70 completes the presser foot lifting action and the line cutting action.

[0043] The eccentric position of the line cutting crank 61 is provided with a pushing piece 611, the line cutting fork wheel 62 has a return rod 621 and a line cutting rod 622, and the pushing piece 611 is located between the return rod 621 and the line cutting rod 622. The driving source two 70 drives the pushing piece 611 to rotate and press down the line cutting rod 622 to transmit the line cutting force to the line cutting end execution end to complete the line cutting action by the line cutting end execution end. After the line cutting is completed, the driving source two 70 reversely operates the pushing piece 611 to release the line cutting rod 622, and the return rod 621 returns to the original position in turn to complete the reset of the entire line cutting mechanism and complete the line cutting action.

[0044] After the thread cutting is completed, the sewing machine immediately performs the presser foot lifting action. The driving source 2 70 drives the presser foot lifting groove 51 at the presser foot lifting angle. The presser foot lifting groove 51 has a front top rod abutting point 511, a rear top rod abutting point 512 and a presser foot highest point 513. The front top rod abutting point 511 and the rear top rod abutting point 512 are used to abut the presser foot lifting rod 52. The front top rod abutting point 511 to the rear top rod abutting point 512 is a circular arc shaped groove. The presser foot highest point 513 is located at the highest point of the circular arc. When the presser foot lifting rod 52 is driven by the driving source 2 70 to drive the presser foot lifting groove 51 from the front top rod abutting point 511 to the presser foot highest point 513, it is a presser foot lifting action. The presser foot lifting rod 52 causes the presser foot lifting end to perform the presser foot lifting action. From the presser foot highest point 513 back to the front top rod abutting point 511 is a presser foot lowering action. The above-mentioned front top rod abutting point 511 to the presser foot highest point 513 corresponds to the driving source 2 70 acting on the return rod 621 in the reverse direction during the thread cutting action. In other words, after the thread cutting, the driving source 2 70 returns the return rod 621, and the driving source 2 70 naturally completes a presser foot lifting action on the presser foot lifting groove 51.

[0045] After the presser foot lifting action is completed, the presser foot lifting rod 52 can return from the front top rod abutting point 511 to the front top rod abutting point 511, or to the rear top rod abutting point 512.

[0046] The above-mentioned is only one of the preferred embodiments of the present application, and does not limit the patent implementation scope of the present application. Any equivalent structure or equivalent process transformation using the shape, structure and principle of the contents of the present application, or direct or indirect application in other related technical fields, is covered by the patent protection scope of the present application.

Claims

1. A sewing machine characterized by comprising: The driving source has an output shaft, the driving source drives the zero-position positioning mechanism and the stitch length adjusting mechanism at different times through the output shaft, the driving source two has an output shaft two, the driving source two drives the presser foot lifting mechanism and the thread trimming mechanism at different times through the output shaft two; The stitch length adjusting mechanism comprises a driving source, a static positioning wheel, and an adjusting driving wheel, a connecting rod, a sliding block, a feed shaft, a fork-shaped shifting lever, a feed tooth, a feed tooth holder, and a supporting pin, the static positioning wheel is fixed on the sewing machine body, and is fixed and static under the function of zero-position positioning stitch length adjustment, the static positioning wheel has a stitch length adjusting positioning groove, the stitch length adjusting positioning groove is a closed groove, the stitch length adjusting positioning groove has a stitch length adjusting groove, a thread trimming presser foot lifting area, and transition grooves one and two between the stitch length adjusting groove and the thread trimming presser foot lifting area, the output shaft of the driving source is further provided with the adjusting driving wheel and the sliding block, the sliding block is fixed on the output shaft, the sliding block is located outside the static positioning wheel and in a sliding groove on the adjusting driving wheel, the sliding groove is arranged at the center position of the adjusting driving wheel, the adjusting driving wheel is connected to the inside of the fork-shaped shifting lever, the fork-shaped shifting lever is hinged to the connecting rod, the crank is fixedly connected to the feed shaft, the feed shaft is connected to the feed tooth through the feed tooth holder, the fork-shaped shifting lever has a socket, the fork-shaped shifting lever is inserted into a ring-shaped step of the adjusting driving wheel in the shape of the socket, the socket and the ring-shaped step are in a clearance fit relationship, the fork-shaped shifting lever has a positioning hole penetrating through the supporting pin, the fork-shaped shifting lever is rotatable around the supporting pin as the rotating shaft, and the supporting pin is fixed on the sewing machine body and is static, the output shaft of the driving source penetrates through a through hole of the static positioning wheel, the through hole is located in the inside of the stitch length adjusting positioning groove, the static positioning wheel is fixed on the output shaft near the driving source side, the adjusting driving wheel is located outside the static positioning wheel, forming a state that the output shaft operates in the through hole of the static positioning wheel to drive the adjusting driving wheel to work, and the through hole of the static positioning wheel and the output shaft are arranged as concentric circles; The driving source idles or stays in the thread trimming presser foot lifting area at the same time, and the driving source two actually performs thread trimming and presser foot lifting actions.

2. The sewing machine of claim 1, wherein The driving source two has a thread trimming operation angle, and the driving source two actually performs thread trimming action in the thread trimming operation angle, the driving source two has a presser foot lifting operation angle, and the driving source two actually performs presser foot lifting action in the presser foot lifting operation angle.

3. The sewing machine of claim 1, wherein The driving source is installed on the side body of the sewing machine, the driving source two is installed under the base of the sewing machine, the driving source and the driving source two are step motors or servo motors, and the driving source and the driving source two are electrically connected to the control system.

4. The sewing machine of claim 1, wherein The thread trimming mechanism has a thread trimming crank, a thread trimming fork wheel, and a thread trimming end execution end, the presser foot lifting mechanism has a presser foot lifting groove wheel, a presser foot lifting top rod, and a presser foot lifting end execution end, the thread trimming crank and the presser foot lifting groove wheel are installed on the output shaft two of the driving source two, the thread trimming crank is located at the front end of the driving source two, and the presser foot lifting groove wheel is located at the rear end of the driving source two, the driving source two drives the presser foot lifting mechanism and the thread trimming mechanism at different times through the output shaft two.

5. A sewing machine according to claim 4, wherein The eccentric position of the thread trimming crank is provided with a pushing piece, the thread trimming fork wheel has a return rod and a thread trimming rod, and the pushing piece is located between the return rod and the thread trimming rod.

6. A sewing machine according to claim 5, wherein The presser foot lifting groove wheel has a front top rod abutting point, a rear top rod abutting point and a presser foot highest point, the front top rod abutting point and the rear top rod abutting point are used for abutting against the presser foot top rod, the front top rod abutting point to the rear top rod abutting point is a circular-arc-shaped groove, and the presser foot highest point is located at the highest point of the circular arc.

7. A sewing machine according to claim 6, wherein The presser foot top rod is driven by the second driving source to lift the presser foot groove wheel from the front top rod abutting point to the presser foot highest point, which is a presser foot lifting action, and the presser foot top rod promotes the presser foot tail end to perform the presser foot lifting action; the presser foot top rod returns to the front top rod abutting point from the presser foot highest point, which is a presser foot releasing action.

8. A sewing machine according to claim 7, wherein The front top rod abutting point to the presser foot highest point corresponds to the reverse operation of the second driving source on the return rod when the cutting line action is performed; after the second driving source cuts the line, the second driving source returns the return rod, and a presser foot lifting action is completed on the presser foot lifting groove wheel; after the presser foot lifting action is completed, the presser foot top rod returns to the front top rod abutting point or the rear top rod abutting point from the front top rod abutting point.

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