Semi-rotating kettle device of sewing machine

Abstract

The invention provides a caracol kettle apparatus of sewing machine capable of reliably prevent generating wire jumper or yarn break or fluff of an upper wire loop by preventing separation of sewing needle and point. The caracol kettle apparatus has: a sewing needle (12) forming the upper wire loop (13a) with sewing string (13); a middle kettle (3) for capturing point 3c of the upper wire loop (13a) through rotating action; and a driver (5) of activating the middle kettle to rotate to-and-fro, the driver (5) has a rear-side support section (5e) of the needle, which supports a back surface of the sewing needle (12) opposite to the point (3c); and a front-side support section (5f) of the needle, which supports a front surface of the sewing needle (12).

Description

technical field [0001] The invention relates to a semi-rotary kettle device of a sewing machine, which has a drive for reciprocating rotation of the middle kettle. Background technique [0002] At present, there is known a sewing machine with a semi-rotary kettle, which utilizes the tip of the rotating middle kettle to catch the upper thread loop of the suture thread formed by the sewing needle and make it interlaced with the lower thread to sew. [0003] For example, the existing semi-rotary kettle disclosed in Patent Document 1, such as Image 6 As shown, the middle kettle 17 is rotatably held with respect to the substantially bowl-shaped large kettle 19 fixed on the sewing machine frame. The driver 18 coupled to the rotating lower shaft 20 performs a half-rotational swing. And it becomes the following structure: the driver 18 performs a semi-rotational swing, and the two free ends 18A, 18B of the driver 18 push the middle kettle 17, and make the middle kettle 17 perform ...

AI Technical Summary

Problems solved by technology

[0005] In this sewing machine, if the needle 22 vibrates or bends when the needle 22 rises after it reaches the bottom dead center, and the position of the front end of the needle 22 deviates to the side of the main body of the kettle (the side through which the tip passes), the needle 22 near the front end of the middle kettle 17 will be close to the tip 17a of the middle kettle 17, so the tip 17a cannot be reliably used to catch the upper thread loop 23a, but thread jumping occurs, or the tip 17a engages with the needle point of the sewing needle 22 and the tip is damaged, or the Broken needles, etc.

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