A sewing machine thread take-up mechanism

Abstract

The invention provides a thread take-up mechanism of a sewing machine, which includes a thread-passing member fixed to the sewing machine casing and a thread-taking lever with a thread-taking portion that can swing up and down. The thread-passing member has two thread-passing arms arranged opposite to each other. Each thread-passing arm is provided with a thread-passing hole, and the thread-taking part of the thread-taking lever is located between the two thread-passing arms, and a thread-passing slot connected with the thread-passing hole is opened on the thread-taking part, and the thread-passing slot There is a thread take-up surface on the wall of the groove, and the thread-passing groove has a thread-taking head end and a thread-taking end; when the sewing machine needle goes up to the high point of the needle, the needle thread passing through the thread-passing groove is located at the pick-up point of the thread-passing groove. At the end of the thread, and the take-up amount of the needle thread is X, the take-up amount X of the needle thread also tightens the loop of the needle when sewing thin materials and heavy materials. Therefore, the present application realizes perfect sewing stitches, can be well adapted to thin and thick materials, and greatly improves sewing quality.

Description

technical field [0001] The invention relates to a sewing machine, in particular to a sewing machine thread take-up mechanism for an overlock sewing machine. Background technique [0002] The overlock sewing machine is a kind of sewing machine, mainly used for hemming; at present, the more common overlock sewing machine model is the two-needle four-thread model, that is: the overlock sewing machine has two machine needles and two looper needles, The two machine needles are respectively the left machine needle and the right machine needle, and the two loopers are respectively the upper looper and the lower looper. At the same time, the overlock sewing machine is also equipped with an organic needle thread take-up mechanism, which realizes the take-up of the needle thread by matching the thread supply and take-up of each needle. During the thread take-up process, the amount of thread take-up at each moment presents a parabolic trajectory. However, there is a common defect in t...

AI Technical Summary

Problems solved by technology

However, there is a common defect in the current machine needle thread take-up mechanism: it cannot be well adapted to thin and thick materials at the same time, that is, when sewing thin and thick materials with different fabric thicknesses, the stability of the needle thread cannot be achieved. Take-up; if the take-up amount of the needle thread is sufficient for thin materials, the phenomenon that the needle thread cannot be tightened when sewing thick materials; The needle thread is too tight, and the thin material is wrinkled

Therefore, the above-mentioned machine needle thread take-up mechanism cannot be well adapted to thin materials and thick materials at the same time, it cannot form smooth and excellent sewing stitches, and the sewing quality is poor

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