Double-motor sewing machine

Abstract

The invention provides a double-motor sewing machine which comprises a machine shell, a lower motor is installed in the rear lower end of the machine shell, the front end of a motor shaft of the lower motor is connected with a small gear, the motor shaft is sleeved with a motor shaft sleeve, the small gear is meshed with a large gear on a cloth feeding main shaft, and the front end of the cloth feeding main shaft is connected with a driving gear. The driving gear is connected with an upper cloth feeding wheel through a universal shaft; a driving gear on the cloth feeding main shaft is meshed with a lower gear, the lower gear is fixedly connected to the rear end of a lower cloth feeding shaft, and the front end of the lower cloth feeding shaft is connected with a lower cloth feeding gear. By arranging a transmission structure that the lower motor drives the small gear to be meshed with the large gear of the cloth feeding main shaft, the upper cloth feeding wheel is connected with the driving gear and the cardan shaft in cooperation, the lower gear is linked with the lower cloth feeding shaft and the lower cloth feeding gear, the upper cloth feeding wheel and the lower cloth feeding wheel rotate at the same speed, synchronous driving force for clamping cloth is formed, and parallel and synchronous feeding is achieved; cloth is prevented from skewing or wrinkling, and sewing precision is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewing machines, in particular to a dual-motor sewing machine. Background Art

[0002] A sewing machine uses a mechanical or electronic device to drive a needle and thread to sew fabric together. It can quickly and accurately create complex stitches that are difficult to achieve by hand. The needle pierces the fabric up and down, interweaving with the bobbin thread to form a lockstitch, significantly improving sewing efficiency. It is widely used in clothing, home textiles, and industrial production. Home sewing machines offer a variety of functions (such as lockstitching, hemming, and embroidery), while industrial models focus on high speed and durability. They are core tools for the modern textile industry and home crafts.

[0003] In the existing technology, the cloth feeding mechanism of traditional sewing machines mostly adopts a single motor drive or a simple gear transmission. On the one hand, the single motor is responsible for both sewing execution and cloth feeding drive functions. The uneven power distribution can easily lead to fluctuations in the cloth feeding speed. Especially when processing scenes that require dense stitches such as trouser legs, problems such as cloth skewness and wrinkles often occur due to asynchronous cloth feeding. On the other hand, the fixing method of the cloth feeding spindle lacks a positioning structure, and axial offset is common. Combined with the transmission ratio error of the upper and lower cloth feeding wheels, it is difficult to achieve parallel and synchronous transportation of the cloth, resulting in uneven density of sewing stitches, affecting product quality. Summary of the Invention

[0004] The object of the present invention is to provide a dual-motor sewing machine to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A dual-motor sewing machine comprising:

[0007] The casing has a lower motor installed in the rear lower end of the casing, the front end of the motor shaft of the lower motor is fixedly connected to a small gear by screws, a motor sleeve is sleeved on the motor shaft, the small gear is meshed with the large gear on the cloth feeding main shaft, the front end of the cloth feeding main shaft is fixedly connected to the driving gear by screws, and the driving gear is connected to the upper cloth feeding wheel through a universal shaft for driving the upper cloth feeding wheel to rotate;

[0008] The driving gear on the cloth feed main shaft is meshed with the lower gear, the lower gear is fixedly connected to the rear end of the lower cloth feed shaft, and the front end of the lower cloth feed shaft is fixedly connected and installed with a lower cloth feed gear, and the lower cloth feed gear rotates synchronously with the upper cloth feed wheel to achieve parallel synchronous feeding.

[0009] Preferably, an upper motor is installed in the upper rear end of the casing, and the upper motor is connected to the upper shaft through a connector. A winding crank is fixedly connected to the middle of the upper shaft, and a winder is fixedly connected to the top of the casing. The winding crank rotates to drive the winder to wind the bottom line.

[0010] Preferably, a needle bar crank is installed at the front end of the upper shaft, and the front end of the needle bar crank is hinged to the thread take-up rod. The thread take-up rod is connected to the upper end of the needle bar through a connecting rod structure, and the lower end of the needle bar is fixedly installed with a fixed sleeve. When the needle bar drives the machine needle to move up and down at a specified position, the thread take-up rod performs the thread picking action synchronously.

[0011] Preferably, a vertical shaft is vertically installed in the rear end of the casing, the top and bottom of the vertical shaft are fixedly connected with a vertical shaft upper bevel gear and a vertical shaft lower bevel gear respectively, and the lower end of the vertical shaft is connected to an oil pump.

[0012] Preferably, the front end of the upper shaft is fixedly connected to an upper shaft bevel gear, and the upper shaft bevel gear is meshed with the upper bevel gear of the vertical shaft, and is used to drive the vertical shaft to rotate through the upper motor.

[0013] Preferably, the vertical shaft lower bevel gear and the lower shaft bevel gear are meshed with each other, the lower shaft bevel gear is fixedly connected to the rear end of the lower shaft, the front end of the lower shaft is fixedly connected to the shuttle bed, and the lower shaft bevel gear drives the lower shaft and the shuttle bed at the front end to rotate to cooperate with the movement of the needle.

[0014] Preferably, a presser foot frame is fixedly connected to the front end of the housing, and the upper cloth feeding wheel is rotatably connected to the presser foot frame.

[0015] Preferably, the cloth feeding spindle is fixed by a first shaft sleeve and a second shaft sleeve provided at the front end and the rear end.

[0016] Preferably, a foot switch is provided below the housing, and the foot switch is electrically connected to the electronic control program.

[0017] Preferably, the front end of the upper shaft is fixedly connected with a front sleeve, and a middle sleeve is provided in front of the winding crank for fixing the upper shaft.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a transmission structure in which a lower motor drives a small gear that meshes with a large gear of a cloth feed main shaft, and cooperates with a design in which a driving gear is connected to a universal shaft to connect an upper cloth feed wheel, and a lower gear is linked to a lower cloth feed shaft and a lower cloth feed gear, so that the upper and lower cloth feed wheels rotate at the same speed, forming a synchronous driving force for clamping the cloth, realizing parallel synchronous feeding, avoiding skewing or wrinkling of the cloth, and improving sewing accuracy.

[0020] The present invention arranges a first shaft sleeve and a second shaft sleeve at the front and rear ends of the cloth feed spindle, and uses a presser foot to fix the upper cloth feed wheel, thereby ensuring that there is no axial deviation when the cloth feed spindle rotates, and cooperates with the clamping force of the upper and lower cloth feed wheels to ensure that the cloth is smoothly transported in the horizontal direction, thereby enhancing the stability of the structure.

[0021] The present invention realizes automatic winding of the bottom thread by arranging a winding crank in the upper motor transmission chain and a linkage structure with the winder on the top of the casing, reduces manual operation procedures, and improves sewing efficiency.

[0022] The present invention uses a structure in which the needle bar crank at the front end of the upper shaft is hinged to the thread take-up rod, and the connecting rod connects the needle bar, and cooperates with the vertical shaft bevel gear transmission to drive the shuttle bed to rotate, so that the needle pierces, the thread take-up rod tightens the surface thread and the shuttle bed hooks the thread in coordination, ensuring that the lock stitch is tight and firm, and reducing the thread breakage rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is the overall structural assembly diagram of the present invention;

[0024] Figure 2 This is a three-dimensional schematic diagram of the cloth feeding spindle structure of the present invention;

[0025] Figure 3 This is a three-dimensional schematic diagram of the present invention installed in a sewing machine.

[0026] In the figure: 1. needle bar crank; 3. front sleeve; 4. upper shaft; 5. middle sleeve; 6. winding crank; 7. bobbin winder; 13. upper shaft bevel gear; 16. connector; 18. upper motor; 20. upper vertical shaft bevel gear; 21. vertical shaft; 24. lower vertical shaft bevel gear; 26. lower shaft bevel gear; 31. lower shaft; 33. shuttle bed; 34. small gear; 35. motor bushing; 36. lower motor; 37. large gear; 38. oil pump; 39. first bushing; 40. feed spindle; 41. fixing ring; 42. second bushing; 43. driving gear; 44. universal shaft; 46. presser foot; 47. upper feed wheel; 53. needle bar; 54. thread take-up lever; 55. lower gear; 56. lower feed shaft; 59. lower feed gear; 60. foot switch; 61. electronic control program. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Example 1:

[0029] See also Figure 2, the present invention provides a technical solution:

[0030] A dual-motor sewing machine comprising:

[0031] The housing has a lower motor 36 installed in the rear lower end of the housing. The front end of the motor shaft of the lower motor 36 is fixedly connected to a small gear 34 by screws. A motor shaft sleeve 35 is sleeved on the motor shaft. The small gear 34 is meshed with a large gear 37 on the cloth feeding spindle 40. The front end of the cloth feeding spindle 40 is fixedly connected to a driving gear 43 by screws. The driving gear 43 is connected to an upper cloth feeding wheel 47 via a universal shaft 44, so as to drive the upper cloth feeding wheel 47 to rotate.

[0032] The driving gear 43 on the cloth feed main shaft 40 is meshed with the lower gear 55, and the lower gear 55 is fixedly connected to the rear end of the lower cloth feed shaft 56. The front end of the lower cloth feed shaft 56 is fixedly connected and installed with a lower cloth feed gear 59. The lower cloth feed gear 59 rotates synchronously with the upper cloth feed wheel 47 to achieve parallel synchronous feeding.

[0033] In this embodiment, when the lower motor 36 drives the small gear 34 to rotate, the power is transmitted to the large gear 37 on the cloth feeding spindle 40 through gear meshing, so that the cloth feeding spindle 40 rotates at a constant speed.

[0034] The cloth feed spindle 40 rotates, driving the driving gear 43 at the front end of the cloth feed spindle 40 to rotate. On the one hand, the driving gear 43 is directly connected to the upper cloth feed wheel 47 through the universal joint 44, driving the upper cloth feed wheel 47 to rotate clockwise; on the other hand, the driving gear 43 engages with the lower gear 55, transmitting power to the lower cloth feed shaft 56, causing the lower cloth feed gear 59 at the front end of the lower cloth feed shaft 56 to rotate counterclockwise at the same speed, thereby achieving the upper cloth feed wheel 47 and the lower cloth feed gear 59 rotating at the same speed.

[0035] The upper cloth feeding wheel 47 and the lower cloth feeding gear 59 rotate synchronously and at the same speed, forming a synchronous driving force for clamping the cloth up and down, and realizing parallel synchronous feeding.

[0036] Specifically, by installing a lower motor 36 at the lower rear end of the casing, the small gear 34 installed on the motor shaft is driven to change the speed, giving the controller in the electronic control program 61 more reaction time, making the cloth feeding structure more stable.

[0037] Specifically, a presser foot frame 46 is fixedly connected to the front end of the housing, and the upper cloth feeding wheel 47 is rotatably connected to the presser foot frame 46 .

[0038] Specifically, the cloth feeding spindle 40 is fixed by a first shaft sleeve 39 and a second shaft sleeve 42 provided at the front end and the rear end.

[0039] The cloth feed spindle 40 is fixed by the first shaft sleeve 39 and the second shaft sleeve 42 at the front and rear ends to ensure that there is no axial deviation during rotation. The presser foot 46 presses the cloth tightly so that the cloth can be smoothly transported in the horizontal direction under the clamping of the upper and lower cloth feed wheels to avoid skewing or wrinkles caused by uneven force.

[0040] Specifically, the motor is fixedly connected to the sewing machine, or connected to the gear through a connector 16, etc., which is a conventional setting in the field of sewing machines and will not be described in detail here.

[0041] Specifically, the motor is preferably the Sequoia silent flat car energy-saving motor, which is a direct-drive servo motor, suitable for 220V high-head cars, wheelbarrows, fur machines, etc., and can meet the power and adaptability requirements of this dual-motor sewing machine.

[0042] Example 2:

[0043] See also Figure 1 The present invention provides a technical solution, which is basically the same as that of Example 1, with the following slight differences:

[0044] Specifically, such as Figure 2 An upper motor 18 is installed in the upper rear end of the casing. The upper motor 18 is connected to the upper shaft 4 through a connector 16. A winding crank 6 is fixedly connected to the middle of the upper shaft 4. A winder 7 is fixedly connected to the top of the casing. The winding crank 6 rotates to drive the winder 7 to wind the bottom line.

[0045] The upper motor 18 drives the upper shaft 4 to rotate through the connector 16, and the winding crank 6 in the middle of the upper shaft 4 rotates synchronously, driving the winder 7 on the top of the casing to complete the bottom thread winding, thereby realizing automatic winding.

[0046] Specifically, a needle bar crank 1 is installed at the front end of the upper shaft 4, and the front end of the needle bar crank 1 is hinged to the thread take-up rod 54. The thread take-up rod 54 is connected to the upper end of the needle bar 53 through a connecting rod structure, and the lower end of the needle bar 53 is fixed with the machine needle through a fixed sleeve. When the needle bar 53 drives the machine needle to move up and down at the specified position, the thread take-up rod 54 performs the thread taking action synchronously.

[0047] The needle bar crank 1 at the front end of the upper shaft 4 drives the needle bar 53 to drive the needle to move up and down within a fixed track through the hinged thread take-up rod 54 and the connecting rod structure. The thread take-up rod 54 performs the thread take-up action synchronously to tighten the upper thread in coordination with the rhythm of the needle piercing the fabric.

[0048] At the same time, the upper shaft bevel gear 13 at the front end of the upper shaft 4 meshes with the vertical shaft upper bevel gear 20 at the top of the vertical shaft 21, transmitting power to the vertical shaft 21, and the vertical shaft lower bevel gear 24 at the lower end of the vertical shaft 21 meshes with the lower shaft bevel gear 26, driving the lower shaft 31 and the front end shuttle bed 33 to rotate, so that the shuttle bed 33 thread hooking component is coordinated with the needle movement. After the needle with thread penetrates the fabric, the shuttle bed 33 hooks the upper thread to form a thread loop, and the thread take-up rod 54 tightens the upper thread and the bottom thread.

[0049] Specifically, a vertical shaft 21 is vertically installed in the rear end of the casing. The top and bottom of the vertical shaft 21 are fixedly connected to the vertical shaft upper bevel gear 20 and the vertical shaft lower bevel gear 24 respectively. The lower end of the vertical shaft 21 is connected to the oil pump 38.

[0050] Specifically, the front end of the upper shaft 4 is fixedly connected to an upper shaft bevel gear 13 , and the upper shaft bevel gear 13 is meshed with the vertical shaft upper bevel gear 20 to drive the vertical shaft 21 to rotate through the upper motor 18 .

[0051] Specifically, the vertical shaft lower bevel gear 24 is meshed with the lower shaft bevel gear 26. The lower shaft bevel gear 26 is fixedly connected to the rear end of the lower shaft 31. The front end of the lower shaft 31 is fixedly connected to the shuttle bed 33. The lower shaft bevel gear 26 drives the lower shaft 31 and the shuttle bed 33 at the front end to rotate to cooperate with the movement of the needle.

[0052] Specifically, the front end of the upper shaft 4 is fixedly connected to the front sleeve 3 , and the front of the winding crank 6 is provided with a middle sleeve 5 for fixing the upper shaft 4 .

[0053] Specifically, the motor is preferably the Sequoia silent flat car energy-saving motor, which is a direct-drive servo motor, suitable for 220V high-head cars, wheelbarrows, fur machines, etc., and can meet the power and adaptability requirements of this dual-motor sewing machine.

[0054] Example 3:

[0055] See also Figure 3 The present invention provides a technical solution that is basically the same as Example 2, with the following slight differences:

[0056] In this embodiment, Figure 3 The dual-motor sewing machine of Example 2 is installed in the casing, and a foot switch 60 is provided under the casing. The foot switch 60 is electrically connected to the electronic control program 61.

[0057] Specifically, the electronic control program 61 is preferably developed based on the STM32F4 series microcontroller. This series of chips has a high-performance ARMCortex-M4 core with a main frequency of up to 168MHz, which can meet the needs of multi-motor synchronous control, complex algorithm calculation and real-time response; it has rich timer resources and can accurately control the PWM output of the spindle motor and the cloth feed motor to realize the sewing machine's stitch length adjustment, front cloth feed / rear encryption stitch and other functions; it has sufficient I / O interfaces for connecting the sewing machine's foot switch 60, solenoid valve, cylinder and other peripherals, and supports the control of mechanical actions such as lifting the presser foot and opening and closing the sewing machine's reel.

[0058] When the present invention is in use, the operator first places the fabric between the presser foot 46 and the upper and lower feed wheels, and starts the electronic control program 61 by stepping on the foot switch 60. The electronic control program 61 will synchronously drive the upper motor 18 and the lower motor 36 to operate: the upper motor 18 drives the upper shaft 4 to rotate through the connector 16, so that the winder 7 automatically winds the bottom line, and at the same time the needle bar crank 1 drives the needle bar 53 to drive the needle to pierce the fabric up and down, the thread take-up rod 54 cooperates to tighten the surface thread, and the vertical shaft 21 drives the shuttle bed 33 to rotate and hook the thread through the bevel gear transmission; the lower motor 36 drives the upper and lower feed wheels to rotate synchronously in the opposite direction through the gear transmission, clamping the fabric and transporting it smoothly in the horizontal direction. The operator can adjust the angle of the foot switch 60 according to needs, and adjust the stitch length through the electronic control program 61 to complete sewing operations on parts such as trouser legs.

[0059] The remaining undescribed parts of the present invention may be the same as the prior art, or are well-known technologies, or can be implemented by using the prior art, and will not be described in detail here.

[0060] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A dual-motor sewing machine, characterized in that: include: A housing, wherein a lower motor (36) is installed in the rear lower end of the housing, a front end of the motor shaft of the lower motor (36) is fixedly connected to a small gear (34) by screws, a motor shaft sleeve (35) is sleeved on the motor shaft, the small gear (34) and the large gear (37) on the cloth feeding main shaft (40) are meshed with each other, the front end of the cloth feeding main shaft (40) is fixedly connected to a driving gear (43) by screws, and the driving gear (43) is connected to an upper cloth feeding wheel (47) via a universal shaft (44) and is used to drive the upper cloth feeding wheel (47) to rotate; The driving gear (43) on the cloth feeding main shaft (40) is meshed with the lower gear (55), and the lower gear (55) is fixedly connected to the rear end of the lower cloth feeding shaft (56). The front end of the lower cloth feeding shaft (56) is fixedly connected and installed with a lower cloth feeding gear (59). The lower cloth feeding gear (59) rotates synchronously with the upper cloth feeding wheel (47) to realize parallel synchronous feeding.

2. A dual-motor sewing machine according to claim 1, characterized in that: An upper motor (18) is installed in the upper rear end of the housing, and the upper motor (18) is connected to the upper shaft (4) through a connector (16). A winding crank (6) is fixedly connected to the middle of the upper shaft (4), and a winder (7) is fixedly connected to the top of the housing. The winding crank (6) rotates to drive the winder (7) to wind the bottom line.

3. A dual-motor sewing machine according to claim 2, characterized in that: A needle bar crank (1) is installed at the front end of the upper shaft (4), and the front end of the needle bar crank (1) is hinged to the thread take-up lever (54). The thread take-up lever (54) is connected to the upper end of the needle bar (53) through a connecting rod structure. The lower end of the needle bar (53) is fixedly mounted with a machine needle through a fixing sleeve. When the needle bar (53) drives the machine needle to move up and down at a specified position, the thread take-up lever (54) synchronously performs a thread take-up action.

4. A dual-motor sewing machine according to claim 3, characterized in that: A vertical shaft (21) is vertically installed in the rear end of the housing, and the top and bottom of the vertical shaft (21) are fixedly connected to a vertical shaft upper bevel gear (20) and a vertical shaft lower bevel gear (24), respectively. The lower end of the vertical shaft (21) is connected to an oil pump (38).

5. A dual-motor sewing machine according to claim 4, characterized in that: The front end of the upper shaft (4) is fixedly connected to an upper shaft bevel gear (13), and the upper shaft bevel gear (13) and the vertical shaft upper bevel gear (20) are meshed with each other and are used to drive the vertical shaft (21) to rotate through the upper motor (18).

6. A dual-motor sewing machine according to claim 5, characterized in that: The vertical shaft lower bevel gear (24) and the lower shaft bevel gear (26) are meshed with each other. The lower shaft bevel gear (26) is fixedly connected to the rear end of the lower shaft (31). The front end of the lower shaft (31) is fixedly connected to the shuttle bed (33). The lower shaft bevel gear (26) drives the lower shaft (31) and the shuttle bed (33) at the front end to rotate to cooperate with the movement of the needle.

7. The dual-motor sewing machine according to claim 1, characterized in that: A presser foot frame (46) is fixedly connected to the front end of the housing, and the upper cloth feeding wheel (47) is rotatably connected to the presser foot frame (46).

8. The dual-motor sewing machine according to claim 1, characterized in that: The cloth feeding spindle (40) is fixed by a first shaft sleeve (39) and a second shaft sleeve (42) provided at the front and rear ends.

9. The dual-motor sewing machine according to claim 1, characterized in that: A foot switch (60) is provided below the housing, and the foot switch (60) is electrically connected to the electric control program (61).

10. The dual-motor sewing machine according to claim 2, characterized in that: The front end of the upper shaft (4) is fixedly connected to a front sleeve (3), and a middle sleeve (5) is provided in front of the winding crank (6) for fixing the upper shaft (4).

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