阅读说明：本技术 针距调节机构及具有其的缝纫机 (Needle pitch adjusting mechanism and sewing machine with same ) 是由 陈美正 潘兵 陈满良 楼俏军 于 2019-01-31 设计创作，主要内容包括：本发明提供了一种针距调节机构及具有其的缝纫机,包括偏心轮组件,偏心轮组件用于在缝纫时带动送布组件运动,送布组件带动缝料进行移动,偏心轮组件包括偏心轴套和齿板滑道体,偏心轴套的至少部分套设在齿板滑道体上；主轴的至少部分穿设在偏心轮组件内并与偏心轮组件连接以进行传动,主轴的至少部分穿过齿板滑道体的中心孔并与偏心轴套固定连接；按钮轴组件可伸缩地设置在偏心轮组件的侧方,按钮轴组件的端部设置有调节卡板,以通过按压按钮轴组件带动调节卡板朝向偏心轮组件的方向运动以止挡齿板滑道体随主轴进行转动,并通过调节偏心轴套与齿板滑道体的中心距对缝纫机的缝纫针距进行调节,以解决现有技术中缝纫机针距调节不便的问题。(The invention provides a needle pitch adjusting mechanism and a sewing machine with the same, and the needle pitch adjusting mechanism comprises an eccentric wheel assembly, wherein the eccentric wheel assembly is used for driving a cloth feeding assembly to move during sewing, the cloth feeding assembly drives a sewing material to move, the eccentric wheel assembly comprises an eccentric shaft sleeve and a toothed plate slideway body, and at least part of the eccentric shaft sleeve is sleeved on the toothed plate slideway body; at least part of the main shaft penetrates through the eccentric wheel assembly and is connected with the eccentric wheel assembly to carry out transmission, and at least part of the main shaft penetrates through a central hole of the toothed plate slideway body and is fixedly connected with the eccentric shaft sleeve; the button shaft assembly is telescopically arranged on the side of the eccentric wheel assembly, the adjusting clamping plate is arranged at the end part of the button shaft assembly, the button shaft assembly is pressed to drive the adjusting clamping plate to move towards the direction of the eccentric wheel assembly so as to stop the toothed plate slide way body to rotate along with the main shaft, and the sewing needle distance of the sewing machine is adjusted by adjusting the center distance between the eccentric shaft sleeve and the toothed plate slide way body, so that the problem that the sewing machine needle distance is inconvenient to adjust in the prior art is solved.)

1. A needle pitch adjustment mechanism for adjusting a needle pitch of a sewing machine, the needle pitch adjustment mechanism comprising:

the eccentric wheel assembly (10) is used for driving the cloth feeding assembly to move during sewing so that the cloth feeding assembly drives the sewing material to move; the eccentric wheel assembly (10) comprises an eccentric shaft sleeve (11) and a toothed plate slideway body (12), and at least part of the eccentric shaft sleeve (11) is sleeved on the toothed plate slideway body (12);

the main shaft (20), at least part of the main shaft (20) is arranged in the eccentric wheel assembly (10) in a penetrating way and is connected with the eccentric wheel assembly (10) for transmission, and at least part of the main shaft (20) penetrates through the central hole of the toothed plate slideway body (12) and is fixedly connected with the eccentric shaft sleeve (11);

button shaft subassembly (30), button shaft subassembly (30) telescopically sets up the side of eccentric wheel subassembly (10), the tip of button shaft subassembly (30) is provided with adjusts cardboard (31), in order through pressing button shaft subassembly (30) makes it drive adjust cardboard (31) orientation the direction motion of eccentric wheel subassembly (10), so that adjust cardboard (31) pressure and establish with the backstop on pinion rack slide body (12) rotate along with main shaft (20), and through adjusting eccentric shaft sleeve (11) with centre-to-centre spacing between pinion rack slide body (12) is adjusted sewing needle distance of sewing machine.

2. The needle gauge adjustment mechanism of claim 1, wherein the push button shaft assembly (30) comprises:

the first section of button shaft (32), the adjusting clamp plate (31) is arranged at the end part of the first section of button shaft (32);

and the second section of button shaft (33), the second section of button shaft (33) with the first section of button shaft (32) keep away from one end of the adjusting clamping plate (31) is connected, so that the first section of button shaft (32) drives the adjusting clamping plate (31) to move towards the eccentric wheel assembly (10) by pressing the second section of button shaft (33).

3. The needle pitch adjusting mechanism according to claim 2, wherein a spring (34) is sleeved on the second section of button shaft (33), an annular protrusion (35) is arranged on a shaft body of the second section of button shaft (33) far away from the first section of button shaft (32), one end of the spring (34) abuts against the annular protrusion (35), and the other end of the spring (34) abuts against a machine body of the sewing machine, so that the second section of button shaft (33) is pushed to move by a restoring force of the spring (34), and the adjusting clamping plate (31) is driven by the second section of button shaft (33) to be far away from the slideway body (12).

4. The needle pitch adjustment mechanism of claim 3, characterized in that the first section button shaft (32) and the second section button shaft (33) are in threaded connection, and an end of the second section button shaft (33) remote from the first section button shaft (32) is provided with an operation slot (330) to drive the second section button shaft (33) to rotate by means of an operation slot screwdriver cooperating with the operation slot (330) to screw the first section button shaft (32) and the second section button shaft (33) to each other.

5. The needle pitch adjusting mechanism according to claim 2, wherein a threaded hole is formed at an end of the first section of the button shaft (32), and a through hole is formed in the adjusting clamp plate (31), so that at least a part of the connecting bolt passes through the through holes in sequence and then is in threaded fit with the threaded hole, so that the adjusting clamp plate (31) is locked at the end of the first section of the button shaft (32).

6. The needle gauge adjustment mechanism of claim 1, wherein the adjustment catch plate (31) comprises:

a stop (310) for stopping the tooth plate slide body (12);

installation department (311), be used for with button shaft subassembly (30) are connected, installation department (311) includes first plate body, second plate body and third plate body, first plate body with the second plate body sets up relatively, the third plate body is located first plate body with between the second plate body, first plate body with the second plate body all through the arc plate body with the third plate body is connected, in order to dodge the second plate body with form between the second plate body and dodge region, in order to dodge eccentric wheel subassembly (10), backstop portion (310) are installed first plate body or on the second plate body.

7. The needle gage adjustment mechanism according to claim 1, wherein the eccentric wheel assembly (10) further comprises:

the main shaft (20) is sleeved with the retaining ring (13), the retaining ring (13) is fixedly connected with the eccentric shaft sleeve (11), and the main shaft (20) drives the eccentric shaft sleeve (11) to rotate through the retaining ring (13).

8. The needle pitch adjusting mechanism according to claim 7, wherein the retainer ring (13) is provided with a connecting hole (130), and the retainer ring (13) is fixedly connected with the main shaft (20) through the connecting hole (130);

the end face of the retainer ring (13) is provided with a connecting pin (131), the end face of the eccentric shaft sleeve (11) is provided with a groove (110) matched with the connecting pin (131), and the connecting pin (131) is clamped in the groove (110).

9. Needle pitch adjustment mechanism according to claim 8, wherein said groove (110) extends in radial direction of said eccentric sleeve (11) so that said connecting pin (131) is slidably snapped into said groove (110).

10. The gauge adjustment mechanism of claim 1, wherein the toothed plate slide body (12) comprises;

the circumference of the first slide way body (120) is provided with a clamping groove (1201) matched with the adjusting clamping plate (31), and the first slide way body (120) is provided with a central hole for the main shaft (20) to penetrate through;

the second slideway body (121), the second slideway body (121) extends axially along the central hole of the first slideway body (120), the second slideway body (121) is an eccentric slideway body, and at least part of the main shaft (20) passes through the first slideway body (120) and the second slideway body (121) in sequence; the eccentric shaft sleeve (11) is sleeved on the second slide way body (121) so as to adjust the sewing needle distance of the sewing machine by adjusting the center distance between the second slide way body (121) and the eccentric shaft sleeve (11).

11. The needle gage adjustment mechanism according to claim 10, wherein the eccentric wheel assembly (10) further comprises:

the inner gear ring (14), the inner gear ring (14) is fixedly connected with the main shaft (20);

the sector gear (15) is meshed with the inner gear ring (14), the sector gear (15) is connected with the toothed plate slideway body (12), and the sector gear (15) is meshed with the inner gear ring (14) to enable the sector gear (15) to drive the toothed plate slideway body (12) to rotate;

when the adjusting clamping plate (31) is clamped into the clamping groove (1201), at least part of the adjusting clamping plate (31) pushes the sector gear (15) to slide along the radial direction of the inner gear ring (14) so that the sector gear (15) is separated from the inner gear ring (14), and the toothed plate slideway body (12) is fixed when the main shaft (20) is rotated.

12. The needle gage adjustment mechanism according to claim 11, wherein the eccentric wheel assembly (10) further comprises:

the end face of the sector gear plate (17) is fixedly mounted on the sector gear (15), the other end face of the sector gear plate (17) is slidably mounted on the first slide way body (120), at least part of the circumferential end face of the sector gear plate (17) is located at the clamping groove (1201), and the adjusting clamping plate (31) pushes the sector gear plate (17) to slide along the radial direction of the inner gear ring (14) so as to drive the sector gear (15) to be separated from the inner gear ring (14).

13. A sewing machine comprising a gauge adjustment mechanism, characterized in that the gauge adjustment mechanism is as claimed in any one of claims 1 to 12.

Technical Field

The invention relates to the field of sewing, in particular to a needle pitch adjusting mechanism and a sewing machine with the same.

Background

In the sewing machine industry, the stitch length of an overlock machine needs to be adjusted frequently, the overlock machine is realized by a stitch length button shaft and a feeding eccentric wheel assembly at present, the button shaft of one overlock machine needs to be assembled earliest when the whole machine is assembled, the assembly of parts such as a lower cutter seat and the like at the back can be influenced, the operation is complex when the stitch length is adjusted, and a large amount of time needs to be wasted.

Disclosure of Invention

The invention mainly aims to provide a needle pitch adjusting mechanism and a sewing machine with the same, and aims to solve the problem that the needle pitch of the sewing machine in the prior art is inconvenient to adjust.

In order to achieve the above object, according to one aspect of the present invention, there is provided a needle pitch adjusting mechanism for adjusting a needle pitch of a sewing machine, the needle pitch adjusting mechanism comprising: the eccentric wheel component is used for driving the cloth feeding component to move during sewing so as to enable the cloth feeding component to drive the sewing material to move; the eccentric wheel assembly comprises an eccentric shaft sleeve and a toothed plate slideway body, and at least part of the eccentric shaft sleeve is sleeved on the toothed plate slideway body; at least part of the main shaft penetrates through the eccentric wheel assembly and is connected with the eccentric wheel assembly to carry out transmission, and at least part of the main shaft penetrates through a central hole of the toothed plate slideway body and is fixedly connected with the eccentric shaft sleeve; the button shaft subassembly, the button shaft subassembly telescopically sets up in the side of eccentric wheel subassembly, the tip of button shaft subassembly is provided with the regulation cardboard to make it drive through pressing the button shaft subassembly and adjust the direction motion of cardboard towards the eccentric wheel subassembly, so that adjust the cardboard and press to establish and rotate along with the main shaft with backstop pinion rack slide body on the pinion rack slide body, and adjust sewing needle gauge to sewing machine through adjusting the centre-to-centre spacing between eccentric shaft sleeve and the pinion rack slide body.

Further, the button shaft assembly includes: the adjusting clamping plate is arranged at the end part of the first section of button shaft; the second section button shaft, the second section button shaft is connected with the one end that the regulation cardboard was kept away from to first section button shaft to make first section button shaft drive the regulation cardboard move towards eccentric wheel assembly through pressing down the second section button shaft.

Further, the cover is equipped with the spring on the second section button axle, and it is protruding that the second section button axle is provided with the annular on keeping away from the axis body of first section button axle, and spring one end butt is protruding at the annular, and the other end butt of spring is on sewing machine's organism to the restoring force through the spring promotes the removal of second section button axle, so that second section button axle drives the regulation cardboard and keeps away from the pinion rack slide body.

Further, first section button axle and second section button axle threaded connection, the one end that first section button axle was kept away from to second section button axle is provided with the operation groove to utilize the operation groove screwdriver with operation groove matched with to drive second section button axle and rotate, in order to screw first section button axle and second section button axle each other.

Further, the tip of first section button axle seted up the screw hole, seted up the clearing hole on the regulation cardboard to make connecting bolt's at least part pass in proper order behind the clearing hole with screw hole screw-thread fit, in order to adjust the cardboard locking in the tip of first section button axle.

Further, the regulation cardboard includes: the stopping part is used for stopping the toothed plate slideway body; the installation department for be connected with the button shaft subassembly, the installation department includes first plate body, second plate body and third plate body, and first plate body and second plate body set up relatively, and the third plate body is located between first plate body and the second plate body, and first plate body and second plate body all are connected with the third plate body through the arc plate body, in order to form between second plate body and dodge the region, in order to dodge eccentric wheel assembly, backstop portion installs on first plate body or second plate body.

Further, the eccentric wheel assembly still includes: and the retainer ring is sleeved on the main shaft and fixedly connected with the eccentric shaft sleeve, and the main shaft drives the eccentric shaft sleeve to rotate through the retainer ring.

Furthermore, a connecting hole is formed in the check ring, and the check ring is fixedly connected with the main shaft through the connecting hole; the end face of the retainer ring is provided with a connecting pin, the end face of the eccentric shaft sleeve is provided with a groove matched with the connecting pin, and the connecting pin is clamped in the groove.

Further, a groove extends in the radial direction of the eccentric sleeve, so that the connecting pin is slidably caught in the groove.

Further, the toothed plate slideway body comprises a toothed plate slideway body; the circumference of the first slide way body is provided with a clamping groove matched with the adjusting clamping plate, and the first slide way body is provided with a central hole for the main shaft to penetrate through; the second slideway body extends axially along the central hole of the first slideway body, the second slideway body is an eccentric slideway body, and at least part of the main shaft sequentially passes through the first slideway body and the second slideway body; the eccentric shaft sleeve is sleeved on the second slideway body so as to adjust the sewing needle distance of the sewing machine by adjusting the center distance between the second slideway body and the eccentric shaft sleeve.

Further, the eccentric wheel assembly still includes: the inner gear ring is fixedly connected with the main shaft; the sector gear is meshed with the inner gear ring and is connected with the toothed plate slideway body, so that the sector gear drives the toothed plate slideway body to rotate by meshing the sector gear with the inner gear ring; when the adjusting clamping plate is clamped into the clamping groove, at least part of the adjusting clamping plate pushes the sector teeth to slide along the radial direction of the inner gear ring so that the sector teeth are separated from the inner gear ring, and the toothed plate slideway body is fixed when the main shaft is rotated.

Further, the eccentric wheel assembly still includes: one end face of the sector gear plate is fixedly arranged on the sector gear, the other end face of the sector gear plate is slidably arranged on the first slideway body, at least part of the circumferential end face of the sector gear plate is located at the clamping groove, and the adjusting clamping plate pushes the sector gear plate to slide along the radial direction of the inner gear ring so as to drive the sector gear to be separated from the inner gear ring.

According to another aspect of the present invention, there is provided a sewing machine including a needle pitch adjusting mechanism as described above.

By applying the technical scheme of the invention, the stitch length adjusting mechanism comprises an eccentric wheel assembly, a main shaft and a button shaft assembly, at least part of the main shaft penetrates through the eccentric wheel assembly and is connected with the eccentric wheel assembly for transmission, the eccentric wheel assembly comprises an eccentric shaft sleeve and a toothed plate slideway body, at least part of the main shaft penetrates through a central hole of the toothed plate slideway body and is fixedly connected with the eccentric shaft sleeve, at least part of the eccentric shaft sleeve is sleeved on the toothed plate slideway body, the button shaft assembly is telescopically arranged on the side of the eccentric wheel assembly, an adjusting clamping plate is arranged at the end part of the button shaft assembly so as to drive the adjusting clamping plate to move towards the direction of the eccentric wheel assembly by pressing the button shaft assembly to stop the toothed plate slideway body to rotate along with the main shaft, the sewing stitch length of the sewing machine is adjusted by adjusting the central distance between the eccentric shaft sleeve and the, the time for adjusting the needle pitch is reduced, and the problem that the needle pitch of the sewing machine in the prior art is inconvenient to adjust is solved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a block diagram of an embodiment of a gauge adjustment mechanism according to the present invention;

FIG. 2 shows a cross-sectional view of a gauge adjustment mechanism according to the present invention;

FIG. 3 shows an exploded view of an eccentric wheel assembly of the gauge adjustment mechanism according to the present invention;

FIG. 4 shows a schematic structural view of an embodiment of a retainer ring of the needle gage adjustment mechanism according to the present invention;

FIG. 5 shows a schematic structural view of an embodiment of an eccentric bushing of the needle gage adjustment mechanism according to the present invention;

FIG. 6 shows a schematic structural view of an embodiment of a button shaft assembly of the gauge adjustment mechanism according to the present invention;

FIG. 7 is a schematic configuration diagram illustrating a first adjustment state of the pitch adjustment mechanism according to the present invention; and

fig. 8 shows a schematic structural view of a second adjustment state of the pitch adjustment mechanism according to the invention.

Wherein the figures include the following reference numerals:

10. an eccentric wheel assembly; 11. an eccentric shaft sleeve; 12. a toothed plate slideway body; 20. a main shaft; 30. a button shaft assembly; 31. adjusting the clamping plate; 310. a stopper portion; 311. an installation part; 32. a first section of button shaft; 33. a second section of button shaft; 34. a spring; 35. an annular projection; 40. a lower tool apron; 330. an operation slot; 13. a retainer ring; 130. connecting holes; 131. a connecting pin; 110. a groove; 120. a first slide body; 1201. a card slot; 1202. a stopper plate; 121. a second slide body; 14. an inner gear ring; 15. sector gear; 16. an inner ring gear seat; 17. a sector toothed plate.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The present invention provides a needle pitch adjusting mechanism, referring to fig. 1 to 8, for adjusting a needle pitch of a sewing machine, the needle pitch adjusting mechanism comprising: the eccentric wheel assembly 10 is used for driving the cloth feeding assembly to move during sewing so that the cloth feeding assembly drives the sewing material to move; the eccentric wheel assembly 10 comprises an eccentric shaft sleeve 11 and a toothed plate slideway body 12, wherein at least part of the eccentric shaft sleeve 11 is sleeved on the toothed plate slideway body 12; at least part of the main shaft 20 penetrates through the eccentric wheel assembly 10 and is connected with the eccentric wheel assembly 10 for transmission, and at least part of the main shaft 20 penetrates through a central hole of the toothed plate slide way body 12 and is fixedly connected with the eccentric shaft sleeve 11; the button shaft assembly 30, the button shaft assembly 30 is telescopically arranged at the side of the eccentric wheel assembly 10, the end of the button shaft assembly 30 is provided with an adjusting clamping plate 31, so that the button shaft assembly 30 is pressed to drive the adjusting clamping plate 31 to move towards the direction of the eccentric wheel assembly 10, the adjusting clamping plate 31 is pressed on the toothed plate slide rail body 12 to stop the toothed plate slide rail body 12 to rotate along with the main shaft 20, and the sewing needle pitch of the sewing machine is adjusted by adjusting the center distance between the eccentric shaft sleeve 11 and the toothed plate slide rail body 12.

The invention provides a stitch length adjusting mechanism, which comprises an eccentric wheel assembly 10, a main shaft 20 and a button shaft assembly 30, wherein at least part of the main shaft 20 penetrates through the eccentric wheel assembly 10 and is connected with the eccentric wheel assembly 10 for transmission, the eccentric wheel assembly 10 comprises an eccentric shaft sleeve 11 and a toothed plate slideway body 12, at least part of the main shaft 20 penetrates through a central hole of the toothed plate slideway body 12 and is fixedly connected with the eccentric shaft sleeve 11, at least part of the eccentric shaft sleeve 11 is sleeved on the toothed plate slideway body 12, the button shaft assembly 30 is telescopically arranged at the side of the eccentric wheel assembly 10, an adjusting clamping plate 31 is arranged at the end part of the button shaft assembly 30, so that the adjusting clamping plate 31 is driven by pressing the button shaft assembly 30 to move towards the direction of the eccentric wheel assembly 10 to stop the toothed plate slideway body 12 to rotate along with the main shaft 20, and the sewing stitch length of a sewing machine is adjusted by adjusting the central, the needle distance adjusting device is simple to operate, convenient to adjust, convenient to install and reduce the time for adjusting the needle distance, and solves the problem that the needle distance of a sewing machine in the prior art is inconvenient to adjust.

Specifically, as shown in fig. 2, the button shaft assembly 30 includes: the first section of button shaft 32, the adjusting catch plate 31 is installed at the end of the first section of button shaft 32; second section button axle 33, second section button axle 33 and first section button axle 32 are kept away from the one end of adjusting cardboard 31 and are connected to make first section button axle 32 drive through pressing second section button axle 33 and adjust cardboard 31 and move towards eccentric wheel assembly 10, through setting up both ends button axle, can at first assemble button axle subassembly 30 and install again on sewing machine, improve sewing machine's packaging efficiency.

Preferably, the first section of button shaft 32 is connected with the second section of button shaft 33 through screw threads, so that the connection is simple and reliable, and the disassembly is convenient.

When sewing machine normally works, in order to make button shaft assembly 30 keep away from eccentric wheel assembly 10 in order to prevent to influence normal sewing, the cover is equipped with spring 34 on second section button shaft 33, second section button shaft 33 is provided with annular arch 35 on keeping away from the axis body of first section button shaft 32, spring 34 one end butt is on annular arch 35, spring 34's the other end butt is on sewing machine's organism, promote second section button shaft 33 with the restoring force through spring 34 and remove, so that second section button shaft drives regulation cardboard 31 and keeps away from pinion rack slide body 12.

Specifically, the sewing machine further comprises a lower cutter holder 40, and when the whole sewing machine is assembled, the lower cutter holder 40 is not required to be installed in advance due to the fact that the button shaft assembly is of a split structure, so that installation of components such as a tooth frame, a guide plate or a baffle plate in the subsequent sewing machine is not influenced, and the installation efficiency of the whole sewing machine is improved.

In specific implementation, the first section of button shaft 32 is in threaded connection with the second section of button shaft 33, and an operation slot 330 is formed in one end of the second section of button shaft 33, which is far away from the first section of button shaft 32, so that the second section of button shaft 33 is driven to rotate by using an operation slot screwdriver matched with the operation slot 330, so that the first section of button shaft 32 and the second section of button shaft 33 are screwed together, and the second section of button shaft 33 is more conveniently connected to the first section of button shaft 32 by using the operation slot 330.

Screw hole has been seted up to the tip of first section button shaft 32, has seted up the clearing hole on the regulation cardboard 31, and connecting bolt's at least part passes clearing hole to screw hole in proper order in order to lock regulation cardboard 31 in the tip of first section button shaft 32, will adjust cardboard 31 through connecting bolt and install the tip at first section button shaft 32, and the installation is simple and convenient, has saved the equipment time of gauge needle regulation structure to it is firm to connect.

As shown in fig. 6, the adjusting catch plate 31 includes: a stopper 310 for stopping the toothed plate slide body 12; installation department 311 for be connected with button shaft subassembly 30, installation department 311 is including looks first plate body, second plate body and third plate body, first plate body and second plate body set up relatively, and the third plate body is located between first plate body and the second plate body, and first plate body and second plate body all are connected with the third plate body through the arc plate body to form between second plate body and dodge the region, in order to dodge eccentric wheel assembly 10, backstop portion 310 is installed on first plate body or second plate body.

As shown in fig. 3 to 5, the eccentric wheel assembly 10 further includes: the retainer ring 13 is sleeved on the main shaft 20 and fixedly connected with the eccentric shaft sleeve 11, and the main shaft 20 drives the eccentric shaft sleeve 11 to rotate through the retainer ring 13.

In this embodiment, the retainer ring 13 is provided with a connecting hole 130, and the retainer ring 13 is fixedly connected with the main shaft 20 through the connecting hole 130; the end face of the retainer ring 13 is provided with a connecting pin 131, the end face of the eccentric shaft sleeve 11 is provided with a groove 110 matched with the connecting pin 131, and the connecting pin 131 is clamped in the groove 110.

The groove 110 extends along the radial direction of the eccentric sleeve 11, so that the connecting pin 131 can be slidably clamped in the groove 110, when the needle pitch is adjusted, because the eccentric sleeve 11 and the retaining ring 13 rotate along with the main shaft, the center distance between the retaining ring 13 and the eccentric sleeve 11 can be changed, and at the moment, the connecting pin 131 slides in the groove 110, so that the eccentric sleeve 11 can be ensured to rotate along with the main shaft 20 through the retaining ring 13.

In the embodiment provided by the present invention, the tooth plate slide body 12 comprises; a clamping groove 1201 matched with the adjusting clamping plate 31 is arranged on the circumference of the first slide rail body 120, and a central hole for the main shaft 20 to penetrate through is formed in the first slide rail body 120; the second slideway body 121, the second slideway body 121 extends axially along the central hole of the first slideway body 120, the second slideway body 121 is an eccentric slideway body, and at least part of the main shaft 20 sequentially passes through the first slideway body 120 and the second slideway body 121; the eccentric shaft sleeve 11 is sleeved on the second slideway body 121, so that the sewing needle pitch of the sewing machine can be adjusted by adjusting the center distance between the second slideway body 121 and the eccentric shaft sleeve 11.

In the present embodiment, the eccentric wheel assembly 10 further includes: the inner gear ring 14, the inner gear ring 14 and the main shaft 20 are fixedly connected; the sector gear 15 is meshed with the inner gear ring 14, the sector gear 15 is connected with the toothed plate slideway body 12, and the sector gear 15 drives the toothed plate slideway body 12 to rotate by meshing the sector gear 15 with the inner gear ring 14; when the adjusting clamping plate 31 is clamped into the clamping groove 1201, at least part of the adjusting clamping plate 31 pushes the sector teeth 15 to slide along the radial direction of the inner gear ring 14 so that the sector teeth 15 are separated from the inner gear ring 14, so that the toothed plate slideway body 12 is fixed when the main shaft 20 is rotated, the inner gear ring 14 is installed on the inner gear ring seat 16, the inner gear ring 14 is fixedly connected with the main shaft 20 through the inner gear ring seat 16, and the sector teeth 15 are installed on the inner gear ring seat 16.

Specifically, the eccentric wheel assembly 10 further includes: one end face of the sector gear plate 17 is fixedly mounted on the sector gear 15, the other end face of the sector gear plate 17 is slidably mounted on the first slideway body 120, at least part of the circumferential end face of the sector gear plate 17 is located at the clamping groove 1201, and the adjusting clamping plate 31 pushes the sector gear plate 17 to slide along the radial direction of the inner gear ring 14 to drive the sector gear 15 to be separated from the inner gear ring 14.

A stop plate 1202 is disposed on a circumferential surface of the first slide rail body 120, the stop plate 1202 extends from the circumferential surface of the first slide rail body 120 along an axial direction of the first slide rail body 120 to stop the fanning tooth plate 17, an opening communicating with the slot 1201 is formed on the stop plate 1202, and at least a portion of the fanning tooth plate 17 is located at the opening.

Preferably, a spring is mounted on the main shaft 20, and the spring abuts against one end of the sector plate 17 far from the circumferential end surface so as to abut the sector plate 17 against the stop surface of the stop plate 1202 by using the restoring force of the spring when the main shaft 20 rotates; when the adjusting clamping plate 31 pushes the sector plate 17 to slide, the sector plate 17 drives the sector teeth 15 to be separated from the inner gear ring 14 through the compression spring.

In the above embodiment of the present invention, the eccentric shaft sleeve 11 includes the connecting portion and the eccentric portion, the connecting portion and the eccentric portion are an integral structure, at least a portion of the connecting portion is sleeved on the outer surface of the second slideway body 121, a hole center line of the connecting portion and a hole center line of the second slideway body 121 are located on the same straight line, at least a portion of the eccentric portion is connected with the retainer ring 13, a radial cross section of the eccentric portion is circular, and when a needle pitch is adjusted, a stroke of the cloth feeding assembly is changed by adjusting a radial distance between the hole center of the second slideway body 121 and a center of the eccentric portion, so as to achieve a purpose of adjusting the needle pitch.

The invention also provides a sewing machine which comprises a needle pitch adjusting mechanism, wherein the needle pitch adjusting mechanism is the needle pitch adjusting mechanism in the embodiment.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:

the invention provides a stitch length adjusting mechanism, which comprises an eccentric wheel assembly 10, a main shaft 20 and a button shaft assembly 30, wherein at least part of the main shaft 20 penetrates through the eccentric wheel assembly 10 and is connected with the eccentric wheel assembly 10 for transmission, the eccentric wheel assembly 10 comprises an eccentric shaft sleeve 11 and a toothed plate slideway body 12, at least part of the main shaft 20 penetrates through a central hole of the toothed plate slideway body 12 and is fixedly connected with the eccentric shaft sleeve 11, at least part of the eccentric shaft sleeve 11 is sleeved on the toothed plate slideway body 12, the button shaft assembly 30 is telescopically arranged at the side of the eccentric wheel assembly 10, an adjusting clamping plate 31 is arranged at the end part of the button shaft assembly 30, so that the adjusting clamping plate 31 is driven by pressing the button shaft assembly 30 to move towards the direction of the eccentric wheel assembly 10 to stop the toothed plate slideway body 12 to rotate along with the main shaft 20, and the sewing stitch length of a sewing machine is adjusted by adjusting the central, the operation is simple, the adjustment is convenient, the time for adjusting the needle pitch is reduced, the sewing efficiency of the sewing machine is improved, the button shaft adopts a split structure, the assembly for accommodating the second section of button shaft 33 is not required to be installed in advance when the sewing machine is assembled, the whole installation of the sewing machine is facilitated, and the installation efficiency is improved.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.