Sewing transmission system of horizontal box covering machine

Abstract

A sewing transmission system of a horizontal box covering machine comprises a crank connecting rod transmission mechanism which comprises a driving connecting rod linked with a machine head, a driving gear and a driven gear piece; the transmission base is in transmission connection with the driving gear; the driving shaft assembly comprises a front driving shaft and a rear driving shaft, and the rear driving shaft is in transmission connection with the driven gear piece; the swinging transmission shaft assembly comprises a front swinging transmission shaft and a rear swinging transmission shaft; the power transmission assembly comprises an input gear, a synchronous belt and an output gear, and the synchronous belt and the front driving shaft are in a vertical state; the shuttle hooking unit comprises a shuttle supporting shaft which is in transmission connection with the output gear; the swing feeding assembly comprises a swing connecting rod, a feeding swing shaft, a swing seat and a feeding tooth, wherein the swing seat and the feeding tooth are in linkage with the shuttle support shaft. The device has the advantages that by optimizing the structure, stable power distribution transmission is achieved through gear-connecting rod composite transmission and power shaft segmented connection, L-shaped power transmission is achieved through the vertically-arranged synchronous belt, and the sewing efficiency and reliability of the bag thick material are improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of bag sewing equipment, specifically relating to a sewing transmission system for a horizontal bag sewing machine. Background Technology

[0002] Currently, horizontal industrial flatbed sewing machines are widely used in the bag sewing industry. Their core mechanism is a straight-arm support arm structure. Specifically, this structure uses a horizontally positioned support arm in conjunction with the sewing table, utilizing the fit between the needle plate and the shaft cavity to hold the fabric in place and complete the bag sewing. However, the straight-arm support structure has the following problems: when the bag is placed on the straight arm, the side to be sewn sags due to gravity, forming a non-horizontal angle (typically 15°-25°). This skew forces the operator to frequently manually adjust the bag's posture to maintain sewing trajectory accuracy, significantly reducing work efficiency and making it difficult to achieve adaptive compensation for the sewing trajectory. To solve this problem, existing bag machine manufacturers have improved the straight-arm support arm frame structure, optimizing it into a right-angle support arm frame. This allows the end of the support arm to precisely match the curved surface of the bag's inner cavity, enabling the side of the bag to fit horizontally against the support arm body, providing an ideal working plane for bag sewing. However, existing bag-making machines typically only support straight-arm frame structures. For example, Chinese utility model patent CN219991883U discloses a feeding mechanism for sewing machines that optimizes the transmission structure of the sewing machine's fabric feeding mechanism. It uses meshing drive and driven gears to drive roller feed teeth, but this transmission chain uses a linear layout. However, the power transmission path of this feeding mechanism is incompatible with the spatial turning requirements of right-angle frames, thus failing to meet the requirements of right-angle frame layouts and presenting a fundamental adaptation obstacle. Furthermore, existing bag-making machine feeding systems generally suffer from significant torque loss and power attenuation. This attenuation directly leads to a decrease in feeding step accuracy, especially when sewing hard materials, resulting in large step errors and requiring frequent machine stops for calibration. Therefore, it cannot meet the current needs of bag sewing.

[0003] In view of the above, it is necessary to make reasonable improvements to the existing horizontal bag sewing machine transmission system. To this end, the applicant has made a beneficial design, and the technical solution described below arose from this background. Utility Model Content

[0004] The objective of this invention is to provide a sewing transmission system for a horizontal bag making machine that is high in strength, durable, simple and compact in structure, and runs smoothly. It is advantageous to use a vertically arranged synchronous belt to achieve L-shaped power transmission to adapt to the transmission needs of a right-angle support arm structure. It is also advantageous to achieve stable power distribution through gear-connecting rod composite transmission and segmented connection of the power shaft, and to ensure precise synchronization of sewing and feeding movements in all directions, thereby improving the sewing efficiency and reliability of bags.

[0005] The present invention achieves its objective as follows: a sewing transmission system for a horizontal bag-making machine, comprising: a crank-connecting rod transmission mechanism, including a drive connecting rod linked to the machine head, a drive gear, and a driven gear, wherein the drive gear is connected to the drive connecting rod, and the driven gear is engaged with the drive gear; a transmission base, which is connected to the drive gear; a drive shaft assembly, including a front drive shaft and a rear drive shaft connected by a keyway, wherein the end of the rear drive shaft is connected to the driven gear; and a swing transmission shaft assembly, including a front swing transmission shaft and a rear swing transmission shaft connected by a keyway, wherein the rear drive shaft is connected to the driven gear. The end of the swing transmission shaft is linked with the crank-connecting rod transmission mechanism; the power transmission assembly includes an input gear, a synchronous belt, and an output gear. The input gear is driven by the front drive shaft, and the output gear is located below the input gear. The synchronous belt is perpendicular to the front drive shaft and is fitted onto the input gear and the output gear to achieve a transmission connection between them; the hook and shuttle unit includes a shuttle shaft that is driven by the output gear; the swing feeding assembly includes a swing connecting rod driven by the front swing transmission shaft, a feeding swing shaft, and a swing seat and feeding teeth that are linked to the shuttle shaft.

[0006] In a specific embodiment of this utility model, a drive connecting rod pin is provided on the drive connecting rod of the crank-connecting rod transmission mechanism. The drive connecting rod pin passes through the driving gear and is fixed to the drive connecting rod through a nut, thereby realizing the transmission connection between the drive connecting rod and the driving gear. A driving gear tooth portion is formed on the outer circumferential surface of the driving gear, and the driving gear tooth portion meshes with the driven gear. The crank-connecting rod transmission mechanism also includes a synchronous connecting rod and a lower synchronous rocker arm. The synchronous connecting rod is driven by the power of the bag machine head. The synchronous connecting rod is linked with the lower synchronous rocker arm through a synchronous swing pin. The end of the rear swing transmission shaft of the swing transmission shaft assembly is connected to the lower synchronous rocker arm, so that the rear swing transmission shaft can reciprocate under the drive of the lower synchronous rocker arm.

[0007] In another specific embodiment of the present invention, the end of the front drive shaft of the drive shaft assembly is connected to the front end of the rear drive shaft by means of a keyway connection, and a drive shaft connecting sleeve for fixing the two is provided at the connection between the front drive shaft and the rear drive shaft.

[0008] In another specific embodiment of the present invention, the end of the front swing transmission shaft of the swing transmission shaft assembly and the front end of the rear swing transmission shaft are also connected by a keyway, and a swing transmission shaft connecting sleeve for fixing the two is also provided at the connection between the front swing transmission shaft and the rear swing transmission shaft.

[0009] In another specific embodiment of this utility model, an input gear mating hole is provided in the input gear of the power transmission assembly. The shape of the input gear mating hole matches the shape of the front end of the front drive shaft, and the front end of the front drive shaft is engaged in the input gear mating hole, thereby realizing the transmission connection between the front drive shaft and the input gear. A clamping sleeve and a fastening ring are also provided on the input gear to realize its fixed connection with the front drive shaft.

[0010] In another specific embodiment of this utility model, the shuttle unit includes a shuttle shaft body and a shuttle support member formed at the front end of the shuttle shaft body. The end of the shuttle shaft body passes through the output gear and is connected to it, so that the output gear can drive the shuttle shaft to reciprocate. The shuttle unit also includes a swing shuttle and a shuttle core that are both installed on the shuttle support member.

[0011] In a further specific embodiment of this utility model, the swing link of the swing feeding assembly and the front end of the front swing transmission shaft of the swing transmission shaft assembly are connected by a swing link linkage arm. The swing link can reciprocate under the drive of the front swing transmission shaft. A feeding swing arm is also installed on the swing link. The end of the feeding swing shaft passes through the feeding swing arm and is connected to it. An arc-shaped feeding swing shaft swing arm is also formed at the front end of the feeding swing shaft. The swing seat and the feeding swing shaft swing arm are connected by a short link, so that the swing seat can reciprocate under the drive of the feeding swing shaft. The feeding tooth is fixedly installed on the swing seat by fasteners.

[0012] In a further specific embodiment of this utility model, a shuttle shaft cam portion is formed on the shuttle shaft and at the connection point corresponding to the shuttle shaft body and the shuttle component. The shuttle shaft cam portion is used to cooperate with the swing seat of the swing feeding assembly to jointly complete the feeding action. A swing seat mating groove is formed on the swing seat. The shape of the swing seat mating groove is adapted to the shape of the shuttle shaft cam portion, and the shuttle shaft cam portion is fitted into the swing seat mating groove. Thus, the shuttle shaft and the swing seat are positioned and connected together, so that the swing seat can move up and down under the drive of the shuttle shaft.

[0013] The beneficial effects of this utility model are as follows: First, by setting a vertically arranged synchronous belt, the limitations of traditional horizontal transmission are broken, the spatial turning requirements of the right-angle frame structure are met, the power is transmitted in an L-shape, and the sewing and feeding movements are precisely synchronized up, down, left, and right, improving the efficiency and reliability of sewing thick materials for bags. At the same time, it saves space and adapts to the compact structure of bag machines. Moreover, the transmission path reflects the bidirectional power distribution logic from the machine head to the hook and feed, achieving stable and reliable power transmission. Second, both the drive shaft assembly and the swing transmission shaft assembly adopt a segmented keyway shaft connection design, which improves the transmission rigidity and, together with the gear-connecting rod composite transmission, achieves stable power distribution transmission, further improving the efficiency and reliability of sewing thick materials for bags. The vertical layout of the synchronous belt optimizes the spatial structure, reduces power loss, and reduces the risk of sewing deviation. Attached Figure Description

[0014] Figure 1 This is an exploded view of the overall structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the drive shaft assembly and power transmission component in this utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the swing transmission shaft assembly and the swing feeding component in this utility model.

[0017] In the diagram: 1. Crank-connecting rod transmission mechanism; 11. Drive connecting rod; 111. Drive connecting rod pin; 12. Drive gear; 121. Drive gear teeth; 13. Driven gear; 14. Synchronous connecting rod; 141. Synchronous swing pin; 15. Lower synchronous rocker arm; 2. Transmission base; 3. Drive shaft assembly; 31. Front drive shaft; 32. Rear drive shaft; 33. Drive shaft connecting sleeve; 4. Swing transmission shaft assembly; 41. Front swing transmission shaft; 42. Rear swing transmission shaft; 43. Swing transmission shaft connecting sleeve; 5. Power transmission component; 51. Input gear; 5 11. Input gear mating hole; 512. Clamping sleeve; 513. Fastening ring; 52. Synchronous belt; 53. Output gear; 6. Hook and shuttle unit; 61. Shuttle support shaft; 611. Shuttle support shaft body; 612. Shuttle support piece; 613. Shuttle support shaft cam part; 62. Oscillating shuttle; 63. Shuttle core; 7. Oscillating feeding assembly; 71. Oscillating connecting rod; 711. Oscillating connecting rod linkage arm; 712. Feeding oscillating rocker arm; 72. Feeding oscillating shaft; 721. Feeding oscillating shaft oscillating arm; 73. Oscillating seat; 731. Oscillating seat mating groove; 74. Feeding tooth; 75. Short connecting rod. Detailed Implementation

[0018] The following will provide a detailed description by way of embodiments. However, the description of the embodiments is not intended to limit the present utility model. Any formal but not substantive equivalent transformations made based on the present utility model concept should be considered within the scope of the present utility model's technical solution.

[0019] In the following description, all directional or orientational concepts involving up, down, left, right, front, and back refer to the current situation. Figure 1 The description pertains to the location and state of the object, and therefore should not be construed as a specific limitation on the technical solution provided by this utility model.

[0020] Please see Figures 1 to 3 This paper illustrates a sewing transmission system for a horizontal bag-making machine, comprising: a crank-connecting rod transmission mechanism 1, including a drive connecting rod 11, a drive gear 12, and a driven gear 13 linked to the machine head; the drive gear 12 is connected to the drive connecting rod 11, and the driven gear 13 is engaged with the drive gear 12; a transmission base 2, which is connected to the drive gear 12; the crank-connecting rod transmission mechanism 1 serves as the core of power input; the drive connecting rod 11 converts the reciprocating motion of the machine head into the rotation of the drive gear 12, and then transmits the power to the driven gear 13 through gear engagement, forming the first stage of speed change; and the transmission base 2 serves as the mounting base for the drive gear 12, ensuring the stability of the gear rotation and preventing unstable operation due to vibration; a drive shaft assembly 3, including a front drive shaft 31 and a rear drive shaft 32 connected by a keyway; the end of the rear drive shaft 32 is connected to the driven gear 13; and a swing transmission shaft assembly 4. The system includes a front swing transmission shaft 41 and a rear swing transmission shaft 42 connected by a keyway. The end of the rear swing transmission shaft 42 is linked with the crank-connecting rod transmission mechanism 1. The power transmission assembly 5 includes an input gear 51, a synchronous belt 52, and an output gear 53. The input gear 51 is driven by the front drive shaft 31, and the output gear 53 is located below the input gear 51. The synchronous belt 52 is perpendicular to the front drive shaft 31 and is fitted onto the input gear 51 and the output gear 53 to achieve a transmission connection between them. The layout of the synchronous belt 52 breaks through the traditional horizontal transmission limitation, saves space, and is suitable for the transmission structure of the bag machine. The hook and shuttle unit 6 includes a shuttle shaft 61 that is connected to the output gear 53. The swing feeding assembly 7 includes a swing connecting rod 71 driven by the front swing transmission shaft 41, a feeding swing shaft 72, and a swing seat 73 and a feeding tooth 74 that are linked to the shuttle shaft 61.

[0021] In this embodiment, the technical solution utilizes the crank-connecting rod transmission mechanism 1, transmission base 2, drive shaft assembly 3, power transmission component 5 to the power transmission unit of hook and shuttle unit 6 to realize the reciprocating swing of hook and shuttle unit 6. By utilizing the reliable transmission of crank-connecting rod transmission mechanism 1, swing transmission shaft assembly 4 and swing feeding component 7, as well as the linkage between shuttle shaft 61, swing seat 73 and feeding tooth 74, the feeding tooth 74 realizes the up-down and left-right reciprocating swing, achieves the feeding action, and completes the work of sewing bags.

[0022] In this embodiment, a drive connecting rod pin 111 is provided on the drive connecting rod 11 of the aforementioned crank-connecting rod transmission mechanism 1. The drive connecting rod pin 111 passes through the aforementioned driving gear 12 and is fixed to the drive connecting rod 11 by a nut, thereby realizing the transmission connection between the drive connecting rod 11 and the aforementioned driving gear 12. A driving gear tooth portion 121 is formed on the outer circumferential surface of the aforementioned driving gear 12, and the driving gear tooth portion 121 meshes with the aforementioned driven gear 13. The driving gear tooth portion 121 adopts a full gear ring design, forming continuous meshing with the driven gear 13, reducing transmission impact. The aforementioned crank The linkage transmission mechanism 1 also includes a synchronous link 14 and a lower synchronous rocker arm 15. The aforementioned synchronous link 14 is driven by the power of the bag machine head. The aforementioned synchronous link 14 is linked with the lower synchronous rocker arm 15 through a synchronous swing pin 141. The end of the rear swing transmission shaft 42 of the aforementioned swing transmission shaft assembly 4 is connected to the aforementioned lower synchronous rocker arm 15, so that the rear swing transmission shaft 42 can reciprocate under the drive of the lower synchronous rocker arm 15. The synchronous link 14 and the lower synchronous rocker arm 15 constitute a second power branch, which distributes the power of the machine head to the swing transmission shaft assembly 4, and amplifies the swing stroke through the leverage effect of the rocker arm.

[0023] Please see Figure 2 The front drive shaft 31 of the aforementioned drive shaft assembly 3 is connected to the front end of the rear drive shaft 32 via a keyway. A drive shaft connecting sleeve 33 is provided at the connection between the front drive shaft 31 and the rear drive shaft 32 to fix them together. The drive shaft connecting sleeve 33 is tightened by interference fit or bolts to enhance the torsional strength of the keyway connection and prevent axial movement under high-speed transmission. The aforementioned drive shaft assembly 3 adopts a segmented keyway connection design. The front drive shaft 31 and the rear drive shaft 32 transmit torque through a mechanical coupling structure. The engagement of the rear drive shaft 32 with the driven gear 13 guides the gear power into the subsequent transmission chain.

[0024] Please see Figure 3The end of the front swing transmission shaft 41 of the aforementioned swing transmission shaft assembly 4 is also connected to the front end of the rear swing transmission shaft 42 by a keyway connection. A swing transmission shaft connecting sleeve 43 for fixing the two is also provided at the connection between the front swing transmission shaft 41 and the rear swing transmission shaft 42. The swing transmission shaft connecting sleeve 43 is also locked by interference fit or bolt to prevent the axial movement of the front swing transmission shaft 41 and the rear swing transmission shaft 42 under high-speed transmission.

[0025] In this embodiment, an input gear mating hole 511 is provided in the input gear 51 of the aforementioned power transmission component 5. The shape of the input gear mating hole 511 matches the shape of the front end of the aforementioned front drive shaft 31, and the front end of the aforementioned front drive shaft 31 is engaged in the input gear mating hole 511, thereby realizing the transmission connection between the aforementioned front drive shaft 31 and the input gear 51. The aforementioned input gear 51 is also provided with a clamping sleeve 512 and a fastening ring 513 for fixing it to the front drive shaft 31.

[0026] Please continue reading Figures 1 to 3 The aforementioned hook and shuttle unit 6 includes a shuttle shaft 61 body 611 and a shuttle support member 612 formed at the front end of the shuttle shaft 611. The end of the aforementioned shuttle shaft 611 passes through the aforementioned output gear 53 and is connected to it, so that the aforementioned output gear 53 can drive the shuttle shaft 61 to reciprocate. The aforementioned hook and shuttle unit 6 also includes a swing shuttle 62 and a shuttle core 63 that are both fitted and installed on the aforementioned shuttle support member 612.

[0027] In this embodiment, the swing link 71 of the aforementioned swing feeding assembly 7 and the front end of the front swing transmission shaft 41 of the aforementioned swing transmission shaft assembly 4 are connected by a swing link linkage arm 711. The swing link 71 can reciprocate under the drive of the front swing transmission shaft 41. A feeding swing arm 712 is also installed on the swing link 71. The end of the aforementioned feeding swing shaft 72 passes into the aforementioned feeding swing arm 712 and is connected to it. An arc-shaped feeding swing shaft swing arm 721 is also formed at the front end of the feeding swing shaft 72. The aforementioned swing seat 73 and the feeding swing shaft swing arm 721 are connected by a short link 75, so that the swing seat 73 can reciprocate under the drive of the feeding swing shaft 72. The aforementioned feeding tooth 74 is fixedly installed on the aforementioned swing seat 73 by fasteners.

[0028] Furthermore, a shuttle shaft cam portion 613 is formed on the aforementioned shuttle shaft 61 at the connection point corresponding to the shuttle shaft body 611 and the shuttle member 612. This shuttle shaft cam portion 613 is used to engage with the swing seat 73 of the swing feeding assembly 7 to jointly complete the feeding action. A swing seat mating groove 731 is formed on the aforementioned swing seat 73. The shape of the swing seat mating groove 731 matches the shape of the aforementioned shuttle shaft cam portion 613, and the aforementioned shuttle shaft cam portion 613 is fitted into the swing seat mating groove 731. Thus, the aforementioned shuttle shaft 61 and the swing seat 73 are positioned and connected together, allowing the swing seat 73 to move up and down under the drive of the shuttle shaft 61. In this embodiment, the mating structure of the swing seat 73 and the shuttle shaft cam portion 613 ensures that the up and down movement of the feed tooth 74 is strictly synchronized with the hooking of the shuttle 62, avoiding skipped stitches or fabric misalignment.

[0029] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

[0030] In summary, the technical solution provided by this utility model makes up for the shortcomings of the prior art, successfully completes the utility model task, and faithfully realizes the technical effects described by the applicant in the above technical effect column.

Claims

1. A sewing transmission system for a horizontal bag-making machine, characterized in that, include: The crank-connecting rod transmission mechanism (1) includes a drive connecting rod (11) linked to the engine head, a drive gear (12) and a driven gear (13), wherein the drive gear (12) is connected to the drive connecting rod (11) for transmission, and the driven gear (13) is connected to the drive gear (12) for gear meshing transmission; a transmission base (2) is connected to the drive gear (12) for transmission; a drive shaft assembly (3) includes a front drive shaft (31) and a rear drive shaft (32) connected by a keyway, wherein the end of the rear drive shaft (32) is connected to the driven gear (13) for transmission; and a swing transmission shaft assembly (4) includes a front swing transmission shaft (41) and a rear swing transmission shaft (42) connected by a keyway, wherein the end of the rear swing transmission shaft (42) is linked to the crank-connecting rod transmission mechanism (1). The power transmission assembly (5) includes an input gear (51), a timing belt (52), and an output gear (53). The input gear (51) is driven by the front drive shaft (31), and the output gear (53) is located below the input gear (51). The timing belt (52) is perpendicular to the front drive shaft (31). The timing belt (52) is fitted on the input gear (51) and the output gear (53) to realize the transmission connection between the two. The hook and shuttle unit (6) includes a shuttle shaft (61) that is connected to the output gear (53). The oscillating feeding assembly (7) includes an oscillating connecting rod (71) driven by the front oscillating transmission shaft (41), a feeding oscillating shaft (72), and an oscillating seat (73) and a feeding tooth (74) that are linked to the shuttle shaft (61).

2. The sewing transmission system of a horizontal bag-making machine according to claim 1, characterized in that: A drive connecting rod pin (111) is provided on the drive connecting rod (11) of the crank-connecting rod transmission mechanism (1). The drive connecting rod pin (111) passes through the drive gear (12) and is fixed to the drive connecting rod (11) by a nut, thereby realizing the transmission connection between the drive connecting rod (11) and the drive gear (12). A drive gear tooth (121) is formed on the outer circumferential surface of the drive gear (12), and the drive gear tooth (121) meshes with the driven gear (13). The crank-connecting rod transmission mechanism (1) further includes a synchronous connecting rod (14) and a lower synchronous rocker arm (15). The synchronous connecting rod (14) is driven by the power of the bag machine head. The synchronous connecting rod (14) is linked with the lower synchronous rocker arm (15) through a synchronous swing pin (141). The end of the rear swing transmission shaft (42) of the swing transmission shaft assembly (4) is connected to the lower synchronous rocker arm (15), so that the rear swing transmission shaft (42) can reciprocate under the drive of the lower synchronous rocker arm (15).

3. The sewing transmission system of a horizontal bag-making machine according to claim 1, characterized in that: The end of the front drive shaft (31) of the drive shaft assembly (3) is connected to the front end of the rear drive shaft (32) by means of keyway connection, and a drive shaft connecting sleeve (33) for fixing the two is provided at the connection between the front drive shaft (31) and the rear drive shaft (32).

4. The sewing transmission system of a horizontal bag-making machine according to claim 1, characterized in that: The end of the front swing transmission shaft (41) of the swing transmission shaft assembly (4) and the front end of the rear swing transmission shaft (42) are connected by a keyway. A swing transmission shaft connecting sleeve (43) for fixing the two is also provided at the connection between the front swing transmission shaft (41) and the rear swing transmission shaft (42).

5. The sewing transmission system of a horizontal bag-making machine according to claim 1, characterized in that: An input gear mating hole (511) is provided in the input gear (51) of the power transmission assembly (5). The shape of the input gear mating hole (511) matches the shape of the front end of the front drive shaft (31), and the front end of the front drive shaft (31) is fitted into the input gear mating hole (511), thereby realizing the transmission connection between the front drive shaft (31) and the input gear (51). A clamping sleeve (512) and a fastening ring (513) are also provided on the input gear (51) to realize its fixed connection with the front drive shaft (31).

6. The sewing transmission system of a horizontal bag-making machine according to claim 1, characterized in that: The shuttle unit (6) includes a shuttle shaft (61) body (611) and a shuttle support member (612) formed at the front end of the shuttle shaft body (611). The end of the shuttle shaft body (611) is inserted into the output gear (53) and is connected to it, so that the output gear (53) can drive the shuttle shaft (61) to reciprocate. The shuttle unit (6) also includes a swing shuttle (62) and a shuttle core (63) that are both fitted and installed on the shuttle support member (612).

7. The sewing transmission system of a horizontal bag-making machine according to claim 1, characterized in that: The swing link (71) of the swing feeding assembly (7) is connected to the front end of the front swing transmission shaft (41) of the swing transmission shaft assembly (4) through a swing link linkage arm (711). The swing link (71) can reciprocate under the drive of the front swing transmission shaft (41). A feeding swing arm (712) is also installed on the swing link (71). The end of the feeding swing shaft (72) passes into the feeding swing arm (712) and is connected to it. An arc-shaped feeding swing shaft swing arm (721) is also formed at the front end of the feeding swing shaft (72). The swing seat (73) and the feeding swing shaft swing arm (721) are connected by a short link (75) so that the swing seat (73) can reciprocate under the drive of the feeding swing shaft (72). The feeding tooth (74) is fixedly installed on the swing seat (73) by fasteners.

8. The sewing transmission system of a horizontal bag-making machine according to claim 6, characterized in that: A shuttle shaft cam portion (613) is formed on the shuttle shaft (61) and at the connection between the shuttle shaft body (611) and the shuttle member (612). The shuttle shaft cam portion (613) is used to cooperate with the swing seat (73) of the swing feeding assembly (7) to jointly complete the feeding action. A swing seat mating groove (731) is opened on the swing seat (73). The shape of the swing seat mating groove (731) is adapted to the shape of the shuttle shaft cam portion (613), and the shuttle shaft cam portion (613) is installed in the swing seat mating groove (731). Thus, the shuttle shaft (61) and the swing seat (73) are positioned and connected together, so that the swing seat (73) can move up and down under the drive of the shuttle shaft (61).

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