Thread loosening mechanism of sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, and particularly relates to a sewing machine thread loosening mechanism which comprises a machine shell, a main shaft and a driving motor, a first thread trapper and a second thread trapper are arranged on the upper end face of the machine shell, a first thread loosening cam is arranged on the periphery of the main shaft, and a thread loosening shaft pushed by the first thread loosening cam is arranged at the lower end of the first thread trapper. A thread loosening plate is movably arranged on the lower end face of the machine shell, a thread loosening claw used for being clamped into the second thread clamping device is arranged at one end of the thread loosening plate, a thread loosening connecting rod is connected to the other end of the thread loosening plate, a lifting and pressing lever is connected to the other end of the thread loosening connecting rod, and a lifting and pressing cam used for driving the lifting and pressing lever to act is installed on an output shaft of the driving motor. Under the action of the main shaft and the lifting and pressing lever, the thread clamping device I and the thread clamping device II are respectively driven to act, so that the thread loosening action is realized, and compared with the prior art, an additional power source for control is not needed, and the cost can be effectively reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field, especially a sewing machine thread loosening mechanism. BACKGROUND

[0002] Sewing machine is the machine that sewing material is sewn through sewing thread, including needle bar mechanism, thread tension mechanism, feeding mechanism, thread hooking mechanism, pressing mechanism and thread clamping device etc. The thread clamping device of sewing machine is also called thread clamp, which is a device that applies pressure to the sewing thread and can be adjusted. It is usually installed on the head of the sewing machine. A thread loosening mechanism is also provided on the sewing machine to loosen the thread, that is, the thread loosening mechanism acts on the thread clamp to loosen the sewing thread.

[0003] For example, a thread loosening mechanism of a sewing machine is disclosed in Chinese Utility Model Patent No. CN202123046941.3. The installation seat is used to connect with the sewing machine body, and a gas cylinder is provided on the installation seat. The thread loosening plate is movably connected with the installation seat and connected with the gas cylinder. The thread clamp is connected with the sewing machine body and used to clamp the sewing thread. The thread organizer is provided on the installation seat, and a thread organizing groove is formed in the thread organizer. When the gas cylinder drives the thread loosening plate to move horizontally, the thread loosening plate can extend into the thread clamp and make the thread clamp expand.

[0004] In the above prior art, a gas cylinder needs to be separately provided as a power source to drive the thread loosening mechanism to act, which has a high cost. Therefore, further improvement is needed for this structure. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a sewing machine thread loosening mechanism, which solves the problem of high cost through novel structure design.

[0006] The utility model is implemented as follows: a sewing machine thread loosening mechanism includes a machine shell, a main shaft, and a driving motor. The upper end surface of the machine shell is provided with thread clamp one and thread clamp two. The outer periphery of the main shaft is provided with thread loosening cam one. The lower end of thread clamp one is provided with a thread loosening shaft driven by thread loosening cam one. The lower end surface of the machine shell is movably provided with a thread loosening plate. One end of the thread loosening plate is provided with a thread loosening claw for clamping into thread clamp two. The other end of the thread loosening plate is connected with a thread loosening connecting rod. The other end of the thread loosening connecting rod is connected with a lifting and pressing lever. The output shaft of the driving motor is installed with a lifting and pressing cam for driving the lifting and pressing lever to act.

[0007] Preferably, a hinge shaft is provided between the middle end of the thread loosening connecting rod and the machine shell.

[0008] Preferably, one end of the thread loosening connecting rod is provided with a connecting shaft, and the other end of the thread loosening plate is provided with a connecting plate. A strip-shaped hole for installing the connecting shaft is formed in the connecting plate.

[0009] Preferably, one end of the lifting pressure lever is provided with a sliding block, and the other end of the line loosening connecting rod is formed with a U-shaped fork for mounting the sliding block.

[0010] Preferably, a tension spring is connected between one end of the line loosening plate and the shell.

[0011] Preferably, a limiting piece is arranged on the lower end surface of the shell, and a strip-shaped limiting hole for movement of the limiting piece is arranged in the line loosening plate.

[0012] Preferably, a mounting rack is arranged on the lower end surface of the shell, a mounting seat is rotatably connected to the lower end of the mounting rack, a pulley is arranged on the lower end of the mounting seat and used for being pushed by the line loosening cam, and a push plate is formed on the upper end of the mounting seat and used for pushing the line loosening shaft.

[0013] Preferably, a spring is arranged on the outer periphery of the line loosening shaft.

[0014] Compared with the prior art, the utility model has the advantages of being prominent and beneficial.

[0015] The utility model discloses a main shaft and the action of lifting pressure lever are driven respectively to drive line clamp one and line clamp two to act, so that the line loosening action is realized, compared with the prior art, need not set up an additional power source to control, can effectively reduce the cost. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The structure of the utility model is shown Figure One .

[0017] Figure 2 The structure of the utility model is shown Figure Two .

[0018] Figure 3 The structure of the utility model is shown Figure Three .

[0019] Drawing reference: 1 - shell;2 - main shaft;3 - drive motor;4 - line clamp one;5 - line clamp two;6 - line loosening cam one;7 - line loosening shaft;8 - line loosening plate;9 - line loosening claw;10 - line loosening connecting rod;11 - lifting pressure lever;12 - lifting pressure cam;13 - hinged shaft;14 - connecting shaft;15 - connecting plate;16 - strip-shaped hole;17 - sliding block;18 - U-shaped fork;19 - tension spring;20 - limiting piece;21 - strip-shaped limiting hole;22 - mounting rack;23 - mounting seat;24 - pulley;25 - push plate;26 - spring. DETAILED DESCRIPTION

[0020] The specific embodiment of the utility model is further explained in detail in combination with the drawings.

[0021] As Figures 1-3As shown, a sewing machine thread loosening mechanism, including a shell 1, a main shaft 2 and a drive motor 3, the upper end surface of the shell 1 is provided with a thread clamp one 4 and a thread clamp two 5 respectively, the outer periphery of the main shaft 2 is provided with a thread loosening cam one 6, the lower end of the thread clamp one 4 is provided with a thread loosening shaft 7 for the thread loosening cam one 6 to push, the lower end surface of the shell 1 is movably provided with a thread loosening plate 8, one end of the thread loosening plate 8 is provided with a thread loosening claw 9 for clamping into the thread clamp two 5, the other end of the thread loosening plate 8 is connected with a thread loosening connecting rod 10, the other end of the thread loosening connecting rod 10 is connected with a thread pressing lever 11, the output shaft of the drive motor 3 is provided with a thread pressing cam 12 for driving the thread pressing lever 11 to act.

[0022] In the actual working process, first, the drive motor 3 drives the thread pressing cam 12 to rotate through the motor shaft, thereby pushing the thread pressing lever 11 on one side to rotate, and then driving the thread loosening plate 8 to move through the thread loosening connecting rod 10, so that the thread loosening claw 9 is clamped into the two thread clamping discs of the thread clamp two 5, so that the thread clamp loosens the sewing thread, thereby playing a thread loosening role, and then the thread loosening shaft 7 is moved by the thread loosening cam one 6 on the main shaft 2, so that the thread clamp one 4 moves, playing a pulling role on the sewing thread, thereby making the sewing thread be elongated, thereby playing a thread loosening role, therefore, through the action of the main shaft 2 and the thread pressing lever 11, the thread clamp one 4 and the thread clamp two 5 are driven to act respectively, thereby realizing the thread loosening action, compared with the prior art, without the need for an additional power source to control, the cost can be effectively reduced.

[0023] The middle end of the thread loosening connecting rod 10 and the shell 1 are provided with a hinge shaft 13, thereby realizing the rotary installation between the thread loosening connecting rod 10 and the shell.

[0024] One end of the thread loosening connecting rod 10 is provided with a connecting shaft 14, the other end of the thread loosening plate 8 is provided with a connecting plate 15, the connecting plate 15 is provided with a strip-shaped hole 16 for installing the connecting shaft 14, and in the process of left and right rotation of the thread loosening connecting rod 10, the connecting shaft 14 can drive the thread loosening plate 8 to move forward and backward.

[0025] One end of the thread pressing lever 11 is provided with a sliding block 17, the other end of the thread loosening connecting rod 10 is formed with a U-shaped fork 18 for installing the sliding block 17, so that in the process of rotation of the thread pressing lever 11, the thread loosening connecting rod 10 can be driven to rotate simultaneously through the cooperation of the sliding block and the U-shaped fork 18.

[0026] One end of the thread loosening plate 8 and the shell 1 are connected with a tension spring 19, thereby realizing the automatic reset of the thread loosening plate 8.

[0027] The lower end surface of the shell 1 is provided with a limiting piece 20, and the thread loosening plate 8 is provided with a strip-shaped limiting hole 21 for the limiting piece 20 to move, so that the thread loosening plate 8 keeps straight forward and backward movement.

[0028] The lower end surface of the casing 1 is provided with a mounting frame 22, the lower end of the mounting frame 22 is rotatably connected with a mounting seat 23, the lower end of the mounting seat 23 is provided with a pulley 24 for being pushed by the line loosening cam 1 6, the upper end of the mounting seat 23 is formed with a push plate 25 for pushing the line loosening shaft 7, in the actual working process, the line loosening cam 1 6 first pushes the mounting seat 23 to rotate through the pulley 24, and then pushes the line loosening shaft 7 to move through the push plate 25, so that the line clamp moves.

[0029] The outer periphery of the line loosening shaft 7 is provided with a spring 26, so as to realize the automatic reset of the mounting seat 23.

[0030] The basic principle and main features of the utility model and the advantages of the utility model are shown and described above. The skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only for illustrating the principle of the utility model, under the premise of not departing from the spirit and scope of the utility model, the utility model will have various changes and improvements, and these changes and improvements all fall into the scope of the utility model claimed for protection. The scope of protection of the utility model is defined by the appended claims and their equivalents.

Claims

1. A thread loosing mechanism for a sewing machine, characterized in that, The utility model provides a knitting machine, including casing (1), main shaft (2) and drive motor (3), the upper end surface of casing (1) is provided with line clamp one (4) and line clamp two (5) respectively, the outer periphery of main shaft (2) is provided with line loosening cam one (6), the lower end of line clamp one (4) is provided with line loosening shaft (7) that line loosening cam one (6) pushes, the lower end surface of casing (1) is movably provided with line loosening plate (8), one end of line loosening plate (8) is provided with line loosening claw (9) for clamping into line clamp two (5), the other end of line loosening plate (8) is connected with line loosening connecting rod (10), the other end of line loosening connecting rod (10) is connected with lift pressure lever (11), the output shaft of drive motor (3) is installed with lift pressure cam (12) for driving lift pressure lever (11) action.

2. The sewing machine thread-tensioning mechanism of claim 1, wherein: The middle end of the line loosening connecting rod (10) is provided with a hinge shaft (13) between the casing (1).

3. A sewing machine thread-tensioning mechanism according to claim 1 or 2, characterised in that: One end of the line loosening connecting rod (10) is provided with a connecting shaft (14), and the other end of the line loosening plate (8) is provided with a connecting plate (15), and a strip-shaped hole (16) for installing the connecting shaft (14) is formed in the connecting plate (15).

4. The sewing machine thread-tensioning mechanism according to claim 1 or 2, characterized in that: One end of the lift pressure lever (11) is provided with a sliding block (17), and the other end of the line loosening connecting rod (10) is formed with a U-shaped fork (18) for installing the sliding block (17).

5. The sewing machine thread-tensioning mechanism of claim 1, wherein: One end of the line loosening plate (8) is connected with a tension spring (19) between the casing (1).

6. The sewing machine thread-tensioning mechanism of claim 5, wherein: The lower end surface of the casing (1) is provided with a limiting piece (20), and a strip-shaped limiting hole (21) for moving the limiting piece (20) is formed in the line loosening plate (8).

7. The sewing machine thread-tensioning mechanism of claim 1, wherein: The lower end surface of the casing (1) is provided with a mounting frame (22), and the lower end of the mounting frame (22) is rotatably connected with a mounting seat (23), and the lower end of the mounting seat (23) is provided with a pulley (24) for pushing the line loosening cam one (6), and the upper end of the mounting seat (23) is formed with a push plate (25) for pushing the line loosening shaft (7).

8. The sewing machine thread-tensioning mechanism of claim 7, wherein: The outer periphery of the line loosening shaft (7) is provided with a spring (26).

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