Feeding mechanism of sewing machine

Abstract

The utility model provides a feeding mechanism of a sewing machine, and belongs to the technical field of sewing machines. The problem that an existing sewing machine is insufficient in universality is solved. The feeding mechanism of the sewing machine comprises a feed dog, a feeding shaft and a feed lifting shaft which can swing in a reciprocating mode are arranged at the bottom of a machine base, the feeding mechanism further comprises a feeding connecting rod and a vertically-arranged feed dog frame connecting rod, and a feeding boss located above the feeding connecting rod is arranged on the machine base in a protruding mode. A strip-shaped sliding groove formed in the length direction of the feed dog frame connecting rod is formed in the feed dog frame connecting rod, the feed dog frame connecting rod is connected with the machine base through a connecting piece arranged in the strip-shaped sliding groove in a penetrating mode, the feed dog is located in the feed boss and fixedly connected to the upper end of the feed dog frame connecting rod, and the middle of the feed connecting rod is hinged to the lower end of the feed dog frame connecting rod. The feeding shaft is connected with one end of the feeding connecting rod and can drive the feeding connecting rod to move front and back in the feeding direction, and the feed lifting tooth shaft is connected with the other end of the feeding connecting rod and can drive the feeding connecting rod to move up and down. The sewing machine has the advantage of being high in universality.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines and relates to a feeding mechanism of a sewing machine. Background Art

[0002] There are various types of sewing machines. Among them, the shell type machine is a special type of sewing machine. During the sewing process, this sewing machine will produce a unique appearance effect, similar to the spiral shape of a shell, adding a decorative effect to the sewn clothing or fabric. Therefore, it is also called a shell type trimming overlock sewing machine.

[0003] The feeding mechanism of a sewing machine is one of the core mechanisms of the sewing machine. It is the mechanism that delivers the fabric during sewing. The quality of the design of the feeding mechanism directly affects the sewing quality and efficiency of the sewing machine. For example, a feeding mechanism of an overlock sewing machine disclosed in a Chinese patent document (Application No.: 202020256143.X) includes a machine shell, a needle plate, a differential feeding crank, a main feeding crank, and a crankshaft disposed in the machine shell. A main feed dog frame and a differential feed dog frame are provided in the machine shell. A feeding assembly capable of driving the main feed dog frame and the differential feed dog frame to move back and forth is provided on the machine shell. The feeding assembly includes an eccentric cam, a feed shaft, and a feed link. When the crankshaft rotates, it drives the feed shaft to swing, so as to respectively drive the differential feed dog and the main feed dog to move back and forth through the differential feeding crank and the main feeding crank. At the same time, the rotation of the crankshaft drives the lift cam to rotate, and the lift cam can drive the dog frame to drive the feed dog to move up and down in the needle plate.

[0004] In this feeding mechanism, the main feed dog frame, the differential feed dog frame, and the feeding assembly that drives the main feed dog frame and the differential feed dog frame to move back and forth are all disposed at the rear side of the feed dog and are basically at the same height as the feed dog. Although this structure can reasonably utilize the space at the rear side of the feed dog, since the main feed dog frame, the differential feed dog frame, and the feeding assembly are all arranged at the feeding platform part of the machine shell, the size of the feeding platform part is relatively large. Therefore, the sewing machine cannot sew small-sized tubular fabrics such as collars or hats, resulting in the disadvantage of insufficient versatility of existing sewing machines. Summary of the Invention

[0005] The purpose of the present utility model is to propose a feeding mechanism of a sewing machine in view of the above problems existing in the prior art. The present utility model solves the problem that it is difficult for existing sewing machines to sew small-sized tubular fabrics, resulting in insufficient versatility of the sewing machine.

[0006] The object of the utility model can be achieved through the following technical solutions: a feeding mechanism of a sewing machine, the sewing machine includes a machine base, the feeding mechanism includes a feed dog, the bottom of the machine base is provided with a feed shaft and a tooth lifting shaft that can both swing back and forth, and it is characterized in that the feeding mechanism also includes a feeding connecting rod and a vertically arranged tooth frame connecting rod, the machine base is protrudingly provided with a feeding boss located above the feeding connecting rod, the tooth frame connecting rod is provided with a strip slide groove arranged along its length direction, the tooth frame connecting rod is connected to the machine base through a connecting piece penetrated in the strip slide groove, the feed dog is located in the feeding boss and is fixedly connected to the upper end of the tooth frame connecting rod, the middle part of the feed connecting rod is hinged with the lower end of the tooth frame connecting rod, the feed shaft is connected to one end of the feed connecting rod and can drive the feed connecting rod to move forward and backward along the feeding direction, and the tooth lifting shaft is connected to the other end of the feed connecting rod and can drive the feed connecting rod to move up and down.

[0007] When the feed shaft swings back and forth, it drives the feed connecting rod to move forward and backward along the feeding direction. When the lifting shaft swings back and forth, it drives the feed connecting rod to move up and down. At this time, since the tooth frame connecting rod is connected to the machine base through a connecting piece that slides through the strip slide groove, and the middle part of the feed connecting rod is hinged to the lower end of the tooth frame connecting rod, when the feed connecting rod moves up and down, the tooth frame connecting rod can move up and down accordingly. When the feed connecting rod moves back and forth, the upper end of the tooth frame connecting rod will swing back and forth, thereby causing the feed dog fixedly connected to the upper end of the tooth frame connecting rod to move up and down and back and forth, thereby delivering the cloth forward.

[0008] In the feeding mechanism, a vertically arranged tooth frame connecting rod is installed on the machine base, and the feeding connecting rod is hinged at the lower end of the tooth frame connecting rod, so that the reciprocating swing of the feeding shaft and the tooth lifting shaft can be converted into the up and down movement and the forward and backward swing of the tooth frame connecting rod, thereby driving the feeding teeth to deliver the cloth. In this structure, the vertically arranged tooth frame connecting rod allows the position of the feeding connecting rod to be lowered, so that the feeding connecting rod is located outside the feeding boss to realize power transmission, and the feeding connecting rod and the middle and lower parts of the tooth frame connecting rod will not occupy the space inside the feeding boss, so that the miniaturization design of the feeding boss and the size of the feeding boss can be reduced, so that small-sized tubular cloth can be sleeved on the feeding boss for sewing, so this sewing machine can be suitable for sewing large and small tubular cloths of different sizes, and has the advantage of strong versatility.

[0009] In the feed mechanism of the sewing machine, the feed boss has a receiving cavity, the side of the feed boss has a clearance notch connected to the receiving cavity, and the upper end of the tooth frame connecting rod is located in the clearance notch. The setting of the clearance notch allows the upper end of the tooth frame connecting rod to extend into the clearance notch, so that the height of the upper end of the tooth frame connecting rod is higher and closer to the feed dog, so that it is convenient for the tooth frame connecting rod to connect with the feed dog in the feed boss. At the same time, this structure does not increase the size of the feed boss, which is conducive to the miniaturization design of the feed boss.

[0010] In the above-mentioned feeding mechanism of the sewing machine, the machine base includes a base body and a mounting plate, the mounting plate is connected to the outer wall of the base body by bolts, and the connecting piece and the feeding boss are fixedly connected to the mounting plate. In this design, the mounting plate plays the role of supporting the feeding boss and installing the toothed rack connecting rod, achieving two uses in one, simplifying the structure of the sewing machine and reducing the manufacturing cost. The mounting plate supports the feeding boss and can improve the stability of the feeding boss. The mounting plate adopts a detachable installation method, and the actual manufacturing process can make the feeding boss only fixedly connected to the mounting plate. In this way, when the feeding boss needs to be disassembled, it is only necessary to loosen the bolts and remove the mounting plate and the feeding boss together, which makes the assembly and maintenance of the sewing machine more convenient.

[0011] In the feed mechanism of the above-mentioned sewing machine, the top of the feed boss has an installation opening connected to the accommodating cavity, and the feed dog includes a feed portion located at the installation opening and having teeth on the top surface, and a connecting portion extending from the feed portion to the direction of the clearance notch, and the connecting portion is fixedly connected to the upper end of the tooth frame connecting rod. The upper end of the tooth frame connecting rod is located in the clearance notch on the side of the feed boss, and the feed dog is fixedly connected to the upper end of the tooth frame connecting rod through its connecting portion, so that the feed portion of the feed dog is located in the middle of the front-to-back direction of the feed boss, so that the cloth can be stably delivered, and the working stability of the feeding mechanism is improved.

[0012] In the feeding mechanism of the above-mentioned sewing machine, the feeding boss includes two side plates arranged opposite to each other along the feeding direction, a bottom plate is connected between the bottom edges of the two side plates, an outer end plate is connected between the sides of the two side plates away from the seat body, and the bottom plate is welded and fixedly connected to the mounting plate. The outer end plate, the bottom plate and the two side plates are connected to each other to form a relatively stable feeding boss structure, so that the feeding boss can stably support the cloth for feeding. The bottom plate and the mounting plate are welded and fixedly connected, which not only makes the connection between the two convenient, but also improves the connection stability between the two.

[0013] In the feed mechanism of the sewing machine, the clearance notch is located on the side plate close to the tooth frame connecting rod and passes through the bottom edge of the side plate. The clearance notch is located on one of the side plates, so that the clearance notch is located on the side of the feed boss, and the clearance notch passes through the lower edge of the side plate, so that after the tooth frame connecting rod and the feed dog are connected and fixed, the feed dog can be easily placed in the feed boss, thus ensuring that the assembly process of the tooth frame connecting rod and the feed dog is more convenient and quick.

[0014] In the feeding mechanism of the sewing machine described above, the connecting member is a screw. The rod portion of the screw passes through the strip-shaped chute and is threadedly connected to the mounting plate. The head of the screw is located outside the strip-shaped chute on the bracket link. The width of the strip-shaped chute is slightly larger than the diameter of the rod portion of the screw, and the outer diameter of the head of the screw is larger than the width of the strip-shaped chute. The outer diameter of the head of the screw is larger than the width of the strip-shaped chute, and the head of the screw is located outside the strip-shaped chute, so that the bracket link is limited in the axial direction of the screw, realizing the installation of the bracket link on the mounting plate. The width of the strip-shaped chute is slightly larger than the diameter of the rod portion of the screw, so that the bracket link can move up and down and swing back and forth smoothly, and then stably drive the feed dog to deliver the fabric.

[0015] In the feeding mechanism of the sewing machine described above, the feed shaft and the lifter shaft are parallel to each other. One end of the feed shaft is connected with a feed crank. The feed crank includes a sleeve portion fixedly sleeved on the feed shaft and an eccentric portion located on the outer wall of the top of the sleeve portion. One end of the feed link is hinged to the eccentric portion. When the feed shaft swings back and forth, it drives the eccentric portion on the feed crank to swing back and forth, thereby driving the feed link to move back and forth, and finally realizing the back-and-forth movement of the feed dog.

[0016] In the feeding mechanism of the sewing machine described above, one end of the lifter shaft is connected with a lifter fork. The lifter fork includes a sleeve portion fixedly sleeved on the lifter shaft. There are two parallel fork arms on the outer wall of the sleeve portion. A lifter chute is formed between the two fork arms. The other end of the feed link is connected with a connecting slider slidably connected in the lifter chute. When the lifter shaft swings back and forth, the two fork arms of the lifter fork swing up and down synchronously, driving the connecting slider and the feed link to move up and down. At the same time, the connecting slider can reciprocate along the lifter chute. Therefore, while the feed link moves up and down, it can also move back and forth reciprocally, and finally realize the up-and-down and back-and-forth movement of the feed dog, so that the feed dog delivers the fabric.

[0017] In the feeding mechanism of the sewing machine described above, a needle plate that covers the mounting opening is provided on the top surface of the feed boss.

[0018] In the feeding mechanism of the above sewing machine, a main shaft is provided at the top of the machine base, and a horizontally rotating drive shaft parallel to the feeding shaft is provided at the bottom of the machine base. A vertical drive shaft and a hook shaft parallel to the horizontal drive shaft and located above the horizontal drive shaft are also provided on the machine base. The upper and lower ends of the vertical drive shaft are respectively connected to the main shaft and the horizontal drive shaft through bevel gear transmission structures. Pulley wheels are respectively fixedly provided on the horizontal drive shaft and the hook shaft, and the pulley wheels on the horizontal drive shaft and the hook shaft are connected through a synchronous belt. When the main shaft rotates, it drives the vertical drive shaft to rotate through the bevel gear transmission structure, and then drives the horizontal drive shaft to rotate. The rotation of the horizontal drive shaft can drive the hook shaft to rotate through the synchronous belt. A hook is connected to the hook shaft, enabling the hook to move reciprocally, thereby using the hook to catch the surface thread and pull it through the fabric to control the sewing stitch. The hook of the shell-shaped machine and the connection structure between the hook and the hook shaft are prior art and will not be described in detail herein. The bevel gear transmission structure has the advantage of a compact structure and can achieve power transmission in a smaller space, thus facilitating the miniaturized design of the sewing machine.

[0019] Compared with the prior art, the feeding mechanism of this sewing machine has the following advantages: In this feeding mechanism, the vertically arranged bracket connecting rod lowers the position of the feeding connecting rod, enabling power transmission outside the feeding boss. The middle and lower parts of the feeding connecting rod and the bracket connecting rod do not occupy the space inside the feeding boss. This can facilitate the miniaturized design of the feeding boss and reduce its size, allowing small-sized tubular fabrics to be sleeved on the feeding boss for sewing. Therefore, this sewing machine is applicable to sewing tubular fabrics of different sizes, large and small, and has the advantage of strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional structural diagram of the feeding mechanism of this sewing machine.

[0021] Figure 2 is Figure 1 a partial enlarged view of

[0022] Figure 3 is a partial enlarged view of the feeding mechanism of this sewing machine.

[0023] Figure 4 is a transmission structure diagram of the feeding mechanism of this sewing machine.

[0024] Figure 5 is a front view of the second embodiment of the feeding mechanism of this sewing machine.

[0025] Figure 6 is a transmission structure diagram of the second embodiment of the feeding mechanism of this sewing machine.

[0026] In the figure, 1 is the machine base; 1a is the base body; 1b is the mounting plate; 2 is the feed dog; 21 is the feeding part; 22 is the connecting part; 3 is the feed shaft; 4 is the lifter shaft; 5 is the feed link; 6 is the lifter link; 61 is the strip-shaped chute; 7 is the feed boss; 71 is the accommodating cavity; 72 is the side plate; 721 is the relief notch; 73 is the mounting opening; 74 is the outer end plate; 75 is the bottom plate; 8 is the connecting piece; 9 is the feed crank; 91 is the bushing part; 92 is the eccentric part; 10 is the lifter fork; 101 is the sleeve part; 102 is the fork arm; 103 is the lifter chute; 11 is the connecting slider; 12 is the needle plate; 13 is the main shaft; 14 is the first connecting rod; 15 is the second connecting rod; 16 is the eccentric drive wheel; 17 is the drive crank; 18 is the lifter crank; 19 is the bolt; 23 is the horizontal drive shaft; 24 is the hook needle shaft; 25 is the vertical drive shaft; 26 is the bevel gear drive structure; 27 is the pulley; 28 is the synchronous belt. Detailed implementation mode

[0027] The following are specific embodiments of the present invention and in combination with the accompanying drawings, the technical solutions of the present invention will be further described, but the present invention is not limited to these embodiments.

[0028] Embodiment 1

[0029] As Figure 1 and Figure 2 shown, a feeding mechanism of a sewing machine, the sewing machine includes a machine base 1, this feeding mechanism includes a feed dog 2, a reciprocating swingable feed shaft 3 and a lifter shaft 4 are arranged at the bottom of the machine base 1, this feeding mechanism also includes a feed link 5 and a vertically arranged lifter link 6, a feed boss 7 protruding from the machine base 1 is located above the feed link 5, a strip-shaped chute 61 is provided on the lifter link 6 along its length direction, the lifter link 6 is connected to the machine base 1 through a connecting piece 8 slidably inserted into the strip-shaped chute 61, the feed dog 2 is located in the feed boss 7 and fixedly connected to the upper end of the lifter link 6, the middle of the feed link 5 is hinged to the lower end of the lifter link 6, one end of the feed shaft 3 is connected to the feed link 5 and can drive the feed link 5 to move back and forth along the feeding direction, and the other end of the lifter shaft 4 is connected to the feed link 5 and can drive the feed link 5 to move up and down.

[0030] As Figure 1 , Figure 2 and Figure 3As shown, the feeding boss 7 has a receiving cavity 71, and the feeding boss 7 includes two side plates 72 arranged opposite to each other along the feeding direction, a bottom plate 75 is connected between the bottom edges of the two side plates 72, an outer end plate 74 is connected between the sides of the two side plates 72 away from the seat body 1a, and the bottom plate 75 is welded and fixedly connected to the mounting plate 1b. The clearance notch 721 is located on the side plate 72 close to the tooth frame connecting rod 6 and passes through the bottom edge of the side plate 72, and the upper end of the tooth frame connecting rod 6 is located in the clearance notch 721. The top of the feeding boss 7 has an installation opening 73 connected to the receiving cavity 71, and a needle plate 12 is provided on the top surface of the feeding boss 7 to cover the installation opening 73.

[0031] like Figure 1 and Figure 2 As shown, the machine base 1 includes a base body 1a and a mounting plate 1b, the mounting plate 1b is connected to the outer wall of the base body 1a by bolts 19, and the connecting piece 8 and the feeding boss 7 are fixedly connected to the mounting plate 1b. The connecting piece 8 is a screw, the rod of the screw passes through the strip groove 61 and is threadedly connected to the mounting plate 1b, the head of the screw is located outside the strip groove 61 on the tooth frame connecting rod 6, the width of the strip groove 61 is slightly larger than the diameter of the screw rod, and the outer diameter of the screw head is larger than the width of the strip groove 61. Figure 4 As shown, the feed dog 2 includes a feed portion 21 located at the mounting opening 73 and having teeth on the top surface, and a connecting portion 22 extending from the feed portion 21 toward the clearance notch 721 , and the connecting portion 22 is fixedly connected to the upper end of the tooth frame connecting rod 6 .

[0032] like Figure 4 As shown, one end of the feed shaft 3 is connected to a feed crank 9, which includes a sleeve portion 91 fixedly sleeved on the feed shaft 3, an eccentric portion 92 located on the outer wall of the top of the sleeve portion 91, and one end of the feed connecting rod 5 is hinged to the eccentric portion 92. One end of the tooth lifting shaft 4 is connected to a tooth lifting fork 10, which includes a sleeve portion 101 fixedly sleeved on the tooth lifting shaft 4, and two parallel fork arms 102 on the outer wall of the sleeve portion 101, and a tooth lifting groove 103 is formed between the two fork arms 102, and the other end of the feed connecting rod 5 is connected to a connecting slider 11 slidably connected to the tooth lifting groove 103.

[0033] Furthermore, the sewing machine further comprises a main shaft 13, a connecting rod 14 and a connecting rod 2 15, and the driving motor is connected to the main shaft 13 and can drive the main shaft 13 to rotate. The upper ends of the connecting rod 14 and the connecting rod 2 15 are connected to the main shaft 13 through an eccentric transmission wheel 16, the lower end of the connecting rod 14 is connected to the other end of the feed shaft 3 through a transmission crank 17, and the lower end of the connecting rod 2 15 is connected to the other end of the tooth lifting shaft 4 through a tooth lifting crank 18.

[0034] When the sewing machine is working, the motor drives the main shaft 13 to rotate, and when the main shaft 13 rotates, the feed shaft 3 and the tooth lifting shaft 4 are driven to swing back and forth through the connecting rod 14 and the connecting rod 2 15. Among them, when the feed shaft 3 swings back and forth, the eccentric part 92 on the feed crank 9 is driven to swing back and forth, thereby driving the feed connecting rod 5 to move back and forth. When the tooth lifting shaft 4 swings back and forth, the two fork arms 102 of the tooth lifting fork 10 swing up and down synchronously, driving the connecting slider 11 and the feed connecting rod 5 to move up and down. At the same time, the connecting slider 11 can move back and forth along the tooth lifting slide groove 103, so that the feed connecting rod 5 can move back and forth while moving up and down.

[0035] Since the tooth frame connecting rod 6 is connected to the machine base 1 through the connecting piece 8 slidingly inserted in the strip slide groove 61, and the middle part of the feeding connecting rod 5 is hinged to the lower end of the tooth frame connecting rod 6, when the feeding connecting rod 5 moves up and down, the tooth frame connecting rod 6 can move up and down accordingly, and when the feeding connecting rod 5 moves forward and backward, the upper end of the tooth frame connecting rod 6 will swing back and forth, thereby causing the feed dog 2 fixedly connected to the upper end of the tooth frame connecting rod 6 to move up and down and forward and backward, thereby delivering the cloth forward.

[0036] Embodiment 2

[0037] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that a horizontal transmission shaft 23 which can rotate circumferentially and is parallel to the feed shaft 3 is provided at the bottom of the machine base 1, and a vertical transmission shaft 25 and a hook shaft 24 which is located on the upper side of the horizontal transmission shaft 23 and is parallel to the horizontal transmission shaft 23 are also provided on the machine base 1, the upper and lower ends of the vertical transmission shaft 25 are respectively connected to the main shaft 13 and the horizontal transmission shaft 23 through a bevel gear transmission structure 26, and pulleys 27 are fixedly provided on the horizontal transmission shaft 23 and the hook shaft 24, and the pulleys 27 on the horizontal transmission shaft 23 and the hook shaft 24 are connected through a synchronous belt 28.

[0038] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0039] Although terms such as 1, machine base; 1a, base body; 1b, mounting plate; 2, feed dog; 21, feeding part; 22, connecting part; 3, feed shaft; 4, lifter shaft; 5, feed connecting rod; 6, dog frame connecting rod; 61, strip-shaped chute; 7, feed boss; 71, accommodating cavity; 72, side plate; 721, relief notch; 73, mounting opening; 74, outer end plate; 75, bottom plate; 8, connecting piece; 9, feed crank; 91, bushing part; 92, eccentric part; 10, lifter fork; 101, sleeve part; 102, fork arm; 103, lifter chute; 11, connecting slider; 12, needle plate; 13, main shaft; 14, connecting rod one; 15, connecting rod two; 16, eccentric drive wheel; 17, drive crank; 18, lifter crank; 19, bolt are used more frequently in this text, it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present utility model; interpreting them as any additional limitation is contrary to the spirit of the present utility model.

Claims

1. A feeding mechanism of a sewing machine, the sewing machine comprising a machine base (1), the feeding mechanism comprising a feeding dog (2), a feeding shaft (3) and a tooth lifting shaft (4) both capable of reciprocating swing being arranged at the bottom of the machine base (1), characterized in that: The feeding mechanism also includes a feeding connecting rod (5) and a vertically arranged tooth frame connecting rod (6); a feeding boss (7) located above the feeding connecting rod (5) is protruding from the machine base (1); a strip slide groove (61) is provided on the tooth frame connecting rod (6) along its length direction; the tooth frame connecting rod (6) is connected to the machine base (1) through a connecting piece (8) inserted into the strip slide groove (61); the feeding tooth (2) is located in the feeding boss (7) and is fixedly connected to the upper end of the tooth frame connecting rod (6); the middle part of the feeding connecting rod (5) is hinged to the lower end of the tooth frame connecting rod (6); the feeding shaft (3) is connected to one end of the feeding connecting rod (5) and can drive the feeding connecting rod (5) to move forward and backward along the feeding direction; the tooth lifting shaft (4) is connected to the other end of the feeding connecting rod (5) and can drive the feeding connecting rod (5) to move up and down.

2. The feeding mechanism of the sewing machine according to claim 1, characterized in that: The feeding boss (7) has a receiving cavity (71) therein, and the side of the feeding boss (7) has a clearance notch (721) connected to the receiving cavity (71), and the upper end of the tooth rack connecting rod (6) is located in the clearance notch (721).

3. The feeding mechanism of the sewing machine according to claim 2, characterized in that: The machine base (1) comprises a base body (1a) and a mounting plate (1b); the mounting plate (1b) is connected to the outer wall of the base body (1a) via bolts (19); and the connecting piece (8) and the feeding boss (7) are both fixedly connected to the mounting plate (1b).

4. The feeding mechanism of a sewing machine according to claim 2, characterized in that: The top of the feeding boss (7) has a mounting opening (73) connected to the accommodating cavity (71); the feeding tooth (2) comprises a feeding portion (21) located at the mounting opening (73) and having teeth on the top surface; and a connecting portion (22) extending from the feeding portion (21) toward the clearance notch (721); the connecting portion (22) is fixedly connected to the upper end of the tooth frame connecting rod (6).

5. The feeding mechanism of the sewing machine according to claim 3, characterized in that: The feeding boss (7) comprises two side plates (72) arranged opposite to each other along the feeding direction, a bottom plate (75) is connected between the bottom edges of the two side plates (72), an outer end plate (74) is connected between the sides of the two side plates (72) away from the seat body (1a), and the bottom plate (75) is welded and fixedly connected to the mounting plate (1b).

6. The feeding mechanism of the sewing machine according to claim 5, characterized in that: The clearance notch (721) is located on the side plate (72) close to the tooth frame connecting rod (6) and passes through the bottom edge of the side plate (72).

7. The feeding mechanism of a sewing machine according to claim 3, characterized in that: The connecting member (8) is a screw, the rod of the screw passes through the strip slide groove (61) and is threadedly connected to the mounting plate (1b), the head of the screw is located outside the strip slide groove (61) on the tooth frame connecting rod (6), the width of the strip slide groove (61) is slightly larger than the diameter of the screw rod, and the outer diameter of the head of the screw is larger than the width of the strip slide groove (61).

8. The feeding mechanism of a sewing machine according to any one of claims 1 to 7, characterized in that: The feeding shaft (3) and the tooth lifting shaft (4) are parallel to each other. One end of the feeding shaft (3) is connected to a feeding crank (9). The feeding crank (9) includes a sleeve portion (91) fixedly sleeved on the feeding shaft (3) and an eccentric portion (92) located on the top outer wall of the sleeve portion (91). One end of the feeding connecting rod (5) is hinged to the eccentric portion (92).

9. The feeding mechanism of a sewing machine according to any one of claims 1 to 7, characterized in that: One end of the tooth-lifting shaft (4) is connected to a tooth-lifting fork (10), and the tooth-lifting fork (10) includes a sleeve portion (101) fixedly sleeved on the tooth-lifting shaft (4), and the outer wall of the sleeve portion (101) is provided with two parallel fork arms (102), and a tooth-lifting slide groove (103) is formed between the two fork arms (102), and the other end of the feeding connecting rod (5) is connected to a connecting slider (11) slidably connected to the tooth-lifting slide groove (103).

10. The feeding mechanism of a sewing machine according to any one of claims 1 to 7, characterized in that: The top of the machine base (1) is provided with a main shaft (13), the bottom of the machine base (1) is provided with a horizontal transmission shaft (23) which can rotate in the circumferential direction and is parallel to the feeding shaft (3), the machine base (1) is also provided with a vertical transmission shaft (25) and a hook shaft (24) which is located on the upper side of the horizontal transmission shaft (23) and is parallel to the horizontal transmission shaft (23), the upper end and the lower end of the vertical transmission shaft (25) are respectively connected to the main shaft (13) and the horizontal transmission shaft (23) through a bevel gear transmission structure (26), the horizontal transmission shaft (23) and the hook shaft (24) are respectively fixedly provided with pulleys (27), and the pulleys (27) on the horizontal transmission shaft (23) and the hook shaft (24) are connected through a synchronous belt (28).

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