A sewing machine with needle length adjustment and zero position positioning of swing seat

Abstract

The present invention proposes a sewing machine with stitch length adjustment and zero-position positioning of a swing seat, specifically relating to the technical field of sewing machine manufacturing, comprising a driving source, a connecting rod, and a swing seat, characterized in that it also comprises an adjusting wheel and a slider, wherein the driving source drives the slider on the output shaft to indirectly position the swing seat at zero, and the slider is arranged on a slide groove of the adjusting wheel, the adjusting wheel is connected to the connecting rod, and the connecting rod is hinged to the swing seat. The present application has the characteristics of high accuracy in positioning the zero point of the swing seat, the static positioning wheel is fixed and equipped with an adjusting wheel to make the operation more stable, the gap between the various components is small after positioning, the degree of mechanical wear of the various components is small, and the noise is relatively low, which has the advantages of stable operation and high promotion and use value.

Description

Technical Field

[0001] The present invention provides a sewing machine with stitch length adjustment and zero position positioning of a swing seat, which particularly relates to the technical field of sewing machine manufacturing. Background Art

[0002] The swing base of a sewing machine is a key component for adjusting stitch length and determining the zero position. Existing patented technologies propose a sewing machine with a zero-position positioning function, comprising a drive motor, a driving wheel, a stitch lever, a stitch adjustment connecting rod, and a swing base. The drive motor drives the driving wheel to act on the swing base via the stitch lever and stitch adjustment connecting rod. The driving wheel has a stitch adjustment and zero-position positioning wheel. The drive motor drives the stitch adjustment and zero-position positioning wheel to push a sliding member on the stitch lever into the feed dog zero-position positioning groove on the stitch adjustment and zero-position positioning wheel. The sliding member indirectly acts on the swing base, causing the swing base to be in the zero position state. The stitch length adjustment and zero position positioning wheel has a return-to-zero position transition groove 1 and a return-to-zero position transition groove 2. The sliding part enters the feed dog zero position positioning groove from the return-to-zero position transition groove 1 or the return-to-zero position transition groove 2. The sliding part entering the feed dog zero position positioning groove is the feed dog zero position of the sewing machine. The stitch length adjustment and zero position positioning wheel, driven by the drive motor, pushes the sliding part and the stitch length adjustment groove of the stitch length adjustment and zero position positioning wheel to change the working position, and then changes the original swing angle of the swing seat through the stitch length lever and the stitch length adjustment connecting rod. The application discloses a sewing machine with a zero position positioning function. The beneficial effect is that the drive motor drives the cam, and the cam then drives the rotating rod, so that the sewing machine can perform the stitch length adjustment action in the stopped state. Because the driving wheel is installed on the driving motor and rotates with the rotation of the motor, the above solution puts forward high requirements on the processing and installation accuracy of the driving wheel, which makes the zero position positioning of the sewing machine swing seat inaccurate, affecting the sewing quality. Summary of the Invention

[0003] In view of the defect of inaccurate positioning in the zero point positioning technology of the above-mentioned sewing machine, a sewing machine with stitch length adjustment and positioning of the swing seat zero position is specially provided, which includes a driving source, a connecting rod and a swing seat, and is characterized in that it also has an adjusting wheel and a slider. The driving source drives the slider on the output shaft to indirectly perform the swing seat zero position positioning. The slider is set on the slide groove of the adjusting wheel. The adjusting wheel is connected to the connecting rod, and the connecting rod is hinged to the swing seat.

[0004] Preferably, it also includes a driving source and a swing seat zero position positioning mechanism, the swing seat zero position positioning mechanism includes a static positioning wheel, a fork-shaped shift rod, a connecting rod, a slider and a cloth feed shaft, the static positioning wheel is fixed, the driving source has an output shaft that passes through the static positioning wheel and is fixedly installed with a slider, the slide is set at the center position of the adjusting moving wheel, the slide is provided with an axial slot hole and an axial hole, the axial slot hole is shaped like a long inner hole, the axial hole is connected to the axial slot hole, the static positioning wheel has a stitch length adjustment and positioning groove, and the slide is also provided with a sliding part, the sliding part is higher than the adjusting moving wheel and extends to the inside of the positioning groove of the stitch length adjustment and positioning groove, the fork-shaped shift rod has a socket clearance that is inserted on the annular step of the adjusting moving wheel, the fork-shaped shift rod is hinged to the connecting rod, and the connecting rod is hinged to the swing seat.

[0005] Preferably, the stitch length adjustment and positioning groove also has transition groove one and transition groove two, the sliding member is arranged at the longitudinal center position of the sliding groove and at the eccentric position of the adjusting wheel, the sliding member enters the positioning groove from transition groove one or transition groove two, the positioning groove and the output shaft are arranged in concentric circles, and the shaft hole is connected to the shaft slot hole.

[0006] Preferably, the swing seat has a short swing bar and a long swing bar, and the upper planes of the short swing bar and the long swing bar are in a parallel state or a coplanar state under the indirect action of the sliding member.

[0007] Preferably, the stitch length adjustment and positioning groove of the static positioning wheel also has a stitch length adjustment groove, and the output shaft of the driving source drives the slider at the original operating angle to drive the sliding part to change the working position on the stitch length adjustment groove. There is a connecting rod connection between the fork-shaped shift lever and the swing seat, and a new stitch length is formed by changing the working position between the sliding part and the stitch length adjustment groove.

[0008] Preferably, the driving source is fixed on a side of the sewing machine body; / or the driving source is fixed on the back of the body, and the driving source uses a stepping motor or a servo motor.

[0009] Preferably, the static positioning wheel is fixed to the side of the machine body with screws, and the static positioning wheel is fixed to the side of the output shaft close to the driving source.

[0010] Preferably, the through hole of the static positioning wheel and the output shaft are arranged in concentric circles, the stitch length adjustment and positioning groove is a closed groove, and the through hole is located inside the stitch length adjustment and positioning groove.

[0011] Preferably, the sewing machine also has a presser foot lifting mechanism and a thread trimming mechanism. After the sliding member enters the stitch length adjustment slot to locate the zero point position of the swing seat, the driving source drives the output shaft to drive the adjusting wheel to idle in the socket of the fork-shaped lever. At this time, the driving source continues to operate, and the sliding member gives the fork-shaped lever, the connecting rod and the swing seat a non-swinging source transmission. At this time, the sewing machine commands the driving source to execute the presser foot lifting action of the presser foot lifting mechanism and the thread trimming action of the thread trimming mechanism.

[0012] Preferably, the driving source has a needle length adjustment operating angle, a swing seat zero position positioning operating angle, a presser foot lifting operating angle and a thread trimming operating angle. Each sewing action is performed at its own angle, and each operating angle does not interfere with each other. The driving source drives the output shaft to implement the needle length adjustment, swing seat zero position positioning, presser foot lifting and thread trimming actions in different time periods and at different operating angles.

[0013] Preferably, the thread trimming mechanism comprises a thread trimming crank, a thread trimming fork wheel and a thread trimming terminal. A pushing member is provided at the deflected position of the thread trimming crank, the thread trimming fork wheel comprises a return rod and a thread trimming rod, the pushing member is located between the return rod and the thread trimming rod, the driving source drives the pushing member to rotate and press the thread trimming rod downward to transmit the force to the thread trimming terminal to cut the thread, and the thread trimming action is completed by the thread trimming terminal. After the thread trimming is completed, the driving source continues to drive the pushing member to rotate to the return rod, and the return rod is returned to its original position, completing the entire thread trimming mechanism at the same time. Reset; the presser foot lifting mechanism comprises a presser foot lifting cam, a presser foot lifting push rod and a presser foot lifting terminal. The driving source drives the presser foot lifting cam at the presser foot lifting running angle. The arc surface of the presser foot lifting cam is an idle surface, and the cam surface of the presser foot lifting cam is a lifting surface for the presser foot lifting action. The driving source drives the output shaft to rotate the presser foot lifting cam to lift the presser foot lifting push rod, and the presser foot lifting push rod finally causes the presser foot lifting terminal to perform the presser foot lifting action. The thread trimming crank and the presser foot lifting cam are installed on the output shaft, and the thread trimming crank is located at the outermost side of the output shaft.

[0014] Compared with the prior art, the sewing machine with needle length adjustment and positioning of the swing seat zero position in the present application has the characteristics of high accuracy in positioning the zero point position of the swing seat. The static positioning wheel is fixed and equipped with an adjusting dynamic wheel to make the operation more stable. After positioning, the gap between each component is small, the mechanical wear of each component is small, and the noise is relatively low, which has the advantage of stable operation. The driving source of the present application preferably uses a stepper motor or a servo motor, so that the driving source can be smoothly realized under the intelligent control program of the sewing machine, and has a high promotion and use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of a sewing machine with needle length adjustment and zero position positioning of a swing seat in the present application;

[0016] Figure 2This is a schematic diagram of a zero-position positioning mechanism for a sewing machine swing seat with stitch length adjustment and positioning of the swing seat at zero position;

[0017] Figure 3 This is a schematic diagram of a sewing machine with a stitch length adjustment and a zero position positioning swing seat and an adjusting wheel and an output shaft;

[0018] Figure 4 This is a schematic diagram of the connection between the adjusting wheel, fork-shaped lever and connecting rod of a sewing machine with stitch length adjustment and zero position positioning of a swing seat in the present application;

[0019] Figure 5 This is a schematic diagram of the structure of a sewing machine adjusting wheel with stitch length adjustment and zero position positioning of a swing seat;

[0020] Figure 6 This is a structural diagram of a sewing machine static positioning wheel with stitch length adjustment and zero position positioning of a swing seat;

[0021] Figure 7 The present invention is a schematic diagram of a slideway of a static positioning wheel of a sewing machine with stitch length adjustment and a zero position positioning swing seat.

[0022] Reference numerals: sewing machine 10, machine body 11, screw 12, driving source 20, output shaft 21, swing seat zero position positioning mechanism 40, static positioning wheel 41, through hole 411, stitch length adjustment and positioning groove 412, adjusting driving wheel 42, slide groove 421, stitch length adjustment groove 4121, positioning groove 4122, transition groove 1 4123, transition groove 2 4124, shaft slot hole 422, sliding member 423, annular step 4 24, shaft hole 425, swing seat 43, short swing bar 431, long swing bar 432, connecting rod 44, slider 45, cloth feed shaft 46, fork-shaped lever 47, socket 471, support pin 48, presser foot lifting mechanism 50, thread trimming mechanism 60, pushing member 611, presser foot lifting push rod 52, thread trimming fork wheel 62, thread trimming crank 61, presser foot lifting cam 51, return rod 621, thread trimming rod 622, stitch length adjustment 80. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-7 The preferred embodiments of the present application are described in detail so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present application. These embodiments are only used to illustrate the present invention and are not intended to limit the present invention.

[0024] Figure 1 Figure 2The present application proposes a general structural diagram of a sewing machine with stitch length adjustment and positioning of a swing seat zero position. The sewing machine 10 includes a driving source 20, a stitch length adjustment 80, a swing seat zero position positioning mechanism 40, a presser foot lifting mechanism 50, and a thread trimming mechanism 60. The driving source 20 has an output shaft 21 that is installed and drives the stitch length adjustment 80, the swing seat zero position positioning mechanism 40, the presser foot lifting mechanism 50, and the thread trimming mechanism 60. The sewing machine 10 of the present application can not only adjust the stitch length of the stitch length adjustment 80 under the drive of the driving source 20, and simultaneously position the swing seat zero position positioning mechanism 40, but also can perform the presser foot lifting action of the presser foot lifting mechanism 50 and the thread trimming action of the thread trimming mechanism 60 under the same drive of the driving source 20. The driving source 20 performs the sewing actions of the above four mechanisms respectively in different time periods and different operating angles, so as to achieve the technical purpose of positioning the swing seat zero point under a stable structure. The driving source 20 is fixed on the side of the body 11 of the sewing machine 10, or the driving source 20 is fixed on the back surface of the body 11. In this solution, the driving source 20 is preferably a stepping motor or a servo motor.

[0025] Combine Figures 1 to 7 The swing seat zero position positioning mechanism 40 includes a static positioning wheel 41, an adjustment wheel 42, a swing seat 43, a connecting rod 44, a slider 45, a cloth feed shaft 46, a fork-shaped lever 47, and a support pin 48. The static positioning wheel 41 is fixed and is static when it is functioning. The output shaft 21 of the drive source 20 passes through the through hole 411 of the static positioning wheel 41, and the static positioning wheel 41 is fixed to the side of the machine body 11. The specific fixing method is to fix the static positioning wheel 41 with screws 12. The static positioning wheel 41 is fixed to the side of the output shaft 21 close to the drive source 20, thereby forming a state in which the output shaft 21 rotates inside the through hole 411 of the static positioning wheel 41.

[0026] The through hole 411 of the static positioning wheel 41 is concentrically arranged with the output shaft 21. The static positioning wheel 41 has a stitch adjustment and positioning groove 412, which is a closed groove. The through hole 411 is located inside the stitch adjustment and positioning groove 412. The stitch adjustment and positioning groove 412 comprises a stitch adjustment groove 4121, a positioning groove 4122, and a first transition groove 4123 and a second transition groove 4124 located between the stitch adjustment groove 4121 and the positioning groove 4122. The stitch adjustment groove 4121 is used for stitch adjustment, the positioning groove 4122 is used to locate the swing seat at zero position, and the first transition groove 4123 and the second transition groove 4124 serve as a transition between the stitch adjustment groove 4121 and the positioning groove 4122.

[0027] The output shaft 21 is also provided with an adjusting wheel 42 and a slider 45, wherein the slider 45 is fixed to the output shaft 21. In this embodiment, the slider 45 is fixed to the output shaft 21 with a small screw at its center hole. The slider 45 is located outside the static positioning wheel 41. A slide groove 421 is provided at the center position of the above-mentioned adjusting wheel 42, and a slider 45 is provided to match the internal gap of the slide groove 421, and the slide groove 421 is used for the sliding of the slider 45; an axis slot hole 422, a sliding member 423 and an axis hole 425 are provided on the adjusting wheel 42, and the axis slot hole 422 is located at the center position of the adjusting wheel 42. The axis slot hole 422 is shaped like a long inner hole and penetrates the adjusting wheel 42. The axis slot hole 422 extends to the edge at the center position of the adjusting wheel 42, and the output shaft 21 passes through the axis slot hole 422. The axis slot hole 422 is used to avoid the running output shaft 21 when the adjusting wheel 42 rotates; the axis hole 425 is located at the center position of the adjusting wheel 42, and is used for the output shaft 21 to operate at the center position of the adjusting wheel 42. The axis hole 425 is connected to the axis slot hole 422. The slider 423 is disposed on the slide groove 421 of the adjusting wheel 42 and is located eccentrically of the adjusting wheel 42. The slider 423 is higher than the adjusting wheel 42 and extends into the stitch length adjustment and positioning groove 412 of the static positioning wheel 41. The slider 423 is restricted in operation within the stitch length adjustment groove 4121 of the stitch length adjustment and positioning groove 412. Under the operation of the slider 45, the slider 423 slides within the various operating grooves within the stitch length adjustment and positioning groove 412 to push the adjusting wheel 42, which in turn generates different swing sources for the connecting rod 44 and its swing seat 43.

[0028] The adjusting wheel 42 is rotatably connected to a fork-shaped lever 47, which is hinged to the connecting rod 44. The fork-shaped lever 47 has a socket 471. The fork-shaped lever 47 is inserted into the annular step 424 of the adjusting wheel 42, with the socket 471 resting on the annular step 424. There is a clearance fit between the socket 471 and the annular step 424. When the drive source 20 drives the slider 45 via the output shaft 21, the slider 45 rotates and pushes the sliding member 423 in the slot 421, causing the entire adjusting wheel 42 to move along with the slider 45 within the stitch length adjustment and positioning slot 412. The support pin 48 is fixed to the body 11 and is static. The fork-shaped lever 47 has a positioning hole that passes through the support pin 48. A movable device is provided between the fork-shaped lever 47 and the support pin 48. The fork-shaped lever 47 is rotatable on the support pin 48. In this embodiment, the fork-shaped lever 47 is movably connected to the support pin 48 by a retaining spring.

[0029] The other end of the connecting rod 44 is hinged to the swing seat 43, which is indirectly hinged to the cloth feed shaft 46 via a swing output. The operation of the adjusting wheel 42 drives the fork-shaped lever 47 and connecting rod 44 to generate a swing source, thereby implementing stitch length adjustment and swing seat zero position positioning (the two actions differ only in the position of the sliding groove 421 and the slider 423). Furthermore, the operation of the adjusting wheel 42 can keep the fork-shaped lever 47 and connecting rod 44 in a relatively static state. When the connecting rod 44 does not apply thrust to the swing seat 43, the drive source 20 can use this to lift the presser foot or trim the thread.

[0030] The driving source 20 has a needle length adjustment operating angle, a swing seat zero position positioning operating angle, a presser foot lifting operating angle and a thread trimming operating angle. The needle length adjustment and swing seat zero position positioning, the presser foot lifting action and the thread trimming action are all performed by the driving source 20 according to the preset operating angle. Each sewing action is performed at its own angle, and each operating angle is performed at a different time. In addition, the various operating angles do not interfere with each other, and each action is clear and distinct.

[0031] The stitch length adjustment and positioning groove 412 comprises a stitch length adjustment groove 4121, a positioning groove 4122, and a transition groove 1 4123 and a transition groove 2 4124 located between the stitch length adjustment groove 4121 and the positioning groove 4122. The stitch length adjustment groove 4121 is used for stitch length adjustment, and the positioning groove 4122 is used for zero position positioning of the swing seat and is also used for presser foot lifting or thread trimming.

[0032] When the sewing machine 10 is to adjust the stitch length, the output shaft 21 of the drive source 20 drives the slider 45 at the original operating angle, driving the slider 423 to rotate, thereby rotating and changing the active position of the slider 423 on the stitch length adjustment slot 4121. The drive source 20 drives the slider 45 to indirectly adjust the stitch length of the swing seat 43 via the fork-shaped shift lever 47 and the connecting rod 44, thereby adjusting the stitch length of the sewing machine 10. The fork-shaped shift lever 47 and the connecting rod 44 connect the adjustment wheel 42 and the swing seat 43 to transmit the rotation angle. The change in the active position between the slider 423 and the stitch length adjustment slot 4121 causes the swing angle of the swing seat 43 to change, thereby forming a new stitch length. The swing seat 43 then indirectly transmits the changed actual swing angle to the feed dog of the sewing machine via the feed shaft 46, and the feed dog ultimately sews at the new stitch length.

[0033] When the sewing machine 10 is to perform the zero-position positioning of the swing seat, the slider 423 enters the positioning slot 4122 from the stitch length adjustment slot 4121 through the transition slot 1 4123 or the transition slot 2 4124. When the slider 423 enters the positioning slot 4122 from the transition slot 1 4123 or the transition slot 2 4124, that is, as soon as the slider 423 enters the positioning slot 4122, the swing seat zero position is determined. The slider 423 pushes the swing seat 43 into the zero-position state via the fork-shaped shifting lever 47 and the connecting rod 44. At this time, since the positioning slot 4122 is concentric with the output shaft 21, the slider 45, driven by the output shaft 21, causes the slider 423 to push the output shaft 21 within the shaft slot hole 422 of the adjusting wheel 42 to be located at the center of the adjusting wheel 42. The swing base 43 comprises a short swing bar 431 and a long swing bar 432. Specifically, under the indirect action of the slider 423, the upper surfaces of the short swing bar 431 and the long swing bar 432 are parallel or coplanar. At this point, the swing base 43 indirectly forces the feed dog to a zero stitch position via the feed shaft 46, effectively deactivating the feed dog's forward and backward feed force. Therefore, the interaction between the slider 423 and the stitch adjustment slot 4121 determines the zero-point position of the swing base. This zero-point position determination effectively resolves the issue of inaccurate zero-position positioning in existing sewing machines, improving sewing stability and thus enhancing sewing quality.

[0034] When the zero point position of the swing seat is positioned, since there is a clearance fit between the socket 471 of the fork-shaped lever 47 and the annular step 424 of the adjusting wheel 42, the positions of the connecting rod 44 and the adjusting wheel 42 are mutually constrained, and the reliable mechanical connection between the adjusting wheel 42 and the connecting rod 44 is realized, thereby realizing the reliability of the zero point position positioning of the swing seat and overcoming the defect of low stability during positioning in the prior art.

[0035] After the slider 423 enters the stitch length adjustment slot 4121 and locates the swing seat at the zero point, the slider 423 continues to remain in the stitch length adjustment slot 4121. At this time, the drive source 20 continues to operate, and the slider 423 transmits a non-swinging source to the fork-shaped shift lever 47, the connecting rod 44, and the swing seat 43. The drive source 20 drives the output shaft 21 to drive the adjustment wheel 42 to rotate idly within the socket 471 of the connecting rod 44. At this time, the sewing machine 10 instructs the drive source 20 to perform the presser foot lifting action of the presser foot lifting mechanism 50 and the thread trimming action of the thread trimming mechanism 60.

[0036] With reference to the accompanying drawings, Figure 2 The present invention relates to a sewing machine with a swing seat zero position, comprising a presser foot lifting mechanism 50 and a thread trimming mechanism 60. When the sewing machine 10 finishes sewing, it is necessary to perform thread trimming before performing the presser foot lifting action. The driving source 20 performs the presser foot lifting action at the presser foot lifting operation angle and performs the thread trimming action at the thread trimming operation angle.

[0037] The thread trimming mechanism 60 comprises a thread trimming crank 61, a thread trimming fork wheel 62, and a thread trimming terminal. The presser foot lifting mechanism 50 comprises a presser foot lifting cam 51, a presser foot lifting push rod 52, and a presser foot lifting terminal. The thread trimming crank 61 and presser foot lifting cam 51 are mounted on the output shaft 21, with the thread trimming crank 61 located at the outermost side of the output shaft 21, and the presser foot lifting cam 51 located between the adjusting wheel 42 and the thread trimming crank 61 on the side closest to the adjusting wheel 42.

[0038] When the drive source 20 is performing the thread trimming operation at the thread trimming operating angle, the output shaft 21 is located at the center of the adjusting wheel 42. Regardless of how the output shaft 21 rotates, the adjusting wheel 42 is always in an idle state in the socket 471 of the fork-shaped lever 47. The entire length of the positioning groove 4122 is sufficient to allow the drive source 20 to perform the presser foot lifting operation and the thread trimming operation at the presser foot lifting operating angle and the thread trimming operating angle.

[0039] A pusher 611 is provided at an eccentric position of the trimming crank 61. The trimming fork wheel 62 has a return rod 621 and a trimming rod 622. The pusher 611 is located between the return rod 621 and the trimming rod 622. The driving source 20 drives the pusher 611 to rotate and press the trimming rod 622 downward to transmit the force to the trimming end actuator to trim the thread, and the trimming end actuator completes the thread trimming action. After the thread trimming is completed, the driving source 20 continues to drive the pusher 611 to rotate to the return rod 621, returning the return rod 621 to its original position, thereby completing the reset of the entire trimming mechanism 60.

[0040] After thread trimming is completed, the sewing machine 10 immediately performs the presser foot lifting action. The drive source 20 drives the presser foot lifting cam 51 at the presser foot lifting operation angle. The arc surface of the presser foot lifting cam 51 is an idle surface, and the cam surface of the presser foot lifting cam 51 is a lifting surface for the presser foot lifting action. The drive source 20 drives the output shaft 21 to rotate the presser foot lifting cam 51, which uses the lifting surface to lift the presser foot lifting push rod 52. The presser foot lifting push rod 52 prompts the presser foot lifting terminal to perform the presser foot lifting action. The establishment of the above idle surface prevents the output shaft 21 from actually affecting the presser foot lifting action when performing other sewing actions.

[0041] The above is only one of the preferred implementation methods of this application, and does not limit the scope of patent implementation of this application. Any equivalent structure or equivalent process transformation based on the shape, structure, and principle of the description and drawings of this application, or direct or indirect application in other related technical fields, is included in the scope of patent protection of this application.

Claims

1. A sewing machine with stitch length adjustment and zero-position positioning of a swing seat, comprising a driving source (20), a connecting rod (44) and a swing seat (43), characterized in that: The invention also comprises an adjusting wheel (42) and a slider (45). The driving source (20) drives the slider (45) on the output shaft (21) to indirectly perform zero-position positioning of the swing seat (43). The slider (45) is arranged on a slide groove (421) provided on the adjusting wheel (42). The adjusting wheel (42) is connected to a connecting rod (44), and the connecting rod (44) is hinged to the swing seat (43). The invention also includes a driving source (20) and a swing seat zero position positioning mechanism (40), wherein the swing seat zero position positioning mechanism (40) includes a static positioning wheel (41), a fork-shaped shifting rod (47), a connecting rod (44), a slider (45) and a cloth feeding shaft (46), wherein the static positioning wheel (41) is fixed, and the output shaft (21) of the driving source (20) passes through the static positioning wheel (41) and is fixedly mounted with the slider (45), and a slide groove (421) is arranged at the center position of the regulating moving wheel (42), and an axis slot hole (422) and an axis hole (425) are arranged on the slide groove (421), and the axis slot hole (422) is in the shape of a long axis. The strip is hole-shaped, the shaft hole (425) is connected to the shaft slot hole (422), the static positioning wheel (41) has a stitch length adjustment and positioning groove (412), and a sliding member (423) is further provided on the sliding groove (421). The sliding member (423) is higher than the adjusting moving wheel (42) and extends to the inside of the positioning groove (4122) of the stitch length adjustment and positioning groove (412). The socket (471) of the fork-shaped shifting lever (47) is inserted into the annular step (424) of the adjusting moving wheel (42) with clearance fit. The fork-shaped shifting lever (47) is hinged to the connecting rod (44), and the connecting rod (44) is hinged to the swing seat (43); The stitch length adjustment and positioning groove (412) further comprises a transition groove 1 (4123) and a transition groove 2 (4124); the sliding member (423) is arranged at the longitudinal center position of the sliding groove (421) and at the eccentric position of the adjustment wheel (42); the sliding member (423) enters the positioning groove (4122) from the transition groove 1 (4123) or the transition groove 2 (4124); the positioning groove (4122) and the output shaft (21) are arranged in a concentric circle; the shaft hole (425) is connected to the shaft slot hole (422); The swing seat (43) comprises a short swing bar (431) and a long swing bar (432), and the upper planes of the short swing bar (431) and the long swing bar (432) are in a parallel state or a coplanar state under the indirect action of the sliding member (423).

2. A sewing machine with stitch length adjustment and zero position positioning of a swing seat according to claim 1, characterized in that: The stitch length adjustment and positioning groove (412) of the static positioning wheel (41) further comprises a stitch length adjustment groove (4121). The output shaft (21) of the driving source (20) drives the slider (45) at the original operating angle to drive the sliding member (423) to change the action position on the stitch length adjustment groove (4121). A connecting rod (44) is connected between the fork-shaped shifting lever (47) and the swing seat (43). A new stitch length is formed by changing the action position between the sliding member (423) and the stitch length adjustment groove (4121). The static positioning wheel (41) is fixed to the side of the machine body (11) with a screw (12). The static positioning wheel (41) is fixed to the side of the output shaft (21) close to the driving source (20).

3. A sewing machine with stitch length adjustment and zero position positioning of a swing seat according to claim 1, characterized in that: The driving source (20) is fixed on the side of the sewing machine (10) having the body (11); / or the driving source (20) is fixed on the back side of the body (11), and the driving source (20) uses a stepping motor or a servo motor.

4. A sewing machine with stitch length adjustment and zero position positioning of a swing seat according to claim 2, characterized in that: The through hole (411) of the static positioning wheel (41) and the output shaft (21) are arranged in a concentric circle, the stitch length adjustment and positioning groove (412) is a closed groove, and the through hole (411) is located inside the stitch length adjustment and positioning groove (412).

5. A sewing machine with stitch length adjustment and zero position positioning of a swing seat according to claim 1, characterized in that: The sewing machine (10) further comprises a presser foot lifting mechanism (50) and a thread trimming mechanism (60). After the sliding member (423) enters the stitch length adjustment groove (4121) to locate the zero point position of the swing seat, the driving source (20) drives the output shaft (21) to drive the adjusting wheel (42) to idle in the socket (471) of the fork-shaped shifting lever (47). At this time, the driving source (20) continues to operate, and the sliding member (423) gives the fork-shaped shifting lever (47), the connecting rod (44) and the swing seat (43) a non-swinging source transmission. At this time, the sewing machine (10) commands the driving source (20) to execute the presser foot lifting action of the presser foot lifting mechanism (50) and the thread trimming action of the thread trimming mechanism (60).

6. A sewing machine with stitch length adjustment and zero position positioning of a swing seat according to claim 1, characterized in that: The driving source (20) has a needle pitch adjustment operating angle, a swing seat zero position positioning operating angle, a presser foot lifting operating angle and a thread trimming operating angle. Each sewing action is performed at its own angle, and each operating angle does not interfere with each other. The driving source (20) drives the output shaft (21) to respectively implement the needle pitch adjustment, swing seat zero position positioning, presser foot lifting and thread trimming actions in different time periods and at different operating angles.

7. A sewing machine with stitch length adjustment and zero position positioning of a swing seat according to claim 5, characterized in that: The thread trimming mechanism (60) comprises a thread trimming crank (61), a thread trimming fork wheel (62) and a thread trimming end execution end. A pusher (611) is provided at an eccentric position of the thread trimming crank (61). The thread trimming fork wheel (62) comprises a return rod (621) and a thread trimming rod (622). The pusher (611) is located between the return rod (621) and the thread trimming rod (622). The driving source (20) drives the pusher (611) to rotate and press the thread trimming rod (622) downward to transmit the force of thread trimming to the thread trimming end execution end. The thread trimming action is completed by the thread trimming end execution end. After the thread trimming is completed, the driving source (20) continues to drive the pusher (611) to rotate to the return rod (621), and returns the return rod (621) to its original position and completes the entire thread trimming operation. The mechanism (60) is reset; the presser foot lifting mechanism (50) comprises a presser foot lifting cam (51), a presser foot lifting push rod (52) and a presser foot lifting end execution end; the driving source (20) drives the presser foot lifting cam (51) at the presser foot lifting running angle; the arc surface of the presser foot lifting cam (51) is an idle surface; the cam surface of the presser foot lifting cam (51) is a lifting surface for the presser foot lifting action; the driving source (20) drives the output shaft (21) to rotate the presser foot lifting cam (51) to lift the presser foot lifting push rod (52); the presser foot lifting push rod (52) finally causes the presser foot lifting end execution end to perform the presser foot lifting action; the thread trimming crank (61) and the presser foot lifting cam (51) are mounted on the output shaft (21); the thread trimming crank (61) is located at the outermost side of the output shaft (21).

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