Cloth feeding mechanism of sewing machine

Abstract

The utility model discloses a cloth feeding mechanism of a sewing machine. The cloth feeding mechanism comprises a fixed side plate, a half-sleeve-shaped cloth feeding cylinder, a driving tooth frame, a differential tooth frame, a tooth transmission assembly, a driving transmission assembly, a differential transmission assembly and a lifting transmission assembly. The cloth feeding cylinder is detachably installed on one side of the fixed side plate, the driving transmission assembly, the differential transmission assembly and the lifting transmission assembly are installed on the other side of the fixed side plate, and the driving tooth frame, the differential tooth frame and the tooth transmission assembly are all arranged in the cloth feeding cylinder. The driving tooth frame comprises a driving swing arm and a driving swing frame which are integrally connected, the driving swing frame is located at the lower end of the driving swing arm, the differential tooth frame comprises a differential swing arm and a differential swing frame which are integrally connected, and the driving swing frame and the differential swing frame abut against each other in a sliding mode and are the same in shape. The transmission efficiency and the cloth feeding stability of the cloth feeding mechanism are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a cloth feeding mechanism of a sewing machine. Background Art

[0002] The feed mechanism of a sewing machine usually refers to the part of the sewing machine used to transmit fabric and control the movement of fabric. This mechanism usually includes the feeder, presser foot, needle plate, needle and other parts. The function of the feed mechanism is to convey the fabric along a certain path during the sewing process so that the needle and thread can accurately pass through the fabric and form the required stitches. The design and operation of the feed mechanism directly affects the sewing effect and efficiency of the sewing machine.

[0003] The feeding mechanism of a sewing machine is disclosed in a patent document (application number: 202322650465.9), which includes a base, a main feed tooth rack, a differential tooth rack and a feeding boss protruding from the side wall of the base, the feeding boss is provided with a main feed tooth and a differential feed tooth, the main feed tooth rack and the differential tooth rack are both arranged in the base, and the feeding boss is provided with a main cantilever and a differential cantilever both in the shape of a strip, the inner end of the main cantilever extends into the base and is fixedly connected to the main feed tooth rack, the inner end of the differential cantilever extends into the base and is fixedly connected to the differential tooth rack, the outer end of the main cantilever is fixedly connected to the main feed tooth and the outer end of the differential cantilever is fixedly connected to the differential feed tooth. In the patent document, the structure of the differential adjustment component is complex and is arranged in the accommodating cavity of the base, while the two cantilevers are arranged outside the base, which means that the two cantilevers must be long enough to be transmission-connected with the differential adjustment component inside the base, which in turn causes the torque between the differential adjustment component and the two cantilevers to be too long, so the transmission efficiency of the differential adjustment component to the two cantilevers is low. At the same time, the excessive torque between the differential adjustment component and the two cantilevers can easily cause the differential adjustment component to shake during the transmission of the two cantilevers, affecting the feeding stability. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a cloth feeding mechanism for a sewing machine, which is used to improve the transmission efficiency and cloth feeding stability of the cloth feeding mechanism.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a cloth feeding mechanism of a sewing machine, comprising a fixed side plate, a semi-sleeve-shaped cloth feeding cylinder, an active gear rack, a differential gear rack, a gear transmission assembly, an active transmission assembly, a differential transmission assembly and a lifting transmission assembly;

[0006] The cloth feeding cylinder is detachably mounted on one side of the fixed side plate, the active transmission assembly, the differential transmission assembly and the lifting transmission assembly are mounted on the other side of the fixed side plate, and the active gear rack, the differential gear rack and the gear transmission assembly are all arranged inside the cloth feeding cylinder;

[0007] The driving tooth frame includes a driving swing arm and a driving swing bracket which are integrally connected. The driving swing bracket is located at the lower end of the driving swing arm. The differential tooth frame includes a differential swing arm and a differential swing bracket which are integrally connected. The driving swing bracket and the differential swing bracket are in sliding contact with each other and have the same shape. Horizontal openings are provided on both sides of the driving swing bracket and the differential swing bracket, and lifting openings are provided in the middle of both of them.

[0008] The tooth transmission assembly includes a pair of lifting sliders, a pair of driving sliders, a driving swing member, a driving transmission shaft, a differential swing member, a differential transmission shaft, a driving drive shaft, a driving cam, a differential drive shaft and a differential cam.

[0009] The lifting sliders are lifted and slid within the lifting openings, and the driving sliders are horizontally slid within the horizontal openings. One end of the driving swing member is rotatably connected to the outer center of one of the lifting sliders, and the other end is fixedly connected to the driving transmission shaft. The differential transmission shaft is rotatably sleeved outside the driving transmission shaft. One end of the differential swing member is rotatably connected to the outer center of the other lifting slider, and the other end is fixedly connected to the differential transmission shaft. The driving transmission shaft and the differential transmission shaft rotatably penetrate through the fixed side plate and are respectively fixedly connected to the driving transmission assembly and the differential transmission assembly.

[0010] One end of the driving drive shaft is fixedly connected to the center of the wheel of the driving cam, and the other end rotatably penetrates through the fixed side plate and is fixedly connected to the lifting transmission assembly. One end of the differential drive shaft is fixedly connected to the center of the wheel of the differential cam, and the other end rotatably penetrates through the fixed side plate and is fixedly connected to the lifting transmission assembly. The eccentric ends of the driving cam and the differential cam are respectively rotatably connected to a pair of driving sliders.

[0011] Further, the driving transmission assembly includes a driving transmission crankshaft, a first swing member and a second swing member. One end of the driving transmission crankshaft facing the fixed side plate is rotatably connected to one end of the first swing member. The other end of the first swing member is rotatably connected to one end of the second swing member. The other end of the second swing member is fixedly connected to the driving transmission shaft. The end of the driving transmission crankshaft away from the fixed side plate is fixedly connected to a first driving source, and the first driving source is used to drive the driving transmission crankshaft to rotate periodically in the clockwise or counterclockwise direction.

[0012] Further, the differential transmission assembly includes a driving connecting rod. One end of the driving connecting rod is fixedly connected to a second driving source, and the other end is fixedly connected to the differential transmission shaft. The second driving source is used to drive the differential transmission shaft to rotate periodically in the clockwise or counterclockwise direction.

[0013] Further, copper bushings are rotatably sleeved outside the differential drive shaft, the driving drive shaft and the differential transmission shaft.

[0014] Further, the lifting transmission assembly includes a driving transmission frame, a driving connecting rod, and a third swinging member. The lower end of the driving transmission frame is fixedly connected to a third driving source. The two ends of the driving connecting rod are respectively rotatably connected to the upper end of the driving transmission frame and the upper end of the third swinging member. The lower end of the third swinging member is fixedly connected to the differential driving shaft. The main driving shaft is fixedly inserted in the middle of the driving transmission frame. The third driving source is used to drive the driving transmission frame to rotate periodically in the clockwise or counterclockwise direction.

[0015] Further, a crochet component is further included. A semicircular notch is provided at the upper end of the fixed side plate. The middle part of the driving connecting rod is bent upward to form an arc-shaped bending part. A crochet movement opening is formed between the semicircular notch and the arc-shaped bending part. The crochet component passes through the crochet movement opening and extends into the cloth feeding cylinder. The crochet component includes a crochet support and a lower crochet. The lower crochet is detachably connected to the front end of the crochet support. The rear end of the crochet support is located in the crochet movement opening. The rear end of the crochet support is fixedly connected to a horizontal driving source. The horizontal driving source is used to drive the crochet support to perform horizontal telescopic movement.

[0016] Further, the upper end of the main swing arm is detachably connected to a main gear. The upper end of the differential swing arm is detachably connected to a differential gear. The side end of the differential gear is detachably connected to a differential pinion. A needle plate is detachably installed on the cloth feeding cylinder. A plurality of tooth holes are formed in the needle plate. The main gear, the differential gear, and the differential pinion move in the tooth holes.

[0017] Further, an arc-shaped outer edge is provided at the place where the cloth feeding cylinder is in contact with and abuts against the fixed side plate. A plurality of first screw holes are formed in the arc-shaped outer edge. A plurality of second screw holes are formed in the fixed side plate. The positions of the first screw holes and the second screw holes correspond to each other. A tightening bolt is threadedly connected between the first screw hole and the second screw hole.

[0018] Further, the circumference of the cloth feeding end of the cloth feeding cylinder is 116 mm.

[0019] Advantages of the present utility model:

[0020] By arranging the main gear rack, the differential gear rack, and the tooth transmission assembly inside the cloth feeding cylinder, installing the cloth feeding cylinder on one side of the fixed side plate, and installing the main transmission assembly, the differential transmission assembly, and the lifting transmission assembly on the other side of the fixed side plate, the present utility model significantly reduces the torque between the main gear rack, the differential gear rack and the tooth transmission assembly, the main transmission assembly, the differential transmission assembly, and the lifting transmission assembly, thereby improving the transmission efficiency and cloth feeding stability of the cloth feeding mechanism. At the same time, the present utility model simplifies the structure between the transmission components and reduces the transmission cost. Description of the drawings

[0021] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 It is a schematic assembly structure diagram of the cloth feeding mechanism of a sewing machine in the present utility model;

[0023] Figure 2 It is an exploded view of the structure of the cloth feeding mechanism of a sewing machine in the present utility model;

[0024] Figure 3 It is a schematic structural diagram of the gear transmission assembly in the present utility model;

[0025] Figure 4 It is a schematic structural diagram of the main drive assembly in the present utility model;

[0026] Figure 5 It is a schematic structural diagram of the main gear rack and the differential gear rack in the present utility model.

[0027] Reference numerals: 1, fixed side plate; 2, cloth feeding cylinder; 3, main gear rack; 31, main swing arm; 32, main swing frame; 33, main gear; 4, differential gear rack; 41, differential swing arm; 42, differential swing frame; 43, differential gear; 44, differential pinion; 5, gear transmission assembly; 51, lifting slider; 52, driving slider; 53, main swing member; 54, main transmission shaft; 55, differential swing member; 56, differential transmission shaft; 57, main driving shaft; 58, main cam; 59, differential driving shaft; 510, differential cam; 6, main drive assembly; 61, main drive crankshaft; 62, first swing member; 63, second swing member; 7, differential drive assembly; 8, lifting drive assembly; 81, driving transmission frame; 82, driving connecting rod; 83, third swing member; 9, semi-circular notch; 10, arc outer edge; 11, hook needle assembly; 111, hook needle bracket; 112, lower hook needle. Specific embodiments

[0028] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. The same reference numerals are used for the same components. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component, respectively.

[0029] Example 1, refer to Figures 1 to 3, which is the first embodiment of the present utility model. This embodiment provides a sewing machine feeding mechanism, which can improve the transmission efficiency and feeding stability of the feeding mechanism. It includes a fixed side plate 1, a semi-sleeve-shaped feeding cylinder 2, a driving tooth rack 3, a differential tooth rack 4, a tooth transmission assembly 5, a driving transmission assembly 6, a differential transmission assembly 7, and a lifting transmission assembly 8;

[0030] The feeding cylinder 2 is detachably installed on one side of the fixed side plate 1, and the driving transmission assembly 6, the differential transmission assembly 7, and the lifting transmission assembly 8 are installed on the other side of the fixed side plate 1. The driving tooth rack 3, the differential tooth rack 4, and the tooth transmission assembly 5 are all arranged inside the feeding cylinder 2;

[0031] The driving tooth rack 3 includes an integrally connected driving swing arm 31 and a driving swing frame 32. The driving swing frame 32 is located at the lower end of the driving swing arm 31. The differential tooth rack 4 includes an integrally connected differential swing arm 41 and a differential swing frame 42. The driving swing frame 32 and the differential swing frame 42 slide against each other and have the same shape. Horizontal openings are provided on both sides of the driving swing frame 32 and the differential swing frame 42, and lifting openings are provided in the middle;

[0032] The tooth transmission assembly 5 includes a pair of lifting sliders 51, a pair of driving sliders 52, a driving swing member 53, a driving transmission shaft 54, a differential swing member 55, a differential transmission shaft 56, a driving drive shaft 57, a driving cam 58, a differential drive shaft 59, and a differential cam 510;

[0033] The lifting slider 51 slides up and down in the lifting opening, and the driving slider 52 slides horizontally in the horizontal opening. One end of the driving swing member 53 is rotatably connected to the outer center of one of the lifting sliders 51, and the other end is fixedly connected to the driving transmission shaft 54. The differential transmission shaft 56 is rotatably sleeved outside the driving transmission shaft 54. One end of the differential swing member 55 is rotatably connected to the outer center of the other lifting slider 51, and the other end is fixedly connected to the differential transmission shaft 56. The driving transmission shaft 54 and the differential transmission shaft 56 rotatably penetrate the fixed side plate 1 and are respectively fixedly connected to the driving transmission assembly 6 and the differential transmission assembly 7;

[0034] One end of the driving drive shaft 57 is fixedly connected to the center of the wheel of the driving cam 58, and the other end rotatably penetrates the fixed side plate 1 and is fixedly connected to the lifting transmission assembly 8. One end of the differential drive shaft 59 is fixedly connected to the center of the wheel of the differential cam 510, and the other end rotatably penetrates the fixed side plate 1 and is fixedly connected to the lifting transmission assembly 8. The eccentric ends of the driving cam 58 and the differential cam 510 are respectively rotatably connected to a pair of driving sliders 52.

[0035] Working principle of Embodiment 1:

[0036] In this embodiment, by arranging the driving tooth frame 3, differential tooth frame 4, and tooth transmission assembly 5 inside the cloth feeding cylinder 2, while installing the cloth feeding cylinder 2 on one side of the fixed side plate 1, and installing the driving transmission assembly 6, differential transmission assembly 7, and lifting transmission assembly 8 on the other side of the fixed side plate 1, the torque between the driving tooth frame 3, differential tooth frame 4 and the tooth transmission assembly 5, driving transmission assembly 6, differential transmission assembly 7, and lifting transmission assembly 8 is significantly reduced, thereby improving the transmission efficiency and cloth feeding stability of the cloth feeding mechanism. At the same time, this technical solution simplifies the structure between the transmission components and reduces the transmission cost.

[0037] Preferably, as Figure 4 shown, the driving transmission assembly 6 includes a driving transmission crankshaft 61, a first swinging member 62, and a second swinging member 63. One end of the driving transmission crankshaft 61 facing the fixed side plate 1 is rotatably connected to one end of the first swinging member 62. The other end of the first swinging member 62 is rotatably connected to one end of the second swinging member 63. The other end of the second swinging member 63 is fixedly connected to the driving transmission shaft 54. The end of the driving transmission crankshaft 61 away from the fixed side plate 1 is fixedly connected to a first driving source, and the first driving source is used to drive the driving transmission crankshaft 61 to rotate periodically in the clockwise or counterclockwise direction.

[0038] Specifically, in this embodiment, when the first driving source drives the driving transmission crankshaft 61 to rotate periodically in the clockwise or counterclockwise direction, the first swinging member 62 and the second swinging member 63 are driven to swing in sequence, and then the driving transmission shaft 54 is driven to rotate. The driving transmission shaft 54 drives the driving swing frame 32 to swing horizontally under the limiting action of the driving slider 52, driving the driving swing arm 31 to swing horizontally, realizing the horizontal feeding of the driving tooth frame 3.

[0039] Preferably, the differential transmission assembly 7 includes a driving connecting rod. One end of the driving connecting rod is fixedly connected to a second driving source, and the other end is fixedly connected to the differential transmission shaft 56. The second driving source is used to drive the differential transmission shaft 56 to rotate periodically in the clockwise or counterclockwise direction.

[0040] Specifically, in this embodiment, when the second driving source drives the driving connecting rod to rotate periodically in the clockwise or counterclockwise direction, the differential transmission shaft 56 is driven to rotate. The differential transmission shaft 56 drives the differential swing frame 42 to swing horizontally under the limiting action of the driving slider 52, driving the differential swing arm 41 to swing horizontally, realizing the horizontal feeding of the differential tooth frame 4. Among them, during the driving processes of the first driving source and the second driving source, the driving swing arm 31 and the differential swing arm 41 swing synchronously to achieve synchronous feeding. During the synchronous swinging of the driving swing arm 31 and the differential swing arm 41, a pair of lifting sliders 51 slide up and down in the lifting opening.

[0041] Preferably, the lifting transmission assembly 8 includes a driving transmission frame 81, a driving connecting rod 82 and a third swinging member 83. The lower end of the driving transmission frame 81 is fixedly connected to a third driving source. The two ends of the driving connecting rod 82 are respectively rotatably connected to the upper end of the driving transmission frame 81 and the upper end of the third swinging member 83. The lower end of the third swinging member 83 is fixedly connected to a differential driving shaft 59. The main driving shaft 57 is fixedly inserted into the middle of the driving transmission frame 81. The third driving source is used to drive the driving transmission frame 81 to rotate periodically in the clockwise or counterclockwise direction.

[0042] Specifically, in this embodiment, when the third driving source drives the driving transmission frame 81 to rotate periodically in the clockwise or counterclockwise direction, the driving transmission frame 81 drives the main driving shaft 57 to rotate. At the same time, the driving connecting rod 82 drives the third swing rod to swing, thereby driving the differential driving shaft 59 to rotate. During the rotation of the main driving shaft 57 and the differential driving shaft 59, the main cam 58 and the differential cam 510 both rotate along the wheel center, thereby driving a pair of driving sliders 52 to adjust the height in the vertical direction. Therefore, in this embodiment, when the first driving source, the second driving source and the third driving source are synchronously driven, the positions of the main swing arm 31 and the differential swing arm 41 in the horizontal and vertical directions will change, thereby realizing the front-back, up-down movement of the main gear 33 and the driven gear in the feeding cylinder 2, and completing the feeding.

[0043] Preferably, copper bushings are rotatably sleeved outside the differential driving shaft 59, the main driving shaft 57 and the differential transmission shaft 56.

[0044] Specifically, in this embodiment, by rotatably sleeving copper bushings outside the main driving shaft 57 and the differential transmission shaft 56, the vibration and noise generated during the rotation of the main driving shaft 57 and the differential transmission shaft 56 can be significantly reduced. At the same time, the corrosion resistance of the main driving shaft 57 and the differential transmission shaft 56 can be improved, and the service life can be extended.

[0045] Embodiment 2 is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a hook needle movement port, which can avoid movement interference and improve the integration of the hook needle assembly 11 in the feeding cylinder 2. Among them, a semicircular notch 9 is provided at the upper end of the fixed side plate 1. The middle part of the driving connecting rod 82 is bent upward to form an arc-shaped bending part. A hook needle movement port is formed between the semicircular notch 9 and the arc-shaped bending part. The hook needle assembly 11 passes through the hook needle movement port and extends into the feeding cylinder 2. The hook needle assembly 11 includes a hook needle bracket 111 and a lower hook needle 112. The hook needle 112 is detachably connected to the front end of the hook needle bracket 111. The rear end of the hook needle bracket 111 is located in the hook needle movement port. The rear end of the hook needle bracket 111 is fixedly connected to a horizontal driving source, and the horizontal driving source is used to drive the hook needle bracket 111 to perform horizontal telescopic movement.

[0046] The working principle of Embodiment 2:

[0047] When the horizontal drive source drives the crochet hook support 111 to perform horizontal telescopic movement, the crochet hook support 111 reciprocates telescopically within the crochet hook movement opening. This method can not only avoid interference between the horizontal telescopic movement of the crochet hook support 111 and the swing of the drive connecting rod 82, but also limit the movement process of the crochet hook support 111 inside the fabric feeding cylinder 2, improving the integration degree of the crochet hook assembly 11 inside the fabric feeding cylinder 2. Among them, the lower crochet hook 112 is bolted to the crochet hook support 111. This method is not only convenient for installation and disassembly, but also has high connection stability.

[0048] Preferably, as Figure 5 shown, the upper end of the active swing arm 31 is detachably connected to the active gear 33, the upper end of the differential swing arm 41 is detachably connected to the differential gear 43, the side end of the differential gear 43 is detachably connected to the differential pinion 44, and a needle plate is detachably installed on the fabric feeding cylinder 2. A number of tooth holes are provided on the needle plate, and the active gear 33, the differential gear 43, and the differential pinion 44 move within the tooth holes.

[0049] Specifically, in this embodiment, the upper end of the active swing arm 31 is provided with an active installation groove, and the installation part of the active gear 33 is installed on the active installation groove through bolts. The upper end of the differential swing arm 41 is provided with a differential installation groove, and the installation part of the differential gear 43 is installed on the differential installation groove through bolts. The differential gear 43 is also provided with a differential sub-installation groove, and the differential pinion 44 is installed on the differential sub-installation groove through bolts, facilitating disassembly and installation when the active gear 33, the differential gear 43, and the differential pinion 44 fail.

[0050] Embodiment 3 is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides an arc-shaped outer edge 10, which can facilitate the installation and disassembly of the fabric feeding cylinder 2 and the fixed side plate 1. An arc-shaped outer edge 10 is provided at the place where the fabric feeding cylinder 2 and the fixed side plate 1 are in contact and abutted. A number of first screw holes are provided on the arc-shaped outer edge 10, and a number of second screw holes are provided on the fixed side plate 1. The positions of the first screw holes and the second screw holes correspond to each other, and a tightening bolt is threadedly connected between the first screw hole and the second screw hole.

[0051] The working principle of Embodiment 3:

[0052] When the fabric feeding cylinder 2 and the fixed side plate 1 need to be installed, align the first screw holes on the arc-shaped outer edge 10 with the second screw holes on the fixed side plate 1, and then thread the tightening bolts into the first screw holes and the second screw holes in sequence to complete the installation.

[0053] Preferably, the circumference of the fabric feeding end of the fabric feeding cylinder 2 is 116 mm.

[0054] Specifically, in this embodiment, the feeding end of the feeding cylinder 2 only has the ends of the driving gear 33, the differential gear 43, the differential pinion 44, the driving swing arm 31 and the differential swing arm 41. Therefore, the circumference of the feeding end of the feeding cylinder 2 can be made smaller, which is applicable to the sewing of tubular fabrics of more sizes.

[0055] The above is only the preferred embodiment of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the idea of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and retouches should also be regarded as the protection scope of the present utility model.

Claims

1. A feeding mechanism for a sewing machine, characterized in that, It includes a fixed side plate (1), a semi-sleeve-shaped cloth feeding cylinder (2), a driving tooth frame (3), a differential tooth frame (4), a tooth transmission assembly (5), a driving transmission assembly (6), a differential transmission assembly (7) and a lifting transmission assembly (8); The cloth feeding cylinder (2) is detachably mounted on one side of the fixed side plate (1), the driving transmission assembly (6), the differential transmission assembly (7) and the lifting transmission assembly (8) are mounted on the other side of the fixed side plate (1), and the driving tooth frame (3), the differential tooth frame (4) and the tooth transmission assembly (5) are all arranged inside the cloth feeding cylinder (2); The driving tooth frame (3) includes a driving swing arm (31) and a driving swing frame (32) which are integrally connected. The driving swing frame (32) is located at the lower end of the driving swing arm (31). The differential tooth frame (4) includes a differential swing arm (41) and a differential swing frame (42) which are integrally connected. The driving swing frame (32) and the differential swing frame (42) are slidably abutted against each other and have the same shape. Horizontal openings are provided on both sides of the driving swing frame (32) and the differential swing frame (42), and a lifting opening is provided in the middle; The tooth transmission assembly (5) includes a pair of lifting sliders (51), a pair of driving sliders (52), a driving swing member (53), a driving transmission shaft (54), a differential swing member (55), a differential transmission shaft (56), a driving drive shaft (57), a driving cam (58), a differential drive shaft (59) and a differential cam (510); The lifting slider (51) is lifted and slid in the lifting opening, the driving slider (52) is horizontally slid in the horizontal opening. One end of the driving swing member (53) is rotatably connected to the outer center of one of the lifting sliders (51), and the other end is fixedly connected to the driving transmission shaft (54). The differential transmission shaft (56) is rotatably sleeved outside the driving transmission shaft (54). One end of the differential swing member (55) is rotatably connected to the outer center of the other lifting slider (51), and the other end is fixedly connected to the differential transmission shaft (56). The driving transmission shaft (54) and the differential transmission shaft (56) rotatably penetrate through the fixed side plate (1) and are respectively fixedly connected to the driving transmission assembly (6) and the differential transmission assembly (7); One end of the driving drive shaft (57) is fixedly connected to the center of the wheel of the driving cam (58), and the other end rotatably penetrates through the fixed side plate (1) and is fixedly connected to the lifting transmission assembly (8). One end of the differential drive shaft (59) is fixedly connected to the center of the wheel of the differential cam (510), and the other end rotatably penetrates through the fixed side plate (1) and is fixedly connected to the lifting transmission assembly (8). The eccentric ends of the driving cam (58) and the differential cam (510) are respectively rotatably connected to a pair of the driving sliders (52).

2. The sewing machine feed mechanism according to claim 1, characterized in that: The active transmission assembly (6) includes an active transmission crankshaft (61), a first swing member (62) and a second swing member (63). One end of the active transmission crankshaft (61) facing the fixed side plate (1) is rotatably connected to one end of the first swing member (62). The other end of the first swing member (62) is rotatably connected to one end of the second swing member (63). The other end of the second swing member (63) is fixedly connected to the active transmission shaft (54). One end of the active transmission crankshaft (61) away from the fixed side plate (1) is fixedly connected to a first driving source, and the first driving source is used to drive the active transmission crankshaft (61) to rotate periodically in the clockwise or counterclockwise direction.

3. The sewing machine feed mechanism according to claim 2, wherein: The differential transmission assembly (7) includes a driving connecting rod. One end of the driving connecting rod is fixedly connected to a second driving source, and the other end is fixedly connected to the differential transmission shaft (56). The second driving source is used to drive the differential transmission shaft (56) to rotate periodically in the clockwise or counterclockwise direction.

4. The sewing machine feed mechanism according to claim 1, characterized in that: Copper bushings are rotatably sleeved outside the differential drive shaft (59), the active drive shaft (57) and the differential transmission shaft (56).

5. The sewing machine feed mechanism according to claim 1, wherein: The lifting transmission assembly (8) includes a driving transmission frame (81), a driving connecting rod (82) and a third swing member (83). The lower end of the driving transmission frame (81) is fixedly connected to a third driving source. The two ends of the driving connecting rod (82) are respectively rotatably connected to the upper end of the driving transmission frame (81) and the upper end of the third swing member (83). The lower end of the third swing member (83) is fixedly connected to the differential drive shaft (59). The active drive shaft (57) is fixedly inserted in the middle of the driving transmission frame (81). The third driving source is used to drive the driving transmission frame (81) to rotate periodically in the clockwise or counterclockwise direction.

6. The sewing machine feed mechanism according to claim 5, characterized in that: It further includes a hook needle assembly (11). A semicircular notch (9) is provided at the upper end of the fixed side plate (1). The middle part of the driving connecting rod (82) bends upward to form an arc-shaped bending part. A hook needle movement opening is formed between the semicircular notch (9) and the arc-shaped bending part. The hook needle assembly (11) passes through the hook needle movement opening and extends into the cloth feeding cylinder (2). The hook needle assembly (11) includes a hook needle bracket (111) and a lower hook needle (112). The front end of the hook needle bracket (111) is detachably connected to the hook needle bracket (111). The rear end of the hook needle bracket (111) is located in the hook needle movement opening. The rear end of the hook needle bracket (111) is fixedly connected to a horizontal driving source, and the horizontal driving source is used to drive the hook needle bracket (111) to perform horizontal telescopic movement.

7. The sewing machine feed mechanism according to claim 1, wherein: The upper end of the active swing arm (31) is detachably connected to an active gear (33). The upper end of the differential swing arm (41) is detachably connected to a differential gear (43). The side end of the differential gear (43) is detachably connected to a differential pinion (44). A needle plate is detachably installed on the cloth feeding cylinder (2), and a plurality of tooth holes are formed in the needle plate. The active gear (33), the differential gear (43) and the differential pinion (44) move in the tooth holes.

8. The sewing machine feeding mechanism according to claim 1, wherein: An arc-shaped outer edge (10) is provided at the place where the cloth feeding cylinder (2) abuts against the fixed side plate (1). A plurality of first screw holes are formed in the arc-shaped outer edge (10), and a plurality of second screw holes are formed in the fixed side plate (1). The positions of the first screw holes and the second screw holes correspond to each other, and a tightening bolt is threadedly connected between the first screw hole and the second screw hole.

9. The sewing machine feed mechanism according to claim 1, characterized in that: The circumference of the cloth feeding end of the cloth feeding cylinder is 116 mm.

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