Thread trimming mechanism and sewing machine

Abstract

The present invention provides a thread cutting mechanism and a sewing machine. The thread cutting mechanism includes a fixed knife with a fixed knife edge, a moving knife with a moving knife edge, and a thread cutting knife seat. Both the fixed knife and the moving knife can be It is movably installed on the thread cutter seat, the fixed knife and the movable knife can move together towards or away from the needle of the sewing machine, and the movable knife can move towards or away from the needle of the sewing machine relative to the fixed knife, The moving knife has a hooking portion on the side of the moving knife edge away from the machine needle. In the present application, the fixed knife or the cutting knife is designed to be movable, so that the occlusal position of the moving knife blade and the fixed knife blade, or the thread cutting head on the cutting knife is closer to the machine needle during thread trimming, that is, the present application can Thread trimming is performed at a position closer to the center of the needle, so as to ensure that the thread ends remaining on the sewing material after thread trimming are shorter, and the thread trimming effect of short thread ends is achieved.

Description

technical field [0001] The invention relates to a thread cutting mechanism. [0002] The present invention also relates to a sewing machine comprising the above-mentioned thread trimming mechanism. Background technique [0003] At present, all sewing machines are equipped with a thread trimming mechanism, which is used to cut off the suture (comprising upper thread and bottom thread) after sewing. Such as figure 1 As shown, the existing thread trimming mechanism includes a moving knife 100 and a fixed knife 200 arranged oppositely, and the moving knife 100 and the fixed knife 200 are all arranged below the needle plate 300 in the sewing machine and above the rotary shuttle 400 in the sewing machine, wherein, The fixed knife 200 is fixed on the base of the sewing machine, and the movable knife 100 can rotate around the lower shaft of the sewing machine under the action of the driving assembly. When the thread is trimmed after sewing, the driving assembly drives the movable...

AI Technical Summary

Problems solved by technology

Although the above method can solve the problem of sewing bird’s nest, it will affect the operating space after installing a sliding thread clamping device on the machine head, the presser foot with the blade is not universal, the thick upper thread blade will not cut continuously, and the cut upper thread end needs to be sucked. There are a series of problems such as wind collection and treatment, air suction required for air source, upper thread thread remaining on the front of the sewing material due to the cutting of the presser foot, and affecting the appearance of the sewing material.

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