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Title:
SEWING MACHINE HAVING IMPROVED AUTOMATIC THREAD CUTTING MECHANISM
Document Type and Number:
WIPO Patent Application WO/2018/126331
Kind Code:
A1
Abstract:
A sewing machine having an improved automatic thread cutting mechanism. An outward-facing side of a stitching arm is determined as a left side. A rotary hook transmission shaft (5) and a cutting blade drive shaft (2) are rotatably installed in an inner portion of the stitching arm. The cutting blade drive shaft (2) is sleeved over the rotary hook transmission shaft (5). A rotary hook base for accommodating a rotary hook is provided at an upper portion of the rotary hook transmission shaft (5). An upper plate of a fixed stitching cover (3) is provided with a needle plate (33). A fixed blade (4) is fixed to a lower face of the needle plate (33). A cutting blade movement space is provided below the needle plate (33), and is located between a side wall of the fixed stitching cover (3) and the cutting blade drive shaft (2). A sweep cutting blade (1) is fixed to the cutting blade drive shaft (2), and is provided at the cutting blade movement space. A blade member (11) is provided at an upper portion of the sweep cutting blade (1). In a thread cutting process, the sweep cutting blade (1) performs one to-and-fro movement in the cutting blade movement space below the fixed stitching cover (3). The blade member (11) of the sweep cutting blade (1) cooperates with the fixed blade (4) to perform a cutting operation. The present invention enables a simple structure, and a compact size of the stitching arm, thus providing superior flexibility and convenience during a sewing process. In addition, the sweep cutting blade (1) has high structural strength, provides a large cutting force, and enables smooth, stable, and reliable thread cutting, thus facilitating thread cutting operation.

Inventors:
XIAO, Xiufeng (Dongguan Feiyue Machinery Co. Ltd, Chongkou Village Houjie Tow, Dongguan Guangdong 0, 523000, CN)
Application Number:
CN2017/000008
Publication Date:
July 12, 2018
Filing Date:
January 03, 2017
Export Citation:
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Assignee:
XIAO, Xiufeng (Dongguan Feiyue Machinery Co. Ltd, Chongkou Village Houjie Tow, Dongguan Guangdong 0, 523000, CN)
International Classes:
D05B65/02
Foreign References:
CN101845722A2010-09-29
CN1483884A2004-03-24
CN102505371A2012-06-20
CN101634087A2010-01-27
US4165700A1979-08-28
CN101634086A2010-01-27
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