Thread-tying and thread-releasing structure of a sewing machine

Abstract

The invention provides a thread-tying and thread-releasing structure of a sewing machine, which belongs to the technical field of sewing equipment. It solves the technical problems of the existing loose-wire structure with too many connecting parts, insufficient stability and reliability, and the like. The sewing machine includes a casing and a thread clamp assembly. The thread loosening structure includes a support frame and a thread release plate. The thread release plate has thread loosening lugs corresponding to the thread clamp assembly. There is a thread loosening crank, and the casing is provided with a two-way driving part, and the two-way driving part has a driving rod that can move in both directions. It is in contact with one end of the driving rod, and the other end of the loosening crank is connected with the wire frame; the loosening crank also has a pusher that can drive the moving of the loosening plate; the other end of the driving rod is in contact with the loosening plate and can Push the thread release plate to move. The wire punching and loosening structure in the present invention realizes the double loosening function, reduces connecting parts at the same time, is easy to install, and works stably.

Description

technical field [0001] The invention belongs to the technical field of sewing equipment, and relates to a thread-tying and thread-releasing structure of a sewing machine. Background technique [0002] Many existing sewing machines are equipped with an automatic thread trimming mechanism. When the sewing machine is performing automatic thread trimming, in order to ensure that the suture can be cut smoothly and prevent the sewing machine from taking off the thread when it starts to sew again, it is generally necessary to loosen the thread while trimming the thread. Wire. At the end of sewing, in order to take out the sewing cloth conveniently, the sewing machine needs to have the action of lifting the presser foot to loosen the thread. But, the sewing machine with automatic thread trimming function in the market has thread loosening function when thread trimming, and does not have thread loosening function when lifting presser foot. Since the traditional common sewing machin...

AI Technical Summary

Problems solved by technology

[0004] The existing sewing machine thread loosening mechanism generally has defects such as complex structure, large number of parts, troublesome installation, etc.

The double loosening mechanism in the above-mentioned patent documents adopts a rope-pull structure, and is driven by the driving source of the thread trimmer and the driving source of the presser foot, and then drives the tightening and releasing of the wire rope through a series of transmission parts to complete the wire bonding. The wire loosening action is very cumbersome to install, and the steel wire rope will increase a lot of resistance when there are many turns, and there will be action delays, jamming, etc.

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