Feeding mechanism for a jointer

Abstract

This invention provides a feeding mechanism for a sewing machine, belonging to the field of sewing machine technology. It solves the problem of insufficient sewing quality in existing sewing machines when sewing thick materials. The feeding mechanism of this sewing machine includes a presser foot base, an auxiliary feed dog shaped like an "﹂", a push spring disposed within the presser foot base, a lifting dog arm disposed within the machine base, and a main feed dog fixedly connected to the front end of the lifting dog arm. The lower end of the presser foot lifting shaft is connected to a main presser foot, which is vertically opposite to the main feed dog. The presser foot base is located in front of the main presser foot and fixedly connected to it. An auxiliary presser foot is slidably connected to the presser foot base vertically. Under the action of the push spring, the auxiliary presser foot abuts downward against the presser foot base. The rear end of the auxiliary feed dog is fixedly connected to the lifting dog arm, and its front end is bent upward and integrally formed with teeth vertically opposite to the auxiliary presser foot on its top surface. This invention produces neater and more aesthetically pleasing stitches when sewing thick materials, thus improving sewing quality.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology and relates to a feeding mechanism for a stitching machine. Background Technology

[0002] A sewing machine is a specialized sewing machine used to join two pieces of fabric together. Currently, sewing machines, especially the articulated arm four-needle six-thread sewing machine, have become essential models in the knitting and sewing industry. The feeding mechanism is the core component of the sewing machine. It mainly uses the coordinated movement of the presser foot and the feed dog to drive the fabric along a specific trajectory to complete continuous sewing operations. The working stability of the feeding mechanism directly determines the uniformity of the sewing stitches and the smoothness of the fabric.

[0003] In conventional flatbed sewing machines, the feeding mechanism, such as that of a sewing machine disclosed in patent literature (application number: 202422374389.8), includes a feed dog assembly, a main feed dog, a differential linkage, and a differential feed dog. It primarily relies on a single presser foot and main feed dog to achieve the feeding function. This traditional feeding mechanism can generally meet sewing needs when handling conventional thin or medium-thickness fabrics. However, when sewing thicker materials such as multi-layered fabrics, thick knits, or leather, the limited area of ​​contact between the single presser foot and main feed dog results in insufficient feeding force and fluctuations in fabric feed speed. Ultimately, the sewn product is prone to wrinkles, uneven stitch density, and inconsistent stitch length. Therefore, conventional sewing machine feeding mechanisms suffer from insufficient sewing quality when feeding thick materials. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a feeding mechanism for a sewing machine. This invention solves the problem that existing sewing machines are prone to insufficient sewing quality when sewing thick materials.

[0005] The purpose of this utility model can be achieved through the following technical solution: a feeding mechanism for a sewing machine, the sewing machine including a machine base and a presser foot lifting shaft disposed on the machine base, the feeding mechanism including a lifting tooth arm disposed in the machine base and a main feed tooth fixedly connected to the front end of the lifting tooth arm, the lower end of the presser foot lifting shaft being connected to a main presser foot disposed vertically opposite to the main feed tooth, characterized in that the feeding mechanism further includes a presser foot seat, an auxiliary feed tooth in the shape of "﹂", and a push spring disposed in the presser foot seat, the presser foot seat being located in front of the main presser foot and fixedly connected to the main presser foot, the auxiliary presser foot being slidably connected to the presser foot seat vertically, the auxiliary presser foot being pressed downward against the presser foot seat under the action of the push spring, the rear end of the auxiliary feed tooth being fixedly connected to the lifting tooth arm, the front end being bent upward and integrally formed with teeth disposed vertically opposite to the auxiliary presser foot on the top surface.

[0006] In this feeding mechanism, in addition to the main presser foot and main feed dog for feeding, an auxiliary presser foot and auxiliary feed dog are also added to work together to achieve feeding. Specifically, the presser foot base is fixedly connected to the main presser foot, allowing the main presser foot to drive the presser foot base to rise and fall synchronously. At the same time, since the auxiliary presser foot is slidably connected to the presser foot base vertically, and the auxiliary presser foot presses downward against the presser foot base under the action of the push spring, the presser foot base can drive the auxiliary presser foot to move upward together. When the presser foot base moves downward, it can drive the auxiliary presser foot to move downward, applying elastic pressure to the fabric.

[0007] Based on this, the auxiliary feed dog is shaped like an "﹂" and is fixedly connected to the lifting arm, allowing it to move synchronously with the main feed dog. When sewing thick materials, the teeth at the front of the auxiliary feed dog can work with the auxiliary presser foot to elastically clamp the fabric, adapting to the thickness of the material and applying a forward pulling force. This design increases the working area and force when feeding thick materials, and achieves the effect of pulling and feeding the thick material from the front of the main presser foot. Therefore, it can move the thick material more stably, reducing wrinkling and jamming during sewing, resulting in neater and more aesthetically pleasing stitches and improved sewing quality.

[0008] In the feeding mechanism of the aforementioned sewing machine, the presser foot seat is a component with a plate-shaped connecting part integrally formed on the outer peripheral wall of a cylindrical guide sleeve. The auxiliary presser foot includes a vertically arranged presser foot shaft and a presser foot plate hinged to the lower end of the presser foot shaft. The upper end of the presser foot shaft slides through the guide sleeve. The plate-shaped connecting part protrudes rearward relative to the guide sleeve, and the presser foot seat is fixedly connected to the main presser foot through its plate-shaped connecting part. The upper end of the presser foot shaft slides through the guide sleeve, which provides a better guiding effect for the auxiliary presser foot, improving the stability of the auxiliary presser foot's movement during feeding, thereby improving the feeding effect. The presser foot seat, through its plate-shaped connecting part and the main presser foot, not only improves the installation stability of the presser foot seat but also creates a certain gap between the auxiliary presser foot and the main presser foot, thus better pulling and feeding thick materials from the front side of the main presser foot, further improving the feeding effect of the feeding mechanism for thick materials, thereby improving the sewing quality.

[0009] In the feeding mechanism of the aforementioned sewing machine, a strip-shaped guide hole is vertically formed on the outer peripheral wall of the guide sleeve. The auxiliary presser foot also includes a limiting pin vertically connected to the upper end of the presser foot shaft. The limiting pin slides with the guide hole, and under the action of the push spring, the limiting pin abuts against the lower end wall of the guide hole. This structure not only restricts the circumferential rotation of the auxiliary presser foot, but also allows the presser foot seat to move upward synchronously with the auxiliary presser foot because the limiting pin abuts against the lower end wall of the guide hole. When the presser foot seat moves downward with the main presser foot, the push spring is compressed at the moment of contact with the fabric, thus forming a buffer and protecting the fabric. Simultaneously, it can better clamp and feed the fabric according to its thickness.

[0010] In the feeding mechanism of the aforementioned sewing machine, a pressure cap is threaded to the upper end of the guide sleeve, and a push spring is disposed inside the guide sleeve. The upper end of the push spring abuts against the pressure cap, and the lower end abuts against the upper end face of the presser foot shaft. By rotating the pressure cap, the compression of the push spring can be changed, thereby adjusting the pressure applied by the push spring to the secondary presser foot. This allows for adjustment of the pressure of the secondary presser foot on the fabric according to the fabric thickness, preventing damage to the fabric due to excessive pressure or ineffective clamping and feeding of the fabric due to insufficient pressure. This ensures the stability of the feeding process and the sewing quality.

[0011] In the feeding mechanism of the aforementioned sewing machine, the plate-shaped connecting part is L-shaped. Its rearmost sidewall is parallel to and abuts against the front end face of the main presser foot, and is slidably connected to the main presser foot in the left-right direction. An adjusting bolt is provided on this sidewall of the plate-shaped connecting part, and a sliding groove is formed in the left-right direction. A bolt hole is formed on the front end face of the main presser foot. The shank of the adjusting bolt passes through the sliding groove and is threaded into the bolt hole. The parallel abutment between the plate-shaped connecting part and the front end face of the main presser foot improves the installation stability of the presser foot seat when the adjusting bolt is tightened. Simultaneously, this design allows for adjustment of the left-right position of the auxiliary presser foot, ensuring the relative positional accuracy between the auxiliary and main presser feet. This ensures that the auxiliary presser foot is accurately positioned in front of the main presser foot to pull the fabric, allowing thick fabric to be stably fed forward and sewn.

[0012] In the feeding mechanism of the aforementioned sewing machine, the rear end of the auxiliary feed dog is fixedly connected to the front end of the lifting arm. This connection method reduces the length of the auxiliary feed dog, making the overall structure more compact, and also reduces the possibility of interference between the auxiliary feed dog and other components during sewing.

[0013] In the feeding mechanism of the aforementioned sewing machine, the lower end of the main feed dog is plate-shaped and vertically positioned. The front end of the lifting arm and the rear end of the auxiliary presser foot are both plate-shaped and parallel to the lower end of the main feed dog. The lower end of the main feed dog is clamped between the front end of the lifting arm and the rear end of the auxiliary presser foot, and the three are fixedly connected by fastening bolts. This structure not only enhances the connection stability between the main feed dog, the lifting arm, and the auxiliary presser foot, ensuring that the main and auxiliary feed dogs always move synchronously for feeding, thus improving the feeding effect, but also facilitates disassembly and replacement of components when needed through bolted connections, reducing maintenance costs.

[0014] In the feeding mechanism of the aforementioned sewing machine, the machine base includes a main body and a feeding seat fixedly connected to the front end face of the main body. The feeding seat is L-shaped, with one side wall of the feeding seat horizontally positioned and having a clearance groove on this side wall for the teeth of the auxiliary feeding teeth to pass through. Designing the feeding seat as an L-shaped plate with one side wall horizontally positioned and having a clearance groove on this side wall allows the side wall to jointly support and feed the fabric, improving the feeding effect.

[0015] In the feeding mechanism of the aforementioned sewing machine, the other side wall of the feed seat is parallel to the front end face of the main body, and a support shaft is vertically connected between this side wall and the front end face of the main body. The rear end of the support shaft is fixedly connected to the main body, and the front end face of the support shaft abuts against the vertical side wall of the feed seat. A bolt threaded onto the vertical side wall of the feed seat and connected to the front end of the support shaft is threaded through it. The support shaft provides stable support for the feed seat, enhancing the connection strength and stability between the feed seat and the main body. During sewing, even under heavy loads such as thick materials, the feed seat will not easily shake, thus ensuring that the auxiliary feed dog can stably perform the feeding action, further improving the feeding effect of the feeding mechanism and the sewing quality of the sewing machine.

[0016] In the feeding mechanism of the aforementioned sewing machine, the rear end of the horizontal sidewall of the feed seat is bent downwards, and a bolt 2, threadedly connected to the main body, is threaded through this bent portion. By connecting the bent portion of the horizontal sidewall of the feed seat to the main body using bolt 2, the connection stability between the feed seat and the main body is further enhanced, allowing the feed seat to better withstand various external forces during sewing and preventing loosening or displacement.

[0017] Compared with existing technologies, the feeding mechanism of this sewing machine has the following advantages: When sewing thick materials, the teeth at the front end of the auxiliary feed dog can pass through the clearance groove on the sewing table and work with the auxiliary presser foot to elastically clamp the fabric. This applies a forward pulling force to the thick material, achieving the effect of pulling and feeding the thick material from the front side of the main presser foot. This design can more stably move the thick material, reducing wrinkles and jamming during sewing, resulting in neater and more beautiful stitches and improving sewing quality. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the sewing machine.

[0019] Figure 2 This is a front view of the feeding mechanism.

[0020] Figure 3 This is a partial structural diagram of a sewing machine.

[0021] Figure 4 This is a structural diagram of the lifting arm, main feed dog, and auxiliary feed dog.

[0022] Figure 5 This is a partial structural diagram of the feeding mechanism.

[0023] Figure 6 It is a sectional view of the main presser foot, presser foot base, and auxiliary presser foot.

[0024] Figure 7 This is a three-dimensional structural diagram of the main presser foot, presser foot base, and auxiliary presser foot.

[0025] Figure 8 This is a three-dimensional structural diagram of the presser foot base.

[0026] Figure 9 It is an exploded view of the lifting arm, main feed dog, and auxiliary feed dog.

[0027] Figure 10 This is a partial structural diagram of the base.

[0028] In the diagram, 1. Machine base; 1a. Sewing table; 1b. Main body; 1c. Feed seat; 1c 1. Relief groove; 2. Presser foot lifting shaft; 3. Lifting arm; 4. Main feed dog; 5. Main presser foot; 51. Bolt hole; 6. Presser foot seat; 61. Guide sleeve; 611. Guide hole; 62. Plate-shaped connecting part; 621. Slide groove; 7. Auxiliary feed dog; 71. Tooth; 8. Push spring; 9. Auxiliary presser foot; 91. Presser foot shaft; 92. Presser foot plate; 93. Limit pin; 10. Presser cap; 11. Support shaft; 12. Bolt one; 13. Bolt two; 14. Differential feed arm; 15. Differential feed dog; 16. Adjusting bolt; 17. Fastening bolt. Detailed Implementation

[0029] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0030] like Figure 1 , Figure 2 and Figure 3 As shown, the feeding mechanism of this sewing machine includes a base 1 with a sewing table 1a and a presser foot lifting shaft 2 mounted on the base 1. The feeding mechanism includes a lifting dog arm 3, a differential dog arm 14, and a main feed dog 4 fixedly connected to the front end of the lifting dog arm 3, all located within the base 1. A differential feed dog 15 is fixedly connected to the front end of the differential dog arm 14. The driving and movement methods of the lifting dog arm 3 and the differential dog arm 14 can employ existing technologies, which will not be described in detail here. Furthermore, the lower end of the presser foot lifting shaft 2 is connected to a main presser foot 5, which is vertically opposite to the main feed dog 4.

[0031] like Figure 4 , Figure 5 and Figure 6 As shown, this feeding mechanism also includes a presser foot seat 6, an auxiliary feed dog 7 in the shape of a "﹂", and a push spring 8 disposed inside the presser foot seat 6. The presser foot seat 6 is located in front of the main presser foot 5 and is fixedly connected to the main presser foot 5. An auxiliary presser foot 9 is slidably connected to the presser foot seat 6 along its vertical direction. Under the action of the push spring 8, the auxiliary presser foot 9 presses downward against the presser foot seat 6. The rear end of the auxiliary feed dog 7 is fixedly connected to the lifting arm 3. Figure 2 As shown, its front end is bent upwards and has teeth 71 integrally formed on the top surface that are vertically opposite to the auxiliary pressure foot 9.

[0032] like Figure 7 and Figure 8 As shown, the presser foot seat 6 is a component formed by integrally molding a plate-shaped connecting part 62 on the outer peripheral wall of a cylindrical guide sleeve 61. The auxiliary presser foot 9 includes a vertically arranged presser foot shaft 91 and a presser foot plate 92 hinged to the lower end of the presser foot shaft 91. The upper end of the presser foot shaft 91 slides through the guide sleeve 61. The plate-shaped connecting part 62 protrudes rearward relative to the guide sleeve 61, and the presser foot seat 6 is fixedly connected to the main presser foot 5 through its plate-shaped connecting part 62. A strip-shaped guide hole 611 is vertically opened on the outer peripheral wall of the guide sleeve 61. The auxiliary presser foot 9 also includes a limiting pin 93 vertically connected to the upper end of the presser foot shaft 91. The limiting pin 93 slides with the guide hole 611. Under the action of the push spring 8, the limiting pin 93 abuts against the lower end wall of the guide hole 611.

[0033] like Figure 6As shown, a pressure cap 10 is threaded onto the upper end of the guide sleeve 61. A push spring 8 is disposed inside the guide sleeve 61 of the presser foot seat 6. The upper end of the push spring 8 abuts against the pressure cap 10, and the lower end abuts against the upper end face of the presser foot shaft 91. By rotating the pressure cap 10, the compression of the push spring 8 can be changed, thereby adjusting the pressure applied by the push spring 8 to the auxiliary presser foot 9. This allows the pressure of the auxiliary presser foot 9 on the fabric to be adjusted according to the thickness of the fabric.

[0034] like Figure 7 and Figure 8 As shown, the plate-shaped connecting part 62 is L-shaped. Its rearmost sidewall is parallel to and abuts the front end face of the main pressure foot 5 and is slidably connected to the main pressure foot 5 in the left-right direction. An adjusting bolt 16 is provided on this sidewall of the plate-shaped connecting part 62, and a sliding groove 621 is formed in the left-right direction. A bolt hole 51 is formed on the front end face of the main pressure foot 5. The rod of the adjusting bolt 16 passes through the sliding groove 621 and is threadedly connected to the bolt hole 51. This design allows the left-right position of the auxiliary pressure foot 9 to be adjusted, thereby ensuring the relative positional accuracy between the auxiliary pressure foot 9 and the main pressure foot 5.

[0035] Combination Figure 4 and Figure 9 As shown, the rear end of the auxiliary feed dog 7 is fixedly connected to the front end of the lifting arm 3. Specifically, the lower end of the main feed dog 4 is plate-shaped and vertically positioned. The front end of the lifting arm 3 and the rear end of the auxiliary pressure foot 9 are both plate-shaped and parallel to the lower end of the main feed dog 4. The lower end of the main feed dog 4 is clamped between the front end of the lifting arm 3 and the rear end of the auxiliary pressure foot 9, and the three are fixedly connected by fastening bolts 17. This structure not only enhances the connection stability between the main feed dog 4, the lifting arm 3, and the auxiliary pressure foot 9.

[0036] like Figure 10 As shown, the machine base 1 includes a main body 1b and a feed seat 1c fixedly connected to the front end face of the main body 1b. The feed seat 1c is L-shaped. One side wall of the feed seat 1c is horizontally arranged and forms part of the sewing table surface 1a. A clearance groove 1c1 for the teeth 71 to pass through is provided on this side wall. The other side wall of the feed seat 1c is parallel to the front end face of the main body 1b, and a support shaft 11 is vertically connected between this side wall and the front end face of the main body 1b. The rear end of the support shaft 11 is fixedly connected to the main body 1b, and the front end face of the support shaft 11 abuts against the vertical side wall of the feed seat 1c. A bolt 12 threadedly connected to the front end of the support shaft 11 is threaded through the vertical side wall of the feed seat 1c. The rear end of the horizontal side wall of the feed seat 1c is bent downward, and a bolt 23 threadedly connected to the main body 1b is threaded through the bent portion.

[0037] During sewing, the presser foot 6 is fixedly connected to the main presser foot 5, allowing the main presser foot 5 to drive the presser foot 6 to rise and fall synchronously. Simultaneously, the auxiliary presser foot 9 is vertically slidably connected to the presser foot 6, and under the action of the push spring 8, the auxiliary presser foot 9 presses downward against the presser foot 6, causing the presser foot 6 to move upward together with the auxiliary presser foot 9. Conversely, when the presser foot 6 moves downward, it drives the auxiliary presser foot 9 downward, applying elastic pressure to the fabric.

[0038] Based on this, since the auxiliary feed dog 7 is fixedly connected to the lifting dog arm 3, the auxiliary feed dog 7 and the main feed dog 4 move synchronously with the same action. Thus, when sewing thick materials, the teeth 71 at the front end of the auxiliary feed dog 7 can pass through the relief groove 1c 1 on the sewing table 1a, and work with the auxiliary presser foot 9 to elastically clamp the fabric. This adapts to the thickness of the thick material and applies a forward pulling force, achieving the effect of pulling and feeding the thick material from the front side of the main presser foot 5. This design increases the working area and force when feeding thick materials, enabling more stable movement of the thick material, reducing wrinkles and jamming during sewing, resulting in neater and more aesthetically pleasing stitches, and improving sewing quality.

[0039] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0040] Although this article uses a lot of terms such as 1. machine base; 1a. sewing table; 1b. main body; 1c. feed seat; 1c1. clearance groove; 2. presser foot lifting shaft; 3. lifting arm; 4. main feed dog; 5. main presser foot; 51. bolt hole; 6. presser foot seat; 61. guide sleeve; 611. guide hole; 62. plate-shaped connecting part; 621. slide groove; 7. auxiliary feed dog; 71. tooth; 8. push spring; 9. auxiliary presser foot; 91. presser foot shaft; 92. presser foot plate; 93. limit pin; 10. presser cap; 11. support shaft; 12. bolt one; 13. bolt two; 14. differential feed arm; 15. differential feed dog; 16. adjusting bolt; 17. fastening bolt, etc., the possibility of using other terms cannot be excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would be contrary to the spirit of this utility model.

Claims

1. A feeding mechanism for a sewing machine, the sewing machine comprising a base (1) and a presser foot lifting shaft (2) disposed on the base (1), the feeding mechanism comprising a lifting arm (3) disposed within the base (1) and a main feed dog (4) fixedly connected to the front end of the lifting arm (3), the lower end of the presser foot lifting shaft (2) being connected to a main presser foot (5) disposed vertically opposite to the main feed dog (4), characterized in that, The feeding mechanism also includes a presser foot seat (6), an auxiliary feed tooth (7) in the shape of "﹂", and a push spring (8) set in the presser foot seat (6). The presser foot seat (6) is located in front of the main presser foot (5) and is fixedly connected to the main presser foot (5). An auxiliary presser foot (9) is slidably connected to the presser foot seat (6) in the vertical direction. Under the action of the push spring (8), the auxiliary presser foot (9) abuts against the presser foot seat (6) downward. The rear end of the auxiliary feed tooth (7) is fixedly connected to the tooth lifting arm (3), and the front end is bent upward and integrally formed with teeth (71) that are vertically opposite to the auxiliary presser foot (9) on the top surface.

2. The feeding mechanism of the stitching machine according to claim 1, characterized in that, The presser foot seat (6) is a component with a plate-shaped connecting part (62) integrally formed on the outer peripheral wall of the cylindrical guide sleeve (61). The auxiliary presser foot (9) includes a vertically arranged presser foot shaft (91) and a presser foot plate (92) hinged to the lower end of the presser foot shaft (91). The upper end of the presser foot shaft (91) slides through the guide sleeve (61). The plate-shaped connecting part (62) protrudes backward relative to the guide sleeve (61), and the presser foot seat (6) is fixedly connected to the main presser foot (5) through its plate-shaped connecting part (62).

3. The feeding mechanism of the stitching machine according to claim 2, characterized in that, The guide sleeve (61) has a strip-shaped guide hole (611) vertically opened on the outer peripheral wall. The auxiliary pressure foot (9) also includes a limiting pin (93) vertically connected to the upper end of the pressure foot shaft (91). The limiting pin (93) slides with the guide hole (611). Under the action of the push spring (8), the limiting pin (93) abuts against the lower end wall of the guide hole (611).

4. The feeding mechanism of the stitching machine according to claim 3, characterized in that, The upper end of the guide sleeve (61) is threaded with a pressure cap (10), and the push spring (8) is disposed inside the guide sleeve (61). The upper end of the push spring (8) abuts against the pressure cap (10), and the lower end abuts against the upper end face of the pressure foot shaft (91).

5. The feeding mechanism of the sewing machine according to claim 2, 3, or 4, characterized in that, The plate-shaped connecting part (62) is L-shaped. Its relatively rear side wall is parallel to and abuts against the front end face of the main pressure foot (5) and is slidably connected to the main pressure foot (5) in the left and right direction. An adjusting bolt (16) is provided on the side wall of the plate-shaped connecting part (62) and a sliding groove (621) is provided in the left and right direction. A bolt hole (51) is provided on the front end face of the main pressure foot (5). The rod of the adjusting bolt (16) passes through the sliding groove (621) and is threadedly connected to the bolt hole (51).

6. The feeding mechanism of the sewing machine according to claim 1, 2, 3, or 4, characterized in that, The rear end of the auxiliary feed tooth (7) is fixedly connected to the front end of the tooth lifting arm (3).

7. The feeding mechanism of the stitching machine according to claim 6, characterized in that, The lower end of the main feed tooth (4) is plate-shaped and vertically arranged. The front end of the lifting arm (3) and the rear end of the auxiliary pressure foot (9) are both plate-shaped and parallel to the lower end of the main feed tooth (4). The lower end of the main feed tooth (4) is clamped between the front end of the lifting arm (3) and the rear end of the auxiliary pressure foot (9) and the three are fixedly connected by fastening bolts (17).

8. The feeding mechanism of the sewing machine according to claim 1, 2, 3, or 4, characterized in that, The base (1) includes a main body (1b) and a feed seat (1c) fixedly connected to the front end face of the main body (1b). The feed seat (1c) is L-shaped plate. One side wall of the feed seat (1c) is horizontally arranged and a relief groove (1c1) is provided on the side wall for the teeth (71) of the auxiliary feed tooth (7) to pass through.

9. The feeding mechanism of the stitching machine according to claim 8, characterized in that, The other side wall of the feed seat (1c) is parallel to the front end face of the main body (1b), and a support shaft (11) is vertically connected between the side wall and the front end face of the main body (1b). The rear end of the support shaft (11) is fixedly connected to the main body (1b), and the front end face of the support shaft (11) abuts against the vertical side wall of the feed seat (1c). A bolt (12) threadedly connected to the front end of the support shaft (11) is provided on the vertical side wall of the feed seat (1c).

10. The feeding mechanism of the stitching machine according to claim 8, characterized in that, The rear end of the horizontal sidewall of the feed seat (1c) is bent downward, and a bolt (13) threadedly connected to the main seat body (1b) is inserted at the bent portion.

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