A bird nest preventing device for suction and sewing machine using the same

Abstract

The utility model discloses a kind of air suction bird nest prevention devices, including cylinder, support, line pressing plate, air suction connector, opening and closing mechanism, air suction connector is installed on support, and is connected with external air suction equipment, air suction passage is provided in air suction connector, and air suction port is formed on its surface, one end of line pressing plate is fixedly connected with support, the other end is sealed with air suction port, opening and closing mechanism is installed on support, and can be positioned sliding relative to support, cylinder drives opening and closing mechanism, opening and closing mechanism makes line pressing plate end open, and line pressing plate and air suction port form line clamping gap between each other.The utility model also discloses a sewing machine using the device.The air suction bird nest prevention device of the utility model can cooperate with the sewing work of sewing machine, when cutting surface thread end when starting sewing and cutting bottom thread when sewing is finished, can well cooperate and carry out line clamping work, complete guarantee surface thread end, bottom thread cutting work, effectively prevent bird nest formation, simple structure, make sewing quality more optimal.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, specifically to a suction-type bird nest prevention device and a sewing machine using the device. Background Technology

[0002] When a sewing machine begins sewing, a certain length of thread remains at the eye of the needle. This thread, initially carried to the back of the fabric, creates a clump of thread resembling a "bird's nest." This initial "bird's nest" is unsightly and unacceptable, especially for garments requiring high-quality sewing. Several methods exist for removing this "bird's nest," such as thread pullers and electronic thread clamps. While simple in structure, these methods are not ideal for eliminating the "bird's nest." Therefore, it is essential to address the shortcomings of existing technologies. Summary of the Invention

[0003] The purpose of this invention is to solve the problems mentioned in the background art and to provide a suction-type bird nest prevention device and a sewing machine using the device.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: a suction-type bird nest prevention device, including a cylinder, a bracket, a pressure plate, a suction connector, and an opening and closing mechanism. The bracket is installed and connected to the cylinder. The suction connector is installed on the bracket and connected to an external suction device. The suction connector has a suction channel and a suction port is formed on its surface. One end of the pressure plate is fixedly connected to the bracket, and the other end is correspondingly sealed to the suction port. The opening and closing mechanism is installed on the bracket and can be positioned and slid relative to the bracket. The cylinder drives the opening and closing mechanism, which causes the end of the pressure plate to open, forming a wire clamping gap between the pressure plate and the suction port.

[0005] In the above-mentioned suction-type bird nest prevention device, the opening and closing mechanism includes a push plate and a positioning head. One end of the push plate is fixedly connected to the positioning head, and the other end passes through the space between the suction connector and the bracket. The positioning head is fixedly connected to the lever of the cylinder. The cylinder drives the push plate to move, and the end of the push plate presses against the space between the pressure plate and the suction connector, thereby forming a wire clamping gap.

[0006] In the above-mentioned suction-type bird nest prevention device, the bracket is provided with a sliding groove for accommodating the push plate, and the push plate is positioned and slid in the sliding groove.

[0007] In the aforementioned air-suction bird nest prevention device, the bracket is also provided with a positioning groove, and the positioning head slides in the positioning groove.

[0008] In the aforementioned air-suction bird nest prevention device, the air intake is set in a rectangular groove, and the end of the pressure plate is also designed in a corresponding shape.

[0009] In the above-mentioned suction-type bird nest prevention device, the suction connector is provided with a corresponding connecting pipe that communicates with the suction channel.

[0010] This utility model also provides a sewing machine, including a base plate, a rotary hook, a first thread cutter, a second thread cutter, and a needle; the base plate is provided with an mounting plate, and the above-mentioned suction anti-bird nest device is installed and connected on the mounting plate. The suction anti-bird nest device is installed at the lower side of the rotary hook. The suction anti-bird nest device is opened or closed by the sewing machine control system. The suction anti-bird nest device works in conjunction with the thread cutting of the rotary hook, the first thread cutter, and the second thread cutter.

[0011] In the aforementioned sewing machine, the suction anti-bird nest device is installed on the lower left side of the rotary hook, and the suction port of the suction anti-bird nest device is located at the tail of the thread cutter. The inclined position of the suction anti-bird nest device forms an angle α with the horizontal axis of the rotary hook, and the angle α is in the range of 30° to 60°.

[0012] In the aforementioned sewing machine, the first thread cutter is rotatably mounted on the outer periphery of the rotary hook; the second thread cutter is rotatably mounted on the outer periphery of the first thread cutter, or it can be fixedly mounted on the base plate.

[0013] This utility model has the following beneficial effects: This utility model's suction-type bird nest prevention device can work in conjunction with a sewing machine. When cutting the top thread at the start of a sewing process and when cutting the bottom thread at the end of a sewing process, it can effectively perform thread clamping work, ensuring the proper cutting of the top and bottom threads, thus preventing bird nest formation. The structure is simple and improves sewing quality. Attached Figure Description

[0014] Figure 1 , Figure 2 This is a three-dimensional structural diagram of the air-suction bird nest prevention device of this utility model from two different directions; Figure 3 , Figure 4 These are exploded structural diagrams of the air-suction bird nest prevention device of this utility model from two different directions; Figure 5 This is a structural schematic diagram of the sewing machine of this utility model; Figures 6 to 8 This is a schematic diagram showing the position of the blade in different sewing processes of the sewing machine of this utility model. Detailed Implementation

[0015] The present invention will be further described in conjunction with the accompanying drawings.

[0016] Please see Figures 5 to 8This utility model provides a sewing machine, including a base plate 13, a rotary hook 14, a first thread cutter 15, a second thread cutter 16, and a needle 17; the base plate 13 is provided with an mounting plate 18, and a suction anti-bird nest device 20 is installed and connected on the mounting plate 18. The suction anti-bird nest device 20 is installed on the lower side of the rotary hook 14. The suction anti-bird nest device 20 is opened or closed by the sewing machine control system. The suction anti-bird nest device 20 works in conjunction with the thread cutting of the rotary hook 14, the first thread cutter 15, and the second thread cutter 16.

[0017] Furthermore, the suction-air bird nest prevention device 20 is installed on the lower left of the rotary hook 14, and the suction port 7 in the suction-air bird nest prevention device 20 is located at the tail of the wire cutter 15. The suction-air bird nest prevention device 20 is installed at an angle α with the horizontal axis of the rotary hook 14, and the angle α is in the range of 30° to 60°.

[0018] Furthermore, the first wire cutter 15 is rotatably disposed on the outer periphery of the rotary hook 14; the second wire cutter 16 is rotatably disposed on the outer periphery of the first wire cutter 15, or it can be fixedly disposed on the base plate 13.

[0019] Please see Figures 1 to 4 A suction-type bird nest prevention device includes a cylinder 1, a bracket 2, a pressure plate 3, a suction connector 4, and an opening and closing mechanism 5. The bracket 2 is installed and connected to the cylinder 1. The suction connector 4 is installed on the bracket 2 and connected to an external suction device. The suction connector 4 has a suction channel 6 and a suction port 7 on its surface. The suction connector 4 has a connecting pipe 12 corresponding to the suction channel 6. One end of the pressure plate 3 is fixedly connected to the bracket 2, and the other end is correspondingly sealed to the suction port 7. The opening and closing mechanism 5 is installed on the bracket 2 and can be positioned and slid relative to the bracket 2. The cylinder 1 drives the opening and closing mechanism 5, which causes the end of the pressure plate 3 to open, forming a wire clamping gap between the pressure plate 3 and the suction port 7.

[0020] Furthermore, the opening and closing mechanism 5 includes a push plate 8 and a positioning head 9. One end of the push plate 8 is fixedly connected to the positioning head 9, and the other end passes through the space between the suction connector 4 and the bracket 2. The positioning head 9 is fixedly connected to the lever 1-1 of the cylinder 1. The cylinder 1 drives the push plate 8 to move, and the end of the push plate 8 presses against the space between the pressure plate 3 and the suction connector 4, thereby forming a wire clamping gap.

[0021] Furthermore, the bracket 2 is provided with a sliding groove 10 for accommodating the push plate 8, in which the push plate 8 is positioned and slids; the bracket 2 is also provided with a positioning groove 11, in which the positioning head 9 slides. This better ensures the movement and positioning of the push plate 8.

[0022] Preferably, the air intake 7 is a rectangular groove, and the end of the pressure plate 3 is also designed in a corresponding shape.

[0023] During installation, the first wire cutter 15 and the second wire cutter 16 are respectively located on the left and right sides of the needle 17. The mounting plate 18 is installed on the base plate 13 with screws and can be rotated 60°. The suction anti-bird nest device 20 is fixed on the bracket mounting plate 18 with screws and can be moved left and right with a stroke of 25mm and rotated 30° on the mounting plate 18. The cylinder 1 in the suction anti-bird nest device 20 and the connecting pipe 1 on the suction channel 6 are provided on the suction connector 4 and connected to the external air source equipment through the suction pipe.

[0024] When the bird nest prevention function is not activated, the wire cutter 15 is located in... Figure 6 The location shown; when the anti-bird nest function is turned on, such as Figure 7 As shown, the thread cutter 15 moves, with the cutting groove 15-1 on the thread cutter 15 located directly below the needle 17. When the needle 17 begins to descend, the suction connector 4 in the suction anti-bird's nest device 20 draws air, and the needle and the thread on it pass through the cutting groove 15-1 of the thread cutter 15. During the upward movement of the needle from the bottom dead center, under the action of the rotary hook 14, the thread end at the needle 17 is brought to the underside of the blade of the thread cutter 15, and the air in the suction anti-bird's nest device 20... Cylinder 1 begins to operate, driving push plate 8 forward to insert between pressure plate 3 and suction connector 4, causing the front end of pressure plate 3 to open upward and separate from suction connector 4. At this time, suction port 7 of suction connector 4 opens, and a wire-clamping gap is formed between suction port 7 and pressure plate 3. After suction port 7 sucks in the wire end, push plate 8 moves backward, and pressure plate 3 returns to its original position, pressing the wire end in place. During the process of the take-up lever moving to the top dead center, wire cutter 15 and wire cutter 26 begin to operate, such as... Figure 8 As shown, when the thread take-up lever moves to the top dead center, thread cutter 15 and thread cutter 26 engage, cutting off the thread end located in the blade groove 15-1 on thread cutter 15. Then, the suction anti-bird nest device 20 stops working, and the cut thread end is clamped between the front end of the pressure plate 3 and the suction connector 4; thread cutter 15 and thread cutter 26 return to their original positions. Figure 1 Afterwards, the sewing machine resumes normal sewing operations. Once the prescribed number of stitches has been completed, the sewing machine stops, and the suction anti-bird's nest device 20 activates. Cylinder 1 repeats the aforementioned forward movement. At this time, the thread end clamped between the front end of the pressure plate 3 and the suction connector 4 is sucked away, simultaneously holding the bottom thread after sewing. The foot pedal is pressed to cut the thread, and thread cutters 15 and 16 cut the bottom thread. After thread cutter 15 returns to its original position... Figure 7 The suction and anti-bird nest device 20 repeats the above-mentioned work of clamping and cutting the thread. The operation of the rotary hook 14, thread cutter 15, thread cutter 2 16, and needle 17 is the existing technology of sewing machines. The suction and anti-bird nest device 20, which is designed in conjunction with the machine, can better complete the thread cutting during the sewing process.

[0025] The above provides a detailed description of a suction-type bird nest prevention device and a sewing machine using the device provided in the embodiments of this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solution disclosed in this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A suction-type bird nest prevention device, characterized in that: The device includes a cylinder (1), a bracket (2), a wire pressing plate (3), a suction connector (4), and an opening and closing mechanism (5). The bracket (2) is installed and connected to the cylinder (1). The suction connector (4) is installed on the bracket (2) and connected to an external suction device. The suction connector (4) has a suction channel (6) and a suction port (7) is formed on its surface. One end of the wire pressing plate (3) is fixedly connected to the bracket (2), and the other end is correspondingly blocked to the suction port (7). The opening and closing mechanism (5) is installed on the bracket (2) and can be positioned and slid relative to the bracket (2). The cylinder (1) drives the opening and closing mechanism. The opening and closing mechanism (5) causes the end of the wire pressing plate (3) to open, and a wire clamping gap is formed between the wire pressing plate (3) and the suction port (7).

2. The air-suction bird nest prevention device according to claim 1, characterized in that: The opening and closing mechanism (5) includes a push plate (8) and a positioning head (9). One end of the push plate (8) is fixedly connected to the positioning head (9), and the other end passes through the suction connector (4) and the bracket (2). The positioning head (9) is fixedly connected to the lever (1-1) of the cylinder (1). The cylinder (1) drives the push plate (8) to move. The end of the push plate (8) is pressed between the pressure plate (3) and the suction connector (4), thereby forming a wire clamping gap.

3. The air-suction bird nest prevention device according to claim 2, characterized in that: The bracket (2) is provided with a groove (10) for accommodating the push plate (8), and the push plate (8) is positioned and slid in the groove (10).

4. The air-suction bird nest prevention device according to claim 2, characterized in that: The bracket (2) is also provided with a positioning groove (11), and the positioning head (9) slides in the positioning groove (11).

5. The air-suction bird nest prevention device according to claim 1, characterized in that: The air intake (7) is set in a rectangular groove, and the end of the pressure plate (3) is also designed in a corresponding shape.

6. The air-suction bird nest prevention device according to claim 1, characterized in that: The suction connector (4) is provided with a corresponding connecting pipe (12) for the suction channel (6).

7. A sewing machine, comprising a base plate (13), a rotary hook (14), a first thread cutter (15), a second thread cutter (16), and a needle (17); characterized in that: The base plate (13) is provided with an installation plate (18), and the installation plate (18) is connected to the suction anti-bird nest device (20) according to any one of claims 1 to 6. The suction anti-bird nest device (20) is installed on the lower side of the rotary hook (14). The suction anti-bird nest device (20) is opened or closed by the sewing machine control system. The suction anti-bird nest device (20) works in conjunction with the rotary hook (14), the first thread cutter (15), and the second thread cutter (16) to cut the thread.

8. A sewing machine according to claim 7, characterized in that: The suction-proof bird nest device (20) is installed on the lower left of the rotary hook (14). The suction port (7) in the suction-proof bird nest device (20) is located at the tail of the wire cutter (15). The suction-proof bird nest device (20) is installed at an angle α between the tilt position and the horizontal axis of the rotary hook (14). The angle α is in the range of 30° to 60°.

9. A sewing machine according to claim 7, characterized in that: The first wire cutter (15) is rotatably mounted on the outer periphery of the rotary hook (14); the second wire cutter (16) is rotatably mounted on the outer periphery of the first wire cutter (15), or it can be fixedly mounted on the base plate (13).

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