Double-blade thread trimming device of computer sewing machine

Abstract

The utility model discloses a double-cutter thread trimming device of a computer sewing machine. The double-cutter thread trimming device comprises a motor, a first swing assembly, a transmission shaft set, a second swing assembly, a first cutter set and a second cutter set. The motor comprises a rotating shaft and a motor shifting piece; the first swing assembly is in transmission connection with the transmission shaft set and the motor shifting piece. The second swing assembly comprises a connecting rod rotationally connected with the first cutter set and a swing rod set rotationally connected with the second cutter set. The connecting rod and the swing rod group are respectively in transmission connection with the transmission shaft; the connecting rod and the swing rod set drive the first cutter set and the second cutter set to rotate in the opposite directions at the same time under coaxial rotation of the transmission shaft, meshing and separation are achieved, the thread trimming position is close, the thread end is short, and the thread trimming efficiency is improved. In addition, rotation displacement of the motor is amplified through cooperation of the first swing assembly, the transmission shaft set and the second swing assembly, the first cutter set and the second cutter set can obtain large rotation amplitude, and the requirement for driving force is reduced.

Description

Technical Field

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

[0002] The automatic thread trimming device is one of the important parts of the automatic sewing machine at this stage. It realizes automatic thread trimming through multiple parts, reduces manual operation and improves production efficiency. The Chinese utility model patent (publication number CN217127728U) discloses an automatic thread trimming device for a computer sewing machine, including a moving knife and a fixed knife. When trimming the thread, under the drive of the driving member, the thread trimming driving mechanism axially squeezes the reset spring along the thread trimming driving shaft, the roller approaches the thread trimming cam, and the shuttle bed transmission shaft drives the cam assembly to rotate synchronously, so that the roller contacts the thread trimming contact part of the thread trimming cam, and drives the thread trimming driving mechanism and the connecting rod transmission mechanism to swing, thereby driving the thread trimming transmission shaft and the moving knife to rotate, and the moving knife and the fixed knife bite to cut the thread; the cam assembly continues to rotate with the shuttle bed transmission shaft, so that the roller contacts the reset contact part of the thread trimming cam, and resets the thread trimming driving mechanism, the connecting rod transmission mechanism, the thread trimming transmission shaft and the moving knife under the action of the reset spring. At this time, the moving knife is separated from the fixed knife, and a complete automatic thread trimming cycle is completed.

[0003] However, this method of thread cutting has longer thread ends due to the far cutting position, which requires manual trimming later. Summary of the invention

[0004] The utility model aims to provide a double-knife thread trimming device, which solves the problem of a long distance of thread trimming position through the synchronous rotation of two cutting knives.

[0005] In order to achieve the above object, the utility model provides

[0006] A double-knife thread trimming device for a computer sewing machine comprises a motor, a first swing assembly, a transmission shaft assembly, a second swing assembly, a first knife assembly and a second knife assembly;

[0007] Motor: including a rotating shaft and a motor paddle connected to the rotating shaft;

[0008] The first swing assembly is connected to the motor paddle, and changes the reciprocating rotation of the rotating shaft into swinging;

[0009] The transmission shaft assembly includes a fixed transmission sleeve and a transmission shaft rotating in the transmission sleeve; one end of the transmission shaft is provided with a swing input end; the first swing component is transmission-connected with the input end and converts the swing of the first swing component into the rotation of the transmission shaft;

[0010] The second swing assembly comprises a connecting rod rotatably connected to the first knife group and a swing arm group rotatably connected to the second knife group; the connecting rod and the swing arm group are respectively connected to the transmission shaft in a transmission manner;

[0011] The first cutter group and the second cutter group are respectively rotatably installed on the body of the sewing machine; under the coaxial rotation of the transmission shaft, the connecting rod and the swing rod group drive the first cutter group and the second cutter group to rotate in opposite directions.

[0012] Preferably, the first cutter group includes a first moving cutter ring and a first moving cutter; the first moving cutter is installed on the first moving cutter ring; the first moving cutter ring is rotatably installed on the body; the first moving cutter ring is connected to one end of the connecting rod.

[0013] Preferably, the second cutter group includes a second moving cutter ring and a second moving cutter; the second moving cutter is installed on the second moving cutter ring; the second moving cutter ring is rotatably installed on the body; the second moving cutter ring is connected to one end of the swing rod group; the first moving cutter ring and the second moving cutter ring are arranged in the same axial direction.

[0014] Preferably, the motor is a stepping motor.

[0015] Preferably, the first swing assembly includes a swing plate and a push-pull connecting rod; one end of the swing plate is connected to the motor flap; one end of the push-pull connecting rod is connected to the swing plate, and the other end is connected to the input end.

[0016] Preferably, it further includes a connecting piece; a steel sleeve is sleeved on the connecting piece; the motor flap is provided with a waist-shaped groove that slidably cooperates with the steel sleeve, one end of the connecting piece is slidably cooperated with the waist-shaped groove through the steel sleeve, and one end is fixedly connected to the other end of the swing plate.

[0017] Preferably, it further includes a connecting rod swing shaft; the connecting rod swing shaft is installed at the other end of the transmission shaft and is linked with the transmission shaft; one end of the connecting rod is connected to the connecting rod swing shaft, and the other end is connected to the first cutter group.

[0018] Preferably, the swing rod group includes a mounting plate and a rocker; the middle part of the mounting plate is inserted on the transmission shaft, one end is connected to the connecting rod swing shaft, and the other end is connected to one end of the rocker; the other end of the rocker is connected to the second cutter group.

[0019] Preferably, the connecting rod swing shaft is provided with a mounting hole for inserting the transmission shaft, the mounting hole is communicated with an opening, and the opening is adjusted in tightness through an adjustable locking piece.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] The utility model adopts a stepping motor as the driving source. The motor only needs a small angular displacement drive. Combined with the amplification effect of the first swing assembly, the transmission shaft group and the second swing assembly, the first cutter group and the second cutter group can obtain a large rotational displacement. And the rotational displacement of the cutter group is amplified, reducing the demand for driving force and further reducing energy consumption. At the same time, the rotational accuracy of the cutter group can be better controlled. The utility model also drives the first moving cutter and the second moving cutter to rotate in opposite directions by the rotation of the transmission shaft, realizing biting and separation. The biting part is directly below the needle tip or near the direct below of the needle tip. Compared with the prior art, the wire cutting position is closer, the wire head is short, and the wire cutting efficiency is improved. Description of the Drawings

[0022] Figure 1 is the top view of this embodiment;

[0023] Figure 2 is the exploded view of this embodiment;

[0024] Figure 3 is the three-dimensional view of this embodiment (the computerized sewing machine rotary hook is not drawn)

[0025] Figure 4 is the installation schematic diagram of the motor and the first swing assembly of this embodiment;

[0026] Figure 5 is the installation schematic diagram of the first swing assembly and the transmission shaft group of this embodiment;

[0027] Figure 6 is the driving connection structure schematic diagram of the second cutter group of this embodiment;

[0028] Figure 7 is the driving connection structure schematic diagram of the first cutter group of this embodiment;

[0029] Figure 8 is the installation schematic diagram of the connecting rod swing shaft and the second swing assembly of this embodiment;

[0030] Figure 9 is the structure schematic diagram of the connecting rod swing shaft of this embodiment. Detailed Embodiment

[0031] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0032] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0033] like Figures 1-9 As shown, this embodiment discloses a double-knife thread trimming device for a computer sewing machine, comprising a motor 1, a first swing assembly 2, a transmission shaft assembly 3, a second swing assembly 4, a first knife assembly 5 and a second knife assembly 6;

[0034] The motor 1 includes a rotating shaft 10 and a motor paddle 11 connected to the rotating shaft 10 ; the motor paddle 11 has a swing end that is driven by the rotation of the motor rotating shaft 10 to swing left and right.

[0035] The first swing assembly 2 is connected to the swing end of the motor paddle 11, and the reciprocating rotation of the rotating shaft 10 is changed into a reciprocating swing;

[0036] The transmission shaft assembly includes a fixed transmission sleeve 30 and a transmission shaft 31 rotating in the transmission sleeve; the transmission sleeve 30 is fixedly mounted on the body of the computer sewing machine. One end of the transmission shaft 31 is provided with a swing input end 310; the first swing component 2 is in transmission connection with the input end 310, and converts the swing of the first swing component 310 into the rotation of the transmission shaft 31;

[0037] The second swing assembly 4 includes a connecting rod 41 rotatably connected to the first knife group 5 and a swing arm group 42 rotatably connected to the second knife group 6; the connecting rod 41 and the swing arm group 42 are respectively connected to the transmission shaft 31; the transmission shaft 31 drives the connecting rod 41 to move in the same direction; and drives the swing arm group 42 to move in the opposite direction.

[0038] The first knife group 5 and the second knife group 6 are rotatably mounted on the body of the sewing machine respectively; the connecting rod 41 and the rocker arm group 42 drive the first knife group 5 and the second knife group 6 to rotate in opposite directions under the coaxial rotation of the transmission shaft 31 to achieve engagement and separation.

[0039] More specifically, the first cutter group 5 includes a first moving cutter ring 50 and a first moving cutter 51; the first moving cutter 51 is installed on the first moving cutter ring 50; one end of the first moving cutter ring 50 is connected to one end of the connecting rod 41. The second cutter group 6 includes a second moving cutter ring 60 and a second moving cutter 61; the second moving cutter 61 is installed on the second moving cutter ring 60; one end of the second moving cutter ring 60 is connected to one end of the swing rod group 42; the first moving cutter ring 50 and the second moving cutter ring 60 are arranged in the same axial direction.

[0040] As shown in the attached Figures 1-3 description, the first moving cutter ring 50 and the second moving cutter ring 60 are coaxially rotatably installed on the computerized sewing machine rotary hook shaft sleeve 7 and are located behind the computerized sewing machine rotary hook 8. The needle of the sewing machine (not shown in the figure) hangs directly above the computerized sewing machine rotary hook 8, and the first moving cutter 51 and the second moving cutter 61 surround the left and right outer sides of the computerized sewing machine rotary hook 8 and are lower than the needle tip in the reset state.

[0041] As shown in the attached Figures 4-9 description, the motor 1 used in this embodiment is a stepping motor. Through the small angular displacement drive of the stepping motor and the amplification effect of the first swing assembly 2, the transmission shaft group 3 and the second swing assembly 4, the first cutter group 5 and the second cutter group 6 can obtain a larger rotational displacement. The rotational displacement of the cutter group is amplified, reducing the demand for driving force and further reducing energy consumption. At the same time, the rotational accuracy of the cutter group can be better controlled.

[0042] More specifically, the first swing assembly 2 includes a swing plate 21 and a push-pull connecting rod 22; one end of the swing plate 21 is connected to the motor dial 11, and the other end is fixedly connected to the push-pull connecting rod 22; the push-pull connecting rod 22 is also fixedly connected to the input end 310 to transmit the swing amplitude. Further, this embodiment further includes a connecting member 9; a steel sleeve 91 is sleeved on the connecting member 9; the motor dial 11 is provided with a waist-shaped groove 110 that slidably cooperates with the steel sleeve, and one end of the connecting member 9 is slidably cooperated with the waist-shaped groove 110 through the steel sleeve 91 and is fixedly connected to one end of the swing plate 21. The connecting member 9 is preferably a matching screw and nut. The swing plate 21 obtains swing transmission through the sliding cooperation of the steel sleeve 91 and the waist-shaped groove 110.

[0043] More specifically, this embodiment further includes a connecting rod swing shaft 100; the connecting rod swing shaft 100 is installed at the other end of the transmission shaft 31 and is linked with the transmission shaft 31; one end of the connecting rod 41 is connected to the connecting rod swing shaft 100, and the other end is connected to the first moving cutter ring 50.

[0044] Further, the swing rod group 42 includes a mounting plate 421 and a rocker 422. The middle of the mounting plate 421 is inserted on the transmission shaft 31. One end is connected to the connecting rod swing shaft 100, and the other end is connected to one end of the rocker 422. The other end of the rocker 422 is connected to the second moving knife ring 60. In this embodiment, the connecting rod 41 and the swing group 42 can obtain rotational transmission from the transmission shaft 31 through the connecting rod swing shaft 100, which simplifies the structure and has higher transmission accuracy.

[0045] Further, the connecting rod swing shaft is provided with a mounting hole 101 for inserting the transmission shaft 31. The mounting hole 101 is communicated with an opening 102, and the tightness of the opening 102 is adjusted by an adjustable locking member, which is convenient for installation and fixation. The adjustable locking member is preferably an adjusting screw and a matching nut, etc.

[0046] The working principle of this embodiment is as follows: The rotating shaft 10 of the motor 1 rotates and outputs, and the swing is transmitted through the cooperation of the motor paddle 11, the swing plate 21 and the push-pull connecting rod 22. Since the transmission shaft sleeve 30 is fixed, the transmission shaft 31 can only convert the swing obtained at the input end 310 into rotation. And through the amplification of the first swing assembly 2, the output rotation angle of the transmission shaft 31 is greater than the rotation angle of the rotating shaft 10 of the motor. Further, the connecting rod swing shaft 100 is fixedly connected to the transmission shaft 31, and the transmission shaft 31 drives the connecting rod swing shaft 100 to rotate. The first moving knife ring 50 is connected to the connecting rod swing shaft 100 through the connecting rod 41 and obtains a rotational drive in the same direction as the transmission shaft 31. The second moving knife ring 60 is connected to the connecting rod swing shaft 100 through the mounting plate 421 and the rocker 422 and obtains a rotational drive in the opposite direction to the transmission shaft 31. Therefore, when the transmission shaft 31 rotates, it can drive the first moving knife 51 and the second moving knife 61 to rotate in opposite directions at the same time, realizing biting and separation. The biting part is directly below the tip of the needle or near directly below the tip of the needle. Compared with the prior art, the wire cutting position is closer, the wire head is shorter, and the wire cutting efficiency is improved.

[0047] For those skilled in the art, various corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. A double-knife thread trimming device for a computer sewing machine, characterized in that: It includes a motor, a first swing assembly, a transmission shaft assembly, a second swing assembly, a first knife assembly and a second knife assembly; Motor: including a rotating shaft and a motor paddle connected to the rotating shaft; The first swing assembly is connected to the motor paddle, and changes the reciprocating rotation of the rotating shaft into swinging; The transmission shaft assembly includes a fixed transmission sleeve and a transmission shaft rotating in the transmission sleeve; one end of the transmission shaft is provided with a swing input end; the first swing component is transmission-connected with the input end and converts the swing of the first swing component into the rotation of the transmission shaft; The second swing assembly comprises a connecting rod rotatably connected to the first knife group and a swing arm group rotatably connected to the second knife group; the connecting rod and the swing arm group are respectively connected to the transmission shaft in a transmission manner; The first knife group and the second knife group are rotatably mounted on the body of the sewing machine respectively; the connecting rod and the rocker arm group drive the first knife group and the second knife group to rotate in opposite directions under the coaxial rotation of the transmission shaft.

2. A double-knife thread trimming device for a computer sewing machine according to claim 1, characterized in that: The first knife group includes a first movable knife ring and a first movable knife; the first movable knife is installed on the first movable knife ring; the first movable knife ring is rotatably installed on the machine body; the first movable knife ring is connected to one end of the connecting rod.

3. A double-knife thread trimming device for a computer sewing machine according to claim 2, characterized in that: The second knife group includes a second movable knife ring and a second movable knife; the second movable knife is installed on the second movable knife ring; the second movable knife ring is rotatably installed on the machine body; the second movable knife ring is connected to one end of the rocker group; the first movable knife ring and the second movable knife ring are arranged in the same axial direction.

4. The double-knife thread trimming device of a computer sewing machine according to claim 1, characterized in that: The motor is a stepping motor.

5. The double-knife thread trimming device of a computer sewing machine according to claim 1, characterized in that: The first swing assembly includes a swing plate and a push-pull connecting rod; one end of the swing plate is connected to the motor paddle; one end of the push-pull connecting rod is connected to the swing plate, and the other end is connected to the input end.

6. A double-knife thread trimming device for a computer sewing machine according to claim 5, characterized in that: It also includes a connecting piece; the connecting piece is covered with a steel sleeve; the motor paddle is provided with a waist-shaped groove that slides with the steel sleeve, one end of the connecting piece slides with the waist-shaped groove through the steel sleeve, and the other end is fixedly connected to the other end of the swing plate.

7. The double-knife thread trimming device of a computer sewing machine according to claim 1, characterized in that: It also includes a connecting rod swing shaft; the connecting rod swing shaft is installed at the other end of the transmission shaft and is linked with the transmission shaft; one end of the connecting rod is connected to the connecting rod swing shaft, and the other end is connected to the first knife group.

8. The double-knife thread trimming device of a computer sewing machine according to claim 7, characterized in that: The rocker arm assembly includes a mounting plate and a rocker arm. The middle portion of the mounting plate is inserted on the transmission shaft, one end of the mounting plate is connected to the connecting rod rocker shaft, and the other end is connected to one end of the rocker arm; the other end of the rocker arm is connected to the second knife assembly.

9. The double-knife thread trimming device of a computer sewing machine according to claim 7, characterized in that: The connecting rod swing shaft is provided with a mounting hole for inserting the transmission shaft, and the mounting hole is connected with an opening, and the tightness of the opening can be adjusted by an adjustable locking piece.

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