CN202705688U - Sewing machine automatic trimming device - Google Patents

Abstract

The utility model provides a sewing machine automatic trimming device, and belongs to the technical field of sewing machines. The sewing machine automatic trimming device resolves the problems that the needle collision phenomenon in the prior art enables work to be incoherent and affects production efficiency and the like. The sewing machine automatic trimming device comprises a moving knife, a static knife, a connection rod and a trimming electromagnet, wherein the moving knife, the static knife, the connection rod and the trimming electromagnet can be matched with one another for trimming, the static knife is fixed on a machine base of a sewing machine, and one ends of the moving knife and the connection rod are fixed on a trimming knife frame. The trimming knife frame is arranged on a lower shaft in sleeved mode, the other end of the connection rod is hinged with one end of a transmission rod, and the other end of the transmission rod is connected with moving iron of the trimming electromagnet. A feed lifting rock shaft is provided with a trimming cam which is placed on one side of the transmission rod, and a round pin which is matched with the trimming cam to drive the transmission rod to move is fixed on the transmission rod. The sewing machine automatic trimming device has the advantages of being high in trimming accuracy, simple and convenient to operate, simple in structure and the like.

Description

Automatic thread trimmer for sewing machine

technical field

The utility model belongs to the technical field of sewing machines, in particular to an automatic thread trimmer for sewing machines. the

Background technique

Along with the development of sewing machine technology day by day, the sewing machine with automatic thread trimming function is deeply loved by sewing industry manufacturers because it reduces the workload and ensures the continuity of the process. the

At present, the automatic thread trimming device of the sewing machine usually cuts the thread through the cooperation of the moving knife and the fixed knife. The first is to drive the moving knife through the lower shaft. In this structure, because the speed of the lower shaft is different from that of the upper shaft, a forced reset mechanism is set for adjustment, but there is still a certain probability of the pin hitting phenomenon. At the same time, the mechanism parts are increased and the cost is increased. , which also increases the noise. the

Contents of the invention

The purpose of the utility model is to provide an automatic thread-cutting device with high thread-cutting precision and avoiding the needle-hitting phenomenon of a sewing machine. the

The purpose of this utility model is achieved like this: the sewing machine automatic thread trimming device includes a movable knife, a fixed knife, a connecting rod and a thread trimming electromagnet that can cooperate with each other to cut the thread, and the fixed knife is fixed on the sewing machine base, and It is characterized in that: the moving knife and one end of the connecting rod are fixed on the thread trimmer holder, the thread cutter holder is set on the lower shaft, the other end of the connecting rod is hinged with one end of the transmission rod, and the other end of the transmission rod is connected with the wire trimmer. The moving iron connection of the electromagnet, the thread-cutting cam is installed on the tooth lifting shaft, the thread-cutting cam is located on one side of the transmission rod, the transmission rod is fixed with a roller that cooperates with the thread-cutting cam to drive the transmission rod to move, the thread-cutting electromagnet After the action drives the movable knife to be in the state of thread trimming, the rotation of the thread trimming cam drives the movable knife to rotate through the roller, and the rotation of the movable knife cooperates with the fixed knife to trim the thread. the

The working principle of the utility model is: utilizing the phenomenon of the same rotating speed of the tooth lifting shaft and the upper shaft, when the machine needle reciprocates once and returns to the raised needle position, the tooth lifting shaft rotates one week and the thread trimming cam drives the moving knife to rotate, Cooperate with the fixed knife to complete the thread trimming process. In the actual use process, when the user issues a thread trimming command or the sewing is completed, the action of the thread trimming electromagnet drives the moving knife to be in the state of thread trimming, even if the roller is in the position where it can be trimmed. At the position where the cams collide with each other, after the thread trimming process is completed, the thread trimming electromagnet drives the moving knife to reset. This thread trimming device has high thread trimming accuracy, avoids the phenomenon of needle hitting, and has a wide range of applications. the

In the above-mentioned automatic thread trimming device for sewing machines, the transmission rod is arranged below the tooth lifting shaft. the

In the above-mentioned automatic thread trimming device for sewing machines, the specific structure that the other end of the transmission rod is connected to the moving iron of the thread trimming electromagnet is: the transmission rod and the moving iron of the thread cutting electromagnet are arranged in parallel, and the other end of the transmission rod is vertical A connecting pin is connected, and the connecting pin is fixedly connected with the outer end of the moving iron through the connecting plate. the

Compared with the prior art, the utility model has outstanding and beneficial technical effects as follows:

1. The tooth lifting shaft of the utility model is provided with a thread trimming cam which cooperates with the roller impact block on the transmission rod to drive the thread trimming tool holder. The speed of the tooth lifting shaft and the main shaft is the same, so when the needle is lifted At the same time, the moving knife on the thread trimming tool holder cooperates with the fixed knife to trim the thread, which avoids the phenomenon of needle hitting, makes the working process smooth, improves the thread trimming accuracy and ensures the production efficiency. the

2. The utility model is simple in structure and novel in design. the

Description of drawings

Fig. 1 is the structural representation of the utility model. the

Fig. 2 is a schematic structural view of the utility model. the

Fig. 3 is a schematic structural view of the utility model. the

Detailed ways

The utility model is further described below in conjunction with accompanying drawing with specific embodiment, referring to Fig. 1-3:

The sewing machine automatic thread trimming device includes a moving knife 1, a fixed knife 2, a connecting rod 3 and a thread trimming electromagnet that can cooperate with each other to cut the thread. The fixed knife 2 is fixed on the sewing machine base, and the moving knife 1 and One end of the connecting rod 3 is fixed on the thread-cutting tool frame 4, and the thread-cutting tool frame 4 is set on the lower shaft 5, the other end of the connecting rod 3 is hinged with one end of the transmission rod 6, and the other end of the transmission rod 6 is connected with the thread-cutting electromagnet The moving iron 11 is connected, and the thread-cutting cam 8 is installed on the tooth lifting shaft 7. The thread-cutting cam is located on one side of the transmission rod 6, and the transmission rod 6 is fixed with a roller 9 that cooperates with the thread-cutting cam to drive the transmission rod 6 to move. After the action of the thread trimming electromagnet 10 drives the moving knife 1 to be in the thread-cutting state, the rotation of the thread-cutting cam 8 drives the moving knife 1 to rotate through the roller 9, and the moving knife 1 rotates to cooperate with the fixed knife 2 to trim the thread. The working principle of the utility model is: the phenomenon of the same rotational speed of the tooth-lifting shaft 7 and the upper shaft of the sewing machine is utilized. The movable knife 1 rotates and cooperates with the fixed knife 2 to complete the thread trimming process. In the actual use process, when the user issues a thread trimming command or the sewing is completed, the action of the thread trimming electromagnet 10 drives the movable knife 1 to be in the thread trimming state. That is, the roller 9 is located at a position where it can collide with the thread trimming cam 8. After the thread trimming process is completed, the thread trimming electromagnet 10 drives the movable knife 1 to reset. wide range. the

The above-mentioned transmission rod 6 is arranged below the tooth lifting shaft 5 . There are many structural parts of the sewing machine base, so considering the space rationality of the structural design, it is more appropriate to arrange the transmission rod 6 under the tooth lifting shaft 5, and the installation position satisfies the requirement that the cam 8 rotates and can hit the roller 9. the

The specific structure that the other end of the above-mentioned transmission rod 6 is connected with the moving iron 11 of the wire-cutting electromagnet is: the transmission rod 6 is arranged in parallel with the moving iron 11 of the wire-cutting electromagnet, and the other end of the transmission rod 6 is vertically connected with a connecting pin 12 , the connecting pin and the outer end of the moving iron are fixedly connected through the connecting plate 13 . The moving iron 11 of the thread-cutting electromagnet is integrally formed with the thread-cutting electromagnet inner core. the

The foregoing embodiments are only preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Therefore: all equivalent changes made according to the structure, shape, and principle of the present utility model should be covered by this utility model. within the scope of protection of utility models. the

Claims (3)

1. automatic thread severing device of sewing machine, the moving knife (1) that comprising to cooperatively interact cuts off line, stationary knife (2), connecting rod (3) and trimming electromagnet, described stationary knife (2) is fixed on the Sewing machines support, it is characterized in that: an end of described moving knife (1) and connecting rod (3) is fixed on the trimming knife rest (4), trimming knife rest (4) is sleeved on the lower shaft (5), one end of the other end of connecting rod (3) and drive link (6) is hinged, the other end of drive link (6) is connected with the moving iron (11) of trimming electromagnet, lift trimming cam (8) is installed on the last item (7), the trimming cam is positioned at a side of drive link (6), be fixed with the roller (9) that cooperates drive drive link (6) to move with the trimming cam on the drive link (6), the action of trimming electromagnet (10) drives moving knife (1) and is in behind the trimming state, the rotation of trimming cam (8) drives moving knife (1) by roller (9) and rotates, and moving knife (1) rotates and cooperates trimming with stationary knife (2).

2. automatic thread severing device of sewing machine according to claim 1, it is characterized in that: described drive link (6) is located at the below of feed lifting rock shaft (5).

3. automatic thread severing device of sewing machine according to claim 1, it is characterized in that: the other end of described drive link (6) with the concrete structure that the moving iron (11) of trimming electromagnet is connected is: drive link (6) be arranged in parallel with the moving iron (11) of trimming electromagnet, the vertical connecting pin (12) that connects of the other end of drive link (6), connecting pin is fixedly connected with by connecting plate (13) with the outer end of moving iron.

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