Novel thread trimming device

Abstract

The utility model discloses a novel thread trimming device which comprises a motor, the motor is connected with a flat seaming machine body, the output end of the motor is connected with a cam, the thread trimming device further comprises an installation plate, a guide shaft is installed on the installation plate in a sliding mode, a spring is arranged on the guide shaft in a sleeved mode, one end of the spring is connected with the guide shaft, and the other end of the spring is connected with the cam. The other end of the spring is connected with the mounting plate, a limiting part is arranged on the guide shaft, the end, away from the cam, of the guide shaft is connected with a first transmission arm through a connecting plate, and the end, away from the connecting plate, of the first transmission arm is rotationally connected with a second transmission arm; the end, away from the first transmission arm, of the second transmission arm is rotationally connected with a thread trimmer. According to the novel thread trimming device, the design that the motor and the cam are combined is adopted, so that thread trimming operation is more accurate and efficient. The problem that an upper thread or a bottom thread cannot be completely cut off due to insufficient stroke stability of a traditional thread cutting device is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of interlock sewing machines, in particular to a novel thread trimming device. Background Art

[0002] A flat sewing machine is a machine that uses one or more sewing threads to form one or more stitches on a sewing material. It can interweave or sew one or more layers of sewing material. This machine is suitable for a variety of materials, including cotton, linen, silk, wool, synthetic fibers, leather, plastics and paper. Existing flat sewing machines are favored for their neat, beautiful, flat and firm sewing stitches. At the same time, these machines have the advantages of fast sewing speed and easy operation.

[0003] However, despite the advantages of existing interlock sewing machines, their thread cutting mechanisms have certain limitations. Currently, the thread cutting mechanisms of interlock sewing machines mainly rely on electromagnets or cylinders to drive the scissors to cut the thread ends. Although these mechanisms are simple, they often fail to completely cut the upper or lower thread due to insufficient travel stability, thus affecting operating efficiency and product quality. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a novel thread trimming device, aiming to solve the problems raised by the above background technology.

[0005] To achieve the above objectives, the utility model is implemented through the following technical solutions: a new type of thread trimming device, including a motor, which is connected to a body of a stretch sewing machine, and a cam is connected to the output end of the motor. The thread trimming device also includes a mounting plate, on which a guide shaft is slidably mounted, and a spring is sleeved on the guide shaft, one end of the spring is connected to the guide shaft, and the other end of the spring is connected to the mounting plate, and the spring provides an elastic force for the guide shaft to approach the cam, and a limiting portion is provided on the guide shaft. When the spring is in an extended state, the limiting portion contacts the mounting plate, and the end of the guide shaft away from the cam is connected to a first transmission arm through a connecting plate, and the end of the first transmission arm away from the connecting plate is rotatably connected to a second transmission arm, and the second transmission arm is L-shaped, and the end of the second transmission arm away from the first transmission arm is rotatably connected to a thread trimmer, and the thread trimmer is rotatably connected to the body of the stretch sewing machine.

[0006] Preferably, the motor is connected to the interlock sewing machine body via a first connecting member and a second connecting member.

[0007] Preferably, the output end of the motor is connected to a first swing arm, the first swing arm is movably connected to a second swing arm, a first transmission groove is provided on the second swing arm, the first swing arm is movably connected to the first transmission groove on the second swing arm through a screw, the second swing arm is rotatably connected to a third swing arm, and the third swing arm is rotatably connected to the mounting plate.

[0008] Preferably, a fourth swing arm is rotatably connected to the mounting plate, and a second transmission groove is provided on the fourth swing arm. The second transmission groove and one end of the guide shaft close to the second transmission groove are movably connected to the second transmission groove through a screw.

[0009] Preferably, one end of the guide shaft close to the cam is rotatably connected to a rotating wheel, and the rotating wheel is in contact with the cam.

[0010] Beneficial Effects

[0011] The utility model provides a novel thread trimming device. The novel thread trimming device provided by the utility model adopts a combination design of a motor and a cam, so that the thread trimming operation is more accurate and efficient. When the motor is started, the output end thereof drives the cam to rotate, and the contact between the protruding part of the cam and the guide shaft realizes the precise movement of the guide shaft. The guide shaft drives the connecting plate to move, the connecting plate drives the first transmission arm to move, the first transmission arm drives the second transmission arm to rotate relative to the body of the interlock sewing machine, the second transmission arm drives the thread trimmer to swing, and the thread trimmer performs the thread trimming operation. The problem that the traditional thread trimming device cannot completely cut the upper thread or the lower thread due to insufficient stroke stability is solved. In addition, the spring on the guide shaft in the device provides the guide shaft with elastic force to approach the cam, thereby enhancing the recovery speed and stability of the thread trimming device. The limiting part contacts the mounting plate in the state where the spring is extended, effectively limiting the excessive movement of the guide shaft, thereby avoiding mechanical failure and ensuring the long-term reliability of the equipment. Through the motion chain of the first transmission arm and the second transmission arm, the thread trimmer can effectively swing to achieve rapid and uniform thread trimming. The L-shaped design of the second transmission arm not only simplifies the transmission mechanism, but also optimizes the shearing force by changing the lever length and angle, making the thread cutting process smoother. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional structural schematic diagram of a novel thread trimming device described in the utility model.

[0013] Figure 2 This is a schematic diagram of the three-dimensional structure from a first viewing angle of a novel thread trimming device of the present invention that does not include the first connecting member and the second connecting member.

[0014] Figure 3 This is a schematic diagram of the stereoscopic structure from a second viewing angle of a novel thread trimming device of the present invention, excluding the first connecting member and the second connecting member.

[0015] Figure 4 The utility model is a schematic diagram of the connection structure of a motor, a cam and a guide shaft of a novel thread trimming device.

[0016] Figure 5 The utility model is a structural schematic diagram of a novel thread trimming device connected to a flat sewing machine body. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] See also Figure 1-5 The utility model provides a novel thread trimming device, comprising a motor 1, wherein the motor 1 is connected to a stretch sewing machine body 2, and a cam 3 is connected to the output end of the motor 1. The thread trimming device also comprises a mounting plate 4, wherein the mounting plate 4 is connected to the stretch sewing machine body 2, and a guide shaft 5 is slidably mounted on the mounting plate 4, wherein a spring 6 is sleeved on the guide shaft 5, wherein one end of the spring 6 is connected to the guide shaft 5, and the other end of the spring 6 is connected to the mounting plate 4, wherein the spring 6 provides an elastic force for the guide shaft 5 to approach the cam 3, and a limiting portion 501 is arranged on the guide shaft 5, wherein when the spring 6 is extended, the limiting portion 501 contacts the mounting plate 4, and an end of the guide shaft 5 away from the cam 3 is connected to a first transmission arm 8 through a connecting plate 7, and an end of the first transmission arm 8 away from the connecting plate 7 is rotatably connected to a second transmission arm 9, wherein the second transmission arm 9 is L-shaped, and a bending part of the L-shape of the second transmission arm 9 is rotatably connected to the stretch sewing machine body 2. The end of the second transmission arm 9 away from the first transmission arm 8 is rotatably connected to a thread cutter 10, and the thread cutter 10 is rotatably connected to the interlock sewing machine body 2. The motor 1 is a stepper motor, and the rated speed of the stepper motor is 1500 steps per minute.

[0019] When in use, start the motor 1, the output end of the motor 1 drives the cam 3 to rotate, the protruding part of the cam 3 contacts the guide shaft 5 and drives the guide shaft 5 to move, the guide shaft 5 drives the connecting plate 7 to move, the connecting plate 7 drives the first transmission arm 8 to move, the first transmission arm 8 drives the second transmission arm 9 to rotate relative to the interlock sewing machine body 2, the second transmission arm 9 drives the thread trimmer 10 to swing, and the thread trimmer 10 performs the thread trimming operation.

[0020] The new thread trimming device provided by the utility model adopts a combination design of a motor 1 and a cam 3, so that the thread trimming operation is more accurate and efficient. When the motor 1 is started, its output end drives the cam 3 to rotate, and the contact between the protrusion of the cam 3 and the guide shaft 5 realizes the precise movement of the guide shaft 5. The guide shaft 5 drives the connecting plate 7 to move, the connecting plate 7 drives the first transmission arm 8 to move, the first transmission arm 8 drives the second transmission arm 9 to rotate relative to the interlock sewing machine body 2, the second transmission arm 9 drives the thread trimmer 10 to swing, and the thread trimmer 10 performs the thread trimming operation. The problem that the traditional thread trimming device cannot completely cut the upper thread or the lower thread due to insufficient stroke stability is solved. In addition, the spring 6 on the guide shaft 5 in the device provides the guide shaft with an elastic force to approach the cam 3, thereby enhancing the recovery speed and stability of the thread trimming device. The limiter 501 contacts the mounting plate 4 when the spring 6 is extended, effectively limiting the excessive movement of the guide shaft 5, thereby avoiding mechanical failure and ensuring the long-term reliability of the equipment. The thread cutter 10 can swing effectively through the kinematic chain of the first transmission arm 8 and the second transmission arm 9 to achieve rapid and uniform thread cutting. The L-shaped design of the second transmission arm 9 not only simplifies the transmission mechanism, but also optimizes the shearing force by changing the lever length and angle, making the thread cutting process smoother.

[0021] Specifically, the motor 1 is connected to the interlock sewing machine body 2 via a first connecting member 101 and a second connecting member 102 .

[0022] Specifically, the output end of the motor 1 is connected to a first swing arm 11, the first swing arm 11 is movably connected to a second swing arm 12, a first transmission slot 1201 is provided on the second swing arm 12, the first swing arm 11 is movably connected to the first transmission slot 1201 on the second swing arm 12 by a screw, the second swing arm 12 is rotatably connected to a third swing arm 13, and the third swing arm 13 is rotatably connected to the mounting plate 4. When the output end of the motor 1 rotates, the first swing arm 11 is driven to swing, the first swing arm 11 drives the second swing arm 12 to move, and the second swing arm 12 drives the third swing arm 13 to move. This structure makes the rotation of the output end of the motor 1 more stable.

[0023] Specifically, the mounting plate 4 is rotatably connected with a fourth swing arm 14, and the fourth swing arm 14 is provided with a second transmission slot 1401. The second transmission slot 1401 and one end of the guide shaft 5 close to the second transmission slot 1401 are movably connected to the second transmission slot 1401 through a screw. When the guide shaft 5 moves, the guide shaft 5 drives the fourth swing arm 14 to move through the second transmission slot 1401. The setting of the fourth swing arm 14 makes the movement of the guide shaft 5 more stable.

[0024] Specifically, one end of the guide shaft 5 close to the cam 3 is rotatably connected to a rotating wheel 15, and the rotating wheel 15 contacts the cam 3. When the cam 3 rotates, the cam 3 drives the guide shaft 5 to move through the rotating wheel 15, and the rotating wheel 15 rotates. The setting of the rotating wheel 15 can reduce the wear of the cam 3 on the guide shaft 5.

[0025] It should be noted that, in this document, relational terms such as first and second, etc. are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

Claims

1. A new type of thread trimming device, characterized in that: The invention comprises a motor (1), wherein the motor (1) is connected to a body (2) of a flat sewing machine, and the output end of the motor (1) is connected to a cam (3). The thread trimming device also comprises a mounting plate (4), wherein a guide shaft (5) is slidably mounted on the mounting plate (4), and a spring (6) is sleeved on the guide shaft (5), wherein one end of the spring (6) is connected to the guide shaft (5), and the other end of the spring (6) is connected to the mounting plate (4), and the spring (6) provides an elastic force for the guide shaft (5) to approach the cam (3). A limiting portion (56) is provided on the guide shaft (5). 01), when the spring (6) is in the extended state, the limiting portion (501) contacts the mounting plate (4), and the end of the guide shaft (5) away from the cam (3) is connected to the first transmission arm (8) through the connecting plate (7), and the end of the first transmission arm (8) away from the connecting plate (7) is rotatably connected to the second transmission arm (9), and the second transmission arm (9) is L-shaped, and the end of the second transmission arm (9) away from the first transmission arm (8) is rotatably connected to the thread cutter (10), and the thread cutter (10) is rotatably connected to the interlock sewing machine body (2).

2. A novel thread trimming device according to claim 1, characterized in that: The motor (1) is connected to the interlock sewing machine body (2) via a first connecting member (101) and a second connecting member (102).

3. A novel thread trimming device according to claim 1, characterized in that: The output end of the motor (1) is connected to a first swing arm (11), the first swing arm (11) is movably connected to a second swing arm (12), a first transmission groove (1201) is provided on the second swing arm (12), the first swing arm (11) is movably connected to the first transmission groove (1201) on the second swing arm (12) via a screw, the second swing arm (12) is rotatably connected to a third swing arm (13), and the third swing arm (13) is rotatably connected to the mounting plate (4).

4. A novel thread trimming device according to claim 3, characterized in that: A fourth swing arm (14) is rotatably connected to the mounting plate (4), and a second transmission groove (1401) is provided on the fourth swing arm (14). The second transmission groove (1401) and one end of the guide shaft (5) close to the second transmission groove (1401) are movably connected to the second transmission groove (1401) via a screw.

5. A novel thread trimming device according to claim 1, characterized in that: One end of the guide shaft (5) close to the cam (3) is rotatably connected to a rotating wheel (15), and the rotating wheel (15) is in contact with the cam (3).

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