A sewing machine

Abstract

The present application provides a sewing machine, which includes a frame, a feeding mechanism, a bobbin case, a first driving device, a sewing needle and a second driving device. The feeding mechanism is installed on the frame and is used for clamping the object to be sewn and moving it. The bobbin case is arranged below the feeding mechanism. The first driving device is connected to the bobbin case and can drive the bobbin case to perform a rotational motion. The sewing needle is arranged above the feeding mechanism. The second driving device is connected to the sewing needle and can drive the sewing needle to perform a lifting motion and also a swinging motion. During the process that the sewing needle pierces through the object to be sewn and then leaves the object to be sewn, the feeding mechanism clamps the object to be sewn and moves it at a uniform speed, and at the same time, the sewing needle swings along the feeding direction of the feeding mechanism, so that the sewing needle and the object to be sewn located on the feeding mechanism can move synchronously in the same direction. The present application mainly improves the sewing method and sewing quality of the existing sewing machine.

Description

Technical Field

[0001] The present invention belongs to the field of sewing machines, and more specifically, relates to a sewing machine. Background Art

[0002] Sewing machines in the prior art generally include a feeding mechanism, a sewing needle, and a bobbin case. The feeding mechanism can drive the fabric to move linearly or move arbitrarily within a plane so that the sewing needle can sew at the required position of the fabric. The sewing needle is located above the feeding mechanism, and the bobbin case is arranged below the feeding mechanism and corresponds to the position of the sewing needle in the vertical direction.

[0003] When sewing with the existing sewing machine, the feeding mechanism will first drive the fabric to move a certain distance and then stop, so that the position of the fabric to be sewn can be directly below the sewing needle. At this time, the sewing needle moves downward and passes through the stationary fabric. When the sewing needle reaches the lowest point, it will start to rise. When the sewing needle rises, it will hook the thread on the bobbin case. When the sewing needle completely leaves the fabric, the feeding mechanism drives the fabric to move again so that the next position of the fabric to be sewn can be below the sewing needle, and so on for cyclic operation.

[0004] As can be seen from the above, when using a sewing machine of the prior art, the feeding mechanism moves intermittently, that is, the feeding mechanism needs to continuously switch between starting and stopping. If the feeding mechanism has not stopped after the sewing needle passes through the fabric, the fabric on the feeding mechanism will directly break the sewing needle. Therefore, in order to improve the sewing efficiency of the fabric, the manufacturer can only improve the switching efficiency between the starting state and the stopping state of the feeding mechanism or improve the efficiency of the up-and-down movement of the sewing needle. However, the high-speed switching between the starting state and the stopping state of the feeding mechanism not only has to match the accuracy and stability of each sewing action, but also has very high requirements for the system, and will also cause large vibrations of the machine table. On the one hand, the vibrations will cause large wear of the components, reduce the service life of the parts, and increase the equipment maintenance cost. On the other hand, the vibrations of the machine table will directly affect the sewing accuracy of the fabric, and the generated vibrations may also break the sewing needle by the fabric. In this regard, the manufacturer can only reduce the switching speed between the starting state and the stopping state of the feeding mechanism and adopt a low-efficiency method to ensure the sewing quality and the stability of the machine movement. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a sewing machine, and the present application mainly improves the sewing method and sewing quality of the existing sewing machine.

[0006] To achieve the above object, the technical solution adopted in the present application is: providing a sewing machine, including a frame, and further including:

[0007] A feeding mechanism, which is mounted on the frame and is used to clamp the sewing object and move it;

[0008] A shuttle bed is arranged below the feeding mechanism;

[0009] A first driving device, connected to the shuttle bed and capable of driving the shuttle bed to rotate;

[0010] A sewing needle is arranged above the feeding mechanism;

[0011] The second driving device is connected to the sewing needle and can drive the sewing needle to move up and down and also to swing, so that the sewing needle can cooperate with the shuttle bed to hook the thread; in the process from the sewing needle piercing the object to be sewn to leaving the object to be sewn, the feeding mechanism clamps the object to be sewn to move at a uniform speed, and at the same time, the sewing needle swings in the direction of the uniform movement of the feeding mechanism, so that the sewing needle and the object to be sewn located on the feeding mechanism can move synchronously in the same direction.

[0012] In one of the embodiments, the feeding mechanism is an XY axis moving platform that can drive the object to be sewn to move arbitrarily on a plane; the frame is provided with a rotating shaft connected to the second driving device and arranged longitudinally, and the rotating shaft can drive the second driving device to rotate so that the swing direction of the sewing needle can be the same as the feeding direction of the feeding mechanism; the frame is also provided with a driving motor connected to the shuttle bed, and the driving motor can drive the shuttle bed to rotate synchronously in the same direction as the rotating shaft, so that the sewing needle can still cooperate with the shuttle bed to hook the thread after rotating around the rotating shaft.

[0013] In one of the embodiments, the feeding mechanism includes a Y-axis module installed on the frame, an X-axis module transmission-connected to the Y-axis module, and a clamping mechanism connected to the X-axis module; the Y-axis module can drive the X-axis module and the clamping mechanism to perform linear motion in the direction of the Y-axis; the X-axis module can drive the clamping mechanism to perform linear motion in the direction of the X-axis.

[0014] In one embodiment, the clamping mechanism includes a fixed frame and a lifting cylinder respectively fixed to the fixed ends of the X-axis module, and the clamping mechanism also includes a pressure block transmission-connected to the lifting cylinder, and the lifting cylinder can drive the pressure block to perform lifting motion, so that the fixed frame and the pressure block jointly clamp the object to be sewn.

[0015] In one embodiment, the first driving device includes a mounting base, a first motor and a transmission component; the mounting base is mounted on the output end of the driving motor; the first motor is fixed on the mounting base, and the output shaft of the first motor, the transmission component and the shuttle bed are sequentially connected, so that the first motor can drive the shuttle bed to rotate and the rotation axis of the shuttle bed is horizontally arranged.

[0016] In one embodiment, the transmission component is a synchronous belt transmission component.

[0017] In one embodiment, the second driving device includes a needle bar swing frame, a second motor, a crank and connecting rod assembly, a third motor, a swing arm, a slider and a needle bar; the sewing needle is mounted on the needle bar swing frame through the needle bar, and the output shaft of the second motor, the crank and connecting rod assembly and the needle bar are sequentially connected, so that the output shaft of the second motor can drive the sewing needle and the needle bar swing frame to make a lifting motion together through the transmission of the crank and connecting rod assembly; a swing center is provided at the top of the needle bar swing frame, a chute is provided on the needle bar swing frame, the slider is longitudinally slidably connected to the chute, the third motor is fixed to the machine frame and the output shaft of the third motor, the swing arm and the slider are sequentially connected, so that the third motor can drive the needle bar swing frame to swing around the swing center.

[0018] In one embodiment, the sewing machine further includes a presser bar and a presser foot for pre-pressing the object to be sewn; the presser foot is fixed on the presser bar, and the output shaft of the second motor is connected to the presser bar, so that the second motor can drive the presser bar to make a lifting motion.

[0019] In one embodiment, the driving motor is a torque motor.

[0020] Compared with the prior art, the beneficial effects of the sewing machine provided by the present application are as follows:

[0021] When the sewing machine of the present application is working, since the sewing needle moves synchronously in the same direction as the object to be sewn (such as cloth) after passing through the object to be sewn, therefore, the feeding mechanism on the sewing machine of the present technical solution can maintain a continuous and uniform motion state without stopping, so the machine frame will not vibrate greatly and runs very smoothly. At the same time, during the sewing process, there is almost no interaction force between the sewing needle and the object to be sewn, so the sewing needle will not be broken by the object to be sewn. The sewing machine adopting the present technical solution can greatly improve the sewing efficiency and ensure the stability of the sewing operation. Description of the Drawings

[0022] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 Structural schematic diagram of the sewing machine provided by the embodiment of the present application;

[0024] Figure 2 Structural schematic diagram of the sewing machine provided by the embodiment of the present application after removing the feeding mechanism;

[0025] Figure 3 Structural schematic diagram of the sewing machine provided by the embodiment of the present application after removing the frame and the feeding mechanism;

[0026] Figure 4 Motion schematic of the sewing needle during operation in the embodiment of the present application Figure 1 ;

[0027] Figure 5 Motion schematic of the sewing needle during operation in the embodiment of the present application Figure 2 ;

[0028] Figure 6 Motion schematic of the sewing needle during operation in the embodiment of the present application Figure 3 ;

[0029] Figure 7 Motion schematic of the sewing needle during operation in the embodiment of the present application Figure 4 ;

[0030] Figure 8 Motion schematic of the sewing needle during operation in the embodiment of the present application Figure 5 ;

[0031] Figure 9 Exploded view of the structure of the first driving device in the embodiment of the present application;

[0032] Figure 10 Exploded view of the structure of the second driving device in the embodiment of the present application.

[0033] Reference numerals are:

[0034] 1, frame;

[0035] 2, feeding mechanism; 21, Y-axis module; 22, X-axis module; 23, clamping mechanism; 231, fixed frame; 232, lifting cylinder; 233, pressing block;

[0036] 3, bobbin case;

[0037] 4. First driving device; 41. Mounting base; 42. First motor; 43. Transmission assembly;

[0038] 5. Sewing needle;

[0039] 6. Second driving device; 61. Needle swing frame; 611. Slide groove; 612. Swing center; 62. Second motor; 63. Crank and connecting rod assembly; 64. Third motor; 65. Swing arm; 66. Slide block; 67. Needle bar;

[0040] 7. Rotating shaft; 8. Driving motor; 9. Pressing bar; 10. Presser foot; 11. Position point. Detailed implementation manners

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0043] It should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present application.

[0044] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more unless otherwise specifically defined.

[0045] Please refer to Figures 1 - 3 for an illustration of the sewing machine provided by the embodiment of the present application. The sewing machine includes a frame 1, a feeding mechanism 2, a bobbin case 3, a first driving device 4, a sewing needle 5 and a second driving device 6.

[0046] Among them, the feeding mechanism 2 is installed on the frame 1. The feeding mechanism 2 functions to clamp the fabric and drive the fabric to move. In this embodiment, the feeding mechanism 2 is preferably an XY-axis moving platform with two-axis movement, that is, the feeding mechanism 2 can drive the fabric to move arbitrarily on a horizontal plane, so that the fabric can be moved to the required placement, thereby facilitating the sewing operation of the sewing needle 5 at a specified position on the fabric. In other embodiments, for fabrics that only need to be sewn along a straight line, the feeding mechanism 2 can also be a single-axis moving module.

[0047] Among them, the bobbin case 3 is a prior art. The bobbin case 3 is arranged below the feeding mechanism 2. The function of the bobbin case 3 is to be able to cooperate with the sewing needle 5.

[0048] Among them, the first driving device 4 can drive the bobbin case 3 to rotate to meet the cooperation between the bobbin case 3 and the sewing needle 5 and realize the conventional function of hooking the thread and tying a knot.

[0049] Among them, the sewing needle 5 is also a prior art. The sewing needle 5 is arranged above the feeding mechanism 2, and the sewing needle 5 and the bobbin case 3 are on the same vertical line, so that the sewing needle 5 can hook the thread on the bobbin case 3 when moving downward.

[0050] Among them, the output end of the second driving device 6 is connected to the sewing needle 5. The function of the second driving device 6 is to be able to drive the sewing needle 5 to swing while moving up and down. The second driving device 6 is also a prior art.

[0051] The core point of this application is that during the process of the sewing needle 5 piercing the fabric and leaving the fabric, the sewing needle 5 always swings along the same feeding direction of the fabric, so that there is almost no interaction force between the sewing needle 5 and the fabric. Therefore, during the sewing process, the feeding mechanism 2 is always in the starting state, thereby greatly improving the sewing efficiency.

[0052] Please refer to Figures 4 - 8 , the following paragraph is the working principle of this sewing machine:

[0053] Figure 4 is a schematic diagram of the initial state when the sewing needle 5 has not pierced the fabric. At this time, the position point 11 to be sewn on the fabric and the tip of the sewing needle 5 are not on the same vertical line. When starting to sew, the feeding mechanism 2 drives the fabric to start moving at a constant speed. At the same time, the second driving device 6 drives the sewing needle 5 to move downward and swing at the same time. At this time Figure 5 is a schematic diagram of the sewing needle 5 just piercing the position point 11 to be sewn on the fabric. Next, the feeding mechanism 2 does not stop driving, and the fabric still moves at a constant speed along the planned trajectory. At this time, the second driving device 6 still drives the sewing needle 5 to continue to descend and at the same time swing along the movement direction of the fabric, so that the fabric moving at a constant speed will not break the sewing needle 5. Immediately afterwards, the sewing needle 5 continues to descend to the lowest point (such asFigure 6 As shown, immediately afterwards, the second driving device 6 drives the sewing needle 5 to move upward and simultaneously drives the sewing needle 5 to continue to swing along the moving direction of the fabric (as Figure 7 shown). During the upward movement of the sewing needle 5, the sewing needle 5 hooks the thread on the lower bobbin case 3. Then the sewing needle 5 rises to a position where it is separated from the fabric (as Figure 8 shown). At this time, a knot will be formed on the fabric. Finally, the sewing needle 5 immediately resets to Figure 4 the original state. The above working process circulates in this way, and finally the required knots are sewn at each specified position on the fabric.

[0054] In summary, since the sewing needle 5 moves synchronously with the fabric on the feeding mechanism 2 in the same direction after passing through the fabric, therefore, the feeding mechanism 2 on the sewing machine of this technical solution can maintain a continuous and uniform motion state without stopping. So, the frame 1 will not have a large vibration and runs very smoothly. At the same time, during the sewing process, there is almost no interaction force between the sewing needle 5 and the fabric. So, the sewing needle 5 will not be broken by the fabric. The sewing machine adopting this technical solution can greatly improve the sewing efficiency and ensure the stability of the sewing operation.

[0055] It should be added that since the feeding mechanism 2 in this embodiment is an XY-axis moving platform, the feeding mechanism 2 can drive the fabric to move in any direction on the plane. In order to make the swinging angle of the sewing needle 5 keep the same as the moving direction of the fabric, a rotating shaft 7 is also provided on the frame 1 in this embodiment. The axis of the rotating shaft 7 is arranged vertically. The second driving device 6 is connected to the rotating shaft 7. The rotating shaft 7 can drive the second driving device 6 to rotate, thereby driving the sewing needle 5 to adjust the swinging direction according to the change of the fabric moving direction. Of course, the bobbin case 3 must also swing synchronously with the sewing needle 5 to ensure that the sewing needle 5 can accurately hook the thread on the bobbin case 3 during the upward movement after descending to the lowest point. Among them Figure 2 or Figure 3 the driving motor 8 installed on the frame 1 in

[0056] In another specific embodiment of the present application, please refer to Figure 1, the feeding mechanism 2 includes a Y-axis module 21, an X-axis module 22, and a clamping mechanism 23. Among them, the Y-axis module 21 is fixed on the frame 1, the X-axis module 22 is mounted on the Y-axis module 21, and the clamping mechanism 23 is installed on the X-axis module 22. The Y-axis module 21 can drive the X-axis module 22 and the clamping mechanism 23 to move linearly in the Y-axis direction, and the X-axis module 22 can drive the clamping mechanism 23 to move linearly in the X-axis direction. The function of the clamping mechanism 23 is to clamp the fabric. In this embodiment, the clamping mechanism 23 includes a fixed frame 231, a lifting cylinder 232, and a pressing block 233. The fixed frame 231 and the lifting cylinder 232 are respectively fixed at the output end of the X-axis module 22. The X-axis module 22 can drive the fixed frame 231 and the lifting cylinder 232 to move linearly in the X-axis direction as a whole, and the lifting cylinder 232 can drive the pressing block 233 to move downward, so that the pressing block 233 and the fixed frame 231 can jointly complete the clamping operation on the fabric.

[0057] In another specific embodiment of the present application, please refer to Figure 3 and Figure 9 , the first driving device 4 includes a mounting base 41, a first motor 42, and a transmission component 43. Among them, the mounting base 41 is fixed at the output end of the driving motor 8 (i.e., the torque motor in this embodiment), the first motor 42 is fixed on the mounting base 41, and the first motor 42 drives the shuttle bed 3 to rotate through the transmission component 43. When the shuttle bed 3 rotates, the rotation axis of the shuttle bed 3 is horizontally designed. In this embodiment, the transmission component 43 is preferably a synchronous belt transmission with relatively high transmission accuracy and stability. In other embodiments, the transmission component 43 can also be a lead screw transmission or a gear transmission with higher accuracy.

[0058] In another specific embodiment of the present application, please refer to Figure 3 and Figure 10, the second driving device 6 includes a pendulum needle holder 61, a second motor 62, a crank and connecting rod assembly 63, a third motor 64, a swing arm 65, a slider 66 and a needle bar 67. The sewing needle 5 is fixed to the bottom end of the needle bar 67. The second motor 62 is relatively fixed to the rotating shaft 7. The output shaft of the second motor 62, the crank and connecting rod assembly 63 and the needle bar 67 are connected in sequence, so that the output shaft of the second motor 62 can drive the sewing needle 5 and the pendulum needle holder 61 to move up and down together through the transmission of the crank and connecting rod assembly 63. In addition, a swing center 612 is provided at the top of the pendulum needle holder 61. A chute 611 is provided on the pendulum needle holder 61. The slider 66 is longitudinally slidably connected to the chute 611. The third motor 64 is also relatively fixed to the rotating shaft 7. The output shaft of the third motor 64, the swing arm 65 and the slider 66 are connected in sequence, so that the third motor 64 can drive the sewing needle 5 and the pendulum needle holder 61 to swing around the swing center 612 while moving up and down together. In addition, this sewing machine further includes a presser bar 9 and a presser foot 10. The presser foot 10 is fixed to the presser bar 9. The output shaft of the second motor 62 is connected to the presser bar 9. The second motor 62 can drive the presser bar 9 to move up and down, thereby driving the presser foot 10 to press the fabric tightly, avoiding the problem of fabric deviation during the sewing process of the sewing needle 5 on the fabric.

[0059] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A sewing machine comprising a frame (1), It is characterized in that Also includes: A feeding mechanism (2), the feeding mechanism (2) being mounted on the frame (1) and used for clamping the sewing object and moving it; A shuttle bed (3) is arranged below the feeding mechanism (2); A first driving device (4) connected to the shuttle bed (3) and capable of driving the shuttle bed (3) to perform rotational motion; A sewing needle (5) is arranged above the feeding mechanism (2); a second driving device (6) connected to the sewing needle (5) and capable of driving the sewing needle (5) to move up and down and to swing at the same time, so that the sewing needle (5) can cooperate with the shuttle bed (3) to hook the thread; in the process from when the sewing needle (5) pierces the object to be sewn to when it leaves the object to be sewn, the feeding mechanism (2) clamps the object to be sewn and moves at a uniform speed, and at the same time, the sewing needle (5) swings in the direction of the uniform movement of the feeding mechanism (2), so that the sewing needle (5) and the object to be sewn on the feeding mechanism (2) can move synchronously in the same direction; The feeding mechanism (2) is an XY axis moving platform capable of driving the object to be sewn to move arbitrarily on a plane; The frame (1) is provided with a rotating shaft (7) connected to the second driving device (6) and arranged with its axis longitudinally, and the rotating shaft (7) is capable of driving the second driving device (6) to rotate so that the swinging direction of the sewing needle (5) is the same as the feeding direction of the feeding mechanism (2); The frame (1) is also provided with a driving motor (8) connected to the shuttle bed (3), and the driving motor (8) can drive the shuttle bed (3) to perform a synchronous rotational movement in the same direction as the rotating shaft (7), so that the sewing needle (5) can still cooperate with the shuttle bed (3) to hook the thread after rotating around the rotating shaft (7): The feeding mechanism (2) comprises a Y-axis module (21) mounted on the frame (1), an X-axis module (22) drivingly connected to the Y-axis module (21), and a clamping mechanism (23) connected to the X-axis module (22); The Y-axis module (21) can drive the X-axis module (22) and the clamping mechanism (23) to perform linear motion in the direction of the Y-axis; and the X-axis module (22) can drive the clamping mechanism (23) to perform linear motion in the direction of the X-axis.

2. The sewing machine according to claim 1, Features: The clamping mechanism (23) comprises a fixed frame (231) and a lifting cylinder (232) respectively fixed to the fixed ends of the X-axis module (22); the clamping mechanism (23) further comprises a pressing block (233) drivingly connected to the lifting cylinder (232); the lifting cylinder (232) is capable of driving the pressing block (233) to perform lifting movement, so that the fixed frame (231) and the pressing block (233) jointly clamp the object to be sewn.

3. The sewing machine according to claim 1, Features: The first driving device (4) comprises a mounting seat (41), a first motor (42) and a transmission assembly (43); The mounting base (41) is mounted on the output end of the drive motor (8); the first motor (42) is fixed on the mounting base (41), and the output shaft of the first motor (42), the transmission assembly (43) and the shuttle bed (3) are connected in sequence, so that the first motor (42) can drive the shuttle bed (3) to rotate and the rotation axis of the shuttle bed (3) is horizontally arranged.

4. The sewing machine according to claim 3, wherein: the transmission assembly (43) is a synchronous belt transmission assembly.

5. The sewing machine according to claim 1, wherein: the second driving device (6) includes a needle swinging frame (61), a second motor (62), a crank and connecting rod assembly (63), a third motor (64), a swing arm (65), a slider (66) and a needle bar (67); the sewing needle (5) is mounted on the needle swinging frame (61) through the needle bar (67), and the output shaft of the second motor (62), the crank and connecting rod assembly (63) and the needle bar (67) are connected in sequence, so that the output shaft of the second motor (62) can drive the sewing needle (5) and the needle swinging frame (61) to perform lifting movements together through the transmission of the crank and connecting rod assembly (63); a swinging center (612) is provided at the top of the needle swinging frame (61), a chute (611) is provided on the needle swinging frame (61), the slider (66) is longitudinally slidably connected to the chute (611), and the output shaft of the third motor (64), the swing arm (65) and the slider (66) are connected in sequence, so that the third motor (64) can drive the needle swinging frame (61) to swing around the swinging center (612).

6. The sewing machine according to claim 5, wherein: the sewing machine further includes a presser bar (9) and a presser foot (10) for pre-pressing the object to be sewn; the presser foot (10) is fixed on the presser bar (9), and the output shaft of the second motor (62) is connected to the presser bar (9), so that the second motor (62) can drive the presser bar (9) to perform lifting movements.

7. The sewing machine according to claim 1, wherein: the drive motor (8) is a torque motor.

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