Suture machine fabric feeding transmission structure

Abstract

The utility model relates to a kind of sewing machine cloth feeding transmission structure, including the drive shaft that is rotated by motor drive and is installed in sewing machine, drive shaft left side output end is connected with the intermittent transmission mechanism that is relatively arranged on drive shaft and is driven by drive shaft and is connected out of sewing machine, intermittent transmission mechanism is drivingly connected with output shaft, drive shaft is driven output shaft to carry out intermittent rotation by intermittent transmission mechanism, output shaft front end is spaced apart and is provided with the cloth feeding shaft that is rotated by the transmission structure being set outside sewing machine, cloth feeding shaft is installed with the cloth feeding wheel that is used to forwardly convey cloth and contact with cloth, intermittent transmission mechanism and transmission structure are relatively arranged in the outside of sewing machine, to avoid intermittent transmission mechanism occupies larger installation space in sewing machine and facilitate the installation and maintenance of intermittent transmission mechanism, at the same time, intermittent transmission mechanism is relatively arranged on drive shaft, so that the transmission of intermittent transmission mechanism is stable.

Description

Technical Field

[0001] This utility model relates to the field of sewing machines, and in particular to a fabric feeding transmission structure for a sewing machine. Background Technology

[0002] Current intermittent fabric feeding technology in sewing machines is exemplified by a sewing machine with patent application number CN202310535829.0 that enables intermittent fabric feeding. This sewing machine includes a fabric belt assembly and an intermittent drive assembly. The fabric belt assembly includes a fabric belt wheel and a transmission rod connected to the fabric belt wheel. The intermittent drive assembly includes a drive body and a planetary gear set connected to the drive body and driving the transmission rod based on the operation of the drive body. In the aforementioned patent, the intermittent drive assembly has a relatively complex structure and is located relatively inside the sewing machine. Assembly and maintenance are relatively complex, and it occupies a large portion of the original installation space of the sewing machine, thus affecting the original structural design of the sewing machine. Utility Model Content

[0003] This utility model aims to solve the problems existing in the prior art by providing a fabric feeding transmission structure for a sewing machine. The transmission structure is designed to be different from the original drive shaft of the sewing machine and occupies less installation space in the sewing machine. It is simple in structure and easy to maintain.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: This sewing machine feeding transmission structure includes a drive shaft installed inside the sewing machine and driven to rotate by a motor. The output end of the drive shaft extends out of the sewing machine and is connected to an intermittent transmission mechanism that is oppositely arranged on the drive shaft and driven by the drive shaft. The intermittent transmission mechanism is connected to an output shaft. The drive shaft drives the output shaft to rotate intermittently through the intermittent transmission mechanism. The front end of the output shaft is spaced apart and driven to rotate by a transmission structure located outside the sewing machine. The feed shaft is equipped with feed wheels that contact the fabric and are used to feed the fabric forward. The intermittent transmission mechanism and the transmission structure are oppositely arranged on the outside of the sewing machine, thereby avoiding the intermittent transmission mechanism occupying a large installation space inside the sewing machine and facilitating the installation and maintenance of the intermittent transmission mechanism. At the same time, the intermittent transmission mechanism is oppositely arranged on the drive shaft, which makes the transmission of the intermittent transmission mechanism stable.

[0005] Preferably, the intermittent transmission mechanism includes an eccentric camshaft concentrically mounted on the left output end of the drive shaft and rotating with the drive shaft, an internal gear relatively eccentrically mounted on the eccentric camshaft and rotating with the eccentric camshaft, and an external gear meshing with the external gear and concentrically mounted on the drive shaft. The output shaft is concentrically mounted on the external gear and rotates intermittently by being driven by the external gear. The eccentrically rotating internal gear drives the external gear to rotate intermittently, making the transmission relatively stable. The eccentric camshaft, internal gear, and external gear are arranged on the same straight line relative to the drive shaft, which makes the transmission of the intermittent transmission mechanism relatively stable. At the same time, the above-mentioned intermittent transmission mechanism has a simple structure, is relatively easy to install, and is convenient for subsequent assembly and maintenance.

[0006] Preferably, the transmission structure includes a driving synchronous pulley mounted on the output shaft, a driven synchronous pulley that drives the fabric feeding shaft to rotate, and a synchronous belt sleeved on the outside of the driving and driven synchronous pulleys. The transmission between the output shaft and the fabric feeding shaft is realized through the synchronous belt pulley, which makes the transmission efficiency stable and the manufacturing cost relatively low.

[0007] Preferably, the eccentric camshaft includes a connecting shaft with one end connected to the drive shaft and concentrically arranged relative to the drive shaft, and an eccentric shaft connected to the other end of the connecting shaft and eccentrically arranged relative to the connecting shaft. The internal gear is installed on the outside of the eccentric shaft. The eccentric shaft drives the internal gear to rotate eccentrically, thereby causing the eccentrically rotating internal gear to intermittently drive the external gear to rotate, thus realizing intermittent transmission.

[0008] Preferably, the transmission structure further includes a large gear mounted on the feeding shaft, a small gear meshing with the large gear, and a transmission shaft connecting the driven synchronous wheel and the small gear. The transmission structure further reduces the rotational speed of the feeding shaft through the transmission between the large gear and the small gear, thereby meeting the corresponding feeding requirements.

[0009] Preferably, it also includes a gear transmission base mounted on the sewing machine. The transmission shaft and the output shaft pass through the gear transmission base on the left and right sides respectively and are rotatably connected to the gear transmission base through bearings. The inner end face of the gear transmission base is also provided with a receiving groove for accommodating the large gear, small gear, external gear and internal gear. The gear transmission base facilitates the stable installation of the transmission shaft and the output shaft. At the same time, it allows the large gear, small gear, external gear and internal gear to be installed in the receiving groove between the gear transmission base and the sewing machine, thereby achieving a sealed installation of the gears and ensuring the long-term stable operation of the transmission structure.

[0010] Preferably, a tensioning wheel is installed on the gear transmission base to press and pre-tighten the synchronous belt outside the synchronous belt. The tensioning wheel ensures that the synchronous belt is tensioned outside the driving and driven synchronous pulleys, thus ensuring stable transmission.

[0011] The beneficial effects of this utility model are as follows: By arranging the intermittent transmission mechanism and the transmission structure opposite each other on the outside of the sewing machine, the intermittent transmission mechanism avoids occupying a large installation space inside the sewing machine and facilitates the installation and maintenance of the intermittent transmission mechanism. At the same time, the intermittent transmission mechanism is arranged opposite each other on the drive shaft, which makes the transmission of the intermittent transmission mechanism stable. Furthermore, the eccentric camshaft, internal gear, and external gear are arranged on the same straight line relative to the drive shaft, which makes the transmission of the intermittent transmission mechanism relatively stable. In addition, the above-mentioned intermittent transmission mechanism has a simple structure, is relatively easy to install, and facilitates subsequent assembly and maintenance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a schematic diagram showing the installation of the drive shaft, intermittent transmission mechanism, and output shaft.

[0014] Figure 3 This is a front view of the present invention after it has been installed in a sewing machine;

[0015] Figure 4 This is a left view of the present invention after it has been installed in a sewing machine;

[0016] Figure 5 This is a schematic diagram of the installation of the present invention and the gear transmission base 12.

[0017] Explanation of reference numerals in the attached drawings: 1. Drive shaft; 2. Intermittent transmission mechanism; 2-1. Eccentric camshaft; 2-2. Internal gear; 2-3. External gear; 3. Output shaft; 4. Feed shaft; 5. Feed wheel; 6. Driving synchronous pulley; 7. Driven synchronous pulley; 8. Synchronous belt; 9. Large gear; 10. Small gear; 11. Transmission shaft; 12. Gear transmission base; 13. Sewing machine; 15. Receiving groove; 16. Tensioning wheel; 17. Connecting shaft; 18. Eccentric shaft. Detailed Implementation

[0018] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0019] Referring to the accompanying drawings: This embodiment discloses a fabric feeding transmission structure for a sewing machine. The existing crankshaft within the zipper sewing machine serves as the power source to drive the corresponding fabric feeding mechanism for feeding operations. The fabric feeding transmission structure in this embodiment includes a drive shaft 1 installed within the sewing machine 13 and rotated by a motor. The left output end of the drive shaft 1 extends out of the sewing machine 13 and is connected to an intermittent transmission mechanism 2, which is mounted on the drive shaft 1 and driven by the drive shaft 1. The intermittent transmission mechanism 2 is connected to an output shaft 3. The drive shaft 1 drives the output shaft 3 to rotate intermittently via the intermittent transmission mechanism 2. The front end is provided with a feed shaft 4 that is driven to rotate by a transmission structure located outside the sewing machine 13. The feed shaft 4 is equipped with a feed wheel 5 that contacts the fabric and is used to feed the fabric forward. In this embodiment, the drive shaft 1 and the feed shaft 4 are rotatably connected to the sewing machine 13. The original motor of the sewing machine 13 drives the drive shaft 1 and the intermittent transmission mechanism 2 to work, so that the output shaft 3 can rotate intermittently. In turn, the output shaft 3 and the intermittent transmission mechanism 2 drive the feed shaft 4 and the feed wheel 5 installed on the feed shaft 4 to rotate intermittently, so as to realize the fabric feeding function while performing sewing work.

[0020] Among them, such as Figure 2 As shown, the intermittent transmission mechanism 2 in this embodiment includes an eccentric camshaft 2-1 concentrically mounted on the left output end of the drive shaft 1 and rotating with the drive shaft 1; an internal gear 2-2 eccentrically mounted on the eccentric camshaft 2-1 and rotating with the eccentric camshaft 2-1; and an external gear 2-3 meshing with the external gear 2-2 and concentrically mounted on the drive shaft 1. The output shaft 3 is concentrically mounted on the external gear 2-3 and rotates intermittently by being driven by the external gear 2-3. Specifically, the eccentric camshaft 2-1 in this embodiment includes a connecting shaft 17 connected to the drive shaft 1 at one end and concentrically mounted on the drive shaft 1, and an eccentric shaft connected to the other end of the connecting shaft 17 and eccentrically mounted on the connecting shaft 17. 18. The internal gear 2-2 is mounted on the outside of the eccentric shaft 18. In operation, the drive shaft 1 rotates counterclockwise and drives the eccentric cam shaft 2-1 to rotate. Since the eccentric shaft 18 is eccentrically set relative to the connecting shaft 17 (i.e. relative to the drive shaft 1), the internal gear 2-2 on the eccentric shaft 18 rotates eccentrically. The external gear 2-3 on the outside of the internal gear 2-2 is concentrically set with the drive shaft 1, so the internal gear 2-2 is eccentrically set relative to the external gear 2-3. When the internal gear 2-2 rotates eccentrically, it contacts and meshes with the external gear 2-3 and drives the external gear 2-3 to rotate intermittently. The external gear 2-3 then drives the output shaft 3 to rotate intermittently to achieve intermittent transmission.

[0021] Furthermore, such as Figure 1As shown, the transmission structure in this embodiment can be a synchronous belt transmission structure, including a driving synchronous pulley 6 mounted on the output shaft 3, a driven synchronous pulley 7 that drives the fabric feeding shaft 4 to rotate, and a synchronous belt 8 sleeved on the outside of the driving synchronous pulley 6 and the driven synchronous pulley 7. The transmission connection between the output shaft 3 and the fabric feeding shaft 4 is realized through the synchronous belt transmission structure. At the same time, in order to achieve the corresponding deceleration effect, the transmission structure in this embodiment also includes a reduction gear structure, specifically including a large gear 9 mounted on the fabric feeding shaft 4, a small gear 10 meshing with the large gear 9, and a transmission shaft 11 connecting the driven synchronous pulley 7 and the small gear 10. Thus, when the output shaft 3 drives the fabric feeding shaft 4, the deceleration effect of the transmission through the small gear 10 and the large gear 9 makes the rotation speed of the fabric feeding shaft 4 relatively slow down, ensuring a certain fabric feeding effect.

[0022] Furthermore, such as Figure 3 and Figure 4 As shown, this embodiment also includes a gear transmission base 12 mounted on the sewing machine. The gear transmission base 12 provides mounting and support for the output shaft 3 and the transmission shaft 11. Specifically, the transmission shaft 11 and the output shaft 3 are respectively arranged through the gear transmission base 12 on the left and right sides. The gear transmission base 12 can be detachably mounted on the sewing machine housing using screws. Figure 3-5 As shown, the drive shaft 11 is rotatably mounted in the first mounting hole 13 via bearings. Correspondingly, the driven synchronous wheel 7 is mounted on the drive shaft 11 and located outside the gear transmission base 12. The output shaft 3 is also rotatably mounted in the second mounting hole 14 via bearings. The driving synchronous wheel 6 is mounted on the output shaft 3 and located outside the gear transmission base 12. This allows the output shaft 3 and drive shaft 11 to be effectively supported by the gear transmission base 12 during use, ensuring stable installation of the transmission structure and stable operation of the fabric feeding transmission structure. Furthermore, in this embodiment, the inner end face of the gear transmission base 12 is also provided with a receiving groove 15 for accommodating the large gear 9, small gear 10, external gear 2-3, and internal gear 2-2. This allows the large gear 9, small gear 10, external gear 2-3, and internal gear 2-2 to be surrounded between the gear transmission base 12 and the sewing machine during installation, providing a sealing protection for the gears and preventing fine threads or debris from falling into the gears and affecting the normal operation of the transmission structure. Meanwhile, as Figure 4 As shown, in order to ensure the stable transmission of the synchronous belt 8, a tensioning wheel 16 is installed on the gear transmission base 12 to press and pre-tighten the synchronous belt 8 outside the synchronous belt 8, so that the synchronous belt 8 can be in a taut state, thereby ensuring the stable transmission between the driving synchronous pulley 6 and the driven synchronous pulley 7.

[0023] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A fabric feeding transmission structure for a sewing machine, comprising a drive shaft (1) installed inside the sewing machine and driven to rotate by a motor, characterized in that: The left output end of the drive shaft (1) passes through the sewing machine and is connected to an intermittent transmission mechanism (2) that is oppositely arranged on the drive shaft (1) and driven by the drive shaft (1). The intermittent transmission mechanism (2) is connected to an output shaft (3). The drive shaft (1) drives the output shaft (3) to rotate intermittently through the intermittent transmission mechanism (2). The front end of the output shaft (3) is provided with a feed shaft (4) that is driven to rotate by a transmission structure arranged outside the sewing machine. The feed shaft (4) is equipped with a feed wheel (5) that contacts the fabric and is used to convey the fabric forward.

2. The fabric feeding transmission structure of a sewing machine according to claim 1, characterized in that: The intermittent transmission mechanism (2) includes an eccentric camshaft (2-1) that is concentrically mounted on the output end of the drive shaft (1) and rotates with the drive shaft (1), an internal gear (2-2) that is relatively eccentrically mounted on the eccentric camshaft (2-1) and rotates with the eccentric camshaft (2-1), and an external gear (2-3) that meshes with the outside of the internal gear (2-2) and is concentrically mounted on the drive shaft (1). The output shaft (3) is concentrically mounted on the external gear (2-3) and rotates intermittently by being driven by the external gear (2-3).

3. The sewing machine feeding transmission structure according to claim 1, characterized in that: The transmission structure includes a driving synchronous pulley (6) mounted on the output shaft (3), a driven synchronous pulley (7) that drives the feed shaft (4) to rotate, and a synchronous belt (8) sleeved on the outside of the driving synchronous pulley (6) and the driven synchronous pulley (7).

4. The fabric feeding transmission structure for a sewing machine according to claim 2, characterized in that: The eccentric camshaft (2-1) includes a connecting shaft (17) connected to the drive shaft (1) at one end and concentrically arranged relative to the drive shaft (1) and an eccentric shaft (18) connected to the other end of the connecting shaft (17) and eccentrically arranged relative to the connecting shaft (17). The internal gear (2-2) is installed on the outside of the eccentric shaft (18).

5. The fabric feeding transmission structure for a sewing machine according to claim 3, characterized in that: The transmission structure also includes a large gear (9) mounted on the feed shaft (4), a small gear (10) meshing with the large gear (9) and a transmission shaft (11) connecting the driven synchronous pulley (7) and the small gear (10).

6. The fabric feeding transmission structure of a sewing machine according to claim 5, characterized in that: It also includes a gear transmission base (12) installed on the sewing machine. The transmission shaft (11) and the output shaft (3) pass through the left and right sides respectively and are rotatably connected in the gear transmission base (12) through bearings. The inner end face of the gear transmission base (12) is also provided with a receiving groove (15) for accommodating the large gear (9), small gear (10), external gear (2-3) and internal gear (2-2).

7. The fabric feeding transmission structure for a sewing machine according to claim 6, characterized in that: The gear transmission base (12) is equipped with a tensioning wheel (16) located outside the synchronous belt (8) to press and pre-tighten the synchronous belt (8).

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