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Automatic cutting device of sewing machine

A sewing machine and thread trimming technology, applied in the field of sewing machines, can solve the problems of increasing mechanical parts, increasing costs, increasing noise, etc., and achieves the effects of ensuring production efficiency, improving thread trimming accuracy, and smooth working process

Inactive Publication Date: 2013-01-16
JACK SEWING MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 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

Method used

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  • Automatic cutting device of sewing machine

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing, the present invention will be further described with specific embodiment, see figure 1 —3:

[0017] The automatic thread trimming device for sewing machines 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 ...

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Abstract

The invention provides an automatic cutting device of a sewing machine and belongs to the technical field of sewing machines. The device can solve the problems of discontinuous operation, affected production efficiency and the like caused by the needle-bumping phenomenon in the prior art. The device comprises a moving knife, a fixing knife, a connecting rod and a cutting electromagnet, which cooperate with each other to cut threads, wherein the fixing knife is fixed on a base of the sewing machine, the moving knife and one end of the connecting rod are fixed on a cutting knife holder, the cutting knife holder is sleeved on a lower shaft, the other end of the connecting rod is hinged with one end of a transmission rod, and the other end of the transmission rod is connected with a moving iron of the cutting electromagnet; and a feed lifting rock shaft is provided with a cutting cam, the cutting cam is positioned on the side of the transmission rod, and the transmission rod is fixedly provided with a cylindrical pin which is matched with the cutting cam to drive the transmission rod to move. The device provided by the invention has the advantages of high cutting accuracy, convenience in operation, simple structure and the like.

Description

technical field [0001] The invention belongs to the technical field of sewing machines, in particular to an automatic thread trimmer for sewing machines. Background technique [0002] 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. [0003] 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D05B65/02
Inventor 祝书伟应振华李创
Owner JACK SEWING MASCH CO LTD
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