Thread loosening mechanism and sewing machine

Abstract

The utility model relates to the field of sewing machines, in particular to a thread loosening mechanism and a sewing machine, which comprises a mounting seat provided with a first mounting piece, and further comprises a thread trapper mounted on the mounting seat and used for clamping a needle thread; the thread loosening plate is in separable contact with the thread clamping device and is used for loosening the needle thread; the driving part is used for driving the wire loosening plate; the floating type thread loosening device has the advantages that the air cylinder and the thread loosening plate can be connected in a floating mode, high assembling precision is not needed, and the thread clamping device can be opened.

Description

Technical Field

[0001] The utility model relates to the field of sewing machines, in particular to a thread loosening mechanism and a sewing machine. Background Art

[0002] Generally, the overlock sewing machine performs a thread cutting action after sewing is completed. In order to ensure that there are relatively short thread ends remaining on the fabric, the needle and thread are placed as close to the cutter as possible. The method of implementing this in the prior art is that after sewing is completed, the thread clamp is opened (the thread clamp clamps the needle and thread by two clips, and the needle and thread maintain a certain thread tension. Opening means opening the two clips to release the needle and thread), the needle and thread are blown toward the cutter by a high-speed airflow, and then the thread is cut, so as to achieve relatively short thread ends remaining on the fabric.

[0003] The way to achieve opening in the prior art is to fix a wire release plate on the push rod of the cylinder. Since the cylinder moves in a straight line, even a skilled operator still needs to adjust the positional relationship between the wire clamp and the wire release plate during the assembly process, otherwise the wire clamp cannot be opened or is opened poorly, affecting the wire cutting effect.

[0004] Therefore, it is necessary to invent a thread loosening mechanism and a sewing machine. Utility Model Content

[0005] To this end, the utility model provides a thread loosening mechanism and a sewing machine, which adopt a floating connection between the cylinder and the thread loosening plate, do not require high assembly accuracy, and can also open the thread clamp to solve the problems raised in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a wire loosening mechanism, including a mounting seat, a mounting plate 1 is arranged on the mounting seat, and also includes:

[0007] A thread clamp, mounted on the mounting seat, for clamping the needle and thread;

[0008] A thread loosening plate, detachably contacting the thread clamp, for loosening the needle thread;

[0009] A driving member, used for driving the wire release plate;

[0010] A connecting component movably connects the wire release plate and the driving member.

[0011] Preferably, a strip-shaped slide groove is provided on the wire loosening plate, and the strip-shaped slide groove passes through two positioning pins, and the two positioning pins are fixed on the mounting seat. The wire loosening plate is also provided with a second mounting plate.

[0012] Preferably, the driving member is configured as a cylinder, and an end of the cylinder is fixed on a mounting plate.

[0013] Preferably, the connecting assembly includes a base, a shell and a connecting rod, one end of the base is fixedly connected to the end of the cylinder output shaft, the other end of the base is provided with a hemispherical concave surface 1, the shell is installed at the other end of the base, and a hemispherical concave surface 2 is opened inside the shell, and the hemispherical concave surface 1 and the hemispherical concave surface 2 correspond to form a spherical chamber.

[0014] Preferably, one end of the connecting rod passes through the shell, and a ball head matched with the spherical chamber is fixed to one end of the connecting rod, and the other end of the connecting rod passes through the second mounting plate, and the connecting rod is threadedly connected with a screw.

[0015] A sewing machine comprises a thread loosening mechanism as described in any one of the above items.

[0016] The beneficial effect of the utility model is that through the coordinated use of the arranged mounting seat, mounting plate, wire clamp, wire release plate, driving member and connecting assembly, the cylinder and the wire release plate can be connected in a floating manner, high assembly accuracy is not required, and the wire clamp can also be opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A structural stereogram provided for the utility model;

[0018] Figure 2 A structural stereogram of the mounting base provided by the utility model;

[0019] Figure 3 A structural stereogram of the loose wire board provided by the utility model;

[0020] Figure 4 A partial structural sectional view of the connection assembly provided by the utility model;

[0021] Figure 5 This is a structural stereogram provided by the utility model.

[0022] In the figure: 1, mounting seat; 11, mounting plate 1; 2, wire clamp; 3, wire release plate; 31, strip slide; 32, positioning pin; 33, mounting plate 2; 4, cylinder; 5, base; 51, hemispherical concave surface 1; 52, shell; 53, hemispherical concave surface 2; 54, connecting rod; 55, ball head; 56, screw. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0024] Please refer to the attached Figure 1-5The utility model provides a thread loosening mechanism, comprising a mounting seat 1, on which a mounting plate 11 is provided, and a thread clamp 2, which is mounted on the mounting seat 1 and is used to clamp the needle and thread; a thread loosening plate 3, which is detachably in contact with the thread clamp 2 and is used to loosen the needle and thread; a driving member, which is used to drive the thread loosening plate 3; and a connecting component, which movably connects the thread loosening plate 3 and the driving member;

[0025] The loosening plate 3 is provided with a strip-shaped slide groove 31, through which two positioning pins 32 are passed, and the two positioning pins 32 are fixed on the mounting seat 1, so that the loosening plate 3 can be slidably mounted on the mounting seat 1, and the loosening plate 3 is also provided with a second mounting piece 33;

[0026] The driving member is set as a cylinder 4, the end of the cylinder 4 is fixed on a mounting plate 11, and when the cylinder 4 is running, it can drive the wire loosening plate 3;

[0027] The connecting assembly includes a base 5, a shell 52 and a connecting rod 54. One end of the base 5 is fixedly connected to the end of the output shaft of the cylinder 4. The other end of the base 5 is provided with a hemispherical concave surface 1 51. The shell 52 is installed at the other end of the base 5 by threaded connection, and a hemispherical concave surface 2 53 is opened inside the shell 52. The hemispherical concave surface 1 51 and the hemispherical concave surface 2 53 form a spherical chamber correspondingly. One end of the connecting rod 54 passes through the shell 52, and a ball head 55 adapted to the spherical chamber is fixed to one end of the connecting rod 54, that is, The hemispherical concave surface 1 51 and the hemispherical concave surface 2 53 correspond to form a spherical chamber that can be flexibly connected to the ball head 55 (equivalent to a ball pair), so that the connecting rod 54 and the loose wire plate 3 are flexibly connected, no longer rigidly connected, so that the cylinder 4 and the loose wire plate 3 are connected in a floating manner, which does not require high assembly accuracy and can also open the wire clamp 2. The other end of the connecting rod 54 passes through the mounting plate 2 33, and the connecting rod 54 is threadedly connected with a screw 56, so that the connecting component can be easily disassembled and assembled between the loose wire plate 3 and the mounting seat 1.

[0028] A sewing machine comprises a thread loosening mechanism as described in any one of the above items.

[0029] The above is only a preferred embodiment of the utility model. Any person skilled in the art can modify the utility model by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent replacement based on the technical solution of the utility model shall fall within the scope of protection claimed by the utility model.

Claims

1. A wire loosening mechanism, comprising a mounting seat (1), a mounting plate (11) being provided on the mounting seat (1), characterized in that: Also includes, A thread clamp (2), mounted on the mounting seat (1) and used for clamping the needle and thread; A thread loosening plate (3) detachably contacting the thread clamp (2) for loosening the needle thread; A driving member, used for driving the wire release plate (3); A connecting component movably connects the wire release plate (3) and the driving member.

2. A wire loosening mechanism according to claim 1, characterized in that: The loosening plate (3) is provided with a strip-shaped slide groove (31), the strip-shaped slide groove (31) passes through two positioning pins (32), the two positioning pins (32) are both fixed on the mounting seat (1), and the loosening plate (3) is also provided with a second mounting piece (33).

3. A wire loosening mechanism according to claim 2, characterized in that: The driving member is configured as a cylinder (4), and the end of the cylinder (4) is fixed on a mounting plate (11).

4. A wire loosening mechanism according to claim 3, characterized in that: The connecting assembly comprises a base (5), a shell (52) and a connecting rod (54); one end of the base (5) is fixedly connected to the end of the output shaft of the cylinder (4); the other end of the base (5) is provided with a hemispherical concave surface 1 (51); the shell (52) is mounted on the other end of the base (5); a hemispherical concave surface 2 (53) is provided inside the shell (52); the hemispherical concave surface 1 (51) and the hemispherical concave surface 2 (53) correspond to form a spherical chamber.

5. A wire loosening mechanism according to claim 4, characterized in that: One end of the connecting rod (54) passes through the housing (52), and a ball head (55) matching the spherical chamber is fixed to one end of the connecting rod (54); the other end of the connecting rod (54) passes through the second mounting plate (33), and the connecting rod (54) is threadedly connected with a screw (56).

6. A sewing machine, characterized in that: It comprises a wire loosening mechanism as described in any one of claims 1 to 5.

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