Lockstitch bartacking machine transmission mechanism and lockstitch bartacking machine thereof

Abstract

The transmission mechanism comprises an upper shaft assembly, a lower shaft assembly and a transmission connecting rod, the upper shaft assembly comprises a first machine shaft, a second machine shaft and a third machine shaft, the first machine shaft and the second machine shaft are coaxially arranged, and the third machine shaft is eccentrically arranged between the first machine shaft and the second machine shaft. The two fixing bases are installed on the first crankshaft and the second crankshaft respectively, the two pressing plates are installed on the two fixing bases respectively to form two arc half holes, the two ends of the third crankshaft are provided with two arc half shafts connected into the two arc half holes in a matched mode, and the arc half shafts are wrapped and pressed tightly when the fixing bases and the pressing plates are fastened. In this way, the third crankshaft is fixedly connected with the first crankshaft and the second crankshaft, the self-rotation phenomenon of the third crankshaft in the stress transmission process can be prevented through limiting fit formed between the arc half shaft and the arc half hole, the transmission synchronism and reliability of the upper shaft assembly are guaranteed, the installation stability is good, and the use performance of products is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of flat sewing machines, and particularly relates to a transmission mechanism of a flat sewing bartack machine and the flat sewing bartack machine. Background Art

[0002] The flat sewing bartack machine is a supporting device for automatic knotting. When performing flat sewing for packaging, the flat sewing bartack machine is required to perform knotting operations to facilitate better use of the packaging, and it can sew fabrics such as cotton, linen, silk, wool, and artificial fibers, as well as products such as leather, plastic, and paper.

[0003] The transmission mechanism part of the flat sewing bartack machine mainly includes a servo motor, a connecting rod, an upper shaft, and a lower shaft. The servo motor drives the upper shaft to rotate in a circle. The upper shaft drives the connecting rod to move up and down through its eccentric structure. The connecting rod drives the lower shaft to rotate through a swing gear assembly. The existing upper shaft is a combined machine shaft structure. This combined machine shaft structure is composed of a first machine shaft, a second machine shaft, and a third machine shaft connected in three sections to form an eccentric structure. The connecting rod is sleeved on the third machine shaft through a bearing. Two circular shafts are provided at both ends of the third machine shaft. The two circular shafts are respectively fixed on the third machine shaft and the third machine shaft through screws and two fixing brackets. Circular holes for cooperating with the circular shafts are formed between the first machine shaft and the second machine shaft and the two fixing brackets respectively. According to the two circular shafts of the third machine shaft, they are fastened in the circular holes through screws. However, when the circular shafts of the third machine shaft are subjected to a large torque, they are prone to self-rotation in the circular holes, affecting the transmission synchronism between the first machine shaft, the second machine shaft, and the third machine shaft, and the installation stability is poor, thereby affecting the product use performance. Summary of the Utility Model

[0004] Therefore, the purpose of the present utility model is to overcome the deficiencies existing in the prior art, so as to provide a transmission mechanism of a flat sewing bartack machine and the flat sewing bartack machine that can prevent the third machine shaft from self-rotating, has good installation stability, ensures the synchronism and reliability of the transmission of the upper shaft assembly, and improves the product use performance.

[0005] To achieve the above-mentioned purpose, the utility model provides a transmission mechanism of a lockstitch tacking machine, comprising an upper shaft assembly and a lower shaft assembly which are arranged in a casing up and down, and a transmission connecting rod connected between the upper shaft assembly and the lower shaft assembly, the upper shaft assembly is arranged in linkage with a driving motor, the upper shaft assembly comprises a first machine shaft and a second machine shaft which are arranged coaxially, and a third machine shaft which is eccentrically arranged between the first machine shaft and the second machine shaft, the transmission connecting rod is sleeved on the second machine shaft, the first machine shaft and the second machine shaft are fixedly connected to the third machine shaft through a mounting structure, the mounting structure comprises: two fixing seats which are respectively fixed to the first machine shaft and the second machine shaft, and two pressing plates which are fixedly connected to the two fixing seats to form two arc half holes, two arc half shafts which are matched and connected to the two arc half holes and form a limit fit are arranged at both ends of the third machine shaft, and the fixing seat and the pressing plate wrap and press the arc half shafts tightly when they are fixed.

[0006] In the above-mentioned transmission mechanism of the flat-seam bar-tacking machine, at least one positioning plane for mating contact is provided between the circular arc semi-axis and the circular arc semi-hole.

[0007] In the above-mentioned flat-seam tacking machine transmission mechanism, the arc half hole includes an arc groove arranged on the pressure plate, and a concave groove arranged on the bottom of the fixed seat and opposite to the arc groove, and the arc half shaft includes an arc portion cooperated with the arc groove, and a plane portion cooperated with the concave groove, and a positioning plane is formed between the plane portion and the bottom surface of the concave groove.

[0008] In the above-mentioned transmission mechanism of the flat-seam bartacking machine, two fixing seats are provided with through holes which are sleeved on the first machine shaft and the second machine shaft, and the pressing plate and the fixing seats are fixedly connected by a screw structure.

[0009] In the above-mentioned lockstitch tacking machine transmission mechanism, the first machine shaft, the third machine shaft and the second machine shaft are connected in sequence to form an eccentric structure, the first machine shaft is connected to the output shaft of the motor, and the upper end of the transmission connecting rod is provided with a first bearing sleeved on the third machine shaft, and the two sides of the first bearing are restricted by two fixed seats, and when the upper shaft assembly rotates, the transmission connecting rod is driven to reciprocate up and down.

[0010] In the above-mentioned lockstitch bartacking machine transmission mechanism, the lower shaft assembly includes a lower shaft, a gear assembly and a connecting shaft which are sequentially connected and arranged on the housing, the connecting shaft is a Z-shaped shaft structure and has a first shaft end connected to the lower end of the transmission connecting rod, and a second shaft end rotatably arranged on the housing through a fixed bearing; the gear assembly includes a driving gear linked to the second shaft end, and a driven gear linked to the lower shaft and meshing with the driving gear.

[0011] In the above-mentioned drive mechanism of the flat-seam overlock sewing machine, the lower shaft is arranged in parallel with the first shaft end and the second shaft end respectively. Two opposite lower shaft fixed bearings are sleeved on the second shaft end, and the two lower shaft fixed bearings are respectively fixedly installed in the machine housing. The drive gear is arranged between the two lower shaft fixed bearings.

[0012] In the above-mentioned drive mechanism of the flat-seam overlock sewing machine, the lower end of the transmission connecting rod is provided with a second bearing, and is sleeved on the first shaft end of the connecting shaft through the second bearing.

[0013] In the above-mentioned drive mechanism of the flat-seam overlock sewing machine, a limiting structure for restricting the connecting shaft from disengaging from the second bearing is arranged between the transmission connecting rod and the connecting shaft. The limiting structure includes a limiting baffle arranged on the side surface of the lower end of the transmission connecting rod and opposite to the first shaft end, and a locking member passing through the limiting baffle and fixedly connected to the first shaft end.

[0014] The present utility model also provides a flat-seam overlock sewing machine, which includes a machine housing and the drive mechanism of the flat-seam overlock sewing machine described in any one of the above.

[0015] The technical solution of the present utility model has the following advantages compared with the prior art:

[0016] 1. In the drive mechanism of the flat-seam overlock sewing machine provided by the present utility model, two arc half shafts are arranged at both ends of the third machine shaft. During installation, two fixing seats are respectively oppositely installed on the first machine shaft and the second machine shaft, and then two pressing plates are respectively installed on the two fixing seats to form two arc half holes that cooperate with the two arc half shafts. When the fixing seats and the pressing plates are tightened, the arc half shafts are wrapped and pressed in the arc half holes. Such an installation design realizes the fixed connection of the third machine shaft with the first machine shaft and the second machine shaft. The limiting fit formed between the arc half shafts and the arc half holes can prevent the third machine shaft from rotating automatically during the force transmission process, playing a role in limiting installation, thereby ensuring the synchronization and reliability of the transmission between the first machine shaft, the third machine shaft and the second machine shaft, and having good installation stability. This upper shaft assembly is composed of the first machine shaft, the second machine shaft and the third machine shaft connected to form an eccentric structure for connecting the transmission connecting rod. The transmission connecting rod transmits motion and force between the upper shaft assembly and the lower shaft assembly, improving the product use performance.

[0017] 2. In the drive mechanism of the flat-seam overlock sewing machine provided by the present utility model, both ends of the third machine shaft are designed as half shaft structures. Correspondingly, a concave groove is provided at the bottom of the fixing seat, and an arc groove is provided on the pressing plate. The flat part of this arc half shaft is matched and connected in the concave groove, and its arc part is matched and connected in the arc groove. The flat part is in plane contact with the bottom plane of the concave groove, thereby playing a role in limiting the arc half shaft in the arc half hole between the fixing seat and the pressing plate to prevent the third machine shaft from rotating automatically relative to the first machine shaft and the second machine shaft, thus ensuring the reliability and stability of the linkage between multiple machine shafts.

[0018] 3. In the transmission mechanism of the flat-seam bartack sewing machine provided by the present utility model, a limit baffle opposite to the first shaft end is provided on the lower side surface of the transmission connecting rod, and a locking member passes through the limit baffle and is fixedly connected to the first shaft end. The locking member is preferably a screw structure, and a screw hole structure is provided corresponding to the first shaft end. With this structural arrangement, a fixed fit is formed between the locking member and the first shaft end, which can prevent the connecting shaft from disengaging from the second bearing and ensure the reliable connection between the connecting shaft and the transmission connecting rod.

[0019] 4. In the transmission mechanism of the flat-seam bartack sewing machine provided by the present utility model, this connecting shaft is designed as a Z-shaped structure and has a first shaft end connected to the lower end of the transmission connecting rod and a second shaft end rotatably connected to a fixed bearing. The second shaft end is connected to the lower shaft through a gear assembly. When the upper shaft assembly drives the transmission connecting rod to make reciprocating up and down movements through its eccentric structure, the connecting shaft is driven by the transmission connecting rod to rotate. The connecting shaft drives the lower shaft to rotate by meshing a driving gear with a driven gear. Through the connecting shaft, the reciprocating movement of the transmission connecting rod can be converted into the rotational movement of the lower shaft. This connecting rod transmission method can meet the transmission requirements of different speeds and torques between the upper shaft and the lower shaft, has a large load-bearing capacity, high transmission efficiency, and improves the stability and reliability of the use of the transmission mechanism of the flat-seam bartack sewing machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art.

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the transmission mechanism of the flat-seam bartack sewing machine provided by the present utility model;

[0022] Figure 2 It is a sectional structural schematic diagram of the upper shaft assembly of the present utility model;

[0023] Figure 3 It is a sectional structural schematic diagram of the lower shaft assembly of the present utility model;

[0024] Figure 4 It is a split structural schematic diagram of the upper shaft assembly of the present utility model;

[0025] Figure 5 It is a sectional structural schematic diagram of the lower shaft assembly of the present utility model;

[0026] Figure 6 It is a structural schematic diagram of the flat-seam bartack sewing machine provided by the present utility model.

[0027] Description of reference numerals: a, upper shaft assembly; b, lower shaft assembly; 1, first machine shaft; 2, second machine shaft; 3, third machine shaft; 31, arc half shaft; 311, arc part; 312, flat part; 4, fixed seat; 41, concave groove; 42, through hole; 5, pressing plate; 51, arc groove; 6, transmission connecting rod; 61, first bearing; 62, second bearing; 63, limit baffle; 64, locking part; 7, connecting shaft; 71, first shaft end; 72, second shaft end; 73, driving gear; 8, lower shaft; 81, driven gear; 9, motor; 10, machine housing; 101, lower shaft fixed bearing; 102, upper shaft fixed bearing. Detailed implementation manners

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0029] In the description of the present utility model, it should be noted that the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0030] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0031] Embodiment 1

[0032] This embodiment provides as Figure 1-6The transmission mechanism of a flat-seam tacking machine shown in the figure includes an upper shaft assembly a and a lower shaft assembly b which are arranged in a casing 10 from top to bottom, and a transmission connecting rod 6 connected between the upper shaft assembly a and the lower shaft assembly b. The upper shaft assembly a is arranged in linkage with a driving motor 9. The upper shaft assembly a includes a first machine shaft 1 and a second machine shaft 2 which are arranged coaxially, and a third machine shaft 3 which is eccentrically arranged between the first machine shaft 1 and the second machine shaft 2. The transmission connecting rod 6 is sleeved on the second machine shaft 2, and is characterized in that the first machine shaft 1 and the second machine shaft 2 are fixedly connected to the third machine shaft 3 through a mounting structure, and the mounting structure includes: two fixing seats 4 which are respectively fixed on the first machine shaft 1 and the second machine shaft 2, and two pressing plates 5 which are fixedly connected to the two fixing seats 4 to form two arc half holes. Two arc half shafts 31 which are matched and connected in the two arc half holes and form a limit fit are provided at both ends of the third machine shaft 3. When the fixing seat 4 and the pressing plate 5 are tightened, the arc half shaft 31 is wrapped and pressed.

[0033] The above implementation is the core technical solution of this embodiment. By arranging two arc half shafts 31 at both ends of the third machine shaft 3, during installation, the two fixing seats 4 are respectively installed on the first machine shaft 1 and the second machine shaft 2, and then the two pressing plates 5 are respectively installed on the two fixing seats 4 to form two arc half holes that are matched and connected with the two arc half shafts 31. When the fixing seats 4 and the pressing plates 5 are fastened, the arc half shafts 31 are wrapped and pressed in the arc half holes. In this way, the installation design realizes the fixed connection between the third machine shaft 3 and the first machine shaft 1 and the second machine shaft 2. The limiting cooperation formed between the arc half-shaft 31 and the arc half-hole can prevent the third machine shaft 3 from self-rotating during the force transmission process, and play a role in limiting installation, thereby ensuring the synchronization and reliability of transmission between the first machine shaft 1, the third machine shaft 3 and the second machine shaft 2, and having good installation stability. The upper shaft assembly is composed of the first machine shaft 1, the second machine shaft 2 and the third machine shaft 3 connected to form an eccentric structure for connecting the transmission connecting rod 6, and the motion and force are transmitted between the upper shaft assembly and the lower shaft assembly through the transmission connecting rod 6, thereby improving the product performance.

[0034] Combine the following Figure 1-4 Detailed description of the specific setting method of the upper shaft assembly:

[0035] There is at least one positioning plane in contact fit between the arc semi-axis 31 and the arc semi-hole. Further preferably, the arc semi-hole includes an arc groove 51 provided on the pressing plate 5 and a concave groove 41 provided at the bottom of the fixed seat 4 and opposite to the arc groove. The arc semi-axis includes an arc portion 311 that fits and connects with the arc groove 51 and a plane portion 312 that fits and connects with the concave groove 41. The positioning plane is formed between the plane portion and the bottom plane of the concave groove, so that the plane portion 312 and the bottom plane of the concave groove 41 form a positioning contact. The advantage of this design is that the two ends of the third machine shaft 3 are designed as an arc semi-axis structure. The plane portion of the arc semi-axis 31 is matched and connected in the concave groove 41, and its arc portion is matched and connected in the arc groove 51. The plane portion 312 and the bottom plane of the concave groove 41 are in plane contact, so as to limit the arc semi-axis 31 in the arc semi-hole between the fixed seat 4 and the pressing plate 5, preventing the third machine shaft from rotating by itself between the first machine shaft and the second machine shaft, thereby ensuring the reliability and stability of the linkage between multiple machine shafts.

[0036] As Figure 4 shown, the two fixed seats 4 are provided with through holes 42 sleeving the first machine shaft 1 and the second machine shaft 2. The pressing plate 5 and the fixed seat 4 are fixedly connected by a screw structure. The fixed seat 4 and the pressing plate 5 cooperate to press the arc semi-axis 31 under the tightening action of the screw structure, thereby realizing the fixed connection between the third machine shaft 3 and the first machine shaft 1 and the second machine shaft 2. Among them, the first machine shaft 1, the third machine shaft 3 and the second machine shaft 2 are connected in sequence to form an eccentric structure. The first machine shaft 1 is connected to the output shaft of the motor 9. The upper end of the transmission connecting rod 6 is provided with a first bearing 61 sleeving the third machine shaft 3. Both sides of the first bearing 61 are limited by the two fixed seats 4. When the upper shaft assembly a rotates, it drives the transmission connecting rod 6 to move up and down reciprocally. The fixed seat 4 plays a role in limiting the transmission connecting rod 6 sleeving the third machine shaft 3 to prevent the transmission connecting rod 6 from axially shifting on the third machine shaft.

[0037] The following combines Figure 1 、 Figure 3-5 to make a detailed description of the specific setting method of the lower shaft assembly:

[0038] The lower shaft assembly b includes a lower shaft 8, a gear assembly and a connecting shaft 7 which are sequentially connected and arranged on the housing 10. The connecting shaft 7 is a Z-shaped shaft structure and has a first shaft end 71 connected to the lower end of the transmission connecting rod 6, and a second shaft end 72 rotatably arranged on the housing 10 through a fixed bearing, wherein the gear assembly includes a driving gear 73 linked to the second shaft end 72, and a driven gear 81 linked to the lower shaft 8 and meshing with the driving gear 73. The lower shaft 8 is respectively arranged in parallel with the first shaft end 71 and the second shaft end 72, and the transmission cooperation between the connecting shaft 7 and the main shaft is realized by gear transmission. Two opposite lower shaft fixed bearings 101 are sleeved on the second shaft end 72, and the two lower shaft fixed bearings 101 are respectively fixedly installed on the housing 10 In the embodiment, the second shaft end 72 can be rotatably passed through the two lower shaft fixed bearings, and the connecting shaft 7 is supported by the two lower shaft fixed bearings. The driving gear 73 is arranged between the two fixed bearings. Similarly, the casing 10 is provided with a plurality of upper shaft fixed bearings 102 sleeved on the first shaft 1 and the second shaft 2. The upper shaft assembly a is supported by the upper shaft fixed bearings 102 in the casing 10. The lower end of the transmission connecting rod 6 is provided with a second bearing 62, and the second bearing 62 is sleeved on the first shaft end 71 of the connecting shaft 7. The two ends of the transmission connecting rod 6 are respectively provided with bearing holes for installing the first bearing 61 and the second bearing 62. The first bearing and the second bearing can be selected from ball bearings or needle bearings. With this structural arrangement, when the upper shaft assembly a drives the transmission connecting rod 6 to make up and down reciprocating motion through its eccentric structure, the transmission connecting rod 6 drives the connecting shaft 7 to realize reciprocating rotation, and the connecting shaft 7 engages with the driven gear 81 through the driving gear 73 to drive the lower shaft 8 to realize rotation, so that the reciprocating motion of the transmission connecting rod 6 can be converted into the rotation of the lower shaft 8 through the connecting shaft 7. The driving gear is a half-gear structure. This connecting rod transmission method can meet the transmission requirements of different speeds and torques between the upper shaft and the lower shaft, has a large load-bearing capacity and high transmission efficiency, and improves the stability and reliability of the use of the transmission mechanism of the flat-seam tacking machine.

[0039] like Figure 3 As shown, a limiting structure for limiting the connection shaft 7 from being separated from the second bearing 62 is provided between the transmission connecting rod 6 and the connecting shaft 7. The limiting structure is provided on a limiting baffle 63 which is arranged on the lower end side of the transmission connecting rod 6 and is opposite to the first shaft end 71, and a locking member 64 which passes through the limiting baffle 63 and is fixedly connected to the first shaft end 71. The locking member 64 is preferably a screw structure, and a corresponding screw hole structure is provided on the first shaft end 71. This structural arrangement can prevent the connection shaft 7 from being separated from the second bearing 62 by forming a fixed fit with the first shaft end 71 through the locking member 64, thereby ensuring that the connection shaft 7 and the transmission connecting rod 6 are reliably connected together and the matching transmission is reliable.

[0040] Embodiment 2

[0041] This embodiment provides a flat-seam overlock sewing machine as shown in Figure 1 and Figure 6 , which includes a machine shell 10 and the flat-seam overlock sewing machine transmission mechanism described in Embodiment 1. An upper shaft cavity suitable for installing the upper shaft assembly a and a lower shaft cavity suitable for installing the lower shaft assembly b are provided in the machine shell 10. The flat-seam overlock sewing machine in the above-described embodiment is provided with the flat-seam overlock sewing machine transmission mechanism as described above, and thus naturally has all the advantages brought about by the setting of the above flat-seam overlock sewing machine transmission mechanism. This flat-seam overlock sewing machine drives the upper shaft to rotate through a motor, and then transmits the power to the lower shaft, the feed shaft and the lifter shaft through a link mechanism to realize the flat-seam knotting process for products such as fabrics.

[0042] Obviously, the above embodiments are merely examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or variations can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or variations derived therefrom are still within the protection scope of the present invention.

Claims

1. A transmission mechanism for a lockstitch bartacking machine, comprising an upper shaft assembly (a) and a lower shaft assembly (b) arranged in a housing (10) from top to bottom, and a transmission connecting rod (6) connected between the upper shaft assembly (a) and the lower shaft assembly (b), wherein the upper shaft assembly (a) is arranged in linkage with a driving motor (9), the upper shaft assembly comprises a first shaft (1) and a second shaft (2) arranged coaxially, and a third shaft (3) eccentrically arranged between the first shaft (1) and the second shaft (2), the transmission connecting rod (6) is sleeved on the second shaft (2), and is characterized in that: The first machine shaft (1) and the second machine shaft (2) are fixedly connected to the third machine shaft (3) via a mounting structure, wherein the mounting structure comprises: two fixing seats (4) fixedly fixed to the first machine shaft (1) and the second machine shaft (2) respectively, and two pressing plates (5) fixedly connected to the two fixing seats (4) to form two arc half holes, two arc half shafts (31) matchingly connected to the two arc half holes and forming a limit fit are provided at both ends of the third machine shaft (3), and when the fixing seats (4) and the pressing plates (5) are tightened, the arc half shafts (31) are wrapped and pressed.

2. A lockstitch bartacking machine transmission mechanism according to claim 1, characterized in that: At least one positioning plane for matching contact is provided between the circular arc semi-axis (31) and the circular arc semi-hole.

3. A lockstitch bartacking machine transmission mechanism according to claim 2, characterized in that: The arc half hole comprises an arc groove arranged on the pressure plate (5), and a concave groove (41) arranged on the bottom of the fixing seat (4) and opposite to the arc groove; the arc half shaft comprises an arc portion (311) matched with the arc groove, and a plane portion (312) matched with the concave groove; the plane portion (312) forms a positioning contact with the bottom plane of the concave groove (41).

4. A lockstitch bartacking machine transmission mechanism according to claim 3, characterized in that: The two fixing seats (4) are provided with through holes (42) sleeved on the first machine shaft (1) and the second machine shaft (2), and the pressing plate (5) and the fixing seats (4) are fixedly connected via a screw structure.

5. A lockstitch bartacking machine transmission mechanism according to any one of claims 1 to 4, characterized in that: The first machine shaft (1), the third machine shaft (3) and the second machine shaft (2) are connected in sequence to form an eccentric structure. The first machine shaft (1) is connected to the output shaft of the motor (9). The upper end of the transmission connecting rod (6) is provided with a first bearing (61) sleeved on the third machine shaft (3). Both sides of the first bearing (61) are restricted by two fixed seats (4). When the upper shaft assembly (a) rotates, the transmission connecting rod (6) is driven to perform up and down reciprocating motion.

6. The transmission mechanism of a lockstitch bartacking machine according to claim 1, characterized in that: The lower shaft assembly (b) comprises a lower shaft (8) which is sequentially connected to the housing (10), a gear assembly and a connecting shaft (7); the connecting shaft (7) is a Z-shaped shaft structure and has a first shaft end (71) connected to the lower end of the transmission connecting rod (6), and a second shaft end (72) which is rotatably arranged on the housing (10) via a fixed bearing; the gear assembly comprises a driving gear (73) which is linked to the second shaft end (72), and a driven gear (81) which is linked to the lower shaft (8) and meshes with the driving gear (73).

7. A lockstitch bartacking machine transmission mechanism according to claim 6, characterized in that: The lower shaft (8) is respectively arranged in parallel with the first shaft end (71) and the second shaft end (72); the second shaft end (72) is sleeved with two opposite lower shaft (8) fixed bearings; the two lower shaft (8) fixed bearings are respectively fixedly installed in the housing (10); and the driving gear (73) is arranged between the two fixed bearings.

8. A lockstitch bartacking machine transmission mechanism according to claim 7, characterized in that: The lower end of the transmission connecting rod (6) is provided with a second bearing (62), and is sleeved on the first shaft end (71) of the connecting shaft (7) through the second bearing (62).

9. A lockstitch bartacking machine transmission mechanism according to claim 8, characterized in that: A limiting structure for limiting the connection shaft (7) from being separated from the second bearing (62) is provided between the transmission connecting rod (6) and the connection shaft (7); the limiting structure includes a limiting baffle (63) provided on the lower end side of the transmission connecting rod (6) and opposite to the first shaft end (71), and a locking member (64) passing through the limiting baffle (63) and fixedly connected to the first shaft end (71).

10. A lockstitch bartacking machine, characterized in that: It comprises a casing (10) and a lockstitch bartacking machine transmission mechanism as claimed in any one of claims 1 to 9.

Images