Upper differential feeding mechanism of sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to an upper differential feeding mechanism of a sewing machine. A driving motor is arranged on the rear side face of the machine shell, an output shaft of the driving motor is connected with a crank part of an upper swing seat control rotating shaft through a driving assembly, and a rotating shaft part of the upper swing seat control rotating shaft is connected with one end of the upper swing seat. The other end of the upper swing seat is connected with a fixing pin, the upper swing seat is further rotationally provided with a first feeding swing plate, and the first feeding swing plate is connected with an upper shaft through a feeding connecting rod pin, an upper differential connecting rod and an upper differential cam. The first feeding swing plate is further connected with a differential swing shaft through a feeding connecting rod pin, a second feeding swing plate, a feeding connecting rod crank pin and an upper feeding crank. The driving motor is installed on the rear side face of the machine shell, so that more space is reserved for the right side of the machine shell, and reasonable layout of other functional parts of the sewing machine is facilitated.

Description

Technical fields:

[0001] This utility model belongs to the field of sewing machine technology, and specifically refers to an upper differential feeding mechanism for a sewing machine. Background technology:

[0002] The differential adjustment is to adapt to different types of fabrics. When sewing fabrics with high elasticity, it is necessary to adjust the differential to control the feed speed of the upper feed dog so that it is different from the feed speed of the active feed dog, thereby achieving a better sewing effect.

[0003] Currently, most differential adjustment mechanisms use automatic motor control. Additionally, mechanisms such as presser foot lifting and stitch length adjustment are also driven by motors. However, motors are typically mounted on the right side of the sewing machine, and the mounting space on the right side is limited. Therefore, it is necessary to rationally arrange the mounting positions of the drive motors for each mechanism of the sewing machine to facilitate the layout of other functional components. Summary of the Invention:

[0004] The purpose of this invention is to provide a differential feeding mechanism for a sewing machine that facilitates the rational layout of other functional components of the sewing machine.

[0005] This utility model is implemented as follows:

[0006] A differential feeding mechanism for a sewing machine includes a machine housing, an upper shaft, an upper feed dog, and an upper swing seat. The upper swing seat swings, causing the differential swing shaft to rotate and the upper feed dog to move back and forth. A drive motor is provided on the rear side of the machine housing. The drive motor includes an output shaft, which is connected to the crank portion of the control shaft of the upper swing seat via a drive assembly. The shaft portion of the control shaft of the upper swing seat is connected to one end of the upper swing seat, and the other end of the upper swing seat is connected to a fixing pin. The upper swing seat is rotatably connected to the machine housing via the shaft portion of the control shaft and the fixing pin. The upper swing seat also has a first feeding swing plate rotatably mounted on it. The first feeding swing plate is connected to the upper shaft via a feeding connecting rod pin, an upper differential connecting rod, and an upper differential cam. The first feeding swing plate is also connected to the differential swing shaft via a feeding connecting rod pin, a second feeding swing plate, a feeding connecting rod crank pin, and an upper feeding crank.

[0007] In the above-mentioned differential feeding mechanism of a sewing machine, the drive assembly includes a drive crank with one end fixed on the output shaft, and the other end of the drive crank is connected to the crank portion of the upper swing seat control shaft through the upper differential control drive linkage.

[0008] In the above-mentioned differential feeding mechanism of a sewing machine, the crank portion of the upper swing seat control shaft and the upper differential tooth control drive linkage are located outside the right side wall of the machine housing.

[0009] In the differential feeding mechanism of the sewing machine described above, the drive motor is fixed to the rear side of the machine housing via a motor bracket.

[0010] In the differential feeding mechanism of the sewing machine described above, a groove is provided on the rear side of the machine housing to embed the drive motor, and the motor bracket is fixed in the groove.

[0011] In the above-mentioned differential feeding mechanism of a sewing machine, the upper swing seat control shaft and the fixing pin are rotatably mounted on the sleeve, and the sleeve is fixed on the machine housing.

[0012] In the above-mentioned differential feeding mechanism of a sewing machine, a protective cover is provided outside the drive motor. The protective cover includes a cover body with one end open. Several fixing feet are provided at the open end of the cover body. Mounting holes are provided on the fixing feet. The protective cover is connected to the machine housing by fasteners passing through the mounting holes. The cover body is provided with through holes that correspond one-to-one with the position and number of the mounting holes.

[0013] The outstanding advantages of this utility model compared to the prior art are:

[0014] 1. This utility model installs the drive motor on the rear side of the machine housing, thereby reserving more space on the right side of the machine housing, which facilitates the reasonable layout of other functional components of the sewing machine.

[0015] 2. The drive assembly of this utility model includes a drive crank and an upper differential tooth control drive connecting rod. It has a reasonable layout and compact structure. Moreover, by adopting a crank-connecting rod structure, it converts rotational motion into oscillation, resulting in high transmission efficiency. Attached image description:

[0016] Figure 1 This is one of the three-dimensional schematic diagrams of this utility model;

[0017] Figure 2 This is the second three-dimensional schematic diagram of this utility model;

[0018] Figure 3 This is a schematic diagram of the protective cover of this utility model after disassembly;

[0019] Figure 4 This is one of the schematic diagrams of the upper differential feeding mechanism of this utility model;

[0020] Figure 5 This is the second schematic diagram of the upper differential feeding mechanism of this utility model;

[0021] Figure 6 This is a schematic diagram of the protective cover of this utility model.

[0022] In the diagram: 1. Housing; 2. Upper shaft; 3. Upper feed tooth; 4. Upper swing seat; 5. Differential swing shaft; 6. Drive motor; 7. Output shaft; 8. Upper swing seat control shaft; 9. Crank section; 10. Shaft section; 11. First feed swing plate; 12. Upper differential connecting rod; 13. Upper differential cam; 14. Second feed swing plate; 15. Upper feed crank; 16. Drive crank; 17. Upper differential tooth control drive connecting rod; 18. Motor bracket; 19. Groove; 20. Sleeve; 21. Protective cover; 22. Fixing foot; 23. Mounting hole; 24. Through hole; 25. Heat dissipation hole. Detailed implementation method:

[0023] The present invention will be further described below with reference to specific embodiments:

[0024] like Figures 1-6 This utility model provides an upper differential feeding mechanism for a sewing machine. The sewing machine includes a housing 1, an upper shaft 2, an upper feed dog 3, and an upper swing seat 4. The upper swing seat 4 swings, driving the differential swing shaft 5 to rotate and causing the upper feed dog 3 to move back and forth. A drive motor 6 is provided on the rear side of the housing 1. The drive motor 6 includes an output shaft 7. The output shaft 7 is connected to the crank portion 9 of the upper swing seat control shaft 8 through a drive assembly. The shaft portion 10 of the upper swing seat control shaft 8 is connected to one end of the upper swing seat 4. The other end of the swing seat 4 is connected to the fixed pin. The upper swing seat 4 is rotatably connected to the housing 1 via the rotating shaft part 10 of the upper swing seat control shaft 8 and the fixed pin. The upper swing seat 4 is also rotatably provided with a first feeding swing plate 11. The first feeding swing plate 11 is connected to the upper shaft 2 via the feeding connecting rod pin, the upper differential connecting rod 12, and the upper differential cam 13. The first feeding swing plate 11 is also connected to the differential swing shaft 5 via the feeding connecting rod pin, the second feeding swing plate 14, the feeding connecting rod crank pin, and the upper feeding crank 15.

[0025] When the drive motor 6 operates, its shaft rotates, causing the drive assembly to move. The upper swing seat controls the rotation of the shaft 8, causing the upper swing seat 4 to rotate as well. The first feeding swing plate 11, the second feeding swing plate 14, and the upper feeding crank 15, connected to the upper swing seat 4, begin to swing, thereby driving the differential swing shaft 5 to rotate, ultimately achieving the forward and backward movement of the upper feed tooth 3. The forward and backward movement distance of the upper feed tooth 3 can be adjusted by the rotation amplitude of the output shaft 7 of the drive motor 6. This invention mounts the drive motor 6 on the rear side of the housing 1, thus reserving more space on the right side of the housing 1, facilitating the rational layout of other functional components of the sewing machine.

[0026] Generally, the drive motor 6 is a stepper motor, but in actual use, a servo motor or other type can also be used.

[0027] like Figures 1-5As shown, the drive assembly includes a drive crank 16 with one end fixed to the output shaft 7, and the other end of the drive crank 16 is connected to the crank portion 9 of the upper swing seat control shaft 8 via an upper differential tooth control drive linkage 17.

[0028] The drive assembly of this utility model includes a drive crank 16 and an upper differential tooth control drive connecting rod 17. It has a reasonable layout and compact structure. Moreover, by adopting a crank-connecting rod structure, it converts rotational motion into oscillation, resulting in high transmission efficiency.

[0029] Correspondingly, the crank portion 9 of the upper swing seat control shaft 8 and the upper differential tooth control drive linkage 17 are located outside the right side wall of the housing 1.

[0030] It should be noted that the drive motor 6 of this utility model is fixed to the rear side of the housing 1 by the motor bracket 18.

[0031] To shorten the distance between the output shaft of the drive motor and the control shaft 8 of the upper swing seat, this invention provides a groove 19 on the rear side of the housing 1 to embed the drive motor portion, and the motor bracket 18 is fixedly mounted in the groove 19. This arrangement makes the structure more compact and the transmission more stable.

[0032] The upper swing seat control shaft 8 of this invention has a rotating shaft portion 10 and a fixing pin rotatably mounted on a sleeve 20, which is fixed to the housing 1. The rotating shaft portion 10 and the fixing pin of the upper swing seat control shaft 8 are coaxially aligned, and the rotating shaft portion 10 and the fixing pin are rotatably connected to the sleeve 20, resulting in higher coaxiality and more flexible rotation after installation.

[0033] like Figure 1 , Figure 2 and Figure 6 As shown, a protective cover 21 is provided outside the drive motor 6. The protective cover 21 includes a cover body with one open end. Several fixing feet 22 are provided at the open end of the cover body, and mounting holes 23 are provided on the fixing feet 22. The protective cover 21 is connected to the housing 1 by fasteners passing through the mounting holes 23. The cover body is provided with through holes 24 that correspond one-to-one in position and number to the mounting holes 23. Generally, the fasteners are screws, and a screwdriver is passed through the through holes 24 to tighten the screws at the mounting holes 23 onto the housing 1.

[0034] In addition, in order to improve the heat dissipation effect, the protective cover 21 of this utility model is provided with heat dissipation holes 25.

[0035] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A differential feeding mechanism for a sewing machine, the sewing machine comprising a housing (1), an upper shaft (2), an upper feed dog (3), and an upper swing seat (4), wherein the upper swing seat (4) swings to drive the differential swing shaft (5) to rotate, thereby driving the upper feed dog (3) to move back and forth, characterized in that: A drive motor (6) is provided on the rear side of the housing (1). The drive motor (6) includes an output shaft (7). The output shaft (7) is connected to the crank portion (9) of the upper swing seat control shaft (8) via a drive assembly. The shaft portion (10) of the upper swing seat control shaft (8) is connected to one end of the upper swing seat (4). The other end of the upper swing seat (4) is connected to a fixing pin. The upper swing seat (4) is connected to the crank portion (10) of the upper swing seat control shaft (8) via a drive assembly. 10) and fixed pin are rotatably connected to the housing (1). The upper swing seat (4) is also rotatably provided with a first feeding swing plate (11). The first feeding swing plate (11) is connected to the upper shaft (2) through the feeding connecting rod pin, the upper differential connecting rod (12), and the upper differential cam (13). The first feeding swing plate (11) is also connected to the differential swing shaft (5) through the feeding connecting rod pin, the second feeding swing plate (14), the feeding connecting rod crank pin, and the upper feeding crank (15).

2. The differential feeding mechanism for a sewing machine according to claim 1, characterized in that: The drive assembly includes a drive crank (16) with one end fixed on the output shaft (7), and the other end of the drive crank (16) is connected to the crank part (9) of the upper swing seat control shaft (8) via the upper differential tooth control drive linkage (17).

3. The upper differential feeding mechanism of a sewing machine according to claim 2, characterized in that: The crank portion (9) of the upper swing seat control shaft (8) and the upper differential tooth control drive linkage (17) are located outside the right side wall of the housing (1).

4. The upper differential feeding mechanism of a sewing machine according to claim 1, 2, or 3, characterized in that: The drive motor (6) is fixed to the rear side of the housing (1) by a motor bracket (18).

5. The upper differential feeding mechanism of a sewing machine according to claim 4, characterized in that: The rear side of the housing (1) is provided with a groove (19) for partially embedding the drive motor (6), and the motor bracket (18) is fixed in the groove (19).

6. The upper differential feeding mechanism of a sewing machine according to claim 1, characterized in that: The shaft portion (10) of the upper swing seat control shaft (8) and the fixing pin are rotatably mounted on the sleeve (20), and the sleeve (20) is fixed on the housing (1).

7. The upper differential feeding mechanism of a sewing machine according to claim 1, characterized in that: The drive motor (6) is provided with a protective cover (21). The protective cover (21) includes a cover body with one end open. Several fixing feet (22) are provided at the open end of the cover body. Mounting holes (23) are provided on the fixing feet (22). The protective cover (21) is connected to the housing (1) by fasteners passing through the mounting holes (23). The cover body is provided with through holes (24) that correspond one-to-one with the position and number of the mounting holes (23).

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