Bidirectionally-driven thread trimming device for embroidery machine

Abstract

A bidirectional driving thread trimming device for an embroidery machine comprises more than two rotating shuttle boxes for the embroidery machine, the rotating shuttle boxes are mounted on a support, thread trimming devices are mounted in the rotating shuttle boxes and driven by thread trimming pull rods, and a bidirectional driving device is mounted between a first rotating shuttle box and a second rotating shuttle box which are adjacent in the rotating shuttle boxes. The bidirectional driving device comprises a connecting seat connected with the trimming pull rod, and the connecting seat is connected with a connecting rod driving device through a guide rail device. The bidirectional driving device is installed between the first rotating shuttle box and the second rotating shuttle box, the thread trimming pull rod is driven to provide right-to-left active driving force for the first rotating shuttle box and provide left-to-right active driving force for the second rotating shuttle box, and the bidirectional active driving force of the whole rotating shuttle box is achieved; and the problem of power attenuation caused by traditional one-way driving is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of embroidery machine equipment, in particular to a bidirectionally driven thread trimmer for an embroidery machine. Background Art

[0002] Computer embroidery machines are machines that use embroidery threads to embroider patterns on fabrics. Patterns with rich content are embroidered with embroidery threads of different colors. In the process of embroidering such patterns, it is often necessary to switch between embroidery threads of different colors. When switching embroidery threads, the embroidery threads of the previous colors need to be cut off. If the embroidery threads are cut manually, the working efficiency of the embroidery machine is low and the labor intensity of the operator is high. Therefore, most existing computer embroidery machines are equipped with automatic thread cutting devices.

[0003] A Chinese utility model patent (patent number: 200720111113.4) discloses a thread trimming device for an embroidery machine, which is arranged on the needle plate of the embroidery machine. The device is composed of a moving knife, a fixed knife, and a moving knife driving mechanism for controlling the movement of the moving knife. The moving knife and the fixed knife are arranged in a moving knife assembly which is also arranged on the needle plate. The moving knife can overlap with the fixed knife under the control of the moving knife driving mechanism. The needle plate is also provided with a thread catching device for pressing the end of the bottom thread during the process of the moving knife hooking and thread trimming. After the thread trimming is completed, the thread catcher captures and positions the cut end of the bottom thread, so as to facilitate the start of the next sewing action.

[0004] In the above-mentioned prior art, since most of the current computer embroidery machines are multi-head structures, that is, a large number of heads and matching hook boxes are installed on an embroidery machine beam, and each hook box is installed with a thread trimming device, that is, a large number of thread trimming devices are driven by a driving device, which is installed at one end of the thread trimming pull rod. The movement of the thread trimming device is achieved by controlling the left and right movement of the thread trimming pull rod. This driving method will cause attenuation of force transmission when the thread trimming pull rod is long, that is, the driving force at one end of the thread trimming pull rod is inconsistent with the driving force at the other end, resulting in deviation in the thread trimming action of the thread trimming device. How to solve the problem of force attenuation at both ends of the thread trimming pull rod existing in a large number of thread trimming devices is the object of study for technicians in this field. Utility Model Content

[0005] The utility model provides a bidirectionally driven thread trimming device which has a simple structure and small force attenuation at both ends of a thread trimming pull rod and is suitable for an embroidery machine with multiple machine heads.

[0006] A bidirectionally driven thread trimming device for an embroidery machine comprises more than two rotary hook boxes for the embroidery machine, the rotary hook boxes being mounted on a bracket, the rotary hook boxes being equipped with a thread trimming device, the thread trimming device being driven by a thread trimming pull rod, a bidirectional driving device being mounted between the thread trimming devices of a first rotary hook box and a second rotary hook box adjacent to each other in the rotary hook boxes, the bidirectional driving device comprising a connecting seat connected to the thread trimming pull rod, the connecting seat being connected to a connecting rod driving device via a guide rail device, the guide rail device driving the connecting seat to move left and right, the connecting rod driving device swings the thread trimming connecting rod to achieve left and right movement of a slider of the guide rail device. The bidirectional driven thread trimming device for the embroidery machine is installed between the thread trimming device of the adjacent first rotary hook box and the thread trimming device of the second rotary hook box, and the thread trimming pull rod is driven by the bidirectional driving device to realize the thread trimming function of the thread trimming device installed in the first rotary hook box and the second rotary hook box. Since the bidirectional driving device is located between the thread trimming device of the first rotary hook box and the thread trimming device of the second rotary hook box, the force attenuation at both ends of the thread trimming pull rod is less affected than the traditional single-sided driving structure, and a larger number of rotary hook boxes can be applied, and the thread trimming pull rod with a longer distance can be adapted to avoid technical failures caused by the attenuation of driving force. In the utility model, the connecting seat is connected to the connecting rod driving device through the guide rail device, and the connecting rod driving device transmits the driving force to the guide rail device, and then the guide rail device drives the thread trimming pull rod connected to the connecting seat to move, and finally realizes the operation of the thread trimming device. This driving structure with the guide rail device as an intermediate medium greatly improves the driving force relative to the thread trimming pull rod, and also improves the stability of the operation of the thread trimming pull rod.

[0007] The guide rail device comprises a guide rail base connected to a bracket, the guide rail base is equipped with a horizontally arranged guide rail, the guide rail cooperates with a slider, one side of the slider is connected to a connecting seat, and the other side is connected to a connecting rod driving device through a fixing pin. The slider moves along the guide rail, which improves the stability of the movement of the connecting seat, that is, improves the running stability of the thread trimming pull rod connected to the connecting seat.

[0008] The connecting rod driving device comprises a motor, the motor drives the main shaft to rotate, the main shaft drives the swing arm to swing to realize the left and right movement of the thread trimming connecting rod, the thread trimming connecting rod is connected to the slide block, and drives the slide block to move left and right.

[0009] The thread trimming device comprises a cutter connecting rod connected to a thread trimming rod, wherein the cutter connecting rod is connected to one end of a first connecting rod, the other end of the first connecting rod is connected to one end of a second connecting rod, the other end of the second connecting rod is connected to one end of a cutter rotating shaft, the other end of the cutter rotating shaft is connected to a movable cutter, the movable cutter cooperates with a fixed cutter installed on the base of the rotary hook box, the movable cutter rotates under the drive of the cutter rotating shaft, and the movable cutter cooperates with the fixed cutter to realize the thread trimming function. The cutter connecting rod is vertically connected to the thread trimming rod, and the cutter connecting rod and the cutter rotating shaft are parallel to each other, thereby improving the transmission stability.

[0010] The utility model discloses a bidirectionally driven thread trimming device for an embroidery machine. The bidirectional driving device is installed between the thread trimming device of a first rotary hook box and the thread trimming device of a second rotary hook box. The thread trimming pull rod is driven to provide an active driving force from right to left to the thread trimming device of the first rotary hook box, and an active driving force from left to right to the thread trimming device of the second rotary hook box. Thus, the bidirectional active driving force for the thread trimming device of the rotary hook box is realized as a whole, and the power attenuation problem caused by the traditional unidirectional driving is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described below in conjunction with the accompanying drawings:

[0012] Figure 1 It is a three-dimensional structural schematic diagram of a bidirectionally driven thread trimming device for an embroidery machine of the utility model;

[0013] Figure 2 It is a three-dimensional structural diagram of a bidirectionally driven thread trimming device for an embroidery machine after the support in the utility model is hidden;

[0014] Figure 3 This is a schematic diagram of the three-dimensional installation structure of the connecting rod driving device driving the thread trimming device in the utility model;

[0015] Figure 4 This is a schematic diagram of the installation structure of the thread trimming device in the utility model. Specific implementation plan

[0016] The following is combined with Figure 1-4 The specific implementation method further describes the technical solution of this patent in detail.

[0017] A bidirectionally driven thread trimming device for an embroidery machine comprises more than two rotary hook boxes for the embroidery machine, the rotary hook boxes being mounted on a bracket 5, a thread trimming device being mounted in the rotary hook boxes, the thread trimming device being driven by a thread trimming pull rod 3, a bidirectional driving device being mounted between the thread trimming devices of a first rotary hook box 7 and a second rotary hook box 6 adjacent to each other in the rotary hook boxes, the bidirectional driving device comprising a connecting seat 4 connected to the thread trimming pull rod 3, the connecting seat 4 being connected to a connecting rod driving device via a guide rail device.

[0018] As a preferred structure, the guide rail device includes a guide rail base 54 connected to the bracket 5, and the guide rail base 54 is installed with a horizontally arranged guide rail 14, and the guide rail 14 cooperates with the connected slider 13, one side of the slider 13 is connected to the connecting seat 4, and the other side is connected to the connecting rod driving device through the fixing pin 15. The slider 13 in the guide rail device drives the connecting seat 4 to move left and right, and the connecting seat 4 drives the thread trimming pull rod 3 to move left and right to realize the bidirectional driving performance of the thread trimming device of the first hook box 7 and the thread trimming device of the second hook box 6.

[0019] As a preferred structure, the connecting rod driving device includes a motor 1, which drives the main shaft 12 to rotate, and the main shaft 12 drives the swing arm 10 to swing to realize the left and right movement of the trimming connecting rod 9, and the trimming connecting rod 9 is connected to the slider 13. The connecting rod driving device realizes the left and right movement of the slider of the guide rail device through the swing of the trimming connecting rod.

[0020] As a preferred structure, the thread trimming device includes a cutter connecting rod 8 connected to the thread trimming pull rod 3, the cutter connecting rod 8 is connected to one end of the first connecting rod 16, the other end of the first connecting rod 16 is connected to one end of the second connecting rod 17, the other end of the second connecting rod 17 is connected to one end of the cutter rotating shaft 18, the other end of the cutter rotating shaft 18 is connected to a movable cutter 19, and the movable cutter 19 cooperates with the fixed cutter 2 installed on the hook box base 20. In order to further improve the running stability, the cutter connecting rod 8 is vertically connected to the thread trimming pull rod 3, and the cutter connecting rod 8 and the cutter rotating shaft 18 are parallel to each other.

[0021] The above describes in detail the preferred implementation of this patent, but this patent is not limited to the above implementation. Various changes can be made within the knowledge scope of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A bidirectionally driven thread trimming device for an embroidery machine, comprising two or more hook boxes for the embroidery machine, the hook boxes being mounted on a bracket (5), the thread trimming device being mounted in the hook boxes, the thread trimming device being driven by a thread trimming pull rod (3), characterized in that: A bidirectional driving device is installed between the thread trimming device of the first rotary hook box (7) and the thread trimming device of the second rotary hook box (6) in the rotary hook box, and the bidirectional driving device includes a connecting seat (4) connected to the thread trimming pull rod (3), the connecting seat (4) is connected to the connecting rod driving device through a guide rail device, the guide rail device drives the connecting seat (4) to move left and right, and the connecting rod driving device realizes the left and right movement of the slider of the guide rail device through the swing of the thread trimming connecting rod.

2. The bidirectionally driven thread trimming device for an embroidery machine according to claim 1, characterized in that: The guide rail device comprises a guide rail base (54) connected to a bracket (5), the guide rail base (54) being mounted with a horizontally arranged guide rail (14), the guide rail (14) being cooperatively connected to a slider (13), one side of the slider (13) being connected to a connecting seat (4), and the other side being connected to a connecting rod driving device via a fixing pin (15).

3. The bidirectionally driven thread trimming device for an embroidery machine according to claim 1, characterized in that: The connecting rod driving device comprises a motor (1), the motor (1) drives the main shaft (12) to rotate, the main shaft (12) drives the swing arm (10) to swing to achieve the left and right movement of the thread trimming connecting rod (9), and the thread trimming connecting rod (9) is connected to the slider (13).

4. The bidirectionally driven thread trimming device for an embroidery machine according to claim 1, characterized in that: The thread cutting device comprises a cutter connecting rod (8) connected to a thread cutting rod (3), the cutter connecting rod (8) being connected to one end of a first connecting rod (16), the other end of the first connecting rod (16) being connected to one end of a second connecting rod (17), the other end of the second connecting rod (17) being connected to one end of a cutter rotating shaft (18), the other end of the cutter rotating shaft (18) being connected to a movable cutter (19), the movable cutter (19) being matched with a fixed cutter (2) mounted on a hook box base (20).

5. The bidirectionally driven thread trimming device for an embroidery machine according to claim 4, characterized in that: The cutter connecting rod (8) is vertically connected to the thread trimmer pull rod (3), and the cutter connecting rod (8) and the cutter rotating shaft (18) are parallel to each other.

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