Automatic thread trimming double-needle machine

Abstract

The utility model relates to the technical field of sewing machine heads, and discloses an automatic thread trimming double-needle machine which comprises a machine head and two thread trimming mechanisms, limiting rods are fixedly arranged on the two sides of the machine head in an axial symmetry mode respectively, a position driving device is arranged in the middle of the lower end of the machine head in a sliding mode, and an electric cylinder is fixedly arranged in the center of the lower end of the position driving device. A pressing plate is fixedly arranged at the lower end of the electric cylinder, a pressing air rod is fixedly arranged at the rear middle position of the upper end of the pressing plate, the pressing air rod penetrates through the interior of the pressing plate, and the rear end of the pressing air rod is fixedly connected with two air pipes. According to the double-needle machine, through cooperation of the lifting motor, the rotating shaft and other components and meshing transmission of the bevel gears and the lead screw, stable lifting of the two thread trimming mechanisms is achieved, the remaining amount after thread ends are trimmed is flexibly adjusted, thread trimming operation is simplified through the linkage design of the telescopic air rod and the cutter, work efficiency and finished product quality are improved, and the double-needle machine is suitable for popularization and application. The scissors type structure of the cutter effectively reduces abrasion and improves durability.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machine heads, in particular to a double-needle sewing machine with automatic thread trimming. Background Art

[0002] A double-needle sewing machine, also known as a double-needle lockstitch machine, is a sewing machine designed specifically to improve sewing efficiency and quality. Its core feature is that it has two needle bars that can sew synchronously or sequentially, thus forming two parallel and regular seams on the fabric. This sewing method not only enhances the firmness of the sewing, but also makes the appearance of the finished product more refined and beautiful. Double-needle sewing machines are widely used in many fields such as clothing manufacturing, home textile products, and shoe and hat processing. They are especially used in situations where double-thread stitching is required to enhance durability or decorative effects, such as the side seams of jeans, cuffs and hems of shirts, and edges of curtains. Compared with traditional single-needle sewing machines, double-needle sewing machines exhibit higher work efficiency in mass production, can significantly shorten production cycles, and reduce labor intensity. Double-needle sewing machines equipped with automatic thread trimming function can improve sewing efficiency and the quality of finished products. Automatic thread trimming can ensure that the length of the thread ends is consistent and neat after each sewing, avoiding entanglement and clutter caused by excessive thread ends. It also reduces the time and labor intensity of manual thread trimming, making the production process smoother, improving the continuity of the operation and the beauty of the sewing line.

[0003] After searching, an existing patent (publication number: CN213571036U) discloses an "automatic thread trimming double-needle machine, comprising a main body support plate, an upper drive housing fixedly mounted on the top of the main body support plate, and side fixing plates fixedly mounted on both sides of the main body support plate, a limit rod fixedly sleeved in the side fixing plate, a limit ring fixedly mounted on the bottom end of the limit rod, and a sliding plate fixedly mounted in the middle of the lower surface of the main body support plate. By disposing a drive cylinder in the middle of the fixing plate, and utilizing a hollow ventilation pipe to transmit power between the cutting knife and the drive cylinder, when thread trimming is required, the corrugated pipe is used to inflate the drive cylinder, thereby driving the cutting knife to move, thereby completing the purpose of thread trimming. In order to improve the user comfort of the device, two buffer plates are provided on both sides of the fixing plate to cushion the impact force of the cutting knife, thereby ensuring the structural safety of the cutting knife and improving the practicality of the device."

[0004] In the process of implementing this application, the inventor discovered the following problems in the prior art: Although the aforementioned comparative patent provides a double-needle machine with automatic thread trimming by providing components such as a main support plate, an upper drive housing, a side fixing plate, a limit rod, a limit ring, a sliding plate, a drive cylinder, a hollow vent pipe, a cutting knife, and a corrugated pipe, it is unable to adjust the length of the remaining thread after trimming. This makes it difficult to meet the user's need to adjust the remaining thread after trimming to adapt to the characteristics of sewing threads of different thicknesses and materials. Therefore, those skilled in the art have provided a double-needle machine with automatic thread trimming to solve the problems raised in the above background technology. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art and to propose an automatic thread trimming double-needle machine. The double-needle machine realizes the smooth lifting and lowering of the two thread trimming mechanisms through the cooperation of components such as the lifting motor and the rotating shaft, and the meshing transmission of multiple bevel gears and lead screws, and flexibly adjusts the remaining amount of the thread after shearing. The linkage design of the telescopic gas rod and the cutter simplifies the thread trimming operation, improves work efficiency and product quality, and the scissor-type structure of the cutter effectively reduces wear and improves durability.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an automatic thread-trimming double-needle machine, comprising a machine head and two thread-trimming mechanisms, wherein limit rods are fixedly arranged on both sides of the machine head in an axially symmetrical manner, a position driving device is slidingly arranged in the middle of the lower end of the machine head, an electric cylinder is fixedly arranged in the center of the lower end of the position driving device, a pressure plate is fixedly arranged at the lower end of the electric cylinder, a pressing gas rod is fixedly arranged at the rear middle position of the upper end of the pressure plate, the pressing gas rod passes through the interior of the pressure plate and is fixedly connected to two air pipes at the rear end, the two air pipes pass through and are fixedly connected to the lower middle position of the rear ends of the two thread-trimming mechanisms, the lower end of the machine head is axially symmetrically fixed with the position driving device as the axis, and the two thread-trimming mechanisms both include vertical frames.

[0007] Furthermore, the upper ends of the two vertical frames are fixedly arranged at the lower end of the position driving device near the four corners in an axisymmetric manner, and a motor is fixedly arranged at the rear middle position of the lower end of the position driving device.

[0008] Furthermore, a rotating shaft is rotatably arranged at the lower position inside the two vertical frames, and vertical bevel gears are fixedly installed through the two rotating shaft bodies in an axially symmetrical manner near the two ends. The rear positions of the two rotating shaft bodies are respectively connected to the output end of the motor through synchronous wheels and synchronous belts.

[0009] Furthermore, two screw rods are axially symmetrically arranged inside the lower ends of the two vertical frames and are rotatable therethrough. Horizontal bevel gears are fixedly arranged at the center positions of the upper ends of the four screw rods, and the four vertical bevel gears are respectively engaged with the four horizontal bevel gears.

[0010] Furthermore, a cross plate is threadedly sleeved on the middle and lower positions of the rod body of each of the four screw rods in two groups, and the lower ends of the two cross plates are fixedly connected to a square frame through a connecting rod, and the square frame is hollow in design.

[0011] Furthermore, two cutters are respectively arranged near the middle of the inner side of the two frames through a rotating shaft, and the middle position of the back side of the four cutter blades is ball-hinged with a telescopic gas rod, and the other ends of the four telescopic gas rods are respectively passed through and fixed to the front and rear middle positions inside the two frames.

[0012] Furthermore, the four cutters in the two boxes are arranged in groups of two in a scissor-like structure and are rotatably connected via rotating shafts.

[0013] The utility model has the following beneficial effects:

[0014] 1. The utility model proposes a double-needle sewing machine with automatic thread trimming. The coordinated use of the lifting motor and two rotating shafts and other components of the double-needle sewing machine, as well as the meshing transmission design of four vertical bevel gears, four horizontal bevel gears and four lead screws, ensure the smooth lifting and lowering of the thread trimming mechanism, reduce mechanical wear, and extend the service life of the machine. It allows the user to easily adjust the length of the thread end after thread trimming according to actual needs, so that the machine can adapt to fabrics of different materials and thicknesses, as well as thread end lengths with different sewing requirements.

[0015] 2. The utility model proposes a double-needle machine with automatic thread trimming. The linkage design of the four telescopic air rods and the two cutters of the double-needle machine, combined with the design of the pressing air rod, simplifies the thread trimming operation. The user only needs to press simply to complete the thread trimming, making the thread trimming action faster and more accurate, improving the convenience of operation and work efficiency, and avoiding the problems of uneven thread lengths and loose thread ends that may occur in traditional manual thread trimming, thereby improving the overall quality of the sewn products and further improving the working performance of the machine. In addition, the scissor-type design effectively avoids structural vibration and wear caused by blade collision compared to the design disclosed in the existing patent that uses a cylinder to drive the cutter to fly, thereby increasing the service life of the cutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an axonometric diagram of the present utility model;

[0017] Figure 2 This is an axonometric diagram of the thread trimming mechanism of the present invention;

[0018] Figure 3This is an axonometric diagram of the thread trimming mechanism of the present invention when viewed from the rear end;

[0019] Figure 4 For the utility model Figure 2 An enlarged schematic diagram of the structure at location A.

[0020] Legend:

[0021] 1. Machine head; 2. Limit rod; 3. Lifting motor; 4. Position drive device; 5. Electric cylinder; 6. Pressing plate; 7. Needle lowering device; 8. Pressing gas rod; 9. Thread trimming mechanism; 901. Vertical frame; 902. Horizontal plate; 903. Screw; 904. Horizontal bevel gear; 905. Vertical bevel gear; 906. Rotating shaft; 907. Frame; 908. Cutter; 909. Telescopic gas rod. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Reference Figure 1 、 Figure 2 and Figure 3 , the utility model provides an embodiment: an automatic thread-trimming double-needle machine, comprising a machine head 1 and two thread-trimming mechanisms 9, with limit rods 2 fixedly arranged on both sides of the machine head 1 in an axisymmetric manner, a position driving device 4 slidingly arranged in the middle of the lower end of the machine head 1, an electric cylinder 5 fixedly arranged at the center of the lower end of the position driving device 4, a pressing plate 6 fixedly arranged at the lower end of the electric cylinder 5, a pressing gas rod 8 fixedly arranged at the middle position at the rear end of the upper end of the pressing plate 6, the pressing gas rod 8 respectively penetrates the interior of the pressing plate 6 and is fixedly connected to two air pipes at the rear end, the two air pipes respectively penetrate and are fixedly connected to the lower middle position of the rear ends of the two thread-trimming mechanisms 9, the lower end of the machine head 1 is axially symmetrically fixed with the position driving device 4 as the axis, and a lifting motor 3 is fixedly arranged at the middle position at the rear end of the position driving device 4;

[0024] Specifically, the machine head 1 provides a good installation position for the two limit rods 2 and the position drive device 4. The centers of the two limit rods 2 are well fixed with limit rings. The structure and working principle of the two limit rods 2, the two limit rings and the position drive device 4 in the utility model have been disclosed in the automatic thread trimming double-needle machine disclosed in Chinese Patent Publication No. CN213571036U. Its working principle is that when sewing, the driving motor in the sliding plate is used to drive the sliding block to slide on the sliding plate and slide to the set position; the two limit rings are in the shape of a circular ring, which guides the sewing thread to prevent the sewing threads from being entangled, resulting in problems such as thread breakage when the device is working, and ensures the safety of the sewing thread;

[0025] When sliding to the set position, the electric cylinder 5 is used to control the height of the pressing plate 6 fixed at the lower end through the telescopic rod, so that the pressing plate 6 is pressed on the cloth to be sewn, and sewing is performed through the two needle devices 7.

[0026] Reference Figure 1 、 Figure 2 、 Figure 3 and Figure 4 : The two thread trimming mechanisms 9 each include a vertical frame 901, the upper ends of the two vertical frames 901 are axially symmetrically fixed to the lower end of the position driving device 4 near the four corners, and the lower positions of the two vertical frames 901 are rotatably provided with a rotating shaft 906, and the rear positions of the two rotating shafts 906 are respectively connected to the output end of the lifting motor 3 through a synchronous wheel and a synchronous belt;

[0027] The two rotating shafts 906 are axially symmetrical near both ends and are fixedly provided with vertical bevel gears 905. The lower ends of the two vertical frames 901 are both axially symmetrical and are respectively provided with two screw rods 903. The center positions of the upper ends of the four screw rods 903 are fixedly provided with horizontal bevel gears 904. The four vertical bevel gears 905 are respectively engaged with the four horizontal bevel gears 904.

[0028] Four screw rods 903 are grouped in two, with horizontal plates 902 threadedly connected in the middle and lower positions of the rods. The lower ends of the two horizontal plates 902 are fixedly connected to the square frames 907 through connecting rods. The boxes 907 are hollow in design, and two cutters 908 are respectively provided near the middle of the inner side of the two boxes 907 through the rotating shaft.

[0029] The back middle position of the blades of the four cutters 908 are all provided with a telescopic gas rod 909 in a ball hinge. The other ends of the four telescopic gas rods 909 are respectively fixed to the front and rear middle positions inside the two boxes 907. The four cutters 908 in the two boxes 907 are grouped in two in a scissor-like structure and are rotatably connected by a rotating shaft.

[0030] Specifically, the two vertical frames 901 are fixedly connected to the lower end of the position driving device 4, driving the two thread trimming mechanisms 9 to slide well with the electric cylinder 5 and the pressure plate 6 under the action of the position driving device 4. When in use, when adjusting the length of the thread end after thread trimming according to actual needs, the lifting motor 3 is started to drive the two rotating shafts 906 to drive the four vertical bevel gears 905 to rotate, and the four horizontal bevel gears 904 that are well meshed with the four vertical bevel gears 905 then drive the four screw rods 903 to rotate, and the two horizontal plates 902 threadedly sleeved with the four screw rods 903 are lifted and lowered accordingly, wherein the external threads of the four screw rods 903 and the internal threads at the sleeves of the two horizontal plates 902 are reasonably set to ensure that the two horizontal plates 902 are lifted and lowered smoothly, and the two boxes 907 fixedly connected to the two horizontal plates 902 by connecting rods are lifted and lowered accordingly;

[0031] When the line needs to be trimmed, the user can press the gas rod 8, and the gas enters the two hollow boxes 907 from the two air pipes and then enters the four telescopic gas rods 909 to stretch them. The two cutters 908 in each box 907 then approach each other to cut the line ends well. After the cutting is completed, the user pulls up the pressing gas rod 8, and the four telescopic gas rods 909 connected to it through the two air pipes and the two boxes 907 are shortened, and the four cutters 908 are immediately reset.

[0032] Working principle: When in use, when adjusting the length of the thread end after trimming according to actual needs, start the lifting motor 3 to drive the two rotating shafts 906 to drive the four vertical bevel gears 905 to rotate, and the four horizontal bevel gears 904 that are well meshed with the four vertical bevel gears 905 then drive the four screw rods 903 to rotate, and the two horizontal plates 902 threadedly sleeved with the four screw rods 903 rise and fall accordingly. The external threads of the four screw rods 903 and the internal threads at the sleeves of the two horizontal plates 902 are reasonably set to ensure that the two horizontal plates 902 rise and fall smoothly, and the two boxes 907 fixedly connected to the two horizontal plates 902 by connecting rods rise and fall accordingly;

[0033] Secondly, when the line needs to be trimmed, the user can press the air rod 8, and the gas enters the two hollow boxes 907 from the two air pipes and then enters the four telescopic air rods 909 to stretch them. The two cutters 908 in each box 907 then approach each other to cut the line ends well. After the cutting is completed, the air rod 8 is pulled up and pressed, and the four telescopic air rods 909 connected to it through the two air pipes and the two boxes 907 are shortened, and the four cutters 908 are immediately reset.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A double-needle machine with automatic thread trimming, comprising a machine head (1) and two thread trimming mechanisms (9), characterized in that: Limit rods (2) are fixedly provided on both sides of the machine head (1) in an axisymmetric manner. A position driving device (4) is slidably provided in the middle of the lower end of the machine head (1). An electric cylinder (5) is fixedly provided at the center of the lower end of the position driving device (4). A pressure plate (6) is fixedly provided at the lower end of the electric cylinder (5). A pressing gas rod (8) is fixedly provided at the middle position at the rear end of the upper end of the pressure plate (6). The pressing gas rod (8) passes through the interior of the pressure plate (6) and is fixedly connected to two air pipes at the rear end. The two air pipes pass through and are fixedly connected to the lower middle position of the rear ends of the two thread cutting mechanisms (9). A needle lowering device (7) is fixedly provided at the lower end of the machine head (1) in an axisymmetric manner with the position driving device (4) as an axis. Both of the thread cutting mechanisms (9) include a vertical frame (901).

2. The double-needle machine with automatic thread trimming according to claim 1, characterized in that: The upper ends of the two vertical frames (901) are fixedly arranged in an axisymmetric manner to the lower end of the position driving device (4) near the four corners, and a lifting motor (3) is fixedly arranged at the rear middle position of the lower end of the position driving device (4).

3. The double-needle machine with automatic thread trimming according to claim 2, characterized in that: A rotating shaft (906) is rotatably provided at the lower position inside the two vertical frames (901), and vertical bevel gears (905) are fixedly provided through the shaft bodies of the two rotating shafts (906) at the two ends in an axially symmetrical manner. The rear positions of the shaft bodies of the two rotating shafts (906) are respectively connected to the output end of the lifting motor (3) through a synchronous wheel and a synchronous belt.

4. The double-needle machine with automatic thread trimming according to claim 3, characterized in that: Two screw rods (903) are axially symmetrically provided inside the lower ends of the two vertical frames (901) and are rotatably provided therethrough. Horizontal bevel gears (904) are fixedly provided at the center positions of the upper ends of the four screw rods (903). The four vertical bevel gears (905) are respectively engaged with the four horizontal bevel gears (904).

5. The double-needle machine with automatic thread trimming according to claim 4, characterized in that: The middle and lower positions of the rods of two groups of four screw rods (903) are threadedly sleeved with a horizontal plate (902), and the lower ends of the two horizontal plates (902) are fixedly connected to a square frame (907) through a connecting rod. The square frame (907) is hollow in design.

6. The double-needle machine with automatic thread trimming according to claim 5, characterized in that: Two cutters (908) are respectively provided near the middle of the inner side of the two square frames (907) through a rotating shaft, and telescopic gas rods (909) are respectively provided at the middle position of the back side of the blades of the four cutters (908) through a ball hinge, and the other ends of the four telescopic gas rods (909) are respectively passed through and fixed to the middle position of the front and rear of the two square frames (907).

7. The double-needle machine with automatic thread trimming according to claim 6, characterized in that: The four cutters (908) in the two boxes (907) are arranged in groups of two in a scissor-like structure and are rotatably connected via rotating shafts.

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