Threading mechanism of sewing machine

Abstract

The threading mechanism comprises a thread hooking plate and a thread hooking plate mounting frame, the thread hooking plate is adjustably connected with the thread hooking plate mounting frame, and the position of the thread hooking plate can be adjusted up and down. The thread hooking plate is installed on the installation block through the adjusting rod, and the thread hooking plate installation frame is rotatably connected to the adjusting rod and can drive a thread hook of the thread hooking plate to rotate to penetrate through a needle hole of the needle rod and is used for assisting threading. A first adjusting structure is arranged on the adjusting rod and can adjust the extending distance of the adjusting rod relative to the mounting block so as to adjust the position of the wire hooking plate left and right. A limiting rod is further arranged on the mounting block and used for limiting the front-back distance between the thread hooking plate and the needle rod, the length of the limiting rod can be adjusted, and the limiting rod abuts against the thread hooking plate mounting frame so as to adjust the front-back position of the thread hooking plate. The vertical, left-right and front-back positions of the thread hooking plate can be adjusted, the thread hooking plate can be accurately adjusted, the thread hooking plate can be aligned to a needle hole of a needle rod, the thread hooking plate can smoothly penetrate through the needle hole to assist threading, and the thread hooking plate is prevented from colliding with or deviating from the needle hole.

Description

Technical Field

[0001] The invention relates to the technical field of sewing machines, in particular to a threading device of a sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. Traditional sewing machines usually require manual threading of the needle bar, and the needle hole on the needle bar is small, making threading difficult, time-consuming, labor-intensive, and inefficient. Therefore, many mechanisms for assisting threading have emerged. The threading mechanism includes a thread take-up rod. When threading, the thread take-up rod first passes through the needle hole, and then the thread is placed on the thread take-up rod. The thread take-up rod returns to the needle hole and takes the thread out of the needle hole to complete the threading.

[0003] Since the thread take-up rod needs to be inserted into the needle hole to assist in threading, the position of the thread take-up rod must be as accurate as possible and aligned with the needle hole of the needle bar. However, the position of the existing thread take-up rod is not easy to adjust. Once an error occurs during installation of the needle bar and the thread take-up rod, the thread take-up rod cannot be aligned with the needle hole, affecting threading. Summary of the invention

[0004] In order to solve the above problems of the prior art, the present invention provides a threading mechanism for a sewing machine, which can help the sewing machine to thread quickly, and the position can be adjusted in multiple directions to meet the position of the needle bar and facilitate threading.

[0005] The technical solutions adopted are as follows:

[0006] A threading mechanism of a sewing machine comprises a needle bar, a thread hooking plate arranged corresponding to the needle bar, a thread hooking plate mounting frame for mounting the thread hooking plate, and a mounting block arranged on the needle bar or other mounting rods outside the needle bar. The thread hooking plate mounting frame is rotatably connected to the mounting block through an adjusting rod, the mounting block is provided with at least one mounting hole for mounting the adjusting rod, the mounting block is provided with at least one first adjusting structure for adjusting the distance of the adjusting rod extending out of the mounting block and fixing it, the mounting block is provided with a limiting rod for limiting the distance between the thread hooking plate mounting frame and the needle bar, the thread hooking plate is arranged on the thread hooking plate mounting frame so as to be adjustable up and down, a second adjusting structure is provided between the thread hooking plate and the thread hooking plate mounting frame, and the front end of the thread hooking plate is provided with a thread hook which can be inserted into the thread threading hole of the machine needle on the needle bar.

[0007] Furthermore, the mounting rod is a presser foot rod.

[0008] Furthermore, the first adjustment structure is at least one first adjustment bolt which is arranged on the mounting block and can pass through the side wall of the mounting hole to fix the adjustment rod.

[0009] Furthermore, a torsion spring is provided between the adjusting rod and the wire hook plate mounting frame.

[0010] Furthermore, a limit frame for limiting the rotation range of the thread hook plate mounting bracket is provided at one end of the mounting block away from the needle rod.

[0011] Furthermore, the mounting block is provided with two mounting holes arranged in sequence up and down, and the limiting rods are correspondingly provided with two.

[0012] Furthermore, the second adjustment structure includes a connecting plate connected to the wire hook plate, at least one pair of corresponding waist-shaped grooves provided on the wire hook plate and the connecting plate, and at least one second adjustment bolt provided in the waist-shaped groove for connecting and fixing the wire hook plate and the wire hook plate mounting frame.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention provides a threading mechanism for a sewing machine, comprising a thread hooking plate and a thread hooking plate mounting frame, wherein the thread hooking plate and the thread hooking plate mounting frame are adjustably connected, and the position of the thread hooking plate can be adjusted up and down. The thread hooking plate is mounted on a mounting block through an adjusting rod, and the thread hooking plate mounting frame is rotatably connected to the adjusting rod, and can drive the thread hook of the thread hooking plate to rotate and pass through the needle hole of the needle bar, so as to assist threading. The adjusting rod is provided with a first adjusting structure, and the distance of the adjusting rod extending relative to the mounting block can be adjusted to adjust the position of the thread hooking plate left and right. The mounting block is also provided with a limiting rod to limit the front and rear distance between the thread hooking plate and the needle bar, and the length of the limiting rod is adjustable, and it is pressed against the thread hooking plate mounting frame to adjust the front and rear position of the thread hooking plate. The "front and rear" refers to the direction of approaching or moving away from the machine needle; the "left and right" refers to the direction of approaching or moving away from the mounting block. The present invention can adjust the up and down, left and right, front and back positions of the thread hooking plate, and can accurately adjust the thread hooking plate so that the thread hooking plate is aligned with the needle hole of the needle bar, and the thread hooking plate can smoothly pass through the needle hole to assist threading, and prevent the thread hooking plate from colliding with or deviating from the needle hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 , 2 7 are schematic diagrams of the structure of the present invention at different angles;

[0016] Figure 3 for Figure 2 Enlarged view of point a;

[0017] Figure 4 It is a partial structural schematic diagram of the present invention;

[0018] Figure 5 This is a partial structural disassembly diagram of the present invention;

[0019] Figure 6 is a perspective view of the present invention;

[0020] Among them, there are a thread hook plate 1, a thread hook plate mounting frame 2, a mounting block 3, an adjusting rod 4, a first adjusting structure 5, a first adjusting bolt 501, a limiting rod 6, a needle rod 7, a mounting rod 8, a limiting frame 9, a second adjusting structure 10, a waist-shaped groove 1001, a second adjusting bolt 1002, a connecting plate 1003, a needle hole 11, a mounting hole 12, a torsion spring 13, and a thread hook 14. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with specific embodiments.

[0022] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and should not be understood as limiting the present invention. The "front and back" mentioned above refers to the direction in which the thread hook plate approaches or moves away from the machine needle; the "left and right" mentioned above refers to the direction in which the thread hook plate approaches or moves away from the mounting block.

[0023] refer to Figure 1-7 , a threading mechanism of a sewing machine, comprising a needle bar 7, a thread hooking plate 1 arranged corresponding to the needle bar, a thread hooking plate mounting frame 2 for mounting the thread hooking plate 1, and a mounting block 3 arranged on the needle bar or with other mounting rods 8 outside the needle bar, the thread hooking plate mounting frame 2 is rotatably connected to the mounting block 3 through an adjusting rod 4, the mounting block 3 is provided with at least one mounting hole 12 for mounting the adjusting rod 4, the mounting block 3 is provided with at least one first adjusting structure 5 for adjusting the distance of the adjusting rod 4 extending out of the mounting block and fixed at a corresponding position of the mounting block 3, the mounting block 3 is provided with a limiting rod 6 for limiting the distance between the thread hooking plate mounting frame 2 and the needle bar, the thread hooking plate 1 is arranged on the thread hooking plate mounting frame 2 so as to be adjustable up and down, a second adjusting structure 10 is provided between the thread hooking plate 1 and the thread hooking plate mounting frame 2, and a thread hook 14 is provided at the front end of the thread hooking plate 1 which can be inserted into the needle threading hole on the needle bar 7.

[0024] The thread hook needs to pass through the needle hole 11 on the needle bar, and after passing through, the upper thread is placed on the thread hook 14, and then the thread hook plate 1 is driven to reset, so that the upper thread can be brought out of the needle hole to complete the threading. The thread hook plate 1 can be driven manually or electrically controlled, and the drive motor can be used to drive the thread hook plate 1 to take up the thread.

[0025] Since the needle hole is small, if you want the thread hook plate 1 to pass through the needle hole smoothly, the thread hook plate 1 needs to be aligned with the needle hole. During installation, the accuracy of the position of the thread hook plate 1 is high and the tolerance rate is small. Therefore, an adjustment structure is set to control the position of the thread hook plate 1 so that the thread hook plate 1 is accurately aligned with the needle hole to facilitate threading.

[0026] In this embodiment, the mounting rod 8 is a presser foot rod.

[0027] The first adjustment structure 5 is at least one first adjustment bolt 501 provided on the mounting block 3 and capable of passing through the side wall of the mounting hole to fix the adjustment rod. Preferably, two first adjustment bolts 501 are provided. The adjustment rod 4 can slide in the mounting hole 12. Before adjustment, the first adjustment bolt 501 is loosened, and the adjustment rod 4 is manually adjusted to change the length of the adjustment rod 4 extending relative to the mounting block 3, that is, the left and right positions of the thread hooking plate 1 are adjusted so that the thread hooking plate 1 is aligned with the middle position of the needle hole, so that the thread hooking plate 1 can smoothly pass through the needle hole without friction and collision with the two sides of the needle hole.

[0028] A torsion spring 13 is provided between the adjusting rod 4 and the hooking plate mounting frame 2. The hooking plate mounting frame 2 is rotated manually or by a motor to make the hooking plate 1 pass through the pinhole 11, and the torsion spring 13 is provided for easy reset. It can be reset only by the torsion spring 13, or it can be reset manually or electrically in combination with the torsion spring 13, which is more labor-saving.

[0029] The end of the mounting block 3 away from the needle rod is provided with a limit frame 9 for limiting the rotation range of the thread hooking plate mounting frame 2.

[0030] The mounting block 3 is provided with two mounting holes 12 arranged in sequence from top to bottom, and the limiting rods 6 are provided with two corresponding ones. By changing the mounting position, the position of the thread hooking plate 1 can also be controlled. In this embodiment, only one mounting hole 12 is provided, and the adjusting rod 4 and the thread hooking plate mounting frame 2 correspond to the limiting rod 6 at the lower end. The limiting rod 6 is set to support the thread hooking plate mounting frame 2 in order to control the distance between the thread hooking plate 1 and the needle hole, and prevent the thread hooking plate 1 from being too close to the needle bar and colliding with the needle bar to cause damage. The limiting rod 6 is adjustably arranged on the mounting block 3, and the protruding length of the limiting rod can be adjusted to control the front and rear position of the thread hooking plate.

[0031] The second adjustment structure 10 comprises a connecting plate 1003 connected to the thread hooking plate 1, at least one pair of corresponding waist-shaped grooves 1001 provided on the thread hooking plate 1 and the connecting plate 1003, and at least one second adjustment bolt 1002 provided in the waist-shaped groove 1001 for connecting and fixing the thread hooking plate and the thread hooking plate mounting frame. Preferably, the thread hooking plate 1 is provided between the connecting plate 1003 and the thread take-up mounting frame 2. The thread hooking plate 1 is provided with two pairs of waist-shaped grooves 1001 and two corresponding second adjustment bolts 1002 on the connecting plate 1003. The position of the thread hooking plate 1 can be adjusted by loosening the second adjustment bolts 1002, and then fixed by tightening the second adjustment bolts 1002.

[0032] The thread hooking plate 1 of the present invention can be adjusted in all directions, and the installation error can be reduced through adjustment, so that the position of the thread hooking plate 1 can be made more accurate. The thread hooking plate 1 can accurately enter the needle hole and complete the thread hooking and perforating, and is not prone to collision and wear.

[0033] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A threading mechanism for a sewing machine, comprising a needle bar (7), a thread hooking plate (1) arranged corresponding to the needle bar, a thread hooking plate mounting frame (2) for mounting the thread hooking plate (1), and a mounting block (3) arranged on the needle bar or on another mounting rod (8) outside the needle bar, characterized in that: The thread hooking plate mounting frame (2) is rotatably connected to the mounting block (3) through an adjusting rod (4); the mounting block (3) is provided with at least one mounting hole (12) for mounting the adjusting rod (4); the mounting block (3) is provided with at least one first adjusting structure (5) for adjusting the distance of the adjusting rod (4) extending out of the mounting block and fixing the adjusting rod; the mounting block (3) is provided with a limit rod (6) for limiting the distance between the thread hooking plate mounting frame (2) and the needle bar; the thread hooking plate (1) is arranged on the thread hooking plate mounting frame (2) so as to be adjustable up and down; a second adjusting structure (10) is provided between the thread hooking plate (1) and the thread hooking plate mounting frame (2); the front end of the thread hooking plate (1) is provided with a thread hook (14) which can be inserted into the needle threading hole on the needle bar (7).

2. The threading mechanism of a sewing machine according to claim 1, characterized in that: The mounting rod (8) is a presser foot rod.

3. The threading mechanism of a sewing machine according to claim 1, characterized in that: The first adjustment structure (5) is at least one first adjustment bolt (501) which is arranged on the mounting block (3) and can pass through the side wall of the mounting hole to fix the adjustment rod.

4. The threading mechanism for a sewing machine according to claim 1, characterized in that: A torsion spring (8) is provided between the adjusting rod (4) and the thread hook plate mounting frame (2).

5. The threading mechanism for a sewing machine according to claim 1, characterized in that: The end of the mounting block (3) away from the needle rod is provided with a limit frame (9) for limiting the rotation range of the thread hook plate mounting frame (2).

6. The threading mechanism for a sewing machine according to claim 1, characterized in that: The mounting block (3) is provided with two mounting holes (12) arranged in sequence up and down, and two limiting rods (6) are correspondingly provided.

7. The threading mechanism for a sewing machine according to claim 1, characterized in that: The second adjustment structure (10) comprises a connecting plate (1003) connected to the wire hooking plate (1), at least one pair of corresponding waist-shaped grooves (1001) provided on the wire hooking plate (1) and the connecting plate (1003), and at least one second adjustment bolt (1002) provided in the waist-shaped groove (1001) for connecting and fixing the wire hooking plate and the wire hooking plate mounting frame.

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