A feeding mechanism of a sewing machine and a sewing machine

Abstract

The present application provides a cloth feeding mechanism and a sewing machine for a sewing machine, specifically relating to the technical field of sewing machine manufacturing. The cloth feeding mechanism has a cloth feeding drive source and a lifter drive source. The cloth feeding drive source indirectly drives the tooth carrier of the cloth feeding mechanism. While the cloth feeding drive source indirectly drives the tooth carrier, the lifter drive source directly drives the same tooth carrier to generate a swinging motion. The tooth carrier and its cloth feeding teeth, under the combined action of the lifter drive source and the cloth feeding drive source, cause the cloth feeding teeth to perform a cloth feeding action. By using the cloth feeding drive source to indirectly drive the tooth carrier of the cloth feeding mechanism, and while the cloth feeding drive source indirectly drives the tooth carrier, the lifter drive source directly drives the same tooth carrier to generate a swinging motion, it is realized that the tooth carrier and its cloth feeding teeth, under the combined action of the lifter drive source and the cloth feeding drive source, cause the cloth feeding teeth to perform a cloth feeding action. The present application makes full use of the drive source of the sewing machine, effectively improves the utilization efficiency of the power of the sewing machine, greatly reduces the manufacturing cost of the sewing machine, and has high value for use and promotion.

Description

Technical Field

[0001] The present application provides a feed mechanism for a sewing machine and a sewing machine, specifically relating to the technical field of sewing machine manufacturing. Background Art

[0002] The feed dog is a key part for a sewing machine to achieve sewing. The company previously proposed a feed dog assembly for a separable sewing machine. The specific solution is that the feed dog assembly has an up-and-down lifting motor and a front-and-back feed driving source that apply a non-lateral swinging source to the feed dog. The up-and-down lifting motor and the front-and-back feed driving source indirectly act on the feed dog to perform the feeding action. The front-and-back feed driving source drives a turntable and then drives a connecting rod. The connecting rod is movably connected to an eccentric position of the turntable, and the connecting rod is movably connected to a feed dog connecting frame. By using the up-and-down lifting motor and the front-and-back feed driving source to transmit a swinging source to the feed dog assembly, the feed dog assembly can be installed on a bobbin mechanism and can be manufactured into a modular unit for use on various sewing machines. In the above sewing machine, it is also necessary to install a thread cutting and presser foot lifting device, and a power device for driving the above thread cutting and presser foot lifting actions needs to be installed, which increases the manufacturing cost of the sewing machine. Summary of the Invention

[0003] Aiming at the problem of increased manufacturing cost existing in the above-mentioned sewing machine, the present application particularly provides a feed mechanism for a sewing machine, characterized in that the feed mechanism has a feed driving source and a lifting driving source, and the feed driving source indirectly drives the tooth frame of the feed mechanism; while the feed driving source indirectly drives the tooth frame, the lifting driving source directly drives the same tooth frame to generate a swinging action, and the tooth frame and its feed dog make the feed dog generate a feeding action under the combined action of the lifting driving source and the feed driving source.

[0004] Preferably, sliding grooves are respectively arranged on both sides of the tooth frame, and a first limiting baffle and a second limiting baffle are respectively matched with the sliding grooves on both sides of the tooth frame. The first limiting baffle and the second limiting baffle are hinged by a connecting rod. The lifting driving source is installed on a static adjusting bracket. The front output shaft of the lifting driving source passes through the static adjusting bracket and is fixedly connected to the first limiting baffle. The lifting driving source drives and transmits a back-and-forth swinging action to the first limiting baffle in a reciprocating rotation manner and transmits it to the second limiting baffle, so that the tooth frame generates an up-and-down moving action.

[0005] Preferably, the feed mechanism includes a front-and-back feed swinging assembly, and a positioning groove is further provided on the tooth frame for the above-mentioned front-and-back feed swinging assembly to be inserted and matched, and the feed driving source drives the front-and-back feed swinging assembly in a reciprocating rotation manner to make the tooth frame generate a front-and-back moving action.

[0006] Preferably, the front and rear cloth feed swing assembly includes a follower plate, a fixed limit plate, a sliding part, a connecting shaft, an insertion rod, an outer rotating plate and an inner sliding plate, as well as a running groove inside the static adjustment bracket. The outer rotating plate has an axial hole for fixing the cloth feed drive source, the inner sliding plate fits inside the outer rotating plate, one end of the inner sliding plate is connected to the sliding part, and the other end of the inner sliding plate is connected to the connecting shaft. The upper end of the follower plate is connected and fixed with an insertion rod, a bearing is provided between the follower plate and the connecting shaft, the other end of the insertion rod cooperates with the positioning groove of the tooth frame, the fixed limit plate is arranged between the tooth frame and the follower plate, and the insertion rod passes through the limiting part of the fixed limit plate.

[0007] Preferably, the sliding member is arranged and operates in the running groove of the static adjustment bracket, the running groove comprises a stitch groove, a transition groove 1, a transition groove 2, a thread trimming groove and a presser foot lifting groove, the stitch groove is located between the transition groove 1 and the transition groove 2, the stitch groove is opposite to the thread trimming groove and the presser foot lifting groove, the stitch groove, the thread trimming groove and the presser foot lifting groove are all in arc shape, the stitch groove, the thread trimming groove and the presser foot lifting groove are arranged on the same circle center, an axial hole fixed to the cloth feeding drive source is arranged on the circle center of the running groove, the running groove is a closed-loop groove around which the sliding member can rotate,

[0008] Preferably, the positioning groove is arranged on one side of the limiting baffle plate 2 of the tooth frame, and a bobbin clearance cavity is provided in the middle of the tooth frame.

[0009] Preferably, the cloth feed drive source moves the slide from the needle spacing groove through the second transition groove into the thread trimming groove, so that the connecting shaft is concentric with the front output shaft of the cloth feed drive source. At this time, the cloth feed drive source does not apply an up and down movement to the connecting shaft.

[0010] The present application also proposes a sewing machine, which also has a thread trimming mechanism and a presser foot lifting mechanism, and is characterized in that the sewing machine has a cloth feeding drive source and a presser foot lifting drive source. After the sewing machine finishes feeding the cloth and stops sewing, the cloth feeding drive source first executes the thread trimming action of the thread trimming mechanism and then executes the presser foot lifting action of the presser foot lifting mechanism. The presser foot lifting drive source uses a stepping motor or a servo motor.

[0011] Preferably, the thread cutting mechanism includes a thread cutting fork wheel, a thread cutting eccentric wheel, a thread cutting connecting rod, and a thread cutting end effector. The thread cutting fork wheel has a thread cutting rod and a return rod. The thread cutting fork wheel is fixedly installed on the rear output shaft of the cloth feeding drive source. An actuating rod is provided at the eccentric position of the thread cutting eccentric wheel. The thread cutting connecting rod is hinged to the thread cutting rod. The actuating rod is located between the thread cutting rod and the return rod. When the thread cutting rod is pushed by the cloth feeding drive source, the thread cutting end effector performs a thread cutting action driven by the thread cutting connecting rod. After thread cutting is completed, the cloth feeding drive source drives the thread cutting rod to continue rotating until it acts on the return rod to force the entire thread cutting mechanism to return. The cloth feeding drive source drives the sliding member through the thread cutting groove, and the rear output shaft of the cloth feeding drive source drives the relevant components of the thread cutting mechanism to perform a thread cutting action. The cloth feeding drive source 11 uses a stepper motor or a servo motor.

[0012] Preferably, the presser foot lifting mechanism includes a presser foot lifting cam and a presser foot lifting lever. The presser foot lifting cam is on the rear output shaft of the cloth feeding drive source. The presser foot lifting cam is located behind the thread cutting eccentric wheel. The cam portion of the presser foot lifting cam acts on the presser foot lifting lever. A lever shaft is provided at the middle position of the presser foot lifting lever so that the presser foot lifting action is implemented under the action of the presser foot lifting cam. When the cloth feeding drive source drives the sliding member to move towards the presser foot lifting groove, the presser foot lifting action is implemented.

[0013] Compared with the prior art, the novel sewing machine structure of the present application indirectly drives the tooth carrier of the cloth feeding mechanism by the cloth feeding drive source. While the cloth feeding drive source indirectly drives the tooth carrier, the tooth lifting drive source directly drives the same tooth carrier to generate a swinging action, so that the tooth carrier and its feed dog generate a cloth feeding action under the combined action of the tooth lifting drive source and the cloth feeding drive source. The present application makes full use of the drive source of the sewing machine, effectively improves the use efficiency of the power of the sewing machine, greatly reduces the manufacturing cost of the sewing machine, further improves the intelligent control level of the sewing machine, and has high application and promotion value. Description of the Drawings

[0014] Figure 1 is a schematic diagram of the installation position of the cloth feeding mechanism of a sewing machine of the present application and the sewing machine cloth feeding mechanism;

[0015] Figure 2 is the structure of the cloth feeding mechanism of a sewing machine of the present application, the sewing machine cloth feeding mechanism, the thread cutting mechanism, and the presser foot lifting mechanism;

[0016] Figure 3 is a schematic diagram of the cloth feeding mechanism of a sewing machine of the present application and the sewing machine cloth feeding mechanism;

[0017] Figure 4 is a schematic diagram of the cloth feeding mechanism of a sewing machine of the present application, the sewing machine cloth feeding mechanism, the up-and-down transfer assembly, and the front-and-back transfer mechanism;

[0018] Figure 5This is a structural diagram of a cloth feeding mechanism and a sewing machine tooth frame of a sewing machine of the present application;

[0019] Figure 6 This is a structural diagram of a cloth feeding mechanism and a static needle distance and positioning adjustment wheel of a sewing machine of the present application;

[0020] Figure 7 It is a schematic diagram of a cloth feeding mechanism of a sewing machine and a running angle of a sewing machine motor of the present application;

[0021] Figure 8 The present invention discloses a schematic diagram of a cloth feeding mechanism, a thread trimming mechanism and a presser foot lifting mechanism of a sewing machine.

[0022] Reference numerals: cloth feeding mechanism 10, cloth feeding driving source 11, tooth lifting driving source 12, limit baffle 121, limit baffle 2 122, connecting rod 123, tooth frame 13, shuttle core giving cavity 131, slide groove 132, positioning groove 133, cloth feeding tooth 14, front and rear cloth feeding swing assembly 15, follower plate 151, fixed limit plate 152, limit part 1521, sliding member 153, outer rotating plate 154, inner sliding plate 155, connecting Shaft 156, insert rod 157, thread trimming mechanism 20, thread trimming fork wheel 21, return rod 211, thread trimming rod 212, thread trimming eccentric wheel 22, action rod 221, thread trimming connecting rod 23, thread trimming end execution end 24, presser foot lifting mechanism 30, presser foot lifting cam 31, presser foot lifting lever 32, static adjustment bracket 41, running groove 411, stitch length groove 412, transition groove 1 413, transition groove 2 414, thread trimming groove 415, presser foot lifting groove 416. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-8 The preferred embodiments of the present application are described in detail so that the advantages and features of the present application can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present application. These implementation modes are only used to illustrate the present invention, and are not intended to limit the present invention.

[0024] Figure 1It is a feeding mechanism of a sewing machine and an overall structure diagram of the sewing machine according to this application. The sewing machine includes a feeding mechanism 10, a thread cutting mechanism 20, a presser foot lifting mechanism 30, and a control system. The above-mentioned feeding mechanism 10, thread cutting mechanism 20, and presser foot lifting mechanism 30 are provided with a feeding drive source 11 and a tooth lifting drive source 12. The feeding mechanism 10, thread cutting mechanism 20, and presser foot lifting mechanism 30 are driven by the feeding drive source 11 and the tooth lifting drive source 12. The specific division of labor is that the feeding drive source 11 and the tooth lifting drive source 12 drive the feeding mechanism 10 simultaneously to realize the feeding action of the feed dog 14 of the sewing machine; after the sewing machine finishes feeding and stops sewing, the feeding drive source 11 performs the thread cutting action of the thread cutting mechanism 20 and the presser foot lifting action of the presser foot lifting mechanism 30 at different times successively. The sewing machine of this application makes full use of the power device of the sewing machine and has a high energy utilization rate.

[0025] In Figures 1 to 7 this application, the feeding mechanism 10 of the sewing machine includes a tooth carrier 13, a feed dog 14 fixed to the tooth carrier 13, a front and rear feeding swing assembly 15, a feeding drive source 11, and a tooth lifting drive source 12. The feeding drive source 11 indirectly drives the tooth carrier 13; while the feeding drive source 11 indirectly drives the tooth carrier 13, the tooth lifting drive source 12 directly drives the same tooth carrier 13 to generate a swinging action, so that the feed dog 14 integrated with the tooth carrier 13 generates the feeding action of the sewing machine. Moreover, the above-mentioned feeding drive source 11 and tooth lifting drive source 12 both realize power output by reciprocating rotation. The reciprocating rotation of the above-mentioned feeding drive source 11 and tooth lifting drive source 12 is based on the preferred use of a stepper motor or a servo motor, and thus can efficiently realize the control of the sewing action under the control of the control system. The sewing machine of this application breaks the design concept of traditional sewing machines, removes the original swing seat device, and directly uses a motor to drive the tooth carrier 13 and its feed dog 14 to generate the sewing action. This application is logical, has a refined structure, and the sewing action of the feed dog 14 is completely controlled by the programming of the control system, and has high technical and popularization value.

[0026] The feed dog 14 is fixed to the upper part of the tooth frame 13, the middle part of the tooth frame 13 is provided with a bobbin clearance cavity 131, and the two sides of the tooth frame 13 are respectively provided with a slide groove 132. The bobbin clearance cavity 131 is used for the clearance of the rotary shuttle when the rotary shuttle is used during sewing. The slide grooves 132 on both sides of the tooth frame 13 are respectively matched with a limit baffle plate 121 and a limit baffle plate 2 122, and the limit baffle plate 121 and the limit baffle plate 2 122 are hinged by a connecting rod 123. The tooth lifting drive source 12 is installed on the static adjustment bracket 41. The front output shaft of the tooth lifting drive source 12 passes through the static adjustment bracket 41 and is fixedly connected to the limit baffle 1 121. The drive of the tooth lifting drive source 12 is transmitted to the limit baffle 1 121 in a back-and-forth rotation. The limit baffle 2 122 under the dynamic connection of the connecting rod 123 also makes the same back-and-forth rotation as the limit baffle 1 121, so that the tooth frame 13 and even the feed tooth 14 produce an up-and-down movement. Therefore, the synchronous operation of the limit baffle 1 121 and the limit baffle 2 122 causes the tooth frame 13 and even the feed tooth 14 to produce an up-and-down movement. The above-mentioned limit baffle 1 121 and the limit baffle 2 122 also have a limiting function. In this embodiment, the above-mentioned limit baffle 1 121 and the limit baffle 2 122 can also be used with bearings, or sleeves, etc., and the technical effects they play are the same.

[0027] The tooth frame 13 also has a positioning groove 133, which is used for the insertion and matching of the front and rear cloth feed swinging assembly 15 and the transmission of the swinging motion, that is, the cloth feed driving source 11 is connected to the front and rear cloth feed swinging assembly 15 and also drives the tooth frame 13 to make a corresponding swinging motion by rotating, which determines the role of the positioning groove 133 so that the tooth frame 13 and even the cloth feed tooth 14 produce a forward and backward movement. The positioning groove 133 of this embodiment is set on one side of the limit baffle 2 122 of the tooth frame 13, and the specific position of the positioning groove 133 can realize the transmission of the swinging motion.

[0028] The tooth frame 13 and its feed tooth 14 enable the feed tooth 14 to realize the cloth feeding function of the sewing machine under the joint action of the tooth lifting driving source 12 and the cloth feeding driving source 11. The front and rear cloth feeding swing assembly 15 is a key component for the tooth lifting driving source 12 to realize the front and rear cloth feeding action. It is not limited to the following specific implementation. Anything that plays the same role and enables the tooth frame 13 to produce the front and rear cloth feeding action is within the protection scope of this application.

[0029] The above-mentioned front and rear cloth feeding swing assembly specifically includes a follower plate 151, a fixed limit plate 152, a sliding member 153, a connecting shaft 156, a plug rod 157, an outer rotating plate 154 and an inner sliding plate 155, and an operation groove 411 inside the static adjustment bracket 41. The outer rotating plate 154 has a shaft hole for fixedly connecting the cloth feeding drive source 11. The inner sliding plate 155 is fitted inside the outer rotating plate 154. One end of the inner sliding plate 155 is connected to the sliding member 153, and the other end of the inner sliding plate 155 is connected to the connecting shaft 156. The upper end of the follower plate 151 is fixedly connected with a plug rod 157. The follower plate 151 is movably connected to the connecting shaft 156, and a bearing is provided between the two. The other end of the plug rod 157 is fitted with the positioning groove 133 of the tooth carrier 13. The fixed limit plate 152 is arranged between the tooth carrier 13 and the follower plate 151. The plug rod 157 passes through the limit portion 1521 of the fixed limit plate 152, and the limit portion 1521 is used to limit the operation range when the plug rod 157 operates.

[0030] Figure 7 It is a schematic diagram of the motor operation rotation angle of the cloth feeding mechanism of a sewing machine in this application, combined with the above-mentioned drawings. The above-mentioned sliding member 153 is configured and operates in the operation groove 411 of the static adjustment bracket 41. The operation groove 411 is a closed-loop groove for the sliding member 153 to rotate around. The operation groove 411 has a stitch pitch groove 412, a transition groove 413, a transition groove 414, a thread cutting groove 415 and a presser foot lifting groove 416. The stitch pitch groove 412 is located between the transition groove 413 and the transition groove 414. The stitch pitch groove 412 is opposite to the thread cutting groove 415 and the presser foot lifting groove 416. The stitch pitch groove 412 has the function of stitch pitch adjustment. In addition to their own thread cutting function and presser foot lifting function, the thread cutting groove 415 and the presser foot lifting groove 416 also have the function of positioning the zero position, that is, the function of positioning the zero stitch pitch of the feed dog 14. The stitch pitch groove 412, the thread cutting groove 415 and the presser foot lifting groove 416 are all arc-shaped, and the stitch pitch groove 412, the thread cutting groove 415 and the presser foot lifting groove 416 are arranged on the same center of the circle, and a shaft hole fixed to the cloth feeding drive source 11 is provided on this center of the circle.

[0031] In the stitch pitch adjustment, when the cloth feeding drive source 11 rotates in a reciprocating motion, the outer rotating plate 154 connected to it makes a reciprocating rotation, and drives the inner sliding plate 155 inside it to make the same reciprocating rotation. The sliding member 153 connected to the inner sliding plate 155 makes the inner sliding plate 155 move up and down while reciprocating in the arc-shaped stitch pitch groove 412. The up and down moving inner sliding plate 155 is transmitted to the tooth carrier 13 through the follower plate 151 and the plug rod 157, realizing the stitch pitch adjustment of the feed dog 14.

[0032] Figure 8It is a schematic diagram of the thread cutting mechanism 20 and the presser foot lifting mechanism 30 of a sewing machine according to the present application. After the sewing machine finishes feeding the cloth and stops sewing, the sewing machine needs to perform the thread cutting action first and then the presser foot lifting action. The cloth feeding drive source 11 moves the sliding member 153 from the stitch pitch groove 412 through the transition two groove 414 into the thread cutting groove 415, so that the connecting shaft 156 is concentric with the front output shaft of the cloth feeding drive source 11. Therefore, when the sliding member 153 operates in the thread cutting groove 415 and the presser foot lifting groove 416, the cloth feeding drive source 11 will not apply an up and down movement to the connecting shaft 156. In other words, the operation of the sliding member 153 in the thread cutting groove 415 and the presser foot lifting groove 416 will not have an actual impact on the tooth carrier 13.

[0033] When the cloth feeding drive source 11 drives the sliding member 153 through the thread cutting groove 415, the rear output shaft of the cloth feeding drive source 11 drives the relevant components of the thread cutting mechanism 20 to perform the thread cutting action. The thread cutting mechanism 20 includes a thread cutting fork wheel 21, a thread cutting eccentric wheel 22, a thread cutting connecting rod 23 and a thread cutting end actuator 24. The thread cutting fork wheel 21 has a thread cutting rod 212 and a return rod 211. The thread cutting fork wheel 21 is fixedly installed on the rear output shaft of the cloth feeding drive source 11. A working rod 221 is provided at the eccentric position of the thread cutting eccentric wheel 22. The thread cutting connecting rod 23 is hinged to the thread cutting rod 212. The working rod 221 is located between the thread cutting rod 212 and the return rod 211. When the thread cutting rod 212 is pushed by the cloth feeding drive source 11, the thread cutting end actuator 24 is driven by the thread cutting connecting rod 23 to perform the thread cutting action; after the thread cutting is completed, the cloth feeding drive source 11 drives the thread cutting rod 212 to continue to operate until it acts on the return rod 211 to forcibly return the entire thread cutting mechanism 20.

[0034] After the above thread cutting action is completed, the sliding member 153 is driven by the cloth feeding drive source 11 to move towards the presser foot lifting groove 416 to perform the presser foot lifting action. The presser foot lifting mechanism 30 includes a presser foot lifting cam 31 and a presser foot lifting lever 32. The presser foot lifting cam 31 is on the rear output shaft of the cloth feeding drive source 11, and the above presser foot lifting cam 31 is located behind the thread cutting eccentric wheel 22. The cam portion of the presser foot lifting cam 31 acts on the presser foot lifting lever 32, and a lever shaft is provided at the middle position of the presser foot lifting lever 32 to perform the presser foot lifting action under the action of the presser foot lifting cam 31.

[0035] The above is only one of the preferred embodiments of the present application, and does not limit the scope of the patent implementation of the present application. Any equivalent structural or equivalent process transformation made by using the shape, structure and principle of the description and drawings of the present application, or directly or indirectly applied to other related technical fields, are all covered within the scope of the patent protection of the present application.

Claims

1. A cloth feeding mechanism of a sewing machine, characterized in that, The feeding mechanism (10) has a feeding drive source (11) and a lifting tooth drive source (12). The feeding drive source (11) indirectly drives the tooth carrier (13) of the feeding mechanism (10). While the feeding drive source (11) indirectly drives the tooth carrier (13), the lifting tooth drive source (12) directly drives the same tooth carrier (13) to generate a swinging motion. The tooth carrier (13) and its feeding teeth (14) cause the feeding teeth (14) to perform a feeding action under the combined action of the lifting tooth drive source (12) and the feeding drive source (11). On both sides of the tooth carrier (13), there are chute grooves (132) respectively. The chute grooves (132) on both sides of the tooth carrier (13) are each matched with a first limit baffle (121) and a second limit baffle (122). The first limit baffle (121) and the second limit baffle (122) are hinged by a connecting rod (123). The lifting tooth drive source (12) is installed on the static adjustment bracket (41). The front output shaft of the lifting tooth drive source (12) passes through the static adjustment bracket (41) and is fixedly connected to the first limit baffle (121). The lifting tooth drive source (12) is driven in a reciprocating rotation manner, and transmits the reciprocating swinging motion to the first limit baffle (121) and then to the second limit baffle (122), causing the tooth carrier (13) to perform an up and down movement. The feeding mechanism (10) further includes a front and rear feeding swinging assembly (15). The tooth carrier (13) also has a positioning groove (133). The positioning groove (133) is used for the above-mentioned front and rear feeding swinging assembly (15) to be inserted and matched, and transmits the feeding drive source (11) to drive the front and rear feeding swinging assembly (15) in a reciprocating rotation manner, causing the tooth carrier (13) to perform a front and rear movement. The front and rear feeding swinging assembly (15) includes a follower plate (151), a fixed limit plate (152), a sliding member (153), a connecting shaft (156), an inserting rod (157), an outer rotating plate (154), an inner sliding plate (155), and a running groove (411) inside the static adjustment bracket (41). The outer rotating plate (154) has a shaft hole for the feeding drive source (11) to be fixedly connected. The inner sliding plate (155) is fitted inside the outer rotating plate (154). One end of the inner sliding plate (155) is connected to the sliding member (153), and the other end of the inner sliding plate (155) is connected to the connecting shaft (156). The upper end of the follower plate (151) is connected and fixed with an inserting rod (157). A bearing is arranged between the follower plate (151) and the connecting shaft (156). The other end of the inserting rod (157) is matched with the positioning groove (133) of the tooth carrier (13). The fixed limit plate (152) is arranged between the tooth carrier (13) and the follower plate (151). The inserting rod (157) penetrates through the limiting portion (1521) of the fixed limit plate (152).

2. The feeding mechanism of a sewing machine according to claim 1, wherein, The sliding member (153) is configured and operates in the running groove (411) of the static adjustment bracket (41). The running groove (411) has a stitch pitch groove (412), a first transition groove (413), a second transition groove (414), a thread trimming groove (415), and a presser foot lifting groove (416). The stitch pitch groove (412) is located between the first transition groove (413) and the second transition groove (414). The stitch pitch groove (412) is opposite to the thread trimming groove (415) and the presser foot lifting groove (416). The stitch pitch groove (412), the thread trimming groove (415), and the presser foot lifting groove (416) are all arc-shaped. The stitch pitch groove (412), the thread trimming groove (415), and the presser foot lifting groove (416) are set on the same center of the circle. An axial hole fixed to the feed driving source (11) is provided at the center of the running groove (411). The running groove (411) is a closed-loop groove for the sliding member (153) to rotate around. The presser foot lifting driving source (12) uses a stepping motor or a servo motor.

3. The feeding mechanism of a sewing machine according to claim 1, characterized in that, The positioning groove (133) is provided on one side of the limit baffle two (122) of the tooth carrier (13). The middle part of the tooth carrier (13) has a bobbin core accommodating cavity (131).

4. The feeding mechanism of a sewing machine according to claim 1, characterized in that, The feed driving source (11) moves the sliding member (153) from the stitch pitch groove (412) through the second transition groove (414) into the thread trimming groove (415), so that the connecting shaft (156) is concentric with the front output shaft of the feed driving source (11). At this time, the feed driving source (11) does not apply an up-and-down movement action to the connecting shaft (156).

5. A sewing machine, having the feeding mechanism of the sewing machine according to any one of claims 1 to 4 above, characterized in that, There is also a thread trimming mechanism (20) and a presser foot lifting mechanism (30). After the sewing machine finishes feeding and stops sewing, the feed driving source (11) first performs the thread trimming action of the thread trimming mechanism (20) and then performs the presser foot lifting action of the presser foot lifting mechanism (30).

6. A sewing machine according to claim 5, wherein, The thread trimming mechanism (20) has a thread trimming fork wheel (21), a thread trimming eccentric wheel (22), a thread trimming connecting rod (23), and a thread trimming end actuator (24). The thread trimming fork wheel (21) has a thread trimming rod (212) and a return rod (211). The thread trimming fork wheel (21) is installed and fixed on the rear output shaft of the feed driving source (11). A working rod (221) is provided at the eccentric position of the thread trimming eccentric wheel (22). The thread trimming connecting rod (23) is hinged to the thread trimming rod (212). The working rod (221) is located between the thread trimming rod (212) and the return rod (211). The thread trimming rod (212) is driven by the feed driving source (11) to push the thread trimming rod (212), and the thread trimming end actuator (24) is driven by the thread trimming connecting rod (23) to perform the thread trimming action. After the thread trimming is completed, the feed driving source (11) drives the thread trimming rod (212) to continue to rotate until it acts on the return rod (211) to forcibly return the entire thread trimming mechanism (20). The feed driving source (11) drives the sliding member (153) through the thread trimming groove (415). The feed driving source (11) uses a stepping motor or a servo motor.

7. A sewing machine according to claim 5, characterized in that, The presser foot lifting mechanism (30) has a presser foot lifting cam (31) and a presser foot lifting lever (32). The presser foot lifting cam (31) is on the rear output shaft of the cloth feeding drive source (11). The presser foot lifting cam (31) is located behind the thread cutting eccentric cam (22). The cam portion of the presser foot lifting cam (31) acts on the presser foot lifting lever (32). A lever shaft is provided at the middle position of the presser foot lifting lever (32) so that the presser foot lifting action is implemented under the action of the presser foot lifting cam (31). Driven by the cloth feeding drive source (11), the sliding member (153) moves towards the presser foot groove (416) to implement the presser foot lifting action.

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