Thread cutting device for column type sewing machine

Abstract

The invention provides a thread cutting device for a column type sewing machine. The thread cutting device is assembled on a side seat with a needle hole and is mainly composed of a cutter group, a transmission device and a lower shaft. A fixed cutter of the cutter group is located behind the needle hole while a movable cutter of the cutter group is assembled on the side seat, wherein the transmission device is assembled on the movable cutter and can drive the movable cutter to swing around the axis of rotation parallel to a lower axis from a thread hooking position on one side of the needle hole to a cutting position where a thread is cut. In this way, since the fixed cutter is located behind the needle hole and the movable cutter can swing back and forth between the thread hooking position of and the cutting position around the axis of rotation, a short length of thread is remained on the surface of a sewn product when the movable cutter cuts the thread at the cutting position.

Description

technical field [0001] The invention relates to a thread cutting device of a column type sewing machine, in particular to a thread cutting device which can leave a relatively short thread end on a sewing object after cutting the thread. Background technique [0002] The sewing machine is mainly to combine several layers of sewing materials with each other through sewing, and, with the continuous evolution of technology, there are many types of sewing machines on the market, and different styles of sewing machines can be applied to different cars. The sewing operation of sewing thing, wherein, existing a kind of column type sewing machine that is applicable to sewing shoes, bag shape thing or cylindrical thing on the market at present. [0003] However, when the post-type sewing machine is finished sewing, in order to cut off the sutures conveniently, an existing thread cutting device 1 for cutting off the sutures will be set on the post-type sewing machine, please refer to ...

AI Technical Summary

Problems solved by technology

[0004] However, since both the fixed knife 10 and the movable knife 11 are arranged on the hook seat 12, the blade edges of the fixed knife 10 and the movable knife 11 are far away from the pinhole, so that the movable knife 11. When the suture is cut off, there will be a longer length of thread remaining on the surface of the sewing object, so that even if the suture is cut off by the movable knife 11, it is still necessary to manually cut the longer length of the thread in some applications. short

[0005] In view of the aforementioned shortcomings of the thread trimming device currently used in cylindrical sewing machines, it is necessary to innovate and improve the thread trimming device so that after the thread trimming device cuts off the suture, a relatively short thread end remains on the surface of the sewing object

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