Thread passing device of sewing machine

Abstract

The utility model discloses a thread passing device of a sewing machine, which comprises a machine head, the machine head is provided with a thread passing device, and the thread passing device comprises a motor, a mounting frame, a movable thread plate, a positioning frame, a hinge stud, a pressing arm and a hinge spring; the positioning frame is fixed on the mounting frame, one end part of the movable thread plate is rotationally mounted on the mounting frame through a hinge stud, the other end of the movable thread plate corresponds to the positioning frame, and a thread hole for a thread to pass through is formed in the movable thread plate; the hinge spring is sleeved on the hinge stud, one end of the hinge spring abuts against the movable wire plate, the other end of the hinge spring abuts against the positioning frame, the motor is installed on the installation frame, and a motor shaft on the motor penetrates through the hinge stud to be fixedly connected with the pressing arm. When the sewing machine is used for thread drawing, the thread passing device can be well matched with the sewing machine to work and quickly act, and is timely matched with other devices to press threads, so that the sewing machine can better draw the threads, the technical defects of an existing structure are overcome, and the thread residue phenomenon of a bird nest is effectively prevented.

Description

Technical Field

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

[0002] When a sewing machine starts sewing, a certain length of thread end needs to be left at the eye of the sewing needle to ensure that the thread end will not come out of the needle eye during starting sewing. However, a certain length of thread end on the eye of the sewing needle will remain at the initial sewing position of the sewing material during starting sewing, affecting the appearance of the sewing material.

[0003] The traditional method is to manually hold the thread end when starting sewing to make the thread end stay on the sewing material. After the sewing work is finished, the thread end is trimmed manually. The currently more common treatment method is to set an electronic thread clamp in the thread passing channel of the machine head. When starting sewing, the electronic thread clamp acts to clamp the sewing thread for a certain time, so that the suspended thread end is brought under the sewing material during starting sewing, and by clamping the sewing thread, the amount of thread supplied by pulling back the upper thread end of the sewing needle during starting sewing is used to supply the thread, and finally the length of the thread end under the sewing material is shortened. However, this method transfers the thread end under the sewing material, resulting in the problem of a bird's nest thread ball. Therefore, a sliding thread cutting device is configured and set in cooperation with the thread clamping device. During starting sewing, the two devices are used to cut the thread end against the edge of the presser foot.

[0004] Through the above description, it can be known that the thread clamping device is a very important part. Due to the fast operation of the sewing machine, the existing design of the thread clamping device has defects and cannot cooperate well, so further improvement is needed. Summary of the Invention

[0005] The purpose of the utility model is to solve the problems raised in the above background art and provide a thread passing device for a sewing machine.

[0006] To solve the above technical problems, the technical solution of the utility model is: a thread passing device for a sewing machine, including a machine head, a thread passing device is arranged on the machine head. The thread passing device includes a motor, a mounting frame, a movable thread plate, a positioning frame, a hinge stud, a pressing arm, and a hinge spring; the mounting frame is fixed on the machine head, the positioning frame is fixed on the mounting frame, one end of the movable thread plate is rotatably installed on the mounting frame through the hinge stud and the other end corresponds to the positioning frame. A thread passing hole for the sewing thread to pass through is also arranged on the movable thread plate; the hinge spring is sleeved on the hinge stud, one end of the hinge spring abuts against the movable thread plate and the other end abuts against the positioning frame. The motor is installed on the mounting frame, and the motor shaft on the motor passes through the hinge stud and is fixedly connected with the pressing arm. When the motor drives the pressing arm to rotate and form an abutment with the movable thread plate, the elastic force of the hinge spring acts on the movable thread plate, so that the movable thread plate forms an abutment and pressing with the pressing arm, thereby enabling the pressing arm and the movable thread plate to cooperate to clamp the sewing thread passing through the thread passing hole.

[0007] In the above thread-passing device of a sewing machine, a shaft hole is provided on the articulated stud, and the motor shaft of the motor passes through the shaft hole and is fixedly connected to the pressing arm.

[0008] In the above thread-passing device of a sewing machine, a positioning end is provided on the positioning bracket and abuts against the end of the movable thread board. Under the elastic force of the hinge spring, the end of the movable thread board forms a positioning abutment with the positioning end, and there is a gap between the movable thread board and the pressing arm when the sewing thread is in normal use.

[0009] In the above thread-passing device of a sewing machine, a abutting end is provided on the positioning bracket, and one end of the hinge spring abuts against the abutting end.

[0010] In the above thread-passing device of a sewing machine, the movable thread board is provided with a connecting end, and a rotating hole is provided on the connecting end. The articulated stud passes through the rotating hole of the connecting end, so that the movable thread board is rotatably connected to the mounting bracket.

[0011] In the above thread-passing device of a sewing machine, a supporting boss is provided on the mounting bracket, and the connecting end of the movable thread board is supported by the supporting boss.

[0012] In the above thread-passing device of a sewing machine, the motor is a stepping motor.

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

[0014] When the sewing machine performs thread extraction, the thread-passing device designed by the utility model can cooperate well with the sewing machine to work quickly, and cooperate with other devices in time for pressing the thread, so that the sewing machine can better perform the thread extraction action, solve the technical defects existing in the existing structure, and effectively prevent the phenomenon of bird's nest thread ends. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 、 Figure 2 are perspective views of the thread-passing device of the utility model in two different directions;

[0016] Figure 3 is an exploded view of the thread-passing device of the utility model

[0017] Figure 4 is a perspective view of the utility model. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] The present utility model will be further described in conjunction with the accompanying drawings.

[0019] Please refer to Figures 1 to 4, the present utility model provides a thread passing device for a sewing machine, including a machine head 1, on which a thread passing device 2 is arranged. The thread passing device 2 includes a motor 3, a mounting bracket 4, a movable thread plate 5, a positioning bracket 6, a hinged stud 7, a pressing arm 8, and a hinge spring 9.

[0020] The mounting bracket 4 is fixed on the machine head 1, and the positioning bracket 6 is fixed on the mounting bracket 4. One end of the movable thread plate 5 is rotatably mounted on the mounting bracket 4 through the hinged stud 7, and the other end corresponds to the positioning bracket 6. A thread passing hole 10 for the sewing thread to pass through is provided on the movable thread plate 5. Specifically, the movable thread plate 5 is provided with a connection end 14, and the connection end 14 is provided with a rotation hole 15. The hinged stud 7 passes through the rotation hole 15 of the connection end 14, so that the movable thread plate 5 forms a rotational connection with the mounting bracket 4.

[0021] The hinge spring 9 is sleeved on the hinged stud 7. One end of the hinge spring 9 abuts against the movable thread plate 5, and the other end abuts against the positioning bracket 6. The positioning bracket 6 is provided with a positioning end 12 that abuts against the end of the movable thread plate 5. The positioning bracket 6 is provided with an abutting end 13, and the other end of the hinge spring 9 abuts against the abutting end 13. The end of the movable thread plate 5 forms a positioning abutment with the positioning end 12 under the elastic force of the hinge spring 9, and at the same time, there is a gap between the movable thread plate 5 and the pressing arm 8 in the normal use state of the sewing thread.

[0022] The motor 3 is installed on the mounting bracket 4. Preferably, the motor 3 is a stepping motor. The hinged stud 7 is provided with a shaft hole 11, and the motor shaft 3-1 of the motor 3 passes through the shaft hole 11 and is fixedly connected to the pressing arm 8.

[0023] When it is necessary to cooperate for the wire pressing action, the motor 3 drives the pressing arm 8 to rotate and abut against the movable thread plate 5. The elastic force of the hinge spring 9 acts on the movable thread plate 5, so that the movable thread plate 5 forms an abutting and pressing with the pressing arm 8, thereby enabling the pressing arm 8 and the movable thread plate 5 to cooperate to clamp the sewing thread passing through the thread passing hole 10.

[0024] Furthermore, a support boss 16 is provided on the mounting bracket 4, and the support boss 16 supports the connection end 14 of the movable thread plate 5.

[0025] The above has introduced in detail a thread passing device for a sewing machine provided by the embodiments of the present utility model. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the technical solution disclosed by the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present utility model.

Claims

1. A thread-passing device for a sewing machine, comprising a machine head (1), characterized in that: A wire-passing device (2) is provided on the machine head (1). The wire-passing device (2) includes a motor (3), a mounting bracket (4), a movable wire board (5), a positioning bracket (6), a hinged stud (7), a pressing arm (8), and a hinge spring (9). The mounting bracket (4) is fixed on the machine head (1), and the positioning bracket (6) is fixed on the mounting bracket (4). One end of the movable wire board (5) is rotatably mounted on the mounting bracket (4) through the hinged stud (7), and the other end corresponds to the positioning bracket (6). A wire-passing hole (10) for the sewing thread to pass through is provided on the movable wire board (5). The hinge spring (9) is sleeved on the hinged stud (7), one end of the hinge spring (9) abuts against the movable wire board (5), and the other end abuts against the positioning bracket (6). The motor (3) is mounted on the mounting bracket (4), and the motor shaft (3-1) on the motor (3) passes through the hinged stud (7) and is fixedly connected to the pressing arm (8). When the motor (3) drives the pressing arm (8) to rotate and abut against the movable wire board (5), the elastic force of the hinge spring (9) acts on the movable wire board (5) so that the movable wire board (5) abuts against and presses the pressing arm (8), thereby enabling the pressing arm (8) and the movable wire board (5) to cooperate to clamp the sewing thread passing through the wire-passing hole (10).

2. The thread passing device of a sewing machine according to claim 1, characterized in that: A shaft hole (11) is provided on the hinged stud (7), and the motor shaft (3-1) of the motor (3) passes through the shaft hole (11) and is fixedly connected to the pressing arm (8).

3. The thread passing device of a sewing machine according to claim 1, characterized in that: A positioning end (12) for abutting against the end of the movable wire board (5) is provided on the positioning bracket (6). The end of the movable wire board (5) forms a positioning abutment with the positioning end (12) under the elastic force of the hinge spring (9), and there is a gap between the movable wire board (5) and the pressing arm (8) in the normal use state of the sewing thread.

4. The thread passing device of a sewing machine according to claim 1, characterized in that: An abutting end (13) is provided on the positioning bracket (6), and one end of the hinge spring (9) abuts against the abutting end (13).

5. The thread passing device of a sewing machine according to claim 3, characterized in that: A connection end (14) is provided on the movable wire board (5), a rotation hole (15) is provided on the connection end (14), and the hinged stud (7) passes through the rotation hole (15) of the connection end (14) so that the movable wire board (5) is rotatably connected to the mounting bracket (4).

6. The thread passing device of a sewing machine according to claim 5, characterized in that: A support boss (16) is provided on the mounting bracket (4), and the support boss (16) supports the connection end (14) of the movable wire board (5).

7. The thread guiding device of a sewing machine according to claim 1 or 2, characterized in that: The motor (3) is a stepper motor.

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