Double motor sewing machine

Abstract

The utility model provides a kind of double motor sewing machine, including shell, lower motor is installed in the lower end inside shell back, the motor shaft front end of lower motor is connected with pinion, motor shaft sleeve is set on motor shaft, pinion and the large gear on the cloth feeding main shaft are mutually engaged, the drive gear is connected in the front end of cloth feeding main shaft, and the upper cloth feeding wheel is installed in drive gear by universal shaft connection;The drive gear on the cloth feeding main shaft and lower gear are mutually engaged, and lower gear is fixedly connected in the rear end of lower cloth feeding shaft, and lower cloth feeding gear is installed in the front end of lower cloth feeding shaft connection.The utility model, by setting the transmission structure that lower motor drives pinion and the large gear of cloth feeding main shaft engages, cooperate drive gear and universal shaft connection upper cloth feeding wheel, lower gear linkage lower cloth feeding shaft and lower cloth feeding gear, make upper and lower cloth feeding wheel rotate at the same speed, form the synchronous driving force of clamping cloth, realize parallel synchronous feeding, avoid cloth skew or wrinkle, improve sewing precision.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically a dual-motor sewing machine. Background Technology

[0002] A sewing machine is a machine that uses mechanical or electronic devices to drive a needle and thread to sew fabric together, quickly and accurately completing complex stitches that are difficult to achieve by hand. It works by having the needle pierce the fabric, interlacing with the bobbin (bottom thread) to form a lockstitch, significantly improving sewing efficiency. It is widely used in garment making, home textiles, and industrial production. Household sewing machines offer diverse functions (such as straight stitching, overlocking, and embroidery), while industrial models emphasize high speed and durability, making them core tools in modern textiles and home crafting.

[0003] In existing technologies, the feeding mechanism of traditional sewing machines mostly uses a single motor drive or simple gear transmission. On the one hand, the single motor simultaneously undertakes the sewing execution and feeding drive functions, and uneven power distribution can easily lead to fluctuations in feeding speed. Especially when dealing with scenarios such as trouser hems that require dense stitches, problems such as fabric skewing and wrinkles often occur due to asynchronous feeding. On the other hand, the fixing method of the feeding spindle lacks a positioning structure, and axial offset is common. Combined with the transmission ratio error of the upper and lower feeding wheels, it is difficult to achieve parallel and synchronous feeding of the fabric, resulting in inconsistent stitch density and affecting product quality. Utility Model Content

[0004] The purpose of this invention is to provide a dual-motor sewing machine to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A dual-motor sewing machine, comprising:

[0007] The machine housing has a lower motor installed inside its lower rear end. A small gear is fixedly connected to the front end of the motor shaft of the lower motor by screws. A motor shaft sleeve is fitted on the motor shaft. The small gear meshes with a large gear on the main feeding shaft. A drive gear is fixedly connected to the front end of the main feeding shaft by screws. An upper feeding wheel is connected to the drive gear through a universal joint and used to drive the upper feeding wheel to rotate.

[0008] The drive gear on the main feeding shaft meshes with the lower gear. The lower gear is fixedly connected to the rear end of the lower feeding shaft. The lower feeding gear is fixedly connected to the front end of the lower feeding shaft. The lower feeding gear rotates synchronously with the upper feeding wheel to achieve parallel synchronous feeding.

[0009] Preferably, an upper motor is installed inside the upper rear end of the housing. The upper motor is connected to an upper shaft via a connector. A winding crank is fixedly connected to the middle of the upper shaft. A winder is fixedly connected to the top of the housing. When the winding crank rotates, it drives the winder to wind the bottom thread.

[0010] Preferably, a needle bar crank is installed at the front end of the upper shaft, the front end of the needle bar crank is hinged to the thread take-up lever, the thread take-up lever 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 fixing sleeve. When the needle bar drives the needle to move up and down at a designated position, the thread take-up lever performs a thread take-up action simultaneously.

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

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

[0013] Preferably, the lower bevel gear on the vertical shaft meshes with the lower bevel gear on the lower shaft. The lower bevel gear on the lower shaft is fixedly connected to the rear end of the lower shaft, and a shuttle bed is fixedly connected to the front end of the lower shaft. The lower bevel gear on the lower shaft drives the lower shaft and the shuttle bed at the front end to rotate in coordination 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 feed roller is rotatably connected inside the presser foot frame.

[0015] Preferably, the fabric feeding spindle is fixed to the second bushing via a first bushing at the front end and a second bushing at the rear end.

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

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

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This invention features a transmission structure in which a small gear driven by a lower motor meshes with a large gear on the fabric feeding shaft. This, combined with a design that connects the upper and lower fabric feeding wheels to the drive gear and a universal joint, and links the lower gear to the lower fabric feeding shaft and the lower fabric feeding gear, allows the upper and lower fabric feeding wheels to rotate at the same speed. This creates a synchronous driving force that clamps the fabric, achieving parallel and synchronous feeding, preventing fabric skewing or wrinkling, and improving sewing accuracy.

[0020] This invention, by setting a first bushing and a second bushing at the front and rear ends of the main feeding shaft and fixing the upper feeding wheel with a presser foot, ensures that there is no axial displacement when the main feeding shaft rotates. Combined with the clamping force of the upper and lower feeding wheels, the fabric is smoothly conveyed in the horizontal direction, enhancing the stability of the structure.

[0021] This invention achieves automated bobbin winding by setting a winding crank in the upper motor drive chain and a winding device linked to the top of the machine housing, thereby reducing manual operation steps and improving sewing efficiency.

[0022] This invention utilizes a structure in which the needle bar crank at the front end of the upper shaft is hinged to the take-up lever and the connecting rod connects to the needle bar. Combined with the vertical shaft bevel gear transmission to drive the shuttle bed to rotate, the needle piercing, the take-up lever tightening the thread, and the shuttle bed hooking the thread work together to ensure that the locking stitch is tight and secure, reducing the thread breakage rate. Attached Figure Description

[0023] Figure 1 This is the overall structural assembly drawing of this utility model;

[0024] Figure 2 This is a three-dimensional schematic diagram of the fabric feeding spindle structure of this utility model;

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

[0026] In the diagram: 1. Needle bar crank; 3. Front sleeve; 4. Upper shaft; 5. Middle sleeve; 6. Winding crank; 7. Winder; 13. Upper shaft bevel gear; 16. Connector; 18. Upper motor; 20. Vertical shaft upper bevel gear; 21. Vertical shaft; 24. Vertical shaft lower bevel gear; 26. Lower shaft bevel gear; 31. Lower shaft; 33. Shuttle; 34. Small gear; 35. Motor bushing; 36. Lower motor; 37. Large gear; 38. Oil pump; 39. First bushing; 40. Fabric feeding spindle; 41. Fixing ring; 42. Second bushing; 43. Drive gear; 44. Universal joint; 46. Presser foot; 47. Upper fabric feeding wheel; 53. Needle bar; 54. Take-up lever; 55. Lower gear; 56. Lower fabric feeding shaft; 59. Lower fabric feeding gear; 60. Foot switch; 61. Electrical control program. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example 1:

[0029] Please see Figure 2 This utility model provides a technical solution:

[0030] A dual-motor sewing machine, comprising:

[0031] The housing has a lower motor 36 installed inside its lower rear end. 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 fitted on the motor shaft. The small gear 34 meshes with a large gear 37 on the main feeding shaft 40. The front end of the main feeding shaft 40 is fixedly connected to a drive gear 43 by screws. The drive gear 43 is connected to an upper feeding wheel 47 via a universal joint 44 for driving the upper feeding wheel 47 to rotate.

[0032] The drive gear 43 on the main feeding shaft 40 meshes with the lower gear 55. The lower gear 55 is fixedly connected to the rear end of the lower feeding shaft 56. The lower feeding shaft 56 has a lower feeding gear 59 fixedly connected to the front end. The lower feeding gear 59 rotates synchronously with the upper feeding 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 feeding spindle 40 through gear meshing, so that the feeding spindle 40 rotates at a constant speed.

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

[0035] The upper feeding roller 47 and the lower feeding gear 59 rotate synchronously and at the same speed, forming a synchronous driving force that clamps the fabric from the top and bottom, thus achieving parallel synchronous feeding.

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

[0037] Specifically, a presser foot bracket 46 is fixedly connected to the front end of the housing, and the upper feed roller 47 is rotatably connected inside the presser foot bracket 46.

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

[0039] The fabric feeding spindle 40 is fixed to the first bushing 39 and the second bushing 42 at the front and rear ends to ensure no axial deviation during rotation. It works with the presser foot 46 to press the fabric, so that the fabric is smoothly conveyed in the horizontal direction under the clamping of the upper and lower feeding wheels, avoiding skewing or wrinkles caused by uneven force.

[0040] Specifically, the motor is fixedly connected inside the sewing machine, or connected to the gears via connector 16, which is a standard setup in the sewing machine industry and will not be elaborated further here.

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

[0042] Example 2:

[0043] Please see Figure 1 This utility model provides a technical solution that is basically the same as that in Embodiment 1, with slight differences:

[0044] Specifically, such as Figure 2 An upper motor 18 is installed inside the upper rear end of the housing. 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 housing. When the winding crank 6 rotates, it drives the winder 7 to wind the bottom thread.

[0045] The upper motor 18 drives the upper shaft 4 to rotate through the connector 16. The winding crank 6 in the middle of the upper shaft 4 rotates synchronously, driving the winding device 7 at the top of the housing to complete the bottom wire winding, thus realizing automated winding.

[0046] Specifically, a needle bar crank 1 is installed at the front end of the upper shaft 4. 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 installed with a fixing sleeve. When the needle bar 53 drives the needle to move up and down at a designated position, the thread take-up lever 54 performs a thread take-up action simultaneously.

[0047] The needle bar crank 1 at the front end of the upper shaft 4 drives the needle bar 53 to move the needle up and down within a fixed trajectory through the hinged thread take-up lever 54 and connecting rod structure. The thread take-up lever 54 simultaneously performs the thread take-up action, tightening the top thread in rhythm with the needle piercing the fabric.

[0048] At the same time, the upper bevel gear 13 at the front end of the upper shaft 4 meshes with the upper bevel gear 20 at the top of the vertical shaft 21, transmitting power to the vertical shaft 21. The lower bevel gear 24 at the lower end of the vertical shaft 21 then meshes with the lower bevel gear 26, driving the lower shaft 31 and the front shuttle bed 33 to rotate. This causes the hooking part of the shuttle bed 33 to cooperate with the movement of the needle. After the needle carries the thread through the fabric, the shuttle bed 33 hooks the top thread to form a loop, and the take-up rod 54 tightens the top thread and the bottom thread.

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

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

[0051] Specifically, the vertical shaft lower bevel gear 24 and the lower shaft bevel gear 26 mesh with each other. The lower shaft bevel gear 26 is fixedly connected to the rear end of the lower shaft 31, and 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 in coordination with the movement of the needle.

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

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

[0054] Example 3:

[0055] Please see Figure 3 This utility model provides a technical solution that is basically the same as that in Embodiment 2, with slight differences:

[0056] In this embodiment, as Figure 3 The machine housing contains a dual-motor sewing machine as described in Embodiment 2. A foot switch 60 is located below the machine housing and 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 ARM Cortex-M4 core with a main frequency of up to 168MHz, which can meet the requirements of multi-motor synchronous control, complex algorithm calculation and real-time response. It has abundant timer resources, which can accurately control the PWM output of the spindle motor and the feed motor to realize the sewing machine's stitch length adjustment, front feed / rear densification stitch and other functions. It has sufficient I / O interfaces to connect 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 drum.

[0058] In use, the operator first places the fabric between the presser foot 46 and the upper and lower feed rollers. By stepping on the foot switch 60, the operator starts the electronic control program 61, which synchronously drives the upper motor 18 and the lower motor 36. The upper motor 18 drives the upper shaft 4 to rotate through the connector 16, causing the thread winder 7 to automatically wind the bobbin thread. At the same time, the needle crank 1 drives the needle bar 53 to drive the needle to pierce the fabric up and down. The thread take-up lever 54 helps to tighten the top thread, while 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 rollers to rotate synchronously in opposite directions through the gear transmission, clamping the fabric and conveying it smoothly in the horizontal direction. The operator can adjust the angle of the foot switch 60 as needed and adjust the stitch length through the electronic control program 61 to complete the sewing work on parts such as trouser hems.

[0059] All other parts of this utility model not described herein are the same as existing technology, or are known technology, or can be implemented using existing technology, and will not be described in detail here.

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

Claims

1. A double motor sewing machine characterized by, include: The housing has a lower motor (36) installed inside the lower rear end. 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 fitted on the motor shaft. The small gear (34) meshes with a large gear (37) on the main feeding shaft (40). The front end of the main feeding shaft (40) is fixedly connected to a drive gear (43) by screws. The drive gear (43) is connected to an upper feeding wheel (47) via a universal joint (44) for driving the upper feeding wheel (47) to rotate. The drive gear (43) on the main feeding shaft (40) meshes with the lower gear (55). The lower gear (55) is fixedly connected to the rear end of the lower feeding shaft (56). The lower feeding gear (59) is fixedly connected to the front end of the lower feeding shaft (56). The lower feeding gear (59) rotates synchronously with the upper feeding wheel (47) to achieve parallel synchronous feeding.

2. The dual-motor sewing machine according to claim 1, characterized in that: An upper motor (18) is installed inside the upper rear end of the housing. 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 housing. The winding crank (6) rotates, driving the winder (7) to wind the bottom thread.

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

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

5. A dual-motor sewing machine according to claim 4, characterized in that: The upper shaft (4) is fixedly connected to the front end of the upper shaft bevel gear (13), which meshes with the upper shaft bevel gear (20) of the vertical shaft and is 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) meshes 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 in order to cooperate with the movement of the needle.

7. A dual-motor sewing machine according to claim 1, characterized in that: A presser foot bracket (46) is fixedly connected to the front end of the housing, and the upper feed roller (47) is rotatably connected inside the presser foot bracket (46).

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

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

10. A 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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