Stepping type multi-needle machine thread trimming device

Abstract

The utility model relates to clothing machinery, in particular to a thread trimming device of a stepping type multi-needle machine, which is characterized in that a stepping motor is adopted to replace a traditional pneumatic system, and reciprocating rectilinear motion of a driving plate is achieved. The device comprises main components such as a thread trimming mechanism, a stepping motor and a thread trimming driving mechanism, and the thread trimming action is completed through precise mechanical transmission. Compared with the prior art, the utility model has the advantages that the dependence on an external air source is obviously reduced, and the applicability and the reliability of equipment are improved.

Description

Technical Field

[0001] The utility model relates to a garment machine, in particular to a thread trimming device of a stepping multi-needle machine. Background Art

[0002] At present, the multi-needle machine thread trimming devices on the market are generally pneumatic types, such as a multi-needle automatic thread trimming mechanism previously disclosed by the applicant with publication number CN218115819U. The mechanism is fixed to the connecting arm of the thread trimming mechanism through a cylinder pull rod, and uses a gas source to provide stable air pressure to drive the retraction and extension of the cylinder pull rod, thereby driving the entire row of thread hooking knives to realize the thread cutting knife out and knife retraction action.

[0003] While pneumatic thread trimmers are easy to operate, they do have some significant limitations. First, they rely on a stable air supply, which is often a challenge for small garment processing companies, which may not be able to provide a continuous and stable air supply. Second, existing pneumatic devices also rely on solenoid valves to drive cylinders to achieve thread release and presser foot lifting, which is also limited by the stability and reliability of the air source.

[0004] Furthermore, pneumatic systems may require regular maintenance and calibration to ensure their performance and efficiency. This not only increases operating costs but can also impact production efficiency. Consequently, existing technologies lack adaptability and flexibility, particularly for smaller garment processing companies with limited resources. Utility Model Content

[0005] In order to reduce the dependence on the air source, this utility model proposes a stepping multi-needle machine thread trimming device, which is driven by a stepping motor. This not only reduces the procurement cost, but also reduces the energy consumption in daily operation, providing a cost-effective solution for small garment processing companies. The technical solution adopted by this utility model is:

[0006] A stepping multi-needle machine thread trimming device includes a thread trimming mechanism installed on a table below the head of the multi-needle machine, the thread trimming mechanism includes a drive plate, and unlike the prior art, a stepping motor is fixed on the frame at the tail of the multi-needle machine, and the stepping motor drives the drive plate to reciprocate linearly through the thread trimming drive mechanism; the thread trimming drive mechanism includes a first swing arm fixedly connected to the motor shaft of the stepping motor, and the free end of the first swing arm is fixedly connected to a first cylindrical pin with an axial direction in the up-down direction; a first guide rail with a stroke in the left-right direction is fixed on the frame of the multi-needle machine, and the first guide rail The first slider is slidably engaged with the first slider, the first slider is fixedly connected to the first connecting plate, the first connecting plate is transferred to a second swing arm, the second swing arm is provided with a first long hole, the first cylindrical pin is slidably engaged with the first long hole; the right end of the first connecting plate is fixedly connected to the extension plate, the free end of the extension plate is close to the thread cutting mechanism; the middle part of the V-shaped plate is transferred to the table under the head of the multi-needle machine, one end of the V-shaped plate is transferred to the free end of the extension plate, the other end of the V-shaped plate is transferred to one end of the second connecting plate, and the other end of the second connecting plate is transferred to the free end of the driving plate.

[0007] Furthermore, the thread cutting mechanism also includes a U-shaped bottom plate, a fixed knife is fixedly connected to the opening of the U-shaped bottom plate, and a plurality of movable knives are fixedly connected to the thread cutting connecting plate, and each movable knife forms a shearing pair with the fixed knife; the left and right ends of the thread cutting connecting plate are respectively fixedly connected to the front ends of the left slide and the right slide, and the left guide rail and the right guide rail are respectively matched with the left slider and the right slider, the left connecting plate is fixedly connected to the rear end of the left slider and the left slide, and the driving plate is fixedly connected to the rear end of the right slider and the right slide, wherein the rear end of the driving plate extends backward out of the U-shaped bottom plate, and a linear driving mechanism driven by a stepper motor is connected to the driving plate.

[0008] Furthermore, the thread trimming drive mechanism further includes a reset tension spring, one end of which is fixedly connected to the first connecting plate, and the other end of which is fixedly connected to the frame of the multi-needle machine.

[0009] Furthermore, it also includes a wire loosening drive mechanism, which includes a C-shaped connecting plate, the lower end of the C-shaped connecting plate is fixedly connected to the left end of the first connecting plate, and the upper end of the C-shaped connecting plate is fixedly connected to the second cylindrical pin; the cross bar gap passes through the multi-needle machine and is connected to it, the front end of the cross bar is fixedly connected to the sixth swing arm, the sixth swing arm has a second long hole, and the second cylindrical pin is slidably fitted with the second long hole; the rear end of the cross bar is fixedly connected to one end of the third swing arm, the other end of the third swing arm is fixedly connected to the wire loosening rod of the wire loosener, and the middle part of the third swing arm is connected to the bottom plate of the wire loosener.

[0010] Furthermore, it also includes a presser foot lifting mechanism, which includes a fourth swing arm fixedly connected to the motor shaft of the stepper motor, and the free end of the fourth swing arm is fixedly connected to a third cylindrical pin with an axial direction of the up and down direction; a second guide rail with a stroke in the left and right directions is fixed on the end cover of the stepper motor, and the second guide rail slidably cooperates with the second slider, and the second slider is fixed to an L-shaped connecting plate, and the left side of the L-shaped connecting plate abuts against the third cylindrical pin; the L-shaped connecting plate is connected to the lower end of the third connecting plate, and the upper end of the third connecting plate is fixed to the lower end of the seventh swing arm, the upper end of the seventh swing arm is connected to the left end of the fourth connecting plate, and the middle part of the seventh swing arm is connected to the body of the multi-needle machine; the right end of the fourth connecting plate is connected to the upper end of the fifth connecting plate, and the lower end of the fifth connecting plate is fixed to the presser foot rotating shaft extending out of the body of the multi-needle machine.

[0011] Furthermore, it also includes a line sweeping mechanism, which includes a mounting seat fixed to the presser foot rod, the mounting seat fixed to the mounting vertical plate, the mounting vertical plate fixed to a direct-push electromagnet, the push-pull rod of the direct-push electromagnet fixed to a push-pull head, and a third elongated hole is provided on the push-pull head; the middle part of the fifth swing arm is connected to the mounting vertical plate, the upper end of the fifth swing arm is fixed to a fourth cylindrical pin with an axial direction in the left and right direction, the fourth cylindrical pin enters the third elongated hole and slides with it; the lower end of the fifth swing arm is fixed to an L-shaped line sweeping rod, and the line sweeping rod is close to the presser foot.

[0012] Compared with the prior art, the beneficial technical effects of the present invention are:

[0013] Reduce dependence on air source: Since the stepper motor is used as the driving force, the thread trimming device no longer needs to rely on an external air source, thereby reducing dependence on the air source.

[0014] Reduced procurement costs: Compared with pneumatic systems, stepper motors and their control systems may have lower initial procurement costs, which can be an economical solution especially for small garment processing companies.

[0015] Reduced daily operating costs: Since the machine does not require a continuous air supply, it consumes less energy during daily operation, thus reducing operating costs.

[0016] Improved reliability: Stepper motor driven thread trimmers can provide more stable and reliable thread trimming action because they are not affected by fluctuations in air supply pressure.

[0017] Ease of maintenance: Stepper motor systems are generally simpler and require less maintenance than pneumatic systems, which can reduce maintenance time and costs.

[0018] Improve production efficiency: Due to the precise control of the stepper motor, the thread trimming device can achieve more accurate thread trimming action, thereby improving production efficiency and product quality.

[0019] Flexibility and adaptability: The design of the thread trimmer allows it to be used in garment processing companies of different sizes, especially for small or medium-sized companies that do not have a stable air supply.

[0020] Environmentally friendly: Reducing dependence on air sources also means reducing potential impact on the environment, as pneumatic systems may require more energy consumption.

[0021] Easy to integrate and upgrade: The stepper motor driven thread trimmer can be more easily integrated with the existing multi-needle machine system, while also facilitating future technology upgrades and improvements.

[0022] Improved safety: Since the use of pneumatic components is reduced, the risks caused by air leakage or other risks associated with pneumatic systems may be reduced.

[0023] These technical effects together provide small garment processing companies with an economical, efficient, reliable and easy-to-maintain thread cutting solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural diagram of the present utility model.

[0025] Figure 2 This is a structural diagram of the utility model from another perspective.

[0026] Figure 3 It is a structural diagram of the thread trimming mechanism of the present utility model.

[0027] Figure 4 This is a structural diagram of the thread trimming mechanism of the present invention from another perspective.

[0028] Figure 5 This is a structural diagram of the thread trimming drive mechanism of the present utility model.

[0029] Figure 6 This is a structural diagram of the thread trimming drive mechanism of the present invention from another perspective.

[0030] Figure 7 This is a structural diagram of the wire loosening drive mechanism of the utility model.

[0031] Figure 8 This is a structural diagram of the presser foot lifting mechanism of the present invention.

[0032] Figure 9 This is a structural diagram of the presser foot lifting mechanism of the utility model from another perspective.

[0033] Figure 10 It is a structural diagram of the wire sweeping mechanism of the present utility model.

[0034] Figure 11 This is a structural diagram of the wire sweeping mechanism of the present invention from another perspective.

[0035] Reference numerals in the figure: multi-needle machine 100, thread trimming mechanism 200, drive plate 201, stepper motor 300, thread trimming drive mechanism 400, first swing arm 401, first cylindrical pin 402, first guide rail 403, first slider 404, first connecting plate 405, second swing arm 406, second connecting plate 410, first elongated hole 407, extension plate 408, V-shaped plate 409, U-shaped bottom plate 202, fixed knife 203, thread trimming connecting plate 204, left slide plate 206, right slide plate 207, left guide rail 208, right guide rail 209, left slider 210, right slider 211, left connecting plate 212, reset spring 411, thread release drive mechanism 600, C-shaped connecting plate 601, Second cylindrical pin 602, crossbar 603, second swing arm 604, second elongated hole 605, third swing arm 606, thread releaser 500, thread release lever 501, presser foot lifter 700, fourth swing arm 701, third cylindrical pin 702, second guide rail 703, second slider 704, L-shaped connecting plate 705, third connecting plate 706, fourth swing arm 707, fourth connecting plate 708, fifth connecting plate 709, presser foot shaft 710, presser foot lever 711, presser foot 712, thread wiper 800, mounting base 801, mounting plate 802, direct-push electromagnet 803, push-pull rod 804, push-pull head 804, third elongated hole 806, fifth swing arm 805, Fourth cylindrical pin-807, sweeping rod-808. DETAILED DESCRIPTION

[0036] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0037] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0038] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can readily understand the other advantages and benefits of the present invention from the contents disclosed in this specification. Obviously, the embodiments described are only a portion of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are also within the scope of protection of the present invention.

[0039] like Figure 1-11 The thread trimming device of a stepping multi-needle machine shown in the figure includes a thread trimming mechanism 200 installed on a table below the head of the multi-needle machine 100, the thread trimming mechanism 200 includes a drive plate 201, a stepping motor 300 is fixed on the frame at the tail of the multi-needle machine 100, and the stepping motor 300 drives the drive plate 201 to reciprocate linearly through the thread trimming drive mechanism 400; the thread trimming drive mechanism 400 includes a first swing arm 401 fixed to the motor shaft of the stepping motor 300, and the free end of the first swing arm 401 is fixed to a first cylindrical pin 402 with an axial direction in the up-down direction; a first guide rail 403 with a stroke in the left-right direction is fixed on the frame of the multi-needle machine 100, and the first guide rail 403 slides with the first slider 4 04, the first slider 404 is fixed to the first connecting plate 405, the first connecting plate 405 is transferred to the second swing arm 406, the second swing arm 406 is provided with a first elongated hole 407, the first cylindrical pin 402 is slidably fitted with the first elongated hole 407; the right end of the first connecting plate 405 is fixed to the extension plate 408, the free end of the extension plate 408 is close to the thread trimming mechanism 200; the middle part of the V-shaped plate 409 is transferred to the table below the head of the multi-needle machine 100, one end of the V-shaped plate 409 is transferred to the free end of the extension plate 408, the other end of the V-shaped plate 409 is transferred to one end of the second connecting plate 410, and the other end of the second connecting plate 410 is transferred to the free end of the driving plate 201.

[0040] Upon receiving the thread trimming command, the stepper motor 300 starts and begins rotating. The rotation of the stepper motor 300 is powered by the thread trimming drive mechanism 400. The thread trimming drive mechanism 400 includes a first swing arm 401 fixed to the motor shaft. The free end of the first swing arm 401 slides in engagement with a first elongated hole 407 via a first cylindrical pin 402, driving the first slider 404 along the first guide rail 403. The movement of the first slider 404 drives the first connecting plate 405, which is then transmitted to the extension plate 408 via the second swing arm 406. The movement of the extension plate 408 is transmitted to the drive plate 201 via the V-shaped plate 409 and the second connecting plate 410, causing it to perform reciprocating linear motion. The linear motion of the drive plate 201 directly drives the thread trimming components within the thread trimming mechanism 200, completing the thread trimming operation. After thread trimming is complete, the stepper motor 300 stops, and a reset mechanism (such as a reset spring 411) resets the thread trimming mechanism 200, preparing for the next thread trimming operation. The use of a stepper motor drive reduces reliance on an external air supply, improving the adaptability and flexibility of the thread trimmer. Compared to traditional pneumatic thread trimmers, this system uses fewer pneumatic components, reducing procurement and maintenance costs. The precise control of the stepper motor ensures more accurate thread trimming, improving sewing quality. The electric thread trimmer reduces the potential for air pressure instability or leaks in pneumatic systems, enhancing the reliability of the trimming operation. The relatively simple electric system facilitates maintenance and troubleshooting. It is suitable for garment processing companies of all sizes, especially small ones, and can be flexibly integrated into existing multi-needle machine systems. The automated thread trimming process reduces manual intervention and improves production efficiency. It also reduces energy consumption and potential gas leaks, resulting in a lower environmental impact.

[0041] The thread trimming drive mechanism 400 further includes a reset spring 411, one end of which is fixed to the first connecting plate 405 and the other end is fixed to the frame of the multi-needle knitting machine 100. The reset spring 411 ensures that the thread trimming mechanism 200 can be quickly and accurately reset after thread trimming is completed, preparing for the next thread trimming operation.

[0042] The thread cutting mechanism 200 specifically includes a U-shaped bottom plate 202, a fixed knife 203 is fixed at the opening of the U-shaped bottom plate 202, and a plurality of movable knives 205 are fixed on the thread cutting connecting plate 204, each movable knife 205 and the fixed knife 203 forming a shearing pair; the left and right ends of the thread cutting connecting plate 204 are respectively fixed to the front ends of the left slide 206 and the right slide 207, a left guide rail 208 and a right guide rail 209 are fixed on the U-shaped bottom plate 202, and the left guide rail 208 and the right guide rail 209 are respectively matched with the left slider 210 and the right slider 211, the left connecting plate 212 is fixed to the rear end of the left slider 210 and the left slide 206, and the driving plate 201 is fixed to the rear end of the right slider 211 and the right slide 207, wherein the rear end of the driving plate 201 extends backward out of the U-shaped bottom plate 202, and a linear driving mechanism driven by a stepping motor is connected to the driving plate 201. The multiple movable knives 205 fixed on the thread trimming connecting plate 204 and the fixed knife 203 form a shearing pair. When the driving plate 201 moves, the slides 206 and 207 and the thread trimming connecting plate 204 are driven to move, thereby realizing the thread trimming action.

[0043] The thread trimming device of a stepping multi-needle machine in this embodiment further includes a thread loosening drive mechanism 600, comprising a C-shaped connecting plate 601, the lower end of which is fixedly connected to the left end of the first connecting plate 405 and the upper end of which is fixedly connected to a second cylindrical pin 602; a crossbar 603 which passes through the multi-needle machine 100 and is connected thereto; a front end of the crossbar 603 is fixedly connected to a sixth swing arm 604, which defines a second elongated hole 605, and the second cylindrical pin 602 slidably engages with the second elongated hole 605; a rear end of the crossbar 603 is fixedly connected to one end of a third swing arm 606, the other end of which is fixedly connected to the thread loosening rod 501 of the thread loosener 500, and the middle portion of the third swing arm 606 is connected to the bottom plate of the thread loosener 500. The stepping motor 300 starts and rotates, powered by the thread trimming drive mechanism 400. The power of the stepping motor 300 is transmitted to the C-shaped connecting plate 601 through the first connecting plate 405. The lower end of the C-shaped connecting plate 601 is fixedly connected to the first connecting plate 405, and its upper end is fixedly connected to the second cylindrical pin 602, which slides in the second elongated hole 605. The cross bar 603 passes through the multi-needle machine 100 and is switched therewith. The front end is fixedly connected to the sixth swing arm 604, which slides with the second cylindrical pin 602 through the second elongated hole 605 to achieve swinging. The rear end of the cross bar 603 is fixedly connected to one end of the third swing arm 606, and the other end of the third swing arm 606 is fixedly connected to the loosening rod 501 of the thread loosener 500, achieving swinging of the loosening rod 501. The swinging of the third swing arm 606 drives the loosening rod 501 of the thread loosener 500 to achieve tightness adjustment of the sewing thread. This loosening drive mechanism 600 does not require an external air source and is suitable for environments without a stable air supply. The precise control of the stepper motor 300 enables automated thread release, improving the automation level of the sewing process. This reduces maintenance and replacement costs caused by unstable air pressure or damaged pneumatic components. The electric drive reduces pressure fluctuations that can occur in pneumatic systems, improving overall system stability and reliability. The precise control capabilities of the stepper motor enable more accurate thread release, facilitating more refined sewing processes. The air-independent design makes the thread release drive mechanism adaptable to a wider range of working environments, including small or mobile sewing equipment. Accurate thread release control helps avoid sewing defects caused by improper thread tension, thereby improving the overall quality of the finished product. The electric drive simplifies system design, reduces the use of pneumatic piping and control components, and results in a more compact device. The electric thread release drive mechanism is easily integrated into the control systems of modern sewing machines, facilitating future technological upgrades and improvements.

[0044] A stepping multi-needle machine thread trimming device of this embodiment also includes a presser foot lifting mechanism 700, which includes a fourth swing arm 701 fixedly connected to the motor shaft of the stepping motor 300, and the free end of the fourth swing arm 701 is fixedly connected to a third cylindrical pin 702 with an axial direction in the up and down direction; a second guide rail 703 with a stroke in the left and right directions is fixed on the end cover of the stepping motor 300, and the second guide rail 703 is slidably matched with a second slider 704, and the second slider 704 is fixedly connected to an L-shaped connecting plate 705, and the L-shaped connecting plate 705 The left side of the L-shaped connecting plate 705 abuts against the third cylindrical pin 702; the L-shaped connecting plate 705 is connected to the lower end of the third connecting plate 706, the upper end of the third connecting plate 706 is fixedly connected to the lower end of the seventh swing arm 707, the upper end of the seventh swing arm 707 is connected to the left end of the fourth connecting plate 708, and the middle part of the seventh swing arm 707 is connected to the body of the multi-needle knitting machine 100; the right end of the fourth connecting plate 708 is connected to the upper end of the fifth connecting plate 709, and the lower end of the fifth connecting plate 709 is fixedly connected to the presser foot shaft 710 extending outside the body of the multi-needle knitting machine 100. The stepper motor 300 starts and rotates, and its motor shaft is directly fixed to the fourth swing arm 701. The rotation of the stepper motor 300 drives the fourth swing arm 701, the free end of which is fixedly connected to the third cylindrical pin 702. The second guide rail 703 fixed to the end cover of the stepper motor 300 slides in conjunction with the second slider 704, which is fixed to the L-shaped connecting plate 705. The left side of the L-shaped connecting plate 705 abuts the third cylindrical pin 702, thereby transmitting power to the swing arm system. The L-shaped connecting plate 705 is connected to the lower end of the third connecting plate 706, and the upper end of the third connecting plate 706 is fixed to the lower end of the seventh swing arm 707, forming a connecting rod mechanism to transmit power. The upper end of the seventh swing arm 707 is connected to the left end of the fourth connecting plate 708, and the right end of the fourth connecting plate 708 is connected to the upper end of the fifth connecting plate 709. The lower end of the fifth connecting plate 709 is fixed to the presser foot shaft 710, which enables the presser foot to be raised or lowered. The precise control capability of the stepper motor 300 makes the lifting and lowering of the presser foot more accurate, improving sewing precision. The electric drive method does not rely on an external air source, is suitable for a variety of working environments, and reduces dependence on pneumatic systems. The automated presser foot lift reduces manual labor, speeds up the sewing process, and improves production efficiency. Electric systems are less prone to failure than pneumatic systems, reducing maintenance costs and complexity. This mechanism can adapt to different thicknesses and types of sewing materials, increasing the versatility of the equipment. The electric drive simplifies the mechanical structure, eliminating the need for pneumatic piping and control components, making the equipment more compact. The electric system reduces the pressure fluctuations that can occur in pneumatic systems, improving equipment stability. The electric presser foot lifter is easily integrated into modern sewing machine control systems, facilitating future technology upgrades and improvements.

[0045] A step-by-step multi-needle machine thread trimming device in this embodiment also includes a thread sweeping mechanism 800, which includes a mounting seat 801 fixed to the presser foot rod 711, the mounting seat 801 is fixed to the mounting vertical plate 802, the mounting vertical plate 802 is fixed to a direct-push electromagnet 803, the push-pull rod of the direct-push electromagnet 803 is fixed to a push-pull head 804, and a third elongated hole 806 is provided on the push-pull head 804; the middle part of the fifth swing arm 805 is connected to the mounting vertical plate 802, the upper end of the fifth swing arm 805 is fixed to a fourth cylindrical pin 807 with an axial direction in the left and right direction, the fourth cylindrical pin 807 enters the third elongated hole 806 and slides with it; the lower end of the fifth swing arm 805 is fixed to an L-shaped thread sweeping rod 808, and the thread sweeping rod 808 is close to the presser foot 712. The direct-push electromagnet 803 drives the push-pull head 804 through its push-pull rod 804, and the push-pull head 804 is provided with a third elongated hole 806. The third elongated hole 806 of the push-pull head 804 slides with the fourth cylindrical pin 807 of the fifth swing arm 805, allowing the swing arm to swing left and right. When the direct-push electromagnet 803 is activated, the push-pull rod 804 pushes the push-pull head 804, thereby causing the fifth swing arm 805 to swing. The lower end of the fifth swing arm 805 is fixedly connected to the L-shaped thread-wiping rod 808, and the swinging of the swing arm drives the thread-wiping rod 808 to move. The thread-wiping rod 808 moves near the presser foot 712, sweeping the loose thread ends after sewing to under the presser foot, thereby realizing the thread-wiping function. Since the thread-wiping mechanism 800 adopts an electric drive, it does not require an external air source, so that the thread-wiping mechanism can be used in an environment without an air supply, thereby improving the applicability of the equipment. The electric design eliminates the need for pneumatic components, reducing maintenance and replacement costs due to unstable air pressure or damaged pneumatic components. The electric drive reduces pressure fluctuations that can occur in pneumatic systems, improving overall system stability and reliability. The precise control capabilities of the electric drive enable more accurate thread sweeping, enabling more refined sewing processes. The air-independent design makes the thread sweeping mechanism adaptable to a wider range of working environments, including small or mobile sewing equipment. Automated thread sweeping reduces manual operation, speeds up production, and improves efficiency. Loose threads are removed promptly to prevent them from interfering with subsequent sewing operations, improving the overall quality of the finished product. The electric drive simplifies the mechanical structure, eliminating the need for pneumatic piping and control components, resulting in a more streamlined machine. The electric thread sweeping mechanism easily integrates with modern sewing machine control systems, facilitating future technological upgrades and improvements. Automated thread sweeping reduces direct operator contact with the sewing machine, reducing operational risks.

[0046] Although the present invention has been described in detail above using general descriptions and specific embodiments, it will be apparent to those skilled in the art that modifications or improvements may be made to the present invention. Therefore, such modifications or improvements, without departing from the spirit of the present invention, are within the scope of protection claimed herein.

[0047] Any matters not described in detail in the present invention are prior art or common knowledge in the field.

Claims

1. A thread trimming device for a stepping multi-needle machine, comprising a thread trimming mechanism (200) mounted on a table below a machine head of the multi-needle machine (100), wherein the thread trimming mechanism (200) comprises a driving plate (201), characterized in that: A stepper motor (300) is fixed on a frame at the tail of the multi-needle machine (100), and the stepper motor (300) drives the drive plate (201) to reciprocate linearly through a thread trimming drive mechanism (400); the thread trimming drive mechanism (400) includes a first swing arm (401) fixedly connected to the motor shaft of the stepper motor (300), and the free end of the first swing arm (401) is fixedly connected to a first cylindrical pin (402) with an axial direction in the up-down direction; a first guide rail (403) with a stroke in the left-right direction is fixed on the frame of the multi-needle machine (100), and the first guide rail (403) is slidably matched with a first slider (404), and the first slider (404) is fixedly connected to a first connecting plate (405), and the first connecting plate (405) is fixedly connected to the first connecting plate (405). A second swing arm (406) is provided, a first elongated hole (407) is provided on the second swing arm (406), and the first cylindrical pin (402) is slidably engaged with the first elongated hole (407); the right end of the first connecting plate (405) is fixedly connected to the extension plate (408), and the free end of the extension plate (408) is close to the thread trimming mechanism (200); the middle part of the V-shaped plate (409) is provided on the table below the head of the multi-needle machine (100), one end of the V-shaped plate (409) is connected to the free end of the extension plate (408), the other end of the V-shaped plate (409) is connected to one end of the second connecting plate (410), and the other end of the second connecting plate (410) is connected to the free end of the driving plate (201).

2. A thread trimming device for a step-by-step multi-needle machine according to claim 1, characterized in that: The thread cutting mechanism (200) further comprises a U-shaped bottom plate (202), a fixed knife (203) being fixedly connected to the opening of the U-shaped bottom plate (202), a plurality of movable knives (205) being fixedly connected to the thread cutting connecting plate (204), each movable knife (205) forming a cutting pair with the fixed knife (203); the left and right ends of the thread cutting connecting plate (204) being fixedly connected to the front ends of the left slide plate (206) and the right slide plate (207), respectively; a left guide rail (208) and a right guide rail (209) being fixedly provided on the U-shaped bottom plate (202). 9), the left guide rail (208) and the right guide rail (209) are respectively matched with a left slider (210) and a right slider (211), the left connecting plate (212) is fixedly connected to the rear ends of the left slider (210) and the left slide plate (206), the driving plate (201) is fixedly connected to the rear ends of the right slider (211) and the right slide plate (207), wherein the rear end of the driving plate (201) extends backward outside the U-shaped bottom plate (202), and a linear driving mechanism driven by a stepping motor is connected to the driving plate (201).

3. The thread trimming device of a step-by-step multi-needle machine according to claim 1, characterized in that: The thread trimming drive mechanism (400) further includes a reset spring (411), one end of which is fixedly connected to the first connecting plate (405), and the other end of which is fixedly connected to the frame of the multi-needle machine (100).

4. The thread trimming device of a step-by-step multi-needle machine according to claim 1, characterized in that: The invention also includes a loosening wire driving mechanism (600), wherein the loosening wire driving mechanism (600) includes a C-shaped connecting plate (601), the lower end of the C-shaped connecting plate (601) is fixedly connected to the left end of the first connecting plate (405), and the upper end of the C-shaped connecting plate (601) is fixedly connected to the second cylindrical pin (602); a cross bar (603) passes through the multi-needle machine (100) and is connected to it, and the front end of the cross bar (603) is fixedly connected to the sixth swing arm (604). ), the sixth swing arm (604) is provided with a second elongated hole (605), and the second cylindrical pin (602) is slidably matched with the second elongated hole (605); the rear end of the cross bar (603) is fixedly connected to one end of the third swing arm (606), the other end of the third swing arm (606) is fixedly connected to the wire loosening rod (501) of the wire loosener (500), and the middle part of the third swing arm (606) is connected to the bottom plate of the wire loosener (500).

5. The thread trimming device of a step-by-step multi-needle machine according to claim 1, characterized in that: The presser foot lifting mechanism (700) further comprises a fourth swing arm (701) fixedly connected to the motor shaft of the stepping motor (300), the free end of the fourth swing arm (701) being fixedly connected to a third cylindrical pin (702) having an axial direction in the up-down direction; a second guide rail (703) having a stroke in the left-right direction is fixedly provided on the end cover of the stepping motor (300), the second guide rail (703) being slidably matched with a second slider (704), the second slider (704) being fixedly connected to an L-shaped connecting plate (705), the left side of the L-shaped connecting plate (705) being aligned with the third cylindrical pin (702). The pin (702) is abutted; the L-shaped connecting plate (705) is connected to the lower end of the third connecting plate (706); the upper end of the third connecting plate (706) is fixedly connected to the lower end of the seventh swing arm (707); the upper end of the seventh swing arm (707) is connected to the left end of the fourth connecting plate (708); the middle part of the seventh swing arm (707) is connected to the body of the multi-needle machine (100); the right end of the fourth connecting plate (708) is connected to the upper end of the fifth connecting plate (709); the lower end of the fifth connecting plate (709) is fixedly connected to the presser foot shaft (710) extending outside the body of the multi-needle machine (100).

6. The thread trimming device of a step-by-step multi-needle machine according to claim 1, characterized in that: The invention also includes a line sweeping mechanism (800), wherein the line sweeping mechanism (800) includes a mounting seat (801) fixedly connected to the presser foot rod (711), the mounting seat (801) is fixedly connected to the mounting vertical plate (802), the mounting vertical plate (802) is fixedly connected to the direct push type electromagnet (803), the push-pull rod of the direct push type electromagnet (803) is fixedly connected to the push-pull head (804), and the push-pull head (804) is provided with a third long strip hole (806); the middle part of the mounting vertical plate (802) is connected to the fifth swing arm (805), the upper end of the fifth swing arm (805) is fixedly connected to a fourth cylindrical pin (807) with an axial direction in the left and right directions, and the fourth cylindrical pin (807) enters the third long strip hole (806) and slides with it; the lower end of the fifth swing arm (805) is fixedly connected to an L-shaped line sweeping rod (808), and the line sweeping rod (808) is close to the presser foot (712).

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