Thread trimming device for sewing machine
By designing a thread cutting device for sewing machines, the automatic cutting and collection of wire harnesses are achieved using electric cylinder-driven grab hooks and tangent components, the problem of inconsistent thread cutting is solved by manually cutting and cutting the thread head processing, and the sewing effect and cleanliness of the working environment are improved.
Patent Information
- Application Number
- CN202422168430.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-04
- Publication Date
- 2025-06-27
- Estimated Expiration
- 2034-09-04
AI Technical Summary
In existing sewing processing, manual hand-held scissors cut threads on the thread harness after sewing, which consumes a lot of effort and inconsistent thread processing, resulting in poor sewing effect.
A thread cutting device for sewing machines is designed to tighten the wire through an electric cylinder driving the grapple hook. The tangent assembly includes a fixing frame, a slide chute, a screw, a slider, a lifting plate and a tangent knife to achieve precise cutting and collection of the wire harness.
The automatic processing of thread tips is realized, which reduces the energy consumption of manual operation, ensures the uniformity of thread tips and improves the sewing effect, and improves the working environment and reduces safety hazards.
Smart Images
Figure CN223033632U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sewing equipment, and particularly relates to a thread cutting device for a sewing machine. Background Technique
[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so as to interweave or sew together one or more layers of sewing materials. Sewing machines can sew fabrics such as cotton, linen, silk, wool, and artificial fibers, as well as products such as leather, plastic, and paper. The stitches sewn are neat, beautiful, flat and firm, the sewing speed is fast, and it is easy to use. And it has derived art forms such as hand embroidery and computer embroidery.
[0003] In the traditional clothing manufacturing and textile industries, the sewing process is a crucial step, which directly affects the product quality and production efficiency. However, in the existing sewing process, there is still a situation where manual scissors are used to cut the thread bundle after sewing. This not only consumes a lot of energy, but also there are inconsistent thread end treatments, resulting in poor sewing effects. Content of the Utility Model
[0004] In view of this, the utility model provides a thread cutting device for a sewing machine. The wire is tightened by driving a hook through an electric cylinder, and then the tightened wire bundle is cut by a tangent component. The tangent knives arranged up and down in a staggered manner ensure the cutting effect, and a collecting component in the tangent component is provided to collect the cut wire bundle, solving the problems of wire end collection and treatment, significantly improving the working environment, and reducing the work interference and potential safety hazards caused by wire end residues.
[0005] To solve the above technical problems, the utility model provides a thread cutting device for a sewing machine, including a sewing table and a sewing device. A thread cutting mechanism for assisting the sewing device is arranged on the sewing table. The thread cutting mechanism includes a wire pulling component and a tangent component;
[0006] The wire pulling component includes an electric cylinder arranged on the sewing table, and a hook is connected to the end of the telescopic shaft of the electric cylinder; the tangent component includes a fixed frame arranged on the sewing table and two chutes symmetrically arranged on the bottom surface of the sewing table. Guide rods are symmetrically arranged in the fixed frame, and a lifting plate is slidably arranged on the guide rods. A main tangent knife is fixedly arranged at the bottom of the lifting plate. A screw rod is rotatably arranged in each chute, a slider is slidably arranged on the screw rod, an installation frame is connected between the two sliders, a tangent groove is fixedly arranged on the installation frame, and a secondary tangent knife is fixedly arranged in the tangent groove. The wire is tightened by driving the hook through the electric cylinder to prepare for thread cutting. The use of the electric cylinder enables this process to be executed quickly and accurately. In addition, the tangent component includes a fixed frame, chutes, screw rods, sliders, a lifting plate, and main and secondary tangent knives, which are used to achieve precise cutting of the wire bundle. The main tangent knife is fixed at the bottom of the lifting plate, while the secondary tangent knife is located in the tangent groove that can be lifted. The two work together to ensure the cutting effect.
[0007] The top of the fixing frame is provided with a hydraulic push rod for pushing the lifting plate to move up and down. The end of the telescopic shaft of the hydraulic push rod is connected to the top surface of the lifting plate, providing power for the lifting plate through the hydraulic push rod to make the tangent process more stable and controllable.
[0008] At the bottom of each chute, there is a servo motor for driving the screw to rotate. The end of the output shaft of the servo motor is connected to the bottom of the screw, providing power for the screw in the chute through the servo motor. The rotation of the screw drives the slider and the mounting bracket, indirectly controlling the tangent action to ensure accurate positioning and efficient operation.
[0009] The tangent assembly is also provided with a collecting component for gathering the wire harness. The collecting component includes a collecting channel arranged on the mounting bracket. On one side of the collecting channel, there is a wire harness box. A collecting box is slidably arranged inside the wire harness line. Above the collecting box, there is a scraping plate fixedly arranged on the inner wall of the wire harness box. An electrostatic roller is rotatably arranged inside the collecting channel. One end of the electrostatic roller is rotatably arranged on the side wall of the wire harness box through a bearing and extends through the scraping plate and the wire harness box into the collecting channel. A handle is fixedly arranged on the side wall of the electrostatic roller. On the side wall of the collecting channel, there is a rotating motor for driving the electrostatic roller to rotate. The end of the output shaft of the rotating motor is connected to the tail end of the electrostatic roller through a coupling. Below the collecting channel, there is an exhaust fan. The input end of the exhaust fan is connected with an air guiding pipe. The tail end of the air guiding pipe is connected with the collecting channel through a flow guiding cover. The collecting component is used to collect the cut wire heads to keep the working environment clean. The exhaust fan provides suction to move the cut wire harness into the collecting channel. When passing through the rotating electrostatic roller, it is adsorbed by the electrostatic roller. When the sewing work is completed, by pulling the handle, the electrostatic roller is disengaged from the rotating motor, and the wire harness on the electrostatic roller is scraped by the scraping plate to make it fall into the collecting box to achieve the collection work of the wire harness.
[0010] In summary, compared with the prior art, the present application includes at least one of the following beneficial technical effects:
[0011] 1. When tangent is required, the telescopic shaft is driven through the internal mechanism of the electric cylinder, so that the hook at the end grabs the wire head and properly tightens it to prepare for the subsequent tangent operation.
[0012] 2. The lifting plate moves up and down under the action of the hydraulic push rod to adjust the position of the main tangent knife to ensure correct alignment with the wire harness. Then, the screws in the two side chutes are each driven to rotate by the servo motor, driving the slider to slide along the chute, and further adjusting the position of the mounting bracket and the tangent groove, so that the secondary tangent knife also reaches the optimal cutting position. When the main tangent knife and the secondary tangent knife correspond to each other, the wire harness is cut.
[0013] 3. The exhaust fan starts. Through the cooperation of the air deflector and the air draft pipe, negative pressure is generated to draw the wire harness in the tangent slot, and then it is adsorbed by the rotating static roller to prevent the wire ends from flying. The wire harness adsorbed on the surface of the static roller is sorted and removed by the scraper to ensure that they fall into the collection box in the wire harness box in an orderly manner. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 is a schematic structural view of the thread cutting device for a sewing machine of the present utility model;
[0015] Figure 2 is a front view of the present utility model;
[0016] Figure 3 is Figure 2 a schematic cross-sectional view of the F-axis as the actual cutting axis in
[0017] Figure 4 is a left view of the present utility model;
[0018] Figure 5 is Figure 4 a schematic cross-sectional view of the E-axis as the cross-sectional axis in
[0019] Figure 6 is Figure 4 an enlarged schematic view of the structure at A in
[0020] Description of the reference numerals: 1, sewing table; 2, sewing equipment; 3, thread cutting mechanism; 4, wire pulling assembly; 41, electric cylinder; 42, grab hook; 5, tangent assembly; 501, fixed frame; 502, guide rod; 503, lifting plate; 504, main tangent knife; 505, hydraulic push rod; 506, chute; 507, screw; 508, servo motor; 509, slider; 510, mounting frame; 511, tangent slot; 512, secondary tangent knife; 6, collection component; 601, collection channel; 602, wire harness box; 603, collection box; 604, scraper; 605, static roller; 606, handle; 607, rotating motor; 608, exhaust fan; 609, air draft pipe; 610, air deflector. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying Figures 1-6 drawings of the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present utility model fall within the scope of protection of the present utility model.
[0022] As Figures 1-6As shown in the figure: This embodiment provides a thread cutting device for a sewing machine, which includes a sewing table 1 and a sewing device 2. A thread cutting mechanism 3 for assisting the sewing device 2 is provided on the sewing table 1. The thread cutting mechanism 3 includes a wire pulling assembly 4 and a tangent assembly 5;
[0023] The wire pulling assembly 4 includes an electric cylinder 41 provided on the sewing table 1, and a hook 42 is connected to the end of the telescopic shaft of the electric cylinder 41; the tangent assembly 5 includes a fixed frame 501 provided on the sewing table 1 and two chutes 506 symmetrically arranged on the bottom surface of the sewing table 1. Guide rods 502 are symmetrically arranged inside the fixed frame 501, and a lifting plate 503 is slidably arranged on the guide rods 502. A main tangent knife 504 is fixedly arranged at the bottom of the lifting plate 503. A screw rod 507 is rotatably arranged in each chute 506, and a slider 509 is slidably arranged on the screw rod 507. An installation frame 510 is connected between the two sliders 509. A tangent slot 511 is fixedly arranged on the installation frame 510, and a secondary tangent knife 512 is fixedly arranged in the tangent slot 511. The wire pulling action of the wire is completed by driving the hook 42 through the electric cylinder 41 to prepare for wire cutting. The use of the electric cylinder 41 enables this process to be executed quickly and accurately. In addition, the fixed frame 501, chute 506, screw rod 507, slider 509, lifting plate 503, and main and secondary tangent knives 512 included in the tangent assembly 5 are used to achieve precise cutting of the wire harness. The main tangent knife 504 is fixed at the bottom of the lifting plate 503, while the secondary tangent knife 512 is located in the tangent slot 511 that can be lifted and lowered. The two work together to ensure the cutting effect.
[0024] As Figure 1 and Figure 2 shown, a hydraulic push rod 505 for pushing the lifting plate 503 to lift and lower is provided at the top of the fixed frame 501. The end of the telescopic shaft of the hydraulic push rod 505 is connected to the top surface of the lifting plate 503. The hydraulic push rod 505 provides power for the lifting plate 503 to make the tangent process more stable and controllable.
[0025] As Figure 2 、 Figure 3 and Figure 4 shown, a servo motor 508 for driving the screw rod 507 to rotate is provided at the bottom of each chute 506. The end of the output shaft of the servo motor 508 is connected to the bottom of the screw rod 507. The servo motor 508 provides power for the screw rod 507 in the chute 506. The rotation of the screw rod 507 drives the slider 509 and the installation frame 510 to indirectly control the tangent action to ensure precise positioning and efficient operation.
[0026] As Figure 4 、 Figure 5 and Figure 6 As shown, a collection component 6 for gathering wire harnesses is further provided on the tangent component 5. The collection component 6 includes a collection channel 601 provided on the mounting frame 510. A wire harness box 602 is provided on one side of the collection channel 601. A collection box 603 is slidably arranged inside the wire harness. Above the collection box 603, a scraping plate 604 is fixedly provided. The scraping plate 604 is arranged on the inner wall of the wire harness box 602. An electrostatic roller 605 is rotatably arranged inside the collection channel 601. One end of the electrostatic roller 605 is rotatably arranged on the side wall of the wire harness box 602 through a bearing and extends through the scraping plate 604 and the wire harness box 602 into the collection channel 601. A handle 606 is fixedly provided on the side wall of the electrostatic roller 605. A rotary motor 607 for driving the electrostatic roller 605 to rotate is fixedly provided on the side wall of the collection channel 601. The end of the output shaft of the rotary motor 607 is connected to the tail end of the electrostatic roller 605 through a coupling. An exhaust fan 608 is fixedly provided below the collection channel 601. The input end of the exhaust fan 608 is connected with an air duct. The tail end of the air duct is connected to the collection channel 601 through a flow guide cover. A blocking net needs to be installed at the connection between the collection channel 601 and the air duct to block the wire harness and prevent the wire harness from entering the exhaust fan 608. The cut wire heads are collected through the collection component 6 to keep the working environment clean. The exhaust fan 608 provides suction to move the cut wire harness into the collection channel 601. When passing through the rotating electrostatic roller 605, it is adsorbed by the electrostatic roller 605. When finishing the sewing work, by pulling the handle 606, the electrostatic roller 605 is disengaged from the rotary motor 607, and the wire harness on the electrostatic roller 605 is scraped by the scraping plate 604 to fall into the collection box 603 to achieve the collection work of the wire harness.
[0027] Usage method of the utility model: The electric cylinder 41 is used to drive the grab hook 42 to grasp the thread end, and the sewing thread is tightened through the telescopic action to prepare for cutting. Then, the hydraulic push rod 505 is used to push the lifting plate 503 to move up and down, so that the main cutting knife 504 can be accurately positioned at the position where cutting is required. The screw rod 507 located in the sliding groove 506 is driven to rotate by the servo motor 508, driving the slider 509 to move, so that the secondary cutting knife 512 corresponds to the main cutting knife 504, realizing the cutting work of the wire harness. Subsequently, by starting the exhaust fan 608, through the cooperation of the flow guide cover and the air duct, negative pressure is generated to suck the wire harness towards the static roller 605, and the thread end is adsorbed by the static electricity generated on its surface to prevent scattering. The scraper 604 is used to help sort and remove the wire harness to ensure that they enter the collection box 603 in the wire harness box 602 in an orderly manner. In addition, it should be noted that in the description of the present utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0028] The above is the preferred embodiment of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle described in the present utility model, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present utility model.
Claims
1. A thread trimming device for a sewing machine, comprising a sewing table (1) and a sewing device (2), characterized in that: The sewing table (1) is provided with a thread cutting mechanism (3) for assisting the sewing equipment (2), and the thread cutting mechanism (3) comprises a thread pulling assembly (4) and a thread cutting assembly (5); The wire pulling assembly (4) comprises an electric cylinder (41) arranged on the sewing table (1), and a grab hook (42) is connected to the end of the telescopic shaft of the electric cylinder (41); the wire cutting assembly (5) comprises a fixed frame (501) arranged on the sewing table (1) and two slide grooves (506) symmetrically arranged on the bottom surface of the sewing table (1), a guide rod (502) is symmetrically arranged in the fixed frame (501), a lifting plate (503) is slidably arranged on the guide rod (502), a main wire cutting knife (504) is fixedly arranged at the bottom of the lifting plate (503), a screw rod (507) is rotatably arranged in each of the slide grooves (506), a slider (509) is slidably arranged on the screw rod (507), a mounting frame (510) is connected between the two sliders (509), a wire cutting groove (511) is fixedly arranged on the mounting frame (510), and a secondary wire cutting knife (512) is fixedly arranged in the wire cutting groove (511).
2. The thread trimming device for a sewing machine according to claim 1, characterized in that: A hydraulic push rod (505) for pushing the lifting plate (503) to move up and down is provided on the top of the fixing frame (501), and the end of the telescopic shaft of the hydraulic push rod (505) is connected to the top surface of the lifting plate (503).
3. The thread trimming device for a sewing machine according to claim 1, characterized in that: A servo motor (508) for driving the screw rod (507) to rotate is provided at the bottom of each slide groove (506), and the output shaft end of the servo motor (508) is connected to the bottom of the screw rod (507).
4. The thread trimming device for a sewing machine according to claim 1, characterized in that: The wire cutting assembly (5) is also provided with a collecting component (6) for collecting the wire harness.
5. The thread trimming device for a sewing machine according to claim 4, characterized in that: The collecting component (6) comprises a collecting channel (601) arranged on the mounting frame (510), a wiring harness box (602) is arranged on one side of the collecting channel (601), a collecting box (603) is slidably arranged inside the wiring harness box (602), a scraper (604) is fixedly arranged above the collecting box (603), and the scraper (604) is arranged on the inner wall of the wiring harness box (602).
6. The thread trimming device for a sewing machine according to claim 5, characterized in that: An electrostatic roller (605) is rotatably provided in the collecting channel (601), one end of the electrostatic roller (605) is rotatably provided on the side wall of the harness box (602) via a bearing, and extends through the scraper (604) and the harness box (602) to the collecting channel (601), and a handle (606) is fixedly provided on the side wall of the electrostatic roller (605).
7. The thread trimming device for a sewing machine according to claim 6, characterized in that: A rotating motor (607) for driving the electrostatic roller (605) to rotate is fixedly provided on the side wall of the collecting channel (601), and the output shaft end of the rotating motor (607) is connected to the tail end of the electrostatic roller (605) via a coupling.
8. The thread trimming device for a sewing machine according to claim 7, characterized in that: An exhaust fan (608) is fixedly arranged below the collecting channel (601), and an air duct is connected to the input end of the exhaust fan (608), and the tail end of the air duct is connected to the collecting channel (601) via a guide cover.