CN115369574A - Sewing machine with needle pitch adjusting function and zero position positioning swing seat - Google Patents

Abstract

The utility model provides a sewing machine with gauge needle is adjusted and is fixed a position swing seat zero-bit, concretely relates to sewing machine manufacturing technical field. The zero-position positioning mechanism comprises a driving source and a zero-position positioning mechanism of the swinging seat, and is characterized in that the driving source drives a sliding block on an output shaft to indirectly perform zero-position positioning of the swinging seat on the swinging seat. Compared with the prior art, the sewing machine with needle gauge adjustment and location swing seat zero bit has the characteristics that location swing seat zero point position precision is high, quiet positioning wheel is equipped with the regulation driving wheel for fixed and makes the operation more stable, the clearance of each part after the location is less, the mechanical wear degree of each part is less, the noise is also lower relatively, the advantage of operating stably has, step motor or servo motor are preferentially used to the driving source of this application, make the driving source realize smoothly under sewing machine's intelligent control procedure, higher popularization and use value has.

Description

Sewing machine with needle pitch adjusting function and zero position positioning swing seat

Technical Field

The utility model provides a sewing machine with gauge needle is adjusted and is fixed a position swing seat zero-bit, concretely relates to sewing machine manufacturing technical field.

Background

The swing seat of the sewing machine is one of key parts for needle pitch adjustment and cloth feeding action. The prior art provides a sewing machine with zero position positioning function, which comprises a driving motor, a driving wheel, a needle gauge lever, a needle gauge adjusting connecting rod and a swinging seat driving motor, wherein the driving wheel is driven by the driving motor to act on the swinging seat through the needle gauge lever and the needle gauge adjusting connecting rod, the driving wheel is provided with a needle gauge adjusting and zero position positioning wheel, the driving motor drives the needle gauge adjusting and zero position positioning wheel to push a sliding piece of the needle gauge lever to enter a cloth feeding tooth zero position positioning groove of the needle gauge adjusting and zero position positioning wheel, and the sliding piece indirectly acts on the swinging seat to enable the swinging seat to be in a zero position state. The needle pitch adjusting and zero position positioning wheel is provided with a first zero return transition groove and a second zero return transition groove, the sliding part enters the feed dog zero position positioning groove from the first zero return transition groove or the second zero return transition groove, and the feed dog zero position positioning groove where the sliding part enters is the feed dog zero position of the sewing machine; the needle pitch adjusting and zero position positioning wheel pushes the sliding part under the driving of the driving motor, the action position of a needle pitch adjusting groove of the needle pitch adjusting and zero position positioning wheel is changed, and the original swing angle of the swing seat is changed through the needle pitch lever and the needle pitch adjusting connecting rod. This application a sewing machine with location zero position function beneficial effect is through driving motor drive cam, and the dwang is driven again to the cam, and sewing machine realizes carrying out the gauge needle and adjusts the action under the off-state. Because the driving wheel is arranged on the driving motor and runs along with the rotation of the motor, higher requirements are provided for the processing and mounting precision of the driving wheel, the positioning of the zero position of the swing seat of the sewing machine is accurate and inaccurate, and the sewing quality is influenced.

Disclosure of Invention

Aiming at the defect of inaccurate positioning in the zero position positioning technology of the sewing machine, the sewing machine with the functions of needle gauge adjustment and zero position positioning of the swing seat is particularly provided for solving the problems, and comprises a driving source and a zero position positioning mechanism of the swing seat, and is characterized in that the driving source drives a sliding block on an output shaft to indirectly perform zero position positioning of the swing seat on the swing seat; swing seat zero-position positioning mechanism includes static locating wheel, regulation driving wheel, swing seat, connecting rod, slider and work feed axle, static locating wheel is fixed, the output shaft that the driving source has passes static locating wheel and installation and is fixed with the slider, and the slider setting is on the spout that the regulation driving wheel has, and the spout setting is being adjusted the central point of driving wheel and is put, is provided with axle slot hole and shaft hole on the spout, and axle slot hole shape is rectangular interior pore-like, shaft hole and axle slot hole UNICOM, still be provided with the slider on the spout, static locating wheel has gauge needle and adjusts and the constant head tank, and the slider exceeds to adjust the driving wheel and extend to the gauge needle that the constant head tank has all the time and adjust and the constant head tank inside, and the ring clearance fit cover that the connecting rod has is established on adjusting the annular step that the driving wheel has, connecting rod and swing seat hinge, through swing seat zero-position location is carried out to swing seat indirectly to the slider on the driving source drive output shaft.

Preferably, the stitch length adjusting and positioning groove is further provided with a first transition groove and a second transition groove, the sliding piece is arranged at the longitudinal center of the sliding groove and at the eccentric position of the adjusting driving wheel, the sliding piece enters the positioning groove from the first transition groove or the second transition groove, the positioning groove and the output shaft are arranged in a concentric circle mode, and the shaft hole is communicated with the shaft groove hole.

Preferably, the swing seat is provided with a short swing strip and a long swing strip, and the upper planes of the short swing strip and the long swing strip are in a parallel state or a coplanar state under the indirect action of the sliding piece.

Preferably, the needle pitch adjusting and positioning groove of the static positioning wheel is further provided with a needle pitch adjusting groove, the output shaft of the driving source drives the sliding block to drive the sliding piece to change the action position on the needle pitch adjusting groove at the original operation corner, the adjusting driving wheel and the swinging seat are connected through the connecting rod, and the action position between the sliding piece and the needle pitch adjusting groove is changed to form a new needle pitch.

Preferably, the drive source is fixed on a side edge of the sewing machine body; or the driving source is fixed on the back of the machine body, and the driving source uses a stepping motor or a servo motor.

Preferably, the static positioning wheel is fixed on the side of the machine body by a screw, and the static positioning wheel is fixed on one side of the output shaft close to the driving source.

Preferably, the through hole of the static positioning wheel and the output shaft are arranged in a concentric circle, the needle pitch adjusting and positioning groove is a closed groove, and the through hole is positioned inside the needle pitch adjusting and positioning groove.

Preferably, the sewing machine further comprises a presser foot lifting mechanism and a thread cutting mechanism, after the sliding piece enters a zero position of the needle distance adjusting groove positioning swing seat, the driving source drives the output shaft to drive the adjusting driving wheel to rotate in the circular ring of the connecting rod, the driving source continues to operate at the moment, the sliding piece gives no swing source transmission to the connecting rod and the swing seat, and at the moment, the sewing machine orders the driving source to execute the presser foot lifting action of the presser foot lifting mechanism and the thread cutting action of the thread cutting mechanism.

Preferably, the driving source has a needle pitch adjusting operation corner, a swing seat zero position operation corner, a presser foot lifting operation corner and a thread cutting operation corner, respective sewing actions operate at respective corners, the operation corners are not interfered with each other, and the driving source drives the output shaft to perform the needle pitch adjusting, the swing seat zero position, the presser foot lifting and the thread cutting actions respectively in different time periods and different operation corners.

Preferably, the thread cutting mechanism is provided with a thread cutting crank, a thread cutting fork wheel and a thread cutting end execution end, a pushing piece is arranged at a deviation position of the thread cutting crank, the thread cutting fork wheel is provided with a return rod and a thread cutting rod, the pushing piece is positioned between the return rod and the thread cutting rod, the driving source drives the pushing piece to rotate to press the thread cutting rod downwards and transmit force to the thread cutting end execution end so as to cut threads, the thread cutting end execution end completes thread cutting action, after thread cutting is completed, the driving source continues to drive the pushing piece to rotate to the return rod, and the return rod returns to the original position along with the action and completes resetting of the whole thread cutting mechanism; the pressure foot lifting mechanism is provided with a pressure foot lifting cam, a pressure foot lifting ejector rod and a pressure foot lifting tail end execution end, the driving source drives the pressure foot lifting cam at a pressure foot lifting operation corner, an arc surface of the pressure foot lifting cam is a null surface, a cam surface of the pressure foot lifting cam is a jacking surface of pressure foot lifting action, the driving source drives the output shaft to rotate the pressure foot lifting cam to realize jacking of the pressure foot lifting ejector rod, the pressure foot lifting ejector rod finally enables the pressure foot lifting tail end execution end to execute pressure foot lifting action, the thread cutting crank and the pressure foot lifting cam are installed on the output shaft, and the thread cutting crank is located on the outermost side of the output shaft.

The utility model provides a sewing machine with gauge needle is adjusted and is fixed a position swing seat zero-bit has the characteristics that the zero point position precision of location swing seat is high compared with prior art, quiet positioning wheel makes the operation more stable for fixed being equipped with the regulation driving wheel, the clearance of each part after the location is less, the mechanical wear degree of each part is less, the noise is also lower relatively, the advantage that has the operation stability, step motor or servo motor are preferentially used to the driving source of this application, make the driving source can realize smoothly under sewing machine's intelligent control procedure, have higher using value widely.

Drawings

FIG. 1 is a schematic view of a sewing machine of the present application having a gauge adjustment and zero positioning of the swing seat;

FIG. 2 is a schematic view of a zero position positioning mechanism for a sewing machine swing seat having a needle gauge adjustment and positioning swing seat zero position according to the present application;

FIG. 3 is a schematic view of an adjustment wheel and output shaft of a sewing machine of the present application having a gauge adjustment and positioning of the zero position of the swing seat;

FIG. 4 is a schematic view of a sewing machine actuator and link connection with gauge adjustment and zero position positioning of the swing seat of the present application;

FIG. 5 is a schematic view of a sewing machine needle gauge sheave installation with needle gauge adjustment and zero positioning of the swing seat of the present application;

FIG. 6 is a structural view of an adjusting driving wheel of the sewing machine with needle pitch adjustment and zero positioning of the swing seat according to the present application;

FIG. 7 is a diagram of a needle gauge sheave of a sewing machine having needle gauge adjustment and zero positioning of a swing seat according to the present application;

FIG. 8 is a view of a linkage of the present application with gauge adjustment and zero positioning of the swing seat;

FIG. 9 is a schematic view of a presser foot lifting mechanism and a thread trimming mechanism of a sewing machine having a needle gauge adjustment and zero positioning of a swing seat according to the present application.

Reference numerals are as follows: the sewing machine comprises a sewing machine 10, a machine body 11, a screw 12, a driving source 20, an output shaft 21, a swing seat zero position positioning mechanism 40, a static positioning wheel 41, a through hole 411, a needle distance adjusting and positioning groove 412, an adjusting driving wheel 42, a sliding groove 421, a needle distance adjusting groove 4121, a positioning groove 4122, a transition groove I4123, a transition groove II 4124, a shaft groove hole 422, a sliding piece 423, an annular step 424, a shaft hole 425, a swing seat 43, a short swing strip 431, a long swing strip 432, a connecting rod 44, a circular ring 441, a sliding block 45, a cloth feeding shaft 46, a presser foot lifting mechanism 50, a thread trimming mechanism 60, a pushing piece 611, a presser foot lifting ejector rod 52, a thread trimming fork wheel 62, a thread trimming crank 61, a presser foot lifting cam 51, a return rod 621, a thread trimming rod 622 and a needle distance adjusting 80.

Detailed Description

Preferred embodiments of the present application will be described in detail below with reference to the accompanying fig. 1-9, so that the advantages and features of the present application can be more easily understood by those skilled in the art, and the scope of protection of the present application will be more clearly defined, and these embodiments are only used for illustration of the present invention, and are not limited to the present invention.

Fig. 1 and 2 are general structural diagrams of a sewing machine with a needle pitch adjustment function and a swing seat zero positioning function, the sewing machine 10 comprises a driving source 20, a needle pitch adjustment mechanism 80, a swing seat zero positioning mechanism 40, a presser foot lifting mechanism 50 and a thread trimming mechanism 60, and an output shaft 21 of the driving source 20 is mounted on and drives the needle pitch adjustment mechanism 80, the swing seat zero positioning mechanism 40, the presser foot lifting mechanism 50 and the thread trimming mechanism 60. The sewing machine 10 of the present application can perform the needle pitch adjustment 80 under the driving of the driving source 20; meanwhile, the zero position of the swing seat is positioned by the zero position positioning mechanism 40 of the swing seat, and the presser foot lifting action of the presser foot lifting mechanism 50 and the thread cutting action of the thread cutting mechanism 60 can be implemented under the drive of the same driving source 20, and the driving source 20 respectively implements the sewing actions of the four mechanisms in different time periods and different operation corners, so that the technical purpose that the zero position of the swing seat can be positioned by the sewing machine 10 under a stable structure is realized. The driving source 20 is fixed on the side of the machine body 11 of the sewing machine 10, or the driving source 20 is fixed on the back of the machine body 11, and the driving source 20 preferably uses a stepping motor or a servo motor in this embodiment.

Referring to fig. 1 to 8, the zero position positioning mechanism 40 of the swing seat includes a static positioning wheel 41, an adjusting moving wheel 42, a swing seat 43, a connecting rod 44, a sliding block 45 and a cloth feeding shaft 46. The static positioning wheel 41 is fixed and static under the function, the output shaft 21 of the driving source 20 passes through the through hole 411 of the static positioning wheel 41, the static positioning wheel 41 is fixed on the side of the machine body 11, the specific fixing scheme is that the static positioning wheel 41 is fixed by the screw 12, the static positioning wheel 41 is fixed on the side of the output shaft 21 close to the driving source 20, and therefore, the state that the output shaft 21 runs in the through hole 411 of the static positioning wheel 41 is formed.

The through hole 411 of the stationary positioning wheel 41 and the output shaft 21 are arranged concentrically. The static positioning wheel 41 is provided with a needle pitch adjusting and positioning groove 412, the needle pitch adjusting and positioning groove 412 is a closed groove, the through hole 411 is positioned inside the needle pitch adjusting and positioning groove 412, the needle pitch adjusting and positioning groove 412 is provided with a needle pitch adjusting groove 4121, a positioning groove 4122, a first transition groove 4123 and a second transition groove 4124 which are positioned between the needle pitch adjusting groove 4121 and the positioning groove 4122, the needle pitch adjusting groove 4121 is used for needle pitch adjustment, the positioning groove 4122 is used for positioning the zero position of the swing seat, and the first transition groove 4123 and the second transition groove 4124 play a role in transition between the needle pitch adjusting groove 4121 and the positioning groove 4122.

The output shaft 21 is also provided with an adjusting moving wheel 42 and a sliding block 45, the sliding block 45 is fixed on the output shaft 21, and the sliding block 45 is fixed on the output shaft 21 by a small screw at the center hole. The slider 45 is located outside the stationary sheave 41. A sliding groove 421 is arranged at the central position of the adjusting driving wheel 42, a sliding block 45 is arranged in the sliding groove 421 in a clearance matching manner, and the sliding groove 421 is used for the sliding of the sliding block 45; the adjusting moving wheel 42 is provided with a shaft slot hole 422, a sliding piece 423 and a shaft hole 425, the shaft slot hole 422 is positioned at the central position of the adjusting moving wheel 42, the shape of the shaft slot hole 422 is a long inner hole shape and penetrates through the adjusting moving wheel 42, the shaft slot hole 422 extends towards the edge at the central position of the adjusting moving wheel 42, the output shaft 21 penetrates through the shaft slot hole 422, and the shaft slot hole 422 is used for avoiding the output shaft 21 to run when the adjusting moving wheel 42 rotates; the shaft hole 425 is located at the center position of the adjusting sheave 42 for the output shaft 21 to run at the center position of the adjusting sheave 42, and the shaft hole 425 is communicated with the shaft groove hole 422. The sliding member 423 is disposed on the sliding groove 421 of the adjusting moving wheel 42, and the sliding member 423 is disposed at an eccentric position of the adjusting moving wheel 42. The sliding part 423 is higher than the adjusting moving wheel 42 and extends to the inside of the needle pitch adjusting and positioning groove 412 of the static positioning wheel 41, the sliding part 423 is in limited operation inside the needle pitch adjusting groove 4121 of the needle pitch adjusting and positioning groove 412, the sliding part 423 slides in different operation grooves inside the needle pitch adjusting and positioning groove 412 under the operation of the sliding block 45 to push the adjusting moving wheel 42, and the adjusting moving wheel 4 generates different swing sources for the connecting rod 44 and the swing seat 43 thereof.

The adjusting movable wheel 42 is movably connected to the connecting rod 44, the upper end of the connecting rod 44 is provided with a circular ring 441, the connecting rod 44 is sleeved on the annular step 424 of the adjusting movable wheel 42 in the shape of the circular ring 441, the connecting rod and the adjusting movable wheel are connected in a sleeved and movable connection mode, and the circular ring 441 is in clearance fit with the annular step 424. After the driving source 20 drives the sliding block 45 through the output shaft 21, the sliding block 45 rotates and pushes the sliding member 423 of the sliding slot 421, so that the whole adjusting driving wheel 42 performs corresponding operations on the needle pitch adjusting and positioning slot 412 along with the sliding block 45. The other end of the link 44 is indirectly hinged to the swing base 43, and the swing base 43 is hinged to the cloth feeding shaft 46 in a swing output manner. The operation of the adjusting driving wheel 42 can drive the connecting rod 44 to generate a swing source, so that needle pitch adjustment and swing seat zero position (the two actions of needle pitch adjustment and swing seat zero position are only different from the action position between the sliding groove 421 and the sliding member 423) can be implemented, and on the other hand, the operation of the adjusting driving wheel 42 can enable the connecting rod 44 to be in a relatively static state. When the link 44 does not apply a pushing force to the swinging seat 43, the driving source 20 performs a presser foot raising operation or a thread cutting operation.

The driving source 20 is provided with a needle pitch adjusting operation corner, a swing seat zero position operation corner, a presser foot lifting operation corner and a thread cutting operation corner, wherein the needle pitch adjusting operation corner, the swing seat zero position operation corner, the presser foot lifting action and the thread cutting action are operated on the driving source 20 according to a preset operation corner, respective sewing actions are operated on respective corners, the operation corners are operated at different times, the operation corners are not interfered with each other, and the actions are clear.

The pitch adjusting and positioning groove 412 has a pitch adjusting groove 4121, a positioning groove 4122, and a first transition groove 4123 and a second transition groove 4124 between the pitch adjusting groove 4121 and the positioning groove 4122. The needle pitch adjusting groove 4121 is used for needle pitch adjustment, and the positioning groove 4122 is used for zero position positioning of the swing seat and is simultaneously applied to a presser foot lifting action or a thread cutting action.

When the sewing machine 10 is to perform the stitch length adjustment, the output shaft 21 of the driving source 20 drives the sliding block 45 to drive the sliding member 423 to operate at the original operation corner, so as to change the action position of the sliding member 423 on the stitch length adjusting groove 4121 by rotation, and the driving source 20 drives the sliding block 45 to indirectly perform the stitch length adjustment on the swinging seat 43, so that the sewing machine 10 generates a new stitch length. The adjusting driving wheel 42 and the swinging seat 43 are connected by a connecting rod 44 to transmit the rotation angle, the action position between the sliding piece 423 and the needle pitch adjusting groove 4121 is changed to change the swinging angle of the swinging seat 43 so as to form a new needle pitch, the swinging seat 43 indirectly transmits the changed actual swinging angle to a feed dog of the sewing machine through a feed shaft 46, and the feed dog finally performs sewing with the new needle pitch.

When the sewing machine 10 is to perform the zero position operation of the positioning swing seat, the sliding member 423 enters the positioning groove 4122 from the needle pitch adjusting groove 4121 through the transition groove one 4123 or the transition groove two 4124. When the sliding member 423 enters the positioning groove 4122 from the transition groove one 4123 or the transition groove two 4124, that is, the sliding member 423 enters the positioning groove 4122 to determine the swing seat zero position, the sliding member 423 pushes the swing seat 43 to enter the swing seat zero position state through the connecting rod 44. At this time, since the positioning groove 4122 is concentrically arranged with the output shaft 21, the slider 45 is driven by the output shaft 21 to make the sliding member 423 push the output shaft 21 in the shaft groove 422 of the adjusting sheave 42 to be located at the center of the adjusting sheave 42. The swing seat 43 has a short swing strip 431 and a long swing strip 432, specifically, the swing seat 43 is that the upper planes of the short swing strip 431 and the long swing strip 432 are in a parallel or coplanar state under the indirect action of the sliding member 423, and at this time, the swing seat 43 indirectly enables the feed dog to be in a zero-gauge state through the feed shaft 46, that is, the feed dog loses front and back feed power. Thus, the interaction of the slider 423 and the gauge adjustment groove 4121 determines the positioning of the zero position of the oscillating seat. The determination of the zero position of the swinging seat effectively solves the problem of inaccurate zero position positioning of the existing sewing machine, improves the sewing stability and further improves the sewing quality.

After the zero position of the swing seat is positioned, the ring 441 of the connecting rod 44 is in clearance fit with the annular step 424 of the adjusting driving wheel 42, so that the positions of the connecting rod 44 and the adjusting driving wheel 42 are constrained with each other, the adjusting driving wheel 42 is in reliable mechanical connection with the connecting rod 44, the reliability of the zero position positioning of the swing seat is realized, and the defect of low stability in the positioning process in the prior art is overcome.

After the slider 423 enters the needle pitch adjustment groove 4121 and locates the zero position of the swing seat, the slider 423 continues to stay on the needle pitch adjustment groove 4121, the driving source 20 continues to operate, and the slider 423 transmits the connecting rod 44 and the swing seat 43 without a swing source. The driving source 20 drives the output shaft 21 to drive the adjusting driving wheel 42 to idle in the circular ring 441 of the connecting rod 44, and 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 cutting action of the thread cutting mechanism 60.

Referring to the drawings, FIG. 2 and FIG. 9 show a sewing machine with zero position of the swing seat according to the present application including a presser foot lifting mechanism 50 and a thread trimming mechanism 60. When the sewing machine 10 finishes sewing, it is necessary to perform the thread cutting and then the presser foot lifting operation, and the driving source 20 performs the presser foot lifting operation at the presser foot lifting operation rotation angle and the thread cutting operation at the thread cutting operation rotation angle.

The thread trimming mechanism 60 comprises a thread trimming crank 61, a thread trimming fork wheel 62 and a thread trimming end execution end; the presser foot lifting mechanism 50 includes a presser foot lifting cam 51, a presser foot lifting jack 52, and a presser foot lifting end execution end. The thread cutting crank 61 and the presser foot lifting cam 51 are arranged on the output shaft 21, the thread cutting crank 61 is positioned at the outermost side of the output shaft 21, and one side of the presser foot lifting cam 51 close to the adjusting driving wheel 42 is positioned between the adjusting driving wheel 42 and the thread cutting crank 61.

The driving source 20 performs the thread cutting operation at the thread cutting operation rotation angle, the output shaft 21 is located at the center position of the adjusting movable wheel 42 at the time, and the adjusting movable wheel 42 and the connecting rod 44 are always in idle rotation no matter how the output shaft 21 operates. The entire groove of the positioning groove 4122 is sufficient for the driving source 20 to perform the presser foot lifting action and the thread cutting action at the presser foot lifting operation rotation angle and the thread cutting operation rotation angle.

The eccentric position of the thread cutting crank 61 is provided with a pushing piece 611, the thread cutting fork wheel 62 is provided with a return rod 621 and a thread cutting rod 622, the pushing piece 611 is positioned between the return rod 621 and the thread cutting rod 622, the driving source 20 drives the pushing piece 611 to rotate, the thread cutting rod 622 is pressed downwards to be transmitted to the thread cutting end execution end to cut thread, and thread cutting action is completed by the thread cutting end execution end. After the trimming is completed, the driving source 20 continues to drive the pushing member 611 to rotate to the return rod 621, and the return rod 621 is returned to the original position, so that the resetting of the whole trimming mechanism 60 is completed.

After the thread trimming is completed, the sewing machine 10 immediately performs the presser foot raising operation, the driving source 20 drives the presser foot raising cam 51 at the presser foot raising operation rotation angle, the circular arc surface of the presser foot raising cam 51 is a blank surface, and the cam surface of the presser foot raising cam 51 is a lifting surface of the presser foot raising operation. The driving source 20 drives the output shaft 21 to rotate the presser foot lifting cam 51 to realize the presser foot lifting ejector rod 52 by using the lifting surface, and the presser foot lifting ejector rod 52 prompts the presser foot lifting tail execution end to execute the presser foot lifting action. The idle rotation surface is arranged so that the output shaft 21 does not actually act on the presser foot lifting action during other sewing actions.

The above description is only one of the preferred embodiments of the present application, and does not limit the scope of the present application, and all the modifications, equivalents, or equivalent processes that can be made by using the shapes, structures, and principles of the disclosure and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present application.

Claims (10)

1. A sewing machine with needle pitch adjustment and zero positioning of a swing seat comprises a driving source (20) and a swing seat zero positioning mechanism (40), and is characterized in that the driving source (20) drives a sliding block (45) on an output shaft (21) to indirectly perform swing seat zero positioning on a swing seat (43).

2. A sewing machine with gauge adjustment and zero positioning of the oscillating seat according to claim 1, it is characterized in that the zero position positioning mechanism (40) of the swinging seat comprises a static positioning wheel (41), an adjusting driving wheel (42), a swinging seat (43), a connecting rod (44), a sliding block (45) and a cloth feeding shaft (46), the static positioning wheel (41) is fixed, the output shaft (21) penetrates through the static positioning wheel (41) and is fixedly provided with a sliding block (45), the sliding block (45) is arranged on a sliding groove (421) of the adjusting driving wheel (42), the sliding groove (421) is arranged at the central position of the adjusting driving wheel (42), a shaft groove hole (422) and a shaft hole (425) are arranged on the sliding groove (421), the shaft groove hole (422) is in a long-strip inner hole shape, the shaft hole (425) is communicated with the shaft groove hole (422), the sliding groove (421) is further provided with a sliding piece (423), the static positioning wheel (41) is provided with a needle pitch adjusting and positioning groove (412), the sliding piece (423) is higher than the adjusting driving wheel (42) and extends into a positioning groove (4122) formed in the needle pitch adjusting and positioning groove (412), a circular ring (441) arranged on the connecting rod (44) is sleeved on an annular step (424) formed in the adjusting driving wheel (42) in a clearance fit mode, and the connecting rod (44) is hinged to the swinging seat (43).

3. The sewing machine with the needle pitch adjustment and the zero position of the positioning swing seat according to claim 2, characterized in that the needle pitch adjustment and positioning groove (412) further comprises a first transition groove (4123) and a second transition groove (4124), the sliding member (423) is arranged at the longitudinal center position of the sliding groove (421) and at the eccentric position of the adjusting driving wheel (42), the sliding member (423) enters the positioning groove (4122) from the first transition groove (4123) or the second transition groove (4124), the positioning groove (4122) is arranged concentrically with the output shaft (21), and the shaft hole (425) is communicated with the shaft groove hole (422).

4. A machine with needle gauge adjustment and zero position of oscillating seat according to claim 1 or 2, characterized by the fact that said oscillating seat (43) has a short oscillating bar (431) and a long oscillating bar (432), the upper planes of both of which are in parallel or coplanar condition under the indirect action of the slide (423).

5. The sewing machine with the needle pitch adjustment and the zero position of the swing seat as claimed in claim 2, wherein the needle pitch adjustment and positioning groove (412) of the static positioning wheel (41) further has a needle pitch adjustment groove (4121), the output shaft (21) of the driving source (20) drives the sliding block (45) to drive the sliding member (423) to change the action position on the needle pitch adjustment groove (4121) at the original operation corner, the adjusting driving wheel (42) and the swing seat (43) are connected by the connecting rod (44), the action position between the sliding member (423) and the needle pitch adjustment groove (4121) is changed to form a new needle pitch, the static positioning wheel (41) is fixed on the side of the machine body (11) by the screw (12), and the static positioning wheel (41) is fixed on the side of the output shaft (21) close to the driving source (20).

6. A machine with needle gauge adjustment and zero position of the oscillating holder, according to claim 1 or 2, characterized in that said drive source (20) is fixed on the side of the machine (10) having the machine body (11); or the driving source (20) is fixed on the back surface of the machine body (11), and the driving source (20) adopts a stepping motor or a servo motor.

7. A machine with needle pitch adjustment and zero positioning of oscillating holder, according to claim 2, characterized in that the static positioning wheel (41) has through holes (411) and output shaft (21) arranged concentrically, the needle pitch adjustment and positioning slot (412) being a closed groove, the through holes (411) being located inside the needle pitch adjustment and positioning slot (412).

8. The sewing machine with the needle pitch adjustment function and the zero position of the positioning swing seat as claimed in claim 1, wherein the sewing machine (10) further comprises a foot lifting and pressing mechanism (50) and a thread cutting mechanism (60), after the sliding member (423) enters the needle pitch adjustment groove (4121) to position the zero position of the swing seat, the driving source (20) drives the output shaft (21) to drive the adjustment driving wheel (42) to idle in the ring (441) of the connecting rod (44), the driving source (20) continues to operate at the moment, the sliding member (423) gives the connecting rod (44) and the swing seat (43) no swing source to transmit the moment, and the sewing machine (10) commands the driving source (20) to execute the foot lifting and pressing actions of the foot lifting and pressing mechanism (50) and the thread cutting actions of the thread cutting mechanism (60).

9. The sewing machine with needle gauge adjustment and zero positioning of the swing seat as claimed in claim 1, characterized in that the driving source (20) has a needle gauge adjustment operation angle, a swing seat zero positioning operation angle, a presser foot lifting operation angle and a thread cutting operation angle, respective sewing actions are performed at the respective angles, the respective operation angles do not interfere with each other, and the driving source (20) drives the output shaft (21) to perform the needle gauge adjustment, the swing seat zero positioning, the presser foot lifting and the thread cutting actions respectively in different time periods and in different operation angles.

10. The sewing machine with the needle pitch adjustment function and the zero position of the positioning swing seat as claimed in claim 8, wherein the thread cutting mechanism (60) has a thread cutting crank (61), a thread cutting fork wheel (62) and a thread cutting end execution end, a pushing member (611) is arranged at an eccentric position of the thread cutting crank (61), the thread cutting fork wheel (62) has a return rod (621) and a thread cutting rod (622), the pushing member (611) is located between the return rod (621) and the thread cutting rod (622), the driving source (20) drives the pushing member (611) to rotate to press the thread cutting rod (622) downwards to transmit the force of the thread cutting end execution end to the thread cutting end execution end, the thread cutting action is completed by the thread cutting end execution end, after the thread cutting is completed, the driving source (20) continues to drive the pushing member (611) to rotate to the return rod (621), and the return rod (621) to the original position while the whole thread cutting mechanism (60) is reset; the presser foot lifting mechanism (50) is provided with a presser foot lifting cam (51), a presser foot lifting ejector rod (52) and a presser foot lifting tail end execution end, the driving source (20) drives the presser foot lifting cam (51) at a presser foot lifting operation corner, an arc surface of the presser foot lifting cam (51) is a hollow surface, a cam surface of the presser foot lifting cam (51) is a jacking surface of a presser foot lifting action, the driving source (20) drives the output shaft (21) to rotate the presser foot lifting cam (51) to realize jacking of the presser foot lifting ejector rod (52), the presser foot lifting ejector rod (52) finally enables the presser foot lifting tail execution end to execute the presser foot lifting action, the thread cutting crank (61) and the presser foot lifting cam (51) are installed on the output shaft (21), and the thread cutting crank (61) is located on the outermost side of the output shaft (21).

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