阅读说明：本技术 高度调节机构及具有其的缝纫机 (Height adjusting mechanism and sewing machine with same ) 是由 黄贤木 严海军 唐飞龙 鲍增金 黄玉敏 李健鹏 楼俏军 于 2019-02-22 设计创作，主要内容包括：本发明提供了一种高度调节机构及具有其的缝纫机。高度调节机构包括：调节组件,包括调节结构、曲柄轴及设置在曲柄轴上的过渡连接结构,调节结构带动曲柄轴沿第一预设方向转动,过渡连接结构包括与曲柄轴的轴线偏心设置的连接部；主轴,与曲柄轴平行；压脚组件,包括压脚和传动结构,传动结构带动压脚升降运动；主轴传动组件,传动结构通过主轴传动组件与主轴连接,主轴传动组件包括凸轮连接曲柄,凸轮连接曲柄与连接部连接并绕二者的连接处摆动；调节结构带动曲柄轴转动一定角度,以调整连接部与主轴的轴线之间的距离,进而调整凸轮连接曲柄的摆幅,以调整压脚运动的高度范围。本发明解决了现有技术中缝纫机的压脚高度的调节较为繁琐的问题。(The invention provides a height adjusting mechanism and a sewing machine with the same. The height adjustment mechanism includes: the adjusting assembly comprises an adjusting structure, a crankshaft and a transitional connecting structure arranged on the crankshaft, the adjusting structure drives the crankshaft to rotate along a first preset direction, and the transitional connecting structure comprises a connecting part eccentrically arranged with the axis of the crankshaft; a main shaft parallel to the crank shaft; the presser foot component comprises a presser foot and a transmission structure, and the transmission structure drives the presser foot to move up and down; the main shaft transmission assembly is connected with the main shaft through the main shaft transmission assembly, the main shaft transmission assembly comprises a cam connecting crank, and the cam connecting crank is connected with the connecting part and swings around the connecting part of the cam connecting crank and the connecting part; the adjusting structure drives the crank shaft to rotate for a certain angle so as to adjust the distance between the connecting part and the axis of the main shaft, and further adjust the swing amplitude of the cam connecting crank so as to adjust the height range of the presser foot movement. The invention solves the problem that the adjustment of the height of the presser foot of the sewing machine in the prior art is more complicated.)

1. A height adjustment mechanism for adjusting a height of a presser foot (41) of a sewing machine, characterized by comprising:

the adjusting assembly (20) comprises an adjusting structure (21), a crankshaft (22) and a transitional connecting structure (23) arranged on the crankshaft (22), the adjusting structure (21) drives the crankshaft (22) to rotate along a first preset direction, and the transitional connecting structure (23) comprises a connecting part (231) eccentrically arranged with the axis of the crankshaft (22);

a main shaft (30), the main shaft (30) being disposed in parallel with the crank shaft (22);

the presser foot assembly (40) comprises a presser foot (41) and a transmission structure (42) connected with the presser foot (41), and the transmission structure (42) drives the presser foot (41) to move up and down;

the main shaft transmission assembly (50), the transmission structure (42) is connected with the main shaft (30) through the main shaft transmission assembly (50), the main shaft transmission assembly (50) comprises a cam connecting crank (51), and the cam connecting crank (51) is connected with the connecting part (231) and swings around the connecting part of the connecting part and the connecting part;

the adjusting structure (21) drives the crank shaft (22) to rotate for a certain angle so as to adjust the distance between the connecting part (231) and the axis of the main shaft (30), and further adjust the swing amplitude of the cam connecting crank (51) so as to adjust the height range of the movement of the presser foot (41).

2. The height adjustment mechanism of claim 1, wherein the connecting portion (231) has a mounting hole, the transitional coupling structure (23) further comprising:

first connecting axle (232), first connecting axle (232) pass cam connection crank (51) after fix in the mounting hole, first connecting axle (232) with crank axle (22) parallel arrangement, cam connection crank (51) wind first connecting axle (232) can swing the setting.

3. The height adjustment mechanism of claim 1, wherein the spindle drive assembly (50) further comprises:

the eccentric wheel (52) is sleeved on the main shaft (30), and the eccentric wheel (52) rotates synchronously with the main shaft (30);

the eccentric wheel connecting rod (53) is arranged on the eccentric wheel (52), and the eccentric wheel connecting rod (53) is in pivot connection with the cam connecting crank (51) so as to drive the cam connecting crank (51) to swing;

a connecting rod (54), wherein a first end of the connecting rod (54) is pivotally connected with the eccentric wheel connecting rod (53), a second end of the connecting rod (54) is connected with the transmission structure (42), and the eccentric wheel connecting rod (53) drives the transmission structure (42) to move through the connecting rod (54) so as to drive the presser foot (41) to perform lifting movement through the transmission structure (42); wherein the cam connecting crank (51) is pivotally connected with the eccentric wheel connecting rod (53).

4. The height adjustment mechanism of claim 3, wherein the transmission structure (42) comprises:

a presser foot lifting crank (421) connected with the second end of the connecting rod (54);

a presser foot lifting crank shaft (422), wherein the presser foot lifting crank (421) is eccentrically arranged on the presser foot lifting crank shaft (422);

the presser foot lifting mechanism (423), the presser foot (41) is connected with the presser foot lifting crankshaft (422) through the presser foot lifting mechanism (423), and in the rotating process of the presser foot lifting crankshaft (422), the presser foot lifting crankshaft (422) drives the presser foot (41) to move up and down through the presser foot lifting mechanism (423).

5. The height adjustment mechanism of claim 1, wherein the adjustment structure (21) comprises a first cam (211), the adjustment assembly (20) further comprising:

the first protruding portion (24) is arranged on the crank shaft (22) and rotates the adjusting structure (21) to enable the first cam (211) to be in contact with the first protruding portion (24) and drive the first protruding portion (24) to rotate along the first preset direction, and therefore rotation of the crank shaft (22) is achieved.

6. The height adjustment mechanism according to claim 5, wherein the outer peripheral surface of the first cam (211) is a first arc-shaped surface, and the adjustment structure (21) further comprises:

a first operation knob (212);

a second connecting shaft (213), the first cam (211) being connected with the first operating knob (212) through the second connecting shaft (213) to rotate the first cam (211) around an axis of the second connecting shaft (213) by rotating the first operating knob (212); the center line of the first arc-shaped surface is parallel to the axis of the second connecting shaft (213) along the extending direction of the first arc-shaped surface, and the distance between the center line and the axis is gradually increased or decreased.

7. The height adjustment mechanism of claim 5, further comprising:

the auxiliary adjusting assembly (60) comprises an auxiliary adjusting structure (61) and a second protruding part (62) arranged on the crank shaft (22), and the auxiliary adjusting structure (61) and the second protruding part (62) are limited and stopped so that the crank shaft (22) can rotate within a preset angle.

8. The height adjustment mechanism according to claim 7, wherein the auxiliary adjustment structure (61) comprises:

a second operation knob (611);

a third connecting shaft (612);

a second cam (613) connected with the second operation knob (611) through the third connecting shaft (612) to rotate in a second preset direction by rotating the second operation knob (611) to rotate the second cam (613) about an axis of the third connecting shaft (612);

the outer peripheral surface of the second cam (613) is a second arc-shaped surface, the central line of the second arc-shaped surface is parallel to the axis of the third connecting shaft (612) along the extending direction of the second arc-shaped surface, and the distance between the central line and the axis is gradually increased or gradually decreased.

9. The height adjustment mechanism of claim 7, further comprising:

and a torsion spring (70) provided on the crank shaft (22), one torsion spring (70) arm of the torsion spring (70) being connected to the housing to prevent the crank shaft (22) from coming into play in a radial direction thereof.

10. The height adjustment mechanism of claim 9, wherein the torsion spring (70) is located between the first and second protrusions (24, 62), both ends of the torsion spring (70) abutting the first and second protrusions (24, 62), respectively.

11. A sewing machine, comprising a housing and a height adjustment mechanism, at least part of the height adjustment mechanism being located within the housing; wherein the height adjustment mechanism is as claimed in any one of claims 1 to 10.

Technical Field

The invention relates to the technical field of sewing machines, in particular to a height adjusting mechanism and a sewing machine with the same.

Background

At present, when a user uses a sewing machine, the height of the presser foot needs to be adjusted according to different requirements of sewing materials so as to enable the height of the presser foot to be suitable for the thickness of the sewing materials.

However, in the prior art, the adjustment of the height of the presser foot of the sewing machine is complicated and complicated, and the labor intensity of workers is increased.

Disclosure of Invention

The invention mainly aims to provide a height adjusting mechanism and a sewing machine with the same, and aims to solve the problems that in the prior art, the adjustment of the height of a presser foot of the sewing machine is complicated and complicated, and the labor intensity of workers is increased.

In order to achieve the above object, according to one aspect of the present invention, there is provided a height adjusting mechanism for adjusting a height of a presser foot of a sewing machine, the height adjusting mechanism including: the adjusting assembly comprises an adjusting structure, a crankshaft and a transitional connecting structure arranged on the crankshaft, the adjusting structure drives the crankshaft to rotate along a first preset direction, and the transitional connecting structure comprises a connecting part eccentrically arranged with the axis of the crankshaft; the main shaft is arranged in parallel with the crank shaft; the presser foot component comprises a presser foot and a transmission structure connected with the presser foot, and the transmission structure drives the presser foot to perform lifting motion; the main shaft transmission assembly is connected with the main shaft through the main shaft transmission assembly, the main shaft transmission assembly comprises a cam connecting crank, and the cam connecting crank is connected with the connecting part and swings around the connecting part of the cam connecting crank and the connecting part; the adjusting structure drives the crank shaft to rotate for a certain angle to adjust the distance between the connecting part and the axis of the main shaft, and further adjust the swing amplitude of the cam connecting crank to adjust the height range of the presser foot movement.

Further, the connecting portion has the mounting hole, and the transitional coupling structure still includes: the first connecting shaft penetrates through the cam connecting crank and then is fixed in the mounting hole, the first connecting shaft and the crank shaft are arranged in parallel, and the cam connecting crank is arranged around the first connecting shaft in a swinging mode.

Further, the spindle drive assembly further comprises: the eccentric wheel is sleeved on the main shaft and synchronously rotates along with the main shaft; the eccentric wheel connecting rod is arranged on the eccentric wheel and is in pivot connection with the cam connecting crank so as to drive the cam connecting crank to swing; the first end of the connecting rod is pivotally connected with the eccentric wheel connecting rod, the second end of the connecting rod is connected with the transmission structure, and the eccentric wheel connecting rod drives the transmission structure to move through the connecting rod so as to drive the presser foot to move up and down through the transmission structure; wherein the cam connecting crank is pivotally connected with the eccentric wheel connecting rod.

Further, the transmission structure includes: the presser foot lifting crank is connected with the second end of the connecting rod; the presser foot lifting crank shaft is eccentrically arranged on the presser foot lifting crank shaft; and the presser foot lifting mechanism is connected with the presser foot lifting crank shaft through the presser foot lifting mechanism, and the presser foot lifting crank shaft drives the presser foot to perform lifting motion through the presser foot lifting mechanism in the rotating process of the presser foot lifting crank shaft.

Further, the adjustment structure includes a first cam, and the adjustment assembly further includes: the first protruding portion is arranged on the crank shaft, so that the first cam is in contact with the first protruding portion and drives the first protruding portion to rotate along a first preset direction through the rotation adjusting structure, and rotation of the crank shaft is achieved.

Further, the outer peripheral face of first cam is first arcwall face, adjusts the structure and still includes: a first operation knob; the first cam is connected with the first operating knob through the second connecting shaft so as to rotate around the axis of the second connecting shaft by rotating the first operating knob; wherein, along the extending direction of first arcwall face, the central line of first arcwall face and the axis parallel arrangement of second connecting axle, the distance between central line and the axis crescent or reduce gradually.

Further, the height adjustment mechanism further comprises: the auxiliary adjusting assembly comprises an auxiliary adjusting structure and a second protruding portion arranged on the crank shaft, and the auxiliary adjusting structure and the second protruding portion limit stop are used for enabling the crank shaft to rotate within a preset angle.

Further, the auxiliary adjusting structure includes: a second operation knob; a third connecting shaft; the second cam is connected with the second operating knob through a third connecting shaft so as to rotate along a second preset direction by rotating the second operating knob, so that the second cam rotates around the axis of the third connecting shaft; the outer peripheral surface of the second cam is a second arc-shaped surface, the central line of the second arc-shaped surface is parallel to the axis of the third connecting shaft along the extending direction of the second arc-shaped surface, and the distance between the central line and the axis is gradually increased or gradually reduced.

Further, the height adjustment mechanism further comprises: and a torsion spring provided on the crank shaft, one torsion arm of the torsion spring being connected to the housing to prevent the crank shaft from coming into play in a radial direction thereof.

Further, the torsion spring is located between the first protruding portion and the second protruding portion, and two ends of the torsion spring are respectively abutted to the first protruding portion and the second protruding portion.

According to another aspect of the present invention, there is provided a sewing machine comprising a housing and a height adjustment mechanism, at least part of the height adjustment mechanism being located within the housing; wherein, the height adjustment mechanism is the height adjustment mechanism.

By applying the technical scheme of the invention, the adjusting assembly comprises an adjusting structure, the crank shaft and a transitional connecting structure arranged on the crank shaft, the adjusting structure drives the crank shaft to rotate along a first preset direction, and the transitional connecting structure comprises a connecting part eccentrically arranged with the axis of the crank shaft. The main shaft is arranged in parallel with the crank shaft. Like this, when the height of presser foot needs to be adjusted to the user, the operation is adjusted the structure, so that adjust the structure and drive the crank axle and rotate certain angle, and then the distance between the axis of adjustment connecting portion and main shaft, in order to realize the adjustment to the articulate range of oscillation of cam connection, and then the range of motion of the transmission structure that adjustment and presser foot are connected, the high scope of indirect adjustment presser foot motion, and then make the user more easy to the adjustment of presser foot height, only need to operate the regulation structure promptly and rotate along first predetermined direction can, it is comparatively loaded down with trivial details, complicacy to the regulation of presser foot height of sewing machine among the prior art to have solved, staff's intensity of labour's problem has been increased.

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 schematic perspective view of an embodiment of a height adjustment mechanism according to the present invention; and

fig. 2 shows a perspective view of another angle of the height adjustment mechanism of fig. 1.

Wherein the figures include the following reference numerals:

20. an adjustment assembly; 21. an adjustment structure; 211. a first cam; 212. a first operation knob; 213. a second connecting shaft; 22. a crank shaft; 23. a transitional connection structure; 231. a connecting portion; 232. a first connecting shaft; 24. a first protrusion; 30. a main shaft; 40. a presser foot assembly; 41. a presser foot; 42. a transmission structure; 421. a presser foot lifting crank; 422. a presser foot lifting crankshaft; 423. a presser foot lifting mechanism; 50. a spindle drive assembly; 51. the cam is connected with the crank; 52. an eccentric wheel; 53. an eccentric wheel connecting rod; 54. connecting the connecting rod; 60. an auxiliary adjustment assembly; 61. an auxiliary adjustment structure; 611. a second operation knob; 612. a third connecting shaft; 613. a second cam; 62. a second protrusion; 70. a torsion spring.

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.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present invention, unless stated to the contrary, use of the directional terms "upper and lower" are generally directed to the orientation shown in the drawings, or to the vertical, or gravitational direction; likewise, for ease of understanding and description, "left and right" are generally to the left and right as shown in the drawings; "inner and outer" refer to the inner and outer relative to the profile of the respective member itself, but the above directional terms are not intended to limit the present invention.

In order to solve among the prior art comparatively loaded down with trivial details, the complicacy of regulation to sewing machine's presser foot height, increased staff's intensity of labour's problem, this application provides a height adjusting mechanism and has its sewing machine.

As shown in fig. 1 and 2, the height adjusting mechanism is used for adjusting the height of the presser foot 41 of the sewing machine, and includes an adjusting assembly 20, a main shaft 30, a presser foot assembly 40 and a main shaft transmission assembly 50. Wherein, adjust subassembly 20 including adjusting structure 21, crank axle 22 and set up transition connection structure 23 on crank axle 22, adjust structure 21 and drive crank axle 22 and rotate along first predetermined direction, transition connection structure 23 includes the connecting portion 231 with the eccentric setting of the axis of crank axle 22. The main shaft 30 is disposed parallel to the crank shaft 22. The presser foot assembly 40 includes a presser foot 41 and a transmission structure 42 connected to the presser foot 41, and the transmission structure 42 drives the presser foot 41 to perform a lifting motion. The transmission structure 42 is connected with the main shaft 30 through a main shaft transmission assembly 50, the main shaft transmission assembly 50 comprises a cam connecting crank 51, and the cam connecting crank 51 is connected with the connecting part 231 and swings around the connecting part of the cam connecting crank 51 and the connecting part 231. The adjusting structure 21 drives the crank shaft 22 to rotate a certain angle to adjust the distance between the connecting portion 231 and the axis of the main shaft 30, and further adjust the swing of the cam connecting crank 51 to adjust the height range of the movement of the presser foot 41.

Use the technical scheme of this embodiment, when the user needs to adjust the height of presser foot 41, operation regulation structure 21, so that adjust structure 21 and drive crankshaft 22 and rotate certain angle, and then the distance between the axis of adjustment connecting portion 231 and main shaft 30, in order to realize the adjustment to the swing amplitude of cam connection crank 51, and then the motion amplitude of the transmission structure 42 of adjustment and presser foot 41 connection, the high range of indirect adjustment presser foot 41 motion, and then make the user more easy to the adjustment of presser foot height, only need to operate regulation structure 21 along first preset direction rotation can, it is comparatively loaded down with trivial details, complicated to the regulation of the presser foot height of sewing machine among the prior art to have solved, the problem of staff's intensity of labour has been increased.

In the present embodiment, the adjusting structure 21 drives the crank shaft 22 to rotate a certain angle to adjust the shortest distance between the connecting portion 231 and the axis of the main shaft 30, so as to adjust the swing of the cam connecting crank 51, and further adjust the height range of the movement of the presser foot 41.

As shown in fig. 2, the connecting portion 231 has a mounting hole, and the transitional coupling structure 23 further includes a first connecting shaft 232. The first connecting shaft 232 passes through the cam connecting crank 51 and then is fixed in the mounting hole, the first connecting shaft 232 is arranged in parallel with the crank shaft 22, and the cam connecting crank 51 is arranged around the first connecting shaft 232 in a swinging mode. In this way, the connecting portion 231 is connected with the cam connecting crank 51 through the first connecting shaft 232, so as to realize that the cam connecting crank 51 swings around the first connecting shaft 232, so as to control the swing amplitude of the cam connecting crank 51 by adjusting the shortest distance between the axis of the first connecting shaft 232 and the axis of the crank shaft 22, and further adjust the height range of the transmission structure 42 driving the presser foot 41 to move.

As shown in fig. 1 and 2, the spindle drive assembly 50 further includes an eccentric 52, an eccentric connecting rod 53, and a connecting rod 54. Wherein, the eccentric wheel 52 is sleeved on the main shaft 30, and the eccentric wheel 52 rotates synchronously with the main shaft 30. An eccentric connecting rod 53 is provided on the eccentric 52, and the eccentric connecting rod 53 is pivotally connected to the cam connecting crank 51 to swing the cam connecting crank 51. The first end of the connecting link 54 is pivotally connected to the eccentric link 53, the second end of the connecting link 54 is connected to the transmission structure 42, and the eccentric link 53 drives the transmission structure 42 through the connecting link 54 to drive the presser foot 41 to move up and down through the transmission structure 42. Wherein the cam connecting crank 51 is pivotally connected to the eccentric connecting rod 53. Thus, the arrangement ensures that the main shaft 30 can drive the cam connecting crank 51 to swing, so that the connecting link 54 drives the transmission structure 42 to move, and finally the presser foot 41 can move up and down along the height direction.

Specifically, when the main shaft 30 rotates, the main shaft 30 drives the eccentric wheel 52 to rotate, meanwhile, the eccentric wheel 52 drives the eccentric wheel connecting rod 53 to rotate, one end of the cam connecting crank 51 swings around the first connecting shaft 232, the other end of the cam connecting crank 51 is pivotally connected with the eccentric wheel connecting rod 53, the first end of the connecting rod 54 is pivotally connected with the connecting part of the cam connecting crank 51 and the eccentric wheel connecting rod 53, the second end of the connecting rod 54 is connected with the transmission structure 42 to drive the transmission structure 42 to move through the connecting rod 54, so as to drive the presser foot 41 connected with the transmission structure 42 to perform lifting motion, thereby ensuring that the height adjusting mechanism can normally operate, and improving the reliability of the height of the adjusting presser foot 41 of the height adjusting mechanism.

As shown in fig. 1 and 2, the transmission structure 42 includes a presser foot lifting crank 421, a presser foot lifting crank shaft 422, and a presser foot lifting mechanism 423. Wherein, the presser foot lifting crank 421 is connected with the second end of the connecting link 54. The presser foot lifting crank 421 is eccentrically disposed on the presser foot lifting crank shaft 422. The presser foot 41 is connected with the presser foot lifting crankshaft 422 through the presser foot lifting mechanism 423, and during the rotation of the presser foot lifting crankshaft 422, the presser foot lifting crankshaft 422 drives the presser foot 41 to perform lifting motion through the presser foot lifting mechanism 423. In this way, the connecting link 54 is pivotally connected to the presser foot lifting crank 421, and the presser foot lifting crank 421 is disposed on the presser foot lifting crank shaft 422, so as to drive the presser foot lifting crank shaft 422 to rotate through the presser foot lifting crank 421, and further drive the presser foot lifting mechanism 423 to move, thereby realizing the lifting movement of the presser foot 41.

Specifically, a preset distance is provided between the connection point of the connection link 54 and the presser foot lifting crank 421 and the axis of the presser foot lifting crank shaft 422, so that the presser foot lifting mechanism 423 drives the presser foot 41 to perform lifting movement by driving the presser foot lifting crank shaft 422 to eccentrically rotate through the connection link 54, and the lifting movement of the presser foot 41 by the height adjusting mechanism is further ensured.

As shown in fig. 1 and 2, the adjustment structure 21 includes a first cam 211, and the adjustment assembly 20 further includes a first protrusion 24. The first protruding portion 24 is disposed on the crank axle 22, so that the first cam 211 contacts the first protruding portion 24 and drives the first protruding portion 24 to rotate along a first predetermined direction by rotating the adjusting structure 21, so as to rotate the crank axle 22. Therefore, the structure is simple, the processing and the realization are easy, and the labor intensity of workers is reduced.

Specifically, when the operating height range of the presser foot 41 needs to be adjusted, the first cam 211 is operated to rotate the first cam 211 along the first preset direction, so as to drive the first protrusion 24 in contact with the first cam to move, thereby realizing the rotation of the crank shaft 22 around the axis direction thereof, so as to adjust the shortest distance between the axis of the first connecting shaft 232 and the axis of the main shaft 30, further adjust the swing amplitude of the cam connecting crank 51, and finally adjust the lifting height range of the presser foot 41.

As shown in fig. 1 and 2, the outer peripheral surface of the first cam 211 is a first arc-shaped surface, and the adjusting structure 21 further includes a first operating knob 212 and a second connecting shaft 213. Wherein the first cam 211 is connected with the first operation knob 212 through the second connection shaft 213, so that the first cam 211 is rotated about the axis of the second connection shaft 213 by rotating the first operation knob 212. Along the extending direction of the first arc-shaped surface, the center line of the first arc-shaped surface is parallel to the axis of the second connecting shaft 213, and the distance between the center line and the axis is gradually increased. Thus, the user can rotate the first cam 211 by screwing the first operating knob 212, so that the user can operate the adjusting structure 21 more easily and conveniently, and the operation difficulty is reduced.

Specifically, when the user rotates the first operation knob 212 in the counterclockwise direction, the first operation knob 212 drives the first cam 211 to rotate in the counterclockwise direction, and then the shortest distance between the center line of the first arc-shaped surface and the axis of the second connection shaft 213 is gradually increased to push the first protrusion 24 to rotate towards the direction away from the first cam 211, that is, the crank shaft 22 rotates in the clockwise direction, and then the shortest distance between the axis of the first connection shaft 232 and the axis of the main shaft 30 is decreased, so that the swing amplitude of the cam connection crank 51 is increased, the movement amplitude of the presser foot lifting crank 421 is increased, and the lifting height range of the presser foot 41 is increased; conversely, the range of the elevation height of the presser foot 41 is reduced.

As shown in fig. 1 and 2, the height adjustment mechanism further includes an auxiliary adjustment assembly 60. The auxiliary adjusting assembly 60 includes an auxiliary adjusting structure 61 and a second protrusion 62 disposed on the crank shaft 22, wherein the auxiliary adjusting structure 61 and the second protrusion 62 limit the stop to allow the crank shaft 22 to rotate within a predetermined angle. In this way, the user can adjust the maximum rotation angle of the crank shaft 22 by adjusting the auxiliary adjusting assembly 60 so that the crank shaft 22 rotates within a preset angle range.

As shown in fig. 1, the auxiliary adjusting structure 61 includes a second operating knob 611, a third connecting shaft 612, and a second cam 613. Wherein the second cam 613 is connected with the second operation knob 611 through the third connecting shaft 612 to rotate in the second preset direction by rotating the second operation knob 611, so that the second cam 613 rotates about the axis of the third connecting shaft 612. The outer peripheral surface of the second cam 613 is a second arc surface, and along the extending direction of the second arc surface, the central line of the second arc surface is parallel to the axis of the third connecting shaft 612, and the distance between the central line and the axis gradually increases or gradually decreases. Thus, the auxiliary adjusting structure 61 can be operated more easily and conveniently by a user through the arrangement, and the labor intensity of workers is reduced.

Specifically, before the user adjusts the lifting height range of the presser foot 41, the second operation knob 611 is operated to rotate the second cam 613 by the second operation knob 611 and rotate to the preset position. Then, the user screws the first operation knob 212 and rotates the first operation knob by a certain angle to drive the first protrusion 24 to rotate through the first cam 211, and when the first protrusion 24 drives the crank shaft 22 to rotate to the limit stop of the second protrusion 62 and the second cam 613, the crank shaft 22 stops rotating, and the swing of the cam connecting crank 51 is adjusted to adjust the lifting height of the presser foot 41.

As shown in fig. 1 and 2, the height adjustment mechanism further includes a torsion spring 70. Wherein the torsion spring 70 is provided on the crank shaft 22, and one torsion spring 70 arm of the torsion spring 70 is connected to the housing to prevent the crank shaft 22 from moving in a radial direction thereof. Thus, when the user operates the adjusting structure 21 or the auxiliary adjusting assembly 60, or the main shaft 30 rotates, the torsion spring 70 can prevent the crank shaft 22 from moving in the radial direction, thereby improving the operation stability and the operation reliability of the height adjusting mechanism. Wherein, the torsion spring 70 is located between the first protruding portion 24 and the second protruding portion 62, and both ends of the torsion spring 70 are respectively abutted against the first protruding portion 24 and the second protruding portion 62.

The present application further provides a sewing machine (not shown) comprising a housing and a height adjustment mechanism, at least a portion of the height adjustment mechanism being located within the housing. Wherein, the height adjustment mechanism is the height adjustment mechanism.

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

when the height of presser foot needs to be adjusted to the user, the operation is adjusted the structure, so that adjust the structure and drive the crank axle and rotate certain angle, and then the distance between the axis of adjustment connecting portion and main shaft, in order to realize the adjustment to the articulate range of oscillation of cam connection, and then the range of motion of the transmission structure that adjustment and presser foot are connected, the high scope of indirect adjustment presser foot motion, and then make the user more easy to the adjustment of presser foot height, only need operate the regulation structure promptly and rotate along first preset direction can, it is comparatively loaded down with trivial details, complicacy to the regulation of the presser foot height of sewing machine among the prior art to have solved, staff's intensity of labour's problem has been increased.

It is to be understood that the above-described embodiments are only a few, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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.