CN214300656U - Pressure regulating mechanism and sewing machine - Google Patents

Abstract

The utility model relates to a pressure regulating mechanism and sewing machine. The pressure regulating mechanism is used for regulating the pressure value of a presser foot pressure regulating mechanism in the sewing machine, and comprises a driving source, a driving element and a first driving assembly, wherein the first driving assembly is connected with the presser foot pressure regulating mechanism, and the pressure regulating mechanism comprises: the driving element is connected to an output end of the driving source and can rotate along with the driving source; the drive element includes a first region that acts on the first drive assembly and adjusts a pressure value of the presser foot pressure adjustment mechanism. The pressure regulating mechanism is arranged, so that the sewing machine with the pressure regulating mechanism can accurately and conveniently regulate the presser foot pressure regulating mechanism.

Description

Pressure regulating mechanism and sewing machine

Technical Field

The utility model relates to a sewing machine technical field especially relates to a pressure regulating mechanism and sewing machine.

Background

The inside of the existing sewing machine often comprises a plurality of motion mechanisms for realizing different functions, such as a cloth feeding mechanism, a presser foot mechanism, a thread cutting mechanism, a lubricating mechanism and the like, and the motion mechanisms are coordinated and matched to complete the complete sewing function of the sewing machine. In the sewing machine, the main function of the presser foot mechanism is to complete the dragging of the cloth by matching with the feed dog frame in the feeding process, and to press the cloth in the sewing process so as to smoothly complete the sewing work, and to lift the presser foot plate after the sewing is completed so as to perform the action of taking or adding the material.

The presser foot mechanism also comprises a presser foot lifting mechanism for pressing and lifting the presser foot plate and a presser foot pressure adjusting mechanism for adjusting the pressure of the presser foot plate. The presser foot pressure adjusting mechanism is used for adjusting the pressure value of the presser foot lifting mechanism, so that the presser foot lifting mechanism has a corresponding pressure value in a pressing-down state or a presser foot lifting state. The existing presser foot pressure adjusting mechanism in the sewing machine has the problems of low adjusting precision, complex adjusting process and the like.

SUMMERY OF THE UTILITY MODEL

In view of the above, there is a need to provide an improved pressure regulating mechanism and sewing machine. An embodiment of the utility model provides a pressure regulating mechanism. The pressure regulating mechanism is arranged, so that the sewing machine with the pressure regulating mechanism can accurately and conveniently regulate the pressure adjusting mechanism.

A pressure regulating mechanism for regulating a pressure value of a presser foot pressure regulating mechanism in a sewing machine, the pressure regulating mechanism comprising a drive source, a drive element and a first drive assembly connected to the presser foot pressure regulating mechanism, wherein:

the driving element is connected to an output end of the driving source and can rotate along with the driving source;

the drive element includes a first region that acts on the first drive assembly and adjusts a pressure value of the presser foot pressure adjustment mechanism.

Further, the first region includes a pressure adjusting region, and the pressure foot pressure adjusting mechanism is capable of changing a pressure value by the first drive assembly under rotation of the drive element when the pressure adjusting region acts on the first drive assembly.

Further, the first area also comprises a first idle area, and the first idle area is connected with the pressure regulating area; when the first idle running region acts on the first driving component, the pressure foot pressure adjusting mechanism can maintain a minimum pressure value through the first driving component under the rotation of the driving element.

Further, the distance between the pressure-adjusting area and the rotation point of the driving element gradually increases in a direction away from the first idle area.

Further, the driving element includes a first cam connected to an output end of the driving source; the first region is formed on the first cam.

Furthermore, the first driving assembly comprises a pressure regulating crank and a first driving shaft, one end of the pressure regulating crank is abutted against the first area, and the other end of the pressure regulating crank is in circumferential linkage with one end of the first driving shaft; the first driving shaft is rotatably connected to a shell of the sewing machine, and the other end of the first driving shaft is hinged to the presser foot pressure adjusting mechanism;

the pressure regulating crank can swing around the axis of the first driving shaft along with the first area under the rotation of the driving element, and the pressure value of the presser foot pressure regulating mechanism is regulated through the first driving shaft.

Furthermore, the first driving assembly further comprises a pressure regulating connecting rod, a pressure regulating lever and a driving sliding block, and two ends of the pressure regulating connecting rod are hinged to the first driving shaft and the pressure regulating lever;

the middle of the pressure regulating lever is hinged to the sewing machine shell, one end of the pressure regulating lever is hinged to the position, relatively far away from the pressure regulating crank, of the first driving shaft, and the other end of the pressure regulating lever is hinged to the driving slide block;

the driving sliding block is connected with the presser foot pressure adjusting mechanism in a sliding mode and can slide relative to the presser foot pressure adjusting mechanism along a first direction;

the first driving shaft drives the pressure regulating lever to rotate around a hinge point through the pressure regulating connecting rod, and the pressure value of the presser foot pressure regulating mechanism is regulated along a first direction.

Furthermore, a swing rod part is arranged at one end, relatively far away from the pressure regulating crank, of the first driving shaft, the first driving assembly further comprises a pressure regulating lever, the middle of the pressure regulating lever is hinged to the sewing machine shell, and two ends of the pressure regulating lever are respectively connected to the swing rod part and the pressure foot pressure regulating mechanism in a sliding mode;

the first driving shaft rotates and drives the pressure regulating lever to rotate around a hinge point through the swing rod part so as to regulate the pressure value of the pressure foot pressure regulating mechanism.

Furthermore, the first driving assembly further comprises a pressure regulating lever, the middle of the pressure regulating lever is hinged to the sewing machine shell, one end of the pressure regulating lever is fixedly connected to one end, relatively far away from the pressure regulating crank, of the first driving shaft, and the other end of the pressure regulating lever is connected to the presser foot pressure regulating mechanism in a sliding mode;

the first driving shaft rotates, and the pressure regulating lever is driven to rotate around a hinge point through the first driving shaft so as to regulate the pressure value of the presser foot pressure regulating mechanism.

The utility model discloses an embodiment still provides a sewing machine, sewing machine includes presser foot pressure adjustment mechanism and pressure regulating mechanism, pressure regulating mechanism be as above-mentioned arbitrary one pressure regulating mechanism.

Drawings

FIG. 1 is a schematic view of a sewing machine according to an embodiment of the present invention;

FIG. 2 is a schematic view of the sewing machine of FIG. 1 with some components omitted;

FIG. 3 is an enlarged schematic view of the sewing machine of FIG. 2 at A;

FIG. 4 is a schematic view of a drive element of the sewing machine of FIG. 1;

FIG. 5 is a schematic view of the drive source rotation region corresponding to the functional region of the drive element shown in FIG. 4;

FIG. 6 is a schematic structural view of a pressure regulating mechanism and other mechanisms of the sewing machine according to another embodiment of the present invention;

FIG. 7 is a schematic view of a drive element of the sewing machine of FIG. 6;

FIG. 8 is a schematic view of the drive source rotation region corresponding to the functional region of the drive element shown in FIG. 7;

FIG. 9 is a schematic structural view of a pressure regulating mechanism and other mechanisms of the sewing machine according to another embodiment of the present invention;

FIG. 10 is a schematic view of a drive element of the sewing machine of FIG. 9;

fig. 11 is a schematic view of the drive source rotation region corresponding to the functional region of the drive element shown in fig. 10.

Description of the element reference numerals

100. A sewing machine; 10. a housing; 11. a fixing member; 111. a limiting groove; 12. a needle plate; 20. a presser foot lifting mechanism; 21. a presser foot shaft; 22. a presser foot arm; 23. a foot pressing plate; 30. a presser foot pressure adjusting mechanism; 31. adjusting a rod; 311. a limiting part; 312. a guide portion; 3121. a guide groove; 313. a connecting shaft; 32. a pressure regulating elastic member; 33. a pressure lever; 40. a pressure regulating mechanism; 41. a drive source; 42. 42a, 42b, drive elements; 421. 421a, a first cam; 4211. a first region; 42111. a pressure adjusting area; 42112. a first blank area; 422. Rotating points; 43. a first drive assembly; 431. a pressure regulating crank; 432. a first drive shaft; 433. a pressure regulating connecting rod; 434. a pressure regulating lever; 435. driving the slide block; 43a, a first drive assembly; 431a, a pressure regulating crank; 4311a, pressure regulating roller; 432a, a first drive shaft; 4321a, a swing link part; 433a, a pressure regulating lever; 4331a, a first chute; 4332a, a first chute; 43b, a first drive assembly; 431b, a pressure regulating crank; 432b, a first drive shaft; 433b, an abutting assembly; 4331b, a contact plate; 4332b, pressure regulating roller; 434b, a pressure regulating lever.

The present invention is described in further detail with reference to the drawings and the detailed description.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the following detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, 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 invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a sewing machine 100 according to an embodiment of the present invention; FIG. 2 is a schematic view of the sewing machine 100 shown in FIG. 1 with some elements omitted;

an embodiment of the present invention provides a sewing machine 100, including casing 10, main shaft (not numbered), presser foot mechanism, cloth feeding mechanism (not numbered) and aircraft nose (not shown), the main shaft sets up in the inside of casing 10 and is connected in cloth feeding mechanism and aircraft nose, presser foot mechanism, cloth feeding mechanism and aircraft nose all set up in casing 10 encloses the space of establishing formation, presser foot mechanism sets up and is close to the aircraft nose setting with cloth feeding mechanism relatively.

The shell 10 is used for bearing a main shaft, a presser foot mechanism, a cloth feeding mechanism and a machine head, the main shaft is connected with a power source (not shown) and can drive the cloth feeding mechanism and the machine head to operate under the action of the power source, the presser foot mechanism is used for pressing cloth conveyed by the cloth feeding mechanism so as to improve the quality of sewing processing, the cloth feeding mechanism is used for conveying the cloth to be processed, and the machine head is used for sewing the cloth conveyed by the cloth feeding mechanism. The main shaft drives the cloth feeding mechanism to convey the cloth in a reciprocating mode, and then the press foot mechanism appropriately tensions the cloth, so that the machine head can sew the cloth in a good tensioning state, and the sewing process of the sewing machine 100 is completed.

Of course, in addition to the above-mentioned housing 10, main shaft, presser foot mechanism, cloth feeding mechanism and head, the sewing machine 100 may further include auxiliary mechanisms such as thread passing mechanism and lubricating mechanism to smoothly complete the sewing process of the overedger, which is not described herein again.

The presser foot mechanism includes a presser foot lifting mechanism 20 and a presser foot pressure adjusting mechanism 30. The presser foot lifting mechanism 20 and the presser foot pressure adjusting mechanism 30 are both arranged in the shell 10 and are arranged opposite to the cloth feeding mechanism; the presser foot pressure adjusting mechanism 30 abuts against the presser foot lifting mechanism 20. The presser foot lifting mechanism 20 is used for pressing or releasing the cloth so as to facilitate sewing, adding or picking up the cloth; the presser foot pressure adjusting mechanism 30 is used for adjusting the pressure value of the presser foot lifting mechanism 20 for pressing the cloth, so that the pressing tightness degree of the cloth can be correspondingly adjusted, and the sewing machine is suitable for sewing the cloth made of different materials.

The presser foot lifting mechanism 20 includes a presser foot shaft 21, a presser foot arm 22, and a presser foot plate 23. The presser foot shaft 21 is rotatably connected in the housing 10 and rotates about its own axis; one end of the presser arm 22 is connected to the presser shaft 21 and swings around the axis of the presser shaft 21 along with the rotation of the presser shaft 21; a presser foot plate 23 is attached to one end of the presser arm 22 relatively distant from the presser shaft 21 and is disposed opposite to the needle plate 12 of the housing 10. The presser foot shaft 21 is used for connecting the driving end and rotating around the axis of the presser foot shaft; the presser foot arm 22 is used for transmitting the rotation of the presser foot shaft 21 to the presser foot plate 23; the presser foot plate 23 is used to hold the cloth on the needle plate 12. When the drive end drives the presser foot shaft 21 to rotate, the presser foot shaft 21 drives the presser foot arm 22 to lift up or swing down, thereby pressing the presser foot plate 23 against the upper surface of the needle plate 12 or lifting the presser foot plate 23 away from the needle plate 12.

The action of lifting the presser foot plate 23 in the direction away from the needle plate 12 is driven by the presser foot shaft 21 and the presser foot arm 22, which is referred to as the presser foot lifting action hereinafter and corresponds to the state of lifting the presser foot plate 23; alternatively, the presser foot plate 23 is pushed down toward the needle plate 12 by the presser shaft 21 and the presser arm 22, and the presser foot plate 23 moves toward the needle plate 12. The two types of presser foot plates 23 are in a state of being in a process of being lifted up or pressed down, and are both referred to as a presser foot lifting state. The position where presser foot shaft 21 and presser foot arm 22 are kept stationary and presser foot plate 23 is always at the lowest point is referred to as a pressed-down state.

The presser foot pressure adjusting mechanism 30 includes an adjusting lever 31, a pressure adjusting elastic member 32, and a pressing lever 33. The adjusting rod 31 is slidably connected in the fixing member 11 of the housing 10 of the sewing machine 100, and one end of the adjusting rod 31 extending out of the fixing member 11 is connected with the driving end, and the other end is abutted against the pressure regulating elastic member 32; two ends of the pressure regulating elastic piece 32 respectively abut against the adjusting rod 31 and the pressure rod 33; one end of the pressure lever 33 is disposed at the end of the pressure-regulating elastic member 32 relatively far from the driving end, and the other end presses against the pressure-regulating arm 22. The pressure-regulating elastic member 32 is used for providing different pressure values to the pressure lever 33 according to its own variable compression amount; the pressing rod 33 is used for pressing against the pressing foot arm 22, so that the pressure of the pressure regulating elastic piece 32 can be transmitted to the pressing foot arm 22, and the pressure value of the pressing foot plate 23 can be regulated.

It is understood that in other embodiments, the pressure rod 33 may also act on the foot pressing plate 23 and directly control the pressure value of the foot pressing plate 23, as long as the pressure value of the foot pressing plate 23 can be adjusted.

When the driving end compresses the pressure regulating elastic piece 32 through the adjusting rod 31, the abutting force of the pressure regulating elastic piece 32 on the pressure foot arm 22 through the pressure rod 33 is increased, so that the pressure value of the pressure foot arm 22 on the pressure foot plate 23 is correspondingly increased; when the driving end reduces the compression of the pressure regulating elastic piece 32 through the adjusting rod 31, the compression amount of the pressure regulating elastic piece 32 per se is reduced, and further the abutting force of the pressure lever 33 on the pressure foot arm 22 is relatively reduced, so that the pressure value of the pressure foot arm 22 on the pressure foot plate 23 is correspondingly reduced.

In one embodiment, the adjustment lever 31 is a substantially rod-shaped member slidably disposed through the fixing member 11 of the housing 10 of the sewing machine 100. The adjusting lever 31 has a stopper 311 at its outer periphery to be engaged with the fixing member 11 of the housing 10 of the sewing machine 100. Correspondingly, the fixing member 11 of the housing 10 is provided with a limiting groove 111 matching with the guiding portion 312. The limiting portion 311 is engaged with the limiting groove 111 and limits the rotation of the adjusting lever 31 in the circumferential direction, so that the adjusting lever 31 can stably abut against and change the compression amount of the pressure regulating elastic member 32 during the movement, and presses the pressing lever 33 to the presser foot arm 22 in the first direction. The stopper 311 restricts the circumferential rotation of the adjustment lever 31 relative to the housing 10 of the sewing machine 100.

The first direction is a direction forming an angle of 100 to 150 degrees with the foot pressing plate 23. It is understood that the angle between the first direction and footpad 23 may be other angles as long as the component of the first direction can be made to have a direction perpendicular to footpad 23.

The magnitude of the force of the presser foot shaft 21 in the presser foot lifting mechanism 20 for driving the presser foot plate 23 to lift and press down is related to the pressure value of the pressure regulating elastic member 32 to the presser foot arm 22 through the pressing rod 33. When the pressure value of the presser foot pressure adjusting mechanism 30 to the presser foot arm 22 is minimum, the acting force of the presser foot lifting mechanism 20 for lifting or pressing the presser foot plate 23 is minimum; when the pressure value of the presser foot pressure adjusting mechanism 30 to the presser foot arm 22 is maximum, the acting force for lifting or pressing the presser foot plate 23 by the presser foot lifting mechanism 20 is maximum.

The presser foot lifting mechanism and the presser foot pressure adjusting mechanism in the existing sewing machine structure are generally adjusted by independent driving sources, and a plurality of driving sources are simultaneously installed in the sewing machine, so that the development of the sewing machine towards miniaturization and low cost is not facilitated, and the pressure value of the presser foot pressure adjusting mechanism to a presser foot arm cannot be ensured when the state of the presser foot lifting mechanism needs to be switched.

In order to improve the convenience of adjusting the presser foot plate by the sewing machine 100 and meet the development requirement of miniaturization of the sewing machine 100, a pressure adjusting mechanism 40 is further arranged in the sewing machine 100. The pressure adjusting mechanism 40 is connected to the presser foot pressure adjusting mechanism 30, and can adjust the pressure value to the presser foot lifting mechanism 20 under the action of the driving source 41, so that the presser foot pressure adjusting mechanism 30 can be accurately and conveniently adjusted to an appropriate pressure value.

The embodiment of the pressure regulating mechanism 40 is specifically explained by the following three examples.

Example one

Referring to fig. 3 and 4 together, fig. 3 is an enlarged schematic view of the sewing machine 100 shown in fig. 2 at a point a; fig. 4 is a schematic view of the driving member 42 of the sewing machine 100 shown in fig. 1.

As shown in fig. 1 and 2, the pressure regulating mechanism 40 includes a driving source 41, a driving element 42, and a first driving unit 43. The driving element 42 is connected to an output end of the driving source 41; the first driving assembly 43 is connected to different regions of the driving element 42, and the first driving assembly 43 is correspondingly connected to the pressure regulating elastic member 32 of the presser foot pressure adjusting mechanism 30. The driving element 42 is used for outputting power to the first driving component 43 and controlling the first driving component 43 to correspondingly actuate under the action of different areas; the first drive assembly 43 serves as a drive end of the presser foot pressure adjustment mechanism 30.

When the output end of the driving source 41 drives the driving element 42 to rotate, different regions of the driving element 42 act on the first driving assembly 43, so as to adjust the pressure value of the presser foot pressure adjusting mechanism 30 on the presser foot lifting mechanism 20.

Specifically, the drive element 42 includes a first region 4211. The first region 4211 acts on the first drive assembly 43 and adjusts the pressure of the presser foot pressure adjustment mechanism 30.

In the present embodiment, as shown in fig. 2, the driving member 42 includes a first cam 421. The first cam 421 is connected to an output end of the driving source 41 and rotates with the output end. The first region 4211 corresponds to an outer profile formed in the first cam 421; the first cam 421 abuts against the first driving member 43. The first region 4211 of the first cam 421 is used to drive the first drive assembly 43. The output end of the driving source 41 is disposed through the first cam 421, and drives the first cam 421 to rotate, so as to drive the first driving assembly 43 to operate correspondingly.

It should be noted that: the first cam 421 is a driving member, and its contour determines the motion law of a driven member engaged therewith, and the first region 4211 of the driving element 42 acts on the corresponding first driving assembly 43, which is the engagement motion of the driven member changing its motion trajectory based on the contour of the cam member. In the present embodiment, the contour shape refers to the outer contour shape of the first cam 421, and it is understood that in other embodiments, the contour shape may also be the shape of a groove or a hole opened in the first cam 421.

The first cam 421 has a substantially cam shape. The first region 4211 includes a pressure adjustment region 42111 and a first blank region 42112. Pressure regulation zone 42111 is connected to first idling zone 42112. The first idle zone 42112 is a circular arc curve with the rotation point 422 of the first cam 421 as the center; the distance between the pressure adjusting region 42111 and the rotation point 422 of the first cam 421 gradually increases in a direction away from the first idling region 42112. The pressure adjusting area 42111 is used for driving the first driving component 43 to operate and changing the pressure value of the pressure foot lifting mechanism 20 by the pressure foot pressure adjusting mechanism 30; the first idling region 42112 is used to operate the first drive assembly 43 and maintain the pressure value of the presser foot pressure adjustment mechanism 30 at a minimum value.

It is to be construed that the rotation points are the respective central rotation points of the elements. In the present embodiment, the rotation points 422 of the first cam 421 and the first cam 421 are both positions where the axis of the output end of the driving source 41 is located.

When the abutting area between the first driving assembly 43 and the first cam 421 is continuously located in the first idle zone 42112, the abutting positions of the first driving assembly 43 and the first cam 421 are always kept at the same height during the rotation of the first cam 421, and the compression value of the pressure regulating elastic member 32 correspondingly connected to the first driving assembly 43 is kept unchanged. When the abutting area between the first driving assembly 43 and the first cam 421 moves from the first idle area 42112 to the pressure adjusting area 42111, since the distance between the pressure adjusting area 42111 and the rotation point 422 of the first cam 421 gradually increases along the direction away from the first idle area 42112, the height position of one end of the first driving assembly 43 can be changed during the rotation of the first cam 421, so as to drive the pressure adjusting elastic member 32 connected with the first driving assembly 43 to further compress, and change the pressure value of the presser foot pressure adjusting mechanism 30 on the presser foot lifting mechanism 20.

In one embodiment, the first drive assembly 43 includes a pressure adjustment crank 431 and a first drive shaft 432. One end of the pressure regulating crank 431 is pressed against the first area 4211 of the first cam 421, and the other end is linked with the first driving shaft 432 in the circumferential direction; the first driving shaft 432 is rotatably coupled to the inside of the housing 10 of the sewing machine 100, and the other end thereof is coupled to the pressure-adjusting elastic member 32. The pressure-adjusting crank 431 engages with the first driving shaft 432 and changes the amount of compression of the pressure-adjusting elastic member 32.

It should be explained that: the circumferential linkage means that the movement of the pressure regulating crank 431 can drive the first driving shaft 432 to rotate along the axis of the first driving shaft 432; or the first drive shaft 432 can drive the elements connected to its outer periphery to rotate or oscillate along the axis of the first drive shaft 432.

In one embodiment, the first driving assembly 43 further comprises a pressure regulating link 433 and a pressure regulating lever 434. Two ends of the pressure regulating connecting rod 433 are respectively hinged to one end of the first driving shaft 432, which is relatively far away from the pressure regulating crank 431, and the pressure regulating lever 434; both ends of the pressure adjusting lever 434 are hinged to the pressure adjusting link 433 and the pressure adjusting elastic member 32, respectively, and a certain position in the middle of the pressure adjusting lever 434 is hinged to the housing 10 of the sewing machine 100. The pressure adjusting link 433 for transmitting the power of the first driving shaft 432 to the pressure adjusting lever 434; the pressure adjusting lever 434 is used to change the force application direction and the arm of the first driving shaft 432 to the pressure adjusting elastic member 32. With such an arrangement, the first driving assembly 43 can accurately control the pressure value of the presser foot pressure adjusting mechanism 30 in a limited installation space.

In the present embodiment, the pressure adjusting lever 434 is substantially in the shape of an "L". The specific shape thereof is set according to the installation space, and is not particularly limited herein.

In one embodiment, the first drive assembly 43 further includes a drive slide 435. The pressure-regulating lever 434 is correspondingly hinged to the driving slider 435. Correspondingly, one end of the adjusting rod 31 relatively far away from the pressure regulating elastic piece 32 is provided with a square block-shaped guide part 312, and the guide part 312 is provided with a guide groove 3121 along the first direction. The driving slider 435 is fitted into the guide groove 3121 and can correspondingly guide one end of the pressure adjusting lever 434 to slide in the first direction within the guide portion 312. The engagement of the driving slider 435 with the guide groove 3121 serves to release the force of the pressure adjusting lever 434 in the first direction. The driving slider 435 is arranged such that the force applied to the adjustment lever 31 by the pressure adjustment lever 434 in the first direction is released by the sliding movement of the driving slider 435 in the first direction, so that the force applied to the adjustment lever 31 by the pressure adjustment lever 434 in the first direction is released.

Since the pressure adjusting elastic member 32 in the presser foot pressure adjusting mechanism 30 has a biasing force against the first driving unit 43, the pressure adjusting crank 431 of the first driving unit 43 can be always kept in a state of biasing against the first cam 421.

In the present embodiment, the pressure regulating crank 431 is abutted against the upper side of the cam member. When the pressure regulating crank 431 abuts against the pressure regulating area 42111 of the first cam 421, one end of the pressure regulating crank 431 moves in the direction far away from or close to the rotating point 422 of the first cam 421 under the rotation of the first cam 421, and the pressure regulating crank swings around the axis of the first driving shaft 432 to drive the first driving shaft 432 to move around the axis of the first driving shaft 432; the first driving shaft 432 drives the pressure adjusting lever 434 to rotate around the hinge point through the pressure adjusting connecting rod 433, and drives the adjusting rod 31 to move in a direction away from or close to the presser foot arm 22 along the first direction, so that the compression amount of the pressure adjusting elastic member 32 is changed, and the pressure value of the pressure lever 33 to the presser foot arm 22 is changed correspondingly. When the pressure adjusting crank 431 abuts against the position closest to the rotating point 422 of the first cam 421, the pressure adjusting lever 434 drives the adjusting rod 31 to move to the highest position, and at this time, the compression amount of the pressure adjusting elastic member 32 is the minimum, and the pressure of the presser foot pressure adjusting mechanism 30 on the presser foot arm 22 is the minimum pressure value. When the contact area between the pressure adjusting crank 431 and the first cam 421 is transferred to the first idle area 42112, the first idle area 42112 acts on the pressure adjusting crank 431, so that the position of the pressure adjusting crank 431 is kept unchanged and is always at the position closest to the rotation point 422 of the first cam 421, and the pressure of the presser foot pressure adjusting mechanism 30 on the presser foot arm 22 is maintained at the minimum pressure value. When the sewing machine 100 is operated without load, if the presser foot lifting mechanism 20 is in a pressing-down state at this time, the pressure value of the presser foot pressure adjusting mechanism 30 is maintained at the minimum value, so that excessive wear of parts such as the feed dog and the presser foot plate 23 can be effectively prevented, and the presser foot lifting mechanism 20 can lift the presser foot plate 23 with only a small driving force.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating a rotation area of the driving source 41 corresponding to a functional area of the driving element 42 shown in fig. 4.

The working principle of the pressure regulating mechanism 40 is explained in detail as follows:

the first cam 421 can change the pressure value of the presser foot pressure adjusting mechanism 30 in response to the rotation of the driving source 41. Specifically, referring to reference numerals in fig. 4 and 5, the functional region of the first cam 421 includes a pressure adjusting region 42111 and a first idling region 42112. In the initial state, pressure adjustment crank 431 is held in pressure adjustment region 42111. The drive source 41 keeps moving in the normal rotation in the direction indicated by the arrow F1 in fig. 2.

(1) The driving source 41 drives the first cam 421 to rotate forward, the pressure regulating crank 431 enters the first idling area 42112 from the pressure regulating area 42111, and the pressure value of the presser foot pressure regulating mechanism 30 is gradually reduced to the minimum value; meanwhile, the presser foot plate state of the presser foot lifting mechanism 20 can be adjusted, and then the material taking or adding work can be performed.

(2) When the sewing machine 100 needs to sew the cloth again, the presser foot lifting mechanism 20 can be adjusted to a pressing state; the drive source 41 is reversed to the pressure regulating region 42111. When sewing the joining region of different cloth, the pressure of the presser foot plate 23 needs to be adjusted to adapt to the sewing of cloth with different thicknesses. The output end of the driving source 41 drives the first cam 421 to rotate forward or backward to change the pressure value of the presser foot pressure adjusting mechanism 30.

The adjustment process can meet the adjustment requirement of the pressure value of the presser foot pressure adjusting mechanism 30 of the sewing machine 100 under different conditions, so that the sewing machine 100 can be suitable for sewing of different fabrics or different regions.

Example two

Referring to fig. 6 to 8, fig. 6 is a schematic structural view of a pressure regulating mechanism 40 and other mechanisms of the sewing machine 100 according to another embodiment of the present invention; FIG. 7 is a schematic view of the driving element 42a of the sewing machine 100 shown in FIG. 6; fig. 8 is a schematic view of a rotation region of the driving source 41 corresponding to a functional region of the driving element 42a shown in fig. 7.

The difference from the above-described embodiment is the arrangement of the driving element 42a, and the first driving assembly 43a is correspondingly adjusted to fit the driving element 42 a.

In the present embodiment, the driving element 42a includes a cam-shaped first cam 421 a. Unlike the first cam 421, the curvature of the first region 4211 is provided, and the function achieved by the same is substantially the same. The first cams 421a are fixedly sleeved at the output end of the driving source 41; the outer profile of the first cam 421a forms a first region 4211.

In one embodiment, the first drive assembly 43a includes a pressure adjustment crank 431a and a first drive shaft 432 a. One end of the pressure regulating crank 431a abuts against the first cam 421a, and the other end is fixedly connected to one end of the first driving shaft 432 a; the first driving shaft 432a is connected to the pressure adjusting lever 433a at a position relatively distant from the pressure adjusting crank 431 a.

In the present embodiment, the pressure adjustment crank 431a has substantially the same structure as the pressure adjustment crank 431 in the first embodiment. In contrast, the pressure regulating crank 431a is provided with a pressure regulating roller 4311a at an end thereof relatively distant from the first driving shaft 432 a. The pressure regulating roller 4311a is rotatably connected to one end of the pressure regulating crank 431a via a rotating shaft, and the outer circumference of the pressure regulating roller 4311a abuts against the first cam 421 a. The pressure regulating crank 431a abuts against the first cam 421a via the pressure regulating roller 4311 a. The pressure regulating roller 4311a can maintain contact with the outer contour of the first cam 421a, so that a cam mechanism is formed between the first cam 421a and the pressure regulating crank 431a and the pressure regulating roller 4311 a. In this cam mechanism, the first cam 421a is a driving member, the pressure-adjusting crank 431a is a driven member, and the contact therebetween is achieved by the pressure-adjusting roller 4311 a. With this arrangement, friction and wear between the pressure adjustment crank 431a and the first cam 421a can be reduced. It is understood that in other embodiments, the presser foot roller 4311a may be omitted accordingly if friction loss is not considered.

In one embodiment, the first driving assembly 43a further includes a pressure regulating lever 433 a. The first drive shaft 432a has substantially the same structure as the first drive shaft 432 in the first embodiment; the curved shape of the pressure regulating lever 433a is different from the structure of the pressure regulating lever 433 in the first embodiment, but the function is substantially the same.

The difference is that: the first driving shaft 432a is connected to the pressure adjusting lever 433 a. The first driving shaft 432a is provided with a swing link 4321a at an end thereof remote from the pressure regulating crank 431 a. The swing rod part 4321a is connected with the pressure regulating lever 433 a. A first chute 4331a is formed at one end of the pressure regulating lever 433a relatively far away from the presser foot pressure regulating mechanism 30; the swing rod 4321a has a connection protrusion (not shown) at an end thereof. The connection protrusion is slidably mounted in the first sliding groove 4331 a. When the first driving shaft 432a rotates, the swing link 4321a swings along the axis of the first driving shaft 432a, and drives one end of the pressure regulating crank 431a to rotate around the hinge point; the rotation of the pressure adjusting lever 433a drives the position of the adjusting lever 31 to be changed, thereby changing the compression amount of the pressure adjusting elastic member 32.

In the present embodiment, one end of the pressure adjusting lever 433a relatively distant from the swinging rod 4321a is slidably connected to the presser foot pressure adjusting mechanism 30. Specifically, one end of the pressure regulating lever 433a relatively far away from the swing link 4321a is provided with a first sliding slot 4332a along a first direction. The end of the adjusting lever 31 is correspondingly provided with a connecting shaft 313. The connecting shaft 313 is inserted into the first sliding slot 4332 a. The engagement between the connecting shaft 313 and the first sliding groove 4332a corresponds to the engagement between the driving slider 435 and the guiding groove 3121 in the first embodiment. The force of the pressure adjusting lever 433a on the adjusting lever 31 in the first direction is released through the sliding process between the connecting shaft 313 and the first slide groove 4332a, so that the pressure adjusting lever 433a applies the force on the adjusting lever 31 only in the first direction.

The first region 4211 includes a pressure adjustment region 42111 and a first blank region 42112. Specifically, in the initial state, the pressure regulating roller 4311a abuts against the first idle zone 42112, and when the pressure regulating roller 4311a moves along the first idle zone 42112, the position of the pressure regulating crank 431a is not changed, and the pressure foot pressure regulating mechanism 30 maintains the minimum pressure value. The output end of the driving source 41 rotates in a forward or reverse direction, the pressure regulating roller 4311a moves to the pressure regulating region 42111 due to the rotation of the first cam 421a, and the pressure regulating crank 431a can drive the swing link 4321a of the first driving shaft 432a to swing and drive the presser foot pressure adjusting mechanism 30 to change the pressure value.

As shown in fig. 8 and 9, the functional region formed by the first cam 421a includes the pressure adjusting region 42111 and the first idling region 42112. The pressure regulating region 42111 and the first idling region 42112 correspond to different rotation angles of the output end of the driving source 41, respectively.

In this embodiment, the process of the first cam 421a cooperatively driving the first driving assembly 43a is substantially the same as that of the first embodiment, and is not repeated herein.

EXAMPLE III

Referring to fig. 9 and 11, fig. 9 is a schematic structural view of a pressure regulating mechanism 40 and other mechanisms of the sewing machine 100 according to another embodiment of the present invention; FIG. 10 is a schematic view of the driving element 42b of the sewing machine 100 shown in FIG. 9; fig. 11 is a schematic view of a rotation region of the driving source 41 corresponding to a functional region of the driving element 42b shown in fig. 10.

In the present embodiment, the driving element 42b is an integrally provided cam member to which the output end of the driving source 41 is connected. In contrast to the two embodiments described above: the pressure adjustment zone 42111 and the first lost motion zone 42112 in the first zone 4211 differ in area and curvature on the cam member.

The outer periphery of the cam member forms, in order in the clockwise direction, a pressure regulating region 42111 and a first idle region 42112. The first idling area 42112 is equidistant from the rotation point 422 of the cam member, i.e., the first idling area 42112 is a circular arc segment centered on the rotation point 422 of the cam member. The distance between the pressure regulating region 42111 and the cam member's pivot point 422 increases gradually in a direction away from the first lost motion region 42112.

The first driving assembly 43b includes a pressure adjusting crank 431b and a first driving shaft 432 b. The pressure adjustment crank 431b functions substantially the same as in the second embodiment, and is relatively long in size to accommodate different installation spaces. And the pressure regulating crank 431b is fixedly connected with the first driving shaft 432b through a threaded fastener, so that one end of the pressure regulating crank 431b is circumferentially linked with the first driving shaft 432 b. It is understood that, in other embodiments, one end of the pressure adjusting crank 431b may be fixedly connected to the first driving shaft 432b by being integrally disposed or riveted.

In one embodiment, the first drive assembly 43b further includes an abutment assembly 433 b. The abutment member 433b is mounted between the pressure regulating crank 431b and the cam member, and abuts against an end of the pressure regulating crank 431b relatively distant from the first driving shaft 432b and the first region 4211 of the cam member, respectively. The abutment assembly 433b serves to transmit the power output of the cam member and enable the pressure regulating crank 431b to respond to the power output in time. Because of the relatively close distance between the respective abutment regions of the cam members, the abutment assembly 433b is positioned such that the pressure regulating crank 431b extends to a position where the pressure regulating crank 431b is conveniently mounted, corresponding to the abutment region of the first region 4211.

The abutment member 433b includes an abutment plate 4331b having a substantially triangular shape and pressure regulating rollers 4332b located at two corners of the abutment plate 4331 b. The other corner of the triangular abutment plate 4331b is rotatably attached to the housing 10 of the sewing machine 100. One of the pressure regulating rollers 4332b abuts on the first region 4211 of the cam member, and the other abuts on the pressure regulating crank 431 b. It is understood that in other embodiments, the abutment member 433b may be provided in other shapes, and is not specifically limited thereto.

In one embodiment, the first driving assembly 43b further comprises a pressure adjusting lever 434 b. The structure of the pressure adjusting lever 434b is substantially the same as that of the second embodiment, except that: the pressure adjusting lever 434b is connected to the first driving shaft 432 b. Specifically, an end of the first driving shaft 432b relatively distant from the pressure adjusting crank 431b is fixedly connected to an end of the pressure adjusting lever 434b, so that the pressure adjusting lever 434b can be circumferentially interlocked with the first driving shaft 432 b.

In one embodiment, the pressure adjustment lever 434b is secured to the first drive shaft 432b by a fastener (not numbered). So set up for pressure regulating lever 434b can be along with the rotation of first drive axle 432b and swing around the pin joint, and the connected mode is simple and firm.

The pressure adjusting region 42111 and the first idling region 42112 formed by the cam member correspond to the pressure adjusting region 42111 and the first idling region 42112, respectively, when the drive source 41 rotates. When the driving source 41 corresponds to the first blank area 42112, the presser foot pressure adjusting mechanism 30 corresponds to a minimum pressure value, and at this time, the driving force required for changing the state of the presser foot lifting mechanism 20 is minimum. When the sewing machine 100 is operated under no load, the pressure value of the presser foot pressure adjusting mechanism 30 is the minimum value, the presser foot lifting mechanism 20 is an idle stroke, and excessive abrasion of parts such as the feed dog, the presser foot plate 23 and the like can be effectively prevented.

When the output end of the driving source 41 rotates, the outer peripheral surface of the pressure regulating roller 4332b is in contact engagement along the pressure regulating region 42111 of the cam member. When the pressure adjusting area 42111 acts on the outer circumferential surface of the pressure adjusting roller 4332b, the pressure adjusting crank 431b can swing, and further the pressure adjusting lever 434b drives the pressure foot pressure adjusting mechanism 30 to move, so that the compression amount of the pressure adjusting elastic member 32 changes, and the pressure value of the pressure foot pressure adjusting mechanism 30 is changed.

In the three embodiments described above, the specific embodiments of the driving element 42(42a, 42b) and the first driving assembly 43(43a, 43b) are not fixed, various embodiments can be replaced with each other, and a single element structure can be applied to other embodiments as long as the driving element 42(42a, 42b) can adjust the pressure value of the presser foot pressure adjusting mechanism 30 through the first driving assembly 43(43a, 43 b).

An embodiment of the utility model provides a pressure regulating mechanism. The pressure regulating mechanism is arranged, so that the sewing machine with the pressure regulating mechanism can accurately and conveniently regulate the pressure adjusting mechanism.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A pressure regulating mechanism for regulating a pressure value of a presser foot pressure regulating mechanism in a sewing machine, the pressure regulating mechanism comprising a drive source, a drive element and a first drive assembly, the first drive assembly being connected to the presser foot pressure regulating mechanism, wherein:

the driving element is connected to an output end of the driving source and can rotate along with the driving source;

the drive element includes a first region that acts on the first drive assembly and adjusts a pressure value of the presser foot pressure adjustment mechanism.

2. The pressure regulating mechanism according to claim 1, wherein the first region includes a pressure regulating region, the pressure foot pressure adjusting mechanism being capable of changing a pressure value by the first drive assembly under rotation of the drive element when the pressure regulating region acts on the first drive assembly.

3. The pressure regulating mechanism of claim 2, wherein said first region further comprises a first open area, said first open area interfacing with said pressure regulating area; when the first idle running region acts on the first driving component, the pressure foot pressure adjusting mechanism can maintain a minimum pressure value through the first driving component under the rotation of the driving element.

4. The pressure regulating mechanism according to claim 3, wherein a distance between said pressure regulating region and a rotation point of said driving member is gradually increased in a direction away from said first idling region.

5. The pressure regulating mechanism according to claim 1, wherein the driving element includes a first cam connected to an output end of the driving source; the first region is formed on the first cam.

6. The pressure regulating mechanism according to claim 1, wherein the first driving assembly comprises a pressure regulating crank and a first driving shaft, one end of the pressure regulating crank is abutted against the first region, and the other end of the pressure regulating crank is in circumferential linkage with one end of the first driving shaft; the first driving shaft is rotatably connected to a shell of the sewing machine, and the other end of the first driving shaft is hinged to the presser foot pressure adjusting mechanism;

the pressure regulating crank can swing around the axis of the first driving shaft along with the first area under the rotation of the driving element, and the pressure value of the presser foot pressure regulating mechanism is regulated through the first driving shaft.

7. The pressure regulating mechanism according to claim 6, wherein the first driving assembly further comprises a pressure regulating connecting rod, a pressure regulating lever and a driving slider, and two ends of the pressure regulating connecting rod are hinged to the first driving shaft and the pressure regulating lever;

the middle of the pressure regulating lever is hinged to the sewing machine shell, one end of the pressure regulating lever is hinged to the position, relatively far away from the pressure regulating crank, of the first driving shaft, and the other end of the pressure regulating lever is hinged to the driving slide block;

the driving sliding block is connected with the presser foot pressure adjusting mechanism in a sliding mode and can slide relative to the presser foot pressure adjusting mechanism along a first direction;

the first driving shaft drives the pressure regulating lever to rotate around a hinge point through the pressure regulating connecting rod, and the pressure value of the presser foot pressure regulating mechanism is regulated along a first direction.

8. The pressure regulating mechanism according to claim 6, wherein a swing rod part is arranged at one end of the first driving shaft, which is relatively far away from the pressure regulating crank, the first driving assembly further comprises a pressure regulating lever, the middle part of the pressure regulating lever is hinged to the sewing machine shell, and two ends of the pressure regulating lever are respectively connected to the swing rod part and the pressure regulating mechanism in a sliding manner;

the first driving shaft rotates and drives the pressure regulating lever to rotate around a hinge point through the swing rod part so as to regulate the pressure value of the pressure foot pressure regulating mechanism.

9. The pressure regulating mechanism according to claim 6, wherein the first driving assembly further comprises a pressure regulating lever, the middle of the pressure regulating lever is hinged to the sewing machine shell, one end of the pressure regulating lever is fixedly connected to one end of the first driving shaft, which is relatively far away from the pressure regulating crank, and the other end of the pressure regulating lever is connected to the pressure foot pressure regulating mechanism in a sliding manner;

the first driving shaft rotates, and the pressure regulating lever is driven to rotate around a hinge point through the first driving shaft so as to regulate the pressure value of the presser foot pressure regulating mechanism.

10. A sewing machine characterized by comprising a presser foot pressure adjusting mechanism and a pressure regulating mechanism as claimed in any one of claims 1 to 9.

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